SYSTEM AND METHOD FOR CHANNEL MEASUREMENT AND WIRELESS INTERFERENCE MEASUREMENT

专利摘要:
a method of modality, by means of a user equipment (eu), includes performing a channel measurement (cm) on a first subset of a set of reference signal resources csi (csi-rs) of non-zero power ( nzp) and an interference measurement (im) on at least a second subset of the nzp csi-rs feature set. the second subset includes one or more nzp csi-rs ports. the im is executed according to assumptions: each nzp csi-rs port in the second subset corresponds to an interference transmission layer, the im according to a set of energy ratios per resource element, each associated with a resource nzp csi-rs in the second subset; and another interference not associated with the interference transmission layers is in the first and second subsets. the method includes generating a channel status information (csi) report based on cm and im and transmitting the csi report to a network.
公开号:BR112019007177A2
申请号:R112019007177-6
申请日:2018-11-16
公开日:2020-05-26
发明作者:Liu Jialing；Xiao Weimin；Cheng Qian；Zhang Ruiqi
申请人:Huawei Technologies Co., Ltd.；
IPC主号:

专利说明:

SYSTEM AND METHOD FOR CHANNEL MEASUREMENT AND WIRELESS INTERFERENCE MEASUREMENT
RELATED REQUESTS
[001] This application claims the benefit of provisional application US 62 / 588,176, filed on November 17, 2017, and provisional application US 62 / 670,464, filed on May 11, 2018, whose applications are incorporated into this document by reference .
TECHNICAL FIELD
[002] This disclosure concerns systems and methods for wireless communications, and, in particular modalities, a system and method for measuring the channel in a wireless network. BACKGROUND
[003] Wireless communication systems include long term evolution systems (LTE), LTE-A, LTE-A further on, LTE 5G, New Radio (NR) 5G, etc. A modern wireless communications system can include a plurality of NodeBs (NBs), which can also be referred to as base stations, network nodes, communications controllers, cells or enhanced NBs (eNBs) and so on. A NodeB can include one or more network points or network nodes using different radio access technologies (RATs) such as high speed packet access (HSPA) NBs or WiFi access points. A NodeB can be associated with a single network point or with multiple network points. A cell can include a single network point or multiple network points, and each network point can have a single antenna or multiple antennas. A network point can correspond to multiple cells operating on multiple component carriers.
[004] An eNB can be interconnected with another eNB by
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2/179 via an X2 interface. An eNB can also be connected via an SI interface to a Mobility Management Entity (MME) and a Server Communication Port (S-GW). In addition, a cell or NodeB can serve multiple users (also commonly referred to as User Equipment (UE), mobile stations, terminals, devices and so on) over a period of time. Network resources include a point, network point, transmission point (TP), transmit-receive point (TRP), node, network node, etc., to serve the UE. Such network resources can be physically distributed or located, and in one location there may be one or more sets of such resources (for example, one or more network points). A network resource can act as a virtualized cell for a UE. The network or the UE can have multiple layers. In general, Layer 1 is the physical layer (PHY), Layer 2 is the media access control layer (MAC), Layer 3 is the RRC layer, etc.
[005] Generally speaking, in orthogonal frequency division (OFDM) multiplexing systems, the system's frequency bandwidth is divided into multiple subcarriers in the frequency domain. In the time domain, a subframe is divided into multiple OFDM symbols. The OFDM symbol can have a cyclic prefix to avoid interference between symbols caused by multiple path delays. A resource element (RE) is defined by the time / frequency resource within a subcarrier and an OFDM symbol. In a downlink transmission, reference signals (RSs) and other signals such as a data channel (for example, a physical channel
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3/179 shared downlink (PDSCH)), a control channel (for example, a physical downlink control channel (PDCCH)) and an enhanced PDCCH (EPDCCH) are orthogonal and multiplexed in different time domain REs /frequency. In an uplink transmission, the physical uplink shared channel (PUSCH) and the physical uplink control channel (PUCCH) are orthogonal and multiplexed in different time / frequency resources. A set of REs is grouped together to form a resource block (RB). For example, 12 subcarriers in a time frame constitute an RB.
[006] In general, to provide any data channels in uplink (UL) or downlink (DL) transmissions such as PDSCH or PUSCH from an LTE-A system, reference signals are transmitted. There are reference signals for an UE to perform channel / signal estimation / measurements for demodulation of PDCCH and other common channels as well as for some measurements and feedback, which is the Common / Cell Specific Reference Signal (CRS) inherited from the Release 8/9 of the Evolved Universal Terrestrial Radio Access (E-UTRA) specification. A Demodulation / Dedicated Reference Signal (DMRS) can be transmitted together with the PDSCH channel in E-UTRA Release 10. DMRS is used for channel estimation during PDSCH demodulation. In Release 10, the Channel State Information Reference Signal (CSI-RS) is introduced in addition to CRS and DMRS. CSI-RS is used for Release 10 UEs to measure channel status, especially for cases of multiple antennas. PMI / CQI / RI and other feedback information can be based on the
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4/179 measurement of CSI-RS for Release 10 and UEs later. PMI is the pre-coding matrix indicator, CQI is the channel quality indicator, and RI is the pre-coding matrix rating indicator. CSI-RS in Release 10 can support up to 8 transmission antennas while CRS can support up to 4 transmission antennas in Release 8/9. The number of CSI-RS antenna ports can be 1, 2, 4 or 8. Furthermore, to support the same number of antenna ports, CSI-RS has less overhead because of its low density in time and frequency .
[007] A heterogeneous network (HetNet) comprises high power macro points and several lower power points that in general can share the same communication resources. The lowest power points may include, but are not limited to, peaks, micros, remote radio units (RRHs), femtos (or residence eNBs (HeNBs)), access points (APs), distributed antennas (DAs ), retransmissions and near field communication points.
[008] A network can also comprise several component carriers operating in different frequency bands. High frequency bands in general have a high path loss with distance and thus they are better suited to serve a relatively smaller area, such as being used for high transfer rate purposes for nearby UEs. Low frequency bands in general have low path loss over distance and thus they are better suited to serve a relatively large area, such as being used to provide coverage.
SUMMARY
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[009] According to one aspect of this disclosure, a method, by means of a user equipment (UE) for wireless communications, includes performing a channel measurement associated with a channel status information report (CSI) on a first subset of a set of non-zero power (NZP) reference signal CSI (CSI-RS) (NZP CSI-RS). The method includes additionally performing an interference measurement associated with the CSI report on at least a second subset of the NZP CSI-RS feature set. The second subset of the NZP CSI-RS feature set includes one or more NZP CSI-RS ports. The interference measurement is performed according to assumptions comprising: each NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds to an interference transmission layer, the interference measurement being according to a set of energy ratios per resource element (EPRE), each associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set; and another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS resource set is in the first subset of the NZP CSI-RS resource set and the second subset of the set NZP CSI-RS resources. The method additionally includes generating the CSI report based on channel measurement and interference measurement and transmitting the CSI report to a network.
[010] Optionally, in any of the previous aspects, the CSI report includes at least one channel quality indicator (CQI), but not a matrix indicator
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6/179 pre-coding (PMI).
[Oil] Optionally, in any of the foregoing, each EPRE ratio in the EPRE ratio set where each is associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set specifies an assumed ratio of one Downlink shared physical channel EPRE (PDSCH) for an EPRE of an NZP CSI-RS signal on the NZP CSI-RS resource.
[012] Optionally, in any of the previous aspects, the method additionally includes receiving a configuration of a set of features for measuring CSI interference (CSI-IM) and the assumptions according to which the interference measurement is performed additionally include that another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds is in the feature set for CSI-IM.
[013] Optionally, in any of the previous aspects, the method additionally includes receiving a measurement restriction configuration associated with channel measurement.
[014] Optionally, in any of the previous aspects, the method additionally includes receiving a measurement restriction configuration associated with interference measurement.
[015] Optionally, in any of the previous aspects, the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources overlap.
[016] Optionally, in any of the previous aspects, the method additionally includes receiving, by the UE,
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7/179 of a network node, an indication of the NZP CSI-RS feature set for channel measurement and interference measurement. The indication indicates the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources.
[017] Optionally, in any of the previous aspects, the network node includes a NodeB, an evolved NodeB (eNB) or a next generation NodeB (gNB).
[018] Optionally, in any of the previous aspects, the UE receives from the network node the indication of the first subset of NZP CSI-RS resources and of the second subset of NZP CSI-RS resources through downlink control information ( DCI).
[019] Optionally, in any of the previous aspects, the UE receives from the network node the indication of the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources through a combination of information control. downlink (DCI) and media access control (MAC) signaling.
[020] Optionally, in any of the previous aspects, DCI provides a dynamic activation of one or more CSI reporting configurations.
[021] According to another aspect of this disclosure, a device (for example, user equipment (UE)) includes one or more processors and a non-transient, computer-readable storage medium storing programming for execution by one or more processors, and the schedule includes instructions for executing the method in any of the above.
[022] According to another aspect of this disclosure, a non-transitory storage medium readable by
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8/179 computer stores programming for execution by one or more processors, the programming including instructions for executing the method in any of the previous aspects.
[023] In accordance with another aspect of this disclosure, an apparatus (eg, user equipment (UE)) for wireless communication includes a device for performing a channel measurement associated with a channel status information report (CSI) ) in a first subset of a set of non-zero power (NZP) reference signal CSI (CSI-RS) (NZP CSI-RS). The device additionally includes a device for performing an interference measurement associated with the CSI report on at least a second subset of the NZP CSI-RS feature set. The second subset of the NZP CSI-RS feature set includes one or more NZP CSI-RS ports. The interference measurement performed according to assumptions comprising: each NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds to an interference transmission layer, the interference measurement being according to a set of reasons energy per resource element (EPRE), each associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set; and another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS resource set is in the first subset of the NZP CSI-RS resource set and the second subset of the set NZP CSI-RS resources. The device additionally includes a device to generate the CSI report based on channel measurement and interference measurement and
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9/179 device to transmit the CSI report to a network.
[024] According to another aspect of this disclosure, a method, by means of a network node for wireless communications, includes indicating, by the network node for a user equipment (UE), a set of signal resources of non-zero power (NZP) channel status information (CSI-RS) reference (NZP CSI-RS) for channel measurement and interference measurement. A first subset of the NZP CSI-RS feature set is configured for channel measurement, and a second subset of the NZP CSI-RS feature set is configured for interference measurement. The method additionally includes receiving, by the network node, a CSI report from the UE. The CSI report is based on channel measurement and interference measurement, channel measurement having been performed by the UE on the first subset of the NZP CSI-RS feature set and interference measurement having been performed by the UE on the second subset of the set of NZP CSI-RS resources and according to assumptions comprising that: each NZP CSI-RS port in the second subset of the NZP CSI-RS resource set corresponds to an interference transmission layer, the interference measurement being according to a set energy ratios per resource element (EPRE), each associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set; and another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS resource set is in the first subset of the NZP CSI-RS resource set and the second subset of the set NZP CSI-RS resources.
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[025] Optionally, in any one of the aspects previous reports, the report CSI includes at one less indicator in channel quality (CQI), but not one indicator matrix in pre-coding (PMI) • [026] Optionally, in any one of the aspects previous, each reason IT'S PRE in the set reason s EPRE at
that each is associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set specifies an assumed ratio of a downlink shared physical channel EPRE (PDSCH) to an EPRE of an NZP CSI-RS signal in the NZP CSI-RS resource.
[027] Optionally, in any of the previous aspects, the method additionally includes indicating, by the network node for the UE, a configuration of a set of resources for measuring CSI interference (CSI-IM) and the assumptions according to which interference measurement is performed further comprise that another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds is in the feature set for CSI-IM .
[028] Optionally, in any of the previous aspects, the method additionally includes indicating, by the network node to the UE, a measurement restriction configuration associated with channel measurement.
[029] Optionally, in any of the previous aspects, the method additionally includes indicating, by the network node to the UE, a measurement restriction configuration associated with interference measurement.
[030] Optionally, in any aspect
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11/179, the network node comprises a NodeB, an evolved NodeB (eNB) or a next generation NodeB (gNB).
[031] Optionally, in any of the previous aspects, the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources overlap.
[032] Optionally, in any of the previous aspects, the network node indicates to the UE the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources by means of downlink control information (DCI) ).
[033] Optionally, in any of the previous aspects, the network node indicates to the UE the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources through a combination of link control information descending (DCI) and media access control (MAC) signaling.
[034] Optionally, in any of the previous aspects, DCI provides dynamic activation of one or more CSI reporting configurations.
[035] In accordance with another aspect of this disclosure, a device (for example, a network node), includes one or more processors and a computer-readable non-transitory storage media storing programming for execution by one or more processors, and the schedule includes instructions for executing the method in any of the previous aspects.
[036] According to another aspect of this disclosure, a computer-readable non-transitory storage media stores programming for execution by one or more processors, the programming including instructions for
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12/179 execute the method in any of the previous aspects.
[037] According to another aspect of this disclosure, a device (for example, a network node) for wireless communications includes a device to indicate, for a user device (UE), a set of reference signal resources ( Non-zero power (NZP) channel status information (CSI-RS) (NZP CSI-RS) for channel measurement and interference measurement. A first subset of the NZP CSI-RS feature set is configured for channel measurement, and a second subset of the NZP CSI-RS feature set is configured for interference measurement. The device additionally includes a device for receiving a CSI report from the UE. The CSI report is based on channel measurement and interference measurement, channel measurement having been performed by the UE on the first subset of the NZP CSI-RS feature set and interference measurement having been performed by the UE on the second subset of the set of NZP CSI-RS resources and according to assumptions comprising that: each NZP CSI-RS port in the second subset of the NZP CSI-RS resource set corresponds to an interference transmission layer, the interference measurement being according to a set energy ratios per resource element (EPRE), each associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set; and another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS resource set is in the first subset of the NZP CSI-RS resource set and the second subset of the set NZP CSI-RS resources.
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[038] Modalities of this disclosure may provide one or more technical advantages. In certain embodiments, configuring NZP CSI-RS features for interference measurement provides improved link adaptation performance. Certain modalities facilitate the use of a higher frequency spectrum. Certain modalities provide improved performance that is suitable for use with multiple input and multiple output (MIMO) and massive MIMO systems. Link adaptation according to certain modalities of this disclosure allows interference measurement capabilities at a time, n, to reflect interference from multiple users at a time n + k, with a channel measurement feature of a first UE being a interference measurement of a second UE, which can be advantageous in a multi-user MIMO system. Certain modalities can improve performance in a network limited by interference, in which the interference between cells is strong and / or with significant oscillation, carrier aggregation / channel aggregation, and in improving coverage.
[039] Certain modalities of the present disclosure may provide some, all or none of the previously mentioned advantages. Certain embodiments may provide one or more other technical advantages, one or more of which may be readily apparent to those skilled in the art from the figures, descriptions and claims included in this disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
[040] For a more complete understanding of this revelation, and the advantages of it, reference is now made to the descriptions below considered together with
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14/179 attached drawings, in which:
Figure 1 illustrates an example system for connecting or disconnecting a network point, according to certain modalities of this disclosure;
Figure 2 illustrates an example system with interference from an eNB to an existing relay, according to certain modalities of this disclosure;
Figure 3 illustrates a Transition Adjustment Process method, according to certain modalities of this disclosure;
Figure 4 illustrates a transition adjustment period timeline, according to certain modalities of this disclosure;
Figure 5 illustrates a transition adjustment period timeline, according to certain modalities of this disclosure;
Figure 6 illustrates state transitions for a point, according to certain modalities of this disclosure;
Figure 7 illustrates an example system diagram, according to certain modalities of this disclosure;
Figure 8 illustrates an example of a drilling operation, according to certain modalities of this disclosure;
Figure 9 illustrates a flow chart of EC operation, according to certain modalities of this disclosure;
Figure 10 illustrates an eNB operation flow chart, according to certain modalities of this disclosure;
Figure 11 illustrates a flow chart of EU operation, according to certain modalities of this disclosure;
Figure 12 illustrates an example of a link adaptation procedure based on sounding, according to certain modalities of this disclosure;
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Figure 13 illustrates an example of a probe for link adaptation, according to certain modalities of this disclosure;
Figure 14 illustrates a modality procedure for polling for link adaptation, according to certain modalities of this disclosure;
Figure 15 illustrates details of a survey procedure for link adaptation, according to certain modalities of this disclosure;
Figure 16 illustrates an example of Alt3 from an EU view, according to certain modalities of this disclosure;
Figure 17 illustrates an example of resources for CSI measurements with CSI-IM not covered by ZP CSI-RS resources of the adjacent eNBs, according to certain modalities of this disclosure;
Figure 18 illustrates an example of resources for CSI measurements with CSI-IM covered by ZP CSI-RS resources of the adjacent eNBs, according to certain modalities of this disclosure;
Figure 19 illustrates CSI measurements without CSI-IM and with CSI-RS overlap, according to certain modalities of this disclosure;
Figure 20 shows an example 2000 case for IM based on ZP CSI-RS, according to certain modalities of this disclosure;
Figure 21 illustrates an example of a UE that measures the energy / power in a RE ZP CSI-RS, according to certain modalities of this disclosure;
Figure 22 illustrates example 2200 in another scenario when IM is based on multiple signals of different power
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16/179 of zero (NZP) and is not overlaid with CMR, according to certain modalities of this disclosure;
Figure 23 illustrates a typical use case of the superimposed CSI-RS resource for channel and interference, according to certain modalities of this disclosure;
Figure 24 illustrates an example for a non-overlapping CSI-RS resource for measuring channel and interference, according to certain modalities of this disclosure;
Figure 25 illustrates an interference between cells with a non-overlapping CMR configuration and interference measurement (IM) feature (IMR), according to certain modalities of this disclosure;
Figure 26 illustrates another example configuration of a NZP CSI-RS resource set, according to certain modalities of this disclosure;
Figure 27 illustrates an example method in which a combination of UE behaviors is implemented, according to certain modalities of this disclosure;
Figure 28 illustrates an example method 2800 for wireless communication, according to certain modalities of this disclosure;
Figure 29 illustrates an example method 2900 for wireless communication, according to certain modalities of this disclosure;
Figure 30 illustrates an example communication flow showing link adaptation of multiple inputs, multiple outputs of multiple users (MU-MIMO) based on NZP CSI-RS for interference measurement, according to certain modalities of this disclosure; and
Figure 31 is a block diagram of a
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17/179 processing 2700, according to certain modalities of this disclosure.
DETAILED DESCRIPTION OF ILLUSTRATIVE MODALITIES
[041] The construction and use of the currently preferred modalities are described in detail below. It should be noted, however, that this disclosure provides many applicable inventive concepts that can be incorporated into a wide variety of specific contexts. The specific modalities described are merely illustrative of specific ways to build and use the disclosure, and do not limit the scope of the disclosure.
[042] Several modalities are motivated by one or more issues emerging from wireless networks as described below. A network point on a wireless network can be turned on or off based on traffic demand, power restrictions, emission restrictions, quality of service (QoS) restrictions, interference management purposes or other suitable factors. A modality solution for handling an event like this is based on UL Transition Request Signals (TRS) sent by a group of UEs so that the network can determine whether it is beneficial to connect a disconnected network point.
[043] Figure 1 illustrates an example system 100 for connecting or disconnecting a network point, according to certain modalities of this disclosure. In the illustrated example, if it is decided that Pico2 102 is to be switched on or off, UE1 104 and UE2 106, both of which are in the coverage area of Pico2 102, can be affected, as well as UE3 108, which it is not in the coverage area of Pico2 102, but it is not far from Pico2 102. UE1 104 and UE2 106 can be
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18/179 configured to measure and report RS from Pico2 and can be transferred to Pico2 102. That is, it may be appropriate to reconfigure UE1 104 and UE2 106 based on the RS of Pico2. The UE3 108 can observe increased PDSCH interference, which may be statistically or qualitatively different from the interference experienced previously by the UE 108. In one example, instead of being due to normal fluctuations of interference, this increased interference suffered by the UE3 108 can mean , at least in part, a sudden change in the interference condition of the UE3, which may result in special handling. It may be appropriate to change or reconfigure UE3 108 channel status information (CSI) (for example, CQI / PMI / RI) and radio resource management (RRM) measurement / radio link monitoring (RLM) processes and reports ). The network can fine-tune or fine-tune parameters before, during and / or after the transition. The network can assess the impact of network reconfiguration. Additionally, the network can send reconfiguration signals to an UE and / or an eNB to facilitate reconfiguration of the UE. Generally speaking, when a network point or carrier configuration goes through a transition, the transition can affect multiple other network points or carriers and multiple UEs in such a way that it may be appropriate to reconfigure the network points, carriers or UEs. A procedure to prepare, support and handle the transition and reconfiguration may be desirable.
[044] Figure 2 illustrates an example 200 system with interference from an eNB to an existing relay, according to certain modalities of this disclosure. In the illustrated example, interference by Macro2 202 for reception by
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Retransmitter 204 may increase if Macro2 202 changes its backhaul transmission (Tx) activities. For example, interference can increase if pre-coding by Macro2 202 oscillates beyond a threshold after some time, if backhaul Tx turns on or off because of changes in traffic pattern, or if Macro2 202 switches from Tx to Relay2 206 to Tx for Retransmitter3 208 because of changes in traffic patterns or other changes. These are examples of the network experiencing a transition, which can result in a chain reaction for multiple network nodes (for example, multiple network nodes experiencing sudden interference condition changes) over a period of time. As a result of the interference jump, or in anticipation of it, the Macrol 210 can adjust its transmission to the Retransmitterl 204.
[045] This setting can also cause interference changes from the Macrol 210 to other Macro transmissions. For example, it may be appropriate for Macro2 202 to also fine tune (for example, fine tune) its transmission to Retransmitter2 206 and / or RetransmitterS 208. This chain reaction of sudden interference jumps can cause the network to adjust your settings over a period of time. The effect of the adjustments can be difficult to predict unless the adjustments are actually tested on the network. Therefore, an efficient way of supporting adjustments without significantly affecting normal data transmissions may be desirable.
[046] As another example, algorithms and procedures proposed for network optimization can be based on
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20/179 iterations between multiple network nodes, and sometimes multiple UEs are also involved. An example involves optimizing cell connection junction and resource allocation, which can be difficult to perform in general and is often suboptimal in an iterative mode. A suboptimal solution can assume a fixed cell connection, and then a supposed optimal resource allocation for the given cell connection can be computed. The given resource allocation can be assumed, and the cell connection can also be updated. These procedures can be repeated until optimization is achieved or for some maximum number of iterations. Such iterations, however, can result in unwanted fluctuations and complexity that are not desirable for data transmissions (for example, PDSCH). For example, sometimes an iterative algorithm like this may not generate the desired performance or behavior in a number of iterations. The network configuration obtained after several iterations can be discarded in a case like this, and the network can revert to the original network configuration. When this situation occurs, normal data transmissions between multiple network nodes and multiple UEs can be significantly affected. Therefore, it may be desirable to separate resources and processes for normal data transmission from iterative polling, optimization, reconfiguration and tuning actions. When the iteration reaches convergence in the polling resources with the desired or acceptable performance or behavior, the achieved settings can then be applied to PDSCH transmissions.
[047] The above and similar questions can be
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21/179 summarized as follows. A network component can often adapt its activity or go through transitions. For example, it may be appropriate for a network node, carrier or antenna array to change from an activity level (for example, with reduced transmission power) or from a state (for example, a dormant state) to an activity level different (for example, with full transmit power) or to a different state (for example, an active state) when traffic, interference, or other conditions change. As an example, a dormant network node can be connected when a UE enters the coverage range of the network node. The reconfiguration of a first network node can affect several network nodes and UEs, potentially including the first network node itself, thus generating transient dynamics over a period of time. The impact of the transition or adaptation can be assessed by multiple network nodes and / or UEs before, during and / or after the transition or adaptation occurs. The procedure can be repeated, where the network node (s) and UEs further adjust or fine tune their settings. When a network node experiences or envisages a transition, the network node can signal its UEs and other network nodes about the transition so that the UEs and other network nodes can know when to adapt further. Several aspects of this general procedure are described below.
Interference Leap and Reconfiguration Signal for UE [048] In figure 1, when Pico2 102 starts transmitting PDSCH at time t, UE3 108 may experience PDSCH interference increased statistically or qualitatively different from before. This change in interference condition can be
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22/179 different from normal interference swings. Typically the UE3 108 performs layer 1 filtering for its CQI, interference, Received Reference Signal Quality (RSRQ), etc. For example, It = f It-i + (1-f) it-i can be used for interference filtering, where it-i is the instantaneous measurement in time t-1, and It-i is the filtered time measurement t-1, ef is the filter constant, usually 0.7 - 0.99. It can be a while the filter converges to the new interference condition, particularly if the interference measurement is based on CSI interference measurement capabilities (CSI-IM), which are sparse over time.
[049] For example, if the filter constant f is 0.9, then the filter time constant is 9.5 samples. In a particular example, it assumes approximately 2 to approximately 3 times the time constant for the filter to set at approximately 85% to approximately 95% of new filtered values. That is, in some scenarios, CRS-based interference measurements take about 19 milliseconds (ms) to about 28 ms to settle. Similar computations can show that measurements based on CSI-IM resources take about 95 ms to about 142 ms to fix if the CSI-IM resource has a 5 ms period, (for example, once in 5 ms). Measurements based on CSI-IM resources take about 190 ms to about 285 ms (or about 380 ms to about 570 ms, or about 760 ms to about 1,140 ms, respectively) to establish whether the CSI resource -IM has a period of 10 ms (or 20 ms, or 40 ms, respectively). These delays can cause the network to respond slowly to the interference jump, and the long transitional period may see some degradation in the user experience. In
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23/179 In particular, CQI / PMI / RI feedback and / or RSRQ measurements can be affected, causing divergences in CQI and RSRQ, and consequently the transmission to the UE may become less efficient. A smaller filter constant f can be chosen to reduce latency, but sensitivity to normal fluctuations can be very large if the smaller filter constant is used. Therefore, a reconfiguration signal sent by the network to a UE to notify the UE of a change in measurement conditions can facilitate reconfiguration of the UE and network operations. For example, the UE can restore its filter state upon receiving the signal (for example, the UE can restart the measurement process based on CSI-IM resource), or the UE can adjust its filter constant to a lower value. If the UE is signaled to set its filter constant to a lower value, the UE can receive another signal later indicating the completion of the transition or reconfiguration, and the UE can adjust its filter to the original value. In other words, the network can use reconfiguration signals to configure the UE to adapt the filter according to changes in the environment.
[050] A UE performs layer 3 filtering for Received Reference Signal Power (RSRP) and RSRQ (Received Signal Strength Indicator (RSSI)). In some scenarios, the accuracy of Layer 3 RSRP filtering may be affected when an interference condition changes, however it may be appropriate or not to re-establish Layer 3 RSRP filtering when an interference condition changes. For example, when the level of interference is normal, RSRP accuracy can be at a first level. When interference jumps to a much higher level, RSRP accuracy can degrade
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24/179 to a second level. It can be useful for the network and UE to know and incorporate changes in performance because of changes in network condition, so that the UE can adapt its estimation and RSRP filtering according to interference condition changes. Additionally or alternatively, Layer 3 RSRQ filtering can be reestablished when an interference condition changes. A typical input period for layer 3 filtering is about 40 ms, and a standard time constant is about 1.5 input sample duration, so about 2 to about 3 times the time constant is from about 3 to about 4 duration of input samples (about 120 ms to about 160 ms). Therefore, if the interference condition suddenly assumes a time close to the RSRQ / RSSI reporting time, then the reported RSRQ / RSSI may not reflect the actual interference condition. To facilitate the process, a signal to indicate the reset or reconfiguration can be used. If a reset is required for layer 3 operations, a rule can be created in which, upon receiving a reset signal, the UE restores its layer 3 filter or temporarily adjusts its filter coefficient.
[051] The values related to layer 3 described above can be computed based on Technical Specification (TS) 36.331 of the Third Generation Partnership Project (3GPP), which is incorporated into this document by reference in its entirety. In TS 36.331, the FilterCoefficient information element (IE) specifies the measurement filtering coefficient. The value fcO corresponds to k = 0, fcl corresponds to k = 1 and so on.
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Filtercoefficient information element - ASN1START
FilterCoefficient :: = ENUMERATED {fcO, fcl, fc2, fc3, fc4, fc5, fc6, fc7, fc8, fc9, fell, fc! 3, fc! 5, fc! 7, fc! 9,
sparel,. . . } - ASN1STOP
QuantityConfigEUTRA :: = SEQUENCE { filterCoefficientRSRP FilterCoefficient DEFAULT fc4, filterCoefficientRSRQ FilterCoefficient DEFAULT fc4}. The measured result is filtered, before being used to
evaluation of reporting criteria or for measurement reporting, using the following formula:
-d ~ ã) -F _n _ _l + aM _n where
M _n is the result of most recent received measurement from
physical layer;
F _n is the result of updated filtered measurement which is used for evaluation of reporting criteria or to
measurement reporting;
Fn-i is the result of old filtered measurement where Fo is
established for Mi when the first measurement result of the physical layer is received; and
a = 1/2 ^{<k / 4)} , where k is the filtercoefficient for the
corresponding measurement quantity received by quantityConfig.
[052] The filter can be adapted in such a way that the time characteristics of the filter are preserved at different input rates, noting that the filterCoefficient k assumes a sampling rate equal to 200 ms.
[053] Thus, an UE can adapt characteristics of
estimation and / or filtering based on
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26/179 reconfiguration received. Additionally or alternatively, since the network has information about the RSRQ / RSSI estimate, filtering and / or UE reporting settings, the network can coordinate the network components so that a sudden change in interference can occur in certain times depending on the timing of the RSRQ / RSSI estimate, filtering and / or reporting. For example, the network may allow a node to be turned on or off at a fixed offset from the RSRQ / RSSI report for a period of 200 ms or for a specified time interval other than the RSRQ / RSSI report.
