Method for transmitting channel state information for multi-TRP-based transmission in wireless communication system and apparatus therefor

Abstract

The present disclosure relates to a method performed by a user equipment (UE) in a wireless communication system. In particular, the method comprises the steps of: receiving information on a plurality of measurement resources corresponding to a multi-transmit and receive point (M-TRP) from a base station (BS); calculating channel state information (CSI) related to coherent joint transmission (CJT) based on M-TRP based on the plurality of measurement resources; and transmitting the CSI related to the CJT based on the M-TRP to the BS, in which the number of CSI processing units (CPUs) for calculating the CSI related to the CJT based on the M-TRP is determined based on the number of channel measurement resources (CMRs) among the measurement resources.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and device for sending channel state information for multi-TRP-based transmission in a wireless communication system. Background Art

[0002] Wireless communication systems are widely deployed to provide various types of communication services such as voice and data. Generally, wireless communication systems are multiple access systems that can support communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency division multiple access (SC-FDMA) systems. Summary of the invention

[0003] Technical issues

[0004] Based on the discussion above, a method and device for sending channel state information for multi-TRP-based transmission in a wireless communication system will be proposed hereinafter.

[0005] Those skilled in the art to which the embodiments pertain will understand that the objects that can be achieved using the embodiments are not limited to those specifically described above, and the above and other objects will be more clearly understood from the following detailed description.

[0006] Technical Solution

[0007] In one technical aspect of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system is provided, the method comprising the following steps: receiving information about multiple measurement resources related to a multiple transmit and receive point (M-TRP) from a base station (BS); calculating channel state information (CSI) related to a coherent joint transmission (CJT) based on the M-TRP based on the multiple measurement resources; and sending the CSI related to the M-TRP based CJT to the BS, wherein the number of CSI processing units (CPUs) used to calculate the CSI related to the M-TRP based CJT is determined based on the number of channel measurement resources (CMRs) among the measurement resources.

[0008] In another technical aspect of the present disclosure, a user equipment (UE) in a wireless communication system is provided, the UE comprising: at least one transceiver; at least one processor; and at least one computer memory, which is operably connected to the at least one processor and stores instructions, which, when executed, enable the at least one processor to perform operations, the operations comprising: receiving information about multiple measurement resources related to multiple transmit and receive points (M-TRP) from a base station (BS); calculating channel state information (CSI) related to coherent joint transmission (CJT) based on the M-TRP based on the multiple measurement resources; and sending CSI related to CJT based on the M-TRP to the BS, wherein the number of CSI processing units (CPUs) used to calculate the CSI related to CJT based on the M-TRP is determined based on the number of channel measurement resources (CMRs) among the measurement resources.

[0009] In another technical aspect of the present disclosure, a device for processing in a wireless communication system is provided, the device comprising: at least one processor; and at least one computer memory, which is operably connected to the at least one processor and stores instructions, wherein the instructions, when executed, enable the at least one processor to perform operations for a user equipment (UE), the operations comprising: receiving information about multiple measurement resources related to a multiple transmit and receive point (M-TRP) from a base station (BS); calculating channel state information (CSI) related to a coherent joint transmission (CJT) based on the M-TRP based on the multiple measurement resources; and sending CSI related to the M-TRP based CJT to the BS, wherein the number of CSI processing units (CPUs) used to calculate the CSI related to the M-TRP based CJT is determined based on the number of channel measurement resources (CMRs) among the measurement resources.

[0010] In another technical aspect of the present disclosure, a computer-readable storage medium is provided, which stores at least one program code including instructions, which, when executed, enable at least one processor to perform operations for a user equipment (UE), the operations including: receiving information about multiple measurement resources related to multiple transmit and receive points (M-TRP) from a base station (BS); calculating channel state information (CSI) related to coherent joint transmission (CJT) based on M-TRP based on the multiple measurement resources; and sending CSI related to M-TRP based CJT to the BS, wherein the number of CSI processing units (CPUs) used to calculate CSI related to M-TRP based CJT is determined based on the number of channel measurement resources (CMRs) among the measurement resources.

[0011] In another technical aspect of the present disclosure, a method performed by a base station (BS) in a wireless communication system is provided, the method comprising the following steps: receiving UE capability information related to coherent joint transmission (CJT) based on multiple transmit and receive points (M-TRP) from a user equipment (UE); sending information about multiple measurement resources related to the M-TRP to the UE; and receiving channel state information (CSI) related to the M-TRP-based CJT calculated based on the multiple measurement resources from the UE, wherein the UE capability information includes information about the number of per-channel measurement resources (CMRs) among the measurement resources, the number of CSI processing units (CPUs) that can be supported by the UE, and wherein the number of CPUs used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of CMRs.

[0012] In another technical aspect of the present disclosure, a base station (BS) in a wireless communication system is provided, the BS comprising: at least one transceiver; at least one processor; and at least one computer memory, which is operably connected to the at least one processor and stores instructions, which, when executed, enable the at least one processor to perform operations, the operations comprising: receiving UE capability information related to coherent joint transmission (CJT) based on multiple transmit and receive points (M-TRP) from a user equipment (UE); sending information about multiple measurement resources related to the M-TRP to the UE; and receiving channel state information (CSI) related to CJT based on the M-TRP calculated based on the multiple measurement resources from the UE, wherein the UE capability information includes information about the number of per-channel measurement resources (CMRs) among the measurement resources, the number of CSI processing units (CPUs) that can be supported by the UE, and wherein the number of CPUs used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of CMRs.

[0013] In various aspects of the present disclosure, the number of CPUs used to calculate CSI related to M-TRP-based CJT may be determined based on the number of CMR combinations including at least one CMR and the number of CPUs related to each CMR combination.

[0014] In various aspects of the present disclosure, the number of CPUs used to calculate the M-TRP-based CJT may be determined as (where M is the number of CMRs).

[0015] In various aspects of the present disclosure, the UE may receive a transmission request signal for CSI related to M-TRP-based CJT from the BS, and a first minimum time interval between receiving the transmission request signal and sending the CSI related to M-TRP-based CJT and a second minimum time interval between receiving all measurement resources configured by the BS for reporting CSI related to M-TRP-based CJT and sending the CSI related to M-TRP-based CJT may be determined based on the number of CMRs.

[0016] In various aspects of the present disclosure, the UE may transmit UE capability information related to M-TRP-based CJT to the BS, and the UE capability information may include information on the number of CPUs that can be supported per the number of CMRs.

[0017] In various aspects of the present disclosure, the plurality of measurement resources may further include interference measurement resources (IMRs).

[0018] The above solutions are only some examples of the present disclosure, and those skilled in the art may derive and understand various examples reflecting the technical features of the present disclosure from the following detailed description.

[0019] Beneficial Effects

[0020] According to the present disclosure, wireless signal transmission and reception can be efficiently performed in a wireless communication system.

[0021] Those skilled in the art will understand that the technical effects that can be achieved using the present disclosure are not limited to those specifically described above, and the above and other technical effects that can be achieved by the present disclosure will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are provided to help understand the embodiments and the detailed description. However, the technical features of the embodiments are not limited to specific drawings, and the features disclosed in the various drawings can be combined with each other to form new embodiments. The reference numerals in the various drawings represent structural elements:

[0023] Figure 1 Physical channels used in a 3rd Generation Partnership Project (3GPP) system as an example of a wireless communication system and a general signal transmission method using the same are shown.

[0024] Figure 2 Shows the radio frame structure.

[0025] Figure 3 A resource grid showing time slots.

[0026] Figure 4 An exemplary mapping of physical channels in time slots is shown.

[0027] Figure 5An exemplary process of transmitting a physical downlink shared channel (PDSCH) and acknowledgement / negative acknowledgement (ACK / NACK) is shown.

[0028] Figure 6 An exemplary physical uplink shared channel (PUSCH) transmission process is shown.

[0029] Figure 7 An example of a channel state information (CSI) related process is shown.

[0030] Figure 8 is a flowchart showing an example of sending CSI related to M-TRP-based CJT by a UE according to an embodiment of the present disclosure.

[0031] Figure 9 is a flowchart illustrating an example of receiving, by a BS, CSI related to M-TRP-based CJT according to an embodiment of the present disclosure.

[0032] Figures 10 to 13 A communication system (1) and a wireless device suitable for use with the present disclosure are shown. DETAILED DESCRIPTION

[0033] The techniques described herein can be used for various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate for GSM Evolution (EDGE). OFDMA can be implemented as a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3GPP LTE is part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE uses OFDMA for downlink and SC-FDMA for uplink. LTE-A is the evolution of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0034] As more and more communication devices require greater communication capacity to send and receive signals, there is a need for improved mobile broadband communications relative to traditional radio access technologies. Therefore, communication systems that take into account services / UEs that are sensitive to reliability and latency are being discussed. Next generation radio access technologies that take into account enhanced mobile broadband communications, massive machine type communications (MTC), and ultra-reliable low latency communications (URLLC) may be referred to as new radio access technologies (RATs) or new radios (NRs).

[0035] Although the present disclosure is mainly described in the context of 3GPP NR for clarity of description, the technical concept of the present disclosure is not limited to 3GPP NR.

