methods and apparatus for notifying a eu of preemption

专利摘要:
aspects of the disclosure concern systems and methods for multiplexing low-latency and latency-tolerant communications. when latency-tolerant traffic preempts low-latency traffic in a first interval, low latency traffic acquired by preemption can be transmitted in a subsequent interval. there are multiple projects revealed to notify eu that are affected by preemption events. the various projects include implicit or explicit notification that can be semi-static or dynamic. examples of notification include notification that a preemption event occurs, notification of the location of the preemption event, notification of whether a supplementary transmission will occur, and notification of the location of the supplementary transmission.
公开号:BR112019019401A2
申请号:R112019019401
申请日:2018-03-16
公开日:2020-05-05
发明作者:Zhang Jiayin；Islam Toufiqul
申请人:Huawei Tech Co Ltd；
IPC主号:

专利说明:

METHODS AND APPARATUS FOR NOTIFYING A PREEMPTION UE
TECHNICAL FIELD [001] The present invention in general concerns a system and method for wireless communications, and, in particular modalities, a system and method for multiplexing low latency and latency-tolerant communications.
BACKGROUND [002] In some wireless communication systems, an electronic device (ED) such as user equipment (UE) communicates wirelessly with one or more base stations (BS). Wireless communication from an ED to a BS is referred to as an uplink communication. Wireless communication from a BS to an ED is referred to as a downlink communication. Resources are required to perform uplink and downlink communications. For example, a BS or a group of BSs can wirelessly transmit data to an ED in a downlink communication at a particular frequency for a particular duration of time. The frequency and duration of time are examples of resources.
[003] A BS allocates resources for downlink communications for the EDs served by the BS. Wireless communications can be performed by transmitting orthogonal frequency division (OFDM) multiplexing symbols.
[004] Some EDs served by a BS, or by a group of BSs, may need to receive data from the BS with less latency than that of other EDs served by the BS. For example, a BS can serve multiple EDs, including a first ED and a second ED. The first ED can be a mobile device
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2/91 uploaded by a user who is using the first ED to browse the Internet. The second ED can be equipment in an autonomous vehicle traveling on a highway. Although BS is serving both EDs, the second ED may need to receive data with less latency when compared to that of the first ED. The second ED may also need to receive its data with greater reliability than the first ED. The second ED can be an ultra-reliable low-latency communication ED (URLLC), while the first ED can be an enhanced mobile broadband ED (eMBB). It is desired to provide an acceptable level of service for different types of devices while efficiently using available communication bandwidth.
[005] EDs that are served by a BS and that require lower latency downlink communication will be referred to as low latency EDs or low latency UEs. The other EDs served by BS will be referred to as latency-tolerant EDs or latency-tolerant UEs. Data to be transmitted by BS to a low-latency ED will be referred to as low-latency data, and data to be transmitted by BS to a latency-tolerant ED will be referred to as latency-tolerant data.
SUMMARY [006] Technical advantages in general are achieved by aspects of this disclosure that describe a system and method for multiplexing traffic.
[007] In accordance with one aspect of the present disclosure, a method is provided to notify a UE of preemption of a portion of traffic in a first interval, the method
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3/91 comprising: shuffling at least part of an indication of the preemption of the traffic portion in the first interval using a temporary radio network identifier (RNTI); and transmitting the indication, including the scrambled part, to the UE in a downlink control information (DCI) message on a downlink control physical channel (PDCCH).
[008] Optionally, in any of the previous aspects, the indication additionally includes an identification of a location of the part of traffic that was acquired by preemption in the first interval.
[009] Optionally, in any of the previous aspects, the method additionally comprises transmitting the RNTI to the UE which is used to shuffle at least part of the indication.
[010] Optionally, in any of the previous aspects, the method additionally comprises transmitting an indication of granularity of a time-frequency resource.
[011] Optionally, in any of the previous aspects, transmitting a granularity indication of a time-frequency resource comprises transmitting the granularity indication through higher layer signaling.
[012] Optionally, in any of the previous aspects, transmitting the indication comprises transmitting the indication in the first interval.
[013] Optionally, in any of the previous aspects, transmitting the indication comprises transmitting the
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4/91 indication in a second interval subsequent to the first interval.
[014] Optionally, in any of the previous aspects, transmitting the indication comprises transmitting an indication that no transmission to the UE is present in a time-frequency resource corresponding to the portion of traffic indicated to be acquired by preemption in the first interval.
[015] Optionally, in any of the previous aspects, the time-frequency resource is one or more of: at least one symbol; and at least one resource block.
[016] Optionally, in any of the previous aspects, transmitting the indication comprises transmitting the indication in a common group control region.
[017] Optionally, in any of the previous aspects, when a carrier has more than one part of active bandwidth, transmit an indication for each part of active bandwidth.
[018] Optionally, in any of the previous aspects, a size of a transmission resource used to transmit the indications for each part of active bandwidth contains xy bits, where x defines a number of elements in the time domain distinct from one particular granularity and y defines a number of resources in the time domain distinct from a particular granularity in the first scaling interval.
[019] In accordance with another aspect of the present disclosure, a method is provided to notify a UE of preemption of a portion of traffic in a first interval, the method comprising: receiving on a physical channel of
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5/91 downlink control (PDCCH) a downlink control (DCI) message containing an indication, in which at least one part is scrambled, that the traffic part was acquired by preemption in the first interval; use a temporary radio network identifier (RNTI) to decode the scrambled part of the indication that the traffic part was acquired by preemption in the first interval.
[020] Optionally, in any of the previous aspects, the indication additionally includes an identification of a location of the part of traffic that was acquired by preemption in the first interval.
[021] Optionally, in any of the previous aspects, the method additionally comprises receiving an identification of the RNTI to be used to unscramble the scrambled part of the indication.
[022] Optionally, in any of the previous aspects, the method additionally comprises receiving an indication of granularity from a temp-frequency resource.
[023] Optionally, in any of the previous aspects, receiving an indication of granularity from a time-frequency resource comprises receiving the indication of granularity through higher layer signaling.
[024] Optionally, in any of the previous aspects, receiving the indication comprises receiving the indication in a second interval subsequent to the first interval.
[025] Optionally, in any of the previous aspects, receiving the indication comprises receiving a
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6/91 indication that transmission is not present in a time-frequency resource corresponding to the portion of traffic indicated to be acquired by preemption in the first interval.
[026] Optionally, in any of the previous aspects, the method additionally comprises the time-frequency resource defined as one or more of: at least one symbol; and at least one resource block.
[027] Optionally, in any of the previous aspects, receiving the indication comprises receiving the indication in a common group control region.
[028] Optionally, in any of the previous aspects, when the UE has more than one part of active bandwidth in a system bandwidth, receive an indication for each part of active bandwidth.
[029] In accordance with an additional aspect of the present disclosure, an apparatus is provided comprising at least one antenna, a processor and a computer-readable medium. Computer-readable media stores executable instructions per processor that, when executed by the processor, induce the device to: scramble at least part of a preemption indication of the traffic portion in the first interval using a temporary radio network identifier (RNTI) ; and transmitting the indication, including the scrambled part, to the UE in a downlink control information (DCI) message on a downlink control physical channel (PDCCH).
[030] In accordance also with another aspect of the present disclosure, an apparatus is provided comprising at least
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7/91 an antenna, processor and computer-readable media. Computer-readable media stores executable instructions per processor that, when executed by the processor, induce the device to: receive on a physical downlink control (PDCCH) channel a downlink control (DCI) message containing an indication, in the which at least a part is scrambled, that the traffic part was acquired by preemption in the first interval; use a temporary radio network identifier (RNTI) to decode the scrambled part of the indication that the traffic part was acquired by preemption in the first interval.
BRIEF DESCRIPTION OF THE DRAWINGS [031] For a more complete understanding of the present invention, and its advantages, reference is now made to the description below considered together with the accompanying drawings, in which:
[032] Figure 1 illustrates a network for transmitting data.
Figure 2 is an example of a frame structure provided by an embodiment of the invention.
Figure 3 illustrates a modality of minislot architecture.
Figure 4A illustrates an explicit later indication of minislots traffic modality.
Figure 4B illustrates an indication of low latency traffic mode.
Figure 5 illustrates modalities for configuring and signaling minislots.
Figure 6 illustrates an example of information being acquired by preemption in a first interval and
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8/91 retransmitted at a subsequent interval according to an aspect of the disclosure.
Figure 7 illustrates an example of two scheduling intervals, each having a control region that can be used to transmit an indication of a preemption event according to an aspect of the disclosure.
Figure 8 illustrates an example of preemption of a part of a transmission resource in a first interval and the information acquired by preemption being scheduled for retransmission in a subsequent interval according to an aspect of the disclosure.
Figure 9 illustrates another example of preemption of a part of a transmission resource in a first interval and the information acquired by preemption being scheduled for retransmission in a subsequent interval according to an aspect of the disclosure.
Figure 10 also illustrates another example of preemption of a part of a transmission resource in a first interval and the information acquired by preemption being scheduled for retransmission in a subsequent interval according to an aspect of the disclosure.
Figure 11 illustrates an additional example of preemption of a part of a transmission resource in a first interval and the information acquired by preemption being scheduled for retransmission in a subsequent interval according to an aspect of the disclosure.
Figure 12 illustrates an example of preemption of a part of a transmission resource in a first interval and an indication of the event acquired by preemption being sent in the same interval according to an aspect of the disclosure.
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9/91
Figure 13 illustrates an example of multiple preemption events occurring within a transmission bandwidth divided into a Frequency Division Multiplexing (FDM) mode according to an aspect of the disclosure.
Figure 14 illustrates an example of a single preemption event occurring within a transmission bandwidth divided into a Frequency Division Multiplexing (FDM) mode according to an aspect of the disclosure.
Figure 15 illustrates another example of multiple preemption events occurring within a transmission bandwidth divided into a Frequency Division Multiplexing (FDM) mode according to an aspect of the disclosure.
Figure 16 illustrates an example of multiple cell preemption in accordance with an aspect of the present application.
Figures 17A - 17D illustrate methods according to aspects of the present application.
Figure 18 illustrates a diagram of a modality processing system.
Figure 19 illustrates a diagram of a modality transceiver.
Figure 20 illustrates an example of common group indication signaling in a latency-tolerant escalation interval according to an aspect of the present application.
Figure 21 illustrates another example of common group indication signs according to an aspect of the present application.
[033] Numbers and corresponding symbols in the different Figures generally refer to the parts
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10/91 corresponding unless otherwise indicated. The Figures are designed to clearly illustrate the relevant aspects of the modalities and are not necessarily drawn to scale.
DETAILED DESCRIPTION OF ILLUSTRATIVE MODALITIES [034] The structure, manufacture and use of currently preferred modalities are discussed in detail below. It should be noted, however, that the present invention provides many applicable inventive aspects that can be incorporated in a wide variety of specific contexts. The specific modalities discussed are merely illustrative of specific ways to build and use the invention, and do not limit the scope of the invention.
[035] Generally speaking, modalities of the present disclosure provide a method and system for the coexistence of services mixed in a flexible time frame framework. For simplicity and clarity of illustration, reference numbers can be repeated in the Figures to indicate corresponding or similar elements. Numerous details are exposed to provide an understanding of the examples described in this document. Examples can be practiced without these details. In other instances, well-known methods, procedures and components are not described in detail to avoid obscuring the examples described. The description is not to be considered as limited to the scope of the examples described in this document.
[036] For the purpose of this description, a first traffic type user equipment (FTTUE) is a UE that is configured to transmit and receive traffic from a
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11/91 first type, for example, latency-tolerant traffic such as eMBB traffic. A second traffic type UE (STTUE) is a UE that is configured to transmit and receive traffic of a second type, for example, low latency traffic such as URLLC traffic. However, a given STTUE may also have other capabilities including, but not limited to, handling traffic of the first type of traffic and receiving at least two types of traffic. In some modalities, traffic of the first type is relatively tolerant to latency when compared to traffic of the second type. In a specific example, traffic of the first type is eMBB traffic, and traffic of the second type is URLLC traffic, eMBB traffic being relatively tolerant to latency when compared to URLLC traffic.
[037] It should be understood that references to URLLC and eMBB in this disclosure are only examples of low-latency traffic and latency-tolerant traffic, and that the methods described in this document are equally applicable for any two types of traffic having different latency requirements. . Some examples include low-latency traffic not requiring high reliability, and latency-tolerant traffic with less stringent reliability requirements. Some use cases also include massive machine-type communication (mMTC) and / or narrowband Internet of Things (loT). The multiplexing schemes discussed in the invention can also refer to the examples mentioned above, where applicable.
[038] Referring to Figure 1, a schematic diagram of a network 100 is shown. BS 102 provides uplink and downlink communication with network 100
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12/91 for a plurality of UEs 104-118 within a coverage area 120 of BS 102.
[039] As used in this document, the term BS refers to any component (or set of components) configured to provide wireless access to a network, such as an evolved NodeB (eNB), gNodeB (gNB), a macrocell, a femtocell, a Wi-Fi access point (AP) or other wirelessly enabled devices. The terms eNB and BS are used interchangeably throughout this disclosure. BSs can provide wireless access according to one or more wireless communication protocols; for example, long-term evolution (LTE), advanced LTE (LTE-A), High Speed Packet Access (HSPA), 802.1la / b / g / n / ac Wi-Fi, etc. As used in this document, the term UE refers to any component (or set of components) capable of establishing a wireless connection with a BS, such as a mobile station (STA) or other wirelessly enabled devices. In some embodiments, network 100 may comprise several other wireless devices, such as relays, low-power nodes, etc.