[054] An eNB can send a network reconfiguration signal to a UE with a specific timing and associated with a CSI process configuration, CSI-RS resource configuration and / or CSI-IM resource configuration. UEs very close to the network node that made the transition are likely to be configured to receive CSI-RS from that network node. UEs that are too far from the network node that made the transition are unlikely to be affected by the transition. It may be appropriate to reconfigure UEs that are between too close to the network node or too far from it. Upon receipt of the reconfiguration signal, UE actions may include restoring filter states for interference estimation, CSI measurements and RSRQ measurements, and adjusting estimate and / or filtering parameters to adapt to a change in interference condition. UEs can also initiate a new signal or interference measurement process, stop a signal or interference measurement process, perform transfer to another point or carrier, etc. For brevity, IM is for interference measurement, IMR is for
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27/179 IM feature, CM is for channel measurement (intended) and CMR is for CM feature.
[055] If an eNB does not send a network reconfiguration signal to an UE initiates a reconfiguration, the UE can assume a reconfiguration that is appropriate when its CSI-RS resources or CSI-IM resources or CSI processes (for example, for a set of multiple coordinate points (CoMP) are reconfigured, as modified, removed or added. In general, assuming an objective of restarting the measurement process on the same resources, then reconfiguring a CSI process, CSI-RS resource and CSIIM resource to achieve this objective can result in greater overhead than sending a reconfiguration signal, which can achieve the same goal. However, if there is a synchronization pattern for restarting the measurement process, a synchronization window can be signaled or defined so that the UE can restart the measurement process at the end of each synchronization window.
[056] In addition to the overload concern described earlier, problems can arise if a UE attempts to interpret a signal as a measurement reset signal or a filter reset signal. In other words, there may be situations where an explicit measurement reset signal or filter reset signal is desirable. For example, for some UEs, using the CSI-RS resource configuration change signal, or the CSI-IM resource configuration change signal or the CSI process configuration change signal as a network reconfiguration signal can make trouble. If a UE moves, its CSI-RS resources may be upgraded
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28/179 naturally, and its interference condition may not have any abrupt change, so there may not always be a need to reestablish your measurement process or reconfigure filtering parameters and so on, even if the CSI-RS resource configuration of the UE is updated. A neighboring UE, in some scenarios, may not experience any change in CSI-RS resource, but may still experience a significant change in interference condition when a network transition occurs. Therefore, there are cases in which the configuration of CSI-RS resources, or CSI-IM resources or CSI processes can be updated, but in which it may not be appropriate for the measurement process to be re-established or the filter to be reconfigured. Cases in which CSI-RS resources, and CSI-IM resources and CSI processes are not updated, but where there may be a need for the measurement process to be re-established or the filter to be reconfigured, may also exist.
[057] The reconfiguration signal may or may not be the same as the transition decision signal (see, for example, the signal in Step 304 of figure 3, described in more detail below). For example, in a scenario, the transition decision signal can only link CRS / CSI-RS transmissions. Whether PDSCH transmissions will occur (which may result in more interference than RS transmissions alone) may depend on other factors such as CSI scaling and feedback. An eNB can send the reconfiguration signal if the eNB changes its levels of PDSCH activity significantly, such as binding PDSCH based on EU CSI feedback. In other words, the transition decision and the sudden interference jump can occur at different times, despite
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29/179 there is some connection between the transition decision and the jump of sudden interference. Separating the reconfiguration signal from the transition decision signal can also reduce or prevent system oscillation. For example, after an eNB transition from a dormant state to an active state, the eNB may receive UE measurement feedback reports and may decide not to serve the UEs and may even shut down. In a case like this, it may or may not be appropriate for neighboring eNBs to signal their UEs for reconfiguration and / or to reset their filters. The reconfiguration signal can be signaled by means of an upper layer either on the PDCCH or EPDCCH or on a common channel. Timing information can also be sent with the reset signal to indicate when the reset will be in effect.
Transition Adjustment Period
[058] A network component can often adapt its activity or go through transitions. When a network node experiences or envisages a transition, the network node can signal its UEs and other network nodes with respect to the transition so that the UEs and other network nodes can know when and how to adapt. This signaling can activate transient dynamics for a period of time called the Transition Adjustment Period, of which some procedures are described in detail below.
[059] An eNB can send a network reconfiguration signal to neighboring eNBs. Upon receipt of the reconfiguration signal, the actions of neighboring eNBs may include reconfiguring their UEs for CSI-RS resources, CSI-IM resources and / or CSI processes, receiving their CSI / RRM / RLM reports from
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EU, and change your transmissions / receptions and / or your EU associations / settings. The effect of an eNB having made the transition is assessed by the network. In some scenarios, eNBs additionally adjust their transmissions / receptions and their UE associations / configurations until convergence occurs or according to one or more exit rules.
[060] A transition in an eNB can induce multiple eNBs to also adjust their transmissions / receptions and their UE associations / configurations until convergence occurs. The steps described above can form a procedure for the network to fine tune or fine tune after a transition, and this procedure can be referred to as a Transition Adjustment Process. It may be appropriate to inform a number of eNBs and UEs about this process. The process can be performed on a specific subset of resources (for example, polling resources, as described below) or on all relevant resources. Whether the process is performed only on polling resources (which can be a subset of time / frequency resources), or on an expanded scale of resources, can be indicated on the reconfiguration signal.
[061] Figure 3 illustrates the Transition Adjustment Process method 300, according to certain modalities of this disclosure. In step 301, a first eNB signals to a UE about the information of an uplink transmission (via, for example, PDCCH or EPDCCH). In step 302, the UE performs the transmission based on the information signaled by the first eNB. In step 303, a second eNB performs receipt of the signal transmitted by the UE. In step 304, a third eNB makes a decision regarding
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31/179 transmission or reception of a fourth eNB, for example, the possible adaptation of transmission and reception, and sends reconfiguration signals to other eNBs.
[062] As part of the Transition Adjustment Process, in step 305, the fourth eNB transmits or receives a signal (for example, Tx CSI-RS, a positioning reference signal (PRS) or other reference signals). In other words, the fourth eNB may be a disconnected eNB that is starting to connect, or more generally the fourth eNB may be a network entity undergoing a transition such as on / off, power adaptation, carrier adaptation or carrier type adaptation. In step 310 (generally at the end of the Transition Adjustment Process), the fourth eNB transmits or receives a signal (for example, Tx PDSCH or other data loading signals). That is, the fourth eNB may begin to serve UEs and fit into data communications, and the transition involving the fourth eNB may be complete.
[063] In step 306, which can be performed in parallel with step 305, a fifth eNB signals to a second UE to receive or transmit (for example, CSI-RS from the fourth eNB, which was transmitted starting at step 305 , for RRM (RSRP / RSRQ) or CSI measurements). In step 308, the second UE measures and reports CSI / RRM / RLM for the fifth eNB. At this time, the second UE is not connected to the fourth eNB, and so communication (of information or control data) can happen with the fifth eNB. In step 311, the second UE receives (Rx) or transmits (for example, Rx PDSCH from the fourth eNB, if the measurement reports associated with the fourth eNB lead to a decision like this) as a result of the Process
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Transition Adjustment. In general, the fifth eNB and the second UE may be close to the fourth eNB, which is undergoing the transition, and the fifth eNB and the second UE may be affected by the transition. For example, the second UE can become connected and served by connecting the fourth eNB, and the fifth eNB can participate in the process of connecting the second UE to the fourth eNB.
[064] In step 307, a sixth eNB reconfigures and signals to a third UE regarding reconfiguration. In step 309, the third UE measures and reports CSI / RRM / RLM for the sixth eNB. In general, the sixth eNB and the third UE may not be close to the fourth eNB, which is undergoing the transition process, so the sixth eNB and the third UE may not be as affected as the components described in steps 306 / 308/311, but the sixth eNB and the third UE can still be affected since the third UE experiences interference transition when the fourth eNB is calling. To deal with the change in interference or in anticipation of this change, reconfiguration of the sixth eNB and the third UE can be done as shown in steps 307/309.
[065] From steps 310, 311 and 309, eNBs can exchange information in the backhaul, as shown in step 312. In step 313, the fourth eNB adjusts transmission or reception (for example, Tx CSI-RS at a level different power). For example, if the transmission power of the fourth eNB is considered to be too high by the network based on various feedback and measurement reports, the fourth eNB can reduce its transmission power, and the Transition Adjustment Process can continue until convergence occurs or certain criteria are met.
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[066] After the Transition Adjustment Process is complete, in step 314, a seventh eNB sends a reconfiguration signal to a fourth UE, as a new interference condition (or more generally, a network configuration) that exist. In step 315, the fourth UE performs reconfiguration (for example, restores its filters).
[067] The terminology, timing and order of timing in relation to figure 3 may not be rigid, some steps may be omitted, rearranged or changed and some terminology may be generalized or specialized. For example, step 304 can be included in the Transition Adjustment Process. The Transition Adjustment Process (steps 305-313) can be intertwined with decision-making processes (steps 301-304), and can be performed only on polling resources (for example, in parallel with other normal transmissions) or all relevant resources. The CSI-RS resource configuration change signal (step 306) and the reconfiguration signal (step 314) can be different in general.
Polling Resources
[068] A polling appeal process can be provided during the Transition Adjustment Process, for example. During the Transition Adjustment Process, the eNB with the point that has just been connected can test several different configurations. The test can be performed by adjusting the power levels (including turning on or off a transmission point and / or a carrier), adjusting the number of ports, adjusting the bandwidth, changing carriers, etc. Such actions can take place in an iterative mode. For example, eNB can transmit at a power level and,
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34/179 based on feedback from the UE, the eNB can increase or decrease the power level. Each power level may result in a different interference to other eNBs and / or UEs, and for this reason the other eNBs and / or UEs may need to adjust their settings, transmissions and / or receptions. These adjustments can cause a chain reaction that also affects the original eNB, and consequently more adjustments may be necessary. In this process, the PDSCH transmission of the UE may be affected. For each adjustment, the eNB monitors the feedback from the UE. Adjustments and feedback can cause network operation to oscillate in an unwanted mode, such as the UE experiencing lower than normal PDSCH transmission rates, such as hundreds of milliseconds. In other words, it can take a long time for the network to reach a configuration with adequate and desired performance, during which normal data transmissions can be impacted.
[069] An alternative is to perform a similar procedure in a proactive or prepared manner. For example, the impact or system performance can be predicted on a smaller scale of resources before the transition. Such a procedure can be performed in parallel with normal network operations, so normal operations may not be affected. These normal operations may include normal data transmissions, normal transmissions of control or system information, normal RRM / RLM / CSI measurements and feedback, etc. More suitable resources for the adjustment processes or drilling periods can be defined and / or allocated. ENBs can configure polling resources, and can flag the polling resources configured for selected UEs.
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A selected UE can be configured to measure in the probe resources (for signals and / or interference) over the same period of time, and can report CQI / RRM / RLM measurement reports. The network can repeat until it discovers a suitable transition and a suitable configuration after the transition, based on varying the transmissions in the polling resources and in the feedback reports. Finally, the network performs the transitions. Final transitions are expected to be less switching and shorter in time once the final decided settings have been tested to achieve the desired performance and / or to correspond to a steady state. Such a procedure can significantly reduce the impact on the network and the time spent on tuning or polling processes.
[070] Thus, during the Transition Adjustment Process, it may be useful to use polling resources, such as performing the transition adjustment only on polling resources. The network can predict the impact and / or system performance before the transition based on measurements on a smaller scale of resources. Prediction-related measurements can be made in parallel with normal network operations without affecting normal network operations. A selected UE can be configured to measure the probe resources (for signals and / or interference) during the same period, and can report CQIs, RRM measurements, RLM measurements, etc. The network can repeat until it discovers a suitable transition and a suitable configuration after the transition while continuing to adjust transmissions based on polling resources and feedback reports. Multiple configurations can be investigated in a parallel or
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36/179 sequentially. Finally, the network performs the transitions. Such a procedure can significantly reduce the impact on the network and the time spent on tuning or polling processes. The concepts and procedures of using polling resources can be adopted and used in general network reconfigurations, repeated network optimizations, etc.
[071] Polling resources may include polling reference signals (P-RS) and polling interference measurement (P-IMR) features. In LTE and LTE-A, P-RS can be considered a special CSI-RS, which can be called P-CSI-RS. A UE may not need to distinguish P-CSI-RS from another CSI-RS. P-IMR can be considered a special CSI-IM resource, which can be called P-CSI-IMR. A UE may not need to distinguish P-CSI-IMR from other CSI-IM resources. Any generalization or specialization or variation of the reference signals or interference measurement features in LTE or LTE-A can also be used for probing. An RRM / RLM or CSI report can be configured based on PRS and P-IMR. Therefore, polling resources can be transparent to the EU from time to time. The filter status can be restored once eNBs start or end testing a configuration. Restoration can include both signal measurements and interference measurements. The interference measurement reset can be activated by a reset signal for a UE. However, the signal measurement reset can be activated by another reconfiguration signal. Alternatively, this reset can be done automatically according to a specific timing window associated with the PRS or P-IMR or the corresponding CSI. The configuration of
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37/179 synchronism can be performed by means of signaling or specifications. Alternatively, activation signals can be sent to a UE to inform the UE about the start, intervals and end of the polling process. In existing standard specifications, multiple CSI processes (CSI reporting configurations, each of which is generally associated with a signal interference condition) can be supported, but only one RRM measurement process is supported. Introducing RRM measurements based on P-RS and P-IMR can introduce multiple RRM measurement processes into the system.
[072] In general, however, the polling resources may or may not be based on P-CSI-RS or P-CSI-IMR. The resources can be based on general P-RS and P-IMR, which can be any time / frequency RS resources and CSI-IM resources designated for polling purposes. In addition, resources may not be based on separate P-RS or P-IMR. Instead, the resources can be any general time / frequency resources usable for polling purposes. For example, reference signals such as CRS can be used for probing, and the UE may need to first detect the signals, then remove the signals to estimate interference on the same time / frequency resource, and finally generate CQI reports. For example, eNBs can designate some time / frequency resources in which some eNBs can transmit data and / or DMRS. The UE can decode the data and / or DMRS and can measure and report CSI (for example, CQI, PMI, RI, modulation and coding scheme level (MCS), RSRP, RSRQ, signal ratio for noise plus interference (SINR ), matrix
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38/179 channel covariance, interference level, interference covariance matrix, delta CQI, delta RSRP, delta RSRQ and / or delta interference), or the UE can measure and report the overall transmission condition (eg confirmation / negative acknowledgment (ACK / NACK) or the probability of a decoding error). ENBs can poll one or more configurations concurrently (for example, to use the frequency dimension to help reduce poll duration) across multiple poll resources, and UEs can measure and report on one or more CSIs. Polling resources may or may not be dedicated for polling purposes only. ENBs can instead reuse a subset of CSI-RS and CSI-IM resources to perform polling and can reuse a subset of CSI reporting configurations to report channel status. ENBs can also scale some physical resource blocks (PRBs) to transmit simulated data, using some configurations to be probed to verify UE feedback. ENBs can also allocate specific resources for polling and configure certain parameters for polling (such as measurement timing and / or reporting timing) and can signal resources and / or parameters to UEs. UEs can follow polling procedures defined with the parameters signaled in the specified resources, in which case the polling is not transparent to UEs. The polling resources being reserved by eNB may exist in UL time / frequency resources, in which case the polling can be done on the uplink.
[073] Polling resources can be used
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39/179 mainly for adjustment, probing and / or prediction purposes and are not limited to the transition from a switch on or off point. Such resources can be applied in adaptations and transitions of resources of general networks or in a change of transmission scheme (for example, a change of scheme CoMP) in an iterative mode. Such features can be used to fine tune or fine tune cell association, power levels, carrier selection, carrier / point on / off decision, load balancing / aggregation / switching, number of antenna ports, antenna configurations, bandwidth, antenna slopes, codebook structures and parameters, classification adaptation or pre-coding. Such resources can be used to provide eNB with the ability to dynamically use a different transmission scheme based on feedback using the polling resources. Polling resources can be configured differently for sub-bands to experiment with at the same time. Feedback based on polling resources can be weighted more lightly than other feedback, for example, less accuracy, less overhead and / or with PMI / IR, etc. Measurement and feedback reports based on polling resources can include CQI, PMI, RI, MCS level, RSRP, RSRQ, channel covariance matrix, interference level, interference covariance matrix, delta CQI, delta RSRP, RSRQ delta and delta interference. Such reports can also be used for UL tuning or polling or performance prediction. In addition, in order for the network to be able to determine suitable transmission schemes by polling, the network may need to support many or
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40/179 all modes of transmission in polling resources. For example, normal data transmission can be in transmission mode 8 (TM8), while polling transmission is established to be consistent with TM10. To determine data SINR for, for example, TM10, by polling, the network can configure a UE to first report CQI / PMI / RI / MCS based on reference signal capabilities and interference measurement capabilities of poll. Following the first report, the UE reports SINR based on data (or simulated data) received in drilling resources.
[074] In E-UTRA, RSRQ is the ratio NxRSRP / (RSSI of E-UTRA carrier), where N is the number of RBs of the RSSI measurement bandwidth of E-UTRA carrier. The measurements on the numerator and denominator are made on the same set of RBs. RSSI of Carrier E-UTRA comprises the linear average of the total received power (in [W]) observed only in OFDM symbols containing reference symbols for antenna port 0, in bandwidth measurement, in N number of RBs by the UE of all the sources, including cocanal server and non-server cells, adjacent channel interference, thermal noise, etc. If higher layer signaling indicates certain subframes to perform RSRQ measurements, then RSSI is measured on all OFDM symbols in the indicated subframes. In future releases, RSSI can be measured on certain REs specified by eNB. In general, total received power includes all radio frequency (RF) signals received by a UE, such as signals from server cells, interference and noise, in the time / frequency resources specified in the specifications or
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41/179 indicated by a network controller.
[075] Figure 4 illustrates a timeline of operations 400 for a transition adjustment period 402 based on polling resources, according to certain modalities of this disclosure. In the first column 404, eNBs, for example, eNBl 406 and eNB2 408, reserve poll resources, and coordinate poll transmissions and timing. In second column 410, eNBs test poll transmissions and adjust. In the third column 412, convergence is achieved in drilling resources. In the fourth column 414, the network operates according to the selected reconfiguration. Additional details of various modalities are described below.
[076] Figure 5 illustrates an example timeline of operations 500 for a transition decision process and a 502 transition adjustment based on polling resources, in accordance with certain modalities of this disclosure. The network prepares for the transition and adapts to the transition until stabilization, or experiments with different configurations to discover a desired or ideal configuration in 504. Convergence and / or the desired behavior is achieved in the polling resources in 506, and the network selects one reconfiguration and operates according to the reconfiguration selected in 508.
[077] In several modalities, an eNB experiencing a transition or anticipating a transition can perform the following steps. The eNB can send a reconfiguration signal, along with timing information, in the backhaul to other eNBs. The eNB can send a reconfiguration signal, along with timing information, to its UEs. ENB can configure polling resources, including a P-RS
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42/179 and a P-IMR for its UEs, and can set up a transmission scheme with coordination with other eNBs in the polling resources. The effects of the transition and reconfigurations are evaluated iteratively and / or predicted by the network only in the polling resources. The final configuration obtained at the end of the evaluation period is then applied to all relevant resources. The relevant resources may or may not be in the same type of carrier as the one on which the survey was carried out. For example, the final settings can be applied to a new type of carrier (NCT) while polling may have been done on a carrier compatible with Release 8.
[078] Several modalities provide methods and systems for transmitting, receiving and signaling for reconfiguration in wireless networks. Modalities provide signals and processes supporting the reconfiguration, after the transition or in conjunction with the transition. Such signals and processes may include backhaul signaling to coordinate reconfiguration between multiple nodes, reference resources, such as polling resources including P-RS and P-IMR, to measure the effect of transition and reconfiguration by UEs, and reconfiguration signaling. for UEs to indicate the occurrence of transition and reconfiguration for the UEs. For example, UEs can restart their measurement processes to the updated settings.
[079] In one embodiment, the impact of the transition and adaptation can be assessed by multiple nodes and / or UEs before, during and / or after the transition and adaptation takes place. Probing resources based on CSI-RS and interference measurements can be used to assess the impact of the transition,
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43/179 adaptation and / or reconfiguration before the transition, adaptation and / or reconfiguration is applied to the PDSCH. In one mode, the network and UEs can adjust their settings. Signaling an eNB to a UE or to another eNB may indicate that a transition and / or reconfiguration will occur in such a way that the UE and other eNBs can operate accordingly. Modalities provide signals and reconfiguration processes when the network adapts its topology and / or transmissions. Modalities can be implemented in telephone sets and networks used in wireless communication systems.
[080] Polling process may or may not involve UEs. For example, as described with reference to figure 2, polling process can be used to reconfigure transmissions between macros and retransmitters over the air. Polling may or may not involve eNB reconfigurations. For example, on a device-to-device (D2D) or direct mobile communication (DMC) network, polling can be used to reconfigure transmissions between UEs. In these cases, the general approaches having been described in several modalities can still be applied with appropriate modifications.
[081] As an example, a network may experience decreased traffic load and may try to turn off some spikes to save energy or reduce emissions. The network can determine some candidate peaks to be shut down. However, these candidate peaks may be serving UEs, and if some of the peaks are actually shut down the UEs being served by the peaks may need to be offloaded to other active peaks. Such unloading can change
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44/179 significantly various aspects of network operations, such as interference conditions, peak / UE associations and peak loads. For example, if a UE is discharged from its current server peak to a second peak, the second peak may experience an increase in its load. If the load increase exceeds a threshold, the UE's QoS may suffer significantly, and consequently the network may decide not to discharge to the second peak or may decide not to disconnect the first peak. It can be seen through this particular example that the network may need to predict operating conditions before making a transition decision; otherwise, serious problems can be caused. A prediction like this, although very useful, is very difficult without actually being tested on the network. In this situation, polling can be beneficial. For example, in some polling resources, a first peak emulates the status at which it is turned off (and consequently interference to UEs from neighboring points is reduced) and its UE is discharged to a second peak. The UE reports the CQI associated with this polling configuration, which can help the network determine whether the decision to shut down the first peak is eventually beneficial or problematic for the network. A second peak can perform a real transmission and / or scheduling of a UE on the polling resources, so the network can obtain a lot of information regarding the impact of turning off a peak and downloading a service from the UE.
[082] Optionally, for DL or backhaul signaling, an eNB can send a reconfiguration signal or together with a synchronism to UEs and other eNBs. The UE can assume that a new measurement condition, for example, for measurements
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45/179 of signals and / or interference measurements, will be in effect for a CSI-RS resource configuration, CSI-IM resource configuration and / or indicated CSI process configuration. ENBs can be assumed to reconfigure according to feedback from their UEs based on the indicated resource configuration.
[083] Optionally, for DL or backhaul signaling, an eNB can send a signal to indicate the beginning and / or end of a transition adjustment period. Within the period, polling resources can be used to experiment with various configurations. A UE can apply a measurement timing window during the period. After each measurement synchronization window, the UE can restart its measurement process in the polling resources.
[084] With respect to UE reconfiguration signal design, if the reconfiguration signal is on the PDCCH or EPDCCH, latency may be small, but downlink control (DCI) information formats may need to be modified to include reconfiguration indications. Reconfiguration may not be logically related to DL / UL leases as it can happen when an eNB needs to transmit a reconfiguration signal to an UE, and the eNB has no DL / UL leases for the UE. So a reconfiguration signal can be a field of a DCI format, or it can be a special lightweight DCI for reconfiguration. If the reconfiguration signal is in upper layer signaling, the latency may be high, but there may be no need to modify DCI formats. If the reset signal is on common channels, not all UEs may need to be reset.
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[085] Regarding UE behavior, in general, the design and operation of UE layer 1 filtering is an implementation issue not specified in the specifications. However, the UE can be flagged if a network transition occurs, which may require specification support. Whether and / or how the UE generally reacts is left for implementation, which does not require specification support. EU Layer 3 filtering for RSSI / RSRQ may need to be re-established, and if so, this filtering may need to be standardized for the network.
[086] With respect to UE behavior, if polling resources are used primarily to generate the polled CSI, the UE may need to classify marriage with the polling resources, regardless of whether the resource is used as P-RS or P -IMR, and regardless of whether the polling resources are CSI-RS / CSI-IM resources or not. However, if the polling resources carry actual data (for example, polling resources are used for data transmission instead of data for measurement), then the UE may not perform rate matching on all polling resources. Instead, the UE may perform rate matching on a subset of polling resources that are for measurement purposes. Appropriate rate matching signaling can be used to support such operations, such as signaling zero power CSI-RS configurations to a UE.
[087] The probing resources can be associated with an activation or with a synchronization window to automatically restart the measurement process. RRM / CSI feedback reporting configurations based on
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47/179 polling may differ from other feedback reports. Therefore, multiple timing settings can be used for multiple process or measurement configurations.
[088] In a modality method for adapting to a wireless network, eNBs coordinate and reserve a set of time / frequency resources for polling purposes, eNBs coordinate a set of operations (poll transmissions) and timing to be used to synchronize actions from eNBs and UEs, eNBs signal resources and timing to UEs, eNBs perform coordinated operations on resources according to timing, and eNBs receive feedback reports from UEs based on UE measurements on signaled resources according to the signaled synchronisms (eNBs collecting poll impact). ENBs additionally coordinate operations for additional polling or to apply poll broadcasts over broader time / frequency resources.
[089] A method of modality for adapting to a wireless network includes the following steps. The eNBl sends to UE1 a configuration of a measurement process, a configuration of measurement resources associated with the measurement process, a time interval associated with the measurement process, and a reporting configuration associated with the measurement process. These items as a whole can be referred to as polling related configurations. One or more of these configurations can be combined as one configuration or included in another configuration. For example, the configuration of measurement resources can be included in the configuration of a measurement process. The measurement process
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48/179 can be a CSI process as defined in Release 11 3GPP, which can contain configurations of channel measurement and / or interference features (for example, CSIRS features and CSI-IM features). The reporting configuration can indicate periodic reporting (in which case the periodicity and displacement of reporting subframes can be flagged) or aperiodic reporting (in which case reporting activation information can be flagged). The time interval specifies that the measurement can be performed within the time interval.
[090] In addition, eNBl can send signaling to UE2 to indicate probe related settings relevant to UE2. The time interval sent to UE2 can generally be the same as that sent to UE1. The other configurations sent to UE2 may or may not be the same as those sent to UE1. Not all UEs served by eNBl can receive such configurations.
[091] Upon receipt of the settings, the UE1 can perform a measurement according to the measurement process configuration based on the measurement feature configured within the configured time interval. For example, UE1 can perform SINR measurement based on the CSI-RS resource and the CSI-IM resource, starting from the beginning of the time interval and ending at the end of the time interval. Then the UE can generate a report according to the measurement process configuration and the reporting configuration based on the measurement.
[092] An eNBl can send time interval information and / or measurement resource configuration information to eNB2. In general, the information of
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49/179 measurement resource configuration can be associated with UE1 and / or UE2, or with part or all UEs receiving configurations related to eNBl polling, but the measurement resource configuration information may or may not be identical to the measurement resource configuration received by any eNBl UE. In other words, eNBl can aggregate and / or select the measurement resource settings sent to its UEs, and send the aggregated and / or selected measurement resource settings to eNB2. The eNBl can also send time interval information and / or measurement resource configuration information to eNB3. Although in general the time interval information is the same, the measurement resource configuration information sent to eNB3 may or may not be the same as that sent to eNB2. The eNB2 can send poll-related configurations to its UEs, where, in general, the time slot information is the same for all UEs and all eNBs (however the network has the flexibility to configure the time intervals differently for different eNBs and / or UEs if there is some propagation isolation, for example).
[093] The time interval can be configured as a start time, a time duration and / or an end time. The start time can be indicated as a time shift (such as a number of subframes later than the receiving subframe), or as a time in the future (such as a subframe within a radio frame with a certain number system board), or through a start time activation. The end time can be indicated in a similar way. Alternatively, the
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50/179 termination can be indicated indirectly from the beginning and a duration of time. There can be multiple time intervals, which can be contiguous in time. Time intervals can be indicated by means of a start time using the methods described above as well as by periodicity. Alternatively, the periodicity signal can be sent at the start time of the first time interval so that the UE can obtain both the periodicity and the start time of a signaling.
[094] Another way of specifying multiple time intervals for an UE is based on start time activations. When the UE receives a first start time activation, the UE starts the measurement. When the UE receives a second start time activation, the UE understands that the first time interval is ending and the second time interval is starting, and the UE restores the measurement process accordingly. With one or multiple time intervals, the UE generates one or more measurement reports according to the measurement process configuration and the reporting configuration. Each report is based on measurement on the measurement features configured within a time span of one or multiple time frames. The timing setting can also include one or more timing intervals during which the UE does not perform measurements. The configuration of a synchronism interval can be combined with the modalities described previously. A UE can receive a set of time slots for one type of measurement and another set of time slots for another type of measurement, such as time slots
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51/179 different for RRM and CSI measurements, or different time intervals for signal and interference measurements.
[095] A point can adopt a backhaul connection only state, a limited monitoring state, a polling state or an active state. In the backhaul connection only state, the point has its Tx / Rx through the air completely turned off and can only signal Tx / Rx in its limited backhaul. In the limited monitoring state, the point can perform Rx through limited air and no Tx through air, and Tx / Rx can signal in its limited backhaul. In the polling state, the point can perform Rx through the air, Tx through the reference signal air, and Tx / Rx in its limited backhaul. The point can adjust its transmission parameters (for example, RS power) during this state. In the active state, the point can perform Tx / Rx via data air and Tx / Rx on possibly high-speed backhaul.
[096] Figure 6 illustrates state transitions 600 to a point in a network, according to certain modalities of this disclosure. The point may transition between a backhaul connection-only state 602, a limited monitoring state 604, a polling state 606 and an active state 608. A point undergoing a state transition may need to signal to its UEs and neighboring points over the air or through the X2 interface, which can activate a transition adjustment process across multiple eNBs and UEs. A point here can be a cell, antenna array, frequency / carrier band, macro / peak / femto / retransmitter, etc. Furthermore, a point can be changed to a completely off state or the
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52/179 from it, and the process of reconfiguration and transition adjustment can be applied equally.
