METHOD FOR TRANSMITTING AND RECEIVING UPWARD LINK IN WIRELESS COMMUNICATION SYSTEM AND APPLIANCE FOR

专利摘要:
the present invention relates to a method for transmitting and receiving an uplink in a wireless communication system and an apparatus for it. specifically, a method for transmitting uplink via user equipment (eu) in a wireless communication system may include: receiving configuration information from a base station; polling reference signal (srs), where the srs configuration information includes a set of parameters for power control of srs for each set of srs resources and the set of srs resources includes one or more srs resources; determine a srs transmission power, based on the set of parameters for srs power control; and transmit the srs to the base station.
公开号:BR112019015603A2
申请号:R112019015603-8
申请日:2018-05-04
公开日:2020-03-17
发明作者:Park Jonghyun；Kang Jiwon；Kim Kijun；Seo Hanbyul；Ahn Joonkui
申请人:Lg Electronics Inc.；
IPC主号:

专利说明:

“METHOD FOR TRANSMITTING AND RECEIVING UPWARD LINK IN WIRELESS COMMUNICATION SYSTEM AND APPLIANCE FOR THE SAME”
TECHNICAL FIELD [001] The present invention relates to a wireless communication system and, more particularly, to a method for uplink transmission / reception and transmission power control and to an apparatus to support it.
BACKGROUND OF THE TECHNIQUE [002] Mobile communication systems were developed to provide voice services, while ensuring user activity. Service coverage for mobile communication systems, however, has been extended even to data services, as well as voice services, and today, an explosive increase in traffic has resulted in a shortage of demand for resources and users for high-speed services, that require advanced mobile communication systems.
[003] The requirements of the next generation mobile communication system may include support for large data traffic systems, a considerable increase in the throughput of each user, the accommodation of a significantly increased number of connection devices, end latency the very low end and high energy efficiency. For this purpose, several techniques, such as small cell enhancement, dual connectivity, Multiple Multiple Inputs in Mass (MIMO), total in-band duplexing, non-orthogonal multiple access (NOMA), support for super wide band and device network, surveyed.
REVELATION
PROBLEM OF THE TECHNIQUE [004] An objective of the present invention is to propose a method for
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2/100 transmit / receive a signal (eg, SRS) / uplink channel (eg, physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH), in particular, a control of transmission power of an uplink signal / channel.
[005] Furthermore, the objective of the present invention is to propose a method of controlling uplink power for multiple sounding reference signals (SRS).
[006] The objectives of the technique of the present invention are not limited to the objectives of the technique mentioned above, and other objectives of the technique, which are not mentioned above, will of course be understood by a person who has common skill in the technique from the following description.
TECHNICAL SOLUTION [007] In one aspect of the present invention, a method for transmitting uplink via User Equipment (UE) in a wireless communication system may include: receiving information from a base station configuration of the Sounding Reference Signal (SRS), where the SRS configuration information includes a set of parameters for SRS power control for each set of SRS resources and the set of SRS resources includes one or more SRS resources; determine an SRS transmission power, based on the set of parameters for SRS power control; and transmit the SRS to the base station.
[008] In another aspect of the present invention, a user equipment (UE) that performs uplink transmission in a wireless communication system can include: a transceiver for transmitting and receiving a radio signal; and a processor to control the transceiver, where the processor can be configured to receive, from a base station, configuration information from the Reference Sounding Signal (SRS), where the information
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3/100 SRS configuration includes a set of parameters for SRS power control for each set of SRS features and the set of SRS features includes one or more SRS features; determine an SRS transmission power, based on the set of parameters for SRS power control; and transmit the SRS to the base station.
[009] Preferably, the transmission power of the SRS can be determined, based on a downlink path loss estimate value calculated by the UE using a downlink reference signal indicated by the set of parameters for the SRS power control.
[010] Preferably, the downlink reference signal may include the Synchronization Signal Block (SSB) and the Channel State Information Reference Signal (CSI-RS).
[011] Preferably, the downlink reference signal is changed by a Media Access Control Element (MAC-CE) transmitted by the base station.
[012] Preferably, the SRS transmission power can be determined by applying a Transmission Power Control (TPC) accumulation commonly to the SRS feature set.
[013] Preferably, a power control setting to adjust the SRS transmission power is applied independently for each specific SRS transmission interval.
[014] Preferably, when the power control setting is triggered, all SRS transmit power values can be adjusted identically on all SRS resources, regardless of the SRS transmit power that is determined.
[015] Preferably, when the adjusted transmission power value
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4/100 exceeds a predetermined value, the adjusted transmission power value can be reduced collectively.
[016] Preferably, the method may additionally include: receiving, from the base station, downlink control (DCI) information that includes Physical Uplink Shared Channel (PUSCH) programming information, in which the DCI include an SRS Resource Indicator (SRI); determine a PUSCH transmission power based on a set of parameters for PUSCH power control determined from the SRI; and transmit the PUSCH to the base station.
[017] Preferably, when a plurality of SRS resources are indicated by the SRI and a group of layers is configured differently for each of the plurality of SRS resources, a set of parameters for PUSCH power control can be determined respectively for each layer group.
[018] Preferably, the transmission power of the PUSCH can be determined, based on a downlink path loss estimate value calculated by the UE using a downlink reference signal indicated by the set of parameters for the PUSCH power control.
[019] Preferably, the downlink reference signal can be changed by a Media Access Control Element (MAC-CE) transmitted by the base station.
[020] Preferably, the method may additionally include: determining a transmission power of the Physical Uplink Shared Channel (PUSCH) based on a downlink path loss estimate value calculated by the UE using a signal downlink reference reference; and transmit the PUSCH to the base station, where when the
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5/100 information for the downlink reference signal is not provided by the base station, the path loss estimate value can be calculated using a downlink reference signal that has a relatively higher power level .
ADVANTAGEOUS EFFECTS [021] According to an embodiment of the present invention, a transmission power can be efficiently controlled when an uplink signal / channel is transmitted.
[022] In addition, according to an embodiment of the present invention, the transmission power can be efficiently controlled when the uplink signal / channel is transmitted in a situation where a plurality of SRS resources are configured.
[023] The advantages that can be obtained in the present invention are not limited to the effects mentioned above and other advantages not mentioned will be clearly understood by those who are skilled in the art from the following description.
DESCRIPTION OF THE DRAWINGS [024] The accompanying drawings, which are included in the present invention as part of the description to aid in the understanding of the present invention, provide embodiments of the present invention, and describe the technical features of the present invention with the description below.
[025] Figure 1 illustrates the structure of a radio frame in a wireless communication system to which the present invention can be applied.
[026] Figure 2 is a diagram illustrating a resource grid for a downlink partition in a wireless communication system to which the present invention can be applied.
[027] Figure 3 illustrates a downlink subframe structure
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6/100 in a wireless communication system to which the present invention can be applied.
[028] Figure 4 illustrates an uplink subframe structure in a wireless communication system to which the present invention can be applied.
[029] Figure 5 illustrates the configuration of a known MIMO communication system.
[030] Figure 6 is a diagram showing a channel from a plurality of transmitting antennas to a single receiving antenna.
[031] Figure 7 illustrates reference signal patterns mapped to downlink resource block pairs in a wireless communication system to which the present invention can be applied.
[032] Figure 8 is a diagram illustrating features to which the reference signals are mapped in a wireless communication system to which the present invention can be applied.
[033] Figure 9 illustrates an uplink subframe that includes a poll reference signal symbol in a wireless communication system to which the present invention can be applied.
[034] Figure 10 is a diagram illustrating a self-sufficient subframe structure in the wireless communication system to which the present invention can be applied.
[035] Figure 11 illustrates a model of transceiver unit in the wireless communication system to which the present invention can be applied.
[036] Figure 12 is a diagram illustrating a service area for each transceiver unit in the wireless communication system to which the present invention can be applied.
[037] Figure 13 is a diagram illustrating a method for transmitting and
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7/100 receiving an uplink, according to an embodiment of the present invention.
[038] Figure 14 is a block diagram of a wireless communication device, according to one embodiment of the present disclosure.
MODE FOR THE INVENTION [039] Some embodiments of the present invention are described in detail with reference to the accompanying drawings. A detailed description to be disclosed in conjunction with the accompanying drawings is intended to describe some embodiments of the present invention and is not intended to describe a single embodiment of the present invention. The following detailed description includes more details in order to provide a complete understanding of the present invention. However, those skilled in the art will understand that the present invention can be implemented without further details.
[040] In some cases, in order to prevent the concept of the present invention from becoming vague, known structures and devices are omitted or can be shown in a block diagram form based on the main functions of each structure and device [041 ] In this specification, a base station has the meaning of a terminal node in a network through which the base station communicates directly with a device. In this document, a specific operation that is described to be performed by a base station can be performed by an upper node of the base station, depending on the circumstances. That is, it is evident that in a network that includes a plurality of network nodes that includes a base station, several operations performed for communication with a device can be performed by the base station or other network nodes in addition to the base station. The base station (BS) can be replaced by another term, such as a fixed station, a Node B, an eNB (Evolved Node B), a Transceiver-Base System (BTS) or an access point (AP).
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8/100
In addition, the device can be fixed or mobile and can be replaced by another term, such as User Equipment (UE), a Mobile Station (MS), a User Terminal (UT), a Mobile Subscriber Station ( MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), a Wireless Terminal (WT), a Machine Type Communication Device (MTC), a Machine to Machine Device (M2M) or a Device Device a Device (D2D).
[042] Hereinafter, downlink (DL) means communication from an eNB to UE, and uplink (UL) means communication from UE to an eNB. In the DL, a transmitter can be part of an eNB, and a receiver can be part of the UE. In UL, a transmitter can be part of the UE, and a receiver can be part of an eNB.
[043] The specific terms used in the description below have been provided to assist in the understanding of the present invention, and the use of such specific terms can be changed in a number of ways without departing from the spirit of the technique of the present invention.
[044] The following technologies can be used in a variety of wireless communication systems, such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA) , Multiple Access by Orthogonal Frequency Division (OFDMA), Multiple Access by Single Carrier Frequency Division (SCFDMA) and Non-Orthogonal Multiple Access (NOMA). CDMA can be implemented using radio technology, such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented using radio technology, such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Advanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented using radio technology, such as Institute of Electrical and Electronic Engineers (IEEE) 802.11 (Wi-Fi), IEEE
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9/100
802.16 (WiMAX), IEEE 802.20 or Evolved UTRA (E-UTRA). UTRA is part of a Universal Mobile Telecommunications System (UMTS). The Long Term Evolution (LTE) from 3 ^to Partnership Project generation (3GPP) is part of urn UMTS Evolved (E-UMTS) using UMTS Terrestrial Radio Access evolved (EUTRA) and adopts OFDMA for downlink and adopts SC-FDMA in uplink. Advanced LTE (LTE-A) is an evolution of LTE 3GPP.
[045] The modalities of the present invention can be supported by the standard documents disclosed in at least one among IEEE 802, 3GPP, and 3GPP2, that is, radio access systems. That is, the steps or portions that belong to the modalities of the present invention and that are not described in order to clearly state the spirit of the technique of the present invention can be supported by the documents. In addition, all terms disclosed in this document can be described by standard documents.
[046] In order to further clarify the description, 3GPP LTE / LTE-A or new RAT (RAT 5G system (generation 5)) is mainly described, but the technical features of the present invention is not limited to this.
General system to which the present invention can be applied [047] Figure 1 shows the structure of a radio frame in a wireless communication system to which a modality of the present invention can be applied.
[048] 3GPP LTE / LTE-A supports a type 1 radio frame structure that may be applicable to Frequency Division Duplexing (FDD) and a radio frame structure that may be applicable to Time Division Duplexing (TDD) ).
[049] The size of a radio frame in the time domain is represented as a multiple of a time unit of T_s = 1 / (15000 * 2048). A UL and DL transmission includes the radio frame that has a duration of T_f =
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10/100
307200 * T_s = 10 ms.
[050] Figure 1 (a) exemplifies a type 1 radio frame structure. Tipo type 1 radio frame can be applied to both FDD full duplex and FDD half duplex duplexing.
[051] A radio frame includes 10 subframes. A radio frame includes 20 partitions of T_slot = 15360 * T_s = 0.5 ms in length, and 0 to 19 indexes are provided for each of the partitions. A subframe includes two consecutive partitions in the time domain, and subframe i includes partition 2i and partition 2i + 1. The time required to transmit a subframe is called a transmission time interval (TTI). For example, the length of subframe i can be 1 ms and the length of a partition can be 0.5 ms.
[052] A UL transmission and a DL I transmission from the FDD are distinguished in the frequency domain. Considering that there is no restriction on the FDD full duplex, a UE may not transmit and receive simultaneously in the FDD half duplex operation.
[053] A partition includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and includes a plurality of Resource Blocks (RBs) in a frequency domain. In LTE 3GPP, OFDM symbols are used to represent a symbol period because OFDMA is used in downlink. An OFDM symbol can be called an SC-FDMA symbol or symbol period. An RB is a resource allocation unit that includes a plurality of contiguous subcarriers in a partition.
[054] Figure 1 (b) shows type 2 frame structure.
[055] A type 2 radio frame includes two 153600 half frames * T_s = 5 ms in length, each. Each half frame includes 5 subframes of 30720 * T_s = 1 ms in length.
[056] In the type 2 frame structure of a TDD system, a configuration of
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11/100 uplink-downlink is a rule that indicates whether the uplink and downlink are allocated (or reserved) for all subframes.
[057] Table 1 shows the uplink-downlink configuration.
TABLE 1
Uplink configuration downlink Frequency of downlink to uplink switching point Subframe number 0 1 2 3 4 5 6 7 8 9 0 5 ms D s U U U D s U U U 1 5 ms D s U U D D s U U D 2 5 ms D s U D D D s u D D 3 10 ms D s U U U D D D D D 4 10 ms D s U U D D D D D D 5 10 ms D s U D D D D D D D 6 5 ms D s U U U D s U U D
[058] With reference to Table 1, in each radio frame subframe, 'D' represents a subframe for a DL transmission, 'LT represents a subframe for UL transmission, and' S 'represents a special subframe that includes three types of fields that include a Downlink Pilot Time Partition (DwPTS), a Guard Period (GP) and an Uplink Pilot Time Partition (UpPTS).
[059] A DwPTS is used for initial cell search, synchronization or channel estimation in a UE. An UpPTS is used to estimate channel in an eNB and to synchronize a UL transmission synchronization from a UE. A GP is the duration to remove interference that occurs at a UL due to the multipath delay of a DL signal between a UL and a DL.
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12/100 [060] Each subframe i includes partition 2i and partition 2i + 1 of T_slot = 15360 * T_s = 0.5 ms.
[061] The UL-DL configuration can be classified into 7 types, and the position and / or the number of a DL subframe, a special subframe and a UL subframe are different for each configuration.
[062] A time point at which a change is made from downlink to uplink or a time point at which a change is made from uplink to downlink is called a switching point. The periodicity of the switching point means a cycle in which an uplink subframe and a downlink subframe are changed is repeated in the same way Both 5 ms and 10 ms are supported in the periodicity of a switching point. If the periodicity of a switching point has a cycle of a 5 ms downlink-uplink switching point, the special subframe S is present in each half frame. If the periodicity of a switching point has a 5 ms downlink-uplink switching point cycle, the special subframe S is present in the first half frame only.
[063] In all configurations, 0 and 5 subframes and a DwPTS are used only for downlink transmission. An UpPTS and a subframe subsequent to a subframe are always used for uplink transmission.
[064] Such uplink-downlink configurations can be provided for either an eNB such as the UE or system information. An eNB can notify the UE of a change in the uplink-downlink allocation status of a radio frame by transmitting only the uplink-downlink configuration information index to the UE whenever the configuration information of uplink
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13/100 downlink are changed. In addition, configuration information is a type of downlink control information and can be transmitted through a Physical Downlink Control Channel (PDCCH) like other programming information. The configuration information can be transmitted to all UEs within a cell via a broadcast channel as broadcast information.
[065] Table 2 represents the configuration (length of
DwPTS / GP / UpPTS) of a special subframe.
TABLE 2
Special subframe configuration Normal cyclic prefix in link Link extended cyclic prefix DwPTS downward DwPTS downward UpPTS Normal cyclic prefix in ascending link and Cyclic prefix extended on uplink UpPTSNormal cyclic prefix on uplink Cyclic prefix extended on uplink 0 6592 T _s7680 · _s1 19760-7 _s20480-7. 2192-7 _S 2560-7 _S 2 21952-7 _S 2192 T _s 2560 r _s 23040-7 _S 3 24144-Tj 25600-7 _S4 26336-7 _S7680 · 7 _S5 6592-7 _S20480-7 _S 4384-7 _S 5120-7 _S 6 19760-7 _s 4384-7 _S 5120-7) 23040-7. 7 21952-Tj - - - 8 24144-Tj - - -
[066] The structure of a radio subframe, according to the example in Figure 1 is just an example, and the number of subcarriers included in a radio frame, the number of partitions included in a subframe and the number of OFDM symbols included in a partition can be changed in several ways.
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14/100 [067] Figure 2 is a diagram that illustrates a resource grid for a downlink partition in a wireless communication system to which a modality of the present invention can be applied.
[068] With reference to Figure 2, a downlink partition includes a plurality of OFDM symbols in a time domain. It is described in the present document that a downlink partition includes 7 OFDMA symbols and a resource block includes 12 subcarriers for exemplary purposes only, and the present invention is not limited to that.
[069] Each element in the resource grid is called a resource element, and a resource block (RB) includes 12x7 resource elements. The number of N ^A DL RBs included in a downlink partition depends on a downlink transmission bandwidth.