[0036] In this specification, the expression "setting" may be replaced by the expression "configuration", and the two may be used interchangeably. In addition, conditional expressions (e.g., "if ~~", "in the case of ~~", "when ~~", etc.) may be replaced by expressions "based on ~~" or "in the state of ~~". In addition, the operation or SW / HW configuration of the user equipment (UE) / base station (BS) may be inferred / understood based on the satisfaction of the conditions. In addition, when the processing of the receiving (or transmitting) side can be inferred / understood from the processing of the transmitting (or receiving) side in the signal transmission / reception between wireless communication devices (e.g., BS and UE), its description may be omitted. For example, signal determination / generation / encoding / transmission on the transmitting side may be understood as signal monitoring reception / decoding / determination on the receiving side. In addition, when it is said that the UE performs (or does not perform) a specific operation, this may also be interpreted as meaning that the BS expects / assumes that the UE performs the specific operation (or expects / assumes that the UE does not perform the specific operation) to operate. In addition, when it is said that the BS performs (or does not perform) a specific operation, this can also be interpreted as meaning that the UE expects / assumes that the BS performs the specific operation (or expects / assumes that the BS does not perform the specific operation) to operate. In addition, the identification and indexing of the various sections, implementation methods, examples, options, methods, schemes, etc. in the following description are for convenience of description and should not be interpreted as meaning that each forms an independent disclosure or that each should be implemented separately. In addition, unless there is an explicit conflicting / contrary description when describing the various sections, implementation methods, examples, options, methods, schemes, etc., it can be inferred / interpreted to mean that at least some of them can be implemented in combination together, or they can be implemented by omitting at least some of them.

[0037] In a wireless communication system, a UE receives information from a BS through a downlink (DL) and transmits information to the BS through an uplink (UL). The information transmitted and received by the BS and the UE includes data and various control information, and includes various physical channels according to the type / purpose of the information transmitted and received by the UE and the BS.

[0038] Figure 1The diagram shows physical channels in a 3GPP NR system and a signal transmission method using the physical channels.

[0039] When the UE is powered on or when the UE initially enters a cell, in step S101, the UE performs an initial cell search involving synchronization with the BS. For the initial cell search, the UE receives a synchronization signal block (SSB). The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The UE synchronizes with the BS based on the PSS / SSS and acquires information such as a cell identifier (ID). The UE can then receive broadcast information from the cell on the PBCH. At the same time, the UE can check the downlink channel status by receiving a downlink reference signal (DL RS) during the initial cell search.

[0040] After the initial cell search, the UE may acquire more specific system information by receiving a physical downlink control channel (PDCCH) and receiving a physical downlink shared channel (PDSCH) based on information of the PDCCH in step S102.

[0041] Subsequently, in order to complete the connection with the eNB, the UE may perform a random access procedure with the eNB (S103 to S106). In the random access procedure, the UE may send a preamble on a physical random access channel (PRACH) (S103) and may receive a random access response (RAR) to the preamble on a PDSCH associated with the PDCCH (S104). The UE may use the scheduling information in the RAR to send a physical uplink shared channel (PUSCH) (S105) and perform a contention resolution procedure, including receiving a PDCCH signal and a PDSCH signal corresponding to the PDCCH signal (S106).

[0042] After the above process, the UE may receive PDCCH and / or PDSCH from the eNB (S107) and send a physical uplink shared channel (PUSCH) and / or a physical uplink control channel (PUCCH) to the eNB (S108), which is a general DL and UL signal transmission process. In particular, the UE receives downlink control information (DCI) on the PDCCH. The control information sent from the UE to the eNB is collectively referred to as uplink control information (UCI). UCI includes hybrid automatic repeat and request confirmation / negative determination (HARQ-ACK / NACK), scheduling request (SR), channel state information (CSI), etc. CSI includes channel quality indicator (CQI), precoding matrix indicator (PMI), rank indication (RI), etc. Although UCI is usually sent through PUCCH, it can be sent through PUSCH when control information and service data should be sent simultaneously. In addition, UCI can be sent aperiodically through PUSCH according to the request / instruction of the network.

[0043] Figure 2 The structure of the radio frame is shown. The radio frame can be used for UL transmission and DL transmission in NR. The length of the radio frame is 10ms and can be defined by two 5ms half frames. HF may include five 1ms subframes. The subframe may be divided into one or more time slots, and the number of time slots in the SF may be determined according to the subcarrier spacing (SCS). Depending on the cyclic prefix (CP), each time slot may include 12 or 14 OFDM (A) symbols. In the case of normal CP (NCP), each time slot may include 14 symbols, and in the case of extended CP (ECP), each time slot may include 12 symbols. In this article, the symbol may be an OFDM symbol (or CP-OFDM symbol) or an SC-FDMA symbol (or DFT-s-OFDM symbol).

[0044] Table 1 below lists the number of symbols N per time slot according to SCS configuration μ in the case of NCP slot symb , the number of time slots per frame N frame,u slot and the number of time slots per subframe N subframe,u slot .

[0045] [Table 1]

[0046] SCS(15 * 2^u) <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 15 KHz (u = 0) 14 10 1 30 KHz (u = 1) 14 20 2 60 KHz (u = 2) 14 40 4 120 KHz (u = 3) 14 80 8 240 KHz (u = 4) 14 160 16

[0047] Table 2 below lists the number of symbols N per time slot according to the SCS configuration μ in the case of ECP slot symb , the number of time slots per frame N frame,u slot and the number of time slots per subframe Nsubframe,u slot .

[0048] [Table 2]

[0049] SCS(15 * 2^u) <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 60 KHz (u = 2) 12 40 4

[0050] The structure of the frame is only an example. The number of subframes, the number of time slots, and the number of symbols in a frame may vary.

[0051] In the NR system, OFDM parameter sets (e.g., SCS) may be configured differently for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of a time resource (e.g., SF, time slot, or TTI) (referred to as a time unit (TU) for simplicity) consisting of the same number of symbols may be configured differently between aggregated cells. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol) and an SC-FDMA symbol (or a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol).

[0052] Figure 3 An exemplary resource grid showing the duration of a time slot. A time slot includes multiple symbols in the time domain. For example, in the case of a normal CP, a time slot includes 14 symbols, and in the case of an extended CP, a time slot includes 12 symbols. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) is defined as a plurality of (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) may be defined as a plurality of physical RBs (PRBs) in the frequency domain and corresponds to a parameter set (e.g., SCS, CP length, etc.). A carrier may include up to N (e.g., five) BWPs. Data communication may be performed in an active BWP, and only one BWP may be enabled for a UE. Each element of a resource grid may be referred to as a resource element (RE) and mapped to a complex symbol.

[0053] Figure 4 An example of mapping physical channels in a time slot is shown. PDCCH may be sent in the DL control region, and PDSCH may be sent in the DL data region. PUCCH may be sent in the UL control region, and PUSCH may be sent in the UL data region. GP provides a time gap for switching from a transmit mode to a receive mode or from a receive mode to a transmit mode at the BS and UE. Some symbols within a subframe at a DL to UL switching time point may be configured as GP.

[0054] The individual physical channels are described in more detail below.

[0055] PDCCH transmits DCI. For example, PDCCH (i.e., DCI) may carry information about the transmission format and resource allocation of the DL shared channel (DL-SCH), resource allocation information of the uplink shared channel (UL-SCH), paging information about the paging channel (PCH), system information about DL-SCH, information about resource allocation of high-level control messages (e.g., RAR sent on PDSCH), transmit power control commands, information about the activation / release of the configured scheduling, etc. DCI includes a cyclic redundancy check (CRC). The CRC is masked using various identifiers (IDs) (e.g., radio network temporary identifier (RNTI)) according to the owner or purpose of the PDCCH. For example, if the PDCCH is used for a specific UE, the CRC is masked by the UE ID (e.g., cell-RNTI (C-RNTI)). If the PDCCH is used for a paging message, the CRC is masked by the paging-RNTI (P-RNTI). If the PDCCH is for system information (eg, system information block (SIB)), the CRC is masked by a system information RNTI (SI-RNTI). When the PDCCH is for RAR, the CRC is masked by a random access-RNTI (RA-RNTI).

[0056] The PDCCH includes 1, 2, 4, 8 or 16 control channel elements (CCEs) depending on the aggregation level (AL). CCE is a logical allocation unit for providing a specific code rate to the PDCCH according to the radio channel state. CCE includes 6 resource element groups (REGs). REG is defined as one OFDM symbol and one (P)RB. The PDCCH is transmitted in a control resource set (CORESET). CORESET is defined as a set of REGs with a given parameter set (e.g., SCS, CP length, etc.). Multiple CORESETs for one UE may overlap with each other in the time / frequency domain. CORESET may be configured by system information (e.g., master information block (MIB)) or UE-specific high-level (e.g., radio resource control (RRC) layer) signaling. Specifically, the number of RBs and the number of OFDM symbols (up to 3) included in the CORESET may be configured by high-level signaling.

[0057] For PDCCH reception / detection, the UE monitors PDCCH candidates. PDCCH candidates represent CCEs that the UE should monitor for PDCCH detection. Each PDCCH candidate is defined as 1, 2, 4, 8 or 16 CCEs according to AL. Monitoring includes (blind) decoding of PDCCH candidates. The set of PDCCH candidates monitored by the UE is defined as a PDCCH search space (SS). The SS includes a common search space (CSS) or a UE-specific search space (USS). The UE can acquire DCI by monitoring PDCCH candidates in one or more SSs configured by MIB or high-level signaling. Each CORESET is associated with one or more SSs, and each SS is associated with a COREST. SS can be defined based on the following parameters.