[097] Figure 7 is a diagram of a system 700 with a coordinating entity (EC) 702 coordinating multiple eNBs 704, according to certain modalities of this disclosure. The CE 702 can be a macro eNB or another network entity. SeNB 704 represents secondary eNB (or small cell), which can be coordinated by CE 702 through the Xn interface, usually in a non-ideal backhaul. SeNBs 704 can be connected via the X2 interface, usually in a non-ideal backhaul. The EC 702 can coordinate on / off, carrier selection, load balancing / switching / aggregation and other general interference management and coordination operations for SeNBs 704. UEs 706 and 708 are coupled to SeNBs 704.
[098] Figure 8 shows an example of drilling operation 800 in this system architecture, according to certain modalities of this disclosure, and flowcharts are shown in figures 9-11, according to certain modalities of this disclosure.
[099] In figures 9-11, the annotations within the parentheses indicate on which interface the signaling is sent. Xn indicates signaling sent on the Xn interface, while AI indicates signaling or data sent on the interface over the air. A flow chart for the operation of CE 900 is shown in figure 9. In step 902, the EC coordinates polling resources for a plurality of eNBs. In step 904, the EC informs the eNBs about the drilling resources. In step 906, the EC coordinates one or more poll transmissions with synchronisms. In step 908, the EC informs the eNBs about
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53/179 of poll transmissions and timing. In step 910, the EC receives measurement reports from one or more eNBs. In step 912, the EC makes the adaptation decision, and in step 914 the EC informs the eNBs about the decision.
[0100] Figure 10 shows a flow chart for the operation of eNB 1000, according to certain modalities of this disclosure. In step 1002, the eNB receives allocations from polling resources from the EC. In step 1004, eNB configures the EU measurement resources and / or processes. In step 1006, the eNB receives poll transmissions with synchronisms from the EC. In step 1008, the eNB signals measurement timing for one or more UEs. In step 1010, eNB performs poll transmissions on polling resources according to the timing. In step 1012, the eNB receives measurement reports from the UEs. In step 1014, eNB sends measurement reports to the EC. In step 1016, eNB receives the decision from the EC. In step 1018, the eNB signals data to the UE according to the decision.
[0101] Figure 11 shows a flow chart for the UE 1100 operation. In step 1102, the UE receives resources and / or measurement settings from the eNB, according to certain modalities of this disclosure. In step 1104, the UE receives eNB measurement timing signaling. In step 1106, the UE performs measurements on resources designated according to timing. In step 1108, the UE transmits measurement reports to the eNB. In step 1110, the UE receives signaling from the eNB regarding new configurations. In step 1112, the UE receives data according to the new settings.
[0102] The previous description was directed to network adaptation based on polling, which deals with wide network configurations such as the
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54/179 transmission used on the network, transmission power levels used on the network, network nodes that are turned on or off, whether advanced CoMP or similar transmission techniques are used, and similar topics. The description will now return to probe-based link adaptation, which can be considered a special case of probe-based network adaptation.
[0103] In a wireless network, polling can be used to determine the appropriate link adaptation, including MCS levels, classification and UE matching (for multiple inputs, multiple outputs from multiple users (MU-MIMO), for example ). In one embodiment, in such a probe-based link adaptation, a server eNB and one or more potentially interfering eNBs transmit probe signals to a UE before transmitting actual data signals. ENBs transmit the polling signals at the same time and in the same time / frequency resources. Thus, the interference that the UE experiences in a poll transmission is similar to the interference that the UE will experience in a real data transmission. The REs on which a polling signal is sent are a subset of the REs that will be used for actual data transmission. That is, the number of REs occupied by a polling signal is less than the number of REs in a subframe. The UE measures the CQI or some other channel quality parameter of the probe signals and, based on the measurement, determines an MCS level appropriate for the current channel conditions. The UE then informs the eNBs about this MCS level. ENBs then use this MCS when transmitting real data to the UE. In this way, eNBs can transmit at an MCS level that is appropriate for
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55/179 current channel conditions.
[0104] In particular, in one modality, multiple eNBs transmit on the same time / frequency resources as the P-RS using a tentative MCS. These streams can be called pre-streams, poll streams or PTX. UEs receiving the P-TX perform measurements on the P-RS and calculate an updated MCS, for example. Alternatively, a CQI or other channel quality parameter can be derived based on the MCS. If multiple layers are used, multiple MCSs may need to be calculated. The updated MCS is reported to eNBs. Alternatively, the MCS can be indicated by the difference between the MCS and a known reference MCS for at least one of the eNBs and the UE. The eNBs then perform the actual data transmissions associated with the P-TX using the updated MCS. Actual data transmissions can be called actual transmissions, post-poll transmissions or A-TX. Since the transmission scheme and other parameters associated with the A-TX are the same as those associated with the PTX except for the MCS, and since changes in the MCS have little impact on the RIS of the UEs, it can be seen that the UEs experience almost the same SINR on A-TX and P-TX. Consequently, the MCS determined during P-TX will match the SINR in A-TX reasonably well. In other words, polling can be used to significantly reduce divergences in link adaptation. The much improved precision in link adaptation can then translate into throughput performance gains.
[0105] Figure 12 illustrates a modality of the link adaptation procedure based on sounding, according to
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56/179 according to certain modalities of this disclosure. In 1202, an eNB transmits signals for scheduling, resource allocation and corresponding polls. In 1204, a UE receives the corresponding escalation, resource allocation and polling signals. In 1206, the UE measures the signal and interference and estimates an MCS level. In 1208, the UE sends a measurement report containing the estimated MCS level. In 1210, eNB receives the measurement report. In 1212, eNB decides on an MCS level. In 1214, eNB transmits data based on the corresponding scheduling, resource allocation and MCS information. In 1216, the UE receives data transmission. Alternatively, in 1208, the UE sends an MCS level determined based on the measured signal and interference, and in 1210 the eNB receives the MCS. In 1212, the eNB decides to use the received MCS level, and in 1214 the eNB transmits using the received MCS level.
[0106] It can be noted that a poll result based on one P-TX can be applied to more than one A-TX. In the case of multiple A-TX to one P-TX, eNBs can perform scaling and pre-coding on all sub-frames of A-TX consistent with P-TX. In general, the timing between transmission resource (s) allocation information, polling resource, polling feedback, MCS information transmission and data transmission can use a maximum of 4 transmission time intervals (TTIs) as shown in figure 12, but 3 or even 2 TTIs may be sufficient if the UE can receive the P-RS early enough (for example, using CSI-RS on the fifth and sixth OFDM symbols) and process the measurements fast enough (for example , send report in N + l) and if eNB
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57/179 can prepare the A-TX (transmission block sizes (TB), etc.) fast enough. In time division duplexing (TDD) systems, polling can be used in a similar way, but timing and / or latency can be different from frequency division duplexing (FDD).
[0107] Figure 13 shows a polling mode for link adaptation, according to certain modalities of this disclosure. In figure 13, in subframe n 1302, eNBl 1304 executes P-TX on P-RSs (as an example, P-RSs are CSI-RS and in particular they can be non-zero power CSI-RS (NZP)) . That is, eNBl 1304 transmits sounding signals in the time / frequency resources identified by pre-coding, pre-coding2 and pre-coding3, which are a subset of all the time / frequency resources available in subframe n 1302. When At the same time, eNB2 1306 transmits polling signals on the time / frequency resources identified by pre-coding4, pre-coding5 and pre-coding6, which correspond in time and frequency to the time / frequency resources identified by pre-coding, pre-coding2 and pre-coding3. The P-RSs transmitted by eNBl 1304 and eNB2 1306 can be pre-encoded with specific RB pre-encoding. That is, each RB may be allowed to have different pre-coding and classification, but some RBs may share the same pre-coding and classification (see below for details).
[0108] A modulation level for these P-RSs can be set to be quadrature phase shift (QPSK) switching for simplicity of UE measurements, but higher order modulations are also allowed for
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58/179 higher link adaptation accuracy. The coding rate can be chosen to be the lowest coding rate for the associated modulation level, or it can be one set at a predetermined coding rate known to the UEs, or it can vary dynamically. That is, the MCS level used for probe transmissions may or may not be ideal for the channel conditions experienced by the UE, but probe transmissions can be used to determine an appropriate MCS level for those conditions.
[0109] It is possible that more than one CSIRS configuration can be used as the P-RS, which can help to increase processing gains for polling. Multiple probes within an RB can also be allowed for different vectors or precoding matrices. P-RS may not need to extend over full bandwidth. In other words, CSI-RS on some RBs may not be used for polling for link adaptation. The UE can treat such RBs as regular CSI-RS for measurements.
[0110] Some UEs served by eNBl 1304 may receive eNBl 1304 signaling regarding the poll. Such signaling can indicate to a UE the time / frequency resources on which the specific UE poll is performed. For example, UE1 may receive signaling that the resources associated with pre-coding 1 and 2 are for polling UE1. In this case, in general, pre-coding 1 and 2 are the same. UE2 can receive signals that the resources associated with pre-coding 3 are for the UE2 poll. Also, some UEs served by eNB2 1306 may receive eNB2 1306 signaling regarding the poll. UE3 can receive
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signaling in that the associated resources with The pre- codification 4 are for survey of UE3. 0 EU4 can to receive signaling in that the associated resources with The pre- codification 5 and to 6 are for the UE4 survey. In this case,
in general, pre-coding 5 and 6 are the same. That is, which RBs are used for which UEs can be partitioned differently for different eNBs.
[0111] Then the UE can follow the instructions of the eNB for measurements for sounding. Signal measurement for the UE can be obtained from all probe resources assigned to that UE (with appropriate filtering). Interference measurements for the UE can be obtained from all probe resources for that UE, removing the effects of the signals. Then the UE can obtain a composite SINR for all of the polling resources assigned to that UE (with appropriate processing) and / or a composite CQI and / or MCS for all of the polling resources assigned to that UE (with appropriate processing). The measurement result obtained is then sent as feedback to the eNB. If multiple measurement processes (for example, CSI processes) are configured for probing, then the UE may not be allowed to mix the signal measurements for different processes, and it may not be allowed to mix the interference measurements for different processes. However, within the same processes, signal measurements can be combined, and interference measurements can be combined according to the eNB indication.
[0112] The modulation level for P-RS can be simply QPSK, which matches the general RS design, and has the advantage of simple demodulation. In addition, the level of
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60/179 P-RS modulation in general does not affect the survey SINR, from the point of view of signal statistics or interference statistics. However, if a more complicated receiver algorithm has to be used, such as maximum probability (ML) receivers with interference cancellation, then QPSK may not be suitable for all polls, and P-TX and A-TX may use the same level of modulation in order to have precise link adaptation.
[0113] Later, as in subframe n + k 1308, eNBs execute A-TX. That is, eNBl 1304 and eNB2 1306 transmit data in subframe n + k 1308 over time / frequency resources that were not used for poll transmissions in subframe n 1302. The allocation of resource (s) to each UE in a different way overall is the same as that for P-TX. In one embodiment, the time interval between subframe n 1302 and subframe n + k 1308 is configured as common for eNBl 1304 and eNB2 1306. The (new) MCS level on A-TX for each UE is in agreement with EU poll feedback. For example, pre-coding 1 is used by eNBl 1304 for UE1 in all RBs for UE1, and the new associated MCS is used. Likewise, pre-coding 3 is used by eNBl 1304 for UE2 in all RBs for UE2, and the new associated MCS is used. Pre-coding 4 is used by eNB2 130 6 for UE3 in all RBs for UE3, and the new associated MCS is used. Pre-coding 5 is used by eNB2 1306 for UE4 in all RBs for UE4, and the new associated MCS is used. If, on P-TX, eNBl pre-coding is transmitted together with eNB2 pre-coding on an RB, then it may be desirable (at least for
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61/179 simplicity) that in A-TX, the pre-coding of the eNBl is
transmitted together with pre-coding the eNB2 at streaming data RB.[0114] Some escalation changes real a
pre-escalation may be allowed, but it may be desirable for changes to be made in such a way that each EU continues to experience the same amount of
interference. Per example, at changes can to be an reorganization of positions From RBs per all the eNBs simultaneously, or an escalation From numbers of RBs for
a subset of the UEs by all the eNBs simultaneously. In addition, as the interference in the n + k 1308 subframe becomes predictable, precise link adaptation is achieved, and transmissions to the UEs can be successful in an attempt. A more aggressive transmission can result in decoding failures. Rate matching and / or bit suppression can be specified so that a UE can remove non-PDSCH REs. Matched rate REs or bit suppression REs can be more than P-RS REs used by the UE. Generally speaking, if CSI-RS is used for polling, rate matching may be based on zero-power CSIRS (ZP), and therefore additional rate matching signaling may not be necessary. However, if CSI-RS is not used for polling, then rate matching may need to be specified.
[0115] P-TX signaling can be designed as follows. First, the signaling can be a DCI (for example, physical layer signaling (PHY) loaded on a PDCCH or EPDCCH in the same subframe as the P-TX). Signaling can be either UE specific or UE group specific. THE
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62/179 signaling can be independent of signaling for actual scheduling (if any) in the subframe. Signaling can indicate to a UE that one or more of the CSI-RS configurations are used for polling (for example, used as PRS, which can be restricted in certain RBs, sub-bands and / or resource block groups (RBGs )). PTX signaling may not need to include a CSI-IMR. The number of layers and / or antenna ports can be indicated. Signaling can indicate to a UE the RBs, sub-bands, RBGs and / or virtual component carriers (CCs) on which the UE is to perform sounding measurements based on the P-RS. Signaling can indicate to a UE that averaging is not to be performed on the polling resources. Signaling can indicate to a UE the RBs, sub-bands, RBGs and / or virtual CCs on which the UE is not to perform measurements based on PRS. For those CSI-RS REs, measurements based on regular CSI-RS can be performed as indicated, or the UE can ignore these CSI-RS for measurements as indicated.
[0116] If, according to certain modalities, the UE is required to report measurements for all RBs, sub-bands, RBGs and / or virtual CCs, but the UE was not informed by the pre-escalation signal to perform measurement in some of the RBs, sub-bands, RBGs, and / or virtual CCs, the UE can take measurements based on regular CSI-RS on these resources and report on those measurements, or the UE can report INVALID. Multiple polling processes can be indicated. The way in which the measurement report is to be generated can also be indicated. The P-TX signaling can also include information related to the uplink, such as whether the UE should report its measurements in PUCCH or in
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PUSCH and the subframes and / or RBs in which the UE should report its measurements. The P-TX signaling may or may not be in the same subframe and / or the same carrier as the P-RS. That is, a cross-frame and / or cross-carrier pre-scheduling may be allowed. P-TX signaling that includes such information can be referred to as an activation, since such signaling activates the UE to perform measurements on the polling signals. Likewise, a DCI that includes such information can be referred to as an activation.
[0117] The UE can generate a probe measurement report based on all the probe resources indicated by the signal. That is, an MCS and / or SINR common to all survey resources indicated by the signaling can be generated and reported. Alternatively, multiple probe measurements for the RBs, sub-bands and / or RBGs as indicated by the signaling (or for all RBs, sub-bands, RBGs and / or virtual CCs on the carrier) can be generated. That is, a separate MCS and / or SINR for each frequency unit of the polling resources indicated by the signaling (or for the total carrier bandwidth) can be generated and reported. The survey measurement report may contain less information than traditional CQI reporting. In particular, the probe measurement report can contain only the MCS level selected by the UE based on the probe signal.
[0118] A-TX step signaling may be related to PTX pre-step signaling. For example, the UE can assume that the resource allocations in the two subframes are identical, unless the eNB modifies the allocations. In general, the
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64/179 classification, layer, port and / or PMI (if necessary to be flagged for UE, as in a TM not based on DMRS) can be the same as for P-TX, so the signaling may not need to load these fields . However, information such as the updated MCS or the new data indicator may need to be flagged. Alternatively, A-TX scheduling signaling can be independent of the P-TX prescaling signaling, and eNBs can have more flexibility when modifying the allocation of A-TX resource (s).
[0119] In poll-based link adaptation, multiple eNBs can transmit polling signals at the same time and on the same frequency resources. Thus, the UE may experience interference that floods the signal. In one embodiment, clustering of frequency units can be used to address this issue. A frequency unit can be RBs, sub-bands, RBGs or virtual CCs. The following modality is illustrated in RB grouping, but can be applied to a similar frequency unit. In RB grouping, some RBs (for example, 2, 3, 5, 6, 10, 12 or more) can be grouped as a pre-scheduling unit or scheduling unit. As a consequence, an eNB can assign the grouped RBs to an UE, with the same pre-coding. For example, for eNBl, P-RS on RBs 0, 1, 2 can be assigned to UE1 and a common pre-coding can be used on this P-RS, and P-RS on RBs 3, 4, 5 can be assigned to UE2 and a common pre-coding can be used on this P-RS and so on. More than one grouping of RBs can be assigned to a UE. For eNB2, the P-RS in RBs 0, 1, 2 can be assigned to UE3 and a common preset can be used in this P-RS, and P-RS in
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RBs 3, 4, 5 can be assigned to UE4 and a common preset can be used on this P-RS and so on. The grouping for the eNBs can be aligned. The grouping can be known for both of the eNBs and their UEs being polled. The UE can assume the interference in each cluster to be the same. For example, for each of the dominant interferents performing a poll, the pre-codifications in the P-RS in the cluster are the same. Consequently, the UE can estimate interference, for example, interference statistics and interference covariance matrices, more precisely in the P-RS in each cluster for better estimation of SINR, CQI and / or MCS. Through clusters for the UE, the UE may not be able to assume the interference to be the same unless otherwise notified by eNB. Grouping can also help to reduce signaling overhead for polling.
[0120] The previous example is for pre-scaling or P-TX. For A-TX, grouping can be used or not, and if used the same or a different grouping can be used. In any case, eNBs may need to ensure that the interference (or at least the dominant interference interference) seen by each UE is the same as that of PTX. For example, if on P-TX, UE1 of eNBl is designated with RBs 0, 1 and 3 with pre-coding x, and RBs 0, 1 and 3 of eNB2 have pre-coding A, A and B, then in A-TX eNBl can designate UE1 with RBs 0, 1 and 3 with pre-coding x, and eNB2 can designate pre-coding A, A and B for RBs 0, 1 and 3. Alternatively , on A-TX, eNBl can designate a UE with RBs 0 ~ 5 with pre-coding x, and eNB2 can
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66/179 designate pre-coding A, A, A, A, B and B for RBs 0 ~ 5 respectively. The latter can benefit from coordination between eNBs. That is, eNBs may need to coordinate their allocation of resource (s) to A-TX through the backhaul. If all eNBs maintain their resource allocation (s) from P-TX to A-TX, then coordination may not be necessary. If RB grouping of A-TX is used, eNB can notify the UEs so that the interference estimate and channel estimate can be more accurate.
[0121] In one embodiment, eNBs can coordinate with each other in such a way that eNBs transmit the polling signals on the same resources at the same time and in such a way that eNBs transmit real data at the same time after transmitting the signals polling. In particular, eNBs may need to coordinate with respect to polling resources (for example, establishing separate P-RS resources common to all eNBs). Such resources may include P-RS periodicity, subframe shift, P-RS locations within the subframe and / or maximum number of layers for the P-RS. Also, if RB grouping is to be used, all eNBs may need to establish the same grouping. Furthermore, if resource allocation (s) A-TX differs from resource allocation (s) P-TX, then resource allocation (s) may need to be coordinated among the eNBs. In some cases, eNBs can act as peers and exchange coordination information between themselves in a distributed manner. In other cases, one of the eNBs can be chosen to act as a coordinator. In other cases too, another entity in communication with the eNBs may act as a coordinator.
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[0122] The use of polling can increase overhead when compared to cases without polling. To help reduce the overhead for probing, some overhead can be minimized. For example, the overhead due to CRS can be minimized since P-RS is now used for link adaptation. The eNB can signal to legacy UEs that a subframe is a single frequency multicast-broadcast (MBSFN) network so that CRS needs to appear in the first OFDM symbol and nowhere else. The eNB can configure the UEs with measurements based on dedicated reference signal (DRS) and measurements not based on CRS and therefore CRS may not be transmitted. ENB can disable a carrier for legacy UEs and transmit DRS to new UEs. ENB can apply fast carrier on / off, and CRS can be transmitted only if the carrier is on for data transmission. EPDCCH can be used to replace PDCCH, so the UE does not need to rely on CRS. However, if EPDCCH is used, there may be a discrepancy between EPDCCH pre-coding on A-TX and polling pre-coding on P-TX. To resolve this issue, EPDCCH pre-coding can be used on P-RS equally, or eNB can ensure that EPDCCH for a UE is transmitted in the RB pool for the UE. Reducing CRS can also help to improve probing accuracy, since CRS is not pre-coded and, in certain embodiments, may not be probed.
[0123] Upon receiving the P-TX from its allocated resources, a UE can calculate the received channel quality, for example, SINR, using the same type of receiver as for data transmission later. If there is difficulty in deriving the quality of the channel received with receivers
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68/179 specific, for example, an ML receiver, because of the low density of the P-TX signal, the UE can apply parameters associated with a minimum mean squared error receiver (MMSE-IRC) in the calculation. Channel quality results can be used to report poll recommendations in different ways. In one mode, the UE can map the channel quality results to certain CQI values while also taking into account the difference in performance between a data demodulation receiver and a polling MMSE-IRC receiver. The network can then adjust the MCS on the A-TX transmission accordingly. In another mode, the network schedules initial data transmission. After the UE obtains the P-TX transmission channel quality estimate, the results are compared with the staggered transmission conditions. The UE can report the recommended MCS adjustment of the UE to the network, for example +1 or -1 from the initial stepped value.
[0124] To configure P-TX transmission, if there are UEs supporting different numbers of layers in the network, the network may need to make sure that the configuration can accommodate as many layers as possible in A-TX transmission. As an example, two UEs served by two eNBs, supporting 2 and 4 layers of data transmission, are active in the system and are pre-staggered in the same RBs of the two eNBs in the same subframe. The network can configure 4-port CSI-RS resources to transmit P-TX to the UE directing 4-layer data transmission and configure two 2-port CSI-RS resources to transmit P-TX to the UE directing 2-data transmission layers. The 2-port CSI-RS features can completely overlap with
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69/179 the 4-port CSI-RS features. P-TX signal transmitted on these two 2-port CSI-RS features can be different, but can still have the same pre-coding or can simply be repeated. In the previous case, the UE may or may not need to know the second 2-port CSI-RS resources for polling, but the UE may need to know the second 2-port CSI-RS resources for rate matching. In the latter case, the UE with the two 2-port CSI-RS resources can assume identical signals and pre-coding are used through the two 2-port CSI-RS resources (if signaled or specified). However, the P-RS in the same subframe of an eNB can have as many different layers as possible in different RBs (or RB groupings, etc.), as long as the P-RS in the same RB through neighboring eNBs is completely overlapping P resources -LOL.
[0125] In addition to a UE reporting recommended CQI or MCS adjustment values, the UE can also be configured to report a recommended transmission rating. Typically, classification is scaled before P-TX transmission and remains the same during P-TX and A-TX. After P-TX processing, the UE can discover favorable or unfavorable channel conditions for an impending A-TX if the same rating is maintained, but the UE can also report its favorite rating to the network. The reported rating may be higher or lower than the original staggered rating. The classification reporting format can be an absolute classification with an index or an offset from a staggered classification. For example, a UE can be staggered for rating 2 transmission and, by deriving the quality of
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70/179 channel of the P-TX, the UE can report to the network suggesting that the UE prefers transmission of classification 1 in the second layer. The network may or may not follow the classification suggested by the UE for the transmission of A-TX. If the network follows the UE's suggestion and changes the classification, some coordination may be necessary between eNB transmitters.
[0126] With the polling signal, the UE has a much better estimate of the actual interference experienced in data transmission. Therefore, the UE can target a lower block error rate than that of normal CSI reporting, which can target average channel and interference conditions such as, for example, 2% versus 10%. In testing EU reporting accuracy, a legacy test methodology and metric can be reused.
[0127] Link adaptation based on poll can be applied to several scenarios. For example, such an adaptation can be used for current LTE systems, with pre-coordination of polling and clustering resources, with P-TX signaling, and with additional operations to ensure that A-TX and P-TX are consistent. To help overcome the problem of fewer resources for P-RS interference estimation, RB grouping of a sufficient number of RBs can be used, which implies that polling can be especially effective on a broadband system (for example, hundreds of RBs in a carrier, which may be the case for C band, mmWave bands, etc.). The large RB cluster also implies that fewer UEs can be multiplexed in a subframe, but this limitation may not be an issue for a broadband system, especially for mmWave systems, which may have only a few multiplexed UEs. A system with
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Smaller TTI is also more suitable for polling as the polling delay can be reduced. Polling can also be used effectively for wireless backhaul transmissions for similar reasons. In addition, polling can significantly assist MU-MIMO transmissions, as married UEs can estimate their CQI, SINR and / or MCS more precisely after marriage. For this purpose, eNB can match UEs on common P-RS resources on P-TX, with pre-coding for UEs and tentative MCS levels for UEs. Then the UEs can be signaled with their sequences, layers and / or associated ports and matched layer information (in the case of non-transparent MU-MIMO) and can obtain their poll results. Then eNB can transmit on ATX to UEs married with updated MCS levels based on poll. In MU-MIMO polling, UEs matched in P-TX and A-TX can be consistent. Similarly, probing can be useful for CoMP, and the P-RS signals and their pre-coding can be from different (virtual) cells.
[0128] Probe configuration and configuration signaling from the eNB to the UE can include several items. Measurement process configuration can include, for example, several regular and / or polling processes and their IDs, antenna ports for regular and / or polling processes, and / or layers for regular and / or polling processes. Configuration of polling resources may include, for example, P-RS periodicity (which may not be present for aperiodic polling), P-RS subframe offset (which may not be present for aperiodic polling), RE P-RS locations, CSI-RS configurations, antenna ports for the sounding processes and / or layers for the
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72/179 survey processes. Probe signal configuration may include, for example, sequences for server cells, sequences for interfering cells, layers and / or ports of the signals from server cells and interfering cell signals, and / or MCS levels for the layers and / or ports signals from server cells and signals from interfering cells. Probe activation configuration can be based, for example, on pre-scheduling signaling, associated DCI information, temporary radio network identifier (RNTI), types of resource allocations and / or resource allocation granularity. Poll measurement setup may include, for example, signal measurement and time interference measurement, frequency, antenna ports and / or layer restrictions, including clustering if any. Reporting configuration may include, for example, periodic reporting via PUCCH, aperiodic reporting via PUSCH with associated time / frequency resources, and / or reporting one or more of the MCS, CQI, SINR, recommended IR, bit error rate ( BER), block error rate (BLER), frame error rate (FER), logarithmic likelihood ratio (LLR), ACK / NACK, MCS delta, CQI delta, SINR delta, delta classification, etc., for each unit frequency and / or for all specified resources, for each layer. Configuration of possible association of P-TX and A-TX can include, for example, displacement of subframe between P-TX and A-TX, P-TX and A-TX in the same CC or in different CCs (for carrier switching ), resource allocation ratio between P-TX and A-TX, and / or near-colocalization ratio between the antenna ports of P-TX and A-TX.
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[0129] Probing process modalities can significantly help to simplify retransmission and hybrid automatic repeat request (HARQ) functions, since the first transmission will often occur successfully. For example, the DCI can be changed in such a way that the New Data Indicator is by default new data or is even removed, and the New Data Indicator can be indicated only in the rare event that retransmission is required. The HARQ process ID can be treated in a similar way. The management of UE soft staging can also be simplified to handle essentially no retransmission. Complicated HARQ timing may not need to be maintained, especially for TDD systems.
[0130] 3GPP recently completed a study involving MIMO beam formation / high total dimensional (EBF / FD-MIMO). The study proposed to use the elevation dimension to improve the quality of service for cellular users in urban and / or dense implementation scenarios. One of the resources suggested in the study is a CSI-RS formed of bundles. Benefits of using beamformed reference signals include better EBF / FD-MIMO support with more antenna ports and improved signal estimation quality because of beamforming gains.
[0131] Figure 14 illustrates a procedure of modality 1400 for forming bundles of reference signals, according to certain modalities of this disclosure. In event 1402, UE1 and eNBl establish a radio resource control (RRC) connection, and in event 1404, UE2 and eNB2 establish an RRC connection. In the event
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1406, eNBl and eNB2 jointly decide common beam-forming reference signal configurations for both eNBs, such as periodicity and which REs are present in which subframes. The numbers circled in figure 14 indicate steps for which more details will be provided in figure 15. In event 1408, eNBl sets beam formation reference signals for UE1, and in event 1410, eNB2 sets formation reference signals bundles for UE2. In event 1412, eNBl sets up reporting of beamforming reference signal measurement to UE1, and in event 1414, eNB2 sets up reporting of beamforming reference signal measurement to UE2. In event 1416, eNBl decides about polling resources and a precoding vector (vl) in the beamforming reference signal, and in event 1418, eNB2 decides about polling resources and a pre-coding vector (v2) in the beamforming reference signal. In event 1420, the eNBl transmits the beamforming reference signal in the decided probe resources and transmits pre-scheduling signaling to the UE1, and in event 1422, the eNB2 transmits the beamforming reference signal in the decided probe resources and transmits pre-schedule signaling to UE2. Events 1420 and 1422 can occur at the same time. In event 1424, UE1 performs CSI measurements on flagged resources, and in event 1426, UE2 performs CSI measurements on flagged resources. In the event
1428, The UE1 reports a adjustment MCS for eNBl, and in event 1430, The UE2 reports a adjustment MCS for eNB2 . At the event 1432, The eNBl transmits DCI of staggering and a PDSCH of
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75/179 beamforming with the pre-coding vector vl and the MCS adjusted for UE1, and in event 1434, the eNB2 transmits scaling DCI and a beamforming PDSCH with the pre-coding vector v2 and the MCS adjusted for UE2. Events 1432 and 1434 can occur at the same time.