[070] The structure of an uplink partition can be the same as that of a downlink partition.
[071] Figure 3 shows the structure of a downlink subframe in a wireless communication system to which a modality of the present invention can be applied.
[072] With reference to Figure 3, a maximum of three OFDM symbols located in a front portion of a first partition of a subframe corresponds to a control region in which control channels are allocated, and the remaining OFDM symbols correspond to a region data on which a physical downlink shared channel (PDSCH) is allocated. The downlink control channels used in LTE 3GPP include, for example, a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH) and a physical hybrid ARQ indicator channel (PHICH) .
[073] A PCFICH is transmitted in the first OFDM symbol of a subframe
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15/100 and carries information about the number of OFDM symbols (ie, the size of a control region) that are used to transmit control channels within the subframe. A PHICH is a response channel for uplink and carries a confirmation signal (ACK) / negative confirmation (NACK) for a Hybrid Automatic Repeat Request (HARQ). The control information transmitted in a PDCCH is called Downlink Control Information (DCI). DCIs include uplink resource allocation information, downlink resource allocation information, or an uplink transmit (Tx) power control command for a specific group of UEs.
[074] A PDCCH can carry information about resource allocation and transport format of a downlink shared channel (DL-SCH) (also called “downlink grant”), resource allocation information about a uplink shared channel (UL-SCH) (also called “uplink grant”), paging information about a PCH, system information about a DL-SCH, the allocation of a control message resource upper layer, such as random access response transmitted in a PDSCH, a set of transmit power control commands for the individual UE within the specific group of UEs, and the activation of a Voice over Internet Protocol (VoIP), etc. A plurality of PDCCHs can be transmitted within the control region, and the UE can monitor a plurality of PDCCHs. A PDCCH is transmitted on a single Control Channel Element (CCE) or an aggregation of some contiguous CCEs. A CCE is a logical allocation unit that is used to provide a PDCCH with an encoding rate according to the state of a radio channel. A CCE corresponds to a plurality of groups of resource elements. The format of a PDCCH and the number of available bits of a PDCCH are determined by a ratio of
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16/100 association between the number of CCEs and an encoding rate provided by the CCEs.
[075] An eNB determines the format of a PDCCH based on the DCIs to be transmitted to the UE and attaches a Cyclic Redundancy Check (CRC) to the control information. A unique identifier (a Temporary Radio Network Identifier (RNTI)) is masked for the CRC depending on the owner or use of a PDCCH. If the PDCCH is a PDCCH for the specific UE, a unique identifier for the UE, for example, a Cell RNTI (C-RNTI) can be masked for the CRC. If the PDCCH is a PDCCH for a paging message, a paging indication identifier, for example, a Paging RNTI (P-RNTI) can be masked for the CRC. If the PDCCH is a PDCCH for system information, more specifically, a System Information Block (SIB), a system information identifier, for example, a System Information RNTI (SI-RNTI) can be masked for the CRC. A Random Access RNTI (RA-RNTI) can be masked for the CRC to indicate a random access response which is a response to the transmission of a random access preamble by the UE.
[076] Figure 4 shows the structure of an uplink subframe in a wireless communication system to which a modality of the present invention can be applied.
[077] With reference to Figure 4, an uplink subframe can be divided into a control region and a data region in the frequency domain. A physical uplink control channel (PUCCH) that carries uplink control information is allocated in the control region. A shared physical uplink (PUSCH) channel carrying user data is allocated in the data region. In order to maintain the unique carrier characteristic, an UE does not send a PUCCH and a PUSCH at the same time.
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17/100 [078] A pair of Resource Blocks (RB) is allocated in a PUCCH to a UE within a subframe. The RBs that belong to a pair of RBs occupy different subcarriers in each of the 2 partitions. This is called that a pair of RBs allocated in a PUCCH is skipped by frequency at a partition boundary.
Multiple inputs multiple outputs (MIMO) [079] A MIMO technology does not use single transmit antenna and single receive antenna that have been commonly used until now, but uses a multiple transmit antenna (Tx) and a multiple receive antenna (Rx ). In other words, MIMO technology is a technology to increase capacity or improve performance with the use of multiple input / multiple output antennas at the transmitting or receiving end of a wireless communication system. Henceforth, MIMO is called a “multiple input / multiple output antenna”.
[080] More specifically, the multiple input / multiple output antenna technology does not depend on a single antenna path in order to receive a single total message and complete the total data by collecting a plurality of data received through multiple antennas. As a result, multiple input / multiple output antenna technology can increase a data transfer rate within a specific system range and can also increase a system range through a specific data transfer rate.
[081] An efficient multiple input / multiple output antenna technology is expected to be used because next generation mobile communication requires a much higher data transfer rate than that of existing mobile communication. In such a situation, MIMO communication technology is a next generation mobile communication technology
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18/100 that can be widely used in the mobile communication UE and a retransmission node and have been highlighted as a technology that can overcome a limit on the transfer rate of another mobile communication attributable to the expansion of data communication.
[082] However, the multiple input / multiple output antenna (MIMO) technology of various transmission efficiency enhancement technologies that are being developed was more prominent as a method with the capacity to significantly improve communication capacity and performance. transmission / reception even without the allocation of additional frequencies or an increase in power.
[083] Figure 5 shows the configuration of a known MIMO communication system.
[084] With reference to Figure 5, if the number of transmit antennas (Tx) is increased to N_T and the number of receive antennas (Rx) is increased to N_R at the same time, a theoretical channel transmission capacity is increased proportionally the number of antennas, unlike the case where a plurality of antennas is used only on a transmitter or receiver. Consequently, a throughput can be improved, and the frequency efficiency can be significantly improved. In that case, a transfer rate according to an increase in channel transmission capacity can theoretically be increased by a value obtained by multiplying the following rate increase R_i by a maximum transfer rate R_o if an antenna is used.
EQUATION 1
THE. = min (/ V _r , / Vj [085] That is, a MIMO communication system that uses 4 transmitting antennas and 4 receiving antennas, for example, a transfer rate
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19/100 quadruple can theoretically be obtained compared to a single antenna system.
[086] Such multi-input / multiple-output antenna technology can be divided into a spatial diversity method to increase transmission reliability with the use of symbols that pass through multiple channel paths and a spatial multiplexing method to enhance a transfer rate by sending a plurality of symbols at the same time using a plurality of transmission antennas. In addition, active research is recently being carried out on one method to properly take advantage of the two methods by combining the two methods.
[087] Each method is described in more detail below.
[088] First, the spatial diversity method includes a space-time code series method and a space-time Trelis code series method using a diversity gain and a coding gain at the same time. In general, the Trelis code series method is better in terms of bit error rate enhancement performance and the degree of code generation freedom, whereas the space-time block series method has low operational complexity. Such gain in spatial diversity can correspond to an amount that corresponds to the product (N_T x N_R) of the number of transmitting antennas (N_T) and the number of receiving antennas (N_R).
[089] Second, the spatial multiplexing scheme is a method for sending different data streams across transmission antennas. In this case, at a receiver, mutual interference is generated between the data transmitted by a transmitter at the same time. The receiver removes interference using an appropriate signal processing scheme and receives the data. A noise removal method used in this case may include a Sound Detection receiver
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Maximum Likelihood (MLD), a Zero-Forcing (ZF) receiver, a Minimum Minimum Square Error (MMSE) receiver, Diagonal-Bell Laboratories Layered Space-Time - D-BLAST , Vertical in Space-Time Layers of Bell Laboratories (Vertical-Bell Laboratories Layered Space-Time - V-BLAST). In particular, if a transmission end can be aware of the channel information, a Decomposition into Singular Values (SVD) method can be used.
[090] Third, there is a method of using a combination of spatial diversity and spatial multiplexing. If only a spatial diversity gain is obtained, a performance improvement gain according to an increase in the diversity gap is gradually saturated. If only a spatial multiplexing gain is used, the transmission reliability on a radio channel is deteriorated. The methods to solve the problems and obtain the two researched gains can include a method of double diversity of space-time transmission (double STTD) and a coded modulation interspersed by space-time bit (STBICM).
[091] In order to describe a communication method in a multiple input / multiple output antenna system, such as the one described above, in more detail, the communication method can be represented as follows through a mathematical model.
[092] First, as shown in Figure 5, it is assumed that the N_T transmitting antennas and the NR receiving antennas are present.
[093] First, a transmission signal is described below. If the N_T transmission antennas are present, as described above, a maximum number of information that can be transmitted is N_T, which can be represented using the following vector.
EQUATION 2
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5i, 5 ₂ , '' ^Y N _T.
[094] However, the transmission power may be different in each of the transmission information s_1, s_2, s_NT. In this case, if the transmission power information is P_1, P_2, P_NT, the transmission information that has controlled transmission power can be represented using the following vector.
EQUATION 3 s - [sj, s ₂ , · · ·, s _Nt - [fjSj, P ₂ s ₂ , · · ·, P _Nt s _Nt [095] In addition, the transmission information that has transmission power controlled in Equation 3 can be represented as follows using the diagonal matrix P of the transmission power.
EQUATION 4 [096] However, the vector of information that has transmission power controlled in Equation 4 is multiplied by a weight matrix W, thus forming transmission signals N_T x_1, x_2, ..., x_NT that are actually transmitted. In this case, the weight matrix works to properly distribute the transmission information to antennas according to a transport channel condition. The following can be represented using the transmission signals x_1, x_2, ..., x_NT.
EQUATION 5
MU · - x ₂ ^M 22 · - ^W 2N _TX =- = Ws = WPs U-2 · - ^W iN _T -¼. ^W N _T ! ^W N _T 2 · ^W N _T N _T _ Jn _t _
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22/100 [097] In this case, w_ij indicates the weight between an i-th transmission antenna and a j-th transmission information, and W is an expression of a weight matrix, such a matrix W is called a matrix of weight. weight or pre-coding matrix.
[098] However, the transmission signal x, such as the one described above, can be considered to be used in a case where a spatial diversity is used and a case where a spatial multiplexing is used.
[099] If spatial multiplexing is used, all elements of the information vector s have different values because different signals are multiplexed and transmitted. In contrast, if spatial diversity is used, all elements of the information vector s have the same value because the same signals are transmitted across multiple channel paths.
[0100] A method for mixing spatial multiplexing and spatial diversity can be considered. In other words, the same signals can be transmitted using spatial diversity through 3 transmission antennas, for example, and the remaining different signals can be spatially multiplexed and transmitted.
[0101] If the receiving antennas N_R are present, the receiving signals y_1, y_2, ..., y_NR of the respective antennas are represented as follows using a vector y.
EQUATION 6 [0102] However, if channels in a multiple input / multiple output antenna communication system are modeled, the channels can be classified according to the transmit / receive antenna indices. A channel that passes through a receiving antenna i from a transmitting antenna j is represented as h_ij. In this case, it should be noted that in the order of
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23/100 h_ij index, the index of a receiving antenna comes first and the index of a transmitting antenna then comes later.
[0103] Several channels can be grouped and expressed in a vector and matrix form. For example, a vector expression is described below.
[0104] Figure 6 is a diagram showing a channel from a plurality of transmitting antennas to a single receiving antenna.
[0105] As shown in Figure 6, a channel from a total of transmit antennas N_T to a receive antenna i can be represented as follows.
EQUATION 7
[0106] Furthermore, if all channels from the transmitting antenna N_T to the receiving antennas NR are represented using a matrix expression, such as Equation 7, they can be represented as follows.
EQUATION 8
H =
X ΊAl ^ 2 - ^h lN _T hl ^ 22 h-lN-r h, ^T ₌ ^h n ^ 2 - ^h iN _T Xd ^h N _R l X2 ^ N _R N _T _
[0107] However, White Additive Gaussian Noise (AWGN) is added to a real channel after the real channel experiences the H channel matrix. Consequently, AWGN n_1, n_2, ..., n_NR added to the N_R receiving antennas, respectively , is represented using a vector as follows.
EQUATION 9 [0108] A transmit signal, a receive signal, a channel, and AWGN in a multiple input / multiple output antenna communication system
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24/100 can be represented to have the following relationship by modeling the transmit signal, receive signal, channel, and AWGN, such as those described above.
EQUATION 10J1Ai ay ₂ Ai h ₂ y == Hey ^h i
[0109] However, the number of rows and columns of the H channel matrix indicative of the status of the channels is determined by the number of transmit / receive antennas. In the H channel matrix, as described above, the number of rows becomes equal to the number of receiving antennas N_R, and the number of columns becomes equal to the number of transmitting antennas N_T. That is, the H channel matrix becomes an N_RxN_T matrix.
[0110] In general, the classification of a matrix is defined as a minimum number of the number of independent rows or columns. Consequently, the rank of the matrix is not greater than the number of rows or columns. As for the figurative style, for example, the H classification of the H channel matrix is limited as follows.
EQUATION 11 rank (H) <min (N _T , N _R ) [0111] Furthermore, if a matrix is subjected to eigenvalue decomposition, a classification can be defined as the number of eigenvalues that belong to eigenvalues and that are not 0. Likewise, if a classification is submitted to Classification in Singular Values (SVD), it can be defined as the number of singular values other than 0. Consequently, it can be said that the physical meaning of a classification in a channel matrix is
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25/100 a maximum number at which different information can be transmitted on a given channel.
[0112] In this specification, a “classification” for MIMO transmission indicates the number of paths through which signals can be independently transmitted at a specific time point and a specific frequency resource. The “number of layers” indicates the number of signal streams transmitted through each path. In general, a classification has the same meaning as the number of layers, except where otherwise described, because a transmission end sends the number of layers that corresponds to the number of classifications used in signal transmission.
Reference signal (RS) [0113] In a wireless communication system, a signal can be distorted during transmission because the data is transmitted over a radio channel. In order for a receiving end to receive precisely a distorted signal, the distortion of a received signal needs to be corrected with the use of channel information. In order to detect channel information, a method for detecting channel information using the degree of distortion of a signal transmission method and a signal known to both the transmitting and receiving sides when they are transmitted over a channel is mainly used. The previously mentioned signal is called a pilot signal or reference signal (RS).
[0114] Even more recently, when most mobile communication systems transmit a packet, they use a method capable of improving the efficiency of transmit / receive data by adopting multiple transmit antennas and multiple receive antennas instead of use a transmitting antenna and a receiving antenna that have been used so far. When data is transmitted and received using multiple antennae
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26/100 inputs / outputs, a channel state between the transmitting antenna and the receiving antenna needs to be detected in order to receive the signal precisely. Consequently, each transmission antenna must have an individual reference signal.
[0115] In a mobile communication system, an RS can basically be divided into two types depending on its purpose. There is an RS that has an objective to obtain channel state information and an RS used for data demodulation. The former has an objective of obtaining, through a UE, to obtain channel status information on the downlink. Consequently, a corresponding RS must be transmitted over broadband, and a UE must be able to receive and measure the RS although the UE does not receive downlink data in a specific subframe. In addition, the former is also used for measurement of radio resource management (RRM), such as automatic switching. The latter is an RS transmitted along with the corresponding resources when an eNB transmits the downlink. A UE can perform channel estimation when receiving a corresponding RS, and thus can demodulate data. The corresponding RS needs to be transmitted in a region where the data is transmitted.
[0116] A downlink RS includes a common RS (CRS) for acquiring information about a channel state shared by all UEs within a cell and measurement, such as automatic switching, and a dedicated RS (DRS) used for demodulation of data for only one specific UE. Information for demodulation and channel measurement can be provided using such RSs. That is, DRS is used only for data demodulation, and CRS is used for both purposes of channel information acquisition and data demodulation.
[0117] The receiving side (ie UE) measures a channel state based on
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27/100 in a CRS and feeds a channel quality related indicator, such as a channel quality indicator (CQI), a pre-coding matrix index (PMI) and / or a rating indicator (RI), back to the transmission side (ie an eNB). CRS is also called a cell-specific RS. In contrast, a reference signal related to the feedback of channel state information (CSI) can be defined as a CSI-RS.
[0118] DRS can be transmitted via resource elements if data on a PDSCH needs to be demodulated. A UE can receive information about whether a DRS is present through an upper layer, and the DRS is only valid if a corresponding PDSCH has been mapped. DRS can also be called an EU-specific RS or demodulation RS (DMRS).
[0119] Figure 7 illustrates reference signal patterns mapped to downlink resource block pairs in a wireless communication system to which the present invention can be applied.
[0120] With reference to Figure 7, a pair of downlink resource blocks, that is, a unit in which a reference signal is mapped, can be represented in the form of a subframe in a time domain X 12 subcarriers in a frequency domain. That is, on a geometric time axis (a geometric x axis), a pair of resource blocks has a length of 14 OFDM symbols in the case of a normal cyclic prefix (CP) (Figure 7a) and has a length of 12 symbols OFDM in the case of an extended cyclic prefix (CP) (Figure 7b). In the resource block truss, the resource elements (REs) indicated by "0", "1", "2" and "3" mean the locations of the antenna port index CRSs "0", "1", "2" and "3", respectively, and the REs indicated by "D" signify the location of a DRS.
[0121] A CRS is described in more detail below. CRS is a sign of
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28/100 reference that is used to estimate the channel of a physical antenna and can be received by all UEs located within a common cell. CRS is distributed over a full frequency bandwidth. That is, the CRS is a cell-specific signal and is transmitted in each subframe over a broadband. In addition, CRS can be used for channel quality information (CSI) and data demodulation.