[0058] -controlResourceSetId: indicates the CORESET associated with the SS

[0059] -monitoringSlotPeriodicityAndOffset: indicates PDCCH monitoring periodicity (time slot) and PDCCH monitoring period offset (time slot)

[0060] -monitoringSymbolsWithinSlot: indicates the PDCCH monitoring symbols within the slot (e.g., the first symbol of CORESET)

[0061] -nrofCandidates: AL = {1,2,4,8,16} indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6 and 8)

[0062] * A timing (eg, time / frequency resource) at which a PDCCH candidate is to be monitored is defined as a PDCCH (monitoring) timing. One or more PDCCH (monitoring) timings may be configured within a time slot.

[0063] Table 3 shows the characteristics of each SS type.

[0064] [Table 3]

[0065]

[0066] Table 4 shows the DCI format transmitted on the PDCCH.

[0067] [Table 4]

[0068] DCI format Usage 0_0 Scheduling of PUSCH in a cell 0_1 Scheduling of PUSCH in a cell 1_0 Scheduling of PDSCH in a cell 1_1 Scheduling of PDSCH in a cell 2_0 Notifying a group of UEs of the time slot format 2_1 Notifying a group of UEs that the UEs can assume that there is no transmission of PRBs and OFDM symbols intended for that UE 2_2 Transmitting TPC commands for PUCCH and PUSCH 2_3 Transmitting a set of TPC commands for SRS transmission to one or more UEs

[0069] DCI format 0_0 can be used to schedule TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​can be used to schedule TB-based (or TB-level) PUSCH or code block group (CBG)-based (or CBG-level) PUSCH. DCI format 1_0 can be used to schedule TB-based (or TB-level) PDSCH, and DCI format 1_1 can be used to schedule TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH (or DL ​​grant DCI). DCI format 0_0 / 0_1 can be referred to as UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 can be referred to as DL grant DCI or DL ​​scheduling information. DCI format 2_0 is used to transmit dynamic time slot format information (e.g., dynamic SFI) to the UE, and DCI format 2_1 can be used to transmit DL preemption information to the UE. DCI format 2_0 and / or DCI format 2_1 can be sent to UEs in the group via a group common PDCCH (a PDCCH transmitted to UEs defined as a group).

[0070] DCI format 0_0 and DCI format 1_0 may be referred to as fallback DCI formats, while DCI format 0_1 ​​and DCI format 1_1 may be referred to as non-fallback DCI formats. Under the fallback DCI format, the DCI size / field configuration remains the same regardless of the UE configuration. In contrast, under the non-fallback DCI format, the DCI size / field configuration varies according to the UE configuration.

[0071] The PDSCH carries DL data (e.g., DL-SCH transport block (DL-SCH TB)), and modulation schemes such as quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (16QAM), 64QAM, 256QAM, etc. are applied to the PDSCH. The TB is encoded to generate a codeword. The PDSCH can carry up to two codewords. Each codeword can be subjected to scrambling and modulation mapping, and the modulation symbol generated from the codeword can be mapped to one or more layers. Each layer is mapped to a resource together with a demodulation reference signal (DMRS), generated as an OFDM symbol signal and sent through a corresponding antenna port.

[0072] PUCCH carries UCI. UCI includes the following information.

[0073] -SR (Scheduling Request): Information used to request UL-SCH resources

[0074] -HARQ (Hybrid Automatic Repeat Request)-ACK (Acknowledgement): A response to a DL data packet (e.g., codeword) on the PDSCH. This indicates whether the DL data packet was successfully received. One HARQ-ACK bit may be sent in response to a single codeword, and two HARQ-ACK bits may be sent in response to two codewords. The HARQ-ACK response includes a positive ACK (abbreviated as ACK), a negative ACK (NACK), DTX, or NACK / DTX. HARQ-ACK may be used interchangeably with HARQ ACK / NACK and ACK / NACK.

[0075] -CSI (Channel State Information): Feedback information of DL channels. Multiple Input Multiple Output (MIMO) related feedback information includes RI and PMI.

[0076] Table 5 shows an exemplary PUCCH format. Based on PUCCH transmission duration, the PUCCH format may be divided into short PUCCH (formats 0 and 2) and long PUCCH (formats 1, 3, and 4).

[0077] [Table 5]

[0078]

[0079] PUCCH format 0 carries up to 2 bits of UCI and is mapped and sent based on a sequence. Specifically, the UE sends one of multiple sequences through the PUCCH of PUCCH format 0 to send specific UCI to the BS. Only when a positive SR is sent, the UE sends the PUCCH of PUCCH format 0 in the PUCCH resources configured for the corresponding SR.

[0080] PUCCH format 1 carries up to 2 bits of UCI, and modulation symbols are spread in the time domain with an orthogonal cover code (OCC) (configured differently depending on whether frequency hopping is performed). DMRS is transmitted in symbols that do not carry modulation symbols (ie, transmitted in time division multiplexing (TDM)).

[0081] PUCCH format 2 carries more than 2 bits of UCI, and the modulation symbols are sent with frequency division multiplexing (FDM) using DMRS. DMRS are located in symbol indexes #1, #4, #7, and #10 within a given RB at a density of 1 / 3. Pseudo-noise (PN) sequences are used for DMRS sequences. For 2-symbol PUCCH format 2, frequency hopping can be enabled.

[0082] In PUCCH format 3, UEs do not multiplex within the same PRBS and transmit UCI of more than 2 bits. In other words, PUCCH resources of PUCCH format 3 do not include OCC. Modulation symbols are transmitted in TDM using DMRS.

[0083] PUCCH format 4 supports multiplexing of up to 4 UEs in the same physical RS and carries more than 2 bits of UCI. In other words, the PUCCH resource of PUCCH format 3 includes OCC. The modulation symbols are transmitted in TDM using DMRS.

[0084] At least one of the one or more cells configured to the UE may be configured for PUCCH transmission. At least the primary cell may be configured as a cell for PUCCH transmission. Based on at least one cell configured for PUCCH transmission, at least one PUCCH cell group may be configured for the UE, and each PUCCH cell group includes one or more cells. The PUCCH cell group may be referred to as a PUCCH group for short. PUCCH transmission may be configured not only for the primary cell but also for the Scell, and the primary cell belongs to the primary PUCCH group, while the PUCCH-SCell configured for PUCCH transmission belongs to the secondary PUCCH group. The PUCCH on the primary cell may be used for cells belonging to the primary PUCCH group, and the PUCCH on the PUCCH-SCell may be used for cells belonging to the secondary PUCCH group.

[0085] The PUSCH carries UL data (e.g., UL-SCH TB) and / or UCI, and is transmitted based on a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, when transform precoding is not possible (e.g., transform precoding is disabled), the UE may transmit the PUSCH based on the CP-OFDM waveform, and when transform precoding is possible (e.g., transform precoding is enabled), the UE may transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH transmission may be dynamically scheduled by a UL grant in the DCI, or semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or layer 1 (L1) signaling (e.g., PDCCH)). PUSCH transmission may be performed in a codebook-based or non-codebook-based manner.

[0086] Figure 5 ACK / NACK transmission processing is shown. Figure 5 , the UE may detect the PDCCH in slot #n. The PDCCH includes DL scheduling information (e.g., DCI format 1_0 or DCI format 1_1). The PDCCH indicates DL assignment with PDSCH offset K0 and PDSCH with HARQ-ACK report offset K1. For example, DCI format 1_0 or DCI format 1_1 may include the following information.

[0087] - Frequency domain resource assignment: indicates the RB set assigned to PDSCH.

[0088] - Time domain resource assignment: Indicates K0 (e.g., slot offset), the starting position of the PDSCH in slot #n+K0 (e.g., OFDM symbol index), and the length of the PDSCH (e.g., number of OFDM symbols)

[0089] -PDSCH-to-HARQ_feedback timing indicator: indicates K1

[0090] -HARQ process number (4 bits): indicates the HARQ process identifier (ID) of the data (e.g., PDSCH or TB)

[0091] -PUCCH resource indicator (PRI): indicates the PUCCH resource to be used for UCI transmission among multiple PUCCH resources in a PUCCH resource set

[0092] Subsequently, the UE may receive the PDSCH from time slot #(n+K0) according to the scheduling information in time slot #n. Upon completion of PDSCH reception in time slot #n1 (where n+K0≤n1), the UE may send UCI via PUCCH in time slot #(n1+K1). The UCI may include a HARQ-ACK response to the PDSCH. Figure 5 In the example, it is assumed for convenience that the SCS of the PDSCH and the SCS of the PUCCH are the same and slot #n1=slot #n+K0, but the present disclosure is not limited thereto. When the SCSs are different, K1 may be indicated / interpreted based on the SCS of the PUCCH.

[0093] When the PDSCH is configured to send at most one TB, the HARQ-ACK response may include one bit. When the PDSCH is configured to send at most two TBs, the HARQ-ACK response may include two bits if spatial bundling is not configured and one bit if spatial bundling is configured. When the HARQ-ACK transmission time for multiple PDSCHs is specified as time slot #(n+K1), the UCI sent in time slot #(n+K1) includes HARQ-ACK responses for multiple PDSCHs.

[0094] Whether the UE should perform spatial bundling for the HARQ-ACK response may be configured for each cell group (e.g., via RRC / high-layer signaling). For example, spatial bundling may be configured separately for each HARQ-ACK response sent via PUCCH and / or each HARQ-ACK response sent via PUSCH.