[0132] Figure 15 provides a more detailed modality with respect to the 1400 modality procedure for forming reference signal bundles that was illustrated in Fig. 14, according to certain modalities of this disclosure. Block 1502 provides details regarding event 1406 in figure 14, where eNBl and eNB2 jointly decide common beamforming reference signal configurations for both eNBs. In that event, eNBl sends a beamforming reference signal configuration request to eNB2 which may include a periodicity, such as 5 ms, a subframe offset with respect to, for example, a PSS subframe or subframe 0, and RE features. ENB2 then accepts the request, refuses the request, or requests a different configuration. Block 1504 provides details regarding event 1410 in figure 14, where eNB2 sets up beamforming reference signals for UE2. The configuration can include periodicity, subframe offset, RE resources, an associated physical cell ID / virtual cell ID (PCID / VCID), a power offset, an MCS reference signal and rate matching information. Block 1506 provides details regarding event 1414 in figure 14, where eNB2 configures the reporting of the beamforming reference signal. Reporting may be periodic reporting, aperiodic reporting based on a
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76/179 polling activation, subband reporting and / or broadband reporting. The configuration can specify report content, such as CSI, MCS, adjust MCS and / or RI. The configuration can also specify collision handling procedures. Block 1508 provides details regarding event 1430 in figure 14, where UE2 reports an MCS adjustment to eNB2. In this event, the UE2 can indicate the MCS level or the CQI (without PMI and with or without IR) or an MCS setting in relation to a polling MCS, such as a fixed MCS or an MCS indicated in a polling activation. Block 1510 provides details regarding event 1434 in figure 14, where the eNB2 transmits a scaling DCI and a beamforming PDSCH with the precoding vector v2 and the MCS adjusted for UE2. In this event, eNB2 transmits DCI to scale a PDSCH through a PDCCH or an EPDCCH. ENB2 can form bundles for EPDCCH DMRS and EPDCCH REs with the precoding vector v2. The level of CCE aggregation can be determined using a probed CQI / MCS. ENB2 then transmits the PDSCH and its DMRS with the precoding vector v2. The MCS level of the PDSCH is determined by the polled CQI / MCS. The PDSCH / EPDSCH RBs correspond to the probe RBs on which the probe MCS (for example, the beamforming reference signal measurement report) is based. For example, if beamforming reference signals are polled on RBs 5 and 8, and UE2 performs measurements and reports CQI / MCS based on RBs 5 and 8, then eNB2 can scale PDSCH on RBs 5 and 8 for UE2.
[0133] A CSI process can be configured with CSI class A reporting, CSI class B reporting or
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77/179 both. In Class A, a UE reports CSI according to the code book W = W1W2 based on {[8], 12,16} CSI-RS ports; this is basically legacy behavior. In Class B, a UE can report CSI of L ports, based, for example, on an indicator for beam selection and CQI / PMI / RI of L ports for the selected beam, where the total configured number of ports across all the CSI-RS resources in the CSI process is greater than L. Alternatively, the UE can report L port precoders from a codebook reflecting both beam selection and co-matching through two polarizations together, where the total configured number of ports in the process CSI is L. Alternatively, the UE can report a code book reflecting beam selection and CSI of L ports for the selected beam, where the total configured number of ports across all CSI-RS resources in the CSI process is greater than L Alternatively, the UE can report L port CQI / PMI / RI, where the total configured number of ports in the CSI process is L.
[0134] Beam selection by a UE constitutes a selection of a subset of antenna ports within a single CSI-RS resource or a selection of a CSI-RS resource from a set of resources. When a beam is selected and the index associated with the beam is sent by the UE, this can be referred to as a beam index (BI) report. However, since the beam actually corresponds to a particular CSI-RS resource (or resource configuration), what is seen and selected by the UE is exactly the CSI-RS resource (or resource configuration) associated with the beam. For this reason, BI can also be referred to as a CSI resource indicator (CRI) or something like that.
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[0135] Measurement restrictions for signal / channel measurements and interference (IM) measurements and methods for performing interference measurements in FD-MIMO will now be described.
[0136] Using interference measurement as an example, different CSI-IM REs (in time and / or frequency, or REs used for interference measurements) may experience different pre-coding weights. This is especially so that the pre-coding weights can be UE specific and vary in time / frequency. An interference measurement based on time domain and / or frequency domain interpolation and / or averaging corresponding to different pre-coding weights may not have any clear physical significance. A similar issue exists in signal / channel measurement. ENB can change its beam formation in the time / frequency domains, to different UEs, to support UE mobility, to adapt vertical sectors (which may have a special shape of virtual sectors, formed by different modes of beam formation analog / digital / hybrid / targeting 2D eNB antenna array), etc. Therefore, measurement restriction (MR) may need to be applied in the time and / or frequency domains (independently or dependent), and for signal / channel measurements and interference measurements (independently or dependent).
[0137] For a given CSI process, if MR in channel measurement is ON, then the channel used for CSI computation can be estimated from X NZP CSI-RS subframes up to and including a CSI reference resource. Measuring
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79/179 channel is derived from NZP CSI-RS. MR can be based on Li activation and / or higher layer signaling for a dynamic CSI request. For a given CSI process with CSIIM, if MR in interference measurement is ON, then the interference used for CSI computation can be estimated from Y CSI-IM subframes up to and including a CSI reference feature. Interference measurement is derived from CSI-IM. MR can be based on Li activation and / or higher layer signaling for a dynamic CSI request. If a CSI process can be configured without CSI-IM, for a given CSI process without CSI-IM, if MR in interference measurement is ON, then interference used for CSI computing can be estimated from V subframes up to and including a resource CSI reference number.
[0138] In a first alternative (Altl), fixed MR is ON or OFF via the highest layer configuration, and each of X and Y is fixed to a single value.
[0139] In a second alternative (Alt2), configurable MR is ON or OFF via higher layer configuration, and X = {OFF, 1, ..., NX] are higher layer configurable and Y = {OFF, 1, . . ., NY} are configurable to a higher layer.
[0140] In a third alternative (Alt3), CSI measurement is re-established periodically, where a re-establishment period and a subframe shift are configured at a higher layer. X is selected by the UE between 1 and Ζχ, where Ζχ is the number of CSI-RS subframes between the most recent measurement reset and the CSI reference feature. Y is selected by the UE between 1 and Ζγ, where Z _Y is the number of CSI-IM subframes between the reset
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80/179 latest measurement and CSI reference feature.
[0141] In the previous descriptions, X is the number of CSI-RS subframes used for a UE to perform signal / channel measurement averaging / filtering, and Y is the number of subframes used for a UE to perform averaging / filtering. interference measurement. If CSI-RS REs are used for IM, the subframes are CSI-RS subframes. If CSI-IM resources are used for IM, subframes are CSI-IM resource subframes. If CRS REs are used for IM, the subframes are subframes supporting CRS.
[0142] A CSI process is associated with K CSI-RS resources / configurations, for example, by definition in 3GPP TS 36.211, with Nk ports for the k-order CSI-RS resource (K can be> = 1). For class A and class B and all K values, MR is independently configurable for each set of subframes, when legacy measurement restrictions with two sets of subframes are also configured in a CSI process. An RRC parameter for channel measurement (for class B) and an RRC parameter for interference measurement (for classes A and B) are provided to enable or disable MR. MR can be applied for CSI reporting both periodically and aperiodically or only for aperiodic reporting (for example, with MR never enabled for periodic reporting). For class A and class B with K = 1, Altl (with X = Y = 1) is supported. For class B with K> 1, Altl (with X = Y = 1) or Alt3 can be implemented, with the understanding that existing RRC parameters (for example, the recovery period is equal to the BI period and the offset is fixed) can be reused for Alt3, and aperiodic reinstatement consideration is also not
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[0143] Alt3, where CSI measurement is re-established periodically or aperiodically, is now described in more detail.
[0144] Figure 16 illustrates an example of Alt3 1600 from the point of view of a UE, according to certain modalities of this disclosure. Signal measurement is shown in the figure, but interference measurement can be done in a similar way. For simplicity, most descriptions assume that the measurement reset is performed periodically and according to the BI reporting period and reporting. However, the procedures can be easily generalized for cases with aperiodic restoration and / or according to some activation signal (which can be independent for signal / channel measurement and interference measurement).
[0145] A BI 1602 period begins in subframe 1604 where the UE reports BI1 and ends in subframe 1606 where the UE reports BI2. The UE can receive BI periodicity information (or duration, along with subframe offset) indicated in subframes 1604 and 1606 where the UE reports Bis. The UE assumes that the CSI measurement reset period is the same as the BI 1602 period, potentially with an offset 1608 from the BI 1604 reporting subframe. Offset 1608 can be specified. A 1610 reset period can be the same as the BI 1602 period. The new BI (for example, BI1) starts to be applied in DL transmission / reception in a 1612 subframe later than the BI1 report, and the UE restores its measurement process CSI in this 1612 subframe. The UE selects an X 1614 value
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82/179 between 1 and ο Zx 1616, where Zx 1616 is the number of CSI-RS subframes between measurement reset subframe 1612 and reference feature 1618. The two CSI reporting instances 1620 and 1622 are shown. For the first instance 1620, the Zx 1616 is smaller, while the Zx 1616 is larger for the second instance 1622. The same X 1614 value or different X values 1614 can be selected by the UE. BI2 can be applied to DL transmit / receive in a 1624 subframe later than BI2 reporting.
[0146] The benefits of Alt3 include greater measurement accuracy, as more averaging is applied to the measurement process for the same characteristic. For example, in a network with time-varying bundling (as opposed to time-varying bundling) within each BI period, the UE can perform averaging across the subframes within each BI period, and this can result in greater measurement accuracy.
[0147] The value of X may not need to be specified. From the UE perspective, the UE may need to know only when the restoration will be performed and where the reference resources are located.
Based in these values, The EU knows Zx, and the EU can select flexibly X consequently and so autonomous. The X value can to be the same or different for the respective Zx, and can to be same or different to
respective recovery period, etc. Furthermore, the EU filtering behavior can be similar to the legacy filtering behavior (which has no measurement restriction) except for an occasional measurement reset. Therefore, the way in which filtering is done is a
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83/179 EU implementation issue. That is, mention of X is not necessary and it may be sufficient that the UE can reestablish its measurement process according to the resynchronization timings. This also helps to minimize impact.
[0148] An UE can support at least three types of behavior.
[0149] An example of a first behavior involves Altl (with X = Y = 1), where the measurement is restricted based on only one subframe. This alternative is suitable for cases with dynamic beam formation or cases where the UE may not have sufficient knowledge as to how or when the beam formation of server or interfering eNB is changing. This alternative provides the highest flexibility for the network to adapt the beam formation while not significantly increasing the signaling overhead.
[0150] An example of a second behavior involves Alt3 (measurement reset), in which the measurement process is reset according to a network indication or activation, for example, through BI reporting. This alternative is suitable for cases with semi-static beam formation or cases where the UE has sufficient knowledge about the subframes in which beam formation remains constant or cases where longer term measurement is useful (for example, in interference measurement for a BI reporting). This alternative can offer higher measurement accuracy than Altl.
[0151] An example of a third behavior is without measurement restriction (for example, legacy measurement behavior). This is already supported and used for legacy measurements,
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84/179 such as CSI-RS based on non-precoded CSI.
[0152] It may be preferable for Altl (for example, a subframe measurement constraint (that is, with X = Y = 1)) to be supported. Alt3 can also be considered in order to provide more options for network / UE operations, which can achieve different tradeoffs between flexibility for changing beam formation and measurement accuracy.
[0153] To conclude, a UE can support Altl (with X = Y = 1) and Alt3 (restoring measurement) for Class B with K> 1. For Alt3 (measurement reset), only the reset event and instant may need to be specified, for example, BI reporting, and other parameters can be left for the UE implementation.
[0154] Restoration can be linked with BI reporting, potentially with an offset. BI reporting can be periodic or aperiodic. In the aperiodic case, BI reporting can be activated through signaling in the PHY layer. Signaling can be used to activate only BI reporting, or BI + IR (since both are long-term measurements), or BI + IR + CQI (there may not be a PMI associated with the CSI process), or BI + IR + CQI + PMI. Activation can specify which measurement quantities are reported and which measurement quantities correspond to which BI (old BI or new BI) and / or IR. Alternatively, activation can specify merely which CSI processes are to be reported, and the associated reporting quantities can be configured via RRC. Alternatively, the activation signal may not be a new signal, and the existing aperiodic activation for IR may be
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85/179 reused instead if class B reporting is configured. Alternatively, the reset can be linked to IR reporting, BI reporting and IR reporting, a new activation signal that is unrelated to BI reporting, but used for signal restoration / interference purposes, or a combination of these options. The network can configure and support these operations.
[0155] Restores for signal measurement and interference measurement can be activated by the same event or signaling, such as BI reporting. In this case, eNBs can coordinate their adaptation of beam formation in CSIRS and / or data (or other adaptation such as on / off) so that eNBs adapt at the same time. If such activation is considered to be restrictive, separate reset activations can be used for signal and IM measurement. For example, a UE may be in a sector with an interfering sector changing its pre-coding every 80 subframes, and the server sector of the UE may be changing its pre-coding every 240 subframes. In a case like this, the signal measurement may be reestablished every 240 ms, but the IM may need to be reestablished every 80 ms. In other words, it is possible that whenever a dominant interferer adapts its transmissions and causes a different interference condition, signaling can be sent from the server sector to the UE for IM restoration.
[0156] Between BI reporting and BI application (for example, the UE measurement reset time), there may be an offset measured as a number of subframes. This shift is likely to be four subframes, since eNB can use about four subframes
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86/179 to process and prepare for switching and also considering the difference in timing between UL and DL. Alternatively, the displacement can be signaled to the UE, as in RRC signaling for MR configuration, or in Li activation.
[0157] If CSI or part of CSI is activated to be reported with BI, especially in K> 1 cases, there may not be enough time for the UE to generate the CSI measurement results associated with the new BI. One technique that can be adopted to address this issue is to allow greater latency for BI reporting after activation. That is, the UE can wait until after the reset (for example, BI reporting time + reset offset) and then report CSI associated with the new BI. Another technique that can be adopted to address this issue is the UE reporting CSI associated with the old BI instead of the new BI. That is, before the reset, the UE can still base its calculation and CSI reporting on the old BI. For periodic BI reporting, this issue may be less important, so the UE may be able to report CSI associated with the new BI. However, in order to decrease UE complexity, it may still be desirable to report CSI associated with the old BI until reinstatement.
[0158] Interference measurement will now be considered. Interference measurement approaches include interference measurements with CSI-IM resources (also known as IMR) and interference measurements without CSI-IM resources.
[0159] For interference measurements with configured CSI-IM, there may be one or more CSI processes (for example, CoMP) for a UE, and each CSI process can be
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87/179 configured with CSI-RS and CSI-IM. The associated mode of transmission can be TM10 or its further evolution. A CSI process can be associated with one or more CSI-RSs and with one or more CSI-IMs. For simplicity, the description can be directed mainly to a CSI-RS / CSI-IM per CSI process, and can be applied in a similar way for cases with multiple CSI-RS / CSI-IM per CSI process. There are two cases when CSI-IM is configured, including the CSI-IM covered and not covered by ZP CSI-RS resources of eNBs and / or adjacent virtual sectors.
[0160] Figure 17 illustrates an example of resources 1700 for CSI measurements in a case where CSI-IM is not covered by ZP CSI-RS resources from adjacent eNBs, according to certain modalities of this disclosure. For a case like this, adjacent eNBs do not configure ZP CSI-RS in the time / frequency resources corresponding to the CSI-IM of the UE, and coordination of eNB in CSI-IM REs may not be appropriate.
[0161] The interference perceived in CSI-IM REs by the UE in general can be equal to the interference being perceived in non-CSI-IM REs. Such interference reflects the current interference being experienced by the UE and may not reflect prospective interference that the UE may be experiencing; especially if the interfering virtual cells or sectors are changing their beam formation and when interference measurement is used for link adaptation in subframes later.
[0162] In figure 17, there are 16 CSI-RS REs per eNB, that is, 4 REs for signal, 8 REs for obscuring adjacent eNB signals, and 4 REs for CSI-IM. In the case of virtual sectors (for example, each 'eNB' is actually a sector
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88/179 virtual, and the virtual sectors are actually controlled by the same eNB), a UE may need to be configured with all CSI-RS / CSI-IM and can perform rate matching with them, which corresponds to 24 REs in the total.
[0163] Figure 18 illustrates an example of 1800 resources for CSI measurements in a case where CSI-IM is covered by ZP CSI-RS resources from adjacent eNBs, according to certain modalities of this disclosure. In particular, the eNBO 1802 CSI-IM overlaps with the eNBl 1804 and eNB2 1806 ZP CSI-RS. The interference measured by the eNBO UE on the CSI-IM is what the eNBl 1804 and eNB2 1806 transmit on that CSI ZP -RS, which may not be the same as the PDSCH transmissions of eNBl 1804 and eNB2 1806 and which in general may need to be matched in fee by UEs associated with eNBl 1804 and eNB2 1806.
[0164] For the case illustrated in figure 18, adjacent eNBs may need to configure zero-power CSI-RS in the time / frequency resources corresponding to an UE CSIIM, and their transmissions in those resources may need to be consistent with the coordinated transmission assumptions . As a result, these ZP CSI-RS features may not be used for data transmissions by adjacent eNBs (for example, rate matching may be required).
[0165] It can be noted that ZP CSI-RS may or may not be obscured. If it is assumed that the eNBl 1804 CSI-IM is covered by the eNBO 1802 ZP CSI-RS and further assumed that eNBO 1802 serves UE0 and eNBl 1804 serves UE1, then, from the perspective of UE0, UE0 exactly performs rate matching with REs ZP CSI-RS. Then the eNBO 1802 can obscure or transmit signals according to
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89/179 with a coordinated hypothesis in the REs ZP CSI-RS, and in the latter case the signals transmitted by eNBO 1802 are seen by UE1 as interference in CSI-IM. Therefore, ZP CSI-RS here is a mechanism to provide eNBs with the flexible ability to measure interference according to a certain transmission hypothesis.
[0166] The perceived interference in CSI-IM by the UE may not be directly related to the perceived interference in non-CSI-IM REs (for example, data REs). Depending on how eNB coordination is done, such interference may reflect the prospective interference that the UE will experience. That is, in an adjacent eNB ZP CSI-RS, transmissions can occur according to a transmission hypothesis determined by the network, and the hypothesis can be applied to actual transmissions from several subframes later.
[0167] In figure 18, there are 24 CSI-RS REs per eNB, that is, 4 REs for signal, 8 REs for obscuring adjacent eNB signals, 8 REs for transmissions for interference measurements of the adjacent cell UE, and 4 REs for CSIIM. A UE may need to perform fee matching against at least these 24 REs.
[0168] Evolution of TM10 (or potentially a new transmission mode) and / or interference measurements based on CSI-IM may be required in Release 13 to efficiently support FD-MIMO. In addition, the following improvement, that is, measurement constraint, can be considered.
[0169] If CSI-IM is to be used for an UE operating on EBF / FD-MIMO and the CSI-IM is covered by a ZP
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CSI-RS of the adjacent eNB, different CSI-IM REs (in time and / or frequency) may experience different pre-coding weights. This is especially so that the pre-coding weights can be EU specific and can vary in time / frequency. Interference measurement based on interpellation and / or averaging in the time domain and / or frequency domain of corresponding different precoding weights may not have any clear physical significance. Therefore, measurement constraint may need to be applied in the time and / or frequency domains. However, if the CSI-IM is not covered by an adjacent eNB CSI-RS ZP, which is generally associated without eNB coordination, measurement restriction may not be applicable. Therefore, measurement constraint for interference measurements may be more relevant if the CSI-IM is covered by a ZP CSI-RS from the adjacent eNB than if it were not.
[0170] In another approach, interference measurements may not have CSI-IM configured. This approach is applicable for any non-CoMP scenarios, which may be typical scenarios for FD-MIMO. For this approach, the CSI process is configured without CSI-IM, and the associated transmission mode can be any but TM10, such as TM9 or its extension (3GPP TS 36.213 V12.7.0 R12 (2015-09), the which is incorporated into this document by reference as reproduced in full states in Clause 7.2.1 where For a given server cell, if the UE is configured in transmission modes 1-9, the CSI process in Table 7.2.1-1B and Table 7.2.1-1C refers to the aperiodic CSI configured for the UE in the given server cell.
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Therefore, TMs 1-9 can be seen as also having the concept CSI processes defined). Interference measurements can be performed on CSI-RS REs or CRS REs. Performing interference measurements on CSI-RS REs may be preferred. The following description assumes that interference measurements are made on CSI-RS REs.
[0171] Figure 19 illustrates the CSI 1900 measurements without CSI-IM and with CSI-RS overlap, according to certain modalities of this disclosure. A UE first detects the signal in the CSI-RS REs and then subtracts that signal from the total received signal to obtain an interference estimate. More steps for interference measurements are involved in this case than with CSI-IM; however, a capability like this can already be supported by the UE for CRS-based interference measurements. For this example case, the overhead is four REs (for CSI-RS) per eNB, and the UE performs rate matching with these four REs.
[0172] That is, in one mode, a plurality of eNBs transmit reference signals in overlapping REs. In particular, a plurality of eNBs transmit the reference probe signal or P-RS described in this document on REs specified for use for NZP CSIRS. Since the reference signals overlap, a UE can perform measurements of both signal and interference on the same resources. Such a scheme can have less overhead than if separate REs were used for signal and interference and can also improve measurement accuracy. Transmissions overlapping eNBs can be distinguished from each other by having different scrambling IDs or scrambling sequences.
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[0173] It is also possible to allow CSI-RSs to be non-overlapping for eNBs, but an approach like this may not bring any benefit and can capture only current interference rather than potential future interference (since the pre encoding in the CSI-RSs of an adjacent eNB can be used in transmissions later by the adjacent eNB; therefore, the pre-coding weights may be able to reflect potential future interference).
[0174] This approach can also allow the CSI process to have multiple CSI-RSs. The interference measurement features for each CSI-RS are the CSI-RS REs.
[0175] It can be thought that the accuracy of interference measurement without CSI-IM can be reduced, mainly because of the need to first estimate and subtract CSI-RS signals (without obscuring RE) before obtaining the interference estimate. However, analysis can reveal that measurement accuracy is not an issue.
[0176] First, obscuration of ER, when introduced, was applied primarily for measurements of weak signals in CoMP. Obscuration of ER in general is not necessary for non-CoMP since the signals are typically strong enough. Second, using the previous example, the number of REs used in interference measurement can be compared to the number of REs when demodulation using DMRS is performed. In the case of DMRS, there are 12 REs per RB. In the previous example, there are 4 REs per RB. However, with appropriate interpolation / averaging and measurement constraint (for example, 3 or 6 RBs per feedback granularity), in general
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CSI-RS REs from multiple RBs can be used. In this way, the accuracy of CSI-RS measurements can match at least the appropriate accuracy for demodulation, however sufficient measurement accuracy can be achieved at the cost of more operations in interference measurements. In addition, the accuracy can also be increased because of beam formation gain since CSI-RS is pre-coded in EBF / FD-MIMO. Therefore, measurement accuracy without CSI-IM may not be a concern.
[0177] Similar to CSI-IM-based interference measurements, it may also be important to introduce appropriate measurement restrictions in the time / frequency domain for non-CSI-IM based interference measurements. Therefore, CSI-RS REs can be used for interference measurements with sufficient measurement accuracy, and interference measurements performed on CSI-RS REs can be improved through measurement restriction.
[0178] Table 1 compares the three interference measurement mechanisms described previously.
Table 1
ResourceIM Measured interference Overload Coordination requirement MR requirement A: CSI- IM REs Interference Average/ No No noCSI-IM gift highapplicable covered per ZPCSI-RS of
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adjacent eNBB: CSI-IM covered by ZPAdjoining eNB CSI-RS REsCSI-IM Interferenceprospective High Yes Yes Ç:NoneCSI-IM CSI-RSREs Interferenceprospective Low No Yes
[0179] It can be seen that, in certain scenarios, mechanism C may be an appropriate choice for FD-MIMO, however this disclosure considers using other mechanisms if appropriate.
[0180] It can be noted that mechanism B can encompass mechanism C if CSI-IM is allowed to override CSI-RS, with appropriate UE behavior clarified. More specifically, the following potential unification solution can be adopted.
[0181] First, the UE is configured with an NZP CSIRS. The UE can be additionally configured with a CSI-IM that overlaps the CSI-RS (for, for example, TM10 or its evolution), or without CSI-IM (for, for example, TM9 or its evolution). Second, the UE performs signal / channel measurements based on the NZP CSI-RS. Third, the UE cancels NZP CSI-RS in NZP CSI-RS REs, in such a way that only interference is left in those REs. Fourth, the UE performs interference measurements on those REs.
[0182] Therefore, by allowing measurement of
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95/179 interference in NZP CSI-RS REs and adopting the UE behavior indicated above, the benefits associated with mechanism C can also be achieved by mechanism B. In a case like this, the behavior of UE in mechanisms B and C becomes makes it the same, which can simplify the standardization effort. If multiple NZP CSI-RS are configured on overlapping REs (for example, for multiple virtual sectors), then the UE may need to perform the second and third steps outlined above for each NZP CSI-RS. For example, if the UE is configured with three NZP CSI-RSs associated with three different virtual sectors on the same REs, the UE can detect each of the three NZP CSI-RSs for signal / channel measurements and obtain the three Si, S2 transmissions and S3 (combining pre-receptor or post-receptor). Then the UE subtracts the first NZP CSI-RS signal from the signal received in the REs, obtaining the interference estimate II associated with the Si transmission. The Si and II ratio plus noise (with appropriate combination applied, if any, and in the domain of power) is then the SINR associated with the Si transmission. Other SINRs can be obtained in a similar way. Also, other quantities of measurements including, but not limited to, CQI, CSI, PMI, RI, BI and RRM measurements can be obtained.
[0183] To conclude, NZP CSI-RS REs can be used for interference measurements. UE's behavior may need to be clarified in a case like this. These concepts can be applied to two cases: TM10 or its evolution, with a CSI-IM that overlaps with the CSI-RS, and TM9 or its evolution, without configured CSI-IM.
[0184] A method of modality for signaling
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96/179 downlink on a wireless network includes signaling to an UE an index of a CSI-IM resource, CSI-RS resource or CQI report / CSI process, together with a timing and / or a period of time, in which the UE measures and feeds back based on the resources associated with the indexes and timing, the UE takes on a new measurement condition for the CSIIM resource, CSI-RS resource or CQI report / indicated CSI process that will be in effect since the indicated timing and / or according to the indicated time period, and eNB adapts its transmissions (for example, pre-coding, obscuring or non-obscuring) based on the CSI-IM resource and / or CSI-RS resource indicated according to the timing and / or indicated timing period.
[0185] A modality of a method for backhaul signaling on a wireless network is revealed that includes signaling for a second eNB of a CSI-IM resource and / or CSI-RS resource, together with synchronism and / or a period of time, the second the eNB sends a DL signaling to a UE. Another modality of a method for backhaul signaling on a wireless network is revealed that includes signaling for a second eNB of a CSI-IM resource and / or CSI-RS resource, along with the same timing and / or a period of time , in which the second eNB sends a DL signaling to a UE.
[0186] A method of modality for backhaul signaling on a wireless network includes signaling to an eNB of a CSI-IM resource and / or CSI-RS resource, together with a synchronism, in which several eNBs adapt their PDSCH transmissions (for example example, pre-coding, obscuring or non-obscuring) according to the streams in the resource
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CSI-IM and / or CSI-RS resource indicated in the indicated timing, and the eNBs signal to UEs to interrupt the measurements and feedback according to the timing. In any case, if the synchronisms are signaled, the synchronisms can be signaled once at the beginning of the polling process (for example, a sequence of synchronisms of tO, ti, ..., tk with a predetermined k), or signaled at over time when needed.
[0187] In a modality method, the synchronism exchanged by eNBs and / or the synchronism exchanged between eNBs and UEs are not present. This mode has the benefit of less signaling overhead. However, the poll can become longer in time and more likely to fluctuate. On the other hand, timing can be predefined or partially predefined so that signaling about timing does not have to be used or a simplified signaling about timing can be used. This way the signaling overhead can be reduced.
[0188] Several modalities of this disclosure provide systems and methods for measuring channel in a wireless network. In particular, a method and system for measuring interference from a channel on the wireless network is provided.
[0189] Performance on a wireless network can refer to QoS measurements and can be indicated by different ways of measuring QoS. For example, the QoS, and thus performance, of the wireless network can be indicated when measuring the width bandwidth, throughput, latency, jitter, error rate, and other appropriate network metrics. As a particular example, an error rate can be counted based on the number of bits received from a data transmission in
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98/179 a communication channel that may have been changed because of noise, interference, distortion or synchronization during transmission. Among the factors that can cause alteration of a data transmission, interference can be a fundamental issue. Interference can refer to anything that can interrupt or otherwise modify a signal as it travels along a channel between a transmitter and a receiver in a communication process. For example, interference can include, but is not limited to, noise, distortion or other factors. In certain embodiments, interference refers to the addition of unwanted signals to a useful signal. Interference measurement (IM) can be important for resource management, including reducing and controlling channel interference.
[0190] A method for adapting to a wireless network may include a first base station signaling information from a first set of resources to a first UE and / or a second base station, and the second base station signaling information from a second set resources for a second UE and receive feedback from the first and second UEs for the resource pools. The method includes the first base station signaling a first sync to the first UE and / or the second base station, and the second base station signaling the first sync to the second UE and receiving feedback from the first and second UEs on the sets of resources according to the first timing. The method additionally includes the first base station transmitting a first signal in a first subset of the first set of resources according to the first synchronism, and the second base station transmitting
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99/179 a second signal in a second subset of the second set of resources according to the first timing and receiving feedback from the first UE regarding the first transmitted signal, the first set of resources and the first timing. The method further includes the first base station transmitting a third signal in a third subset of the first resource set according to the first timing, the second base station transmitting a fourth signal in a fourth subset of the second resource set according to the first timing, the first base station signaling a second timing to the first UE or the second base station, and the second base station signaling the second timing to the second UE and receiving feedback from the UEs according to the second timing after the UEs interrupt measurements .
[0191] The resource set can be a resource block that includes a set of REs. In certain modalities, an RE can be defined by a time and frequency resource within a subcarrier and an OFDM symbol. For example, twelve subcarriers in a time span can form a resource block.