[0122] A CRS is defined in several formats depending on an antenna array on the transmission side (eNB). In the LTE 3GPP system (for example, Version 8), an RS for a maximum of four antenna ports is transmitted depending on the number of transmission antennas in an eNB. The side from which a downlink signal is transmitted has three types of antenna arrays, such as a single transmit antenna, two transmit antennas and four transmit antennas. For example, if the number of transmit antennas in an eNB is two, CRSs for an antenna port n ^Q 0 and an antenna port n ^Q 1 are transmitted. If the number of transmit antennas in an eNB is four, CRSs for n ^Q 0 ~ n ^Q 3 antenna ports are transmitted. If the number of transmission antennas in an eNB is four, a CRS standard in an RB is shown in Figure 7.
[0123] If an eNB uses a single transmitting antenna, reference signals for a single antenna port are arrayed.
[0124] If an eNB uses two transmit antennas, reference signals for two transmit antenna ports are arrayed using a time division multiplexing (TDM) scheme and / or a division multiplexing scheme frequency (FDM). That is, different time resources and / or different frequency resources are allocated in order to distinguish between reference signals for two antenna ports.
[0125] In addition, if an eNB uses four transmission antennas,
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29/100 reference for four transmission antenna ports are arranged in matrix using the TDM and / or FDM schemes. Channel information measured by the receiving side (i.e., UE) of a downlink signal can be used to demodulate transmitted data using a transmission scheme, such as single transmission antenna transmission, transmission diversity, spatial closed-circuit multiplexing, open-circuit spatial multiplexing or a multi-user antenna / multiple-user (MIMO) antenna.
[0126] If a multiple input multiple output antenna is supported, when an RS is transmitted over a specific antenna port, the RS is transmitted at the locations of specified resource elements depending on an RS standard and is not transmitted at the locations of feature elements specified for other antenna ports. That is, RSs between different antennas do not overlap.
[0127] A DRS is described in more detail below. DRS is used to demodulate data. In multi-input multiple-output antenna transmission, the pre-coding weight used for a specific UE is combined with a transmission channel transmitted by each transmission antenna when the UE receives an RS, and is used to estimate a corresponding channel without any change.
[0128] An LTE 3GPP system (for example, Version 8) supports a maximum of four transmission antennas, and a DRS for rating 1 beam formation is defined. The DRS for beam formation classification 1 also indicates an RS for an antenna port index 5.
[0129] In an LTE-A system, that is, an advanced and developed LTE system, the project is necessary to support a maximum of eight transmission antennas on the downlink of an eNB. Consequently, RSs for a maximum of eight transmit antennas must also be supported. In the LTE system, only downlink RSs for a maximum of four ports
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30/100 antenna were defined. Consequently, if an eNB has four to a maximum of eight downlink transmission antennas in the LTE-A system, RSs for these antenna ports need to be further defined and designed. Regarding the RSs for a maximum of eight transmit antenna ports, the previously mentioned RS for channel measurement and the previously mentioned RS for data demodulation need to be designed.
[0130] One of the important factors that need to be considered in the design of an LTE-A system is compatibility with previous versions, that is, that an UE LTE needs to operate well even in the LTE-A system, which needs to be supported by the system. From a transmission point of view RS, in the time-frequency domain in which a CRS defined in LTE is transmitted in a total band in each subframe, RSs for a maximum of eight transmission antenna ports need to be additionally defined. In the LTE-A system, if an RS standard for a maximum of eight transmit antennas is added in a total band in each subframe using the same method as the existing LTE CRS, the RS overhead is excessively increased.
[0131] Consequently, the newly designed RS in the LTE-A system is basically divided into two types, which include an RS that has a channel measurement object for selecting MCS or PMI (RS for channel status information or RS channel status indication (CSI-RS)) and an RS for demodulation of data transmitted via eight transmission antennas (data demodulation RS (DM-RS)).
[0132] The CSI-RS for the channel measurement object is characterized by the fact that it is designed for an object focused on channel measurement other than the existing CRS for measurement objects, such as channel measurement and automatic switching, and for demodulation of data. In addition, CSI-RS can also be used for an object for measurement, such as automatic change. CSI-RS does not
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31/100 needs to be transmitted in each subframe other than the CRS because it is transmitted to an object to obtain information about a channel state. In order to reduce the overhead of a CSI-RS, the CSI-RS is intermittently transmitted on the geometric time axis.
[0133] For data demodulation, a DM-RS is transmitted in a dedicated way to a UE programmed in a corresponding time-frequency domain. That is, a DM-RS for a specific UE is transmitted only in a region where the corresponding UE was programmed, that is, in the time-frequency domain in which the data is received.
[0134] In the LTE-A system, a maximum of eight transmission antennas are supported on the downlink of an eNB. In the LTE-A system, if RSs for a maximum of eight transmit antennas are transmitted over a total band in each subframe using the same method as the CRS in the existing LTE, the RS overhead is excessively increased. Consequently, in the LTE-A system, an RS was separated in the CSI-RS from the CSI measurement object for the selection of MCS or PMI and the DM-RS for data demodulation and, thus, the two RSs were added. CSI-RS can also be used for an object, such as an RRM measurement, but it was designed for a main object for the acquisition of CSI. The CSI-RS does not need to be transmitted in each subframe because it is not used for data demodulation. Consequently, in order to reduce the overhead of the CSI-RS, the CSI-RS is transmitted intermittently on the geometric time axis. That is, the CSI-RS has a period that corresponds to a multiple of the whole number of a subframe and can be periodically transmitted or transmitted in a specific transmission pattern. In this case, the period or standard in which the CSI-RS is transmitted can be defined by an eNB.
[0135] For data demodulation, a DM-RS is transmitted in a dedicated way to a UE programmed in a time-frequency domain
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Corresponding 32/100. That is, a DM-RS for a specific UE is transmitted only in the region in which programming is carried out for the corresponding UE, that is, only in the time-frequency domain in which the data is received.
[0136] In order to measure a CSI-RS, a UE needs to be aware of the information on the transmission subframe index of the CSI-RS for each CSI-RS antenna port of a cell to which the UE belongs, the location of a resource element (RE) CSI-RS time frequency within a transmission subframe and a CSI-RS sequence.
[0137] In the LTE-A system, an eNB must transmit a CSI-RS to each of a maximum of eight antenna ports. The features used for CSI-RS transmission from different antenna ports must be orthogonal. When an eNB transmits CSI-RSs to different antenna ports, it can orthogonally allocate resources according to the FDM / TDM scheme by mapping the CSI-RSs to the respective antenna ports for different REs. Alternatively, CSI-RSs for different antenna ports can be transmitted according to the CDM scheme to map the CSI-RSs to parts of codes orthogonal to each other.
[0138] When an eNB notifies a UE that belongs to the eNB of information about a CSI-RS, first, the eNB needs to notify the UE of information about a time-frequency in which a CSI-RS for each antenna port is mapped. Specifically, the information includes subframe numbers in which the CSIRS is transmitted or a period in which the CSI-RS is transmitted, a subframe deviation in which the CSI-RS is transmitted, a number of OFDM symbols in which the CSI RE -RS of a specific antenna is transmitted, frequency spacing, and the value of deviation or displacement of an RE on the geometric frequency axis.
[0139] A CSI-RS is transmitted through one, two, four or eight antenna ports. The antenna ports used in this case are p = 15, p = 15, 16, p = 15, ...,
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18, and p = 15, ..., 22, respectively. A CSI-RS can be defined for only one subcarrier rangeAf = 15 kHz.
[0140] In a subframe configured for CSI-RS transmission, a CSI-RS sequence is mapped to a complex value modulation symbol a_k, l ^A (p) used as a reference symbol on each antenna port p as in
Equation 12.
EQUATION 12 ^to k ^P l = k - k '+ 12m + <
for pe {15,16}, normal cyclic prefix for pe {17,18}, normal cyclic prefix for pe {19,2θ}, normal cyclic prefix for pe {21,22}, normal cyclic prefix for pe {15,16 }, extended cyclic prefix for pe {17,18}, extended cyclic prefix for pe {19,2θ}, extended cyclic prefix for pe {21,22}, extended cyclic prefix
I = l ’+ 21
CSI reference signal configurations 0-19, normal cyclic prefix CSI reference signal configurations 20 - 31, normal cyclic prefix CSI reference signal configurations 0-27, extended cyclic prefix pe {15,17,19,21} pe {16,18,20 , 22} / = 0.1 m = 0.1, ..., Nrb-1 m'-m + »Tinax, DL wDL ^{/ V} RB ~ ^{/ V} RB [0141] In Equation 12, (k ', l ') (where k' is a subcarrier index within a resource block and Γ indicates an OFDM symbol index within a partition.) and the condition of n_s is determined depending on a CSIRS configuration, such as Table 3 or Table 4.
[0142] Table 3 illustrates the mapping of (k ', l') from a CSI-RS configuration to a normal PLC.
TABLE 3
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CSI reference signal configuration Nún1 or 2(k ’, r) number of sin n _s mod 2 ref s4U, r) CS n _s mod 2 I configure8(k ’, r) ad n _s mod 2 Type 1 and 2 frame structure 0 (9.5) 0 (9.5) 0 (9.5) 0 1 (1L2) 1 (11.2) 1 (11.2) 1 2 (9.2) 1 (9.2) 1 (9.2) 1 3 (7.2) 1 (7.2) 1 (7.2) 1 4 (9.5) 1 (9.5) 1 (9.5) 1 5 (8.5) 0 (8.5) 0 6 (10.2) 1 (10.2) 1 7 (8.2) 1 (8.2) 1 8 (6.2) 1 (6.2) 1 9 (8.5) 1 (8.5) 1 10 (3.5) 0 11 (2.5) 0 12 (5.2) 1 13 (4.2) 1 14 (3.2) 1 15 (2.2) 1 16 (1.2) 1 17 (0.2) 1 18 (3.5) 1 19 (2.5) 1 Type 2 frame structure 20 (11.1) 1 (11.1) 1 (11.1) 1 21 (9.1) 1 (9.1) 1 (9.1) 1 22 (7.1) 1 (7.1) 1 (7.1) 1 23 (10.1) 1 (10.1) 1 24 (8.1) 1 (8.1) 1 25 (6.1) 1 (6.1) 1 26 (5.1) 1 27 (4.1) 1 28 (3.1) 1 29 (2.1) 1 30 (1.1) 1 31 (0.1) 1
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35/100 [0143] Table 4 illustrates the mapping of (k ’, l’) from a configuration
CSI-RS in an extended CP.
TABLE 4
CSI reference signal configuration Ni1 or 2(k ’, r) number of _s mod 2 signs of4(k ’, r) CSI reference c n _s mod 2 onfigure8(k ’, r) of us _s mod 2 Type 1 and 2 frame structure 0 (114) 0 (11.4) 0 (11.4) 0 1 (9.4) 0 (9.4) 0 (9.4) 0 2 (10.4) 1 (10.4) 1 (10.4) 1 3 (9.4) 1 (9.4) 1 (9.4) 1 4 (5.4) 0 (5.4) 0 5 (3.4) 0 (3.4) 0 6 (4.4) 1 (4.4) 1 7 (3.4) 1 (3.4) 1 8 (8.4) 0 9 (6.4) 0 10 (2.4) 0 11 (0.4) 0 12 (7.4) 1 13 (6.4) 1 14 (1.4) 1 15 (0.4) 1 Type 2 frame structure only 16 (11.1) 1 (11.1) 1 (11.1) 1 17 (10.1) 1 (10.1) 1 (10.1) 1 18 (9.1) 1 (9.1) 1 (9.1) 1 19 (5.1) 1 (5.1) 1 20 (4.1) 1 (4.1) 1 21 (3.1) 1 (3.1) 1 22 (8.1) 1 23 (7.1) 1 24 (6.1) 1 25 (2.1) 1 26 (1.1) 1
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CSI reference signal configuration Number of CSI reference signals configured 1 or 2(k ’, r) n _s mod 2 4(k ’, r) n _s mod 2 8(k ’, r) n _s mod 2 27 (0.1) 1
[0144] To reduce intercellular interference (ICI) in a multicellular environment that includes a heterogeneous network environment (HetNet), a maximum of 32 different configurations (in the case of a normal CP) or a maximum of 28 different configurations (in the case extended CP) is defined.
[0145] The CSI-RS configuration is different depending on the number of antenna ports and a CP within a cell, and a neighboring cell can have a maximum of different configurations. In addition, the CSI-RS configuration can be divided into a case where it is applied to both an FDD frame and a TDD frame and a case where it is applied only to a TDD frame depending on a frame structure.
[0146] (k ', l') and n_s are determined depending on a CSIRS configuration based on Table 3 and Table 4, and time-frequency resources used for CSI-RS transmission are determined depending on each CSI antenna port -LOL.
[0147] Figure 8 is a diagram that illustrates features to which reference signals are mapped in a wireless communication system to which the present invention can be applied.
[0148] Figure 8 (a) shows twenty types of CSI-RS configurations available for CSI-RS transmission over one or two CSI-RS antenna ports, Figure 8 (b) shows ten types of CSI-RS configurations available for four CSI-RS antenna ports, and Figure 8 (c) shows five types of CSI-RS configurations available for eight CSI-RS antenna ports.
[0149] As described above, radio resources (ie, a pair of REs)
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37/100 in which a CSI-RS is transmitted are determined depending on each CSI-RS configuration.
[0150] If one or two antenna ports are configured for CSI-RS transmission in relation to a specific cell, the CSI-RS is transmitted over radio resources in a CSI-RS configuration configured from the twenty types of CSI-RS configurations shown in Figure 8 (a).
[0151] Similarly, when four antenna ports are configured for CSI-RS transmission in relation to a specific cell, a CSI-RS is transmitted over radio resources in a CSI-RS configuration configured from the ten types of CSI-RS configurations shown in Figure 8 (b). In addition, when eight antenna ports are configured for CSI-RS transmission in relation to a specific cell, a CSI-RS is transmitted over radio resources in a CSI-RS configuration configured from the five types of CSI-RS configurations shown in Figure 8 (c).
[0152] One CSI-RS for each antenna port is subjected to CDM for each two antenna ports (ie, {15.16}, {17.18}, {19.20} and {21.22}) on the same radio and broadcast resources. For example, in the case of antenna ports 15 and 16, complex CSI-RS symbols for the respective antenna ports 15 and 16 are the same, but are multiplied by different types of orthogonal code (for example, Walsh code) and mapped to the same radio resources. The complex CSI-RS symbol for antenna port 15 is multiplied by [1, 1], and the complex CSI-RS symbol for antenna port 16 is multiplied by [1 -1] and mapped to the same resources radio. The same goes for the antenna ports {17.18}, {19.20} and {21.22}.
[0153] A UE can detect a CSI-RS for a specific antenna port by multiplying the code by which a transmitted symbol has been multiplied. That is, a transmitted symbol is multiplied by the code [1-1] multiplied in order to detect
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38/100 the CSI-RS for the antenna port 15, and a transmitted symbol is multiplied by the code [1 -1] multiplied in order to detect the CSI-RS for the antenna port 16.
[0154] Referring to Figure 8 (a) to 8 (c), in the case of the same CSI-RS configuration index, radio resources according to a CSI-RS configuration that has a large number of antenna ports include radio features that have a small number of CSI-RS antenna ports. For example, in the case of a CSI-RS 0 configuration, radio resources for the number of eight antenna ports include both radio resources for the number of four antenna ports and radio resources for the number of one or two antenna ports. antenna.
[0155] A plurality of CSI-RS configurations can be used in a cell. 0 or one CSI-RS configuration can be used for a non-zero power (NZP) CSI-RS, and 0 or several CSI-RS configurations can be used for a zero power (ZP) CSI-RS.
[0156] For each bit set to 1 in a zero power CSI-RS (ZP) ('ZeroPowerCSI-RS) which is a 16-bit bitmap configured by a high layer, a UE assumes zero transmit power in REs (except in a case where an ER overlays an ER assuming a CSI-RS NZP configured by a high layer) that corresponds to the four CSI-RS columns in Table 3 and Table 4. The most significant bit (MSB) corresponds to the index of the lowest CSI-RS configuration, and the next bits in the bitmap correspond sequentially to the next CSI-RS configuration indexes.
[0157] A CSI-RS is transmitted only on a downlink partition that satisfies the condition of (n_s mod 2) in Table 3 and Table 4 and a subframe that satisfies the CSI-RS subframe settings.
[0158] In the case of type 2 frame structure (TDD), a CSI-RS is not transmitted in a special subframe, a synchronization signal (SS), a subframe that collides against a PBCH or Message transmission
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SystemlnformationBlockTypel (SIB 1) or a subframe configured for paging message transmission.
[0159] In addition, an RE in which a CSI-RS for any antenna port that belongs to a set of antenna ports S (S = {15}, S = {15,16}, S = {17,18 }, S = {19.20} or S = {21.22}) is transmitted is not used for transmitting from a PDSCH or for transmitting CSI-RS from another antenna port.
[0160] The time-frequency resources used for CSI-RS transmission cannot be used for data transmission. Consequently, the data transfer rate is reduced as the CSI-RS overhead is increased. Considering this, a CSI-RS is not configured to be transmitted to each subframe, but it is configured to be transmitted in each transmission period that corresponds to a plurality of subframes. In that case, the CSI-RS transmission overhead can be significantly reduced compared to a case where a CSI-RS is transmitted to each subframe.
[0161] A subframe period (hereinafter referred to as a “CSI transmission period”) T_CSI-RS and an A_CSI-RS subframe deviation for CSI-RS transmission are shown in Table 5.
[0162] Table 5 illustrates CSI-RS subframe configurations
TABLE 5
CSI-RS-SubframeConfig ^z csi-rs Periodicity CSI-RS ^ CSI-RS (subframes) CSI-RS subframe shift ^to csi-rs (subframes) 0a4 5 ^ CSI-RS 5th 14 10 ^ CSI-RS ^_ 5 15 to 34 20 ^ CSI-RS “15 35 to 74 40 ^ CSI-RS ^_ 35 75 to 154 80 ^ CSI-RS ^_ 75
[0163] With reference to Table 5, the transmission period CSI-RS T_CSI
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RS and A_CSI-RS subframe deviation are determined depending on the CSI-RS l_CSI-RS subframe configuration.