[0095] When the maximum number of TBs (or codewords) that can be received at one time (or can be scheduled by one DCI) in the corresponding serving cell is 2 (or greater) (for example, when the high-level parameter maxNrofCodeWordsScheduledByDCI corresponds to 2 TBs), spatial bundling can be supported. In addition, more than four layers can be used for 2TB transmission, and at most four layers can be used for 1TB transmission. As a result, when spatial bundling is configured for the corresponding cell group, spatial bundling can be performed for the serving cells in the cell group that can schedule more than four layers. On the serving cell, a UE that wants to send a HARQ-ACK response through spatial bundling can generate a HARQ-ACK response by performing a bit-by-bit logical AND operation on the A / N bits of multiple TBs.

[0096] For example, assuming that a UE receives a DCI that schedules two TBs and receives the two TBs through a PDSCH based on the DCI, the UE that performs spatial bundling can generate a single A / N bit by performing a logical AND operation on a first A / N bit of a first TB and a second A / N bit of a second TB. As a result, when both the first TB and the second TB are ACK, the UE reports an ACK bit value to the BS, and when either TB is NACK, the UE reports a NACK bit value to the BS.

[0097] For example, when only one TB is actually scheduled in a serving cell configured to receive two TBs, the UE may generate a single A / N bit by performing a logical AND operation on the A / N bits of the one TB and a bit value 1. As a result, the UE reports the A / N bits of the one TB to the BS as is.

[0098] There are multiple parallel DL HARQ processes for DL ​​transmission in the BS / UE. Multiple parallel HARQ processes allow DL transmission to be performed continuously while the BS waits for HARQ feedback on successful or unsuccessful reception of the previous DL transmission. Each HARQ process is associated with a HARQ buffer of the medium access control (MAC) layer. Each DL HARQ process manages state variables such as the number of transmissions of the MAC physical data block (PDU) in the buffer, the HARQ feedback for the MAC PDU in the buffer, and the current redundancy version. Each HARQ process is identified by a HARQ process ID.

[0099] Figure 6 An exemplary PUSCH transmission process is shown. Figure 6 , the UE may detect the PDCCH in slot #n. The PDCCH may include UL scheduling information (eg, DCI format 0_0 or DCI format 0_1). DCI format 0_0 or DCI format 0_1 ​​may include the following information.

[0100] - Frequency domain resource assignment: indicates the RB set allocated to PUSCH.

[0101] -Time domain resource assignment: Specify the slot offset K2 indicating the starting position (eg, symbol index) and the length of the PUSCH in the slot (eg, the number of OFDM symbols). The starting symbol and length of the PUSCH may be indicated by a start and length indicator value (SLIV) or separately.

[0102] Then, the UE may transmit the PUSCH in slot #(n+K2) according to the scheduling information in slot #n. The PUSCH includes the UL-SCH TB.

[0103] CSI-related operations

[0104] In NR systems, CSI-RS (Channel State Information-Reference Signal) is used for time and / or frequency tracking, CSI calculation, L1 (Layer 1)-RSRP (Reference Signal Received Power) calculation and mobility. Here, CSI calculation is related to CSI acquisition, and L1-RSRP calculation is related to beam management (BM).

[0105] CSI (Channel State Information) generally refers to information that may indicate the quality of a radio channel (or link) formed between a UE and an antenna port.

[0106] Figure 7 An example of a CSI-related process is shown.

[0107] The UE receives CSI-related configuration information from the BS via RRC signaling (710). The CSI-related configuration information may include at least one of channel state information-interference measurement (CSI-IM) related information, CSI measurement related information, CSI resource configuration related information, CSI-RS resource related information, or CSI report configuration related information.

[0108] -CSI-IM resources may be configured for interference measurement (IM) of the UE. In the time domain, the CSI-IM resource set may be configured as periodic, semi-persistent, or aperiodic. The CSI-IM resources may be configured as zero power (ZP)-CSI-RS of the UE. The ZP-CSI-RS may be configured to be distinguished from the non-zero power (NZP)-CSI-RS.

[0109] - The UE may assume that the CSI-RS resources for channel measurement and the CSI-IM / NZP CSI-RS resources for interference measurement configured for one CSI report have a QCL relationship with respect to the "QCL-TypeD" of each resource (when the NZP CSI-RS resources are used for interference measurement).

[0110] - The CSI resource configuration may include at least one of a CSI-IM resource for interference measurement, an NZP CSI-RS resource for interference measurement, and an NZP CSI-RS resource for channel measurement. The channel measurement resource (CMR) may be an NZP CSI-RS for CSI acquisition, and the interference measurement resource (IMR) may be an NZP CSI-RS for CSI-IM and IM.

[0111] -CSI-RS can be configured for one or more UEs. Different CSI-RS configurations can be provided for each UE, or the same CSI-RS configuration can be provided to multiple UEs. CSI-RS can support up to 32 antenna ports. CSI-RS corresponding to N (N is 1 or greater) antenna ports can be mapped to N RE positions within a time-frequency unit corresponding to one time slot and one RB. When N is 2 or greater, N-port CSI-RS can be multiplexed by CDM, FDM and / or TDM methods. CSI-RS can be mapped to the remaining REs except for REs mapped with CORESET, DMRS and SSB. In the frequency domain, CSI-RS can be configured for the entire bandwidth, a partial bandwidth part (BWP) or a partial bandwidth. CSI-RS can be sent in each RB within the bandwidth in which CSI-RS is configured (ie, density = 1), or CSI-RS can be sent in every two RBs (eg, even or odd RBs) (ie, density = 1 / 2). When CSI-RS is used as a tracking reference signal (TRS), a single-port CSI-RS may be mapped on three subcarriers in each resource block (i.e., density = 3). One or more CSI-RS resource sets may be configured for a UE in the time domain. Each CSI-RS resource set may include one or more CSI-RS configurations. Each CSI-RS resource set may be configured as periodic, semi-persistent, or aperiodic.

[0112] -CSI report configuration may include configuration of feedback type, measurement resources, report type, etc. NZP-CSI-RS resource set may be used for CSI report configuration of corresponding UE. NZP-CSI-RS resource set may be associated with CSI-RS or SSB. Multiple periodic NZP-CSI-RS resource sets may be configured as TRS resource sets. (i) Feedback type includes channel quality indicator (CQI), precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), SSB resource block indicator (SSBRI), layer indicator (LI), rank indicator (RI), first layer (L1)-reference signal received strength (RSRP), etc. (ii) Measurement resources may include configuration of downlink signals and / or downlink resources on which UE performs measurements to determine feedback information. Measurement resources may be configured as ZP and / or NZP CSI-RS resource sets associated with CSI report configuration. NZP CSI-RS resource sets may include CSI-RS sets or SSB sets. For example, L1-RSRP may be measured for a CSI-RS set or an SSB set. (iii) The report type may include the time at which the UE performs the report and the configuration of the uplink channel. The reporting time may be configured as periodic, semi-persistent, or aperiodic. Periodic CSI reports may be sent on the PUCCH. Semi-persistent CSI reports may be sent on the PUCCH or PUSCH based on a MAC CE indicating enable / disable. Aperiodic CSI reports may be indicated by DCI signaling. For example, the CSI request field of an uplink grant may indicate one of various report trigger sizes. Aperiodic CSI reports may be sent on the PUSCH.

[0113] (i) Feedback types may include CQI (channel quality indicator), PMI (precoding matrix indicator), CRI (CSI-RS resource indicator), SSBRI (SS / PBCH block resource indicator), LI (layer indicator), RI (rank indicator), L1-RSRP and / or L-SINR, etc.

[0114] (ii) The measurement resource may include a configuration of a downlink signal and / or downlink resource to be measured by the UE to determine the feedback information. The measurement resource may be configured as a ZP and / or NZP-CSI-RS resource set associated with the CSI report configuration. The NZP-CSI-RS resource set may include a CSI-RS set or an SSB set. For example, L1-RSRP may be measured for a CSI-RS set, or may be measured for an SSB set.

[0115] (iii) The report type may include the configuration of the timing point at which the UE performs reporting, the uplink channel, etc. The reporting timing point may be configured periodically, semi-permanently, or aperiodically. Periodic CSI reports may be sent on the PUCCH. Semi-permanent CSI reports may be sent on the PUCCH or PUSCH based on a MAC CE indicating activation / deactivation. Aperiodic CSI reports may be indicated by DCI signaling. For example, the CSI request field of an uplink grant may indicate one of various report trigger sizes. Aperiodic CSI reports may be sent on the PUSCH.

[0116] The UE measures the CSI based on the configuration information related to the CSI. The CSI measurement may include receiving a CSI-RS (720) and acquiring the CSI by calculating the received CSI-RS (730).

[0117] The UE may send a CSI report to the BS (740). For the CSI report, time resources and frequency resources available to the UE are controlled by the BS. The channel state information (CSI) includes at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), a SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), L1-RSRP, and / or L-SINR.

[0118] The time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic. i) Periodic CSI reporting is performed in short PUCCH and long PUCCH. The periodicity and slot offset of periodic CSI reporting can be configured by RRC, and refer to CSI-ReportConfig IE. ii) SP (semi-periodic) CSI reporting is performed in short PUCCH, long PUCCH or PUSCH. For SP CSI in short / long PUCCH, the periodicity and slot offset are configured by RRC, and CSI reporting is enabled / disabled through a separate MAC CE / DCI. For SP CSI in PUSCH, the periodicity of SP CSI reporting is configured by RRC, but the slot offset is not configured by RRC and SP CSI reporting is enabled / disabled by DCI (format 0_1). For SP CSI reporting in PUSCH, a separate RNTI (SP-CSI C-RNTI) is used. The initial CSI report timing follows the PUSCH time domain allocation value indicated by DCI, and subsequent CSI report timing follows the periodicity configured by RRC. DCI format 0_1 ​​may include a CSI request field and enable / disable a specific configured SP-CSI triggering state. SP CSI reporting has the same or similar enable / disable mechanism as with data transmission in SPS PUSCH. iii) Aperiodic CSI reporting is performed in PUSCH and triggered by DCI. In this case, information related to the triggering of aperiodic CSI reporting may be transmitted / indicated / configured via MAC-CE. For AP CSI with AP CSI-RS, the AP CSI-RS timing is configured by RRC and the timing of the AP CSI report is dynamically controlled by DCI.