[040] In a specific example, UEs 104-110 are STTUEs, and UEs 112-118 are FTTUEs. In a more specific example, UEs 104-110 employ orthogonal frequency division multiplexing (OFDM) to transmit URLLC traffic. It is considered that OFDM can be used in combination with a non-orthogonal multiple access scheme such as Sparse Code Multiple Access (SOMA). UEs 112-118, for example, can transmit eMBB traffic. 112-118 UEs can also use OFDM. BS 102 can be, for example, an access point. The functions described in BS 102
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13/91 can also be performed by multiple BSs using synchronous downlink transmission. Figure 1 shows a BS 102 and eight UEs 104-118 for illustrative purposes, however there may be more than one BS 102 and the coverage area 120 of BS 102 may include more or less than the eight UEs 104-118 in communication with to BS 102.
[041] The network and UEs in Figure 1 can communicate with each other using time division duplex (TDD) or frequency division duplex (FDD) frame structures. Each subframe has a downlink segment, an uplink segment and a guard period separating the downlink segment from the uplink segment. Referring to Figure 2, a specific example of a time division duplexing frame structure 202 is shown. Frame structure 202 is composed of the four subframes 204, 206, 208, 210. In some embodiments, subframes can be dominant downlink, meaning that more resources are allocated for downlink traffic when compared to uplink traffic, or dominant uplink traffic.
[042] In some modalities, time division duplex communications are transmitted in two or more sub-bands, each operating with a different subcarrier spacing. In the example of Figure 2 the two subbands 220, 222 are shown operating with different subcarrier spacing. Specifically, subband 220 operates with a subcarrier spacing of 60 kHz, and subband 222 operates with a subcarrier spacing of 30 kHz. Any two are considered
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14/91 suitable subcarrier spacing can be used. For example, two numerologies with different subcarrier spacing can be chosen from a set of scalable numerologies having subcarrier spacing that differ by a factor of 2m, where m is an integer. Some other examples of scalable numerologies include 15 kHz and 30 kHz subcarrier spacing; and 15 kHz and 60 kHz subcarrier spacing.
[043] The TDD nature of each subframe is generally indicated at 211 which shows a self-contained subframe structure including downlink segment 212, guard period 214 and uplink segment 216. For this example, OFDM symbols for data transmitted in the 60 kHz band have a length of time that is half that of OFDM symbols for data in the 30 kHz band. The subframe contents in the 60 kHz subband are indicated at 220 and include the 10 downlink OFDM symbols 230, 232, 234 and 236, followed by a guard period that includes two OFDM 238 symbol durations, and two symbols uplink 240. The subframe contents in the 30 kHz subband are indicated at 222 and include 5 OFDM symbols 242, 244, followed by a guard period that includes an OFDM symbol duration 246, and then a link symbol ascending 248. It must be understood that this project is implementation specific. However, importantly, the TDD structure of the content in the two sub-bands is aligned in the sense that the uplink transmissions in a sub-band (for example, the 60 kHz sub-band) are aligned with link transmissions. ascending in another sub-band (for example, the sub-band
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15/91 30 kHz), and a similar alignment is present for downlink transmissions and the guard period. One or more symbols, in this example the symbols 230 and 234, have a cyclic prefix greater than that of the remaining symbols 232 of their sub-bands. Similarly, the symbol 242 has a cyclic prefix greater than that of the remaining symbols 244 in its subband. The lengths of different cyclic prefixes can be used to ensure the desired alignment of the guard period and the uplink and downlink transmissions.
[044] In the example in Figure 2, the total frame structure 202 is 1 ms in duration, and subframes 204, 206, 208, 210 are 0.25 ms in duration. In the 60 kHz band, each 0.25 ms subframe is further divided into two halves, each 0.125 ms. Frame structure 220 for the 60 kHz band includes symbols 230, 232 in the first half and includes symbols 234, 236, 238, 240 in the second half.
[045] In some implementations, for each time division duplexing frame or subframe, scheduling information in relation to downlink traffic of the first type can be sent based on a predefined scheduling interval that can be equal to the duration of a time division duplexing frame. In other implementations, an escalation interval length for the first type of traffic can be varied dynamically. For example, the escalation interval can be a slot for a first period of time and an aggregation of time intervals for a second period of time. In addition, in the case of central DL TDD, this may not be the case where the first type of traffic is staggered
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16/91 using all DL symbols available in a TDD subframe. In addition, for each subframe, scheduling information is transmitted in relation to downlink traffic of the second type based on a scheduling interval equal to the duration of a subframe. For the example in Figure 2, the scheduling information for traffic of the first type is sent at the beginning of the time division duplex scheduling interval, and is based on a scaling interval of 0.5 ms or less, corresponding the duration of the downlink part of the frame structure. The scheduling information for traffic of the second type is sent at the beginning of each subframe, and is based on a scheduling interval of 0.25 ms. The scheduling information indicates resources that are allocated for traffic of the first type or traffic of the second type in the respective scheduling interval. In Figure 2, it should be understood that traffic of the first type can be transmitted in resources allocated primarily to traffic of the second type, or vice versa, according to the methods discussed below.
[046] It should be understood that, although modalities are described in this document in reference for preemption of latency-tolerant downlink transmissions, they are also applicable for the preemption of latency-tolerant uplink transmissions. In particular, a latency-tolerant UE can receive downlink signaling on a group common PDSCH or PDCCH, or UE specific PDCCH or according to any of the signaling modalities described below, indicating the presence of a link transmission bearish rising
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17/91 latency. The latency-tolerant UE may be responsive to this downlink signaling to preemptively acquire or postpone its uplink transmission on resources that will contain low latency uplink transmission, as indicated by the downlink signaling. This may be particularly applicable when low latency uplink transmissions are concession based, or when low latency uplink transmissions are otherwise predictable, for example, retransmissions from previous concession free transmissions. In one example, common group PDCCH containing preemption information of DL and UL can be distinguished by means of RNTI of specific indication of DL and UL.
[047] In some modalities, some time after the first subframe, information is transmitted that updates the scheduling information in relation to downlink traffic of the first type in a subframe other than the first subframe. In some implementations, the information that updates the scheduling information may include an indication of a preemption of traffic of the first type. In some implementations, the information that updates the scheduling information may include information to dynamically configure the scheduling interval length or other scheduling parameters that a UE may need to know to receive and decode transmitted traffic.
[048] When BS 110 has data to transmit to UEs, BS 110 transmits this data in one or more downlink transmissions using allocated resources,
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18/91 for example, time / frequency resources. Specific resource partitions can be designated for transmissions to the UEs. A portion of the time / frequency resources may be reserved for low latency downlink transmission, and this portion may be referred to as the low latency resources. Some other part of the time / frequency resources can be reserved for downlink transmission of latency-tolerant data, and this part can be referred to as latency-tolerant resources. The share of reserved resources such as low latency resources can change dynamically or semi-statically over time, for example, based on factors such as traffic load, bandwidth requirements and latency.
[049] In one embodiment, both low-latency and latency-tolerant data are transmitted over a shared time-frequency resource anywhere within the transmission bandwidth. The two types of traffic can coexist without a pre-allocated bandwidth partition. For example, low-latency and latency-tolerant data can occupy resources in a time domain multiplexing (TDM) mode, either using a scaling method or by preemption.
[050] Low latency data can be intermittent or sporadic in nature, and can be transmitted in small packets. It may not be efficient to dedicate resources to low-latency data. Therefore, a coexistence region can be defined in which a resource designation for latency-tolerant traffic overlaps with a resource designation for low traffic
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19/91 latency in time and frequency domains. Latency-tolerant UEs can monitor the presence of low-latency traffic during transmission if they are staggered in the coexistence region. In another example, a specific coexistence region is not reserved. Coexistence can happen dynamically within shared time-frequency resources within a carrier BW. In addition, it is also possible that coexistence resources can extend across multiple carrier BWs. Referring to Figure 2, subband 220 can be a coexistence region and subband 222 can be a latency tolerant region.
[051] Existing technologies can use downlink link (DL) multiplexing based on indication. Possible signaling solutions for implicit and explicit indication of low-latency traffic arrival during ongoing transmission of latency-tolerant traffic may be desirable. Proposed solutions can use latency-tolerant traffic code block interleaving, and latency-tolerant transport block (TB) mapping can also be updated for a better coexistence experience.
[052] Low-latency resources can be partitioned into transmission time units (TTUs). In some implementations, variable-length TTUs are supported to scale low-latency traffic. In other implementations, there may be one or only a few basic TTU lengths supported. Longer lengths can be achieved by aggregating multiple TTUs. A TTU of low latency resources can be referred to
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20/91 as a low latency TTU. A TTU can be a unit of time that can be allocated for a particular type of transmission, for example, a low-latency data transmission. The transmission can be staggered or unscheduled. In some embodiments, a TTU is the smallest unit of time that can be allocated for a transmission of a particular type. Also, a TTU, or several TTUs, is sometimes referred to as a transmission time interval (TTI). A low latency TTU, the length of a minislot, can include any number of symbols that is less than the number of symbols in a latency-tolerant TB slot. More generally, a TTU designated for transmitting low-latency traffic can comprise one or more symbols where the number of symbols can be less than a slot. A slot can comprise an integer number of symbols such as 7, 14, 21, 28 symbols. It is also possible that an aggregation of minislots for a single low-latency transmission could result in a transmission that lasts longer than a slot. As a result, in some cases a low-latency transmission may have a duration that is longer than a slot, such as when a transmission from a low-latency TB comprises grouping of multiple TTUs which can be beneficial for cell-edge UEs.
[053] Latency-tolerant resources can be partitioned into scaling intervals, and a latency-tolerant resource scaling interval can be referred to as a latency-tolerant UE scaling interval. A latency-tolerant UE escalation interval is the smallest time interval that can be scaled for a data transmission to a tolerant UE
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21/91 the latency. A latency-tolerant escalation interval can also be referred to as a latency-tolerant TTU. A latency-tolerant TTU can span one or multiple slots in a numerology, or it can be an aggregation of one or more slots with one or more minislots. For example, a latency-tolerant TTU can be 1 ms consisting of 14 symbols based on 15 kHz subcarrier spacing. If a slot is defined as 7 symbols, then in this example, a latency-tolerant TTU or scaling interval covers two slots. In these examples, a slot is assumed to contain 14 or 7 symbols. A low-latency TTU can have a duration that is less than a latency-tolerant UE escalation interval. By transmitting TBs of a shorter duration on low-latency resources, the latency of data transmissions to low-latency UEs can be reduced.
[054] In some modalities, low latency resources have a numerology that is different from the numerology of latency-tolerant resources; for example, the subcarrier spacing of low latency resources is different from the subcarrier spacing of latency-tolerant resources. Low-latency resources can have a subcarrier spacing that is greater than the subcarrier spacing of latency-tolerant resources. For example, the subcarrier spacing of low-latency resources can be 60 kHz, and the subcarrier spacing of latency-tolerant resources can be 15 kHz. When using larger subcarrier spacing, the duration of each OFDM symbol on low latency resources may be less than the duration of
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22/91 each OFDM symbol on latency-tolerant resources. Latency-tolerant TTUs and low-latency TTUs can include the same number of symbols, or different numbers of symbols. Symbols in latency-tolerant TTUs and low-latency TTUs can have the same numerology, or different numerologies. If a TTU is defined as having a fixed number of numerology-independent OFDM symbols, then more than one low-latency TTU can be transmitted during a latency-tolerant UE escalation interval. For example, the latency-tolerant UE escalation interval can be an integer multiple of the low-latency TTU. In another embodiment, a latency-tolerant UE escalation interval is not an integer multiple of the low-latency TTU. For example, when the latency tolerant UE scaling interval is 7 symbols and the low latency TTU is 2 symbols. The symbol length in latency-tolerant TTUs and / or in low-latency TTU can be varied by changing the length of a cyclic prefix in the latency-tolerant TTUs and / or in the low-latency TTU. In other modalities, low-latency resources and latency-tolerant resources have the same numerology. A low-latency TTU can then be set to have fewer OFDM symbols when compared to the number of OFDM symbols in a latency-tolerant UE escalation range, such that there will still be more than one low-latency TTU within a range of latency tolerant UE scaling. For example, the duration of a low-latency TTU can be as short as a single OFDM symbol. It is also considered that low transmission
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23/91 latency and latency-tolerant transmission may not have the same number of symbols per TTU, whether or not they have the same numerology. If different numerology is used, the symbols of a low-latency TTU with larger subcarrier spacing can line up to the limit of the one or multiple symbols of the latency-tolerant TTU with a smaller subcarrier spacing.
[055] A TTU can be divided into a number of slots, for example, 2 slots. A low-latency slot life can be equal to or less than a latency-tolerant slot or a long-term evolution (LTE) slot. A minislot can contain any number of symbols that is less than the number of symbols in a slot; for example, 1, 2, 3, 4, 5, 6 symbols if a slot is 7 symbols.