[0192] A method for downlink signaling on a wireless network may include a UE receiving an indexing signal from a CSI-RS resource, a CSI-IM resource, a CQI report or a CSI process from a base station. with a timing. The method additionally includes measuring and sending feedback to the base station according to the indexed resource and the timing, assuming a new measurement condition for the indexed resource
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100/179 will be in effect according to the timing, and receive transmissions adapted from the base station on the CSI-IM resource and / or CSI-RS resource indexed according to the timing.
[0193] Capacity power can operate at zero power (ZP) or non-zero power (NZP) for a channel on a network. A node can cost power to stay ON to monitor transmissions from other nodes on a network.
[0194] Frequently interference measurement is done when a channel's capacity power works in ZP. A channel can transmit data when the channel's capacity power works in NZP. In certain embodiments, it may be beneficial for interference measurement to be performed in association with data transmission (for example, when a channel's capacity power works in NZP). And in so doing, more information can be collected for resource management to reduce and control channel interference.
[0195] For example, interference measurement can be performed on more than two REs, and IM values of more than two REs can be obtained. An average value of the obtained IM values can be calculated, which can provide a reference for the interference estimate. Additionally or alternatively, all IM values can be collected and added together to have a complete transmission quality reference number. Additionally or alternatively, a part of the IM values can be collected and added to generate a transmission quality reference number. Additionally or alternatively, both average value and addition
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101/179 relative to a plurality of IM values can be generated for similar purpose. Such solutions can be implemented from the perspective of an UE or a network.
[0196] Several modalities of CM and IM are described below.
[0197] A general guideline for configuration for channel measurement (CM) and IM can be as follows. A set of non-zero power CSI-RS (NZP) features is configured for a UE for channel and interference measurements, and a set of ZP CSI-RS features is configured for the UE for IM. A subset of the NZP CSI-RS feature set is configured for channel measurement. Another subset of the NZP CSI-RS feature set and a subset of the ZP CSI-RS feature set are configured for interference measurement. The wireless network indicates, via DCI or a combination of MAC and DCI, the NZP CSI-RS resource subset for channel measurement, and the NZP CSI-RS resource subset and the ZP CSI-RS resource subset for measurement interference. In some embodiments, the DCI indication can be a dynamic activation of one or more CSI reporting configurations. In some embodiments, some CSI-RS resources from two subsets of NZP CSI-RS resources may overlap.
[0198] In certain embodiments, the UE can assume that each port of a NZP CSI-RS channel measurement feature corresponds to a desired interference transmission layer if PMI and RI feedback is not configured or indicated. In some embodiments, a UE may assume that each interference measurement port on an NZP CSI-RS resource corresponds to a certain transmission layer.
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102/179 interference if the NZP CSI-RS feature for IM is not overlapped with the NZP CSI-RS feature for CM. There may be multiple ways to specify UE behavior and / or UE assumptions. As a first example, the operations that the UE performs can be specified directly. As a particular example of directly specifying the operations to be performed by the UE, the operations specified directly can be as follows: the UE extracts interfering signals on each NZP CSI-RS resource for IM as a first step, and the UE adds the interfering signals applying weights as a second step and so on. Thus, in certain modalities, the UE may not need to execute the UE assumptions, or the UE assumptions need not be standardized, but the behavior of an UE may be standardized. On the other hand, assumptions of a UE can be provided based on which the UE can have sufficient information to operate. Assumptions of a UE can infer the behavior of the UE, and vice versa.
[0199] The interference transmission layer referenced above can also be referred to as an interference layer, layered interference, an interference transmission layer, a precoded / beam-formed interference, a flow of an interferer, a flow of interference, an interference transmission stream, and so on. In certain embodiments, the interference transmission layer is similar to a transmission layer (eg, flow) from a server network point, but in the case of an interference transmission layer, the transmission (eg, flow) is intended for another recipient and consequently this
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103/179 layer becomes interference for an interfered UE. In other words, when a network point transmits a stream (for example, via pre-coding or forming MIMO beams) to a served UE, this stream becomes an interference transmission layer for another UE not intended to receive the flow message. If legacy CRS-based ZR IMR or IM is used for IM, the interference transmission layer may be mixed with other interference and may not be seen by the UE (for example, the UE has no
information a respect of this layer, but can to see interference aggregate). With NZP IMR, the UE can Tue information and capacity enough for see layer in
interference transmission. In certain embodiments, each interference transmission layer is associated with an interference transmission signal and an interfering channel. As examples, each layer in H _k WiSi of Y _k = HkW _k S _k + Y ^ kHfrWiSi + I _k + n _k (see below) is an interference transmission layer, and each layer in Hi Si and H2 S2 in Y = HsS + Hi Si + H2 S2 + 10 (see below) is an interference transmission layer. Each port on the NZP IMR can correspond to an interference transmission layer.
[0200] In an NZP CSI-RS resource that is for channel measurement, the UE can assume that its desired signal (s) is (are) transmitted. That is, the NZP CSI-RS resource to be
used by the UE to CM is transmitted in wake up with configuration / indication in network, including, per example, ID scrambling,layers / doors,CDM, Praça ('powerControlOffset', or EIRP ratio between an energy in
NZP layer in an RE and PDSCH energy in an RE), etc. In certain embodiments, no additional assumptions need be made.
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104/179 made by the UE. Consequently, the UE can extract each of the NZP signal layers on the associated port using the scrambling ID and CDM port mapping information, and assume that the signal is enhanced by P _c as it is signaled. In certain embodiments, the power boost is removed by forming an Hs channel matrix in such a way that Hs corresponds to the actual PDSCH transmission power. For NZP CSI-RS, the following RE patterns can be considered. The RE standard for an X port CSI-RS resource includes one or multiple component CS CS-RS standards. The standard CSI-RS RE component (Y, Z) can be defined within a single PRB as Y REs adjacent in frequency and Z REs adjacent in time. In NR, CDM 1, 2, 4, 8 are supported for NZP ports 1, 2, 4, 8, 12, 16, 24, 32. CDM in the frequency domain, CDM in the time domain and CDM in the F domain / T can be supported.
X Density[RE / RB / door] N (Y, Z) CDM 1 > 1, 1, 1/2 1 AT. Without CDM 2 1, 1/2 1 (2.1) FD-CDM2 4 1 1 (4.1) FD-CDM2 8 1 1 (2.1) FD-CDM2 8 1 2 (2.2) FD-CDM2, CDM4 (FD2, TD2) 12 1 1 (2.1) FD-CDM2 12 1 2 (2.2) CDM4 (FD2, TD2) 16 1, 1/2 2 (2.2) FD-CDM2, CDM4 (FD2, TD2) 24 1, 1/2 4 (2.2) FD-CDM2, CDM4 (FD2,TD2), CDM8 (FD2, TD4) 32 1, 1/2 4 (2.2) FD-CDM2, CDM4 (FD2,TD2), CDM8 (FD2, TD4)
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[0201] The following provides two examples of how NZP can be used for IM:
In one embodiment, a first type of how NZP can be used for IM is illustrated when an NZP CSI-RS signal is based on IM. In this case, information about the interfering NZP CSI-RS signal, such as the scrambling ID, doors / layers, power boost value, etc., is signaled to an interfered UE, and the interfered UE performs IM based on signaled information and NZP CSI-RS signal received.
In one embodiment, a second type of how NZP can be used for IM is illustrated when an NZP CSI-RS resource is based on IM. In this case, the interfering NZP CSI-RS signal information may or may not be signaled to the interfered UE, but at least the NZP resource information is signaled to the interfered UE, so that the interfered UE knows what resources (for example , REs) must perform IM. The UE can use part of the NZP CSI-RS signal information (if signaled) in IM.
[0202] In certain embodiments, the first type of NZP-based IM (for example, when an NZP CSI-RS signal is based on IM) may have a more accurate estimation advantage of dominant interference, such as when estimating the matrix of interfering channel H from the nearest interfering (e.g., the nearest interfering UE) and possibly performing advanced receiver-related operations. In some scenarios, however, problems remain to be resolved to improve the first type of process. First, when the UE extracts the NZP CSI-RS signal for IM, the UE behavior may involve operations
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106/179 advanced receiver-related. For example, CSI can be derived with the extracted interfering channel matrix, non-dominant interference plus noise can be estimated (as obtained in a ZP for IM, or in this NZP CSI-RS resource with discounted NZP CSI-RS signal). Second, when the UE does not extract the NZP CSI-RS signal for IM, the UE can obtain interference energy / power in the NZP CSI-RS resource. In this scenario, the second type process, in some situations, may perform better than the first type process. In this case, the assumption and behavior of the UE may be different from those of scenarios when the signal can be extracted.
[0203] There may be multiple reasons why the UE is unable to extract the interfering NZP CSI-RS signal. Such reasons may include limited UE capacity, insufficient (but not negligible) interference intensity or other suitable reasons. Interference power may be low, such as because of interference and escape coordination, orthogonal pilots / RS or other reasons. In multi-user (MU) operation, users are often spatially separated (for example, users are associated with different spatial pre-coding), and the bundling for UE1 can be largely separated from the bundling for UE2 or even almost orthogonal to it. Because of the formation of beams in a network, the interference that an UE experiences may appear more fragile than that CSI-RS targeted in the UE itself. In some scenarios, a lower channel performance estimate may make such an operation unworkable.
[0204] The second type of how NZP can be used to
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IM (for example, when an NZP CSI-RS resource is based on IM) can have an advantage in that information such as interfering signal scrambling ID, ports / layers, power boost value and other appropriate information may not need to be transmitted to or used by the UE. Two example cases are described below:
Example case 1: IM is obtained after extracting a server signal. In this case, the server signal overlaps, at least in part, the interference measurement (IMR) feature. After the server signal is extracted, the remaining energy / power in the NZP resource REs is used to obtain IM.
Example case 2: IM is obtained in the IMR without extracting a server signal. In this case, IMR REs contain only interference, and the UE can estimate the energy / power in IMR REs to obtain IM. The assumption and behavior of UE in this feature may be more advanced than in ZP-based IM, which will be described later.
[0205] Modalities for IM based on ZP CSI-RS are provided. There are some example cases. In a first example, IM is based on a ZP CSI-RS. On the network side, ZP-based IM for a cell can be overlaid with data transmission from one or more neighboring cells. The ZP-based IM in this example may reflect a current interference condition, but it potentially does not reflect a future condition or a prospective interference condition. The UE can perform IM on the ZP CSI-RS by measuring the energy / power on the ZP CSI-RS REs.
[0206] Figure 20 shows an example 2000 case for IM based on ZP CSI-RS, according to certain
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108/179 modalities of this revelation. Four REs 2002 (RE 2002a, RE 2002b, RE 2002c and RE 2002d) from the ZP CSI-RS are shown that can obtain four IM values (IM1-IM4). In certain embodiments, the UE assumes that the interference conditions in the four REs 2002 are the same, and determines an interference value (I) when performing an averaging operation based on at least the four IM values. For example, the UE generates I = (IM1 + IM2 + IM3 + IM4) / 4. There may be multiple sets of 4 REs 2002 for the ZP CSI-RS, and 2002 REs across multiple sets may have the same IM measurement constraint condition. In certain modalities, the UE assumes that the interference conditions in all 2002 REs are the same, and determines an interference value (I) when performing an averaging operation with all such 2002 REs.
[0207] Additionally or alternatively, on the network side, the ZP-based IM for a cell can be overlaid with RS transmission (s) from one or more neighboring cells. The RS transmission from a neighboring cell can include NZP CSI-RS, DMRS or other suitable RS transmissions. ZP-based IM reflects current or future interference conditions depending on whether RS is used for current data transmission or future data transmission. In figure 20, NZP is transmitted by the neighboring cell, and each RE 2002 is associated with a layer (for example, no CDM for NZP, and each RE 2002 is for a layer or a port). This solution can be extended to DMRS or CDMed NZP. In certain embodiments, the 4 layers can have different interference to the UE, since each layer can be formed of beams differently from each other. This can be applied
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109/179 for interference from the same cell or a different cell serving multiple UEs in the same time and frequency resources, or in the same frequency resources, but separately in the time domain (for example, MU-MIMO).
[0208] Figure 21 illustrates an example of a UE measuring energy / power in REs ZP CSI-RS, see elements 21A, 21B and 21C, according to certain modalities of this disclosure. In the four REs 2102 (RE 2102a, 2102b, 2102c and 2102d) of the ZP CSI-RS 2100 (see element 21A), the UE can obtain four IM values, IM1-IM4. In some scenarios, it may not be appropriate for the UE to add the energy / power to obtain the real interference (for example, I = IM1 + IM2 + IM3 + IM4), since the energy / power 10 would be counted four times in the obtained I. Without additional information regarding the interference condition, the UE can assume that the interference associated with data transmission corresponds to the average value of the energy / power obtained in the 4 REs 2102 (for example, I = (IM1 + IM2 + IM3 + IM4) / 4).
[0209] However, to potentially improve the significance of the averaging operation, the network can try to ensure that the average corresponds to the data transmission with all four layers in the same RE. Therefore, each layer 2106 of the NZP CSI-RS 2104 can be boosted in power four times or 6 dB (as an example) to match the power level of a PDSCH transmission. In some scenarios, other power boost values may not allow for accurate IM. In certain modalities, the UE may not need to know the power intensification value and may not need to know the presence of NZP / DMRS / PDSCH overlapping REs 2102, but it assumes
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110/179 that the interference conditions in the four REs 2102 may or may not be the same, and the average in the four REs 2102 corresponds to the PDSCH interference condition associated with the IMR REs 2102. There may be multiple sets of four REs 2102 for the ZP CSI-RS and REs 2102 can have the same IM measurement constraint condition. The UE can assume that the interference condition obtained when averaging all REs 2102 is the desired interference condition, and performs averaging operation on all such REs 2102.
[0210] For a DMRS-based PDSCH transmission mode (for example, transmission modes 9 and 10 as specified in LTE 3GPP standards), if EU-specific RSs are present in the PRBs to which the corresponding PDSCH is mapped, UE can assume that the energy ratio per resource element (EPRE) from PDSCH to EU-specific EPRE RS within each OFDM symbol containing EU-specific RS is 0 dB for a number of transmission layers equal to or less than two and - 3 dB otherwise. A similar principle can be adopted here. In certain modalities, the UE assumes that interference is transmitted in the ZP 2102 REs without additional knowledge regarding additional power intensification / covariance matrix / spatial correlation /, etc. for interference. The UE can assume that a weighted sum (or average) of energy / power in the ZP 2102 REs corresponds to the desired interference hypothesis. The UE can perform weighted sum (or average) of energy / power in the REs ZP 2102 to obtain the desired interference hypothesis. This UE operation may be a consequence of the UE assumption that interference is transmitted in the ZP 2102 REs without additional knowledge of the interference. In certain
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111/179 modalities, without additional knowledge regarding additional power intensification, the UE can assume that the interference has 0 dB of power intensification for each RE 2102.
[0211] IM modalities based on multiple ZP CSI-RSs are provided. In some embodiments, the UE behavior and the corresponding configuration are similar to those with a ZP CSI-RS (for example, the UE can assume that the interference condition obtained by averaging all REs is the desired interference condition) and performs an averaging operation on all such REs. Some of the ZP CSI-RSs can overlap PDSCH regions of neighboring cells, which really corresponds to the interference conditions that can be averaged. If some of the ZP CSI-RSs can overlap RS regions of neighboring cells, different ZP CSI-RSs are actually associated with different interference conditions.
[0212] In some modalities, however, the UE may not need to know the difference, and simple averaging can still be significant (for example, when RSs are intensified in power in an appropriate way to consider the reuse factor in all cases). such ZP CSIRSs). For example, if an RS layer is only in n REs among the M REs for ZP CSI-RSs, then it may be appropriate to intensify the layer M / n times, which may be the assumption of UE to perform the averaging through of all ZP CSI-RSs, but it may not be desirable to consider other ZP CSI-RS standards for UEs. In this case, certain operations can be indicated by the network. For example, the UE can first perform averaging within each ZP
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CSI-RS, and then perform addition and / or subtraction to obtain a real interference value, such as ZP1 + ZP2-ZP3, where the addition to add the interference / energy power in two ZP CSI-RSs and the subtraction can solve the double noise and interference count common for all ZP1 ~ ZP3. For ZP1 and ZP2, there may be overlap with interfering RS1 and interfering RS2 in orthogonal time / frequency resources, and each RS can be intensified in power according to its own reuse factor, and ZP3 may not contain RS1 or RS2. The network can indicate the operations, averaging, addition and / or subtraction for each ZP CSI-RS, such as (+, +, -) in the previous example. If there is an additional ZP4 with the same hypothesis as ZP3, ZP3 / ZP4 can be indicated to have the average calculated first before having the subtraction (for example, (ZP1 + ZP2- (ZP3 + ZP4) / 2) or (+1 , +1, -1/2, -1/2)). If ZP1 ~ ZP3 are for RS1 ~ RS3 orthogonalized in the time / frequency domain, ZP4 is for another interference, then (ZP1 + ZP2 + ZP3-2ZP4), or (+1, +1, +1, -2), can be indicated. In a generalized way, when a ZP is added M times, then the ZP CSI-RS is to be subtracted M-1 times, so that redundant addition is not performed for the interference measurement. In this case, M is 3 for the addition part in the example ZP1 + ZP2 + ZP3-2ZP4, while M-l is 2 for the subtraction part of ZP1 + ZP2 + ZP3-2ZP4.
[0213] If ZP1-ZP3 are for RS1-RS3 orthogonalized in the time / frequency domain, ZP4 / ZP5 are for another interference, then (ZP1 + ZP2 + ZP3-ZP4-ZP5), or (+ 1, +1, + 1, -1, -1), can be indicated. Note that more overhead can be used to signal -2 or -1/2 or other fractions, which may be more suitable for configuration signaling
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RRC / MAC than for DCI PHY signaling. Additionally or alternatively, the network can signal the types of ZP CSI-RSs: type one for orthogonalized RS in the time / frequency domain, type two for suppression of resources for type one RS, and the UE can add all ZP Type one CSI-RSs, subtract one less than the average of all type two ZP CSIRSs. In certain modalities, with the defined UE behavior, the network needs to signal + or - (1 or -1, or equivalent).
[0214] The UE assumes that interference is transmitted in the REs of multiple ZP CSI-RSs for IM without additional knowledge regarding additional power intensification / covariance matrix / spatial correlation, etc. for interference. The UE can assume that the weighted sum (or average) of energy / power in the REs for all ZP CSIRSs corresponds to the desired interference hypothesis. The UE can perform weighted sum (or simple average) of energy / power in the ZP CSI-RS REs to obtain the desired interference hypothesis. This UE operation may be a consequence of the UE assumption that interference is transmitted in the ZP CSI-RS REs without additional knowledge of the interference. Note that, without additional knowledge regarding additional power intensification, the UE can assume that the interference has 0 dB power intensification for each RE of each ZP CSI-RS for IM. Additionally or alternatively, if the network provides the UE with information such as ZP1 is for a first interference part and ZP2 is for a second interference part, then the UE can add the average energy in the ZP CSI-RSs to obtain the interference associated with hypothesis of
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114/179 desired interference. If the network provides the UE with information such as ZP1 is for a first interference part, ZP2 is for a second interference part and ZP3 is for common interference for ZP1 and ZP2, then the UE can add the average energy in ZP1 / ZP2 and then subtract the average energy in ZP3 to obtain the interference associated with the desired interference hypothesis.
[0215] IM modalities based on NZP CSI-RS and where NZP CSI-RS is not overlapped with NZP CSI-RS for CM are provided. To signal an NZP CSI-RS to IM for a UE, in addition to NZP CSI-RS resource settings (ports, time / frequency resources, etc.), the scrambling ID can be signaled so that the UE can extract the RS signal (for example, this RS signal should not be confused with the intended signal for CM; here the RS signal serves as an interference signal). With the extracted interference signal, the UE can estimate the interference channel matrix (for example, this interference channel matrix should not be confused with the intended channel for CM; here the interference channel matrix serves as a measurement of interference channel).
[0216] Based on this estimated interference channel matrix, the UE can perform interference rejection. For example, a potentially more accurate interference covariance matrix can be obtained for interference cancellation. The NZP power intensification in relation to the PDSCH power level can be signaled. For example, in a 4-port NZP CSI-RS, layers 1/2 are CDMed in two REs, and layers 3/4 are CDMed in the other two REs. Each layer can be intensified by
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115/179 dB, and the resulting RE power is equal to the PDSCH associated with all four layers in each RE. The power boost may not be signaled if the EU assumption set by default is to assume a power boost for the PDSCH level. So with a total of N layers in N REs, with each RE carrying only n (<= N) layers, a power boost of N / n times can be assumed. This is related to the CDM project (for example, in this case the CDM is through all n layers). In LTE NZP CSI-RS, n = 2, and for DMRS it is 1/2/4. NR, CDM 1, 2, 4, 8 are supported for NZP CSIRS ports 1, 2, 4, 8, 12, 16, 24 and 32. CDM only in the frequency domain, CDM only in the time domain and CDM in the F / T domain are supported. In general, the CDM value and its type can be signaled to the UE for an NZP CSI-RS. The CDM information and NZP CSI-RS port information can then be used by the UE to imagine the implicit power intensification. For example, for NZP CSI-RS with 32 ports and 8 CDM, each layer is enhanced by 4. However, if the network needs more flexibility in power intensification, then the power intensification value needs to be explicitly flagged for the UE . In addition, even if an NZP CSI-RS for IM is signaled to an UE, the UE may not be able to extract the NZP CSI-RS interference signal safely enough since the interference may not be strong enough (but still not negligible). Some UEs without advanced receiver capability or having NZP CSI-RS measurement capability limitations may not be able to extract the NZP CSI-RS. Therefore, an NZP CSI-RS for IM may or may not be extractable by a UE, and for an e
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116/179 other case modalities are provided.
[0217] First, cases in which IM is based on an NZP CSI-RS and NZP CSI-RS is not overlapped with NZP CSI-RS for CM are provided. If the UE cannot extract the NZP CSIRS for IM, then the UE behavior and assumption for the NZP CSI-RS may be the same as for a ZP CSI-RS. The UE can assume that interference signal (s) is (are) transmitted in NZP CSI-RS to IM, and each NZP CSI-RS port is for an interference layer. The UE can assume that each interference layer is intensified in power according to the factor of # ports / CDM. In another mode, the UE can assume that each interference layer is intensified in power by 0 dB and each RE contains all interference layers. In any case, the UE can assume that the interference condition obtained by averaging all REs is a preferred result.
[0218] The UE can perform an averaging operation on all such REs. Correspondingly, the network can ensure the correct power boost (for example, step up to PDSCH level and according to # ports / CDM). This value may or may not be flagged for the UE, since the UE can be derived from the configuration / indication of NZP CSI-RS. The UE can overwrite / ignore if a different value is received. Additionally or alternatively, the UE can perform averaging if the power boost value is equal to # ports / CDM. If other values are used by the network, even if the values are signaled to the UE, the UE may still not obtain a balanced interference estimate, since in NZP CSI-RS REs intensified interference not at the PDSCH level (the signal
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NZP CSI-RS) and another intensified interference to level
PDSCH and noise are overlapping and not separable. On the other hand, if the UE can extract the NZP CSI-RS for IM, then the UE can separate the NZP CSI-RS and the remaining noise and interference 10. For example, the UE can estimate the Hi interference channel, and formulate
Y = H _s S + Hi Si + 10, where Y is the received signal, HsS is the desired channel matrix (obtained from CM resources) times the desired signal, Hi Si is the interference channel matrix (obtained from NZP IMR CSI-RS) times interference signal, and 10 is noise plus another interference (for example, all interference plus noise except interference associated with NZP signal Hi Si). Hi can be obtained by averaging multiple NZP CSI-RS REs satisfying the signaling measurement constraint, layer by layer (for example, the UE assumes that each NZP CSI-RS port is associated with an interference condition), but not through layers. For 10 it can be the average calculated in all IMR REs assuming the same interference condition as in ZP CSI-RS. Based on the equation shown above, the UE can perform interference rejection in the CSI measurement and CQI / RI / PMI computations. The performance is supposed to be better than that of ZP-based IM and NZP-based IM where the signal is not extractable. Since the UE can extract the NZP CSI-RS, any power boost value can be used and signaled to the UE. With possibly greater power intensification, the estimate of Hi may be more accurate, but the extra intensification can be discounted in Hi in such a way that the UE would not assume greater interference. In some scenarios,
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118/179 however, this method is not robust enough to cover certain other cases, and so in certain modalities it may be desirable to increase NZP CSI-RS to the PDSCH level.
[0219] Figure 22 illustrates an example 2200 of IM based on multiple NZP CSI-RSs and not overlaid with CMR, according to certain modalities of this disclosure. Two NZP CSI-RSs for IM are illustrated in this example (one first corresponds to line 2202a and a second corresponds to line 2202b). Figure 22 shows four columns 2204 (column 2204a, column 2204b, column 2204c and column 2204d) from the perspective of a server cell 2206, interferer 1 2208, interferer 2 2210 and a plurality of remote interferors 2212, respectively.
[0220] In NZP CSI-RSs, the serving cell silences, while interfering (which may be in the same cell as the serving cell or in a different cell than that of the serving cell) transmit in one of the NZP CSI-RSs and silences in the other . In this case, the UE assumes that the server signal is not transmitted on the NZP CSI-RS for IM, and an interference signal is transmitted on the NZP CSI-RS for IM. If NZP CSI-RS interfering signal information is signaled to the UE, such as scramble ID, layers / ports, CDM, P _c , such information can also be assumed by the UE (for example, similar assumptions such as NZP CSI CM signal -RS, but the assumptions are for IM instead). In certain embodiments, no other assumptions are made by the UE regarding the interference signal. In certain modalities, if any of the information indicated above is not flagged for the UE, the UE does not make the associated assumption for IM.
[0221] Certain modalities depend on whether the UE can
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119/179 be able to extract both NZP CSI-RSs, neither NZP CSIRS or one of NZP CSI-RSs. If both can be extracted, a UE can estimate both arrays of interfering channels H1 and H2, and obtain the remaining interference and noise 10 when averaging the energy / power in NZP CSI-RSs by discounting NZP CSI-RS signals. 10 is noise plus other interference (for example, all interference plus noise except interference associated with none of the NZP CSI-RS signals). A UE can formulate the following:
Y = H _s S + Hi Si + H ₂ S ₂ + 10.
[0222] In this example, interference rejection / cancellation can be performed for measurement and CSI computation. If no NZP CSI-RS is not extracted, then in some scenarios the UE can obtain (11 + 10) in NZP1, where II and 10 are not separable, and the UE can obtain (12 + 10) in NZP2, where 12 and 10 are not separable. Adding (11 + 10) and (12 + 10) can result in a double count of 10, potentially making averaging an appropriate technique. This implies that (11 + 12) / 2 + 10 can correspond to the actual PDSCH interference condition. An argument based on matrix classification can illustrate that this is not possible with four times of power intensification (corresponding to intensifying to the PDSCH level of that interferer), and instead uses eight times of power intensification for NZP CSIRSs, where the eight comes from the reuse factor for NZP CSI-RS interference signals considering both NZP CSI-RSs, and not an NZP CSI-RS from an interferer. In some scenarios, however, this intensification may cause predisposition to another UE that is configured with one of the NZP CSI-RSs for IM, and consequently may not be desirable in some
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120/179 scenarios. If one of the NZP CSI-RSs is extracted (for example, NZP1 is extracted, but NZP2 is not extracted), then the UE can separate II and 10 NZP1, but (12 + 10) in NZP2. The UE can formulate the following:
Y = H _s S + Hi Si + (12 + 10).
[0223] In this example, interference rejection / cancellation can be performed. Therefore, it may be desirable to adopt different UE behaviors based on the extraction capacity of NZP CSI-RSs as described above, and there may be cases in which estimation of non-predisposed interference is difficult or impossible to obtain. Therefore, such IM configurations can have limited benefits in practical situations.
[0224] Modalities for IM based on one or more NZP CSI-RSs and on one or more ZP CSI-RSs, and in which none is superimposed with NZP CSI-RS for CM, are provided. In certain modalities, this approach can overcome some of the challenges described above, and can improve the accuracy of IM, with the possible price of greater measurement overhead. In some embodiments, the ZP CSI-RS (s) is (are) specified to have the interference condition including all interference in the NZP CSI-RS IMRs. If any of the NZP CSI-RSs is not extractable, the ZP CSI-RS (s) can be used to measure and average the interference. If all NZP CSI-RSs are extracted, then the NZP CSI-RS interfering signals can be averaged individually and then summed across all NZP CSIRSs, and the interference plus noise remaining in some or all NZP CSI-RSs can be averaged to get 10. The ZP CSI-RS (s) can also be used to get
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121/179 interference plus average remaining noise, by subtracting energy / power from signals associated with NZP CSI-RSs (after removing power intensification). In some other modalities, the ZP CSI-RS (s) is (are) specified (s) to have the interference condition excluding all interference in the NZP CSI-RS IMRs.
[0225] If any of the NZP CSI-RSs is not extractable, the UE can assume that all NZP CSI-RSs are ZP CSI-RSs overlapping with RS and, similar to the multiple ZP CSI-RSs for IM, all NZP (s) CSI-RS (s) and the ZP CSI-RS (s) can be used to perform the specified operations (averaging, addition, subtraction) to obtain interference in a non-predisposed mode. That is, all NZP CSI-RSs are considered to be +, and all ZP CSI-RSs are considered to be On the other hand, if all NZP CSI-RSs are extracted, then the NZP CSI-RS interfering signals will be averaged individually and then added together across all NZP CSI-RSs, and the interference plus noise remaining in some or all NZP CSI-RSs and ZP CSIRSs can be averaged to get 10. On the network side, the network can coordinate NZP CSI-RSs / ZP CSIRSs / IMRs / CMRs to try to ensure that the signaling (configuration / indication) matches the desired IM / CM / CSI hypotheses / conditions. To properly orthogonalize, NZP CSI-RSs and sometimes ZP CSI-RSs can use network coordination and relatively high metering overhead.
[0226] The modalities previously exposed are for non-overlapping CMRs and IMRs. If CMRs and IMRs can overlap, however, different modalities, such as those described below, may be appropriate.