[0119] QCL (Quasi-Co-Location)

[0120] Two antenna ports are quasi-colocated when the channel properties of an antenna port can be derived from the channel of another antenna port. The channel properties may include one or more of delay spread, Doppler spread, frequency / Doppler shift, average received power, receive timing / average delay, and spatial RX parameters.

[0121] A list of multiple TCI state configurations can be configured to the UE through the high-level parameter PDSCH-Config. Each TCI state is associated with a QCL configuration parameter between one or two DL RSs and the DMRS port of the PDSCH. The QCL may include qcl-Type1 for the first DS RS and qcl-Type2 for the second DL RS. The QCL type may correspond to one of the following types.

[0122] - "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}

[0123] - "QCL-TypeB": {Doppler shift, Doppler spread}

[0124] - "QCL-TypeC": {Doppler shift, average delay}

[0125] - "QCL-TypeD": {spatial Rx parameters}

[0126] Beam Management (BM)

[0127] BM is a series of processes for acquiring and maintaining a set of BS (or transmission and reception point (TRP)) beams and / or UE beams that can be used for DL ​​and UL transmission / reception. BM may include the following processes and terms.

[0128] -Beam measurement: The BS or UE measures the characteristics of the received beamformed signal.

[0129] -Beam determination: The BS or UE selects its transmit (Tx) beam / receive (Rx) beam.

[0130] - Beam sweeping: Covering the spatial domain using a Tx beam and / or an Rx beam in a predetermined manner during a predetermined time interval.

[0131] -Beam reporting: The UE reports information about the beamformed signal based on beam measurements.

[0132] BM processing may be divided into (1) DL BM processing using SSB or CSI-RS and (2) UL BM processing using a sounding reference signal (SRS). In addition, each BM processing may include Tx beam sweeping for determining a Tx beam and Rx beam sweeping for determining an Rx beam.

[0133] The DL BM process may include (1) beamforming DL RS (eg, CSI-RS or SSB) transmission from the BS and (2) beam reporting from the UE.

[0134] The beam report may include a preferred DL RS ID and a reference signal received power (RSRP) corresponding to the DL RS ID. The DL RS ID may be a SSB resource indicator (SSBRI) or a CSI-RS resource indicator (CRI).

[0135] M-TRP (Multi-Transmit and Receive Point) transmission

[0136] NR Release 17 supports M-TRP PDCCH repetition transmission, M-TRP PDCCH / PDSCH SFN transmission, S-DCI-based M-TRP PUSCH repetition transmission, and M-TRP PUCCH repetition transmission based on a single PUCCH resource.

[0137] In all these transmission techniques, the same content (i.e., DCI, UL TB, or UCI) is repeatedly transmitted with URLLC target enhancement in order to increase reliability. The repetition transmission is performed with TDM or FDM in the case of M-TRP PDCCH repetition transmission, the repetition transmission is performed in the same time / frequency / layer in the case of M-TRP PDCCH / PDSCH SFN transmission, the repetition transmission is performed with TDM in the case of M-TRP PUSCH repetition transmission based on S-DCI, and the repetition transmission is performed with TDM in the case of M-TRPPUCCH repetition transmission based on a single PUCCH resource.

[0138] -M-TRP PDCCH repeated transmission based on S-DCI

[0139] In NR Release 17, for M-TRP PDCCH repeated transmission, multiple CORESETs configured with different TCI states (i.e., different QCL RSs) are configured for the UE, and multiple SS sets connected to the CORESETs are configured. The BS indicates / configures the link between the SS set connected to one CORESET and the SS set connected to another CORESET to / for the UE for repeated transmission, so that the UE can know that the PDCCH candidates of the SS set are repeatedly sent.

[0140] For example, two CORESETs, CORESET#0 and CORESET#1, may be configured for the UE, which are connected to SS sets #0 and #1, respectively, and SS set #0 and SS set #1 may be linked. The UE may know that the same DCI is repeatedly transmitted on the PDCCH candidate of SS set #0 and the PDCCH candidate of SS set #1, and through a specific rule, a specific PDCCH candidate of SS set #0 and a specific PDCCH candidate of SS set #1 are a pair configured for repeated transmission of the same DCI. The two PDCCH candidates are called linked PDCCH candidates, and when the UE successfully receives either of the two PDCCH candidates, the UE may successfully decode the DCI. However, when receiving PDCCH candidates of SS set #0, the UE uses the QCL RS (i.e., DL beam) of the TCI state connected to CORESET #0 of SS set #0, and when receiving PDCCH candidates of SS set #1, it uses the QCL RS (i.e., DL beam) of the TCI state connected to CORESET #1 of SS set #1, so that the UE receives the linked PDCCH candidates in different beams.

[0141] -M-TRP SFN PDCCH

[0142] As a special case of M-TRP PDCCH repetitive transmission, multiple TRPs can repeatedly send the same DCI over the same time / frequency / DM-RS port, which can be called SFN PDCCH transmission. However, for SFN PDCCH transmission, the BS configures multiple TCI states for one CORESET (rather than multiple CORESETs with different TCI states). When the UE receives a PDCCH candidate in the SS set connected to this one CORESET, it performs channel estimation on the PDCCH DM-RS and attempts to decode the PDCCH DM-RS using all these multiple TCI states.

[0143] -M-TRP SFN PDSCH

[0144] In the above-mentioned M-TRP PDSCH repetition transmission, the two TRPs repeatedly send the corresponding channels in different resources. However, in special cases, when the two TRPs use the same resources, that is, even when the same channel is repeatedly sent in the same frequency, time and layer (or DM-RS port), the reliability of the channel can be improved. In this case, the repeatedly transmitted same channels are combined and received in the air because their resources are not distinguished. Therefore, from the perspective of the receiver, they are identified as one channel. In the NR standard, for PDSCH SFN transmission, two DL TCI states can be configured for PDSCH DM-RS reception.

[0145] -M-TRP PUSCH repeated transmission based on S-DCI

[0146] For S-DCI-based M-TRP PUSCH transmission, the BS configures two SRS sets for the UE, and the SRS sets are used to indicate the UL transmission port and UL beam / QCL information of TRP#1 and TRP#2, respectively. In addition, the BS may indicate the SRS resources of the corresponding SRS set through two SRI fields in one DCI, and indicate up to two power control (PC) parameter sets. For example, the first SRI field may indicate the SRS resources and PC parameter set defined for set 0, and the second SRI field may indicate the SRS resources and PC parameter set defined for set 1.

[0147] The UE receives an indication of the UL Tx port, PC parameter set, and UL beam / QCL information for TRP#1 through the first SRI field, and performs PUSCH transmission in the TO corresponding to SRS set #0. Similarly, the UE receives an indication of the UL Tx port, PC parameter set, and UL beam / QCL information for TRP#2 through the second SRI field, and performs PUSCH transmission in the TO corresponding to SRS set #1.

[0148] -M-TRP PUCCH repetitive transmission based on a single PUCCH resource

[0149] For M-TRP PUCCH transmission based on a single PUCCH resource, the BS enables / configures two spatial relationship information for a single PUCCH resource for the UE, and when the UE sends UCI in the PUCCH resource, the spatial relationship information is used to indicate the spatial relationship information of TRP#1 and TRP#2 respectively.

[0150] For example, the UE receives an indication of the Tx beam / PC parameters for TRP#1 through the value indicated by the first spatial relationship information, and uses the information to perform PUCCH transmission in the TO corresponding to TRP#1. Similarly, the UE receives an indication of the Tx beam / PC parameters for TRP#2 through the value indicated by the second spatial relationship information, and uses the information to perform PUCCH transmission in the TO corresponding to TRP#2.

[0151] In the Rel 17 standardization meeting, the configuration method is enhanced so that two spatial relationship information can be configured for PUCCH resources for M-TRP PUCCH repeated transmission. That is, when the PC parameters are set in each spatial relationship information, the spatial relationship RS can be configured. As a result, the PC information and spatial relationship RS information corresponding to the two TRPs can be configured through the two spatial relationship information, and the UE uses the first spatial relationship information to send UCI in TO 1 through PUCCH, and uses the second spatial relationship information to send the same UCI (i.e., CSI, ACKNAK, SR) in TO 2 through PUCCH.

[0152] In the following, a PUCCH resource configured with two spatial relationship information is referred to as an M-TRP PUCCH resource, and a PUCCH resource configured with one spatial relationship information is referred to as an S-TRP PUCCH resource.

[0153] Meaning of TCI state / beam indication

[0154] Using or mapping a specific TCI state (or TCI) when receiving data / DCI / UCI in a specific frequency / time / space resource may mean that in DL, the QCL type and QCL RS indicated by the DL TCI state are used to estimate the channel from the DM-RS in the frequency / time / space resource, and data / DCI is received / demodulated based on the estimated channel.

[0155] In UL, it may mean sending / modulating DM-RS and data / UCI in frequency / time / space resources using the Tx beam and / or Tx power indicated by the UL TCI state.

[0156] The UL TCI state includes information about a Tx beam or Tx power for the UE, which may be configured for the UE through other parameters such as spatial relationship information (rather than the TCI state).