[056] Figure 3 illustrates a modality minislot architecture that can be used in an interval. In this example, a minislot comprises two symbols. The range can consist of multiple minislots. A low latency interval can include physical control format indicator channel (PCFICH) and / or hybrid automatic repeat request indicator (HARQ) physical channel (PHICH). Alternatively, PCFICH and / or PHICH indicators can be excluded from a low latency interval. Control information for a low-latency TB can be limited to the first symbol. Control information for a low-latency TB can be divided into two parts. The first part contains control information necessary for receiving and demodulating data. The second part contains other pieces of control information that are not necessary for demodulation of data in the current low latency TTU, for example
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24/91 example, PUCCH power control. Resource elements (REs) containing control information for low-latency traffic may or may not be contiguous. The same cell-specific RS (CRS) or demodulation reference signal (DMRS) can be used for low-latency control information and data. Because the time domain granularity is short, multiple resource blocks can be grouped together for minimal resource granularity when a minislot is scaled. Resource allocation granularity based on resource block group (RBG) can be based on compact downlink link information (DCI) or on 1 RBG with minimal granularity.
[057] DMRS can be loaded in front of one or more symbols at the beginning of the minislot or distributed over the duration of the minislot. In some implementations, increasing the level of aggregation of control channel elements (CCE) in a physical downlink control channel (PDCCH) is supported. Reducing the number of UEs scaled by minislot can increase reliability. Each minislot can contain its own DMRS. However, if an aggregation of minislots is scaled together, the network may choose not to include DMRS in some of the minislots that are part of an aggregation. If the transmission is based on an aggregation of minislots, the UE can know implicitly, based on an aggregation level, whether or not DMRS is included in each of the minislots. The level of aggregation can be indicated in the EU specific DCI or in group common DCI. For example, if two minislots are aggregated, the UE may not expect DMRS in the second minislot, and use of the DMRS loaded in front of the first minislot may be sufficient. In another
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25/91 modality, the UE can be pre-configured to receive DMRS in some or all of the minislots that are aggregated or the UE can be notified by means of semi-static signaling, such as RRC signaling, if the UE is to receive DMRS in all or some of the minislots that are aggregated.
[058] Indication of the presence of low-latency traffic can be signaled dynamically by means of the resources normally reserved for control signaling for latency-tolerant traffic or for low-latency traffic, or when transmitting additional control signaling within the resources of another would be allocated to data within the latency tolerance range. For example, a single control message can be used to indicate the presence of low-latency traffic, at one or more symbols at or near the end of a latency-tolerant escalation interval in the frequency-frequency resources where transmission of traffic from low latency by preemption of latency-tolerant traffic is supported. Control signaling can also, or alternatively, be sent in time, or immediately before it, in which low-latency traffic is scheduled for transmission. The control signaling can be UE specific or cell specific (i.e., a single control signal broadcast for all UEs) or group specific (i.e., a multicast control signal for each group of UEs).
[059] Signaling of an indication of the presence of low-latency traffic can be explicit or implicit. For explicit indication, some REs (for example, contained within a symbol or spanning multiple contiguous or non-contiguous symbols) can be used to signal
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26/91 the indication. In one embodiment, one or more REs originally scheduled for latent-tolerant traffic, but where low-latency transmission actually occurs, can be used to signal the indication. Scaling of low latency TTU can avoid the use of REs containing the indication of preemption; for example, low-latency traffic can be matched in fee to remaining REs within the low-latency TTU. In another modality, REs that contain indication signaling do not overlap with the features of low latency minislots. For example, REs containing indication signals may correspond to different time-frequency resources than the time-frequency resources contained in the low-latency TTU symbols. REs may contain a common group indication, that is, the REs used to send the indication may be outside the staggered RBs for transmission of a latency-tolerant transmission block. Signals indicating the presence of low-latency traffic can be sent on resources that do not overlap with latency-tolerant pilot signals. Alternatively, signaling indicating the presence of low-latency traffic can be sent on one or more symbols containing latency-tolerant pilot signals, but not on REs containing latency-tolerant pilot signals. Yet another alternative, low-latency TTUs can be scaled into REs containing latency-tolerant pilot signals. When the low-latency transmission is sent on a time-frequency resource that includes latency-tolerant pilot signals, low-latency data transmission or pilot signals, and the latency-tolerant pilot signals can be orthogonal to each other. In some
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In 27/91 cases, it is possible for low-latency pilot signals and latency-tolerant TTUs to be sent on the same or overlapping resources. Orthogonality of pilot signals is maintained in the code domain or in the space domain.
[060] Alternatively, one or more latency-tolerant symbol REs near the end of a latency-tolerant / TTU can be used to notify UEs about low-latency traffic that has latency-tolerant traffic acquired by preemption during the interval total. Any latency-tolerant traffic in the interval that was acquired by preemption in favor of low-latency traffic can be transmitted in a subsequent interval. In some embodiments, REs that are used to notify UEs about low-latency traffic that has preemption-acquired latency-tolerant traffic can be reserved and not included as part of the latency-tolerant broadcast scheduling process.
[061] For implicit indication, existing eMBB control, URLLC control, DMRS and / or other signaling can be used to indicate the presence of URLLC traffic. Low-latency TTU features or latency-tolerant features (for example, eMBB pilot signals) can be used. For example, eMBB UEs can blindly detect at least low latency TTU control part or DMRS, or both. If eMBB traffic is staggered in multiple aggregated slots, then in each DMRS slot it can signal whether or not that slot contains a low-latency transmission. For example, in each TTU / slot of a latency-tolerant transmission, a DMRS sequence is chosen by
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28/91 base station based on whether low latency traffic is present or not. The latency-tolerant receiver blindly detects which sequence is sent. In another example, a standard other than DMRS can be sent if low latency traffic arrives. A set of strings or DMRS standards, or both, is configured through higher layer signaling. Latency-tolerant UEs can be notified via RRC signaling if the UE needs to blindly detect DMRS from a configured DMRS group. One DMRS detected may indicate preemption, another one may not indicate preemption.
[062] The indication can be dynamically signaled to one or more eMBB UEs whose designated downlink resources have been acquired by preemption at least partially by another downlink transmission. This indication may increase the likelihood of successful demodulation and decoding of the TB (s) transmitted on the designated resource based on the transmission acquired by preemption and / or subsequent transmissions or retransmissions of the same TB. The indication notifies eMBB UEs that a portion of eMBB traffic has been acquired by preemption and that further transmission can be expected. The use of the indication allows the UEs to receive the supplemental transmission to combine an initial perforated transmission and the supplementary transmission for a greater chance of successfully decoding traffic.
[063] Figure 4A illustrates a modality for later explicit indication of preemption of traffic based on slots by means of minislots traffic. Bandwidth (BW) is
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29/91 comprised of the three sub-bands 510, 512, 514. Each sub-band is a Resource Block (RB) including 12 sub-carriers. In this example, a duration of minislot 502 is preconfigured and / or static; a minislot start location within the slot is pre-configured or can be any symbol. An indicator string 506 can identify time and frequency resources that are acquired by preemption because of transmission based on minislots. For example, if a latency-tolerant transport block covers the bandwidth of a number x of RBs, RBGs, sub-bands or some other unit predetermined in frequency and a duration of a number y of minislots or groups of symbols in the time, then later indication can contain an xy number of bits to identify which time-frequency areas are acquired by preemption. If overload is a concern, only preemption information in the time and / or frequency domain can be carried. According to the example presented above, each later indication can contain only x bits if only preemption information in the time domain is provided. According to the example set out above, each later indication can contain only y bits if only preemption information in the frequency domain is provided. In another example, several time-frequency resources can be grouped and indication of group-based preemption can be provided, which may require a smaller number of bits when compared to the case where information of all the granularities of time-resources frequency within a latency-tolerant transport block is carried. A time-frequency resource group can have a width
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30/91 bandwidth equivalent to that of a group of resource blocks or a partition of the total frequency transmission bandwidth and a group of symbols over time, where the group of symbols may or may not be the same number of symbols on a low latency TTU.
[064] Figure 4B illustrates a latency-tolerant code block (CB) mapping mode. In this example, the minimum granularity in the frequency domain available to scale low latency and latency-tolerant traffic is the same. This allows low-latency traffic to be scaled within the limit of a single latency-tolerant TB, which can reduce signaling overhead by ensuring that minimal granularity in the low-latency transmission frequency domain affects only a single latency-tolerant TB. .
[065] Figure 4B illustrates an indication of low latency traffic mode. This example is also an example of a later indication. The preemption indication can be used to indicate the number of CBs drilled. In this example, eMBB CBs are drilled. This may be more suitable for a scheme in which the drilled eMBB CBs are transmitted later. Additional levels of quantization may also be possible, for example CB 25% perforated, 50% perforated, etc. The display field can additionally contain information regarding the level of drilling. A single-bit indication can be used to indicate the presence or absence of URLLC, or the presence or absence of a threshold quantity of URLLC, for the full latency-tolerant transmission block or in an individual part of the latency-tolerant transmission block . THE
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31/91 signaling can be transmitted upon the arrival of low-latency traffic for transmission, during the time-frequency resources that are used for transmission of low-latency traffic, at the end of the affected latency-tolerant TB, or at any other appropriate time . As previously described, signaling can be a single broadcast signal for all UEs, one or more multicast signals for one or more groups of UEs, or one or more specific UE signals for one or more individual UEs.
[066] Figure 5 shows an example of using an indicator to notify the UE of eMBB if there is a URLLC service in a period of time or in a certain frequency band. If there is no URLLC service in a period of time or in a certain frequency band, then in this region of tempofrequency the UE of eMBB would not need to monitor low latency control signaling or consider possible drilling during its decoding process. If there was a URLLC service, the eMBB UE would function in a coexistence (or ready-made) mode, which may involve being able to decode a received TB that has been pierced. This indication can be explicit, for example, using higher layer signaling (Radio Resource Control, RRC) or dynamic physical layer signaling. It can also be implied, for example, using different DMRS standards. A first DMRS pattern indicates that URLLC traffic is not expected, and a second DMRS pattern indicates the possibility of URLLC traffic, so handling of perforated eMBB information may be necessary. This can also be done through subband splitting. One subband is only eMBB, the other subband is eMBB +
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32/91
URLLC. The benefit of this indication is to avoid an overhead of processing the eMBB UE if there is no URLLC traffic in a period of time or in a certain frequency band. Based on the first stage signaling, semi-static or dynamic, the eMBB UE (s) will decide whether or not to monitor the preemption indication.
[067] Latency-tolerant traffic, such as eMBB data, which is impacted by preemption events can be retransmitted on a staggered basis. A first option for scheduling overhead transmission may be to schedule overhead automatic transmission before the UE attempts to decode data and generate an acknowledgment (ACK) for a successful decoding of the data or a negative acknowledgment (NACK) for an unsuccessful decryption of the data. If sufficient time is allocated before an ACK / NACK is transmitted, the UE may consider the supplementary transmission as part of initial data decoding. A second option for supplementary transmission may be to use HARQ retransmission of the latency-tolerant data acquired by preemption based on an ACK / NACK procedure. The UE tries to decode the received data and if the UE is unsuccessful, the UE sends a NACK. The base station then retransmits based on data that was not sent because of the preemption event. The data sent before or after generating the ACK or NACK can be the same or a different version of redundancy than the data acquired by preemption.
[068] Figure 6 illustrates an example of a transmission resource that has staggered transmission predominantly of latency-tolerant traffic, but allows low traffic
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33/91 latency to preemptively acquire latency-tolerant traffic when appropriate.
[069] Figure 6 illustrates a combination of the three central DL slots / slots 810, 820 and 830 where the first slot 810 includes control information 811, HARQ feedback 813 and stepped transmission features 812, 814 for two EMBB UEs. However, in the transmission resource 812 allocated to the UEMB 2 of eMBB, a subpart 816 of the transmission resource 812 is drilled for transmission of URLLC traffic. Similarly, in the transmission resource 814 allocated to UE 1 of eMBB, a subpart 818 of transmission 814 is drilled for transmission of URLLC traffic. The second and third intervals 820, 830 include control information 821, 831, HARQ feedback 823, 833 and transmission facilities for data transmission. A portion 822 of the second slot 820 is a location used for additional transmission of traffic to the UE 1 of eMBB that was acquired by preemption of the first staggering interval 810. This additional transmission is an automatic transmission at a predefined or staggered location in a frame subsequent. This is an example of the first option described earlier. Although the supplementary transmission illustrated in Figure 6 is shown to occur in the second interval 820 immediately subsequent to the first interval 810, it is understood that the supplementary transmission can be in any subsequent staggered interval as long as the interval occurs before a time when the HARQ feedback is scaled for data acquired by preemption of the first interval. A portion 832 of the third interval 830 is a
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34/91 location used to transmit traffic to the eMBB UE 2 that was acquired by preemption of the first 810 slot. This retransmission is done in response to receiving a NACK on the HARQ 823 feedback, shown here being transmitted at the end of the second 820 slot This is an example of the second option described earlier. The retransmission can be a different version of redundancy than the data acquired by preemption of the first frame.
[070] Various techniques can be used to notify an UE that he is affected by preemption. As used in this document, the term supplemental transmission refers to a transmission, based on data acquired by preemption, that occurs after an impacted latency-tolerant TTU, but before HARQ feedback is provided by a UE. A supplementary transmission can be combined with an initial impacted transmission for decoding purposes. HARQ feedback, in the form of an acknowledgment (ACK) or negative acknowledgment (NACK), can be transmitted by the UE after receiving the supplementary transmission. Some techniques involve notifying the UE that an additional transmission will occur. Some techniques involve notifying the UE that a preemption event has occurred. Some techniques involve notifying the UE of a location where preemption occurred in the impacted escalation interval so that the UE can determine what part of the expected traffic was acquired by preemption. Some techniques may include one or more of the notifications identified above.