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[0227] Some modalities are applied for scenarios in which NZP CSI-RS CMR and IMR overlap completely and an NZP CSI-RS feature is configured. A UE can assume that a server signal (s) to the UE is (are) transmitted on the resource according to the configuration / indication, and an interference signal (s) is also ( are transmitted in the resource according to the configuration / indication. That is, the UE runs CM and IM on the same set of REs as an NZP CSI-RS resource. Throughout this description, the term NZP or NZP CSI-RS can refer to the NZP CSI-RS signal, NZP CSI-RS resource or both NZP CSIRS signal and NZP CSI-RS resource. In general, the particular meaning will be evident to a person of ordinary skill in the art from the context in which the term is used. In some cases, this disclosure specifies a distinction. For example, in overlapping cases, the NZP signal for CM and the NZP signal for IM are in the same NZP resource.
[0228] Figure 23 illustrates an example 2300 use case of superimposed CSI-RS resource for channel and interference, according to certain modalities of this disclosure. An NZP CSI-RS feature, as an example, can be configured for channel measurement as well as for interference measurement.
[0229] Based on previous CSI information, a gNB determines MU transmission in the time interval n + 1 for a set of UEs. In the CSI-RS resource of time slot n, the gNB transmits CSI-RS formed of beams to each UE in the MU group. Each UE in the MU group can estimate a channel to obtain the desired signal, as well as interference by discounting (for example, subtracting) the desired UE's own signal from the received signal. For example, from the
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123/179 perspective of UE k, the signal received at NZP expressed as:
where Σί * / <H _k WiSi is MU interference
CSI-RS can be
Ik represents interference between cells and m represents thermal noise.
In some scenarios, when the NZP CSI-RS feature is aligned between surrounding cells and each cell follows the same mechanism for transmitting
NZP CSI-RS, the term
Ik can between cells that experienced in the future time interval
Consequently, with this configuration, a gNB
PDSCH is able to predict interference in the future PDSCH, including both MU interference and interference between cells. Another example of this predicative capacity is described below with reference to figure 30.
[0230] It can be noted that different CSI-RS ports (orthogonalized via, for example, FDM, CDM) in a CSI-RS resource can be assigned to different users. For example, this mechanism can be used for a non-PMI feedback case (for example, port index indication by CSI-RS feature can be configured via
RRC to select the CSI-RS port (s) used for calculating RI / CQI by classification), however this disclosure considers use of this mechanism in other scenarios. With a configuration like this, channel measurement on designated CSI-RS ports may not be impacted by other interfering ports.
[0231] Figure 24 illustrates an example use case 2400 for non-overlapping CSI-RS resource for channel and interference measurement, according to certain modalities of this
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124/179 revelation. From the WEU perspective, NZP CSI-RS # 0 is for channel measurement while NZP CSI-RS # 1 and # 2 is for interference measurement. When a gNB emulates potential MU signals in NZP CSI-RS # 1 and # 2 resources, the WEU can probe MU interference by measuring interference in these two IM resources.
[0232] In some situations, however, interference between cells may not be fully captured in this way, even if the NZP CSI-RS feature set is aligned with the NZP CSI-RS features of neighboring cells.
[0233] Figure 25 illustrates an example use case 2500 showing interference between cells in a configuration with non-overlapping CMR and IMR, according to certain modalities of this disclosure. In this scenario, the configuration of CSI-RS resources in cell M 2502 is the same as in cell O 2504, where resources # 0, # 1 and # 2 are assigned to UEx, UEy and UEz for channel measurement. Users in cellO also use these features to probe for cellM interference. However, from the perspective of the UEO, the interference between M cell cells that are actually serving the UEy and the UEz is captured. Missing UEx interference can result in inaccurate polling of interference between cells. If, on the other hand, the NZP CSI-RS feature set in cell O is orthogonal to the NZP CSI-RS features of neighboring cells, the UEO can then be configured with five NZP CSI-RS features for IM to measure MU interference within the cell and interference between M cell cells. In general, if M interfering cells are in the vicinity of the WEU, and each cell
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125/179 support N UEs, (M + 1) N NZP CSI-RS resources for IM are configured for the UEO, resulting in potentially undesirable overhead and complexity.
[0234] Probe for interference between cells (especially interference between rapidly changing cells) can be an important feature of interference measurement based on NZP CSI-RS. Probing for interference between cells and / or MU interference can improve link adaptation. Thus, to achieve the gain of better link adaptation, particularly for those cells that are capable of aligning with NZP CSIRS configuration, modalities of this disclosure support overlapping CSI-RS resource (s) for channel and interference measurement.
[0235] Assumptions and behavior of a UE for NZP-based IM can be defined in a standard specification. As previously described, an IM-based NZP CSIRS signal (in speed reduction mode and non-speed reduction mode) can be considered separately. For an IM based NZP CSI-RS resource, both overlapping and non-overlapping can be considered.
Case 1: IM is obtained after extracting a signal from the server.
[0236] In this case, the UE extracts the server signal in the NZP CSI-RS, and the remaining energy / power in the REs is to be used to obtain IM. Case 1 includes the following two scenarios:
Case 1-1: IMR and CMR overlap completely. In this scenario, the UE can assume that the interference condition after discounting the server signal corresponds to the actual interference condition, and additional operations (except for
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126/179 averaging all IM-related RMs) can be avoided, if appropriate.
Case 1-2: IMR and CMR partially overlap. In this scenario, after discounting the server signal in some IMR
REs, the UE gets IMR interference REs additional, and potentially in all the IMR REs. [0237] 0 HUH can adopt The approach in addition / subtraction described above for the Case 2 (described The below), which use signaling network > additional and
associated UE behavior. This addition / subtraction approach can be complicated if multiple NZPs and ZP (s) are used. For example, for three NZPs and one ZP, the UE can execute | íj | + | Κ ₂ | + | Κ ₃ | ^{- 2/2} . This scenario is similar to that of multiple ZPs described earlier, and projects can be reused for the addition / subtraction approach.
[0238] Additionally or alternatively, the UE can assume that it is permissible to average all IMR REs to obtain the desired interference condition for
IM, and the network you can try ensure consistency. It is approach can simplify the assumption and behavior in HUH. Case 2: IM is obtained in IMR without extracting a signal in server. In this case, the NZP IMR REs contains interference, and the HUH
can estimate energy / power in NZP REs to obtain IM. Similar to Case 1-2, the addition / subtraction approach can be considered, but it may be desirable to use the simpler averaging approach.
[0239] Therefore, in all cases the behavior of UE can be unified to be averaged in some,
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127/179 and potentially all, IMR REs. This averaging approach can also unify the behavior of UE in NZP CSI-RS and / or in ZP CSI-RS for IM. The base station implementation can attempt to ensure that the IM obtained in this way matches the desired interference condition. One way is to standardize the UE behavior of averaging power / energy across all NZP CSIRS / ZP CSI-RS IMR REs, after discounting server signal, if any.
[0240] For CSI-RS resource (s) configured for both channel and interference, the subtraction operation can be defined. Then the remaining signals / power after subtracting the desired signal are partial or total interference.
[0241] For an NZP CSI-RS configured for IM, but not for CM (for example, for cases with IMR and CMR not overlapping), or configured for IM and CM, but with a subtracted server signal, the sum or weighted sum of extracted interference ports can be performed by the UE. This approach may be because of a CSI-RS port corresponding to an interfering layer (for example, interference transmission layer), such that the sum or weighted sum operation potentially reflects total interference. An appropriate network implementation can be used to provide this approach. An example of the weighted sum is to average the interference power across all ports, which potentially does not use additional signaling support.
[0242] For CSI-RS resource (s) configured for both channel and interference, the UE assumes that its (s)
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128/179 desired signal (s) is (are) transmitted in the resource and according to network configuration / indication, and interference signal (s) is also (are) transmitted (s) resource and according to network configuration / indication. The UE can execute CM on the resource by extracting the desired NZP CSI-RS signal. Then the remaining signals / power after discounting the desired signal are interference to be measured by the UE.
[0243] When more than one NZP CSI-RS resource has to be configured for interference measurement, the UE assumptions to allow the UE to properly combine interference in NZP CSI-RS resources can be defined.
[0244] Figure 26 illustrates another example 2600 configuration of a NZP CSI-RS resource set, according to certain modalities of this disclosure. Using non-overlapping CSIRS resources as an example, in cell O, NZP CSI-RS # 0, # 1 and # 2 resources are assigned to UE0 (shown in 2602), UE1 (shown in 2604) and UE2 ( shown in 2606), respectively, for channel measurement. For each UE, the other two CSI-RS resources, except for the CSI-RS resource for CM, are IMRs.
[0245] For UE0, the interference in resources # 1 and # 2 can be expressed as Y _x -I _x + I _inter and ^ 2 = / 2 + / ^, respectively. Ι _γ and 7 ₂ are the interference for the UE1 and the UE2, and I _inter is the interference of a neighboring cell, which can reflect the interference on the downlink in a measurement time interval. There is a higher layer parameter p _c ('powerControlOffset') associated with each NZP CSI-RS resource, which is interpreted as offset
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129/179 power from NZP CSI-RS RE to PDSCH RE. Consequently, assuming p _{cl and} p _c2 as the power shifts associated with resources # 1 and # 2, Yi and Y2 can be represented as follows:
T ~ ^ Pc, l PDSCH, i ⁺ inter
L = ^ Pc, 2 PDSCH, 2 ⁺ inter
[0246] Since an objective is to measure interference from MU PDSCH, the weighted sum operation can be defined as
PDSCH, 1
PDSCH, 2.1. I ²
I mterj ·
When
--1 - = 1, the result would be MU interference and between
Pc.l Pc, 2 cells. If the P _c s are equal, then each is 2 (for example, a UE can average the interference energy in NZP CSI-RSs for IM). Alternatively, if IMR also covers resource # 0 and the UE can get I _inter on the resource, then the UE can perform a weighted sum on all ^{1 1} .
three NZP CSI-RSs for IM, and if - 1 --- 1— = 1, then IM does not
Pc, Pc l, ³ predisposed 2 can be obtained. If the P _c s are equal, then each is 3 (for example, the UE can average the interference energy in NZPs for IM). In certain embodiments, P _c is the reuse factor previously described for power intensification.
[0247] Considering a variety of factors such as the total number of NZP CSI-RSs for IM, NZP CSI-RS ports and CDM factors, each layer can be increased in power to # ports / CDM, where # ports is for all IMs NZP CSIRSs, and CDM is for the layer. For each NZP CSI-RS, the CDM is the same, and therefore the power intensification or P _c is the same for all layers in that NZP CSI-RS. The UE can
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130/179 assume that each interference layer is intensified in power according to the factor of # ports / CDM. The UE can perform averaging operation on all such REs. The UE can overwrite / ignore if a different value is received. Additionally or alternatively, the UE can perform averaging if the power boost value is equal to # ports / CDM. From the description above, when a gNB sets the correct powerControlOffset on each NZP CSI-RS interference feature, the UE can correctly estimate the interference power. Some restrictions on the 'powerControlOffset' configured for each NZP CSI-RS resource may be appropriate.
[0248] Another alternative is to introduce an additional ZP CSI-RS feature to solve the double counted interference problem between cells. For example, the interference power between cells can be estimated in ZP CSI-RS and denoted by | / _Iíter | ² , and the MU interference between total cells can be obtained as - (^ - ^, 1 ^ + - (^ Pc, l Pc, 2
In this example, there is no restriction on 'powerControlOffset'; however, this example uses an additional ZP CSIRS feature, and the ZP CSI-RS feature can be carefully coordinated among gNBs so that the approach can accurately capture the intended interference condition for the UE. In certain embodiments, an additional ZP CSI-RS resource is not used, but the CMR is also specified as an IMR, and the UE can obtain I _inter on the resource.
[0249] When a NZP CSI-RS feature set is aligned between cells, obtaining measurement of interference between cells not predisposed, powerControlOffset may not necessarily be configured or used in features with
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131/179 MU interference, or left for gNB implementation. The weighted sum for interference across NZP CSI-RS resources can accurately reflect MU and cell interference.
[0250] When a NZP CSI-RS resource set in a server cell is assumed to collide with a neighboring cell PDSCH, the appropriate 'powerControlOffset' can be configured for each NZP CSI-RS resource with MU interference. So the weighted sum for interference across all interference features can reflect the MU and a part of interference between cells that varies slowly. In certain embodiments, when configuring an NZP CSI-RS resource for IM, scramble ID, layer / port or CDM information may not need to be specified if P _c powerControlOffset is specified and P _c is selected to enhance NZP CSI power -RS for PDSCH level. In other words, P _c summarizes information about CDM and layers / ports. OP _c can be configured for each NZP CSI-RS resource within a set of NZP CSI-RS resources. For the same NZP CSI-RS resource within different NZP CSI-RS resource sets, P _c may be different, since the reuse factor may be different for different resource sets. That is, P _c may be specific to a NZP CSI-RS resource set, but it may not be specific to an NZP CSI-RS resource. If additional NZP CSI-RS signal information is configured / displayed (for example, scramble ID, layer / port or CDM information), additional NZP CSI-RS signal information can be specified for each NZP CSI-RS resource ; that is, additional NZP CSI-RS signal information can be a resource
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NZP CSI-RS specific.
[0251] When NZP CSI-RS resource (s) is (are) configured (s) for both channel and interference measurements, a UE assumes that remaining signals, after discounting server signal, would be partially or totally interference.
[0252] For each NZP CSI-RS resource configured for IM, the UE assumes that the sum or weighted sum of interference ports extracted would reflect the interference in this resource.
[0253] The UE assumes a weighted sum of the estimated interference in all resources for measuring interference. A scaling factor associated with NZP CSI-RS P _c can be assumed.
[0254] A CSI request field can activate set (s) of aperiodic CSI-RS resources for channel and / or interference measurement. It may be desirable to indicate which feature set among these CSIRS feature sets is for channel measurement and which is for interference measurement. The following are two example options to address this:
Option-1: Each activation state of a CSI request field would reflect the combination of {CSI reporting configuration, CSI-RS feature set for channel, CSI-RS feature set for interference};
Option-2: Each CSI request field activation state would indicate CSI reporting configuration and this CSI reporting configuration associated with CSI-RS resource sets. An additional bit field in the DCI can also select the channel and set feature set
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133/179 of resources for interference.
[0255] Both options can support interference measurement based on NZP CSI-RS. Option 2 can provide more flexibility in selecting CSI-RS features for channel or interference measurement. Option 1 can achieve the same flexibility when sufficient activation states are supported in the CSI request field. RRC signaling, however, can configure each state corresponding to each measurement hypothesis and reporting configuration. Using component carriers in the activation states, RRC signaling overhead and configuration complexity can be a consideration. Therefore, adjacent to the CSI request field (or in another suitable location in relation to it), an additional bit field in the DCI to further select the feature set for channel measurement and feature set for interference measurement can be introduced .
[0256] In some modalities, all NZP resources for CM / IM are assigned the same scrambling ID, which can simplify the receiving operation by the UE. A set of NZP CSI-RS resources can be assigned the same scrambling ID. In certain modalities, all resources are used for IM, and some layers and / or some resources are used for CM. Different UEs share the same scramble ID if they are married in MU mode. Multiple TRPs within a nearby neighborhood can share the same scramble ID in polling resources.
[0257] CSI reporting configuration (s) can be enabled via DCI. If enabling CSI reporting is
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134/179 indicated in conjunction with CSI-RS resource activation, an IE in DCI can indicate configuration (s) of both CSI-RS resource and CSI reporting. Otherwise, two separate LEs can be used. The number of CSI reporting configurations can be greater than one in order to report multiple CSIs to decrease CSI reception delay on the gNB side. In one embodiment, a DCI can activate a set of CSIRS resources. This set can be used for IM, and additional DCI bits indicate a subset of the set for CM. Therefore, in certain embodiments, CMR can be a subset of IMR. In another modality, a DCI can activate a set of CSI-RS resources. This set can be used for CM and / or IM, and additional DCI bits indicate a subset of the CM set and additional DCI bits indicate a subset of the set for IM. In another modality, a DCI can activate a set of CSIRS resources. This set can be used for CM, and additional DCI bits indicate ZP / NZP CSI-RS resources such as IMR. This disclosure considers the configuration and indication for CMR / IMR / CQI rate measurement / reporting / matching being performed in any appropriate mode, according to particular implementations.
[0258] Certain modalities described above refer to the energy / power of an ER or associated with an NZP CSI-RS signal in an ER for CM and / or IM. This energy / power can be referred to as energy per resource element (EPRE). Downlink power control can determine EPRE. The term RE energy denotes energy before the insertion of a cyclic prefix. The term RE energy also denotes the average energy assumed at all points of
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135/179 constellation for the applied modulation scheme. Uplink power control determines the average power in an SC-FDMA symbol on which the physical channel is transmitted.
[0259] For the purpose of RSRP and RSRQ measurements, the UE can assume that downlink cell specific RS EPRE is constant across the downlink system bandwidth and constant across all subframes with signal transmissions uncovered up to that different cell-specific RS power information is received.
[0260] For a cell that is not a Licensed Assisted Access (LAA) small cell (Scell), the UE can assume that downlink cell-specific RS EPRE is constant across the downlink and constant system bandwidth through all subframes until different cell-specific RS power information is received.
[0261] The downlink cell-specific reference signal EPRE can be derived from the downlink reference signal transmission power given by the referenceSignalPower parameter provided by higher layers. The downlink reference signal transmission power is defined as the linear average in the power contributions (in [W]) of all REs that carry cell-specific reference signals within the operating system bandwidth.
[02 62] For a LAA SCell, the UE can assume that the downlink cell specific RS EPRE in subframe n is the same downlink cell specific RS EPRE in subframe n-1, if all symbols
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OFDM of at least the second time slot of the n-1 subframe are busy.
[0263] The ratio of PDSCH EPRE to cell-specific RS EPRE among PDSCH REs (not applicable for PDSCH REs with EPRE zero) for each OFDM symbol is denoted by qa or Qb according to the OFDM symbol index as given in the Table
2 and by Table 3 a follow. Number indices of OFDM symbols indices of OFDM symbols in inside of a break inside of a break doors of time where the reason for of time where the reason for in PDSCH IT'S PRE PDSCH IT'S PRE antenna corresponding to RS corresponding to RSCell specific EPRE is Cell specific EPRE isdenoted by qa denoted by qbPrefix Prefix Prefix Prefixcyclic cyclic cyclic cyclicnormal extended normal extended One or 1, 2, 3, 1, 2, 4, 5 0, 4 0, 3 two 5, 6 Four 2, 3, 5, 6 2, 4, 5 0, 1, 4 0, 1, 3
Table 2: OFDM symbol indexes within a non-MBSFN subframe where the ratio of the corresponding PDSCH EPRE to the cell-specific RS EPRE is denoted by qa or Pb
Number of antenna ports OFDM symbol indexes within a time interval where the corresponding PDSCH EPRE ratio to RS OFDM symbol indices within a time interval where the ratio of the corresponding PDSCH EPRE to the RS
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EPRE specific cé squid is Cell specific EPRE isdenoted by Padenoted by p _BPrefix Prefix Prefix Prefixcyclic cyclic cyclic cyclicnormal extended normal extendedn _s n _s n _s n _s n _s n _s n _s n _s mod mod 2 mod 2 mod 2 mod mod mod 2 mod 22 = 1 = 0 = 1 2 2 = 0 = 10 0 1 One or 1, 0, 1, 1, 2, 0, 1, 0 - 0 - two 2, 2, 3, 3, 4, 2, 3,3, 4, 5, 5 4, 54, 6 5, 6 Four 2, 0, 1, 2, 4, 0, 1, 0, 1 - 0, 1 -3, 2, 3, 3, 5 2, 3,4, 4, 5,4, 55, 6 6
Table 3: OFDM symbol indexes within a time frame of an MBSFN subframe where the ratio of the corresponding PDSCH EPRE to the cell-specific RS EPRE is denoted by p _A or p _B.
[0264] Furthermore, Pa and _B are specific to the UE.
[0265] Modalities for measuring time domain restriction for channel and interference measurement are provided. Taking into account the flexibilities to fit the rich channel conditions in various NR scenarios, measurement restriction through a configurable number of time intervals can be considered in NR. In addition, the change of beam former can be associated with
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138/179 certain events such as, for example, TRP applying a new beam according to the beam indicator (for example, CRI) or the like reported by the UE. Other events include RRC measurement and / or resource reconfiguration. When an event like this occurs, it may be appropriate for the UE to re-establish its channel measurement and not average the measurements before and after the event. Therefore, restoration of channel measurement in the time domain because of relevant events can be supported.
[0266] For reasons similar to those described above for time measurement channel restriction, interference measurement restriction through a configurable number of time intervals can be considered in NR, in order to align with the possible configuration of time measurement channel restriction.
[0267] Therefore, in certain modalities, a configurable number of time intervals is supported for restricting channel measurement / interference in the time domain and restoring measurement in the time domain because of a change in CRI and / or settings measurements / resources. In some scenarios, a range of time slot values can include at least {1 time slot, # unrestricted time slot}. Linearly increasing numbers of time slots can be supported, such as {1, n, 2n, 3n, ..., # unrestricted time slots}, where n = 5 or 10. Non-linearly increasing time slot numbers can be supported, such as {1, 2, 4, # unrestricted time slots} for 2 bits or {1, 2, 4, 8, 16, 32, 64, # unrestricted from
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139/179 time intervals} for 3 bits. Note that the number of time intervals here is the number of time intervals with measurement capabilities, and excludes time intervals without measurement capabilities.
[0268] The restriction of channel measurement in the frequency domain, on the other hand, can be considered in situations where multiple services exist in different parts of the entire frequency band. Although channel measurement at full bandwidth is possible, it may be appropriate for certain services to measure one or a few parts of bandwidth for the UE. In this respect, restricting channel measurement in the frequency domain can be beneficial.
[0269] Multiple parts of bandwidth can be configured for a UE, each part of bandwidth corresponding to a specific numerology to support the relevant service. At least one of multiple parts of bandwidth can be activated, however multiple parts of bandwidth with different numerologies activated simultaneously can also be considered. With this flexibility of part bandwidth configuration, the channel measurement constraint in the frequency domain can be applicable in measurements of partial bandwidths (for example, measurement restricted to one or more parts of bandwidth within the width total bandwidth).
[0270] Certain modalities consider additional measurement restriction within a part of bandwidth. For example, in beam management, a CSI-RS specific to UE groups can cover the entire band of the link or a specific sub-band. An EU-specific CSI-RS can
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140/179 be allocated within frequency resources to a particular UE, in order to provide beam information and / or CSI needs, for example, and also to avoid affecting other FDM-ed transmissions. In this respect, a CSI-RS bandwidth less than the bandwidth portion can be considered, and so the frequency measurement constraint on the frequency domain in the configured CSIRS bandwidth within a bandwidth portion can be considered. appropriate.
[0271] CSI-RS can be configured with a bandwidth less than the bandwidth portion of the UE. In this way, channel measurement features as well as interference measurement features can be configured with their respective bandwidth, which can be equal to or less than the bandwidth part. For a derived CSI, NZP CSI-RS IMR bandwidth can be equal to NZP CSI-RS CMR bandwidth. Otherwise, it may not be reasonable to calculate CQI based on an NZP CSI-RS CMR configured in bandwidth part 1, but an NZP CSIRS IMR in bandwidth part 2, for example. Thus, in certain embodiments, a UE may not expect to receive an NZP CSI-RS resource for measuring interference whose bandwidth does not equal the channel measuring resource bandwidth.
[0272] Regarding the measurement restriction signaling via CSI-RS bandwidth, several techniques can be performed. For example, with an RBG granularity, a bitmap can be used. The length of the bitmap depends on the RBG / CSI-RS bandwidth and the corresponding RBG size. For CSI-RS bandwidth continues, a
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141/179 start position and a bandwidth length can be configured for the UE based on an RB granularity, for example.
[0273] Restriction of channel measurement and interference in CSI-RS resources within a configurable number of sub-bands can be supported, and if the CSI-RS resource has a configured bandwidth less than the bandwidth portion , channel and interference measurements can be restricted to CSI-RS resources within the configured bandwidth.
[0274] In certain embodiments, a UE can be assumed to perform channel / signal / RRM / RLM measurements for a CSI report on the RS resource (s) (including CRS, CSI-RS) indicated by signaling dedicated to the CSI report if flagging is discovered, and otherwise in CRS. In addition, if a resource-restricted measurement subset is flagged to restrict signal / channel measurement resources (note that, however, in 3GPP in general, resource-restricted measurements are to restrict interference measurement resources, not restricting signal / channel measurement capabilities), then the UE is assumed to also restrict its signal / channel measurements within the indicated subset. In one embodiment, an eNB (or other network node) can configure three NZP CSI-RS resources for a UE, and an NZP CSI-RS resource can be assigned without a CQI report for signal measurements (and possibly without interference measurements) . In a case like this, the UE is not assumed to perform channel / signal / RRM / RLM measurements (or interference measurements) on this resource until otherwise signaled by an eNB (or another network node). For example,
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142/179 when the UE receives and demodulates / decodes a PDSCH, the UE is assumed to perform matching and / or rate discarding the REs indicated as NZP CSI-RS resources, but not linked to any CQI. In these REs, the eNB (or other network node) can determine to transmit signals not limited to the signaled CSI-RS contents, but can choose to prevent entry (for example, so that a CSI-RS resource from another point / cell can transmit without interference from this point / cell), or can choose to transmit special signals (for example, so that a CSI-RS resource from another point / cell can perceive the desired interference from this point / cell)
point / cell and an UE can run measurements of interference desired). [0275] For example, in Control Interference
Among HetNet Enhanced Cells (elCIC), a UE UE may seek to report a CQI with a macro silencing and a CQI with a macro interfering, based on measurements on CSI-RS resources. In certain modalities, when the UE measures interference in CSI-RS resources associated with macro silencing, the macro need not be in an almost blank subframe. However, it may be appropriate for the macro to prevent entry into the corresponding REs and choose to mark these REs as an NZP CSI-RS resource that is not linked to any CQI report so that macro UEs can assess marriage with these REs. Similarly, when the UE measures interference in a CSI-RS resource associated with an interfering macro, the macro does not need to be in a not nearly blank subframe. However, the macro can transmit any signals chosen in the corresponding REs and can choose to mark these REs as an NZP CSI-RS resource that does not
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143/179 is linked to any CQI report so that macro UEs can assess marriage with these REs.
[0276] Similarly, in Additional Enhanced Cell Interference Control (FelCIC), when UE peak measures interference in a CSI-RS resource associated with reduced power interfering macro, the macro does not need to be in an almost blank subframe , but can transmit at reduced power in the corresponding REs. The macro may choose to mark these REs as an NZP CSI-RS resource that is not linked to any CQI reports so that macro UEs can evaluate marriage with these REs. Similarly, in Coordinated Beam Suppression (CBB) or in other interstitial interference coordination schemes, when the UE measures interference in a CSI-RS resource associated with a macro interfering with a spatial pattern / beam formation / suppression of beams, the macro does not need to transmit PDSCH according to the standard. However, the macro can transmit according to the standard in the corresponding REs and can choose to mark these REs as an NZP CSI-RS resource that is not linked to any CQI report so that macro UEs can evaluate marriage with these REs. In other words, configuring an NZP CSI-RS resource that is not linked to any CQI report can allow an eNB to emulate or imitate the desired interference in those REs without affecting operations of the eNB UEs. Configuring an NZP CSI-RS resource that is not linked to any CQI reporting can also allow an eNB to perform an operation on those REs that may be backwards incompatible. In other words, signal a non-zero power CSI-RS resource
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144/179 for an UE that is not used for a CQI report is a way for the network to transparently perform ER obscuration or emulation of interference or non-compatible transmissions without affecting the UE behavior. As described below, another way to do this is to signal a ZP CSI-RS resource to a UE that is not used for a CQI report. A possible advantage of using an NZP CSI-RS resource for this purpose is that the NZP CSI-RS resource can be configured more flexibly (for example, in terms of periodicity, subframe offset, number of antenna ports) than the resource ZP CSI-RS, but higher signaling overhead may be involved.
[0277] In certain embodiments, a UE can assume that a signaled CSI-RS resource for channel / signal measurements for a CSI report corresponds to a channel / signal condition (within each resource-restricted measurement subset, if signaled) . A CSI-RS resource signaled to a UE for channel / signal measurements can be associated with a unique CSI-RS index either explicitly or implicitly. For example, a CRS resource can be implicitly indexed as 0. In some embodiments, an eNB (or the network element) allows an NZP CSIRS resource to be configured with zero (none), one or more P _c values. As previously described, P _c can be an assumed ratio of PDSCH EPRE to CSI-RS EPRE when the UE derives CSI feedback. In certain modalities, P _c assumes values in the range of [-8, 15] dB with 1 dB increment size, where the PDSCH EPRE corresponds to the symbols for which the ratio of the PDSCH EPRE to the cell-specific RS EPRE is denoted per qa, as specified in Table 5.2-2 and in
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Table 5.2-3 of TS 36.213. In other words, the P _c value can be used by the UE to compute the associated CQI report, and different P _c values can result in different CQI feedback values even if the CQI feedback values are based on common channel measurement features / signal / interference.
[0278] When there is a possibility of multiple CQI reports, but the same NZP CSI-RS resource is configured for the signal / channel measurements of these CQI reports, allow more than one P _c value to be configured for the same NZP CSI- resource RS may allow the UE to compute each CQI report with the P _C value specified in the CQI report. Another possible advantage of allowing one or more P _c values to be associated with an NZP CSI-RS resource is that this resource can be used to generate two different CQI reports for resource constrained measurements, that is, each CQI report can be associated with a P _c value. If no P _c value is not configured for an NZP CSIRS resource, the UE can be assumed to perform rate matching with CSI-RS REs. Other ways to signal a UE to perform rate matching with CSI-RS REs can be used, such as a bit to indicate so, or by not linking a CQI report to this CSI-RS resource.