[0157] The UL TCI state may be directly indicated by the DCI carrying the UL grant, or may mean the spatial relationship information of the SRS resource indicated by the SRI field in the UL grant DCI. Alternatively, it may mean the open-loop Tx power control parameter linked to the value indicated by the SRI field in the UL grant DCI. Alternatively, the UL TCI may be indicated by the DL grant DCI.

[0158] <M-TRP SFN-related description - Common layer NCJT>

[0159] In the 3GPP NR Release 17 standard, an SFN transmission method is being discussed in which M-TRP sends the same data together through the same layer and the same DM-RS port for the same time / frequency region. For example, in single-layer M-TRP SFN transmission, TRP 1 and TRP 2 use the same DM-RS port and the same time / frequency resources to send the same data to the UE. In this case, the DL QCL beam information of the DM-RS (i.e., the QCL reference RS defined in the TCI state) is configured for each TRP, so the DM-RS port receives two configurations of the QCL beam information of TRP 1 and the QCL beam information of TRP 2.

[0160] Since the same data transmitted by two TRPs is received through one DM-RS port, the channel estimated through the DM-RS port becomes a composite channel combining the downlink channel of TRP 1 and the downlink channel of TRP 2, and the composite channel appears as constructive or destructive and random because the channel phases of the TRPs are not aligned with each other. From this perspective, SFN transmission can be said to be a kind of M-TRP NCJT. In addition, since M-TRP transmits a common layer, it is called common layer NCJT.

[0161] <M-TRP NCJT - Independent layer NCJT>

[0162] In addition, the two TRPs use different layers and different DM-RS ports to send different data. For example, when DM-RS ports belonging to different CDM groups are grouped, the DM-RS ports belonging to the first CDM group are received using the first QCL beam information (i.e., indicating the first TCI state) and the DM-RS ports belonging to the second CDM group are received using the second QCL beam information (i.e., indicating the second TCI state). Therefore, since the layers / DM-RS ports sent by the two TRPs are separated from each other and data is not sent / received through a synthetic channel, there is no need to align the channel phases of the two TRPs. This is called non-coherent JT. In addition, since each TRP sends an independent layer, it is also called independent layer NCJT.

[0163] <M-TRP CJT>

[0164] Similar to M-TRP SFN, M-TRP CJT allows M-TRP to send the same data together through the same layer and the same DM-RS port for the same time / frequency region. However, unlike M-TRP SFN, since M-TRP CJT does not require the channel phases of the TRPs to be aligned with each other, when the two channels ideally become destructive sums to form a composite channel, the resulting SNR gain obtained through beamforming is higher than SFN. The UE can add the phase difference between the two TRP channels to the existing CSI for feedback so that the channel phases of the TRPs can be aligned together. In addition, when data is sent on multiple layers, some layers can perform CJT transmission, but some layers may support the case of only one TRP transmission. For example, when rank 2 PDSCH transmission is performed, since TRP 1 and TRP 2 perform CJT, both TRPs send the same data on the first layer. Then, only TRP 1 can send data on the second layer.

[0165] For CSI feedback of CJT transmission (i.e., CSI in which the downlink channels of each TRP have a common phase (co-phase)), the base station (BS) can configure CMR and CSI content to the UE in the following method to measure the channels of the two TRPs.

[0166] In the first method, one CSI-RS is configured as a CMR, but some ports of the CSI-RS may be sent by TRP 1 and the rest may be sent by TRP 2. When using this method, the QCL beam (or QCL reference RS or TCI state defined in the TCI state) information of TRP 1 is configured for some ports of the CSI-RS, and the QCL beam (or QCL reference RS or TCI state defined in the TCI state) information of TRP 2 is configured for other ports. The UE measures the channel using the corresponding CMR to estimate the channels of the transmission antenna ports totaling [the number of ports of TRP 1 + the number of ports of TRP 2], and then calculates the PMI of the ports totaling [the number of ports of TRP 1 + the number of ports of TRP 2]. The calculated PMI reflects the optimal common phase between the ports of TRP 1 and the ports of TRP 2, and the calculated RI / PMI / CQI is fed back to the base station.

[0167] In the second method, two CMRs are configured, CMR 1 configures CSI-RS1 sent by TRP 1, and CMR 2 configures CSI-RS2 sent by TRP2. The UE can estimate the channel of TRP 1 and the channel of TRP 2 respectively by measuring the channel using the corresponding CMR, and generate the entire channels of TRP 1 and TRP 2 by cascading the estimated channels. For example, the 2-port channel of TRP 1 is estimated using CMR1, the 2-port channel of TRP 2 is estimated using CMR2, and then a 4-port channel is generated by cascading them. RI / PMI / CQI is calculated for the generated channel and fed back to the base station.

[0168] In the third method, two CMRs are configured in the same manner as in the second method. Unlike the second method, the UE does not concatenate channels measured using corresponding CMRs. RI1 / PMI1 is calculated from the channel of CMR 1, RI2 / PMI2 is calculated from the channel of CMR 2, and a common phase between the corresponding channels is calculated. In addition, the CQI achievable during CJT PDSCH transmission is calculated by applying RI1 / RI2 / PMI2 / common phase / common amplitude (common amplitude), and all of them are fed back.

[0169] Method for determining the number of CPUs for CJT CSI

[0170] According to the existing NR standard, one CSI-RS resource used for channel measurement occupies one CPU. In the following, when a CMR corresponding to an M-TRP is configured for a UE to calculate a CJT CSI, a method for determining the number of CPUs corresponding to the CSI is proposed.

[0171] For example, the base station configures M CMRs corresponding to M TRPs for the UE (each CMR is configured as an NZP CSI-RS resource). Then, the UE selects N (0 < N <= M) CMRs to report CJT CSI using the corresponding CMRs, and reports N and the selected N CMRs together. In this case, the UE can select one of the CMR combinations. Here, is the number of cases where i CMRs can be selected regardless of the order of the M CMRs.

[0172] In this case, the number of CPUs for CJT CSI is determined by one of the following methods.

[0173] 1) CPU number determination method

[0174] When calculating CJT using the given N CMRs, N channel measurements are performed, and one CJT CSI is calculated using the measured channels, so N CPUs are used for this. Since the number of combinations of selecting N CMRs from M CMRs is so for the given N, CPUs are used. Since the UE has to select N from the values between 1 and M, a total of CPUs are used.

[0175] The number of combinations of selecting N CMRs from M CMRs is so the number of CPUs may increase excessively. To solve this problem, the base station can limit the number of combinations of selecting N CMRs from M CMRs, or can limit only some combinations according to specific rules. For example, if N CMRs are selected in order from the first CMR, since there is one combination of selecting N CMRs from M CMRs, in the above formula,

[0176] 2) CPU number determination method

[0177] When calculating CJT using the given N CMRs, N channel measurements are performed, but the UE generates one channel by concatenating / aggregating the N measured channels, and calculates one RI / PMI / CQI for this one channel. When calculating RI / PMI / CQI separately for each of the N channels, N CPUs will be used as shown in CPU number determination method 1, but in the case of CPU number determination method 2, one RI / PMI / CQI is calculated for one aggregated channel, so when calculating CJT using the given N CMRs, one CPU is used.

[0178] Since the number of combinations that can select N CMRs from M CMRs is So for a given N use Since the UE must choose N from a value between 1 and M, a total of CPUs.

[0179] The number of combinations that can select N CMRs from M CMRs is Therefore, the CPU may be excessively increased. To solve this problem, the number of combinations that can select N CMRs from M CMRs may be limited by the base station, or only some combinations that can be selected may be limited by a specific rule. For example, when N CMRs are selected in sequence from the first CMR, Replaced by 1, because there is a combination that can select N CMRs from M CMRs.

[0180] 3) Method for determining the number of CPUs: 3-Number of CPUs = M+N

[0181] First, the UE selects N CMR combinations by measuring L1-RSRP (or L1-SINR) for each of the M CMRs. For example, if M=4 and the L1-RSRP of CMR 0 to CMR 3 are 10dB, 11dB, 12dB, 0dB, respectively, the UE selects CMR 0, CMR 1, and CMR 2 whose RSRP is not too low (e.g., above a certain threshold) or not too low than 12dB (maximum RSRP). M CPUs are used in this process.

[0182] Thereafter, CJT CSI is calculated for the selected N CMR combinations, using N CPUs in the process. However, since the base station does not know N before reporting the N selected by the UE, it is assumed that N = M or the maximum value among the available N (i.e., assuming the worst case with the highest complexity), and it is agreed that M or at most N CPUs are used.

[0183] If N is set to a specific value, this assumption is not required, so N CPUs are used. In this case, [M+N] CPUs are used instead of [M+M] CPUs.

[0184] 4) Method for determining the number of CPUs 4-Number of CPUs = M+1.

[0185] First, the UE selects N CMR combinations by measuring L1-RSRP ( / L1-SINR) for each of the M CMRs. For example, if the L1-RSRP is 10 dB, 11 dB, 12 dB, and 0 dB for M=4, CMR 0, CMR 1, CMR 2, and CMR 3, respectively, the UE selects CMR 0, CMR 1, and CMR 2 whose RSRP is not too low (e.g., above a certain threshold) or not too low below the maximum RSRP 12. M CPUs are used in this process.

[0186] Thereafter, CJT CSI is calculated for the selected N CMR combinations, and one CPU is used in the process. Specifically, the UE generates one channel by concatenating / aggregating N measured channels and calculates one RI / PMI / CQI for the one channel.