[071] In order to signal notifications to the UE, there are multiple different mechanisms revealed in this document. Some notifications explicitly define whether
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35/91 a preemption has occurred, if a supplementary transmission has occurred, the location of the preemption and the location of the supplementary transmission or retransmission. Some notifications can be derived implicitly by the UE based on information that is transmitted to the UE. In some implementations, the UE may be preconfigured to expect a supplementary transmission at a predefined location for a subsequent escalation interval, if a preemption occurs and is indicated for the UE.
[072] Signaling for one or more types of notifications can occur in the same preemption interval, in an interval subsequent to that of preemption or in a combination of the two locations. In some implementations, notifications can be transmitted on the Physical Downlink Control Channel (PDCCH), specific to UE or on group common PDCCH.
[073] In one modality, UE-specific DCI contains preemption information and it is sent in the next slot after the impacted eMBB interval. The DCI format used to send preemption information can contain at least Identity, Resource Information that contains preemption information, and exclude the required field otherwise for regular DL and UL granting. Some filling bits can be added if necessary. A flag can be added if the size matches any other DCI format.
[074] Modalities of multiple different indication signaling techniques and example implementation details are revealed below.
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36/91 [075] A first aspect of the disclosure concerns the relationship between notification of latency-tolerant traffic preemption in a first escalation interval and execution of an additional transmission of the latency-tolerant traffic acquired by preemption in a subsequent escalation interval . Traffic preemption notification can be independent of overhead transmission. For example, the notification may indicate that preemption has occurred, but it does not define where the further transmission will occur. The supplementary transmission can be sent at a pre-configured location in such a way that the UE knows where to monitor the supplementary transmission, in which case the UE does not need to be explicitly notified about the location. The location of the preemption event indication can be during or after the impacted TTI. In some implementations, the notification of overhead transmission may be transmitted in a common Downlink Control Information (DCI) message or channel from a subsequent interval. In some implementations, a new data indicator field (NDI) of the DCI message is used to notify the UE of the further transmission. If the NDI field is false for the same HARQ process ID and the transmission takes place at a subsequent interval, but before the HARQ timeline, the UE determines that the transmission corresponds to the initial impacted transmission. In some implementations, in the notification of the supplementary transmission DCI message a field is included to notify the UE of a reconfigured HARQ feedback moment. This allows the base station to extend a previously established HARQ feedback moment so that
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37/91 the UE will allow sufficient time to receive a supplementary transmission if a preemption event has occurred. Additional details will be provided below.
[076] In other implementations, the notification of supplementary transmission signaling may be sent in conjunction with the preemption indication, or may depend on a previous preemption indication.
[077] A second aspect of the description provides a process for notifying the UE of a preemption event. Part of the process involves sending a notification, which can indicate to the UE one or more of: a) whether the eMBB UE is in a coexistence region, b) the HARQ time setting for one or more UEs and c) one size of an indication channel. The notification can be sent in a semi-static mode, dynamic implicit mode or in an explicit dynamic mode. An additional part of the process involves sending a notification of the preemption event, if a preemption event has occurred. The preemption event can be in the same stepped interval or in a subsequent stepped interval. Additional details will be provided below.
[078] A third aspect of the description provides a DCI format for notification of supplementary transmission. The supplementary transmission can be staggered independently or sent as part of another concession or part of another transmission block (TB). The DCI may include the location of the overhead transmission when the overhead transmission is staggered as part of another concession or TB. Additional details will be provided below.
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38/91 [079] A fourth aspect of the description provides a format for an indication channel that can provide a preemption event indication or a supplementary transmission notification indication, or both. Additional details will be provided below.
[080] In one embodiment, an HARQ moment field in the DCI can implicitly notify the eMBB UE that it can expect preemption, specifically if a larger HARQ timeline is flagged.
[081] In a unified referral channel design that includes both the preemption event indication and the supplementary transmission notification indication, a latency-tolerant traffic escalation interval length (ie eMBB traffic) is configurable to accommodate the way traffic is staggered. Traffic can be staggered in a slot or slot aggregation format. Therefore, the size of the scaling format corresponds to the size of the indication channel and the larger the scaling format the larger the indication channel. The preemption indication can be formed as an aggregation of a basic unit size. In a particular example, 12 resource elements (REs) form a basic unit size that is considered to be a single unit Indication Channel Element (ICE), similar to the control channel element (CCE) as used for build PDCCH. The referral channel can also be formed from an aggregation of multiple ICEs. Individual UEs can support a different number of ICEs for blind detection (BD). In some implementations, a single ICE or an aggregation formation of multiple ICEs can be used to accommodate the length of
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39/91 an eMBB range being configurable to be of different sizes at different intervals. In some implementations, the referral channel information can be scrambled using cell ID. Therefore, eMBB UEs near the edge of a base station server area can avoid misreading an indication of a neighboring cell because it is scrambled by the neighboring cell ID. Based on the length of the escalation interval or the level of aggregation, eMBB UEs know the size of the search space that can contain the referral information.
[082] A fifth aspect of the description provides a common group channel design for use when providing a preemption event indicator, a supplementary transmission notification indicator, or both. Implementations of the common group channel project may include the use of a Temporary Radio Network Identifier (RNTI), a Group RNTI, or both. In this example, a common group channel design is a channel design for transmitting a common group control signal. The Referral RNTI is a temporary identifier that is used to identify a particular preemption event. The Indication RNTI is used as part of the common group control signal so that it is identified by the UEs monitoring the control signal. The group RNTI is a temporary identifier that is used to identify a group of UEs for which information is assigned. Additional details will be provided below.
[083] The following section describes a combined indication signal design for both the preemption event indicator and the transmission notification indication
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Supplementary 40/91, for notification during the escalation interval when a preemption event occurs. The indication signal includes at least two specific EU fields. The first field is a single bit field that notifies if there will be an additional transmission. For example, a 0 indicates that there is no supplemental transmission and a 1 indicates that there is an additional transmission. A second field is a multi-bit (x-bit) field that notifies the UE of a time-frequency location of the preemption event within the range. The value of x depends on a fine granularity for indication within the scaling range, that is, the minimum size transmission range that can be scaled within the scaling range. Examples of the scaling interval granularity include, but are not limited to, a Code Block (CB), a group of CBs, a symbol, a group of symbols, or a Resource Block Group (RBG).
[084] An UE can determine whether there is both a new transmission and a supplementary transmission occurring over the next interval on different resources by detecting an additional 1-bit field in the indication signal during an impacted interval. The additional 1-bit field can notify the UE of whether a lease exists for the UE at a subsequent interval before the HARQ feedback is provided by the UE. The combination of the 1-bit field in the preemption indication and the additional 1-bit field identifying the lease for a new transmission to the UE allows the UE to determine what to expect in a subsequent interval.
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41/91 [085] The following section describes a combined indication signal design for notification of a preemption event that occurs in a first escalation interval and notification of a supplementary transmission that occurs in a second escalation interval subsequent to the first escalation interval. Both notifications are transmitted in a control region of a subsequent escalation interval, as opposed to notification in the same escalation interval in which the preemption event occurred as previously described. The preemption event indication and the supplementary transmission notification indication can be sent together on a common group channel. The preemption indication can include a single bit for notification of a supplementary transmission. For example, a 0 indicates that there is no supplemental transmission and a 1 indicates that there is an additional transmission. In some implementations, explicit concession for supplementary transmission is not used. Instead of an explicit grant, if the single bit is set to a value recognized as true, an additional transmission to impacted UEs will be transmitted in a subsequent escalation interval that is associated with the control region including the indication information. The supplementary transmission may be sent on the same transmission resource as the subsequent staging interval as staggered on the preemption event interval or on some other transmission resource that has been pre-arranged.
[086] Figure 7 illustrates an example of two scheduling intervals 910 and 920, each having a region of
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42/91 control 912 and 922. The second control region 922 includes a common group control channel 924 to provide information regarding the preemption event indication, the supplementary transmission notification indication, or both. Figure 7 illustrates the supplementary transmission 926 of data that was originally staggered in the first 910 frame, which was acquired by preemption by the URLLC 914 data, using the same resources in the second 920 slot as intended in the first 910 slot.
[087] Other modalities may include only supplementary transmission information being sent on the common group channel, such as the opposite of both the preemption event indication and the supplementary transmission notification indication being sent together.
[088] In some implementations, locations allocated for the indication of preemption on the Physical Downlink Control Channel (PDCCH) that are monitored by latency-tolerant UEs are preconfigured, so that latency-tolerant UEs know where to monitor the information of preemption indication control. Preemption indication control information is allocated to at least one location per latency-tolerant slot. The particular location of the preemption indication control information within the slot is implementation specific.
[089] Figure 8 illustrates the 1012 transmission feature, which is a part of a first 1010 scheduling interval being used for transmitting URLLC traffic. In Figure 8, the scaling interval is a slot and the 1012 transmission feature occupies a part of the slot that is a minislot. The URLLC traffic preempts the traffic
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43/91 eMBB that would otherwise have been transmitted on the 1012 transmission resource. The eMBB traffic that was allocated to the 1012 transmission resource is instead transmitted as a supplementary transmission on a second interval transmission resource 1022 scheduling 1020. The transmission resource 1022 in the second scheduling interval 1020 is located in the same relative position as the transmission resource 1012 in the first interval 1010. In Figure 8, the scheduling interval has a length of 7 symbols. A first symbol in each interval is for control and reference signals (RS) and the remaining six symbols are for payload. In another embodiment, the first symbol contains a control region and a second symbol contains RS. It is understood that some symbols at the beginning of the slot contain control or RS. Some of the symbols can contain both control and RS. A minislot can be two symbols long, so there are three minislots per escalation interval. Figure 8 also shows an indication of preemption event 1014 in the first interval 1010.
[090] Figure 9 includes the same first slot as in Figure 8, but in the second slot, and instead of the supplementary transmission being located in a minislot in the same location as the traffic acquired by preemption of the first interval, the supplementary transmission is located in the total payload portion of the range on a single subcarrier.
[091] Figure 10 illustrates an example of a first scaling interval 1210 that is four slots long and a second scaling interval 1220 that also
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44/91 has a length of four slots. A transmission resource portion 1214 of the second slot 1212 of the first slot 1210 is acquired by preemption. The latency-tolerant traffic that has been scheduled to be transmitted in the second slot 1212 of the first slot 1210 is transmitted in a transmission resource portion 1224 of the first slot 1222 of the second slot 1220. Figure 10 also shows a preemption event indication 1216 in the first 1210 interval.
UE Behavior for Supplemental Transmission [092] When the UE receives the supplementary transmission, there are several ways in which the UE can process data received from a previous escalation interval that was impacted by preemption and supplementary transmission.
[093] When the overhead transmission occurs only for a short duration after the initial impacted transmission, the UE can use the data in the overhead transmission to decode a combination of data in the initial impacted transmission, except for the perforated location data, and the data supplementary transmission.
[094] If the amount of data acquired by preemption is small, the supplementary transmission may extend over a minislot duration or a slot duration, depending on whether the initial transmission is based on slots or an aggregation of slots.
[095] In some implementations, when the size of the supplementary transmission exceeds a certain threshold, the UE will regard the supplementary transmission as a partial retransmission. The UE combines data in the initial impacted transmission, except for the perforated location data, with the data
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45/91 in partial retransmission and then tries to decode the combined data. After the UE combines the initial transmission and partial retransmission and attempts to decode the data, the UE generates HARQ feedback.
[096] In some implementations, when data is acquired by preemption in a first interval and a supplementary transmission is sent in a second interval, HARQ feedback is delayed by at least one slot to allow the UE to have an opportunity to receive and attempt to decode the supplementary transmission before the HARQ feedback is generated. The base station can send updated HARQ moment configuration information in the UE-specific DCI to notify the UE to delay the normal HARQ feedback moment. If the HARQ feedback is staggered long enough to allow the UE to receive the supplementary transmission, the configured HARQ time may not be impacted. Latency-tolerant UEs, if staggered on a time-frequency resource where low-latency traffic is expected, can be signaled with a longer HARQ feedback moment duration in a field in the DCI.
[097] In some implementations, the UE may be notified using higher layer signaling to indicate whether the UE should delay HARQ feedback to allow time for an additional transmission.
PCI-Based Referral Project [098] In some implementations, the preemption event indication is transmitted during the impacted eMBB TTI and a DCI containing information regarding the supplementary transmission, or a retransmission, is transmitted in a TTI
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46/91 of subsequent eMBB. A supplementary transmission is a data transmission that was acquired by preempting an earlier interval, but that occurs before HARQ feedback signaling. A retransmission is a data transmission from an earlier interval that has not been successfully decoded and is initiated based on HARQ feedback signaling. The DCI NDI field can be used to indicate a supplementary transmission. If the NDI field is false for the same HARQ Process ID, as for the initial transmission, it can indicate a supplementary transmission related to the impacted eMBB transmission. The HARQ Process ID is used to identify data when multiple parallel retransmissions are taking place. When the supplementary transmission or retransmission is received, the UE can then combine the supplementary transmission with the initial transmission, or attempt to decode the retransmission, and send an ACK or NACK based on whether the transmission was successfully decoded.
[099] In another particular implementation, the preemption event indication and supplementary transmission information, if any, are both provided through DCI.
[0100] In some embodiments, a process for providing additional indication and transmission can be adopted using either a common region for multiple UEs or a specific EU region. A common region in the DCI can be used to send multicast information regarding preemption drilling to multiple UEs. The specific UE region contains at least one field, for example, the NDI, which can be used to notify the UEs as to whether there is or
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47/91 not a supplementary transmission. A common DCI is used to send a preemption indication to a group of UEs. An EU-specific DCI is used to notify individual UEs in the group about their supplementary transmissions. The UE-specific DCI can be sent at the same interval where the preemption indication is sent or at a subsequent interval.