[0279] With reference to interference measurements, in 3GPP it was proposed to use NZP CSIRS resources or ZP CSI-RS resources or both for interference measurement resources. If a ZP CSI-RS resource is to be used for interference measurement, it has been generally proposed that each interference measurement resource is a 4-RE resource within a ZP CSI-RS resource and is associated
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146/179 with a 16 bit bit map from the ZP CSI-RS resource. A 4-RE measurement feature unit like this can be referred to as an interference measurement (IMR) feature, or channel state information interference measurement feature (CSI-IM), or a ZP CSI-RS feature for interference measurement. In one embodiment, an eNB (or other network node) can allow zero, one or multiple NZP CSI-RS resources, and / or zero, one or multiple ZP CSI-RS resources, to be configured for a UE for interference measurements for CSI feedback via dedicated signaling. In one embodiment, the total number of NZP CSI-RS resources and / or ZP CSI-RS resources for a UE for interference measurements is configured through dedicated signaling. In one embodiment, the total number of ZP CSI-RS resources for a UE for interference measurements is configured through dedicated signaling. In one embodiment, the total number of ZP CSI-RS resources for a UE (not limited to the purpose of interference measurements) is configured through dedicated signaling. The maximum of any such total number can be predefined in standard specifications or specified as follows.
[0280] In another embodiment, the maximum number of NZP CSI-RS resources and / or ZP CSI-RS resources for a UE for interference measurements is predefined in standard specifications such as, for example, 2, 3, 4 or more. An eNB / MME / CoMP set controller can also limit the actual maximum number via dedicated signaling. For example, standard specifications can default to a maximum of 4, but a CoMP pool controller can signal to eNBs (or other network nodes)
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147/179 controlled by the CoMP pool controller a real maximum to be 2. The eNBs (or other network nodes) inform the UEs via dedicated signaling. In another mode, no limit is specified / signaled for the maximum number of NZP CSI-RS resources and / or ZP CSI-RS resources for an UE. However, the actual maximum number of NZP CSI-RS resources and ZP CSI-RS resources for an UE for interference measurements can be practically limited, for example, by the total number of CSI-RS resources for an UE.
[0281] In one embodiment, the total number of NZP CSI-RS resources and / or ZP CSI-RS resources for a UE is configured through dedicated signaling. In another embodiment, the maximum number of NZP CSI-RS resources and / or ZP CSI-RS resources for a UE is predefined in standard specifications such as, for example, 2, 3, 4 or more. The eNB / MME / CoMP set controller can also limit the actual maximum number via dedicated signaling. For example, standard specifications may default to a maximum of 4, but a CoMP pool controller can signal eNBs (or other network nodes) controlled by the CoMP pool controller to a real maximum of 2. The eNBs (or other network nodes) inform the UEs via dedicated signaling. In another mode, no limit to the maximum number of NZP CSI-RS resources and / or ZP CSI-RS resources for a UE is not specified / flagged.
[0282] As previously described, in some modalities, it may be permissible to configure the number of ZP CSI-RS resources for interference measurements not being related to the configuration of the number of ZP CSI resources
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RS (which can be used for interference measurements and / or obscuring ER and / or other purposes). This can be useful as it can provide more flexibility to configure ZP CSI-RS resources for interference measurements and ZP CSI-RS resources for purposes not limited to interference measurements; however, this may imply separate signaling of ZP CSI-RS resources for interference measurements and ZP CSI-RS resources.
[0283] In some embodiments, an eNB (or other network node) may allow a CSI report for a UE to be configured with zero, one or more NZP CSI-RS resources and / or zero, one or more ZP CSI- resources RS for interference measurements by means of dedicated signaling. If no CSI-RS resources are configured for interference measurements for a CSI report by means of dedicated signaling for a UE, the UE is assumed to perform interference measurements for the CSI report based on CRS.
[0284] In one embodiment, a dedicated signal to configure interference measurements for a UE can be signaled together with CSI-RS configurations. For example, in a CSI-RS configuration, a field can be added to indicate for which CQI report (s) this CSI-RS resource (s) should be used for measurement of interference. The CQI report (s) can be configured in a separate flag and can be indexed, and the indication can be based on the report's index (s) ( s) CQI. However, when a CSIRS resource is changed / added / removed, it may be appropriate to reconfigure CQI reports. When a CQI report is to be reconfigured / added / removed, it can be
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149/179 appropriate to signal the CSI-RS settings again since some CQI configuration information is signaled with a CSI-RS configuration.
[0285] In one embodiment, a dedicated signal to configure interference measurements for a UE can be sent together with CQI reporting configurations. For example, in a CQI report configuration, a field can be added to indicate which CSI-RS resource (s) (ZP or NZP) should be used for interference measurements for this CQI report. The CSI-RS resource (s) to be used for interference measurements can be configured in a separate signal and can be indexed, and the indication can be based on index (s) of the resource (s). In this case, if the CQI report is reconfigured / added / removed, it may be appropriate or not to signal the CSI-RS settings again. In one embodiment, a dedicated signal to configure interference measurements for a UE can be sent separately from the CQI / CSI-RS configuration signal, which can be a bitmap linking the CQI reports to the associated CSI-RS resources for measurements of interferences, or a bitmap linking the CSI-RS resources for interference measurements to the associated CQI reports. The indication can be based on the resource index (s) and the CQI report index (s). In this case, if the CQI report is reconfigured / added / removed, it may be appropriate or not to flag the CSIRS settings again.
[0286] Additionally, a UE can be assumed to perform interference measurements for a CSI report
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150/179 on the RS resource (s) (including CRS, CSI-RS) indicated (s) via dedicated flagging for the CSI report if flagging is discovered, and otherwise on CRS. In addition, if a resource-restricted measurement subset is flagged, then the UE can be assumed to also restrict its interference measurements within the indicated subset. In one embodiment, an eNB (or other network node) can configure three CSI-RS resources for a UE, and a CSI-RS resource can be assigned without a CQI report for signal measurements and without interference measurements. In a case like this, the UE is not assumed to perform any measurements on this resource until otherwise signaled by an eNB (or another network node).
[0287] For example, for PDSCH reception, the UE can be assumed to perform matching and / or rate discarding the REs indicated as resources for interference measurements, but associated without a CQI report. In these REs, the eNB may decide to transmit signals not limited to the CSI-RS signaled content, but may choose to prevent entry (for example, so that a CSI-RS resource from another point / cell can transmit without interference from this point / cell ), or transmit special signals (for example, so that a CSI-RS resource from another point / cell can perceive the desired interference from that point / cell and a UE can perform the desired interference measurements). If an NZP CSI-RS resource is signaled to a UE for interference measurements, the UE can also be informed via dedicated signaling whether the UE is assumed to remove the signal from that CSI-RS or not when performing interference measurements. This assumption can be indicated using
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151/179 one bit in the dedicated signaling. In addition, a CSI-RS feature signaled to a UE for interference measurements can be associated with a unique CSI-RS index either explicitly or implicitly. For example, CRS resource can be implicitly indexed as 0.
[0288] With reference to configuration and CSI calculation, an eNB (or another network node) allows one or multiple CQI reports to be configured for a UE through dedicated signaling. In one embodiment, the total number of CQI reports for a UE is configured using dedicated signaling. In another embodiment, the maximum number of CQI reports for a UE is predefined in standard specifications such as, for example, 2, or 3 or 4, or more CQI reports for a UE. In another embodiment, an eNB does not explicitly specify a limit on the maximum number of CQI reports for an UE. In some embodiments, an eNB (or other network node) may allow a CQI report for a UE to be configured, such as by means of dedicated signaling, to be periodic with a reporting period, subframe shift, and Channel mode Physical Uplink Control (PUCCH), and / or to be aperiodic with a PUSCH mode.
[0289] When multiple CQI reports are to be fed back based on multiple CSI-RS resources and possibly CRS resources, it may be appropriate to link a CQI report to the reference signals appropriately, for example, via dedicated signaling. For example, for an UE, an eNB (or other network node) may allow a CQI report to be configured based on signal / channel measurements from CRS resources such as in Release 10 or in
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152/179 signal / channel measurements of zero, one or multiple NZP CSI-RS resources, and based on interference measurements from CRS resources as in Release 10 or interference measurements from zero, one or multiple NZP resources and / or ZP CSI-RS. If signaling to link CQI with RS to a UE is not discovered for a CQI report, the UE can be assumed to compute the CRS-based CQI report.
[0290] NZP CSI-RS for IM is supported in Release 15 as a key element to facilitate link adaptation based on polling / pre-scaling / emulation for MU-MIMO and other applications. One problem is the subband measurement assumption / behavior when NZP CSI-RS for IM is configured, where a subband includes 4, 8, 16 or 32 PRBs depending on the bandwidth and configuration. However, EU matching and / or NZP CSI-RS classification / pre-coding in general can be different for different sub-bands. For example, each Pre-Coding Resource Block (PRG) Group (for example, including 2 or 4 PRBs or broadband) can have a pre-coding different from any other PRG. Calculating averages across EU-matched sub-bands and / or different NZP CSI-RS classification / pre-coding may not generate any significant measurement results for a sub-band. Thus, in certain modalities, it may be appropriate to prohibit calculating averages through sub-bands with EU matching and / or different NZP CSI-RS classification / precoding.
[0291] Although CSI subband reporting is supported (see, for example, 5.2.1.4 of TS 38.214), the standard does not define EU assumptions in the subband pre-coding and also does not regulate sub measurement behavior -band of
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HUH. That is, for broadband or subband reporting, typically the UE first generates a measurement for each subband, and then derives reporting of one or more quantities (for example, CQI) for each subband. In the first step, the sub-band measurement can be generated based on the current sub-band or multiple sub-bands, which is not specified in the standards. So in general it is up to the UE implementation, and for some UE implementations, the UE can use some other sub-bands to generate a sub-band report, and for some UE implementations, the UE can use some other sub-bands to generate a sub-band measurement, which can result in erroneous results. The following describes some possible ways to reduce or eliminate these erroneous results.
[0292] In one embodiment, if NZP CSI-RS for IM is configured and CQI reporting without PMI is configured, the UE can interpret that each subband in the CSI reporting band can be associated with a signal transmission assumption (associated with NZP for CM) and an assumption of interference transmission (associated with NZP for IM) different from those in any other sub-bands. As a result, the UE would not blindly perform processing across multiple sub-bands when estimating signal / interference in NZP CSI-RS resources. This mode specifies UE assumptions for your measurement operations.
[0293] In one embodiment, the signal transmission assumption indicated above is the NZP port precoding EU assumption. In other words, if interference measurement is performed on NZP CSI-RS and if the CSI
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Associated ReportConfig is configured with the highest reportQuantity layer parameter set to 'cri-RICQI', the UE can assume that, for a subband of the CSI reporting band, a pre-coding matrix is applied to form the ports of the NZP CSI-RS feature different from the pre-coding matrix in any other subband of the CSI reporting band, for channel measurement. Likewise, the UE can assume that, for a subband of the CSI reporting band, a pre-coding matrix is applied to form the NZP CSI-RS resource ports different from the pre-coding matrix in any other sub-band of the CSI reporting band, for channel measurement.
[0294] In one embodiment, granularity in the frequency domain is not sub-bands, but PRG of the associated DMRS, a grouping of a number (for example, 2, 4 or 8) of sub-bands, or a number of sub-bands as signaled by the network. For a UE configured with a CSI-ReportConfig with the highest reportQuantity layer parameter set to 'cri-RI-CQI', the standard (TS 38.214) specifies that, when calculating the CQI for a rating, the UE should use the ports indicated for this classification for the selected CSIRS resource, and the pre-encoder for the indicated ports must be assumed to be the matrix identity. This does not contradict the assumption in this modality, since the pre-coding matrix applied to form the NZP ports is not necessarily the pre-coding matrix assumed by the UE for the NZP ports to derive CQI.
[0295] In one embodiment, if NZP CSI-RS for IM is configured and CQI reporting without PMI is configured, the UE can interpret that within each subband in the
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155/179 CSI report there is an assumption of signal transmission and an assumption of interference transmission. As a result, the UE can perform processing within a subband when estimating signal / interference in NZP CSI-RS resources. This modality specifies UE assumption for its measurement operations. In other words, the UE can assume a common pre-coding to form the NZP ports within a subband, and if the UE tries to incorporate NZP into other subbands to aid measurement in that subband, the UE has check validity based on the NZP received in these sub-bands. If the UE can infer that multiple sub-bands have the same pre-coding forming the gates, the UE can average / process through these sub-bands for a sub-band measurement, otherwise the UE will restrict the measurement with NZP based on the subband. Similarly, as above, the granularity in the frequency domain can be different from sub-bands. Therefore, when a UE is configured with NZP CSI-RS to measure interference and the associated reporting amount is criRI-CQI, the UE can assume that for PRBs within a subband of the CSI reporting band, a a single pre-coding matrix is applied to form the ports for the NZP CSI-RS resources for channel measurement, and a single pre-coding matrix is applied to form the ports for the NZP CSI-RS resources for interference measurement.
[0296] In one mode, if NZP CSI-RS for IM is configured and sub-band CQI reporting is configured,
the UE can to interpret that each sub- -band in the band in reporting CSI it is associated with an assumption in streaming in signal and an assumption in streaming in
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156/179 interference different from those in another subband. That is, when a UE is configured with NZP CSI-RS resource for interference measurement and cqi-FormatIndicator is configured as sub-bandCQI, the UE can assume different pre-coding in each sub-band within the CSI reporting band for NZP resources CSI-RS for channel measurement and NZP CSI-RS features for interference measurement. Additionally or alternatively, the UE may assume that, for PRBs within a subband of the CSI reporting band, a single pre-coding matrix is applied to form the ports for NZP CSIRS resources for channel measurement, and a single pre-coding matrix is applied to form the ports for NZP CSI-RS features for interference measurement. Similar as above, the granularity in the frequency domain can be different from sub-bands.
[0297] In one embodiment, the UE behavior can be specified to restrict its measurement in the frequency domain (for example, for each subband) according to the measurement restriction setting or other combination of settings such as NZP CSI- RS for IM and CQI reporting without PMI. Note that subband measurement is applicable for subband reporting and broadband reporting. Therefore, if interference measurement is performed on NZP CSI-RS and if the associated CSI-ReportConfig is configured with the highest reportQuantity layer parameter set to 'cri-RI-CQI', a UE can restrict its measurement within each sub -band of the CSI reporting band for the NZP CSI-RS resource for channel measurement and the NZP CSI-RS resources for interference measurement. In this context, restriction is
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157/179 refers to the measurement resources within a subband that can be used to derive the measurement result for that subband.
[0298] In a modality that can be combined with any of the previously exposed modalities, if there is a problem with the subband measurement accuracy because of the low density of NZP CSI-RS, the network can configure the largest size subband (for example, eight PRBs in a subband instead of four PRBs in a subband). The network can restrict polling to poll with the largest PRG size (for example, four PRBs). In addition, a grouping of a number (for example, 2, 4 or 8) of sub-bands can be pre-specified, or a grouping of a number (for example, 2, 4 or 8) of sub-bands can be determined by NZP density (for example, equal to N / density, where N can be 12 or 24 associated with DMRS density), or a number of sub-bands as signaled by the network associated with a reporting configuration, based on which the EU assumptions indicated above or measurement restriction in the EU frequency domain is applied.
[0299] In a modality that can be combined with any of the modalities discussed above, the combination of configuration conditions resulting in the UE assumptions or UE behavior indicated above can be replaced by one or more of the following: 1) a signal (RRC, MAC or DCI) which specifies a polling / prescaling mode, such as connecting the report to a PDSCH / DMRS, projected signaling indicated above for polling, etc .; 2) a signal (RRC, MAC or DCI) that
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158/179 specifies a subband measurement assumption (or any other granularity in the frequency domain); 3) a signal (RRC, MAC or DCI) that specifies a subband report (or any other granularity in the frequency domain); 4) interference measurement that is performed in NZP CSI-RS; 5) a CSI-ReportConfig that is configured with the highest layer parameter reportQuantity set to 'cri-RI-CQI'; 6) CSI-RS aperiodic; 7) aperiodic CSI reporting; or 8) a signal (RRC, MAC or DCI) that specifies a subband measurement restriction (or any other granularity in the frequency domain). In certain embodiments, the UE assumption or subband UE behavior can be applied for interference measurement, only channel / signal measurement or both (which can use one or two signals as given above; for example, a for both channel and interference, or one for channel and the other for interference).
[0300] Figure 27 illustrates an example method 2700 in which a combination of UE behaviors is implemented, according to certain modalities of this disclosure. The method starts at step 2702. NZP CSI-RS for IM is configured and CQI reporting without PMI is configured and subband CQI reporting is configured.
[0301] In step 2704, the UE determines whether it is configured with a first configuration. In certain embodiments, the first configuration is using NZP CSI-RS for interference measurement. If the UE determines that it is not configured with the first configuration (for example, that NZP CSI-RS for IM is not configured), then in step 2706, the UE applies an assumption / without restriction of UE
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159/179 broadband, as described above.
[0302] Returning to step 2704, if the UE determines that it is configured with the first configuration (for example, that NZP CSI-RS for IM is configured), then the UE proceeds to step 2708.
[0303] In step 2708, the UE determines whether it is configured with a second configuration. In certain embodiments, the second configuration is CQI reporting without PMI. As another example, the second configuration can be subband CQI reporting. If the UE determines that it is not configured with the second configuration (for example, that CQI reporting without PMI is not configured or that subband CQI reporting is not configured), then the method proceeds to step 2706 in which the UE applies an assumption / without EU broadband restriction, as described above.
[0304] Returning to step 2708, if the UE determines that it is configured with the second configuration (for example, that CQI reporting without PMI is configured or that subband CQI reporting is configured), then the UE proceeds to step 2710. In step 2710, the UE applies a subband UE assumption / constraint, as previously described.
[0305] Although particular configurations are described for the first and second configurations, this disclosure considers any suitable configurations, such as those described above, to be the first and second configurations. Additionally, although the particular configurations described with reference to the method in figure 27 are designated as the first and second configurations,
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160/179 this disclosure considers inversion in which of these configurations is the first and which is the second, as appropriate. In addition, the example method shown in figure 27 includes the combination of two configurations. This disclosure, however, considers a UE being implemented with one configuration or multiple configurations (different from those described or in addition to them with reference to the 2700 method), including any of the possible configurations described previously. The assumption of UE, UE behavior and associated modality subband measurement constraint have also been listed previously.
[0306] In one embodiment, if a poll reference signal (SRS) is associated with an NZP CSI-RS resource via spatialRelationlnfo, then subband measurement applied to NZP results in SRS subband precoding , with the same granularity in the frequency domain.
[0307] In one embodiment, if reportQuantity is set to 'cri-RI-CQI', a classification indicator (RI) restriction can be flagged. The RI constraint can be an 8-bit bitmap configured in CSIReportConfig to specify which rating (s) from rating 1 to rating 8 is (are) selected, where the bit of order i (from 0 to 7) is for the classification i + 1. The UE performs measurements for the permitted Ris and does not perform measurements for other Ris (for example, the ports / layers associated with the bitmap location set to be 1 are used by the UE). Based on these measurements, the UE selects an IR and associated CRI / RI for reporting. The RI constraint bitmap can be a new field in CSIReportConfig, or it can reuse the typel-SinglePanel-ri
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Restriction in CodebookConfig (the UE ignores other fields in CodebookConfig). Multiple CSI-ReportConfig can be associated with the same PortIndexFor8Ranks if they are based on the same NZP, but each has its own RI constraint to specify different classifications, which reduces signaling overhead.
[0308] Figure 28 illustrates an example method 2800 for wireless communication, according to certain modalities of this disclosure. For the purpose of this example, a UE is described as performing the steps of method 2800. The method starts at step 2802.
[0309] In step 2804, the UE receives an indication of a NZP CSI-RS feature set for channel measurement (CM) and interference measurement (IM). As an example, the NZP CSI-RS resource set indication for CM and IM can be received by the UE from a network node, such as a NodeB, an eNB, a gNB or any other suitable type of network node. A first subset of the NZP CSI-RS feature set can be configured for CM, and a second subset of the NZP CSI-RS feature set can be configured for IM. In certain embodiments, the indication of the NZP CSI-RS resource set for CM and IM includes an indication of the first subset of the NZP CSI-RS resource set configured for CM and the second subset of the NZP CSI-RS resource set configured for IM . As previously described, the first subset of NZP CSIRS resources and the second subset of NZP CSI-RS resources may or may not overlap.
[0310] In certain modalities, the UE receives (for example, from the network node) the indication of the first subset
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162/179 of NZP CSI-RS resources and the second subset of NZP CSI-RS resources through DCI. In addition or alternatively, the UE may receive (for example, from the network node) the indication of the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources through a combination of DCI and MAC signaling . In certain embodiments, DCI provides dynamic activation of one or more CSI reporting configurations.
[0311] In step 2806, the UE receives a feature set configuration for CSI-IM, which can affect the assumptions made by the UE for measuring interference. This disclosure further considers the UE to receive (for example, from a network node) a configuration of a measurement constraint associated with channel measurement, to receive (for example, from a network node) a configuration of a measurement restriction associated with interference measurement, or receiving (for example, from a network node) both a configuration of a measurement constraint associated with channel measurement and a configuration of a measurement constraint associated with interference measurement.
[0312] In step 2808, the UE performs a channel measurement on the first subset of the NZP CSI-RS resource set. For the extent that the UE has received (for example, from a network node) a configuration of a measurement constraint associated with channel measurement, the channel measurement performed in step 2808 can be performed according to the configuration received from the constraint measurement associated with channel measurement. Channel measurement can be performed in association with a CSI report.
[0313] In step 2810, the UE performs a measurement of
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163/179 interference at least in the second subset of the NZP CSI-RS feature set. The second subset of the NZP CSI-RS feature set can include one or more NZP CSIRS ports. In certain embodiments, the UE performs interference measurement according to one or more assumptions.
[0314] As a first example assumption, the UE can perform interference measurement according to an assumption that each NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds to an interference transmission layer. , and the interference measurement can be according to a set of energy ratios per resource element (EPRE), each associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set. In certain embodiments, each EPRE ratio in the EPRE ratio set in which each is associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set specifies an assumed ratio of a PDSCH EPRE to an EPRE of a signal NZP CSI-RS in the NZP CSI-RS feature.
[0315] As a second example assumption, the UE can perform interference measurement according to an assumption that another interference is not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the set of NZP CSI-RS resource corresponds is in the first subset of the NZP CSI-RS resource set and in the second subset of the NZP CSI-RS resource set.
[0316] As a third example assumption, to the extent that the UE received a feature set configuration for CSI-IM (for example, in step
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2806), the UE can perform interference measurement according to an assumption that other interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS resource set corresponds is in the feature set for CSI-IM.
[0317] In addition, the UE can perform interference measurement according to any suitable combination of the described assumptions as well as other assumptions.
[0318] To the extent that the UE has received (for example, from a network node) a configuration of a measurement constraint associated with interference measurement, the interference measurement performed in step 2810 can be performed according to the configuration received from the measurement constraint associated with the interference measurement. Interference measurement can be performed in association with a CSI report.
[0319] In step 2812, the UE can generate a CSI report based on the channel measurement (for example, performed in step 2808) and the interference measurement (for example, performed in step 2810). In certain embodiments, the CSI report includes at least one CQI, but not a PMI. It should be noted, however, that this disclosure considers the CSI report to include any appropriate combination of information, including a PMI if appropriate.
[0320] In step 2814, the UE can transmit the CSI report to the network. For example, the UE can transmit the CSI report to a network node, which may or may not be the same network node that transmitted the NZP CSI-RS resource pool to the UE in step 2804.
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[0321] In step 2816, the method ends.
[0322] Figure 29 illustrates an example method 2900 for wireless communication, according to certain modalities of this disclosure. For the purpose of this example, a network node is described as performing the steps of method 2900. For example, the network node can be a NodeB, an eNB, a gNB or any other suitable type of network node. The method starts at step 2902.
[0323] In step 2904, the network node can indicate to a UE a set of NZP CSI-RS resources for channel measurement (CM) and interference measurement (IM). A first subset of the NZP CSI-RS feature set can be configured for CM, and a second subset of the NZP CSI-RS feature set can be configured for IM. In certain embodiments, the indication of the NZP CSI-RS resource set for CM and IM includes an indication of the first subset of the NZP CSI-RS resource set configured for CM and the second subset of the NZP CSI-RS resource set configured for IM . As previously described, the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources may or may not overlap.
[0324] In certain modalities, the network node communicates (for example, to the UE) the indication of the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources through DCI. Additionally or alternatively, the network node can communicate (for example, to the UE) the indication of the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources through a combination of DCI and signaling MAC. In certain embodiments, DCI provides dynamic activation of one or more
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166/179 more CSI report configurations. Although particular techniques for the network node to indicate the NZP CSI-RS resource set, the first subset of the NZP CSI-RS resource set and the second subset of the NZP CSI-RS resource set are described, this disclosure considers the indicate these resources to the UE in any appropriate way.
[0325] In step 2906, the network node indicates to the UE a configuration of a set of resources for CSI-IM, which can affect the assumptions made by the UE for measuring interference.
[0326] In step 2908, the network node determines whether it is to provide a measurement constraint associated with channel measurement, a measurement constraint associated with interference measurement or both.
[0327] If the network node determines in step 2908 to provide a measurement restriction, then in step 2910 and depending on the type of measurement restriction the network node determines to provide, and the network node indicates one or more configuration configurations. one or more suitable types of measurement restrictions. For example, if the network node determines in step 2908 to provide a measurement constraint associated with channel measurement, then in step 2910 the network node indicates to the UE a configuration of a measurement constraint associated with channel measurement. As another example, if the network node determines in step 2908 to provide a measurement constraint associated with interference measurement, then in step 2910 the network node indicates to the UE a configuration of a measurement constraint associated with interference measurement. . As another example, if the node
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167/179 of the network determine in step 2 908 to provide both a measurement constraint associated with channel measurement and a measurement constraint associated with interference measurement, then in step 2910 the network node indicates to the UE both a configuration of a measurement constraint associated with channel measurement as well as a configuration of a measurement constraint associated with interference measurement.
[0328] Returning to step 2908, if the network node determines not to provide a measurement constraint, then the method proceeds to step 2912.
[0329] In step 2912, the network node receives a CSI report from the UE. The CSI report received is based on the channel measurement and interference measurement performed by the UE in response to the indication by the network node to the UE of NZP CSI-RS resources in step 2904.
[0330] For example, the UE may have performed channel measurement on the first subset of the NZP CSI-RS resource set. To the extent that the network node has indicated to the UE a configuration of a measurement constraint associated with channel measurement, the channel measurement performed by the UE may have been performed according to the indicated configuration of the measurement constraint associated with the channel measurement.
[0331] As another example, the UE may have performed interference measurement at least on the second subset of the NZP CSI-RS feature set. The second subset of the NZP CSI-RS feature set can include one or more NZP CSI-RS ports. In certain embodiments, the UE may have performed the interference measurement according to one or more assumptions.
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[0332] As a first example assumption, the UE may have performed interference measurement according to an assumption that each NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds to a transmission layer of interference, and the interference measurement can be according to a set of energy ratios per resource element (EPRE), each associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set. In certain embodiments, each EPRE ratio in the EPRE ratio set where each is associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set specifies an assumed ratio of a PDSCH EPRE to an EPRE of a signal NZP CSI-RS in the NZP CSI-RS feature.
[0333] As a second example assumption, the UE may have performed interference measurement according to an assumption that another interference is not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the array The NZP CSI-RS resource set corresponds to the first subset of the NZP CSI-RS resource set and the second subset of the NZP CSI-RS resource set.
[0334] As a third example assumption, to the extent that the network node indicated a feature set configuration for CSI-IM (for example, in step 2906), the UE may have performed the interference measurement of according to an assumption that another interference not associated with an interference transmission layer that an NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds to is in the feature set
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169/179 for CSI-IM.
[0335] In addition, the UE can perform interference measurement according to any suitable combination of the described assumptions as well as other assumptions.
[0336] To the extent that the network node indicated to the UE (for example, in step 2910) a configuration of a measurement constraint associated with interference measurement, the interference measurement performed by the UE may have been performed accordingly with the indicated configuration of the measurement constraint associated with interference measurement.
[0337] In certain embodiments, the CSI report includes at least one CQI, but not a PMI. It should be noted, however, that this disclosure considers the CSI report to include any appropriate combination of information, including a PMI if appropriate.
[0338] In step 2914, the network node can transmit data according to the received CSI report. For example, based on information included in the CSI report received from the UE, the network node can select appropriate resources to communicate with the UE.
[0339] In step 2916, the method ends.
[0340] Although this disclosure describes particular components as performing particular operations for the various methods and processes described in this disclosure, this disclosure considers other components performing these operations. Additionally, although this disclosure describes or illustrates particular operations for the various methods and processes described in this disclosure as occurring in a particular order, this disclosure considers any
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170/179 proper operations taking place in any suitable order. In addition, this disclosure considers any suitable operations to be repeated one or more times in any suitable order. While this disclosure describes or illustrates particular operations for the various methods and processes described in this disclosure as occurring in sequence, this disclosure considers any suitable operations occurring at substantially the same time, where appropriate. Any operation or appropriate sequence of operations described or illustrated in this document may be interrupted, suspended or otherwise controlled by another process, such as an operating system or core, where appropriate. Procedures can operate in an operating system environment or as stand-alone routines taking up all or a substantial part of system processing.
[0341] Figure 30 illustrates an example communication flow showing adaptation of MU-MIMO link based on NZP CSI-RS for interference measurement, according to certain modalities of this disclosure. The illustrated example includes three timelines 3002; a time line 3002a for a first UE 3004a (UE1), a time line 3002b for a gNB 3006 and a time line 3002c for a second UE 3004b (UE2). Although gNB 3006 is described as a gNB, this disclosure considers gNB 3006 to be any suitable type of network node.
[0342] UE1 transmits a CQI report to gNB 3006 in 3008a, and UE2 transmits a CQI report to gNB 3006 in 3008b. GNB 3006 performs multiple user matching in 3010. In 3012 (at time η), gNB 3006 polls UE1 and UE2, including transmitting appropriate resources to
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171/179 channel measurement and interference measurement for UE1 and UE2. For example, gNB transmits NZP CSIRS resources for interference measurement (NZP IMR 3014a) and NZP CSI-RS resources for channel measurement (NZP CMR 3016a) to UE1 and transmits NZP CSI-RS resources for interference measurement (NZP IMR 3014b) and NZP CSI-RS channel measurement capabilities (NZP CMR 3016b) for UE2. As previously described, several measurement restrictions can also be indicated by gNB 3006 as part of the survey process.