[0187] In the case where RI / PMI / CQI is calculated separately for each of N channels as in CPU number determination method 3, N CPUs will be used, but in the case of CPU number determination method 4, since one RI / PMI / CQI is calculated for one aggregated channel, one CPU is used.

[0188] 5) Method for determining the number of CPUs

[0189] First, the UE determines N, which means the number of TRPs participating in CJT. In this process, O CPUs are used (e.g., O=1 or O=M). Thereafter, for the determined N, there is CMR combinations, and each CMR combination uses N CPUs to calculate CJTCSI. Therefore, in this process, However, since the base station may not know N before reporting the N selected by the UE, the use of Can have the maximum value N to calculate

[0190] Alternatively, one CPU may be used to calculate the CJT CSI for each CMR combination, and in this case, the CJT CSI is calculated using CPUs instead of CPUs, so the total number of CPUs becomes However, since the base station does not know N before reporting the N selected by the UE, the use of Can have the maximum value N to calculate

[0191] 6) Method for determining the number of CPUs 6-Number of CPUs = O+N.

[0192] First, the UE selects N CMR combinations by measuring L1-RSRP (or L1-SINR) for each of the M CMRs. For example, if the L1-RSRP is 10 dB, 11 dB, 12 dB, 0 dB for M=4, CMR 0, CMR 1, CMR 2, and CMR 3, respectively, the UE selects CMR 0, CMR 1, and CMR 2 whose RSRP is not too low (e.g., above a certain threshold) or not too low than the maximum RSRP 12 dB. In this process, O (e.g., O=1 or O=M) CPUs are used, and this process is similar to the beam reporting process of reporting / calculating L1-RSRP / SINR when multiple CMRs are given, so O=1 can be assumed.

[0193] Thereafter, CJT CSI is calculated for the selected N CMR combinations, and N CPUs are used in the process. However, since the base station does not know N before reporting the N selected by the UE, it is agreed to use M or at most N CPUs under the assumption that N=M or the maximum value among the available N (i.e., assuming the worst case with the highest complexity).

[0194] If N is set to a specific value, this assumption is not required and N CPUs are used.

[0195] Alternatively, one CPU may be used to calculate the CJT CSI for the selected N CMR combinations. In this case, the number of CPUs is determined to be [0+1].

[0196] In CPU number determination methods 3 to 6, the number of CPUs uses A CPUs in the process of selecting N CMR combinations (or selecting N), and then uses B CPUs in the process of calculating CSI for given N CMR combinations (or given N). However, if these two processes are performed sequentially, the number of CPUs may also be determined as the maximum value among the CPUs required in each of the two processes without adding the number of CPUs to A + B. That is, the number of CPUs is determined by max(A, B), not A + B.

[0197] In the above description, when the UE selects N CMRs (N NZP CSI-RS or N TRPs) from M and calculates CJT CSI, various methods of how to count the number of CPUs have been proposed according to the implementation of the UE. Since the CPU number counting method may vary according to the UE implementation, it is preferred that the UE reports the CPU number counting method to the base station as a UE capability, and the base station and the UE count the number of CPUs in a common manner. In addition, for a given N, as M increases, the CJT CSI calculation complexity increases, so the number of CPUs can be reported per M value.

[0198] In addition, as the UE calculates CJT CSI by selecting N CMRs (N NZP CSI-RSs or N TRPs) from M, the CSI calculation complexity of the UE increases. Therefore, more CPUs can be allocated to perform processing. On the contrary, the processing can be performed by extending the Z and Z' values ​​(the minimum time required to calculate CSI) without increasing the number of allocated CPUs (for example, counting the number of CPUs to 1). In particular, Z means the time from the last symbol of the PDCCH that receives the DCI that triggers the CSI report to the first symbol for reporting CSI, and Z' means the time from the last symbol of the AP-CSI-RS for channel measurement for the nth CSI report to the first symbol for reporting the nth CSI.

[0199] For example, this complexity increases as M increases for a given N. Thus, as M increases, the Z and Z' values ​​may be set to be larger. Alternatively, when M is greater than or equal to a certain value, the Z and Z' values ​​may be set to be larger. For example, this may be increased by adding an α value to the existing Z and Z' values ​​or by multiplying them by n times.

[0200] Alternatively, if K CPUs are calculated to be used by the CPU number counting method, instead of actually using K CPUs, only one CPU may be used / allocated, and the Z and Z' values ​​may be multiplied by K to increase the CSI processing time.

[0201] In order to configure M CMRs, the base station may configure M NZP CSI-RSs to the UE, and the UE may generate a downlink channel assuming CJT by aggregating the channels estimated from the corresponding M CSI-RSs. For example, if M CSI-RSs each including k ports are configured, the UE may estimate the downlink channel of M TRPs by assuming M*k port CSI-RSs. If N of M are selected, the downlink channel corresponding to N TRPs may be estimated using N*k port CSI-RSs by aggregating only the corresponding N CSI-RSs.

[0202] In addition, as the M value increases (i.e., as the number of NZP CSI-RSs configured to calculate CMRs for CJT CSI increases), the number of CMR combinations selectable by the UE increases, and the amount of CSI calculation increases. Therefore, a method of determining the number of CPUs in different ways according to the M value is proposed.

[0203] If the M value is less than or equal to a specific value C (for example, C=2 or configured by the base station to the UE), the number of CMR combinations is small, so the CPU number determination method 1 or 2 using more CPUs is used among the methods proposed above. Otherwise, since there are many CMR combinations, the CPU number determination methods 3 to 5 using fewer CPUs are used. Therefore, the amount of CPUs used for CJT CSI calculation can be adjusted. This is just an example, and if there is a random CPU number determination method A using relatively more CPUs and a random CPU number determination method B using fewer CPUs, the CPU number determination method A is used in the case of a smaller M according to the M value. Otherwise, the CPU number determination method B can be used.

[0204] Alternatively, when the M value is less than or equal to a specific value C (C = 2 or configured by the base station to the UE), the number of CPUs is calculated by one of the CPU number determination methods 1 to 6 (or a random CPU number determination method). However, when the C value is exceeded, only CPUs totaling the number of CPUs are allocated (when M = C). That is, in order to prevent the CPU from increasing excessively as the M value increases, an upper bound is set based on the number of CPUs corresponding to M = C. If this method is used, the CPU is less than the actual number required for M>C, and it is preferred that the UE simply performs the CSI calculation, even if the accuracy is poor.

[0205] This method can also be applied to determine Z and Z' (the minimum time required to calculate CSI). That is, by setting the upper bounds of Z and Z' when M=C, it is preferred that Z and Z' are fixed to the set upper bounds even when M>C.

[0206] In addition, as the sum of the number of M NZP CSI-RS ports and the M value increase, the CSI processing complexity increases. For example, even if four NZP CSI-RSs are configured, if each has two CSI-RS ports, the UE needs to calculate an 8-port codebook based on the channel corresponding to a total of 8 ports. On the other hand, even if two NZP CSI-RSs are configured, if each has 32 CSI-RS ports, the UE needs to calculate a 64-port codebook based on the channel corresponding to a total of 64 ports. Therefore, a method of increasing the number of CPUs or increasing the Z and Z′ values ​​according to the sum of the number of ports of the M NZP CSI-RS is proposed. That is, if the sum of the number of ports increases, the number of CPUs or the Z and Z′ values ​​increase.

[0207] For example, when the sum of the number of ports of the M NZP CSI-RS is equal to or less than the constant C, only one CPU is used as in the past or the existing Z and Z' values ​​are applied. Otherwise, the number of CPUs is increased or the Z and Z' values ​​are increased. The constant C is set to 32, which is the maximum number of ports that can be configured for the NZP CSI-RS when the existing type II codebook is used. Alternatively, the constant C is indicated to the UE by the base station. Alternatively, the UE determines the constant C and reports it to the base station. More specifically, the increments of the CPU, Z, and Z' values ​​can be determined based on a range that includes the sum of the number of ports.

[0208] Specifically, if the sum of the number of ports of NZP CSI-RS exceeds the constant C and is less than or equal to 2C, the number of CPUs is further increased by 1 or the values ​​of Z and Z' are increased by α. If the sum of the number of ports of NZP CSI-RS exceeds the constant P*C and is less than or equal to (P+1)*C, the number of CPUs is further increased by P or the values ​​of Z and Z' are increased by P*α.

[0209] As another method of increasing the values ​​of Z and Z', it is possible to consider adding ((M-1)*C) to the existing Z and Z'. The constant C may be indicated by the base station to the UE or determined by the UE to be reported to the base station. In addition, the constant applied to Z and the constant applied to Z' may be different values, respectively.

[0210] The method of increasing the number of CPUs or the Z and Z' values ​​according to the sum of the number of ports of the M NZP CSI-RSs may be used in combination with other methods of the present disclosure. For example, when the sum of the number of ports of the M NZP CSI-RSs is equal to or less than C, the CPU, Z, and Z' values ​​are used (i.e., not increased), and the above various methods may be applied only when the sum of the number of ports of the M NZP CSI-RSs exceeds C. That is, the methods proposed above (e.g., CPU number determination method 1 to CPU number determination method 6) are used only when the sum of the number of ports of the M NZP CSI-RSs exceeds C.

[0211] In addition, when the CPU is insufficient for CJT CSI calculation or a processing time of Z or Z' is not given, the UE can perform CSI calculation and reporting by considering only a specific combination among the M NZP CSI-RS. For example, in this case, a specific NZP CSI-RS (e.g., the first NZP CSI-RS) among the M NZP CSI-RS is used to calculate the CSI. That is, the CSI transmitted for the TRP assumption S-TRP corresponding to the first NZP CSI-RS is fed back.