[0101] The preemption event indication and the supplementary transmission notification indication can be sent in the same control region or in different control regions. For example, if transmitted in different control regions, the preemption event indication can be transmitted in a first control region and the supplementary transmission notification indication can be transmitted in a subsequent control region. The first and second control regions can be in the same scaling interval or in different scaling intervals.
Project Like PHICH For Supplemental Transmission [0102] A new channel is proposed to indicate supplementary transmission from the base station to UEs that the base station is serving. The new channel can be referred to as a Physical Supplemental Transmission Indication Channel (PSICH).
[0103] A one-bit field is used in each Transmission Block (TB) to signal the occurrence of a supplementary transmission.
[0104] In some modalities, several PSICHs can be multiplexed by code. In addition, in some embodiments, PSICHs multiplexed by code can then
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48/91 be shuffled using a hypercell sequence. A PSICH region can be used for multiple TBs. The PSICH format can adopt features similar to those of the PHICH channel.
[0105] This approach can be adopted for supplementary non-adaptive transmission. For a non-adaptive supplementary transmission, the same configuration for transmission of the supplementary transmission is used as it would have been used to send the encoded bits had they not been acquired by preemption. In some embodiments, this means that the same MCS and resource allocation are used for supplementary transmission as proposed to be used for traffic that was acquired by preemption. In some embodiments, parameters such as MCS are the same, but the allocation of resources can be a pre-configured location.
PCI-Based Design Details [0106] A further transmission of data acquired by preemption of a previous scheduling interval can occur within the same scheduling interval as another concession. According to some aspects of the present application, a process is provided having a low overhead that enables an eMBB UE that is impacted by a preemption event to know where to locate the supplementary data transmission in a subsequent escalation interval that was acquired by preemption in a previous escalation interval.
[0107] A supplementary transmission can be made at: 1) immediately after the control region or 2) at the same location where preemption occurred at a subsequent interval.
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49/91 [0108] Figure 11 illustrates the two consecutive escalation intervals 1310 and 1320. There is a Downlink (DL) control part 1312, 1322 at the beginning of each interval 1310, 1320. In the first interval 1310, the data of URLLC 1314 preemptively acquire a piece of eMBB data that has been scaled for particular transmission resource. The control information DL 1322 of the second interval 1320 includes an indication 1324, which is a preemption event indication or a supplementary transmission notification indication, or both. In the second slot 1320, examples of two locations for further transmission are illustrated. With reference to a first example, the eMBB data acquired by preemption is shown as being scheduled for further transmission at a location 1326 immediately after the control information DL 1322 containing the indication for the second interval 1320. With reference to a second example, eMBB data acquired by preemption is shown as being scaled for further transmission at a location 1328 that is in the second slot 1320 in the same location where the eMBB data was originally scaled in the first slot 1310.
[0109] A pre-configured arrangement of the location of the supplementary transmission to be used by the base station, which is known to the UE, avoids the use of additional signaling to explicitly define the location of the supplementary transmission in the new TB.
[0110] Notifying UEs regarding the pre-configured location of the supplementary transmission can be done using
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50/91 implicit or explicit signaling. An example of implicit signaling occurs when the indication notifies the UE of an amount of a staggering interval that has been acquired by preemption for transmission of low latency traffic. If the amount of data acquired by preemption exceeds a threshold, the UE infers that an additional transmission will be made at a pre-configured location known to the UE. This location can be configured semi-statically and maintained until a notification is signaled to change to a different preconfigured location. Notification of a change in the preconfigured location used to send overhead transmission can be sent via higher layer signaling. A first non-limiting example of a location for a preconfigured resource for supplementary transmission is immediately after the control region for a subsequent escalation interval. A second non-limiting example of a location for a preconfigured resource for overhead transmission is at the same relative location in a subsequent escalation interval such as the location of data acquired by preemption in the original escalation interval.
[0111] Explicit signaling may involve using a 1-bit field in a specific UE region in a similar way as used in an NDI field that defines two options for localization. For example, if the 1-bit field is 0 then the supplementary transmission is located immediately after the control region of a subsequent scaling interval and if the 1-bit field is 1 then
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51/91 the supplementary transmission is located at the same location in a subsequent scheduling interval such as the data acquired by preemption of the original scheduling interval.
[0112] Two examples of the DCI format and how they can be used are described below.
[0113] The first example involves staggering the supplementary transmission independently of other data. In some implementations, DCI may use fields similar to those of regular DCI LTE formats. The DCI for supplementary transmissions may not require all fields that are typically included in a regular DL grant. In some implementations, DCI may include fields such as, but not limited to, a resource allocation field, a field such as HARQ ID, an identity field, an MCS field and a redundancy version field (RV). The resource allocation field defines the transmission resource for the supplementary transmission. The HARQ ID field links a supplementary transmission to an original transmission. The identity field defines the UE for which the PDCCH is proposed. The MCS field defines the modulation and coding scheme used for the supplementary response. The RV field defines the amount of redundancy added to the supplementary transmission while encoding the channel. It is understood that the proposed compact DCI format may include some additional fields as necessary for proper reception of the PDCCH. For example, the DCI format can use a flag to provide the DCI type, in which case it is the same size as another DCI format. He too
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52/91 can include filler bits, if necessary, so that it can match some of the chosen DCI sizes.
[0114] If an impacted UE treats a transmission in a subsequent escalation interval as a retransmission (that is, the UE will not use as part of an initial decoding) or a supplementary transmission (that is, the UE will use as part of the initial decoding) ) may be a function of the scaled TB size or the size of the preemption event, or both.
[0115] If the latency-tolerant UE is staggered on a time-frequency resource where low-latency traffic is expected, the UE can be configured or signaled to have a longer HARQ feedback moment duration so that the UE can combine the initial transmission and the supplementary transmission, and produce an ACK / NACK later.
[0116] The UE follows a configured or flagged HARQ moment that defines how many TTIs the UE waits before sending HARQ feedback.
[0117] The second example involves the supplementary transmission being staggered along with other new data. In some implementations, DCI may use fields similar to those of regular DCI LTE formats. Examples of how to distinguish the overhead transmission from new data may include using a different HARQ process number for each of the overhead transmission and the new data or using an NDI bit that when true identifies an overhead transmission.
[0118] In some implementations, a single bit field is used as a signal to identify that there is a supplementary transmission. If this signaling is
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53/91 true, meaning that there is a supplementary transmission, the UE proceeds to determine the size of the supplementary transmission based on the UE's knowledge of the size of a subsequent escalation interval and the size of new data in the subsequent escalation interval. The difference between the size of the subsequent scaling interval and the size of the new data in the subsequent scaling interval is the supplementary transmission size.
[0119] According to one aspect of the request, another process is provided to send a preemption event indication. In some implementations, as described earlier, a transmission resource may include an eMBB-only region and a coexistence region that can be predominantly for eMBB traffic, but URLLC traffic can be scaled in the coexistence region as needed. A first step may involve the base station signaling an indication of whether an eMBB UE is scheduled for transmission in the eMBB-only region or in the coexistence region. If the UE is staggered only in the eMBB region, the UE does not monitor potential indications of data acquired by preemption.
[0120] The first step of signaling the indication may involve signaling in a specific UE mode in such a way that UEs are signaled individually; or in a group-based mode of UEs in such a way that multiple UEs are signaled collectively. When flagged in UE group-based mode, any UEs staggered for transmission in the eMBB-only region can be flagged as a first group and staggered UEs for transmission in the
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54/91 coexistence region can be signaled as a second group.
[0121] Signaling can be implicit or explicit. Explicit signaling can be additionally semi-static or dynamic. Semi-static signaling can be sent via RRC signaling or system information. Dynamic signaling can be sent via EU-specific or group-common DCI or any other control channel configured in the data region.
[0122] A second stage, occurring after the first stage, involves sending the preemption event indication.
[0123] The second step of signaling the preemption event indication can be performed in the impacted TTI or in a subsequent TTI.
[0124] The signaling of the first stage in the DCI can also let UEs know the configured HARQ moment used to support supplementary transmission. For example, in the case of a single bit being sent in the first step, a 1 can indicate that the UE should use delayed HARQ moment (ie, a delayed ACK / NACK) if the second step occurs and a 0 can indicate a pattern where there is no change to the standard HARQ feedback time.
[0125] Using this process to signal the indication can decrease the complexity of certain processes that are executed by the UE because of the less overhead and simplicity of what is being transmitted. In a situation where the UE is staggered only in a latency-tolerant region, not in a coexistence region, and notified as such by the first referral, the second referral does not need to be sent, thereby reducing overhead and resulting
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55/91 in the fact that the UE does not have to monitor the second statement. The process can also reduce the number of blind detection (BD) attempts by the UE. For example, if the first indication notifies the UE that the UE is staggered only in a latency-tolerant region, not in a coexistence region, the UE does not need to run DB as part of monitoring notifications of a preemption event that may occur in the coexistence region.
[0126] Figure 12 illustrates the two scheduling intervals 1410 and 1420. Each interval includes a 1412 coexistence region and an eMBB 1422 traffic-only region. Near the beginning of the first 1410 interval there is an indication 1414 in the 1412 coexistence region. for any UEs staggered in the coexistence region 1412. The transmission of indication 1414 is representative of the first step described above involving the base station signaling an indication of whether an eMBB UE is scheduled for transmission in the eMBB-only region or in the coexistence region . Near the end of the first interval 1410 there is an indication 1416 in the coexistence region 1412, for one or more UEs staggered in the coexistence region, that some of the data was acquired by preemption in the first interval 1410 as a result of the URLLC traffic 1415. The indication transmission 1416 is representative of the second step of signaling the preemption event indication. The indication at the end of the first interval can be a specific UE indication for the one or more UEs that are affected by preemption or it can be a group-based indication to notify all UEs in the region of
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56/91 coexistence that there is an additional transmission that the UEs can expect in a subsequent interval.
Unified Referral Project [0127] Data transmissions from eMBB to a UE can use a single slot or an aggregation of slots. As a result of the configurability of the data size of eMBB, time domain information in the indication may vary in size. Another aspect of the present application provides a configurable referral channel for use during the impacted TTI. The configurable referral channel can enable a unified project that addresses the variability of eMBB data size.
[0128] Signaling for UEs can identify the size of the indication channel. Signaling can be implicit or explicit. Explicit signage can also be semi-static or dynamic in nature.
[0129] In a situation where an eMBB DCI sent by the base station notifies the UE of the number of slots in which the UE data is aggregated, the indication channel size is assumed implicitly by the UE as described below.
[0130] The indication channel is formed as an aggregation of basic units. In a particular example, a Referral Channel Element (ICE) corresponds to N Resource Elements (REs), which can be considered as a Resource Element Group (REG). A longer interval may require an indication channel size having a greater capacity to precisely capture preemption event information because there is more capacity for preemption events to occur.
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57/91 [0131] In some scenarios, rules can be applied to generate a referral channel. For example, for a situation where 1 <x <N URLLC escalation intervals occur within an eMBB interval, where x is a real number of URLLC granularity contained within the eMBB interval and N is a predetermined constant relating to with a signal granularity, the size of the indication channel can be 1 ICE. So, when N <χ <2N distinct URLLC transmission resources occur within the eMBB range, the referral channel size can be 2 ICEs and so on. The ICE can be the same structure or size as a CCE.
Common Group Control Channel [0132] A way to implement a common group control channel to provide the indication for the preemption event, for the supplementary notification event, or for both, involves a given base station using a Physical Channel Group Downlink Control (PDCCH). The common group PDCCH including the indication can be detected by the UE using a Temporary Radio Network Identifier (RNTI) of Indication or any other group identifier that relates to preemption of latency-tolerant TTUs.
[0133] Preemption information sent using a common group PDCCH can be transported in several different ways. One option is to send information about low-latency preemption events to a group of latency-tolerant UEs. Alternatively, preemption information can be sent in a specific UE mode in the common message. Details of these options are provided below.
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58/91 [0134] Affected UEs can be notified of URLLC preemption events occurring in an escalation interval prior to that of the escalation interval including the common group PDCCH. The base station can limit the number of preemption events that can occur in an interval. The indication portion of the common group control PDCCH can then be divided into a number of fields that is equal to the maximum number of preemption events that can occur. Each field can then be used to transmit information regarding a respective preemption event. Each field can contain the time-frequency resource information for each preemption event. The granularity of time and frequency information is configurable. For example, configurability in the time domain may include a URLLC slot / minislot index and configurability in the frequency domain may be in the form of RBs or RBG.
[0135] In some implementations, eMBB UEs can be notified by the base station serving preemption events that refer specifically to them. There can be a maximum number of UEs that are supported in each escalation interval. For each UE there may be a respective field that allows the UE to be notified of any part of the UE's staggered resource that has been acquired by preemption. Each field can have a different indication granularity. Granularity can be limited to indicating only time, only frequency, or as long as frequency. The granularity of time and frequency information is configurable. For example, a group of symbols or minislot in time and RBs or RBG or subband in frequency.