[0343] In response to interference and channel measurement capabilities, UE1 and UE2 perform derivation CQI 3022a and 3022b, respectively. This CQI derivation includes performing respective channel measurements and interference measurements using the resources indicated in 3012 (polling). As previously described, interference measurements can be performed according to one or more assumptions.
[0344] UE1 transmits another CQI report to gNB 3006 in 3024a, and UE2 transmits another CQI report to gNB 3006 in 3024b. Based on the information received in the CQI reports in 3024, gNB 3006 performs the transmission of multiple users 3026. The transmission can be a PDSCH. At 3028a and 3028b, respectively, UE1 and UE2 can receive the PDSCH transmission (at time n + k).
[0345] In the illustrated example, interference measurement capabilities at time n reflect interference from multiple users at time n + k. The channel measurement capabilities 3016a for the UE1 are the interference measurement capabilities 3014b for the UE2. In addition, NZP CSI-RS for measuring interference at time n is a
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172/179 pre-coded reference of an interferer (between cells or within cells), reflecting interference in time n + k.
[0346] Modalities of this disclosure can provide one or more technical advantages. In certain embodiments, configuring NZP CSI-RS features for interference measurement provides improved link adaptation performance. Certain modalities facilitate the use of a higher frequency spectrum. Certain modalities provide improved performance that is suitable for use with multiple input and multiple output (MIMO) systems and massive MIMO systems. Link adaptation according to certain modalities of this disclosure allows interference measurement capabilities in time n to reflect interference from multiple users in time n + k, with a channel measurement feature of a first UE being a measurement feature of interference from a second UE, which can be advantageous in a multi-user MIMO system. Certain modalities can improve performance in carrier aggregation / channel aggregation and in improving coverage.
[0347] Figure 31 is a block diagram of a 3100 processing system that can be used to implement the system, apparatus, devices and methods disclosed in this document, in accordance with certain modalities of this disclosure.
[0348] Specific devices may use all components shown, or only a subset of the components, and levels of integration may vary from device to device. In addition, a device can contain multiple instances of a component, such as multiple processing units, processors,
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173/179 memories, transmitters, receivers, etc. The processing system may comprise a 3102 processing unit equipped with one or more input / output devices, such as a speaker, microphone, mouse, touch screen, mini keyboard, keyboard, printer, display and more. Processing unit 3102 may include a central processing unit (CPU) 3104, memory 3106, a mass storage device 3108, a video adapter 3110 and an input / output interface 3112 connected to a bus.
[0349] The bus can be one or more of any type of various bus architectures including a memory bus or memory controller, a peripheral bus, video bus or the like. The 3104 CPU can comprise any type of electronic data processor. Memory 3106 can comprise any type of system memory such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), read-only memory (ROM), a combination of these or something like that. In one embodiment, memory 3106 may include ROM for use at startup, and DRAM for storing programs and data for use while running programs.
[0350] The mass storage device 3108 can comprise any type of storage device configured to store data, programs and other information and to make the data, programs and other information accessible via the bus. The mass storage device 3108 can comprise, for example,
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174/179 one or more of a solid state drive, hard disk drive, magnetic disk drive, optical disc drive, or the like.
[0351] The 3110 video adapter and the 3112 input / output interface provide interfaces for coupling external input and output devices to the 3102 processing unit. As illustrated, examples of input and output devices include a 3114 coupled display to the 3110 video adapter and a 3116 mouse / keyboard / printer attached to the 3112 input / output interface. Other devices can be attached to the 3102 processing unit, and more or less interface cards can be used. For example, a serial interface card (not shown) can be used to provide a serial interface for a printer.
[0352] Processing unit 3102 also includes one or more network interfaces 3118, which may comprise wired links, such as an Ethernet cable or the like, and / or wireless links for access nodes or different 3120 networks The 3118 network interface allows processing unit 3102 to communicate with remote units via 3120 networks. For example, the 3118 network interface can provide wireless communication through one or more transmitters / transmit antennas and one or more receiving receivers / antennas. In one embodiment, the processing unit 3102 is coupled to a local area network or a wide area network for data processing and communications with remote devices, such as other processing units, the Internet, remote storage structures or the like. similar.
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175/179
[0353] A modality processing system for performing methods described in this document is provided, which can be installed on a hosting device. The processing system can include a processor, memory and interfaces. The processor can be any component or collection of components adapted to perform computations and / or other related processing tasks, and memory can be any component or collection of components adapted to store programming and / or instructions for execution by the processor. In one embodiment, the memory includes a computer-readable non-transitory media. Interfaces can be any component or collection of components that allow the processing system to communicate with other devices / components and / or with a user. For example, one or more of the interfaces can be adapted to send data, control or management messages from the processor to applications installed on the hosting device and / or on a remote device. As another example, one or more of the interfaces can be adapted to allow a user or user device (eg, personal computer (PC), etc.) to interact / communicate with the processing system. The processing system may include additional components not shown in the figure, such as long-term storage (for example, non-volatile memory, etc.).
[0354] In some embodiments, the processing system is included in a network device that accesses or is otherwise part of a telecommunications network. In one example, the processing system is on a device
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176/179 network side on a wireless or wired telecommunications network, such as a base station, a relay station, a scheduler, a controller, a communication port, a router, an application server, or any another device on the telecommunications network. In other embodiments, the processing system is on a user-side device that accesses a wireless or wired telecommunications network, such as a mobile station, user equipment (UE), a personal computer (PC), a tablet, a usable communications device (for example, a smart watch, etc.), or any other device adapted to access a telecommunications network.
[0355] In some modalities, one or more of the interfaces connect the processing system to a transceiver adapted to transmit and receive signaling over the telecommunications network.
[0356] In some modalities, a transceiver adapted to transmit and receive signaling over a telecommunications network is provided. The transceiver can be installed on the hosting device. The transceiver comprises a network side interface, a coupler, a transmitter, a receiver, a signal processor and a device side interface. The network side interface can include any component or collection of components adapted to transmit or receive signaling over a wireless or wired telecommunications network. The coupler can include any component or collection of components adapted to facilitate bidirectional communication via the network side interface. THE
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The 177/179 transmitter can include any component or collection of components (eg, up converter, power amplifier, etc.) adapted to convert a baseband signal to a modulated carrier signal suitable for transmission via the side interface network. The receiver can include any component or collection of components (e.g., down converter, low noise amplifier, etc.) adapted to convert a carrier signal received via the network side interface to a baseband signal. The signal processor can include any component or collection of components adapted to convert a baseband signal to a data signal suitable for communication via the device side interface (s), or vice versa. The device side interface (s) may include any component or collection of components adapted to send signal data between the signal processor and components within the hosting device (e.g., the processing system, local area network (LAN) ports, etc.).
[0357] The transceiver can transmit and receive signaling through any type of communication media. In some embodiments, the transceiver transmits and receives signaling via wireless media. For example, the transceiver may be a wireless transceiver adapted for communication in accordance with a wireless telecommunications protocol, such as a cellular protocol (for example, long-term evolution (LTE), etc.), a wireless network protocol. wireless local area (WLAN) (e.g., Wi-Fi, etc.), or any other type of wireless protocol (e.g., Bluetooth, near field communication (NFC),
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178/179 etc.). In such embodiments, the network side interface comprises one or more antenna / radiator elements. For example, the network side interface can include a single antenna, multiple separate antennas, or a set of multiple antennas configured for multilayer communication, for example, single input, multiple outputs (SIMO), multiple inputs, single output ( MISO), multiple inputs, multiple outputs (MIMO), etc. In other modalities, the transceiver transmits and receives signaling through a wired media, for example, twisted pair cable, coaxial cable, optical fiber, etc. Specific processing systems and / or transceivers may use all components shown, or only a subset of the components, and levels of integration may vary from device to device.
[0358] It should be noted that one or more steps of the modalities methods provided in this document can be performed by corresponding units or modules. For example, a signal can be transmitted by a transmission unit or a transmission module. A signal can be received by a receiving unit or by a receiving module. A signal can be processed by a processing unit or a processing module. Other steps can be carried out by a display unit / module, a measuring unit / module and / or by a determination unit / module. The respective units / modules can be hardware, software or a combination of them. For example, one or more of the units / modules can be an integrated circuit, such as field programmable port arrays (FPGAs) or circuits
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179/179 application-specific integrated (ASICs).
[0359] Although this disclosure has been described with reference to illustrative modalities, this description is not proposed to be interpreted with a sense of limitation. Various modifications and combinations of the illustrative modalities, as well as other disclosure modalities, will be apparent to those skilled in the art by reference to the description. Therefore, the appended claims are intended to cover any such modifications or modalities.
[0360] For example, the various elements or components can be combined or integrated into another system or certain features can be omitted, or not implemented. In addition, techniques, systems, subsystems and methods described and illustrated in the various modalities as distinct or separate can be combined or integrated with other systems, modules, techniques or methods without departing from the scope of this disclosure. Other items shown or described as coupled or coupled directly or communicating with each other can be coupled indirectly or communicating through some interface, device or intermediate component, whether electrically, mechanically or otherwise. Other examples of changes, substitutions and alterations are determinable by those skilled in the art and can be made without departing from the spirit and scope revealed in this document.

权利要求:
Claims (21)
[1]
1. Method, by means of a user equipment (UE) for wireless communications, the method characterized by the fact that:
perform a channel measurement associated with a channel status information (CSI) report on a first subset of a set of non-zero power CSI (CSI-RS) reference signal resources (NZP) (NZP CSIRS);
perform an interference measurement associated with the CSI report on at least a second subset of the NZP CSI-RS resource set, the second subset of the NZP CSI-RS resource set comprising one or more NZP CSI-RS ports, the interference measurement performed according to assumptions comprising: each NZP CSIRS port in the second subset of the NZP CSIRS resource set corresponds to an interference transmission layer, the interference measurement being according to a set of energy ratios per resource element (EPRE ), each associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set, and another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the set of NZP CSI-RS resources corresponds to is in the first subset of the NZP CSIRS resource set and in the second subset of the NZP CSIRS resource set;
generate the CSI report based on channel measurement and interference measurement; and transmit the CSI report to a network.
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[2]
2. Method, according to claim 1, characterized by the fact that the CSI report comprises at least one channel quality indicator (CQI), but not a pre-coding matrix indicator (PMI).
2/21
[3]
3/21
3. Method, according to claim 1 or 2, characterized by the fact that each EPRE ratio in the EPRE ratio set in which each is associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set specifies an assumed ratio of a downlink shared physical channel EPRE (PDSCH) to an EPRE of an NZP CSI-RS signal on the NZP CSI-RS resource.
[4]
4/21
4. Method according to any one of claims 1 to 3, characterized by the fact that:
the method additionally comprises receiving a configuration of a set of features for measuring CSI interference (CSI-IM); and the assumptions according to which the interference measurement is performed further comprise that another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds is at feature set for CSI-IM.
[5]
5/21 generate the CSI report based on channel measurement and interference measurement; and transmit the CSI report to a network.
Method according to any one of claims 1 to 4, characterized in that it additionally comprises receiving a measurement restriction configuration associated with channel measurement.
[6]
6/21
6. Method according to any one of claims 1 to 5, characterized in that it additionally receives a measurement restriction configuration associated with interference measurement.
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[7]
7/21
24. UE, according to claim 22 or 23, characterized by the fact that DCI provides a dynamic activation of one or more CSI reporting configurations.
25. Computer readable non-transient storage medium storing programming for execution by one or more processors, characterized by the fact that the programming includes instructions for:
perform a channel measurement associated with a channel status information (CSI) report on a first subset of a set of non-zero power CSI (CSI-RS) reference signal resources (NZP) (NZP CSIRS);
perform an interference measurement associated with the CSI report on at least a second subset of the NZP CSI-RS resource set, the second subset of the NZP CSI-RS resource set comprising one or more NZP CSI-RS ports, the interference measurement performed according to assumptions comprising: each NZP CSIRS port in the second subset of the NZP CSIRS resource set corresponds to an interference transmission layer, the interference measurement being according to a set of energy ratios per resource element (EPRE ), each associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set, and another interference not associated with the interference transmission layer corresponding to an NZP CSI-RS port in the second subset of the set of NZP CSI-RS resources is in the first subset of the NZP CSI-RS resource set and in the second subset of the NZP CSI-RS resource set;
generate the CSI report based on the channel measurement and
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7. Method according to any one of claims 1 to 6, characterized by the fact that the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources overlap.
[8]
8/21 interference measurement; and transmit the CSI report to a network.
26. Computer readable non-transient storage medium according to claim 25, characterized by the fact that the CSI report comprises at least one channel quality indicator (CQI), but no pre-coding matrix indicator (PMI ).
27. Computer readable non-transient storage medium according to claim 25 or 26, characterized by the fact that each EPRE ratio in the EPRE ratio set in which each is associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set specifies an assumed ratio of a downlink shared physical channel EPRE (PDSCH) to an EPRE of an NZP CSI-RS signal on the NZP CSI-RS resource.
28. Computer readable non-transient storage medium according to any one of claims 25 to 27, characterized by the fact that:
the programming additionally includes instructions for receiving a configuration of a set of features for measuring CSI interference (CSI-IM); and the assumptions according to which the interference measurement is performed further comprise that another interference not associated with the interference transmission layer corresponding to an NZP CSI-RS port in the second subset of the NZP CSI-RS feature set is in the set of resources for CSI-IM.
29. Computer readable non-transient storage medium according to any of claims 25 to 28, characterized by the fact that the programming includes
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8. Method according to any one of claims 1 to 7, characterized by the fact that it additionally receives, by the UE, from a network node, an indication of the NZP CSI-RS resource set for channel measurement and measurement of interference, the indication indicating the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources.
[9]
9/21 additionally instructions for receiving a metering restriction setting associated with channel metering.
30. Computer readable non-transient storage medium according to any one of claims 25 to 29, characterized in that the programming additionally includes instructions for receiving a measurement restriction configuration associated with interference measurement.
31. Computer readable non-transient storage medium according to any one of claims 25 to 30, characterized by the fact that the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources overlap.
32. Computer readable non-transient storage medium according to any one of claims 25 to 31, characterized by the fact that the programming additionally includes instructions for receiving, from a network node, an indication of the NZP CSI- RS for channel measurement and interference measurement, the indication indicating the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources.
33. Computer readable non-transient storage medium according to claim 32, characterized by the fact that the network node comprises a NodeB, an evolved NodeB (eNB) or a next generation NodeB (gNB).
34. Computer readable non-transient storage medium according to claim 32 or 33, characterized by the fact that the indication of the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources is received from the node through downlink control (DCI) information.
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9. Method according to claim 8, characterized by the fact that the network node comprises a NodeB, an evolved NodeB (eNB) or a next generation NodeB (gNB).
[10]
10/21
35. Computer readable non-transitory storage media according to claim 32 or 33, characterized by the fact that the indication of the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources is received from the node network through a combination of downlink control (DCI) information and media access control (MAC) signaling.
36. Computer readable, non-transitory storage media according to claim 34 or 35, characterized by the fact that DCI provides dynamic activation of one or more CSI reporting configurations.
37. Method, through a wireless network node, the method characterized by the fact that:
indicate, by a network node for a user equipment (UE), a set of non-zero power (CSP) channel status information (CSIR) reference signal (CSI) resources (NZP CSI-RS) for channel measurement and interference measurement, a first subset of the NZP CSI-RS feature set being configured for channel measurement and a second subset of the NZP CSI-RS feature set being configured for interference measurement; and receive, by the network node, a CSI report from the UE, the CSI report being based on the channel measurement and interference measurement, the channel measurement having been performed by the UE on the first subset of the NZP CSIRS feature set and the measurement of interference having been performed by the UE on the second subset of the NZP CSI-RS feature set and according to assumptions comprising that: each NZP port
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10. Method, according to claim 8 or 9, characterized by the fact that the UE receives from the network node the indication of the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources by means of information downlink control (DCI).
[11]
11/21
CSI-RS in the second subset of the NZP resource set CSI-RS corresponds to an interference transmission layer, the interference measurement being according to a set of energy ratios per resource element (EPRE), each associated with a NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set, and another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS resource set is in the first subset of the NZP CSI-RS resource set and in the second subset of the NZP CSI-RS resource set.
38. Method, according to claim 37, characterized by the fact that the CSI report comprises at least one channel quality indicator (CQI), but not a pre-coding matrix indicator (PMI).
39. Method according to claim 37 or 38, characterized by the fact that each EPRE ratio in the EPRE ratio set in which each is associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set specifies an assumed ratio of a downlink shared physical channel EPRE (PDSCH) to an EPRE of an NZP CSI-RS signal on the NZP CSI-RS resource.
40. Method according to any of claims 37 to 39, characterized by the fact that:
the method additionally comprises indicating, through the network node to the UE, a configuration of a set of resources for measuring CSI interference (CSI-IM); and the assumptions according to which the interference measurement is performed further comprise that
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11. Method according to claim 8 or 9, characterized by the fact that the UE receives from the network node the indication of the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources by means of a combination of downlink control (DCI) information and media access control (MAC) signaling.
[12]
12/21 other interference not associated with an interference transmission layer to which an NZP CSI-RS port on
second subset of NZP CSI-RS feature set
corresponds to is in the feature set for CSI-IM.
41. Method, of according to any of the
claims 37 to 40, characterized by the fact that
additionally indicates, by the network node to the UE, a
measurement constraint configuration associated with channel measurement.
42. Method, of according to any of the
claims 37 to 41, characterized by the fact that
additionally indicates, by the network node to the UE, a
measurement constraint configuration associated with interference measurement.
43. Method, of according to any of the claims 37 to 42, characterized by the fact that the knot
network interface comprises a NodeB, an evolved NodeB (eNB) or a
Next generation NodeB (gNB).
44. Method, of according to any of the claims 37 to 43, , characterized by the fact that the
first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources overlap.
45. Method, of according to any of the claims 37 to 44, characterized by the fact that the knot
network indicates to the UE the first subset of resources
NZP CSI-RS and the second subset of NZP CSI-RS resources through information downlink control
(DCI).
46. Method, of according to any of the claims 37 to 44, characterized by the fact that the knot
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12. Method according to claim 10 or 11, characterized by the fact that the DCI provides a dynamic activation of one or more CSI reporting configurations.
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[13]
13/21 network indicates to the UE the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources through a combination of downlink control (DCI) information and access control signaling to media (MAC).
47. Method according to claim 45 or 46, characterized by the fact that DCI provides dynamic activation of one or more CSI reporting configurations.
48. Network node, characterized by the fact that:
one or more processors; and a computer readable non-transitory storage medium storing programming for execution by one or more processors, the programming including instructions for:
indicate, by a network node for user equipment (UE), a set of non-zero power (CSI) channel status information (CSIR) reference signal (CSI) resources (NZP CSI-RS) for channel measurement and interference measurement, a first subset of the NZP CSI-RS feature set being configured for channel measurement and a second subset of the NZP CSI-RS feature set being configured for interference measurement; and receive, by the network node, a CSI report from the UE, the CSI report being based on the channel measurement and interference measurement, the channel measurement having been performed by the UE on the first subset of the NZP CSIRS feature set and the measurement of interference having been performed by the UE on the second subset of the NZP CSI-RS resource set and according to assumptions comprising that: each NZP CSI-RS port on the second subset of the NZP resource set
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13 to 17, characterized by the fact that the programming additionally includes instructions for receiving a measurement restriction configuration associated with interference measurement.
13. User equipment (UE), characterized by the fact that:
one or more processors; and a computer readable non-transitory storage medium storing programming for execution by one or more processors, the programming including instructions for:
perform a channel measurement associated with a channel status information (CSI) report on a first subset of a set of non-zero power CSI (CSI-RS) reference signal resources (NZP) (NZP CSI-RS );
perform an interference measurement associated with the CSI report on at least a second subset of the NZP CSI-RS resource set, the second subset of the NZP CSI-RS resource set comprising one or more NZP CSI-RS ports, the interference measurement performed according to assumptions comprising that: each NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds to an interference transmission layer, the interference measurement being according to a set of energy ratios per element resource (EPRE), each associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set, and another interference not associated with the interference transmission layer corresponding to an NZP CSI-RS port in the second a subset of the NZP CSI-RS feature set is in the first subset of the NZP CSI-RS feature set and in the second subset of the NZP CSI-RS feature set;
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[14]
14/21
CSI-RS corresponds to an interference transmission layer, the interference measurement being according to a set of energy ratios per resource element (EPRE), each associated with an NZP CSI-RS resource in the second subset of the set of NZP CSI-RS resources, and other interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS resource set is in the first subset of the NZP CSI-RS resource set and the second subset of the NZP CSI-RS resource set.
49. Network node, according to claim 48, characterized by the fact that the CSI report comprises at least one channel quality indicator (CQI), but not a pre-coding matrix indicator (PMI).
50. Network node according to claim 48 or 49, characterized by the fact that each EPRE reason in the EPRE reason set in which each is associated with an NZP CSI-RS resource in the second subset of the NZP CSI resource set -RS specifies an assumed ratio of a downlink shared physical channel EPRE (PDSCH) to an EPRE of an NZP CSI-RS signal on the NZP CSI-RS resource.
51. Network node according to any one of claims 48 to 50, characterized by the fact that:
the programming additionally includes instructions for indicating, through the network node to the UE, a configuration of a set of resources for measuring CSI interference (CSIIM); and the assumptions according to which the measurement of
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14. UE, according to claim 13, characterized by the fact that the CSI report comprises at least one channel quality indicator (CQI), but no pre-coding matrix indicator (PMI).
[15]
15/21 interference is performed further comprise that another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds is in the feature set for CSI-IM.
52. Network node according to any one of claims 48 to 51, characterized in that the programming additionally includes instructions for indicating, by the network node to the UE, a measurement restriction configuration associated with channel measurement.
53. Network node according to any one of claims 48 to 52, characterized in that the programming additionally includes instructions for indicating, by the network node to the UE, a measurement restriction configuration associated with interference measurement.
54. Network node according to any one of claims 48 to 53, characterized by the fact that the network node comprises a NodeB, an evolved NodeB (eNB) or a next generation NodeB (gNB).
55. Network node according to any one of claims 48 to 54, characterized by the fact that the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources overlap.
56. Network node according to any of claims 48 to 55, characterized by the fact that the network node indicates to the UE the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources by downlink control (DCI) information medium.
57. Network node, according to any of the
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15. UE according to claim 13 or 14, characterized by the fact that each EPRE ratio in the EPRE ratio set in which each is associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set specifies an assumed ratio of a downlink shared physical channel EPRE (PDSCH) to an EPRE of an NZP CSI-RS signal on the NZP CSI-RS resource.
[16]
16/21 claims 48 to 55, characterized by the fact that the network node indicates to the UE the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources through a combination of information control downlink (DCI) and media access control (MAC) signaling.
58. Network node according to claim 56 or 57, characterized by the fact that DCI provides dynamic activation of one or more CSI reporting configurations.
59. Computer readable non-transient storage medium storing programming for execution by one or more processors, characterized by the fact that the programming includes instructions for:
indicate, by a network node for user equipment (UE), a set of non-zero power (CSI) channel status information (CSIR) reference signal (CSI) resources (NZP CSI-RS) for channel measurement and interference measurement, a first subset of the NZP CSI-RS feature set being configured for channel measurement and a second subset of the NZP CSI-RS feature set being configured for interference measurement; and receive, by the network node, a CSI report from the UE, the CSI report being based on the channel measurement and interference measurement, the channel measurement having been performed by the UE on the first subset of the NZP CSIRS feature set and the measurement of interference having been performed by the UE on the second subset of the NZP CSI-RS resource set and according to assumptions comprising that: each NZP CSI-RS port on the second subset of the NZP resource set
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16. UE according to any of claims 13 to 15, characterized by the fact that:
the programming additionally includes instructions for receiving a configuration of a set of features for measuring CSI interference (CSI-IM); and the assumptions according to which the interference measurement is performed further comprise that another interference not associated with the interference transmission layer corresponding to an NZP CSI-RS port in the second subset of the NZP CSI-RS feature set is in the set of resources for CSI-IM.
[17]
17/21
CSI-RS corresponds to an interference transmission layer, the interference measurement being according to a set of energy ratios per resource element (EPRE), each associated with an NZP CSI-RS resource in the second subset of the set of NZP CSI-RS resources, and other interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS resource set is in the first subset of the NZP CSI-RS resource set and the second subset of the NZP CSI-RS resource set.
60. Computer readable non-transient storage medium according to claim 59, characterized by the fact that the CSI report comprises at least one channel quality indicator (CQI), but not a pre-coding matrix indicator ( PMI).
61. Computer readable non-transient storage medium according to claim 59 or 60, characterized by the fact that each EPRE ratio in the EPRE ratio set in which each is associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set specifies an assumed ratio of a downlink shared physical channel EPRE (PDSCH) to an EPRE of an NZP CSI-RS signal on the NZP CSI-RS resource.
62. Computer readable non-transient storage medium according to any one of claims 59 to 61, characterized by the fact that:
the programming additionally includes instructions to indicate, by the network node for the UE, a configuration of a set of resources for measuring CSI interference (CSIPetition 870190034020, from 09/09/2019, page 215/246
17. UE according to any one of claims 13 to 16, characterized in that the programming additionally includes instructions for receiving a measurement restriction configuration associated with channel measurement.
[18]
18/21
IM); and the assumptions according to which the interference measurement is performed further comprise that another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds is at feature set for CSI-IM.
63. Computer-readable non-transient storage medium according to any of claims 59 to 62, characterized in that the programming additionally includes instructions for indicating, by the network node to the UE, an associated measurement restriction configuration with channel measurement.
64. Computer-readable non-transient storage media according to any one of claims 59 to 63, characterized in that the programming additionally includes instructions for indicating, by the network node to the UE, an associated measurement restriction configuration with interference measurement.
65. Computer readable non-transitory storage media according to any of claims 59 to 64, characterized by the fact that the network node comprises a NodeB, an evolved NodeB (eNB) or a next generation NodeB (gNB) .
66. Computer readable non-transitory storage media according to any of claims 59 to 65, characterized by the fact that the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources overlap.
67. Non-transitory storage media readable by
Petition 870190034020, of 09/09/2019, p. 216/246
18. EU, according to any of the claims
Petition 870190034020, of 09/09/2019, p. 203/246
[19]
19/21 computer according to any one of claims 59 to 66, characterized by the fact that the network node indicates to the UE the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources by means of downlink control (DCI) information.
68. Computer readable non-transient storage medium according to any of claims 59 to 66, characterized by the fact that the network node indicates to the UE the first subset of NZP CSI-RS resources and the second subset of resources NZP CSI-RS through a combination of downlink control (DCI) information and media access control (MAC) signaling.
69. Computer readable, non-transitory storage media according to claim 67 or 68, characterized by the fact that DCI provides dynamic activation of one or more CSI reporting configurations.
70. Device for wireless communications, characterized by the fact that:
device for performing a channel measurement associated with a channel status information (CSI) report on a first subset of a set of non-zero power (NZP) CSI reference signal (CSI-RS) resources (NZP CSI -LOL);
device to perform an interference measurement associated with the CSI report on at least a second subset of the NZP CSI-RS resource set, the second subset of the NZP CSI-RS resource set comprising one or more NZP CSI-RS ports, the measurement of interference performed according to assumptions comprising that: each
Petition 870190034020, of 09/09/2019, p. 217/246
19. UE according to any one of claims 13 to 18, characterized by the fact that the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources overlap.
[20]
20/21 NZP CSI-RS port in the second subset of the NZP CSI-RS resource set corresponds to an interference transmission layer, the interference measurement being according to a set of energy ratios per resource element (EPRE), each associated with an NZP CSI-RS resource in the second subset of the NZP CSI-RS resource set, and another interference not associated with an interference transmission layer to which an NZP CSI-RS port in the second subset of the NZP resource set CSI-RS corresponds to the first subset of the NZP CSI-RS resource set and the second subset of the NZP CSI-RS resource set;
device to generate the CSI report based on channel measurement and interference measurement; and device for transmitting the CSI report to a network.
71. Wireless communication device, characterized by the fact that it comprises:
device for indicating, for a user equipment (UE), a set of non-zero power (NZP) channel status information (CSI) reference signal (CSI) (NZP CSI-RS) for measurement of channel and interference measurement, a first subset of the NZP CSI-RS feature set being configured for channel measurement and a second subset of the NZP CSI-RS feature set being configured for interference measurement; and device for receiving a CSI report from the UE, the CSI report being based on channel measurement and interference measurement, the channel measurement having been performed by the
Petition 870190034020, of 09/09/2019, p. 218/246
20. UE according to any one of claims 13 to 19, characterized in that the programming additionally includes instructions for receiving, by the UE, from a network node, an indication of the NZP CSI-RS resource set for measurement channel and interference measurement, the indication indicating the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources.
21. UE, according to claim 20, characterized by the fact that the network node comprises a NodeB, an evolved NodeB (eNB) or a next generation NodeB (gNB).
22. UE, according to claim 20 or 21, characterized by the fact that the UE receives from the network node the indication of the first subset of NZP CSI-RS resources and of the second subset of NZP CSI-RS resources through information downlink control (DCI).
23. UE, according to claim 20 or 21, characterized by the fact that the UE receives from the network node the indication of the first subset of NZP CSI-RS resources and the second subset of NZP CSI-RS resources by means of a combination of downlink control (DCI) information and media access control (MAC) signaling.
Petition 870190034020, of 09/09/2019, p. 204/246
[21]
21/21
UE in the first subset of the NZP CSIRS resource set and the interference measurement having been performed by the UE in the second subset of the NZP CSI-RS resource set and according to assumptions comprising that: each NZP CSI-RS port in the second subset of the set NZP CSI-RS resource corresponds to an interference transmission layer, the interference measurement being according to a set of energy ratios per resource element (EPRE), each associated with an NZP CSI-RS resource in the second subset NZP CSI-RS feature set, and other interference not associated with an interference transmission layer that an NZP CSI-RS port in the second subset of the NZP CSI-RS feature set corresponds to is in the first subset of the NZP feature set CSI-RS and the second subset of the NZP CSI-RS feature set.

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法律状态:
2021-10-19| B350| Update of information on the portal [chapter 15.35 patent gazette]|

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