[0164] The CSI-RS subframe configuration in Table 5 can be configured as one of the ‘SubframeConfig’ field and the ‘zeroTxPowerSubframeConfig’ field previously mentioned. The CSI-RS subframe configuration can be separately configured in relation to a CSI-RS NZP and a CSI-RS ZP.
[0165] A subframe that includes a CSI-RS satisfies Equation 13.
EQUATION 13 (10¾ + L «s / 2j-A _csi _ _rs ) mod Tc _SI _ _RS = 0 [0166] In Equation 13, T_CSI-RS means a CSIRS transmission period, A_CSI-RS means a subframe offset value , n_f means a frame number and n_s means a partition number.
[0167] In the case of a UE in which the transmission mode 9 has been configured in relation to a server cell, a CSI-RS resource configuration can be configured for the UE. In the case of a UE in which transmission mode 10 has been configured in relation to a server cell, one or more CSI-RS resource configurations can be configured for the UE.
[0168] In the current LTE standard, a CSI-RS configuration includes an antenna port number (antennaPortsCount), a subframe configuration (SubframeConfig) and a resource configuration (resourceConfig). Consequently, the CSI-RS configuration provides notification that a CSI-RS is transmitted on how many antenna ports, provides notification of the period and deviation of a subframe in which a CSI-RS will be transmitted, and provides notification that a CSI-RS is transmitted in which the location RE (that is, a frequency index and OFDM symbol) in a corresponding subframe.
[0169] Specifically, the following parameters for each configuration
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CSI-RS (resource) are configured through high-layer signaling.
[0170] - If transmission mode 10 has been configured, a CSI-RS resource configuration identifier [0171] - A CSI-RS port number (antennaPortsCount): a parameter (for example, a CSI-RS port, two CSI-RS ports, four CSI-RS ports or eight CSI-RS ports) indicating the number of antenna ports used for CSI-RS transmission [0172] - A CSI-RS (resourceConfig) configuration (referring to Table 3 and to Table 4): a parameter in relation to a CSI-RS allocation resource location [0173] - A CSI-RS subframe configuration (subframeConfig, ie l_CSI-RS) (referring to Table 5): one parameter in relation to the period and / or deviation of a subframe in which a CSI-RS will be transmitted [0174] - If transmission mode 9 has been configured, the transmission power P_C for CSI feedback: in relation to the assumption of a UE for reference PDSCH transmission power for feedback, when the UE derives feedback the CSI and adopts a value within a range of [-8, 15] dB at a step size of 1 dB, P_C is assumed to be the energy ratio per resource element (EPRE) per PDSCH RE and an EPRE CSI-RS.
[0175] - If transmission mode 10 has been configured, the transmission power P_C for CSI feedback in relation to each CSI process. If the CSI subframe sets C_CSI, 0 and C_CSI, 1 are configured by a high layer in relation to a CSI process, P_C is configured for each CSI subframe set in the CSI process.
[0176] - A nJD pseudo-random sequence generator parameter [0177] - If transmission mode 10 has been configured, a high layer parameter ‘qd-CRS-lnfo-r1T that includes a QCL scramble identifier for
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42/100 an almost colocalized UE assumption (QCL) type B (qcl-Scramblingldentityr11), a CRS port count (crs-PortsCount-r11) and an MBSFN subframe configuration list parameter (mbsfn-SubframeConfigList-r11).
[0178] When a CSI feedback value derived by a UE has a value within the range of [-8, 15] dB, P_C is assumed to be the ratio between EPRE PDSCH and EPRE CSI-RS. In this case, the EPRE PDSCH corresponds to a symbol in which the ratio between EPRE PDSCH and EPRE CRS is p_A.
[0179] A CSI-RS and a PMCH are not configured in the same subframe of a server cell at the same time.
[0180] In the type 2 frame structure, if four CRS antenna ports have been configured, a CSI-RS configuration index that belongs to the set [20 to 31] (referring to Table 3) in the case of a normal or a CSI-RS configuration index that belongs to the set [16 to 27] (referring to Table 4) in case an extended PLC is not configured in a UE.
[0181] A UE can assume that the CSI-RS antenna port of a CSI-RS resource configuration has a QCL relationship with delay spread, Doppler spread, Doppler shift an average gain and an average delay.
[0182] An UE in which transmission mode 10 and QCL type B have been configured can assume that antenna ports 0 to 3 that correspond to a CSI-RS resource configuration and antenna ports 15 to 22 that correspond to an CSI-RS resource configuration has QCL relationship with Doppler scattering and Doppler shift.
[0183] In the case of a UE in which the transmission modes 1 to 9 have been configured, a CSI-RS ZP resource configuration can be configured in the UE in relation to a server cell. In the case of a UE in which transmission mode 10 has been configured, one or more CSI-RS ZP resource configurations can be configured in the UE in relation to a server cell.
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43/100 [0184] The following parameters for a CSI-RS ZP resource configuration can be configured via high-layer signaling.
[0185] - The CSI-RS ZP configuration list (zeroTxPowerResourceConfigList) (referring to Table 3 and Table 4): a parameter in relation to a zero-power CSI-RS configuration [0186] - The CSI- RS ZP (zeroTxPowerSubframeConfig, that is, l_CSI-RS) (referring to Table 5): a parameter in relation to the period and / or deviation of a subframe in which a zero power CSI-RS is transmitted [0187] A CSI -RS ZP and a PMCH are not configured in the same subframe of a server cell at the same time.
[0188] In the case of a UE in which transmission mode 10 has been configured, one or more channel state information interference measurement (CSI-IM) configurations can be configured in the UE in relation to a server cell .
[0189] The following parameters for each CSI-IM resource configuration can be configured through high-layer signaling.
[0190] - The CSI-RS ZP configuration (referring to Table 3 and Table 4) [0191] - the CSI RS ZP subframe configuration l_CSI-RS (referring to Table 5) [0192] A configuration of CSI-IM resource is the same as any of the configured CSI-RS ZP resource settings.
[0193] A CSI-IM resource and a PMCH are not configured within the same subframe of a server cell at the same time.
PROBE REFERENCE SIGNAL (SRS) [0194] An SRS is mainly used for channel quality measurement to perform selective uplink frequency programming and is not
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44/100 related to the transmission of uplink data and / or control information. However, the present invention is not limited to this, and the SRS can be used for a number of other purposes to increase power control or support various startup functions for recently unscheduled terminals. As an example of the initialization function, an initial modulation and coding scheme (MCS), initial data transmission power control, timing advance and semi-selective frequency programming can be included. In this case, semiselective frequency programming refers to programming that selectively allocates frequency resources in a first partition of a subframe and that allocates frequency resources by jumping pseudo-randomly to another frequency in a second partition.
[0195] Furthermore, the SRS can be used to measure a downlink channel quality under the assumption that the radio channels are reciprocal between the uplink and the downlink. The assumption is particularly effective in a time division duplexing (TDD) system in which the uplink and downlink share the same frequency spectrum and are separated in the time domain.
[0196] SRS subframes transmitted by a certain UE in a cell can be represented by a cell-specific broadcast signal. A 4-bit cell-specific ‘srsSubframeConfiguration’ parameter represents 15 available subframe arrays through which the SRS can be transmitted through each radio frame. The arrays provide flexibility to adjust the SRS overhead according to a deployment scenario.
[0197] The 16 th matrix completely shuts down an SRS switch in the cell and this is mainly suitable for a server cell serving high speed terminals.
[0198] Figure 9 illustrates an uplink subframe that includes a
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45/100 poll reference signal symbol in a wireless communication system to which the present invention can be applied.
[0199] With reference to Figure 9, the SRS is continuously transmitted in the last SC-FDMA symbol in the arranged subframe. Therefore, the SRS and DMRS are located on different SC-FDMA symbols.
[0200] PUSCH data transmission is not allowed in a specific SCFDMA symbol for SRS transmission and as a result, when polling overhead is the highest, that is, even if SRS symbols are included in all subframes, overload of poll does not exceed approximately 7%.
[0201] Each SRS symbol is generated by a basic sequence (random sequence or a sequence defined based on Zadoff-Ch (ZC)) for a given time unit and frequency band, and all terminals in the same cell use the same basic sequence. In that case, SRS transmissions from a plurality of UEs in the same cell at the same time in the same frequency band are orthogonal by different cyclic deviations from the basic sequence, and are distinguished from each other.
[0202] When assigning different basic sequences to the respective cells, the SRS sequences from different cells can be distinguished, however the orthogonality between different basic sequences is not guaranteed.
[0203] As more and more communication devices require greater communication capacity, there is a need for improved mobile broadband communication compared to existing radio access technology (RAT). Mass machine-type communications (MTCs), which provide multiple services anytime, anywhere by connecting many devices and objects, are one of the biggest problems to consider in next generation communication. In addition, a communication system design that considers a service / UE sensitive to reliability and latency is
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46/100 being discussed.
[0204] The introduction of next generation radio access technology that considers advanced mobile broadband communication, mass MTC, low-latency and ultra-reliable communication (URLLC) is discussed, and in the present invention, the technology is called new RAT for the sake of convenience.
SELF-SUFFICIENT SUB-FRAMEWORK STRUCTURE [0205] Figure 10 is a diagram illustrating a self-sufficient subframe structure in the wireless communication system to which the present invention can be applied.
[0206] In a TDD system, in order to minimize data transmission latency, a new RAT 5 Generation (5G) considering a self-supporting subframe structure as shown in Figure 10.
[0207] In Figure 10, a dashed area (symbol index of 0) indicates a downlink control area (DL) and a black area (symbol index of 13) indicates an uplink control area (UL) . An unmarked area can also be used for DL data transmission or for UL data transmission. Such a structure is characterized by the fact that DL transmission and UL transmission are sequentially performed in a subframe, and DL data is transmitted in a subframe, and ACK / NACK UL can also be received. As a result, it takes less time to retransmit data when a data transmission error occurs, thereby minimizing the final data transmission latency.
[0208] In such a self-contained subframe structure, there is a need for a time interval between the base station and the UE for the process of converting from the transmission mode to the receiving mode or from the receiving mode to the transmission mode. For this purpose, some of the OFDM symbols at the time of switching from DL to UL in the
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47/100 self-sufficient subframe are configured for a guard period (GP).
ANALOGUE BEAM FORMATION [0209] In a millimeter wave (mmW), a wavelength is shortened, so that a plurality of antenna elements can be installed in the same area. That is, a total of 64 (8x8) antenna elements can be installed in a two-dimensional array over a range of 0.5 lambda (ie, wavelength) on a 4 X 4 (4 by 4) panel cm with a wavelength of 1 cm in a 30 GHz band. Therefore, in mmW, it is possible to increase a beam formation gain (BF) to increase the coverage or to increase the transfer rate with the use of multiple elements of antenna.
[0210] In this case, if a transceiver unit (TXRU) is provided so that the power and transmission phase can be adjusted for each antenna element, independent beam formation is possible for each frequency resource. However, when TXRUs are installed on all 100 antenna elements, there is a problem that the cost effectiveness is deteriorating. Therefore, a method of mapping a plurality of antenna elements in a TXRU and adjusting a beam direction using an analog phase shifter is considered. Such an analog BF method has a disadvantage that frequency selective BF can be performed by making only one beam direction in all bands.
[0211] A hybrid BF with TXRUs B, which is an intermediate form of digital BF and analog BF, and less than Q antenna elements, can be considered. In this case, although there is a difference depending on a connection method of TXRUs B and antenna elements Q, the number of beam directions that can be transmitted at the same time is limited to B or less.
[0212] Hereinafter, representative examples of a method of connecting TXRUs and antenna elements will be described with reference to
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48/100 drawing attachments.
[0213] Figure 11 shows a model of transceiver unit in a radio communication system to which the present invention can be applied.
[0214] A TXRU virtualization model shows a relationship between an output signal from TXRUs and an output signal from antenna elements. According to the correlation between the antenna element and the TXRU, the TXRU model can be divided into the TXRU option 1 virtualization model and a submatrix split model as illustrated in Figure 11 (a) and TXRU option 2 virtualization model and a full connection model, as shown in Figure 11 (b).
[0215] With reference to Figure 11 (a), in the case of the submatrix partition model, the antenna element is divided into multiple groups of antenna elements and each TXRU is connected to one of the groups. In this case, the antenna element is connected to only one TXRU.
[0216] With reference to Figure 11 (b), in the case of the total connection model, the signals from multiple TXRUs are combined and transmitted to a single antenna element (or an array of antenna elements). That is, a schematic is illustrated, in which the TXRU is connected to all antenna elements. In this case, the antenna element is connected to all TXRUs.
[0217] In Figure 11, q represents a transmission signal vector of antenna elements that have M waves co-polarized in a column, w represents a broadband TXRU virtualization weight vector and W represents a phase vector multiplied by a analog phase shifter. In other words, the analog beamforming direction is determined by W. x represents a signal vector of M_TXRU TXRUs.
[0218] In this document, the mapping of antenna ports and TXRUs can be 1 to 1 or 1 to many.
[0219] In Figure 11, the mapping (mapping from TXRU to element)
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49/100 between the TXRU and the antenna element is merely an example, and the present invention is not limited to that. The present invention can be similarly applied even for the mapping between the TXRU and the antenna element, which can be implemented in several other ways in terms of hardware.
CHANNEL STATE INFORMATION (CSI) RETALIMENTATION [0220] In an LTE / LTE-A 3GPP system, user equipment (UE) is defined to report channel status information (CSI) to a base station (BS or eNB).
[0221] CSIs collectively refer to information that can indicate the quality of a radio channel (or called a link) formed between the UE and the antenna port. For example, a rating indicator (RI), a pre-coding matrix indicator (PMI), a channel quality indicator (CQI), and the like correspond to the information.
[0222] Here, the RI represents classification information for a channel, which means the number of streams received by the UE through the same time-frequency resource. Since this value is determined depending on the fading of the channel, the value is fed back from the UE to the BS with a period generally longer than the PMI and CQI. The PMI is a value that reflects a channel space characteristic and represents a preferential pre-coding index by the UE based on a metric, such as signal-interference-noise ratio (SINR). The CQI is a value that represents the intensity of the channel, and generally refers to a SINR reception that can be obtained when BS uses PMI.
[0223] In the LTE / LTE-A 3GPP system, BS configures a plurality of CSI processes for the UE and can receive CSI for each process. Here, the CSI process consists of a CSI-RS for measuring signal quality from the BS and a CSI interference measurement feature (CSI-IM) for measuring interference.
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REFERENCE SIGNAL (RS) VIRTUALIZATION [0224] In mmW, it is possible to transmit a PDSCH in only one analog beam direction at a time by means of analog beam formation. In this case, data transmission from the BS is only possible for a small number of UEs in the corresponding direction. Therefore, if necessary, the analog beam direction is configured differently for each antenna port so that data transmission can be carried out simultaneously to a plurality of UEs in different analog beam directions.
[0225] Figure 12 is a diagram illustrating a service area for each transceiver unit in the wireless communication system to which the present invention can be applied.
[0226] In Figure 12, 256 antenna elements are divided into 4 parts to form 4 submatrices, and the connection structure of the TXRU to the submatrix will be described as an example, as shown in Figure 11 above.
[0227] When each submatrix consists of a total of 64 (8x8) antenna elements in the form of a two-dimensional array, the specific analog beam formation can cover an area corresponding to a 15 degree horizontal angle area and a vertical angle area of 15 degrees. That is, the zone in which the BS must be cut is divided into a plurality of areas, and services are provided one by one at a time.
[0228] In the following description, it is assumed that the CSI-RS antenna ports and TXRUs are mapped 1 to 1. Therefore, the antenna port and TXRU have the same meaning as the following description.
[0229] As shown in Figure 12 (a), if all TXRUs (antenna ports, submatrices) (ie TXRU 0, 1, 2, 3) have the same analog beamforming direction (ie, region 1), the transfer rate of the corresponding zone can be increased by forming the digital beam with a higher resolution
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51/100 high. In addition, it is possible to increase the transfer rate of the corresponding zone by increasing the classification of the transmission data for the corresponding zone.
[0230] As shown in Figure 12 (b) and 12 (c), if each TXRU (antenna port, submatrix (ie TXRU 0, 1,2, 3) has a different analog beamforming direction (or that is, region 1 or region 2, data can be transmitted simultaneously to UEs distributed over a wider area in the subframe (SF).
[0231] As an example shown in Figures 12 (b) and 12 (c), two of the four antenna ports are used for PDSCH transmission for UE1 in region 1 and the remaining two antenna ports are used for PDSCH transmission for UE2 in region 2.
[0232] In particular, in Figure 12 (b), the PDSCH1 transmitted to the UE1 and the PDSCH2 transmitted to the UE2 represent examples of spatial division multiplexing (SDM). Unlike this, as shown in Figure 12 (C), the PDSCH1 transmitted to the UE1 and the PDSCH2 transmitted to the UE2 can also be transmitted by frequency division multiplexing (FDM).
[0233] Between a service plan for one area using all the antenna ports and a service scheme for many areas at the same time when dividing the antenna ports, a preferred scheme is changed according to the classification and the modulation and coding scheme (MCS) that serves the UE to maximize the cell throughput. In addition, the preferred method is changed according to the amount of data to be transmitted to each UE.