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59/91 [0136] Figure 13 illustrates a time-frequency resource interval divided into an FDM mode. Here, division by FDM means that resources are scaled to UEs in FDM mode at the beginning of the range. A first bandwidth 1510 is allocated to a first UE. A second 1520 bandwidth is allocated to a second UE. A third 1530 bandwidth is allocated to a third UE. A fourth 1540 bandwidth is allocated to a fourth UE. A fifth 1550 bandwidth is allocated to a fifth UE. The first and second bandwidths 1510 and 1520 are considered to be a first part of bandwidth 1560 for a first group of UEs including the first and second UEs and the third, fourth and fifth bandwidths 1530, 1540 and 1550 are considered to be a second piece of bandwidth 157 0 for a second group of UEs including the third, fourth and fifth UEs. Therefore, indications that must be sent to the first and second UEs can be shuffled using a Group ID of the first group of UEs and indications that must be sent to the third, fourth and fifth UEs can be shuffled using a Group ID of the second group of UEs. In the case of Figure 13, a first preemption event 1580 occurs on a staggered resource for UEs 1 and 2, a second preemption event 1582 occurs on a staggered resource for UEs 3, 4 and 5, and a third preemption event 1584 occurs on a staggered resource for UEs 1, 2, 3, 4 and 5. The group ID or RNTI is formed based on a bandwidth partition. In this example, for each part of bandwidth 1560 and 1570, an indication is sent that is monitored by the group of UEs staggered within the part of
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60/91 bandwidth. Each indication is scrambled by means of an ID or RNTI. A latency-tolerant transmission belonging to one or more bandwidth partitions can be monitored using the proposed common group message for one or more bandwidth partitions.
[0137] In a particular example, a preemption indication part of a common group PDCCH is used for indicating preemption event. This part has an indication field corresponding to each of the maximum allowed number of URLLC preemption events. If there are three preemption events, the first three referral fields will include information to notify the affected UEs, or groups of UEs, of each of the three preemption events. In the particular example, the preemption locating part of the group common PDCCH has an indication field corresponding to each of a maximum number of active UEs being served by the base station. Using the common group PDCCH to notify five affected latency-tolerant UEs of the respective preemption events that affect them as described above, the first five fields would include information to notify each of the five UEs, respectively, of the preemption events that occurred. refer to them. In the particular example, the preemption indication part of a group common PDCCH has ten fields and the preemption location part of the group common PDCCH has ten fields, but it is to be understood that the field sizes are implementation specific and can be larger or smaller than 10 fields.
[0138] A mapping function can be used to indicate the relationship between the common channel message field
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61/91 group and the allocated UE. An example mapping function is mod (i, L), where 1 is the starting RB index of a UE and L is the total number of UEs. Because there may be ambiguity if for multiple UEs the result of mod (i, L) is the same value, a displacement field can also be indicated. The network can use the offset field to avoid overlap. Offset value will be different to resolve ambiguity. For example, mod (i, L) + offset can give the location of the field to the UE for which i is the first RB index.
[0139] Alternatively, instead of an explicit shift field, a combination of different existing fields in the DCI may implicitly indicate the shift.
[0140] Another way to implement a common group control channel to provide the indication involves one or more server base stations using multiple common group PDCCHs, each including an indication that can be detected when using a group RNTI. Note that group RNTI is used in a general context where RNTI is used by a group of UEs. In the context of the examples, the RNTI used for a transmission indication, that is, indication RNTI is a group RNTI where a group of UEs uses the RNTI to identify the PDCCH when it is transmitted. Different common PDCCH can be sent based on the division of transmission resources. Figure 14 illustrates a time-frequency resource interval in which the resource is divided into an FDM mode. A first 1610 bandwidth is allocated to a first UE. A second 1620 bandwidth is allocated to a second UE. A third 1630 bandwidth is allocated to a third party
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HUH. A fourth 1640 bandwidth is allocated to a fourth UE. A fifth 1650 bandwidth is allocated to a fifth UE. A sixth 1660 bandwidth is allocated to a sixth EU. The first, second and third bandwidths 1610, 1620 and 1630 are considered to be a first part of bandwidth 167 0 for a first group of UEs including the first, second and third UEs and the fourth, fifth and sixth bandwidths. band 1640, 1650 and 1660 are considered to be a second part of bandwidth 1680 for a second group of UEs including the fourth, fifth and sixth UEs. In the case of Figure 14, a first 1690 preemption event occurs on a resource that is staggered to the first, second and third UEs. In this case a single common group PDCCH is used to notify all UEs in the first group of UEs about the URLLC preemption event. If there was a second preemption event in the resources used by any of the second group of UEs, a second group common PDCCH would be sent notifying the second group of UEs. The capacity of the group common PDCCH is limited and for this reason it may be advantageous to minimize the size of the portion of the group common PDCCH used for transmitting the indication. When compared to the example shown above where the preemption event location part of the group common PDCCH has ten fields corresponding to a maximum number of active UEs being served by the base station, if there are only five active UEs, the additional five fields are overhead unnecessary. In addition, if only two of the five active UEs need to be notified of a preemption event, then it would be more efficient (ie less overhead)
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63/91 unnecessary) to populate and send only two fields to notify the two affected UEs.
[0141] Therefore, in order to use the group common PDCCH efficiently, a single bit can be sent during an impacted escalation interval to notify preemption affected eMBB UEs to monitor the group common PDCCH to determine how the UEs are affected, which would allow the group common PDCCH to be smaller because it needs to provide information only to the affected UEs. This can be useful when the common group PDCCH has a small number of fields. Similar to the one previously described, a start and / or offset RB index can be used to implicitly notify the UE as to which field to access in the common group PDCCH.
[0142] In an example, a common group PDCCH can be sent which can have M fields corresponding to the time granularity of URLLC traffic or a group of symbols, each of these M fields can be further subdivided into N fields, the which contain preemption information in the frequency domain for each granularity or field in the time domain. EMBB UEs that transmitted in the previous slot monitor this in the next slot. In another example, a common group PDCCH can be sent for each URLLC traffic time granularity or for a group of symbols. Within the common PDCCH, there can be N fields where each field contains pre-emption information in the frequency range based on subband or RBG.
[0143] Figure 15 illustrates a time-frequency resource interval in which the resource is divided into an FDM mode. A first 1710 bandwidth is allocated to a
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64/91 first EU. A second 1720 bandwidth is allocated to a second UE. A third 1730 bandwidth is allocated to a third UE. A fourth 1740 bandwidth is allocated to a fourth UE. A fifth 1750 bandwidth is allocated to a fifth UE. In the case of Figure 15, a first preemption event 1760 occurs in a resource escalated to the first and second UEs, a second event of preemption 1770 occurs in a resource escalated to the third, fourth and fifth UEs, and a third event of preemption 1780 occurs in a staggered resource for the first, second, third, fourth and fifth UEs. A bitmap having a single bit allocated to each UE can be sent during the escalation interval to indicate to each respective UE if there is at least one preemption event. Then the common group control indicator can be used after the escalation interval to provide additional information, such as the location of the preemption event.
[0144] Although reference has been made to eMBB and URLLC traffic types in the description above, in particular with reference to Figures 6 to 15, more generally these types of traffic may correspond to other types of traffic tolerant to latency and low latency traffic.
[0145] For an eMBB slot range containing M minislots, there can be as many as M group RNTIs, that is, a group RNTI in each of the M minislots, which can be used to assist in the communication of preemption information between the base station and multiple UEs. The group message associated with a minislot provides information about
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65/91 preemption in the frequency domain during that minislot. The base station can notify preemption information UEs in the frequency domain using the common group PDCCH and the group RNTI associated with the minislots. EMBB UEs monitor the group messages associated with the minislots. Group messages corresponding to a minislot are sent if there is at least one preemption event that occurred during the minislot. The granularity of preemption information in the frequency domain is configurable. In another embodiment, a group message can be sent to a group of minislots or slots, instead of to each minislot, to carry preemption information.
[0146] The preemption indication, if sent during the impacted interval, can be constructed as a sequence that may or may not include RS in it. If the preemption indication is UE specific and sent anywhere in the bandwidth of the latency-tolerant transmission block, then the RS of the latency-tolerant transmission block can be used to decode the indication information. If the indication is sent on a temp frequency resource outside the bandwidth of a latency-tolerant transmission, for example, when a broadcast / multicast indication is sent, the indication sequence may or may not include RS. If it includes RS, UEs can decode the indication in a consistent way; otherwise the UEs perform non-coherent detection of the indication sequence.
[0147] A latency-tolerant escalation interval can contain multiple low-latency escalation intervals that can be based on a granularity of
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66/91 minislot or slot. Figure 20 illustrates an example of a 2100 latency-tolerant scheduling interval having the duration of the 7 symbols 2110, 2120, 2130, 2140, 2150, 2160, 2170. Bandwidth 280 is divided into the three bandwidth partitions 282 , 284, 286. Each bandwidth partition is subdivided into multiple resource blocks (RBs) or resource block groups (RBG) that include multiple resource blocks. The first bandwidth partition 282 includes RBs 290, 291, 292, 293, 294, 295. A first low latency escalation interval 2125, based on a minislot, lasts for the two symbols 2120 and 2130. The second and third low latency scheduling intervals 2145 and 2165 also have two symbol durations. For each low latency escalation interval, one or multiple common group indications are sent. Common group indications 2122, 2124, 2126 are sent in the first low latency escalation interval 2125. Common group indications 2142, 2144, 2146 are sent in the second low latency escalation interval 2145. Common group indications 2162 , 2164, 2166 are sent in the third low latency escalation interval 2165. If a common group indication is sent in each low latency interval, then the indication is broadcast to all latency-tolerant UEs and the UEs monitor the common indication in a dedicated search space, on one or more symbols of the low latency scaling interval. The common group indication contains M bits to carry preemption information in the frequency domain during the low latency interval. For example, if M is 8 bits then the bandwidth is
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67/91 partitioned into eight sub-bands. Latency-tolerant UEs monitor the 8-bit bitmap contained in the broadcast message and if their transmissions overlap with the sub-bands that are acquired by preemption partially or completely, the UEs clear temporary storage that contains data received in the interval duration low latency scheduling. The UE resumes receiving data after the low latency interval has ended. If the bandwidth is large or the UE bandwidth capacity is limited, or both, the total transmission bandwidth can be partitioned and for each partition a common group message can be sent during the scheduling interval. low latency. Common group messages for each partition can have an N-bit bitmap to provide preemption information in the frequency domain in the partition or subband. For example, if there are three BW partitions configured, then there will be three common group messages sent at each low latency interval. Research spaces can be reserved or detected blindly. In a particular example, if a preemption event does not occur on bandwidth partition 1 282 during a low latency escalation interval, the common group message is not sent to that bandwidth partition. A polling space that is not used to signal a preemption event can be used to transmit downlink data. The number of bits that make up the bitmap for carrying preemption information in the frequency domain within a common group message is configurable. There may be a set of values of a number of bits chosen per higher layer. The UEs
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68/91 latency tolerants can be signaled via system information or via dedicated RRC signaling the configuration that is to be used. The configuration can include how many bits or how the bandwidth is partitioned to send an indication in the frequency domain. Latency-tolerant UEs can also be notified via higher layer signaling if there is a common multi-group message in the BW to carry preemption information. Even the common group information discussed here can be sent on a common group PDCCH.
[0148] In another mode, a common group indication can be sent in a symbol before the low latency escalation interval. If one or more BSs already have low-latency traffic scheduling information available, at least one symbol begins before the low-latency interval, then the symbol preceding the low-latency scheduling interval can be used to send the preemption indication . In a scenario like this, latency-tolerant UEs will not have to temporarily store any data during the next low-latency escalation interval. If the indication were sent on the first symbol of the low latency interval, the latency-tolerant UEs would temporarily store at least the first symbol, if not the rest of the symbols during the low latency interval. One or multiple common group messages can be sent in the symbol before the low latency interval.
[0149] In another mode, one or multiple common group messages for the indication can be sent at the end of the latency-tolerant escalation interval.
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For example, if there is only one common group message configured to be sent at the end of the latency-tolerant interval, it will contain xy bits where x contains information in the time domain and y contains preemption information in the frequency domain. In this example, x corresponds to time divisions and y corresponds to frequency divisions within the range. 0 x can be a number of symbol groups or minislots or slots depending on the length of the eMBB scaling interval. The y can be a number of sub-bands, or RBGs or URLLC frequency minislots / granularity. Similar to the above, if the bandwidth is large, multiple common group messages can be sent at the end of the interval, each targeting a bandwidth partition or a subband. Each common group message carries information in the time domain and preemption information in the frequency domain in the subband.
[0150] In another embodiment, the common group indication sent in the PDCCH region of slot n provides preemption information for slot n - 1. A latency-tolerant UE that is staggered in slot n - 1 would monitor a common group PDCCH in the next slot to retrieve the indication information. Figure 21 illustrates an example of a transmission resource including the five slots, 2210, 2220, 2230, 2240, 2250, where each slot includes a common group PDCCH 2212, 2222, 2232, 2242, 2252. A first allocation of resource 2260 for a first latency tolerant UE occupies the parts of slots 1 and 2, 2210, 2220. A second resource allocation 2270 for a second latency tolerant UE occupies the parts of slots 1, 2, 3 and 4, 2210, 2220, 2230, 2240. A third
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70/91 resource allocation 2280 for a latency-tolerant third EU occupies a portion of slot 3, 2230. The second latency-tolerant EU monitors a common group 2222, 2232, 2242, 2252 PDCCH in slots 2 through 5, 2220, 2230, 2240, 2250, to obtain preemption information corresponding to slots 1 to 4, respectively. There may be one or multiple common group PDCCHs sent to carry preemption information. If only a common group PDCCH is sent, then all UEs monitor the common preemption information. For example, the common group PDCCH may have xy bits other than the cyclic redundancy check (CRC) attached to check the group RNTI, where x may be a symbol (s) or minislot (s) number within the ey slot can be a number of sub-bands, RBGs or URLLC frequency granularity / granularity. Values of x and y are configurable. Values are chosen by the highest layer and latency-tolerant UEs are notified via system information or RRC signaling which configuration is being used for the common group PDCCH.
[0151] In connection with the previous example, there may be multiple common group messages sent to carry preemption information. The same information can be repeated on multiple common PDCCHs. Alternatively, the bandwidth can be divided into sub-bands and each common PDCCH can send preemption information to a sub-band. Similar to the previous examples, the number of bits that can be used in each common PDCCH message is configurable.
Referral Sequence Project
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71/91 [0152] Indication information sent in the control or PDCCH region can follow the same structure as a PDCCH message. Referral information can be constructed as a group of CCEs, either contiguously or non-contiguously. If the referral message, EU specific or group common, is sent during the impacted eMBB escalation interval, it can be sent as a sequence. The display sequence can be incorporated with or without a reference signal (RS). For the option where the indication sequence is not incorporated with RS, non-coherent detection can be adopted. For example, indication information of m bits is mapped to a sequence in the frequency domain of N bits, where N is equal to or greater than m. The value of N may depend on which numerology is being used. An example of a sequence is the ZadoffChu (ZC) sequence. An indication of m bits can carry preemption information other than 2m. N should be chosen in such a way that, given the channel dispersion or expected delay spread, 2m cyclic displacement of the N point ZC sequence still remains orthogonal or almost orthogonal. For example, if m = 2 and the point k = 4 is considered as an amount of displacement, then a sequence of at least 4 x 22 = 16 = N points is necessary to ensure robust performance. The value of k <N depends on delay spread. For larger subcarrier spacing, k may be small, while for smaller subcarrier spacing k may be larger. Another example of a sequence is a PN sequence. The sequence of N points can be mapped to N Resource Elements (REs) in one or multiple OFDM symbols. Cell-specific shuffling can be performed if
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72/91 required. These N REs along with other REs carrying data from different UEs in the OFDM symbols are provided for an IFFT block and on the receiving side, the UE extracts the sequence of N points and performs a correlation check to identify which sequence of bits was sent. This non-coherent sequence-based detection method can be used when the indication is sent on a time-frequency resource outside the impacted TB's time-frequency resource, when RS cannot be used for detection. In another example, a phase rotation can be applied to the N point display sequence before the sequence values are supplied to the OFDM modulator. For consistent detection of the indication sent in part of the time-frequency resources used for transmission of impacted eMBB, the RS used for data demodulation can also be used for indication detection. Indication bits can be processed in a similar way to information bits; for example, channel encoding, modulation, interleaving, scrambling, etc. Even though the indication can be detected with the help of RS used for data demodulation, the indication is decoded / detected separately from data. Consequently, separate MCS can be used for encoding and modulating the indication message. Coherent detection can also be used for common group indication. In this case, the indication message is incorporated with RS. The UEs that are configured to follow the common group indication, detect and demodulate the indication message based on the RS incorporated in it.
Multiple Cell Preemption
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73/91 [0153] In some cases, a URLLC UE located at the edge of a server base station region may receive interference from one or more neighboring base stations.
[0154] In some implementations, the serving base station can notify other neighboring base stations via backhaul that URLLC traffic will be preemptively acquiring eMBB traffic at the serving base station. In a corresponding time for the server base station to drill through the eMBB traffic to transmit URLLC traffic, any neighboring base stations that have been notified by the base stations that host the URLLC traffic by preemptively acquiring the eMBB traffic can drill through a transmission resource corresponding scaling interval and do not transmit any traffic in order to minimize interference. Figure 16 illustrates two adjacent communication regions: a server communication region 1810 and a neighboring communication region 1820. Each communication region 1810, 1820 has a respective base station 1812, 1822. There is a backhaul connection 1830 between the two stations base 1812, 1822. A transmission resource 1814 with a preemption event and URLLC transmission 1816 is shown for the server communication region 1810. A preemption event is also shown on a transmission resource 1824 for the neighboring communication region 1820. 1826 that base station 1822 of neighboring cell 1820 escalates based on information sent in backhaul.
[0155] Depending on latency tolerance, it may be beneficial for URLLC transmission to be delayed for a period of time, for example, a minislot, to allow the server communication region to transmit and
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74/91 neighboring communication regions receive and process preemption information on the backhaul connection.
[0156] Minimizing interference in this mode can provide greater reliability for URLLC transmission.
[0157] In another modality, low latency data can be shared, at least for a staggering interval, in the backhaul with another BS of the helper / neighbor cell. The data, at least for a scaling interval, are transmitted together by BSs of different cells. It may be the case that the low-latency UE is mobile and shifting between the coverage areas of different base stations. Similar to a smooth cell-to-cell transfer process, the helper BS can send data together with the serving BS, even if the low-latency UE is not associated with the helper BS. This can occur at least for one transmission, after which the UE can be associated with the assisting BS, which can then operate as the serving BS.
Preemption Help for MIMO Latency-Tolerant Transmission [0158] In some examples of low-latency traffic preempting latency-tolerant traffic for a latency-tolerant UE, latency-tolerant traffic can be a MIMO transmission having multiple layers or streams . Therefore, multilayered time-frequency features may need to be acquired by preemption to accommodate URLLC traffic.
[0159] If the preemption indication is sent during latency-tolerant escalation, which may include transmitting a preemption indication in multiple
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75/91 locations during the interval or in a single location near the end of the interval, one or more of the following approaches can be taken:
[0160] 1) The preemption indication can be sent in only one layer. In some modalities, the layer in which the preemption indication is sent, and thus the layer that the UE must monitor, is pre-configured. In some modalities, the UE does not know the layer in which the preemption indication is transmitted, and so the UE blindly monitors the indication among the various layers. In a scenario where the referral is sent in a single layer so that multiple layers are not acquired by preemption for the referral, a scenario like this can allow more data to be sent because less overhead needs to be used for referral in other layers . However, when only a single layer is used to send the indication, the chosen layer may not necessarily have the best link quality for the layers that are available.
[0161] 2) Preemption indication information is reproduced in multiple layers. For simplicity and robustness, the preemption indication can be repeated in multiple layers. The UE can use a receive combination mechanism, for example, Maximum Ratio Combination (MRC), to combine the received indication in multiple layers for decoding. If the UE receives the MIMO transmission in M layers, the UE can receive the indication in N layers where N <= M.
[0162] 3) Preemption indication information can be divided and distributed in multiple layers. The indication can be sent in the time-frequency resources
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76/91 corresponding in different layers or in different time-frequency resources in different layers. Alternatively, the indication can be carried in the DCI of a next slot so that one or multiple layers are not acquired due to preemption of sending the indication during the impacted latency tolerant interval. Several methods of transmitting the preemption indication described above also apply to MIMO-based latency-tolerant transmission.
Multiplexing of URLLC and eMBB Control Information on Uplink [0163] As previously described, a low latency TTU, for example, based on a minislot, can preemptively acquire resources from a latency-tolerant TTU, for example, slot-based transmission. The UL control information (UCI), for example, HARQ feedback, from each transmission can use time-frequency features of a UL slot or an uplink part of a central uplink slot. Modalities are provided below for UCI resource allocation when UCIs of traffic based on both slot and minislot are sent in the same UL slot.
[0164] Similar to LTE, close to each edge of the bandwidth, some frequency resources are reserved to send information related to UCI, for example, PUCCH. A type of UCI, such as long PUCCH based on slots, can span more symbols, while a minislot's UCI would span fewer symbols.
[0165] A set of PUCCH resources is configured through higher layer signaling. To facilitate
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77/91 PUCCH resource sharing by UCI based on both minislot and slot, a scalable design can be used. For example, a PUCCH unit can be built on the basis of K symbols, where K is less than the number of symbols in the slot, and in granularity of RB or RBG in frequency. Each PUCCH unit can support up to M UEs, for example, through code multiplexing.
[0166] Long PUCCH can be formed using a scalable extension of basic PUCCH units. Long slot-level PUCCH can add more PUCCH units than a short slot-level PUCCH or minislot PUCCH. The UCI duration of a minislot may differ from transmission based on DL minislot. For example, a DL minislot covers two symbols, while the UCI for that minislot traffic covers four symbols.
[0167] In one mode, semi-static configuration can be adopted for slot-level and minislot-level UCI resources. This can be useful if there are many UEs and reserving resources would ensure that there is no collision in the configured PUCCH resources. UEs following minislot-based transmission can send UCIs in preconfigured UCI resources for minislot-based traffic.
[0168] In another mode, PUCCH resources can be shared dynamically between traffic based on slots and minislots. The DCI for minislot traffic can be shifted in time, frequency, or both to indicate which PUCCH resources / units to use. This can be useful if the network observes that a preconfigured allocation may result in a collision with another minislot / slot-based UCI. This can also be useful when there is a large amount of
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UEs that can scale and reserve a large share of resources can sacrifice UL data channel capacity.
[0169] In another modality, a combination of semi-static and dynamic sharing can be used for UCI based on minislot and slot. For example, some symbols from a UL slot may be reserved for short traffic PUCCH based on slots that may not be used for minislot traffic. Dynamic sharing can be enabled only for a part of the configured PUCCH resources. In other words, there may be some sets of PUCCH resources reserved for traffic based on minislots and slots and some sets of PUCCH resources can be used / shared dynamically.
[0170] UIS minislot can be sent as a sequence with or without RS. A minislot's UCI can be repeated in subsequent minislots, and the location can be switched to diversity.
[0171] Minislot DL DCI can also contain a field to indicate HARQ moment information. Momentary HARQ values can be configured via higher layer signaling. For dynamic UCI resource sharing, the offset that indicates the PUCCH resource set may or may not be combined with the field that signals HARQ moment information.
[0172] If data and UCI are sent together, minislot UCI can be incorporated into the UL minislot data region.
[0173] Figure 17A is a 1900 flow chart that describes an example method. Step 1902 of the method involves a step
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79/91 optional to transmit traffic in a first scheduling interval. Step 1904 of the method involves transmitting a first indication that notifies the UE of whether it can expect data preemption. An example of this is a notification of whether traffic to the UE is scheduled for transmission in a coexistence region of the first escalation interval in which more than one type of traffic can be transmitted or for transmission in a region where preemption is prohibited by the network. Step 1905 involves transmitting a second indication to the UE notifying the UE that at least part of the traffic has been acquired by preemption. This step would not occur if the first indication had indicated that the transmission of UE was in a region where preemption was prohibited. Step 1906, an optional step, involves transmitting an additional transmission including the part of the traffic that has been acquired by preemption. Step 1908, an optional step, involves receiving HARQ feedback based on whether traffic decoding was successful or not.
[0174] Figure 17B is a 1910 flow chart that describes another example method from the UE perspective. Step 1912 of the method involves an optional step of receiving traffic in a first escalation interval. Step 1914 of the method involves receiving a first indication that notifies the UE of whether it can expect data preemption. Step 1916 involves receiving a second indication at the UE notifying the UE that at least part of the traffic has been acquired by preemption. Step 1917, an optional step, involves, if there is a supplementary transmission, combining the supplementary transmission with an initial transmission and trying to
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80/91 decode the data. Step 1918, also an optional step, involves, if there is no additional transmission, trying to decode the initial transmission. An additional optional 1919 step involves sending HARQ feedback based on whether decoding was successful in step 1917 or 1919. This would include sending an ACK if decoding was successful and a NACK if decoding was not successful. An additional step, in some embodiments, may include configuring the HARQ feedback to take longer if there is a supplementary transmission to allow time to receive the supplementary transmission. The first and second indications can be sent considering the signaling methods described in the application above.
[0175] In some embodiments, aspects of the method shown in Figures 17A and 17B and described earlier can be used together with aspects of the method described in Figures 17C and 17D and described below.
[0176] Figure 17C is a 1930 flow chart that describes another example method. The method involves notifying a UE of preemption of a portion of traffic in a first escalation interval. Step 1932 of the method involves the optional step of transmitting first control information to the UE indicating a resource allocation in a first escalation interval. Step 1934 of the method involves transmitting a first indication to a UE indicating preemption of a piece of traffic. Step 1936 of the method involves transmitting a second indication to the UE indicating a location of the portion of traffic that was acquired by preemption in the first escalation interval. The first and second indications can be
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81/91 sent considering the signaling methods described in the application above.
[0177] Figure 17D is a 1940 flowchart that describes another example method. The method involves notifying a UE of preemption of a portion of traffic in a first escalation interval. Step 1942 of the method involves the optional step of receiving first control information for the UE indicating a resource allocation in a first escalation interval. Step 1944 of the method involves receiving a first indication on a UE indicating preemption of a piece of traffic. Step 1946 of the method involves receiving a second indication in the UE indicating a location of the part of traffic that was acquired by preemption in the first escalation interval. The first and second indications can be received considering the signaling methods described in the application above.
[0178] In some modalities, transmitting the first indication and second indication occurs in the first interval.
[0179] In some modalities, transmitting the first indication and second indication occurs in a second escalation interval subsequent to the first interval.
[0180] In some modalities, transmitting the first indication comprises transmitting the first indication in a first escalation interval and transmitting the second indication comprises transmitting the second indication in a second escalation interval subsequent to the first interval.