[0234] BS calculates a cell transfer rate or programming metric that can be obtained when an area is served using all the antenna ports, and calculates the cell transfer rate or programming metric that can be obtained obtained when two areas are served by the division of
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52/100 antenna ports. BS compares the cell throughput or programming metric that can be obtained for each scheme to select the final transmission scheme. As a result, the number of antenna ports participating in the PDSCH transmission is changed by SF by SF. In order for the BS to calculate the transmission MCS of the PDSCH according to the number of antenna ports and to reflect the calculated MCS transmission for a programming algorithm, CSI feedback from the appropriate UE is required.
BEAM REFERENCE SIGNAL (BRS) [0235] The beam reference signals are transmitted over one or more antenna ports (p = {0, 1, ..., 7}).
[0236] The sequence of reference signals ‘r_l (m)’ can be defined by Equation 14 below.
EQUATION 14 rXm) - -4 (1 - 2 · c (2m)) + / 4 (1 - 2 - f (2 «8-1)), m - 0.1, ... / 8 - - 18 ) - 1 v2 v2 [0237] Where I = 0, 1, ..., 13 is the number of OFDM symbols. N_RB ^A max, DL represents the largest downlink band configuration and N_sc ^A RB is expressed by a multiple. N_sc ^The RB represents the size of the resource block in the frequency domain and is expressed by the number of subcarriers.
[0238] In Equation 14, c (i) can be predefined as a pseudo-random sequence. The pseudo-random sequence generator can be initialized at the beginning of each OFDM symbol using Equation 15 below.
EQUATION 15 = 2 ⁱ⁰ (7 '(¾ 4-1) + Γ 8-1) (2 8-1) 8- 2/1 [0239] Where N_ID ^A cell represents a physical layer cell identifier. n_s = floor (l / 7) and floor (x) represent a floor function to derive a maximum integer from x or less. Γ = I mod 7 and mod represent a module operation.
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BEAM REFINING REFERENCE SIGN (BRRS) [0240] The beam refinement reference signals (BRRSs) can be transmitted up to eight antenna ports (p = 600, 607). BRRS transmission and reception are dynamically programmed in the downlink resource allocation in xPDCCH.
[0241] The sequence of reference signals ‘r_l, ns (m)’ can be defined by Equation 16 below.
EQUATION 16 *> Vj ( / I) ““ ss (1 - 2c (2 i)) + / —I - 2c (Zm + 1 f ~ 0 »l <...> ~ I - 1
V'2 - 'V 2' ’1«!
[0242] Where n_s represents the number of partitions in the radio frame. I represents the number of OFDM symbols in the partition. c (i) can be predefined as the pseudo-random sequence. The pseudo-random sequence generator can be initialized at the beginning of each OFDM symbol using Equation 17 below.
EQUATION 17% «£” 2 ^{i! L} '(70't'. _S 4- Ij 4 ”/ 4 · 1 4 * 1) + 4 · 1 S55 mod 20 [0243] In this document, N_ID ^A BRRS is configured to the UE through RRC signaling.
DL PHASE NOISE COMPENSATION REFERENCE SIGN [0244] The phase noise compensation reference signals associated with xPDSCH can be transmitted on the antenna port (or ports) p = 60 and / or p = 61 according to DCI signage. In addition, the phase noise compensation reference signals associated with xPDSCH can be present as a valid reference for phase noise compensation only if the xPDSCH transmission is associated with the corresponding antenna port. In addition, the phase noise compensation reference signals associated with xPDSCH can be transmitted only in physical resource blocks and symbols using
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54/100 which the corresponding xPDSCH is mapped. In addition, the phase noise compensation reference signals associated with xPDSCH can be identical across all symbols with xPDSCH allocation.
[0245] For any antenna port p and {60.61}, the reference signal sequence ‘r (m)’ is defined by Equation 18 below.
EQUATION 18 (1 2.4'2m) 'μ J “2> 4 ² «* 1) 1 « / 4 F1 [0246] In this document, c (i) can be predefined as the pseudo-random sequence. The pseudo-random sequence generator can be started at the beginning of each subframe using Equation 19 below.
EQUATION 19
[0247] Where n_SCID is 0 unless otherwise specified. In xPDSCH transmission, n_SCID is given in a DCI format associated with xPDSCH transmission.
[0248] n JD ^A (i) (where i = 0, 1) is given as follows. When the value of n_ID ^A PCRS, i is not provided by the upper layer, n_ID ^A (i) is equal to N_ID ^A cell. Otherwise, n_ID ^A (i) is equal to n_ID ^A PCRS, i.
[0249] According to the RAN1 3GPP conference ^Q 86, the Layer DL 1 (L1) / Layer (L2) beam management procedures are supported within the following one or multiple transmit reception points (TRPs).
[0250] i) P-1: P-1 is used to allow measurements of UE in different Tx TRP beams to support the selection of transmission (Tx) TRP) / receiving (Rx) UE beam (s).
[0251] - For bundling in the TRP, P-1 includes intra-TRP / inter-TRP Tx beam scans from a set of different bundles.
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55/100 [0252] - For bundling the UE, P-1 includes EU Rx beam scans from a set of different bundles.
[0253] - The Tx TRP beam and the Rx UE beam can be jointly or individually determined.
[0254] ii) P-2: P-2 is used to allow UE measurements on different Tx TRP beams in order to change the inter / intra-TRP beam (s).
[0255] - a set of beams for beam refinement smaller than in P-1 can be used.
[0256] - P-2 can be considered as a special case of P-1.
[0257] iii) P-3: P-3 is used to allow UE measurement on the same Tx TRP beam to change the UE Rx beam in the case where the UE uses beam formation.
[0258] - The same procedure can be designed for intra-TRP beam measurement and inter-TRP beam measurement.
[0259] - The UE may not know the intra-TRP beam or the inter-TRP beam.
[0260] For example, procedures P-2 and P-3 described above can be performed together and / or multiple times to obtain the change of beam Tx TRP / beam Rx UE simultaneously.
[0261] Management of multiple pairs of Tx / Rx beams can be supported for a single UE.
[0262] Assistance information from another carrier is being discussed to be transferred to the UE in a beam management procedure.
[0263] The above procedure can be applied to any frequency band.
[0264] The above procedure can be used in single / multiple bundles per TRP.
[0265] Furthermore, according to the RAN1 3GPP conference no ^Q 86bis, the
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56/100 following UL beam management should be further studied in the NR.
[0266] - A procedure similar to downlink beam management can be defined.
[0267] i) U-1: U-1 is used to allow TRP measurements on different EU Tx beams to support the selection of the EU Tx beam (s) / Rx TRP beam (s).
[0268] - This cannot necessarily be used in all cases.
[0269] ii) U-2: U-2 is used to allow TRP measurements on different Rx TRP beams in order to change / select the inter / intra-TRP Rx beam (s).
[0270] iii) U-3: U-3 is used to allow TRP measurement on the same Rx TRP beam to change the UE Tx beam in the event that the UE uses beam formation.
[0271] The indication of information related to Tx / Rx correspondence can be supported.
[0272] UL beam management is studied based on: Physical Random Access Channel (PRACH), Polling Reference Signal (SRS), and Demodulation Reference Signal (DM-RS) (Other channels and reference signals (RS) not not prevented).
[0273] As described below, the uplink beam (UL) management procedure needs to be studied considering the Tx / Rx beam match.
[0274] - For the case where both the TRP and the UE have the Tx / Rx beam match [0275] - For the case where the TRP does not have the Tx / Rx beam match and / or the UE does not beam matching Tx / Rx [0276] Furthermore, the following aspects must be considered for the UL power control (PC) project:
[0277] - No cell-specific reference signal similar to LTE to estimate path loss
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57/100 [0278] - Beam-based transmissions / receptions [0279] - Analog beam formation in eNB / UE [0280] - Multiple beam / multiple stream transmission [0281] - Multiple numerologies [0282] - Inter information exchange -TRP [0283] - Dynamic TDD can be studied later and other aspects are not prevented.
[0284] Furthermore, the following UL PC project is studied as a starting point:
[0285] - Fractional power control in LTE as structure [0286] - RS DL for path loss measurement, for example, RS in beam management DL P-1, P-2 and P-3 for multiple beam scenario or single beam scenario [0287] - Separate PC configurations for UL control and data channel [0288] For PC UL, specific numerology parameter configuration and separate PC configurations for UL multiple beams / multiple can be studied later.
[0289] In addition, according to the conference of RAN1 3GPP n ^Q 87, in NR, for NR-PUSCH at least in advanced mobile broadband (eMBB), [0290] - Open circuit power control based on the estimate of trajectory loss is supported. In this case, the path loss is estimated using RS DL for measurement. In addition, fractional power control is supported. For which measurement (or measurements) DL RS is used (RS can be formed by bundles) can be studied later.
[0291] - Power control is supported, which is based on NW signaling. In this case, dynamic UL power adjustment is considered.
[0292] The following can be further studied:
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58/100 [0293] - Numerology specific power control, for example, numerology specific power control parameters [0294] - Beam specific power control parameters [0295] - Power control for other RSs and physical channels [0296] - Power control for concession-free PUSCH, if supported [0297] - Power control by layer (group) [0298] In addition, in NR, the CSI-RS supports Tx DL beam scan and Rx beam scan HUH. In this case, the CSI-RS can be used on P-1, P-2 and P-3.
[0299] CSI-RS NR supports the following mapping structure.
[0300] - CSI-RS N_P port (s) can be mapped for each (sub) time unit.
[0301] - Over the (sub) time unit, the same CSI-RS antenna ports can be mapped.
[0302] - A value of N_P is studied later.
[0303] - Here, “time unit” means n (> = 1) OFDM symbols in the configured / reference numerology. Whether consecutive or non-consecutive, the OFDM symbols that comprise the time unit are studied later.
[0304] - The port multiplexing method (for example, FDM, TDM, CDM, any combinations) is studied later.
[0305] - Each unit of time can be divided into subunits of time.
[0306] - The partitioning method (for example, TDM, interleaved FDMA (IFDMA), OFDM symbol level partition with the same / shorter OFDM symbol length (that is, greater subcarrier spacing) than the symbol length Reference OFDM (subcarrier spacing), and other methods are not prevented) is studied later.
[0307] - Such a mapping structure can be used to support multiple
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59/100 Tx panels / chains.
[0308] - The CSI-RS mapping options for Tx and Rx beam scan are described below.
[0309] i) Option 1: The Tx beams are the same over time subunits within each time unit. Tx beams are different over time units.
[0310] ii) Option 2: Tx beams are different over time subunits within each time unit. The Tx beams are the same over time units.
[0311] iii) Combination of Option 1 and Option 2:
[0312] The beams are the same over time subunits within a unit of time.
[0313] Tx beams are different for each subunit of time within another unit of time.
[0314] Here, for example, a combination of different time units in terms of, for example, number and periodicity is studied later.
[0315] Only the Tx scan or the Rx scan may be possible and another option is also not prevented.
[0316] Whether the mapping structure above is configured with one or multiple CSI-RS resources, it is studied later.
UPPER LINK TRANSMISSION / RECEPTION METHOD [0317] An eNB name described in the patent is used as a comprehensive term that includes remote radio head (RRH), eNB (or gNB), transmission point (TP), receiving point (RP), a retransmission and the like. Henceforth, for the sake of convenience of description, a proposed method will be described based on an LTE 3GPP system and / or a new RAT (NR) system.
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However, a range of the system to which the proposed method is applied may extend to other systems (for example, UTRA and the like) in addition to the LTE 3GPP system.
[0318] Hereinafter, a method of controlling UL transmission power in NR will be described.
[0319] In the NR system design, new features are being considered for UL, such as the OFDM-based UL transmission and single symbol UL control channel. The present invention proposes a method in which a UL power control procedure should be considered, which includes basic components, such as path loss compensation, power displacement, Transmission Power Control (TPC) command and some additional feature .
[0320] - Basic parameters for UL power control [0321] 1 -1) Path loss compensation [0322] According to UL power control in the current LTE system, two types of path loss compensation are considered ; one is compensation for loss of total trajectory, and the other is compensation for loss of fractional trajectory.
[0323] In the NR system, the UE can be considered to measure the received reference signal power (RSRP) using a certain type of RS DL (for example, synchronization signal, CSI-RS, etc.), and , then, the UE derives the loss of trajectory between the UE and its associated eNB using the measured RSRP (filtered high layer).
[0324] The UL transmission power from the UE can be compensated totally or partially considering the estimated loss of trajectory.
[0325] First, offsetting the total path loss can maximize equity for cell-border UEs. In other words, the
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61/100 power received from the cell edge UE in the gNB (i.e., base station) can be comparable to the power received from the central cell UE.
[0326] On the other hand, if fractional path loss compensation is used, the power received on the gNB side from the central cell UE may be much greater than that of the cell edge UE. The loss of trajectory of the cell edge UE can be compensated by adjusting another parameter or displacement of power so that the power received from the cell edge UE can be adequately controlled. However, the power received from the central cell UE may be redundant due to the already sufficient amount of power received in general.
[0327] In the case of UL transmission data channel, such redundant power can be used to improve spectral efficiency by applying a higher Modulation and Encoding Scheme (MCS) level (for example, the central cell UE may have capacity using a smaller number of PRBs for the same TB size). On the other hand, in the case of UL control channel transmission that uses a fixed amount of resources, it is not clear how to use redundant power to improve spectral efficiency, since a size (payload) of Uplink Control Information (UCI) is not dependent on the UE location or channel condition. Therefore, it is not desirable to consider the full compensation for the power control of the EU control channel.
[0328] In addition, in the case of compensation of fractional path loss for UL data channel transmission, the power difference received between the central cell UE and the cell edge UE can be adjusted using a value of a factor of compensation of loss of fractional trajectory, and this value may be different, according to a cell radius and target performance.
[0329] Therefore, for the power control of the EU control channel (for example, PUCCH, etc.), it is desirable to consider the loss compensation
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62/100 total trajectory.
[0330] 1 -2) Power shift depending on data rate [0331] In general, it is expected that the highest transmission power will be needed to support the highest data rate. However, it can be inefficient for power control of the UL data channel to use both fractional path loss compensation and power displacement (ie, Delta_TF configuration in the LTE standard) depending on the data rate simultaneously. In addition, in the current LTE, this type of power displacement is not supported for a rating higher than 2. Therefore, one must consider supporting only the fractional path loss compensation in NR without power displacement configuration depending on the rate of displacement. Dice.
[0332] For the power control of the UL data channel, it is necessary to consider supporting only the fractional path compensation in the NR without the power displacement depending on the data rate.
[0333] 1 -3) TPC command [0334] The TPC command can be used to compensate for channel variations due to rapid fading. In relation to the current LTE, the PUCCH power can be adjusted by the TPC command signaled in the DL assignment DCIs while the PUSCH (or SRS) power can be adjusted by the TPC command signaled in the UL grant DCI. In addition, for UL transmissions without associated DCI, such as semi-persistent programming (SPS), periodic CSI, or SRS, the TPC command can be signaled to a certain EU group using the DCI 3 / 3A format. There can be two types of TPC procedures for updating UL transmission power; one is the cumulative TPC, and the other is the absolute TPC. The cumulative TPC is suitable for fine tuning the EU transmission power using the relatively small step size of TPC values. On the other hand, the absolute TPC can be useful to reinforce the EU transmission power at once
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63/100 using the relatively small step size of TPC values.
[0335] When the loss of trajectory compensation aspects are investigated, it is desirable to consider the loss of trajectory aspects, the power displacement, and the TPC command for the UL power control project design for the NR, in consideration cell implantation, a type of UL physical channel (for example, control or data), and a wireless channel condition.
[0336] - Additional features for power control in NR [0337] 1-4) Beam forming operation [0338] In the NR project, it may be necessary to consider the introduction of an operation based on analog (or hybrid) beam forming, especially for high frequency band (for example, above 6 GHz). With the formation of analog beams, it may be required that the TX / RX gNB beam scan (for example, TDM between TX / RX gNB beams) is carried out not only for the transmission of common DL signal and information, such as synchronization (for example, PSS / SSS in LTE) or broadcast system information (for example, Physical Broadcast Channel (PBCH) in LTE), but also for the transmission of data channels and DL / UL control in order to to serve UEs located in different areas (or beam directions).
[0339] In this case, it is necessary to consider the differentiation of power control parameters between different beams for the UE, since the power required for UL performance is different per beam for the UE.
[0340] However, especially for cumulative TPC procedures, it is necessary to further study whether the separation of PC parameter by beam is superior compared to a common TPC accumulation process regardless of changes or switching of beams. The latter means that the TPC accumulation process will not be restarted even if a server beam is changed by a beam management procedure, considering that if
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64/100 wishes that the transmission power level already stabilized remains as high as possible, unless such beam changes occur at a different TRP.
[0341] For targeted service (for example, Ultra-Reliable and Low Latency (URLLC) and Advanced Vehicle for Everything (eV2X) that requires higher reliability, there may be a configurable additional power shift to be applied in the TPC accumulation process whenever the beam change or switching occurs within the same TRP, in order to alleviate potential power control mismatch due to beam switching / switching. In addition, this can be applied to retransmission cases to improve HARQ performance, which needs to be carried out following the highest layer configurations provided by gNB.
[0342] For cumulative TPC procedures, a configurable additional power displacement to be applied in a common TPC accumulation process needs to be considered, whenever the beam change or switching occurs within the same TRP, depending on a targeted service (for example example, URLLC and eV2X) that requires higher reliability.
[0343] In this regard, when the proposal of the present invention will be described in more detail, the following problems need to be considered in relation to the “beam specific power control parameters” in the UL PC related contents of the RAN1 3GPP n ^Q 87 conference .