[0181] In some modalities, transmitting the first indication and second indication comprises transmitting the
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82/91 first and second indications in a common group control region.
[0182] In some embodiments, transmitting the first indication occurs within a specific UE region of the first escalation interval and transmitting the second indication occurs within a common region of a second escalation interval.
[0183] In some modalities, transmitting the first indication and the second indication comprises transmitting the first indication and the second indication in a downlink control indication (DCI) message in a staging interval subsequent to the first staging interval. In some embodiments, transmitting the first indication comprises transmitting a single bit in a specific DCI UE part, the single bit indicating that a UE should monitor a common DCI region for additional information regarding at least one of the location of the DCI part. traffic that was acquired by preemption and an additional transmission location. In some embodiments, transmitting the first indication and the second indication comprises transmitting the first indication and the second indication at one or more escalation intervals subsequent to the first interval.
[0184] Figure 18 illustrates a block diagram of a 2300 mode processing system for executing methods described in this document, which can be installed on a hosting device. As shown, the processing system 2300 includes a processor 2304, a memory 2306 and interfaces 2310, 2312 and 2314, which may or may not be arranged as shown in Figure 18. The
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83/91 processor 2304 can be any component or set of components adapted to perform computations and / or other processing-related tasks, and memory 2306 can be any component or set of components adapted to store programming and / or instructions for execution by the processor 2304. In one embodiment, memory 2306 includes non-transitory, computer-readable media. The interfaces 2310, 2312, 2314 can be any component or set of components that allow the 2300 processing system to communicate with other devices / components and / or with a user. For example, one or more of the interfaces 2310, 2312, 2314 can be adapted to transmit data, control or management messages from the 2304 processor to applications installed on the hosting device and / or on a remote device. As another example, one or more of the interfaces 2310, 2312, 2314 can be adapted to allow a user or user device (for example, personal computer (PC), etc.) to interact / communicate with the 2300 processing system. The 2300 processing system can include additional components not shown in Figure 18, such as long-term storage (e.g., non-volatile memory, etc.).
[0185] In some embodiments, the 2300 processing system is included in a network device that is accessing a telecommunications network or that is otherwise part of it. In one example, the 2300 processing system is on a network side device on a wireless or wired telecommunications network, such as a base station, a relay station, a scheduler, a
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84/91 controller, a communication port, a router, an application server or any other device on the telecommunications network. In other embodiments, the 2300 processing system is on a user side device accessing 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.
[0186] In some embodiments, one or more of the interfaces 2310, 2312, 2314 connect the processing system 2300 to a transceiver adapted to transmit and receive signaling on the telecommunications network.
[0187] Figure 19 illustrates a block diagram of a 2400 transceiver adapted to transmit and receive signaling over a telecommunications network. The 2400 transceiver can be installed on a hosting device. As shown, transceiver 2400 comprises a network side interface 2402, a coupler 2404, a transmitter 2406, a receiver 2408, a signal processor 2410 and a device side interface 2412. The network side interface 2402 can include any component or set of components adapted to transmit or receive signaling over a wireless or wired telecommunications network. Coupler 2404 can include any component or set of components adapted to facilitate bidirectional communication on the network side interface 2402. Transmitter 2406 can include any component or set of components (for example, up converter, amplifier
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85/91 power, etc.) adapted to convert a baseband signal to a modulated carrier signal suitable for transmission on the network side interface 2402. The receiver 2408 can include any component or set of components (for example, converter down, low noise amplifier, etc.) adapted to convert a carrier signal received on the network side interface 2402 to a baseband signal. The signal processor 2410 can include any component or set of components adapted to convert a baseband signal to a data signal suitable for communication on the device side interface (s) 2412, or vice versa. The device side interface (s) 2412 may include any component or set of components adapted to transmit data-signals between the 2410 signal processor and components within the hosting device (for example, the 2300 processing, local area network (LAN) ports, etc.).
[0188] The 2400 transceiver can transmit and receive signaling on any type of communication medium. In some embodiments, the 2400 transceiver transmits and receives signaling over wireless media. For example, the 2400 transceiver may be a wireless transceiver adapted for communication according to a wireless telecommunications protocol, such as a cellular protocol (eg, long-term evolution (LTE), etc.), a network protocol wireless local area (WLAN) (for example, Wi-Fi, etc.), or any other type of wireless protocol (for example, Bluetooth, near field communication (NEC), etc.). In such embodiments, the network side interface 2402 comprises a
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86/91 or more antennas / radiating elements. For example, network side interface 2402 can include a single antenna, multiple separate antennas, or a set of multiple antennas configured for multi-layer communication, for example, single input, multiple outputs (SIMO), multiple inputs, single output (MISO), multiple inputs, multiple outputs (MIMO), etc. In other modalities, the 2400 transceiver transmits and receives signaling on wired media, for example, twisted pair cable, coaxial cable, optical fiber, etc. Specific processing systems and / or transceivers may use all of the components shown, or only a subset of the components, and levels of integration may vary from device to device.
[0189] It should be noted that one or more stages 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 signaling unit or by a signaling module. Other steps can be performed by an update 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 application-specific integrated circuits (ASICs).
[0190] According to a first example, a method is provided to notify a UE of preemption of a part of
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87/91 traffic in a first staggering interval, the method comprising: transmitting a first indication to the UE indicating an additional transmission of the part of traffic that was acquired by preemption; and transmitting a second indication to the UE indicating a location of the traffic portion that was acquired by preemption in the first staging interval.
[0191] According to one aspect of the first example, the method further comprises transmitting first control information to the UE indicating a resource allocation in the first scheduling interval.
[0192] According to one aspect of the first example, transmitting the first and second indications comprises transmitting the first and second indications in the first interval.
[0193] According to one aspect of the first example, transmitting the first and second indications comprises transmitting the first and second indications in a second escalation interval subsequent to the first interval.
[0194] According to one aspect of the first example: transmitting the first indication comprises transmitting the first indication in a first scheduling interval; and transmitting the second indication comprises transmitting the second indication in a second escalation interval subsequent to the first interval.
[0195] According to one aspect of the first example, transmitting the first and second indications comprises transmitting the first and second indications in a common group control region.
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88/91 [0196] According to one aspect of the first example, the supplementary transmission occurs at a pre-configured location of the second scheduling interval.
[0197] According to one aspect of the first example, the pre-configured location is: a relative location in the second staggering interval equal to that of the traffic acquired by preemption in the first interval; or after a common group control region in the second escalation interval.
[0198] According to one aspect of the first example, the first indication comprises a single bit per transmission resource allocated from the first scheduling interval to indicate the presence of the supplementary transmission in a second scheduling interval.
[0199] According to one aspect of the first example, the transmission resource allocated from the first staggering interval is staggered into one of: a slot base; a minislot base; a slot aggregation base; and a base for aggregating minislots.
[0200] According to one aspect of the first example, when the supplementary transmission is transmitted along with another traffic concession, the method additionally comprises transmitting a new data indicator field (NDI) to indicate that there is also another staggered traffic in the second staggering interval in addition to the supplementary transmission.
[0201] According to one aspect of the first example, the method further comprises determining the size of the supplementary transmission based on the size of the second
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89/91 scheduling interval and the size of the other scheduling traffic in the second scheduling interval.
[0202] According to one aspect of the first example, transmitting the first indication occurs within a specific UE region of the first escalation interval and transmitting the second indication occurs within a common region of a second escalation interval.
[0203] According to one aspect of the first example, the method further comprises configuring the size of the first indication based on a size of the transmission resource allocated for transmission to the UE in the first escalation interval.
[0204] According to one aspect of the first example, transmitting the first indication and the second indication comprises transmitting the first indication and the second indication in a downlink control indication (DCI) message in a staggering interval subsequent to the first interval scheduling.
[0205] According to one aspect of the first example, transmitting the first indication comprises transmitting a single bit in a specific part of the DCI UE, the single bit indicating that a UE should monitor a common DCI region for additional information regarding at least minus one of the location of the traffic portion that was acquired by preemption and a location of the supplementary transmission.
[0206] According to one aspect of the first example, transmitting the first indication and the second indication comprises transmitting the first indication and the second indication in one or more escalation intervals subsequent to the first interval.
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90/91 [0207] According to one aspect of the first example, transmitting the first indication comprises transmitting the first indication on a group common downlink control channel, the group common downlink control channel comprising a field for each piece of traffic that was acquired by preemption for a maximum number of preemption events.
[0208] According to one aspect of the first example, each piece of traffic that was acquired by preemption is identified using a preemption event identifier.
[0209] According to one aspect of the first example, each field indicates a location for each part of traffic that was acquired by preemption.
[0210] According to one aspect of the first example, transmitting the second indication comprises transmitting the second indication on a group common downlink control channel, the group common downlink control channel comprising a field for each UE of a set of UEs to be notified of a portion of traffic that has been acquired by preemption.
[0211] According to an aspect of the first example, the method further comprises configuring a size of each field based on a size of granularity of allocated resources staggered for the respective UE.
[0212] According to one aspect of the first example, transmitting the first and second indications is performed on a downlink control indication (DCI) message.
[0213] According to a second example, a method is provided to notify a UE of preemption of a part of
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91/91 traffic in a first escalation interval, the method
comprising: to transmit an first recommendation what notifies the UE of what traffic for the UE is staggered for transmission in a region in coexistence of the first
escalation interval in which more than one type of traffic can be transmitted; and transmit a second indication to the UE notifying the UE that at least part of the traffic has been acquired by preemption.
[0214] According to one aspect of the second example, the first statement instructs the UE to change a pre-configured HARQ feedback moment that defines when HARQ feedback is sent by the UE.
[0215] According to one aspect of the second example, transmitting the second indication occurs within the first escalation interval.
[0216] According to one aspect of the second example, transmitting the second indication occurs in a second escalation interval subsequent to the first interval.
[0217] Although this invention 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 modalities of the invention, will be apparent to those skilled in the art upon reference to the description. Therefore, the appended claims are considered to cover any such modifications or modalities.

权利要求:
Claims (4)
[1]
AMENDED CLAIMS
1. Method for notifying a UE of preemption of a portion of traffic in a first interval, the method characterized by the fact that it comprises:
shuffle at least part of an indication of the preemption of the traffic portion in the first interval using a temporary radio network identifier (RNTI); and transmit the indication, including the scrambled part,
to EU in a Message from control information in link downward (DCI) in a physical control channel in link downward (PDCCH).2 . Method, according with claim 1,
characterized by the fact that the indication additionally comprises an identification of a location of the part of traffic that was acquired by preemption in the first interval.
3. Method, according to claim 1 or 2, characterized by the fact that it additionally comprises transmitting the RNTI to the UE which is used to scramble at least part of the indication.
Method according to any one of claims 1 to 3, characterized in that it additionally comprises transmitting an indication of granularity of a time-frequency resource.
5. Method, according to claim 4, characterized by the fact that transmitting a granularity indication of a time-frequency resource comprises transmitting the granularity indication by means of higher layer signaling.
6. Method, according to any of the
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[2]
2/4 claims 1 to 5, characterized by the fact that transmitting the indication comprises transmitting the indication in the first interval.
Method according to any one of claims 1 to 6, characterized in that transmitting the indication comprises transmitting the indication in a second interval subsequent to the first interval.
8. Method, according to claim 7, characterized by the fact that transmitting the indication comprises transmitting an indication that no transmission to the UE is present in a temperature-frequency resource corresponding to the part of traffic indicated to be acquired by preemption in the first interval.
9. Method, according to claim 8, characterized by the fact that the temperature frequency resource is one or more of:
fur one less symbol; andfur one less resource block.10. Method, according Any of them of claims 1 to 9, characterized by the fact that what
transmitting the indication comprises transmitting the indication in a common group control region.
11. Method according to any one of claims 1 to 10, characterized in that when a carrier has more than one part of active bandwidth, it transmits an indication for each part of active bandwidth.
12. Method, according to claim 11, characterized by the fact that a size of a transmission resource used to transmit the indications for each
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[3]
3/4 part of active bandwidth contains xy bits, where x defines a number of elements in the time domain distinct from a particular granularity and y defines a number of resources in the time domain distinct from a particular granularity in the first scaling interval.
13. Method for notifying a UE of preemption of a portion of traffic in a first interval, the method characterized by the fact that it comprises:
receiving on a physical downlink control channel (PDCCH) a downlink control (DCI) message containing an indication, in which at least one part is scrambled, that the traffic part was acquired by preemption in the first interval;
use a temporary radio network identifier (RNTI) to decode the scrambled part of the indication that the traffic part was acquired by preemption in the first interval.
14. Device, characterized by the fact that it comprises:
at least one antenna;
a processor;
a computer-readable medium having executable instructions per processor stored therein that, when executed by the processor, induce the apparatus to perform the method according to any one of claims 1 to 12.
15. Device, characterized by the fact that it comprises:
at least one antenna;
a processor;
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[4]
4/4 a computer-readable medium having executable instructions per processor stored in it that, when executed by the processor, induce the device to:
receiving on a physical downlink control channel (PDCCH) a downlink control (DCI) message containing an indication, in which at least one part is scrambled, that the traffic part was acquired by preemption in the first interval;
use a temporary radio network identifier (RNTI) to decode the scrambled part of the indication that the traffic part was acquired by preemption in the first interval.

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公开号 | 公开日

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EP3583810A4|2020-03-04|

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WO2018171532A1|2018-09-27|

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CN110192413A|2019-08-30|

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JP2020511878A|2020-04-16|

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CN110192413B|2021-08-27|

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