[0344] - A problem must be considered, in which how to transmit power control (TPC) is performed (when the UE transmits UL) while a reception point (for example, eNB) directed by a transmission signal is the same (by specific beam management), when an Rx beam from the receiving point is changed (and / or when the Tx beam of a transmitter (for example, the eNB) is changed).
[0345] As a solution to the problem, in one method, the
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65/100 TPC chain / process / parameter (s) for each specific beam can be independently configured. As a result, independent power control for each beam can be applied. The reason is that when a transmit / receive beam direction is changed, a better transmit power level can be changed due to a change in the reception interference environment, etc.
[0346] However, the independent performance of the power control may not continuously guarantee a better operation. Since the reception point itself is not changed, but only a Tx / Rx beam applied to the same transmission / reception point is changed, it may be more advantageous to maintain a PC that is maintained (stabilized) in the related technique, such as accumulation TPC, etc. as possible in terms of performance than applying a rapid TPC change.
[0347] However, since the best power control according to the beam change / switching can be slightly changed, at least one technique among the techniques proposed below can be applied to increase reliability considering the slight change in the better power control.
[0348] - As described above, a TPC process that depends on the beam change / switching is not initialized in relation to the same TRP.
[0349] In this case, as an example of a method that allows the UE to recognize the same TRP, “in which case the beam change / switching occurs based on the CSI-RS configured in the form of (sub) time unit ”Can become a condition That is, when the condition of the“ case in which the beam change / switching occurs based on the CSI-RS configured in the form of (sub) time unit ”is satisfied, the same TRP can be recognized. For example, the corresponding RS is configured for a specific beam management purpose and / or in a single CSI-RS resource configuration or a plurality
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66/100 of CSI-RS configurations, but a specific group among the plurality of CSI-RS configurations is configured (that is, the same TRP characteristic is configured to be known, etc.), that is, the same TRP can be implicitly (or explicitly) recognized.
[0350] For example, under a condition where a specific group of the corresponding RS DL (for example, CSI-RS) / SS (s) “that does not initiate the TPC process (that is, shares TPC accumulation and / or follows the same PC UL process) ”is implicitly configured, a rule can be defined / configured, which is determined so that RS / SS (s) similarly receives the same power value Tx and / or the value of open circuit P0 becomes the same group. In addition, in the case of beam change / switching in the group, the TPC accumulation can be inherited / shared (for example, it can be the same PC UL process).
[0351] In this case, in the case of an explicit indication, the specific Near Colocalized (QCL) signal capable of identifying the same TRP, etc. can be explicitly indicated for the UE. For example, specific explicit configuration / signaling is provided to allow the specific RS / SS (s) for the purpose to become the same group and, as a result, TPC accumulation can be inherited / shared in the case of the change / switching of beam in the group (for example, it can be the same PC UL process).
[0352] Additionally, when the beam change / switching takes place on the same TRP, a specific power offset value (for example, P_offset_beam) to be added to a power control process can be configured by RRC (and / or a second layer (L2) level configuration, such as a medium access control (MAC) control element (MAC), etc. and / or a first layer level (layer 1) configuration, such as DCI, etc.) (at once). That is, in the case of TPC accumulation, when the beam change / switching occurs, the power displacement value (for example, P_offset_beam)
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67/100 can be added to a current power value. This serves to increase reliability.
[0353] The power shift value can be configured by RRC (and / or an L2 level setting, such as CE MAC, etc. and / or an L1 level setting, such as DCI, etc.) differently / independent for each specific service (for example, V2X, URLLC, eMBB, ..., or a specific L1 parameter that can correspond to each service, for example, for each temporary radio network identifier (RNTI)).
[0354] In the parts described in the description above with the expression “beam change / switch”, the operations of “beam change” and “beam switch” can be particularly distinguished.
[0355] For example, the beam change can mean that only one server beam is configured and one server beam is changed. In addition, beam switching can mean a case where multiple server beams are configured and dynamic beam switching is performed. For example, (transmission) (semi) OL) based on beam cycling defined / configured by a specific pattern (time domain).
[0356] In the case of a beam change, how a beam change command should be delivered to the UE should preferably be considered. More specifically, if the beam shift command is delivered for an L1 signal (for example, DCI) or an L2 signal (for example, a CE MAC), the wide range / high resolution power shift value within the message can be delivered.
[0357] In addition, a beam switching command can also be delivered to the UE with the L1 signal (for example, DCI) or the L2 signal (for example, CE MAC). The specific (separate) power displacement value (or values) within the message is delivered to indicate implicitly or explicitly, even
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68/100 information that indicates when the specific power displacement value should be applied. For example, when information related to the beam switching / cycling switching periodicity is set together or set separately, the power offset value (s) can be configured to be applied whenever the specific beam switching occurs. For example, a switched pattern after the same beam is transmitted twice can be configured as an operation of applying the power shift value only on the first transmission that is switched and transmitted and not applying the power shift value on the second streaming.
[0358] In addition / alternatively, an indication of whether to inherit a previous TPC accumulation value or reset the previous TPC accumulation value when delivering the beam change command (and / or beam switching command) can also be delivered together to the UE. For example, the indication can be included in a corresponding L1 and / or L2 command message.
[0359] When the previous TPC accumulation value is indicated to be inherited from eNB, a TPC value (for example, + X dB, 0 dB, or -Y dB, ...) indicated in a circuit TPC field specific open (transmitted together) can be accumulated and applied to a current TPC accumulation value (in addition, the power displacement value can additionally be added here (either once or every time the beam is changed in the case of switching of beam)).
[0360] When the previous TPC accumulation value is indicated to be reset from eNB, a TPC value (for example, + X dB, 0 dB, or -Y dB, ...) indicated in a circuit TPC field specific closed loop (transmitted together) can be applied as an initial TPC accumulation value in a
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69/100 newly started (restarted) PC process (for example, an OLPC component can be calculated and then recently applied here as an initial TPC accumulation value) (in addition, the power displacement value can be additionally added here ( once or every time the beam is changed in the case of beam switching)).
[0361] In addition, SRS transmission may be required for closed circuit PCs, in which case a relationship between an SRS transmission time and beam change / switching command delivery time also needs to be definitively prescribed. For example, when beam change (or switching) is carried out from beam 1 to beam 2, SRS for a beam direction 2 can generally be transmitted after the beam change, however an operation is defined / configured in order to to transmit in a beam 2 direction before the beam change and, as a result, more accurate PC can be performed. For this purpose, with which beam the UE is allowed to transmit the SRS in aperiodic SRS triggering (for example, via an L1 message) can be explicitly indicated for the UE. Alternatively, an operation can be configured to perform a plurality of transmissions at one time for a specific predetermined "set of SRS beams" that is configured in advance (separately). For example, in a situation where candidate beams that may be a subject for which SRS transmission is defined / configured as beam 1, beam 2, ..., beam 4, the “SRS beam set” may include all the four beams and, for example, can be configured to include only beam 2 and beam 3 (here, this configuration can then be reconfigured by a third layer (L3) (for example, RRC) and / or L2 ( for example, MAC) and / or L1 (for example, DCI)). When a “set of SRS beams” is thus configured and the specific SRS trigger message is received, the UE can operate to perform both the SRS transmission for beam 2 and the SRS transmission for beam 3 for
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70/100 SRS resource (s) indicated by the corresponding trip (or configured in advance by interlocking with the trip).
[0362] In addition, a fallback mode power control scheme can be defined / configured, which is applied when the same Rx TRP beam is maintained by beam blocking or the like, but when only the Tx UE beam needs to be changed. For example, during a UL beam scan process, while the separate / independent power control control parameter (s) for the second best beam (pair) is determined / configured / stored, the UE can be configured to initiate transmission Specific UL (eg SRS transmission, PUCCH transmission and / or PUSCH transmission) by specific fallback mode power control. As a more specific example, a state is assumed in which a first best beam Tx and / or beam Rx (even), a second best beam Tx and / or beam Rx (even), ..., information in a specific direction is determined by specific UL beam management and information is reported from the UE to the eNB or the information is provided from the eNB to the UE. Initially, the transmission / reception with beam formation considering the 1 ^Q best beam Tx and / or beam Rx (even) is initiated in the specific UL transmission (for example, SRS transmission, PUCCH transmission and / or PUSCH transmission) of the UE. In this case, when retransmission occurs due to a failure in decoding at the receiver (for example, the eNB) in relation to the transmission signal (for example, the eNB feedback NACK), or similar, the fallback mode power control and / or an operation to perform another beam-based transmission can be defined / configured. In particular, in a system where “synchronous HARQ” is applied, in a situation where a separate specification schedule grant for retransmission is not provided and is set / configured to initiate retransmission, according to an indicated timeline , a specific Tx beam and / or specific Rx beam and / or
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71/100 specific power offset (including the P_offset_beam value for each retransmission) applied to an nth retransmission (n = 1, 2, ...) is defined / configured in a specific pattern in advance to provide the information to the UE can be configured / indicated to initiate UL transmission based on information.
[0363] More specifically, in this case, a different method can be applied depending on whether a UL transmission target is PUCCH or PUSCH. For example, in PUCCH, eNB uses / applies power control parameter (s) (including a related P_offset_beam value (for each retransmission)) when the 2 ^Q best Tx UE beam is used in relation to a Rx TRP beam adapted for a 1 ^Q best beam pair (UL) and in PUSCH, eNB uses / applies power control parameter (s) (including a related P_offset_beam value (for each retransmission)) for a 2 ^Q best UL beam pair, or that is, an associated configuration can be provided to the UE and the UE can operate to initiate the corresponding transmission based on the configuration provided.
[0364] A k-th best beam Tx and / or Rx (pair) applied when fallback transmission occurs (for example, n-th specific retransmission) can be configured to have a relatively wider beam width. Therefore, the k-th best beam Tx and / or Rx (pair) can be configured / applied for the corresponding fallback purpose (for example, a purpose to deal with the occurrence of error for the 1 ^Q best beam (pair)) . Alternatively, a scheme for configuring / restricting an operation when initiating the transmission by the specific “beam switching” mentioned above can also be applied during the fallback transmission (for example, nth retransmission).
[0365] 1 -5) Power transmission period [0366] In general, the amount of information transmitted through the UL data channel is expected to be much greater than that of the EU control channel.
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Therefore, the power required for transmitting the UL data channel may be greater than that of the UE control channel. For the NR project, TDM is considered for multiplexing the structure between the data channels and UL control for reducing latency, flexible UL / DL configuration and forming analog beams. In the event that the UL control and data channels are multiplexed in the TDM manner, it may be necessary to deal with the power imbalance between these two different channels which may be relatively larger compared to the current LTE. In addition, considering several OFDM numerologies (for example, different sub carrier spacing or symbol duration) used for NR, it is necessary to deal with the power transmission period between the UL control and data channel for a given numerology (for example, large subcarrier spacing).
[0367] It is desirable to consider additional features for UL power control in the NR, such as an analog beam forming operation and the power transmission period.
[0368] 1 -6) Power control by TRP and by layer [0369] A technique for transmitting coordinates over intra / inter-TRP multiples is discussed. Especially for high frequency bands in the NR, the number of dominant rays per TRP or single panel can be limited (for example, mainly observed by up to classification 2). Therefore, in order to obtain high single-user spectral MIMO efficiency (SU-MIMO), coordinate transmission schemes across multiple TRPs need to be fully investigated in NR, including Multipoint Coordinate (CoMP), Dynamic Point Selection (DPS ) and Joint Transmission of independent layer (JT). When DL-related DCIs indicate the transmission classification and a coordinate scheme applied, DCI decoding latency on the UE side can be a major problem whenever beam formation occurs.
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73/100 analog signals is applied for a given time instance. This is because the DCI transmission can be conducted by a server TRP, but the actual data transmission can be performed by another TRP as an example.
[0370] In the case of independent layer JT, where the particular layer (s) can be transmitted from different TRPs, the corresponding UL transmission power per layer group may need to be configured and controlled by gNB, since at least the loss of trajectory of different TRPs may be different. Furthermore, the separate UL power control process that drives different TRPs needs to be further studied in the UL-CoMP context.
[0371] UL power control by TRP and by layer group needs to be further investigated, at least to adequately support independent layer DPS and JT in NR.
[0372] Hereinafter, a specific UL beam power control method in NR will be described.
[0373] The following agreements are made with UL power control:
[0374] i) For specific beam power control, NR defines beam specific open and closed circuit parameters.
[0375] Here, details on “beam-specific”, especially in relation to the manipulation of layer-specific / group-specific / panel-specific linkage of beam pair link will be discussed later.
[0376] ii) gNB is aware of power reserve differences for different waveforms, if the UE can be configured for different waveforms. Details of displacement and power control parameters (for example, P_c, Max or another open / closed circuit parameter will be discussed later.
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74/100 [0377] iii) Code-based transmission to UL is supported at least by signaling the following information in the UL concession:
[0378] - Polling Resource Indicator (SRI) + Transmission Pre-coding Matrix Indicator (TPMI) + Transmission Classification Indicator (TRI) [0379] Here, TPMI is used to indicate a preferred precoder in relation to the SRS port (s) on the SRS resource selected by the SRI.
[0380] If a single SRS resource is configured, there is no SRI. In this case, TPMI is used to indicate a preferred precoder over the SRS port on the only configured SRS resource.
[0381] - Selection of multiple SRS resources is supported.
[0382] A proposal according to the present invention for beam specific UL power control will be described based on the above agreements.
[0383] It was agreed to support the differentiation of beam-specific open and closed loop parameters between different beams for a UE, since the power required for UL performance may be different per beam for a UE.
[0384] However, especially for cumulative TPC procedures, it is necessary to further study whether the separation of PC parameter by beam is superior compared to a common TPC accumulation process regardless of beam changes or switching. The latter means that the TPC accumulation process will not be restarted even if a server beam is altered by a beam management procedure, considering that it is desired that the transmission power levels already stabilized remain as high as possible, unless such changes in beam occur at a different TRP.
[0385] Per targeted service (eg URLLC eV2X) that requires higher reliability, there may be an additional power shift
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75/100 configurable to be applied in the TPC accumulation process whenever the beam change or switching occurs within the same TRP, in order to alleviate the potential power control incompatibility due to the beam change / switching.
[0386] For cumulative TPC procedures, a configurable additional power displacement to be applied in a common TPC accumulation process needs to be considered, whenever the beam change or switching occurs within the same TRP, depending on a targeted service (for example example, URLLC and eV2X) that requires higher reliability.
[0387] Regarding Open Circuit Power Control (OLPC), appropriate RS DL, such as a Synchronization Signal Block (SS) (DMRS PBCH) and CSIRS for loss of path compensation must be defined at least for UEs that support beam matching. Considering UL-CoMP operations, different RS DL for loss of trajectory compensation can be configured by SRS feature for CSI UL acquisition.
[0388] For example, the proposed content can be applied as follows:
[0389] - PL_c (q_d) is loss of downlink path in dB, which is calculated by the UE using a reference signal resource (RS) q_d in relation to a server cell c.
[0390] Here, the UE can be configured with the number of RS resources by the highest layer parameter (for example, 'num-pusch-pathlossReference-rs') that indicates the number of PUSCH path loss reference RSs.
[0391] In addition, each set of RS configurations for the number of RS resources can be provided by a higher layer parameter (for example, pusch-pathloss-Reference-rs) that indicates PUSCH path loss reference RS. Here, the highest layer parameter (for example, pusch
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76/100 pathloss-Reference-rs) indicating PUSCH path loss reference RS can include one or both of a set of SS / PBCH block indexes provided by a higher layer parameter (for example, 'p ^usch pathlossReference -SSB) indicating a PUSCCH path loss synchronization signal block (SSB) and a set of CSI-RS configuration indexes provided by a higher layer parameter (for example, 'puschpathlossReference-CSIRS') which indicates CSI - PUSCH trajectory loss reference RS.
[0392] The UE can identify an RS resource in the RS resource pool to match the SS / PBCH block or for the CSI-RS configuration as information (value) provided by a higher layer parameter (for example, 'pusch- pathlossreference-index ') which indicates a PUSCH path loss reference index.
[0393] If the UE is configured by the highest layer parameter (for example, 'SRS-SpatialRelationlnfo') a mapping between a set of SRS resources and a set of RS resources to obtain an estimate of downlink path loss, the UE uses the RS resources indicated by a value of an SRI in a DCI format (for example, DCI format 0_0 or DCI format 0_1) that programs the PUSCH transmission to obtain the downlink path loss estimate. That is, when a parameter (for example, SRSSpatialRelationlnfo) that indicates the set of SRS spatial relation information for the highest layer indicates a CSI-RS or an SSB, the UE can apply the parameter to calculate the path loss (PL ).
[0394] In addition, the parameter can be configured (or defined) for each SRS resource or set of SRS resources (for example, higher layer signaling (RRC, etc.)) as described above.
[0395] RRC parameters can be defined as shown in
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Table 6 below.
TABLE 6
SRS-SpatialRelationlnfo Configuration of spatial relationship between reference RS and target RS. Reference RS is SSB / CSI-RS / SRS. Included in SRSResourceConfig num-pusch-pathlossReference-rs The number of RS DL configurations for measuring path loss Individual path loss estimates are maintained by the UE and used for PUSCH power control, for each setting. RS N configurations can be configured. When a PUSCH beam indication is present, N is 1,2, 3 or 4 and otherwise N = 1pusch-pathlossReference-rsconfig The configuration (for example, CSI-RS configuration or SS block) to be used for PUSCH path loss estimate RS N configurations can be configured.pusch-pathlossReferenceSSBPresent in puschpathlossReferencers-confiq pusch-pathlossReferenceCSIRSPresent in puschpathlossReferencers-confiq pusch-pathlossReference-rsPresent in puschpathlossReferencers-confiq pathlossreference-index index that corresponds to each RS of the reference RS configuration PL Present in puschpathlossReferencers-confiq
[0396] However, the above operation can be limited to be applicable only when the highest layer parameter (for example, “SRSSpatialRelationlnfo”) that indicates the SRS spatial relation information indicates a CSI-RS or an SSB. That is, if the highest layer parameter (for example, “SRS-SpatialRelationlnfo”) that indicates the SRS spatial relation information indicates an (other) SRS resource (this case may correspond to a “no beam match” case) , an operation can be defined / configured / indicated, which calculates the path loss based on an RS DL, such as a separately configured or pre-configured RS DL (for example, a CSI-RS or a
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SSB) (and / or, for example, determined by a predefined / configured function or rule based on a standard type of RS DL, such as an SS block (DMRS PBCH) or a set of configured CSI-RSs) as proposed below .
[0397] And / or if the parameter (“SRS-SpatialRelationlnfo”) that indicates the SRS spatial relation information indicates an (other) SRS resource, as described above, when the indicated SRS resource itself is configured, if the parameter (“ SRS-SpatialRelationlnfo ”) that indicates the separate / independent SRS spatial relation information indicates a CSI-RS or an SSB, this can be applied in the loss of trajectory calculation. That is, a parameter (“SRSSpatialRelationlnfo”) that indicates the SRS spatial relation information, which is a subparameter for the SRS resource itself indicated by the SRI field in the DCI, indicates an (other) SRS resource (UL beam management (for Management Beam (BM)), if a parameter (“SRS-SpatialRelationlnfo”) that indicates the SRS spatial relation information, which is a sub-parameter for this resource, indicates a CSI-RS or an SSB, it is possible to indicate the RS DL that it covers multiple stages in such a method in which the parameter is applied for the calculation of path loss.This indirect indication scheme can be generalized in such a way that a (other) continuous SRS resource is achieved through several stages, as indicated, from so that the specific RS DL indicated is applied to the path loss calculation.
[0398] For a UE without beam matching, path loss compensation can be performed by the predefined / configured function or rule based on the standard type of the RS DL, such as the SS block (DMRS PBCH) and / or the set of configured CSI-RSs. In other words, the UE can calculate a downlink path loss estimate value using the RSRP calculated using the RS DL (for example, SS block and / or CSI-RS) and calculate the power of
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79/100 uplink as reverse compensation based on the estimated downlink path loss value.
[0399] That is, such RS DL (for example, SS block (DMRS PBCH) and / or a set of configured information CSI-RSs) can be configured separately for the UE (for example, by RRC, CE MAC and / or DCI). Then, the UE can perform the path loss compensation operation based on it.
[0400] And / or even if the RS DL information is not separately configured by eNB, the UE can perform the path loss compensation operation based on the specific RS DL (for example, the SS block (DMRS PBCH) and / or the set of configured CSI-RSs) for the server cell. In this case, for example, the specific RS DL can correspond to at least one RS DL (previously reported or last) that has a standard RS DL or a lower (or higher) index (when rated for a medium power level ( for example, RSRP)) or a better power level based on information based on it.
[0401] And / or, at the same time, a specific calculation function, such as a maximum operation or a specific weighted average function can be defined / configured. For example, a max function or some weighted average functions can be defined to compensate for loss of path for cases of no beam matching.
[0402] Therefore, for OLPC, the RS DL suitable for path loss compensation must be defined or configured by SRS resource. In addition, a predefined / configured function for path loss compensation must be determined for the UE without beam matching.
[0403] Regarding transmission for UL code book based transmission, the SRI in the UL concession may indicate the selection of multiple
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80/100 SRS features.
[0404] Multiple SRS resources can support the joint transmission of multiple panels on UL. In addition, each panel transmission associated with each indicated SRS resource can target different UL reception points (RPs) in the context of UL-CoMP.
[0405] To adequately support this, the NR network must be able to at least calculate accurate MCS per group of different layers that correspond to different SRS resources (or different SRS sets (groups)), with a power control process separated by SRS feature.
[0406] Therefore, multiple ULPC processes for the UE need to be supported, and each ULPC process can be associated with at least one SRS resource configured for the UE.
[0407] For example, SRS resource identifiers (IDs) configured n ^Q 1 and ^Q 2 can be associated with the same ULPC A process, while another SRS resource ID configured n ^Q 3 can be associated with another ULPC B process. ULPC A and B processes can target different reception points.
[0408] 0u the ULPC process can mean that the same parameter (for example, a dB unit power value (P0) indicated by eNB for uplink power control, reference signal information (for example, SSB , CSI-RS, etc.) used to estimate the downlink path loss is calculated by the UE, an alpha value by which the downlink path loss estimate value calculated by the UE is multiplied in order to compensate for the downlink path loss estimate) is used for uplink transmission power control (ie uplink reference signal (eg SRS) and uplink channel (eg PUSCH and PUCC) ). Therefore, in the example above, one or more SRS resources associated with the same ULPC process can
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81/100 means that the same power control parameter is applied when the UE transmits the SRS on the corresponding SRS resource. Consequently, in the example above, a ULPC process can be associated with one or more SRS resources and when the one or more SRS are grouped in the SRS resource set (group), it can be seen that the parameters for power control are individually defined for each set of SRS resources. That is, according to the description above, it can be interpreted that the SRSs n ^Q 1 and ^Q 2 belong to a set of SRS resources (group) and, as a result, a parameter for common power control can be applied.
[0409] In addition, SRS n ^Q 1 and ^Q 2 resources that follow the same ULPC A process can be dynamically selected by the SRI indication in the UL grant. That is, in which SRS resource the UE should transmit the SRS between the SRS n ^Q 1 and ^Q 2 resources that belong to a set of SRS resources can be indicated to the UE by the SRI field in the UL concession.
[0410] For example, when SRS resources n ^Q 1 and ^Q 3 are jointly indicated by the SRI field in the UL concession, this can be interpreted as a transmission operation of multiple UL panels separated by group of layers or a joint reception operation UL-CoMP on the gNB side.
[0411] In this case, independent power control can be performed for the indicated SRS resource. And / or the number of classifications / layers can be indicated separately (in the same UL grant) for each SRS resource indicated. And / or TPMI information (separate) adapted for this purpose can be provided for each SRS resource indicated (in the same UL concession). That is, in this case, since SRS resources (that is, SRS resources n ^Q 1 and ^Q 3) that belong to different sets of SRS resources (groups) are simultaneously indicated for the UE, it can be interpreted that the control of Independent power is performed for each SRS resource.
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82/100 [0412] In other words, a plurality of SRS resources (ie, that belong to different sets of SRS resources, that is, associated with different TRPs) can be indicated simultaneously by an SRI field in the UL grant, and for each of the plurality of SRS resources, different groups of layers can be configured. In this case, the set of parameters for the PUSCH power control can be individually determined for each group of layers.
[0413] Consequently, to properly support UL transmission of multiple panels and UL-CoMP operations, multiple ULPC processes (ie multiple SRS resource sets (groups) to which the same power control parameter is applied for each resource set SRS (group)) for the UE must be supported and each ULPC process (ie, each set of SRS resources (group)) can be associated with at least one SRS resource configured for the UE.
[0414] In the description above, for the sake of convenience of description, two sets of SRS resources (groups) are assumed and two SRS resources are indicated through an SRI field. However, this is for convenience of description and the present invention is not limited to that.
[0415] Hereinafter, a method of controlling UL transmission power in NR will be described.
[0416] The following agreements are made with UL power control:
[0417] i) NR supports loss of specific beam path to ULPC.
[0418] ii) The following RS DL can be used to calculate path loss (PL) for ULPC.
[0419] - If the power shift between SSS and DM-RS to PBCH is known to the UE, both SSS from the SS block and DM-RS to PBCH are used.
[0420] - If the power shift between SSS and DM-RS to PBCH is not known by the UE, only the SSS of the SS block is used.
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83/100 [0421] - CSI-RS is used.
[0422] iii) In the aperiodic SRS transmission triggered by a single aperiodic SRS trigger field, the UE can be configured to transmit N (N> 1) SRS resources for UL beam management.
[0423] Hereinafter, the UL power control method in NR will be described based on the above agreements.
[0424] It was agreed to support the differentiation of beam-specific open and closed loop parameters between different beams for the UE in the NR, since the power required for UL performance may be different per beam for a UE.
[0425] However, especially for cumulative TPC procedures, it is necessary to further study whether the separation of PC parameter per beam is superior compared to a common TPC accumulation process regardless of changes or switching of beams. The latter means that the TPC accumulation process will not be restarted even if a server beam is altered by a beam management procedure, considering that it is desired that the transmission power levels already stabilized remain as high as possible, unless such changes in beam occur at a different TRP.
[0426] By targeted service (eg URLLC eV2X) that requires higher reliability, there may be a configurable additional power shift to be applied in the TPC accumulation process whenever the beam change or switching occurs within the same TRP, the in order to alleviate potential power control incompatibility due to beam change / switching.
[0427] For cumulative TPC procedures, a configurable additional power displacement to be applied in a common TPC accumulation process needs to be considered, whenever beam change or switching
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84/100 occurs within the same TRP, depending on a targeted service (for example, URLLC and eV2X) that requires higher reliability.
[0428] Regarding OLPC, considering UL-CoMP operations, different RS DL for loss of path compensation can be configured by SRS resource for CSI UL acquisition. For a UE without beam matching, path loss compensation can be performed by the predefined / configured function or rule based on the standard type of the RS DL, such as the SS block (DMRS PBCH) and / or the CSI- Configured RSs. For example, a max function or some weighted average functions can be defined to perform path loss compensation in the event of no beam matching.
[0429] In OLPC, a predefined / configured function for path loss compensation must be determined for the UE without beam matching.
[0430] Considering the agreements related to UL code-based transmission, the SRI in the UL grant may indicate the selection of multiple SRS resources, which can support the joint transmission of multiple UL panels. In addition, each panel transmission associated with each indicated SRS resource can target different UL reception points (RPs) in the context of UL-CoMP. To adequately support this, the NR network must be able to at least calculate accurate MCS per group of different layers that correspond to the different SRS resource, also with a separate power control process per SRS resource. In general, multiple ULPC processes for the UE need to be supported, and each ULPC process can be associated with at least one SRS resource (and / or at least RS / SS DL for OLPC, as described above) configured for the UE.
[0431] Additional / alternatively, RS / SS (s) DL configured specific correspondents to be submitted to OLPC by ULPC process
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85/100 can be switched to another RS / SS (for example, through CE MAC and / or DCI). Additionally / alternatively, (once) the additional power displacement / deviation values to be applied at that time can be indicated (together) (to extend to a greater range than the normal TPC range) and the UE can be defined / configured / indicated to reflect the additional displacement / deviation values of additional power for TPC accumulation. For example, SRS IDs configured n ^Q 1 and ^Q 2 can be associated with the same ULPC A process, while another SRS resource ID configured n ^Q 3 can be associated with another ULPC B process. ULPC A and B processes can target different reception points. In addition, SRS n ^Q 1 and ^Q 2 resources that follow the same ULPC A process can be dynamically selected by the SRI indication in the UL grant. For example, when SRS n ^Q 1 and ^Q 3 resources are jointly indicated by the SRI field in the UL concession, this can be interpreted as a transmission operation of multiple UL panels separated by group of layers or a joint reception operation UL-CoMP on the gNB side.
[0432] Consequently, to adequately support multiple panel UL transmission and UL-CoMP operations, multiple ULPC processes (ie multiple SRS resource sets (groups) to which the same power control parameter is applied for each resource set SRS (group)) for the UE must be supported and each ULPC process (ie, each set of SRS resources (group)) can be associated with at least one SRS resource configured for the UE.
[0433] In addition / alternatively, specific ULPC process groups (s) explicitly / implicitly configured, as described above can share Closed Loop Power Control (CLPC), so that when the UE performs uplink power control, the UE can be set / configured to apply / accumulate TPC accumulation together. For example, OLPC can be separated / divided (independently) for each
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86/100 process, but the CLPC can be configured to be shared. In addition / alternatively, OLPC as well as CLPC can be configured to be independently separated / divided and applied to each processor.
[0434] Additional / alternatively, when programming specific UL data (ie, a PUSCH) in a specific UL concession for the eNB, it is possible to explicitly indicate the transmission of UL data (ie, PUSCH) according to a certain ULPC process (that is, uplink power control is carried out by applying a set of parameters for specific power control) in the corresponding UL concession. That is, a field to explicitly indicate that the ULPC is applied to carry out UL data transmission can be included in the UL concession.
[0435] Additionally / alternatively, the UE can be implicitly indicated to follow the specific ULPC process at the time of power control of programmed UL data (ie PUSCH) by interlocking with a specific existing DCI field (or value) (eg , an HARQ identifier (ID)). In other words, depending on the DCI field (or value), it can be implicitly indicated which set of parameters for the power control should be used.
[0436] For example, a specific HARQ ID value can be interlocked with a specific ULPC identifier (ID) in advance (for example, through RRC and / or CE MAC). That is, the mapping relationship between the HARQ ID and the ULPC ID can be configured in advance (for example, through RRC and / or CE MAC). In addition, the UE can transmit the uplink by determining the uplink transmission power by applying the ULPC interlocking process, according to which HARQ ID the UE is programmed by the DCI (that is, by applying the set corresponding power control parameters).
[0437] In this case, as an example, the specific HARQ ID (s) can be
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87/100 associated with a specific type of independent service (for example, eMBB or URLLC) and, thus, there is an effect of allowing different power levels to be determined for each type of communication service. For example, URLLC can be configured to transmit at a relatively higher power than eMBB.
[0438] In other words, a form can be configured / applied, in which a specific type of service (for example, eMBB or URLLC) is linked in advance (for example, through RRC / CE MAC, etc.) for each ID Specific HARQ. Therefore, it is possible to start specific data type programming by L1 signaling (for example, by DCI, associated with the HARQ ID) to transmit an uplink data packet for a specific type of service (for example, eMBB or URLLC) .
[0439] Additionally / alternatively, a specific ULPC can be implicitly indicated by interlocking with a specific existing DCI field (value) (for example, the SRI field described above). In other words, depending on the SRI field (or value), which set of parameters for uplink power control should be used can be implicitly indicated.
[0440] For example, a specific SRI field value (for example, indicating resource SRS (s)) can interlock with a specific ULPC ID in advance (for example, RRC and / or MAC CE). That is, the mapping relationship between the value of the SRI field and the ULPC ID can be configured in advance (for example, through RRC and / or CE MAC). In addition, the UE can determine the uplink transmission power and transmit the uplink by applying the ULPC interlocking process (ie, applying the uplink power control parameter set) according to which SRI value (s) is indicated and programmed by the DCI.
[0441] In that case, as an example, the specific SRI (s) value can be
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88/100 associated with the uplink transmission panel (or panels) of a specific UE and / or the target receiving point (s) of the eNB. Therefore, there is an effect in which eNB provides the flexibility to allow the UE to carry out uplink transmission at different power levels by different ULPC processes.
[0442] In addition / alternatively, through a form, such as specific common DCIs (for example, transmitted in a common research space (CSS), for example, a form similar to DCI LTE 3 / 3A), each ULPC process can be mapped to an independent state and / or EU index (for example, a specific RNTI value). Consequently, for which ULPC TPC (accumulation) process must be performed it can be transmitted at once (for multiple UEs) (in CSS format).
[0443] As a result, in an example of the most flexible method among the methods mentioned above, the eNB can independently inform the UE which RP / target beam and / or Tx UE panel is indicated through individual SRI fields. At the same time, which power control to apply can be indicated separately via specific individual ULPC indicators and depending on which type of service uplink data (for example, indicated via RRC and / or CE MAC) can be transmitted, it can be indicated by specific individual service type indicators. The high flexibility of the uplink programming combination can be supported using separately indicated or similar types.
[0444] Regarding the aperiodic SRS N (> 1) transmission triggered by the single aperture SRS trigger field, a problem in the transmission power for the N SRS resources for UL beam management can be solved, in general, by control mechanisms UL power ratings as mentioned above by SRS configured resource (group).
[0445] For example, gNB can associate N specific SRS resources with
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89/100 same ULPC process. Then, the same transmission power can be guaranteed for the N SRS features for beam management. An additional method can be discussed, to configure the trip state description by RRC and / or CE MAC to replace the current transmission power level with SRS resource, according to the associated ULPC process. This serves to impose the same Tx power level for N SRS resources regardless of the current ULPC process (es) (for example, applying the highest current Tx SRS power to one of N SRS resources in a similar way to other N-1s SRS resources). That is, even if there is a specific ULPC process that is already followed for each SRS resource to determine the transmission power for the N (> 1) aperiodic SRS resources to be triggered together, the UE can be configured / indicated (additionally) to perform at least one operation described below (in addition to information indicating which N specific features or not basically) in a description (for example, configured through RRC and / or CE MAC) in relation to an operation that the UE must perform when the corresponding trigger state itself can be dynamically displayed.
[0446] - As a scheme to "apply the highest current Tx SRS power to one of the N SRS resources in a similar way to other N-1 SRS resources" described above, when there are N power values determined according to the ULPC process current with respect to N SRS resources, respectively, N corresponding SRS transmission powers can be configured to be equal to a value among the N power values. Here, the value can include the highest value (or the lowest value to reduce interference with (another cell), etc.) among the N power values determined according to the ULPC process or a value (for example, average, average weighted, etc.) calculated using a specific defined / configured function to produce a representative power value with the N power values. Additional / alternatively, after the power level is equalized, if the
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90/100 power level exceeds a maximum amount of power (for example, P_c_MAX) that can be maximally transmitted, the power level can be configured to be reduced according to a corresponding restriction value at once. Additional / alternatively, if a power sharing rule is defined / configured, which must be applied to signals (for example, PUCCH, PUSCH, etc.) to be transmitted to another specific uplink, the target power level to be reduced it can be defined as a target power level according to the power sharing rule / to which the power sharing rule must be applied.
[0447] - As another scheme, not in a scheme for calculating a specific “higher power level” and defining the target power level as the highest power level described above, the same power level can be configured for be defined as the applicable “total power” (even if there are specific ULPC processes (s) applied to each unit (group) of SRS resources at the time, continually disregarding the specific ULPC process (s) in relation to the N SRS resources at once (ie substitution) .Additionally / alternatively, after the power level is equalized, if the power level exceeds a maximum amount of power (for example, P_c_MAX) that can be maximally transmitted, the power level can be set to be reduced according to a corresponding constraint value at once Additional / alternatively, if a power sharing rule is defined / configured, it must be applied aa signals (eg PUCCH, PUSCH, etc.) to be transmitted to another specific uplink, the target power level to be reduced can be set to a target power level according to the power sharing rule / ao which power sharing rule should be applied.
[0448] - As in yet another scheme, not in the scheme for calculating a
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91/100 specific “highest power level” and definition of the target power level as the highest power level described above, even if there is a specific ULPC process (s) applied to each SRS resource unit (group) at the time, when disregarding the specific ULPC process (s), the same power level can be defined as a “preset / pre-configured power level / value” to be applied continuously when (N) SRS resources for specific UL beam management must be transmitted together (and / or a power level / value determined by OLPC (and in association even with specific representative CLPC) in relation to the predefined / pre-configured RS DL and / or specific representative DL DL) at once (substitution) . Here, the specified representative RS DL can include SS block DMRS (server) (i.e., for PBCH) (per initial access channel / random access procedure (RACH) and / or beam management procedure (BM)) and / or specific SSS and / or CSI-RS (for example, lower index). Additional / alternatively, after the power level is equalized, if the power level exceeds a maximum amount of power (for example, P_c_MAX) that can be maximally transmitted, the power level can be configured to be reduced according to a value corresponding constraint at once. Additional / alternatively, if a power sharing rule is defined / configured, which must be applied to signals (for example, PUCCH, PUSCH, etc.) to be transmitted to another specific uplink, the target power level to be reduced can be set to a target power level according to the power sharing rule / to which the power sharing rule is to be applied.
[0449] - Like yet another scheme, when there is at least one specific ULPC process (link adaptation (LA)) that is maintained (activated) (in relation to a specific beam) at the moment, the uplink transmission can be configured to be performed by defining a specific power value by
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92/100 ULPC process as the same power level for the N SRS resources (and / or adding a single power shift configured / indicated to it) at once. In other words, this means that the power level determined by the normal link adaptation ULPC (for example, associated with the PUSC PC) (plus P_SRS_offset) is applied to the transmission of SRS resource (s) for beam management as is and to The same power is also applied to a beam management SRS feature that corresponds to a corresponding (analog) beam pair from the link adaptation SRS feature between them. This is to indicate the transmission of the beam management SRS resources in order to test which beam pair between the beam pairs different from the current server beam pair in a situation where the beam management SRS resources are transmitted. Furthermore, the reason is that it may still be insignificant to configure an individual ULPC process among the (N) SRS beam management features. In summary, the individual ULPC processes can be configured / applied between the link adaptation SRS resource (s), however the individual ULPC processes (or a separate ULPC process from the link adaptation) may not be configured between the resource (s) Beam management SRS. Additional / alternatively, after the power level is equalized, if the power level exceeds a maximum amount of power (for example, P_c_MAX) that can be maximally transmitted, the power level can be configured to be reduced according to a value corresponding constraint at once. Additional / alternatively, if a power sharing rule is defined / configured, which must be applied to signals (for example, PUCCH, PUSCH, etc.) to be transmitted to another specific uplink, the target power level to be reduced can be set to a target power level according to the power sharing rule / to which the power sharing rule is to be applied.
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93/100 [0450] Even when the specific aperiodic SRS trigger state is configured to transmit M (> = 1) specific SRS resources (for CSI acquisition) as well as N specific SRS resources (for beam management) (ie, when the specific aperiodic SRS trigger state is configured to simultaneously transmit a total of N + M SRS resources), at least one of the proposed methods can be applied in such a way that replace N in the schemes proposed above by “N + M”. That is, in this case, even in a case where the SRS resources for different purposes are mixed, as well as a case where only the beam management SRS resources are transmitted together, the SRS resources can be transmitted applying the specific power level (ie, the same specific power) as the method proposed above disregarding (ie, replacing) the situation in which each ULPC process is applied by such a scheme.
[0451] Alternatively, it can be restricted / configured that at least one of the above proposals be applied only to N without replacing N in the proposed schemes with “N + M”, as described above. That is, N + M SRS resources are transmitted together, but only N SRS resources between them can be transmitted applying the specific power level (for example, the same specific power) only to the transmission power for N SRS resources as the proposed method. In addition, simultaneously, M SRS resource (s) can be transmitted while applying the power controlled power level according to the specific ULPC process associated with the corresponding M SRS resources (in advance), respectively to the transmission power of the other M resource ( s) SRS as they are. This can be caused by a difference in the purpose of the SRS transmission.
[0452] Furthermore, in the methods proposed above, it can be interpreted that most of them are described based on a fact that N and / or M SRS resources are
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94/100 types of aperiodic SRS, however it is evident that at least one of the schemes proposed in the present invention above can be applied extensively even in a case where some of them are semi-persistent SRS types and / or periodic SRS types. That is, the scheme can be applied only to the same specific SRS transmission case and even if the multiple specific SRS resources are spread and transmitted to different SRS transmission cases, the SRS transmission can be performed by replacing a part of the power determination transmission by the ULPC interlocking process (s) and applying power control for some multiple SRS resources at the specific power level (eg at the same specific power) (only temporarily / during a specific interval).
[0453] Additionally / alternatively, in relation to at least one proposal method, an operation (this can be interpreted as the power control setting) that performs SRS transmission replacing it with the specific power level (for example, the same specific power) can be temporarily applied only to a specific SRS transmission interval (cycle). That is, in addition, the SRS transmission can be configured to be carried out at another specific specific power level (for example, at the same specific power) in relation to another SRS transmission interval (cycle). The power control adjustment can be performed independently for each specific interval (cycle).
[0454] For example, at least one operation in the method described above can be temporarily applied only to a “one round SRS beam scan” interval. In addition, it is possible to define that at least one operation in the other independent method described above is applied or configured / indicated to the UE by the eNB in relation to the next / other interval of “an SRS beam scan round”.
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95/100 [0455] Figure 13 is a diagram illustrating a method for transmitting and receiving an uplink, according to an embodiment of the present invention.
[0456] With reference to Figure 13, the UE receives SRS configuration control information (DCI) from eNB (S1301).
[0457] Here, the SRS configuration information can include a set of parameters (including, for example, a standard power value P0, a reverse compensation information / ratio α, a downlink reference signal for loss estimation / calculation trajectory, etc.) for SRS power control for each SRS resource set and the SRS resource set can include one or more SRS resources.
[0458] The UE determines the SRS transmission power based on the SRS power control parameter set (S1302).
[0459] Here, the SRS transmission power can be determined based on the downlink path loss estimate value calculated by the UE using the downlink reference signal indicated by the set of parameters for power control of the SRS. In this case, the downlink reference signal can be indicated by the higher layer signaling (RRC or CE MAC). For example, the downlink reference signal can include SSB and CSI-RS.
[0460] In addition, the downlink reference signal can be changed by signaling (eg CE MAC, DCI, etc.) transmitted by eNB.
[0461] Furthermore, the UE can determine the transmission power of the SRS by commonly applying TPC accumulation to a set of SRS resources (for example, for a specific set (group) of SRS resources explicitly / implicitly configured).
[0462] A power control setting to adjust the power of
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96/100 SRS transmission can be applied independently for each specific SRS transmission interval. Here, when the power control setting is triggered, the SRS transmit power values on all SRS resources can be adjusted equally regardless of the determination of the SRS transmit power. Specifically, an operation to perform SRS transmission by substitution at the specific power level (for example, at the same specific power) can be temporarily applied only to a specific SRS transmission interval (cycle). In addition, the SRS transmission can be configured to be performed at another specific specific power level (for example, at the same specific power) in relation to another SRS transmission interval (cycle). In addition, when the adjusted transmission power value exceeds a predetermined value, the adjusted transmission power value can be reduced at once.
[0463] The UE transmits the SRS to the eNB with the determined transmission power (S1303).
[0464] Although not illustrated in Figure 13, an operation to control an operation to transmit an uplink channel (PUSCH and PUCCH) / an operation to control the transmission power of the uplink channel can be performed in conjunction with the operation SRS transmit / receive in Figure 13.
[0465] Specifically, the UE receives downlink control (DCI) information that includes physical uplink shared channel (PUSCH) programming information from the eNB. Here, DCIs can include an SRS resource indicator (SRI). In addition, the UE determines the PUSCH transmission power based on the set of parameters for the PUSCH power control determined from the SRI.
[0466] In this case, the UE can receive from the eNB one or more sets
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97/100 of parameters (for example, a standard power value P0, a reverse compensation information / ratio α, a downlink reference signal to estimate / calculate path loss, etc.) for power control of the PUSCH and calculates the PUSCH transmission power based on the set of parameters indicated by the SRI.
[0467] Furthermore, when a plurality of SRS resources is indicated by the SRI, and different layer groups are configured in relation to the plurality of SRS resources, respectively, the set of parameters for PUSCH power control can be individually determined for each layer group.
[0468] Even in this case, the transmission power of the PUSCH can be determined based on the downlink path loss estimate value calculated by the UE using the downlink reference signal indicated by the set of parameters for the control of PUSCH power. In addition, the downlink reference signal can be altered by signaling (for example, CE MAC, DCI, etc.) transmitted by eNB. In addition, the UE transmits the PUSCH to the eNB with the determined transmission power.
[0469] On the other hand, when information about the downlink reference signal is not provided from the eNB (for example, when the SRI in the DCI is not included), the value of the estimated path loss can be calculated with the use of a specific downlink reference signal (for example, a downlink reference signal that has a relatively higher power level).
Overview of Devices to which the Present Invention is Applicable [0470] Figure 14 is illustrating a block diagram of a wireless communication device, according to one embodiment of the present disclosure.
[0471] With reference to Figure 14, a wireless communication system includes
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98/100 a base station 1410 and multiple UEs 1410 positioned within an area of the base station 1420.
[0472] eNB 1410 includes a 1411 processor, a 1412 memory and a 1413 radio frequency (RF) transceiver or unit. The 1411 processor implements a function, process and / or method that are proposed in Figures 1 to 13 above . The layers of a radio interface protocol can be implemented by the 1411 processor. The 1412 memory is connected to the 1411 processor to store various information to drive the 1411 processor. The RF 1413 unit is connected to the 1411 processor to transmit and / or receive a radio signal.
[0473] The UE 1420 includes a processor 1421, a memory 1422 and an RF unit 1423. The processor 1421 implements a function, a process and / or a method that are proposed in Figures 1 to 13 above. The layers of a radio interface protocol can be implemented by the 1421 processor. The 1422 memory is connected to the 1421 processor to store various information to drive the 1421 processor. The RF 1423 unit is connected to the 1421 processor to transmit and / or receive a radio signal.
[0474] Memories 1412 and 1422 can be positioned inside or outside processors 1411 and 1421 and connected to processors 1411 and 1421 by various well-known means. In addition, the eNB 1410 and / or the UE 1420 can have a single antenna or multiple antennas.
[0475] The modalities described so far are those of the elements and technical resources that are coupled in a predetermined form. As there is no evident mention, each of the elements and technical resources must be considered as selective. Each of the technical elements and resources can be incorporated without being coupled with other technical elements or resources. In addition, it is also possible to construct the modalities of the present invention by coupling
Petition 870190072616, of 7/29/2019, p. 115/138
99/100 if a part of the elements and / or technical resources. The order of operations described in the modalities of the present invention can be changed. A part of the technical elements or resources in one modality can be included in another modality, or can be replaced by the technical elements and resources that correspond to the other modality. It is evident to construct the modality by combining the claims that have no explicit reference to the claims below, or to include the claims in a new claim established by an amendment after the request.
[0476] The modalities of the present invention can be implemented by various means, for example, hardware, firmware, software or a combination thereof. In the case of hardware, a modality of the present invention can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) , field programmable port arrangements (FPGAs), a processor, a controller, a microcontroller, a microprocessor and the like.
[0477] In the case of implementation by firmware or software, a modality of the present invention can be implemented in a form, such as a module, a procedure, a function, and so on that performs the functions or operations described so far. Software codes can be stored in memory and triggered by the processor. The memory can be located inside or outside the processor, and can exchange data with the processor by several known means.
[0478] It will be understood by those skilled in the art that various modifications and variations can be made without departing from the essential resources of the invention. Therefore, the detailed description is not limited to the modalities described above, but should be considered as examples. O
Petition 870190072616, of 7/29/2019, p. 116/138
100/100 scope of the present invention must be determined by reasonably interpreting the appended claims, and any modification within the scope of equivalence must be included in the scope of the present invention.
INDUSTRIAL APPLICABILITY [0479] The present invention has been described based on an example in which it is applied to LTE / LTE-A 3GPP systems or 5G systems, however it can be applicable to several wireless communication systems in addition to LTE / LTE systems -The 3GPP or 5G system.

权利要求:
Claims (12)
[1]
1. Method to carry out uplink transmission by means of User Equipment (UE) in a wireless communication system CHARACTERIZED by the fact that it comprises:
receive, from a base station, configuration information of the Survey Reference Signal (SRS) related to the SRS resources for the UE;
determining, among SRS resources, a plurality of sets of SRS resources, each comprising a plurality of SRS resources;
determine, for each set of SRS resources among the plurality of sets of SRS resources, information related to an SRS power control to be applied to all among the plurality of SRS resources within the set of SRS resources;
determining that an SRS is transmitted to the base station, where the SRS is included in a first set of SRS resources among the plurality of sets of SRS resources;
determine a first transmit power for the SRS, based on information related to the SRS power control that is associated with the first set of SRS features that includes the SRS; and transmit the SRS to the base station using the first transmit power.
[2]
2. Method, according to claim 1, CHARACTERIZED by the fact that the information related to the SRS power control to be applied to all among the plurality of SRS resources within the SRS resource set comprises:
a set of parameters for power control of each set of SRS resources.
[3]
3. Method, according to claim 1, CHARACTERIZED by the fact that
Petition 870190072616, of 7/29/2019, p. 135/138
2/4 that the information related to the SRS power control to be applied to all of the plurality of SRS resources within the SRS resource set are related to an estimate of downlink path loss for a downlink channel.
[4]
4. Method, according to claim 3, CHARACTERIZED by the fact that the downlink path loss estimate for the downlink channel is determined by the UE based on a downlink reference signal comprising a Block of Synchronization Signal (SSB) and a Channel State Information Reference Signal (CSI-RS).
[5]
5. Method, according to claim 4, CHARACTERIZED by the fact that the downlink reference signal is determined by a Control Element for Access Control to the Medium (MAC-CE) that is transmitted by the base station.
[6]
6. Method, according to claim 1, CHARACTERIZED by the fact that the information related to SRS power control to be applied to all among the plurality of SRS resources within the SRS resource set comprises:
information related to an SRS power control process according to which SRS power control is to be performed.
[7]
7. User equipment (UE) configured to carry out uplink transmission in a wireless communication system, the UE being CHARACTERIZED by the fact that it comprises:
a transceiver;
at least one processor; and at least one computer memory operably connectable to at least one processor and store instructions that, when executed, cause at least one processor to perform the operations that comprise:
Petition 870190072616, of 7/29/2019, p. 136/138
3/4 receive, from a base station, configuration information of the Polling Reference Signal (SRS) related to the SRS resources for the UE;
determine, for each set of SRS resources among the plurality of sets of SRS resources, information related to an SRS power control to be applied to all of the plurality of SRS resources within the set of SRS resources;
determining that an SRS is transmitted to the base station, where the SRS is included in a first set of SRS resources among the plurality of sets of SRS resources;
determine a first transmission power for the SRS, based on information related to the SRS power control that is associated with the first set of SRS features that includes the SRS; and transmitting the SRS to the base station via the transceiver using the first transmit power.
[8]
8. UE, according to claim 7, CHARACTERIZED by the fact that the information related to SRS power control to be applied to all among the plurality of SRS resources within the SRS resource set comprises:
a set of parameters for power control of each set of SRS resources.
[9]
9. EU, according to claim 7, CHARACTERIZED by the fact that the information related to SRS power control to be applied to all among the plurality of SRS resources within the SRS resource set are related to a path loss estimate downlink channel to a downlink channel.
[10]
10. UE, according to claim 9, CHARACTERIZED by the fact that the estimated loss of downlink path for the link channel
Petition 870190072616, of 7/29/2019, p. 137/138
4/4 downstream is determined by the UE based on a downlink reference signal comprising a synchronization signal block (SSB) and a channel status information reference signal (CSI-RS).
[11]
11. UE, according to claim 10, CHARACTERIZED by the fact that the downlink reference signal is determined by a control element (CE) for medium access control (MAC) that is transmitted by the base station.
[12]
12. EU, according to claim 7, CHARACTERIZED by the fact that the information related to the SRS power control to be applied to all among the plurality of SRS resources within the SRS resource set comprises:
information related to an SRS power control process according to which SRS power control is to be performed.

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法律状态:
2021-10-13| B350| Update of information on the portal [chapter 15.35 patent gazette]|

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