[0212] As another example, CSI is calculated using all M NZP CSI-RSs. That is, CSI for CJT transmission assuming M TRPs corresponding to the M NZP CSI-RSs is fed back. Even if the base station indicates a TRP selection function to the UE so that the UE can select N combinations, if the above-mentioned exceptional condition occurs, that is, if the CPU is insufficient or a total processing time of Z or Z′ is not given, the operation of calculating CSI using all M NZP CSI-RSs may be performed.

[0213] If the CSI processing time / CPU is insufficient, a method is proposed to calculate / report CJT CSI using only the first NZP CSI-RS to the Lth NZP CSI-RS among M NZP CSI-RS that can be calculated / reported within the remaining CSI processing time / CPU. For example, CJT CSI of M=4 should be reported, but if the CSI processing time / CPU is insufficient, only the CJT CSI of the first L NZP CSI-RS that can be reported with a given CSI processing time / CPU is reported.

[0214] In the above description, when CJT is calculated using given N CMRs, the following two methods are proposed.

[0215] First, N channel measurements are performed, and a CJT CSI is calculated using the measured channels. For this, N CPUs are used.

[0216] Second, one RI / PMI / CQI is calculated for one aggregated channel, thus using one CPU.

[0217] In addition to the above two methods, the UE may report through the UE capability how many CPUs will be used in the case of calculating the CJT using the given N CMRs. As the corresponding report value, one of the values ​​greater than or equal to 1 and less than or equal to N. Specifically, the UE may report X, so when counting the number of CPUs required to calculate the CJT using the given N CMRs in the above proposal, what is counted as N (e.g., CPU number determination method 1, CPU number determination method 3, CPU number determination method 5, and CPU number determination method 6) should be reported in a manner replaced with X, or what is counted as one (e.g., CPU number determination method 2, CPU number determination method 4, and CPU number determination method 6) should be reported in a manner replaced with X.

[0218] That is, in order to prevent the CPU from excessively increasing as the M value increases, an upper bound U is set for the number of CPUs. That is, when the number of CPUs determined by one of the above-mentioned CPU number determination methods is L, the final number of CPUs is determined to be min(L,U) (the smaller value of L and U). U may be reported by the UE to the base station as UE capability, or may be set by the base station. Alternatively, when the UE provides the number of CPUs provided to itself through the UE capability report, the UE may use this value as U. For example, according to the 3GPP TS 38.331 specification, since the following simultaneousCSI-ReportPerCC means the number of CPUs that the UE can use in a single component carrier (CC), this value may be set to U.

[0219] Similarly, to prevent Z and Z' from excessively increasing as the value of M increases, an upper bound U may be set for Z and Z'. That is, if Z and Z' are L symbols determined by the method proposed in the present disclosure, the final Z and Z' values ​​are determined to be min(L, U).

[0220] CPU occupancy time

[0221] According to the current 3GPP NR standard, the CPU is occupied until the first CSI report timing point of the SP-CSI report, and the AP (aperiodic)-CSI report occupies the CPU from the DCI reception timing point to the CSI report timing point. On the other hand, in the remaining CSI reports (i.e., the remaining CSI reports of the SP (semi-persistent)-CSI report and the P (periodic)-CSI report except its first CSI report), the CPU is occupied from the start symbol of the earliest CMR / IMR resource located in the CSI reference resource slot or the latest CMR / IMR opportunity in the corresponding previous slot to the CSI report timing point.

[0222] When M CMRs (i.e., M NZP CSI-RS resources for CMRs) are configured for CJT CSI calculation, the CPU occupancy time determination for the remaining CSI reports and P-CSI reports except the first CSI report of the SP-CSI report uses the existing method to determine the CPU occupancy start time for each NZP CSI-RS, and then the earliest value among the calculated M start times is determined as the CPU occupancy start time of the corresponding CJT CSI. This is to start using the CPU from the earliest occupancy start time among the occupancy start times calculated based on each of the M CSI-RSs, because unlike before, CSI is calculated using all M CSI-RSs.

[0223] Reporting mode for CJT CSI

[0224] According to the current 3GPP NR Release 17 standard, the UE can report NCJT CSI of up to two TRPs, for which there are reporting mode 0 and reporting mode 1. In reporting mode 0, the UE selects and reports the best CSI of the S-TRP CSI calculated with one CMR and the M-TRP CSI calculated with a CMR pair. For example, if CMR 1 to CMR 4 are configured for the S-TRP CSI and CMR (1, 2) and CMR (3, 4) are configured for the M-TRP CSI, the best CSI of the four S-TRP CSIs calculated with CMR 1 to CMR 4 and the two M-TRP CSIs calculated with CMR (1, 2) and CMR (3, 4) is selected / reported. On the other hand, in reporting mode 1, one M-TRP CSI is selected and reported, and 0 to two S-TRP CSIs are selected and reported. In addition, this CSI selection is reported through CRI.

[0225] If NCJT or CJT CSI of three or more (eg, N) TRPs may be reported in the future, this may be considered to configure a new reporting mode A and a new reporting mode B. N represents the number of CMRs configured for JT CSI calculation.

[0226] In the new reporting mode A, the UE selects / reports the best CSI among the JT CSI using i CMRs, but reports it for i=2,3…N. That is, the best CSI among the JT CSI of two CMRs is selected and reported, and the best CSI among the JT CSI of three CMRs is selected and reported. That is, the best selection from the JT CSI of N CMRs is reported. As a result, when 2 to N TRPs perform JT transmission, the best TRP combination and CSI are reported for each case. Instead of selecting / reporting one best CSI for each i, it can be configured to select / report L best CSIs.

[0227] Alternatively, in the new reporting mode B, the UE calculates JT CSI for i=2,3...N using i CMRs and selects / reports the best CSI among them. As a result, it is reported which one would be better to perform JT transmission for a specified number of TRPs. In addition, the best TRP combination and CSI at that time are reported.

[0228] The following Table 6 is an example of CSI of reporting mode A and reporting mode B.

[0229] In Table 6, when N=4, possible CMR combinations are configured for TRP numbers 2, 3, and 4.

[0230] Three CMR pairs are configured for two TRPs, namely, CMR (1,2), CMR (2,3) and CMR (3,4), three CMR groups are configured for three TRPs, namely, CMR (1,2,3) and CMR (2,3,4), and two CMR groups are configured for four TRPs, namely, CMR (1,2,3,4) and CMR (5,6,7,8).

[0231] In reporting mode A, the UE reports CSI by selecting CMR (1, 2) for 2TRP JT, by selecting CMR (2, 3, 4) for 3TRP JT, and by selecting CMR (5, 6, 7, 8) for 4TRP JT. On the other hand, in reporting mode B, the UE selects / reports the best CSI of CMR (2, 3, 4) among all M-TRP CSIs.

[0232] [Table 6]

[0233] Number of TRPs CMR configuration Reporting mode A Reporting mode B 2 (1,2),(2,3),(3,4) CSI of CMR(1,2) 3 (1,2,3),(2,3,4) CSI of CMR(2,3,4) CSI of CMR(2,3,4) 4 (1,2,3,4),(5,6,7,8) CSI of CMR(5,6,7,8)

[0234] In the above description, although it is assumed that i=2,3...N, CMR may not be configured for a specific value i. For example, the base station configures CMR (0,1) corresponding to i=2 and CMR (0,1,2,3) corresponding to i=4 to the UE, but may not configure the CMR combination corresponding to i=3. Alternatively, it may be configured so that the base station does not report for a specific i value (e.g., i=3). In this case, the calculation and reporting of i=3 are omitted in the above proposal.

[0235] In the new reporting mode, S-TRP CSI may be reported together with the M-TRP CSI report, and the base station configures how much S-TRP CSI will be reported in a similar manner to the existing method.

[0236] All CSIs assuming different numbers of TRPs are reported in reporting mode A. In addition, priorities between corresponding CSIs can be introduced. When uplink channel resources for reporting CSI are insufficient, CSI omission can be performed or the CSI encoding order can be determined (i.e., CSI payloads are cascaded in sequence based on priority) using this priority. For example, CSI with a smaller or larger number of M-TRPs (i.e., the number of CMRs) can be prioritized, CSI including a specific TRP (= CMR) can be prioritized, or the base station can set the priority.

[0237] In the present disclosure, it is assumed that the UE can freely select N as a value between 1 and M, but if the range of N is given as a range other than the range between 1 and M or is set to a specific value, i is adjusted and applied with the proposed formula according to the corresponding range.

[0238] Although it is assumed in the present disclosure that N CMRs among M CMRs can be freely selected for a given N, in this case, the amount of CSI calculation increases, and thus the number of CPUs increases. To solve this problem, when selecting N CMRs among M CMRs, it may be restricted so that a specific CMR should be included. For example, it may be restricted so that the first CMR should be included.

[0239] Although it is assumed in the above proposal that M CMRs are configured, the proposal can be applied even when one CMR consisting of M port groups is configured. For example, M=4 and 32-port CSI-RS are configured as one CMR, 8 ports form one port group, and a total of 4 port groups (e.g., port groups 0 to 3) are configured, and different QCL RS or TCI states can be configured for the port groups, respectively. In this case, one CMR is applied by being interpreted / replaced as one port group in the above proposal.

[0240] Even if it is not a CJT environment, the proposed method can be used from the perspective of network energy saving (NES). For example, in order to determine whether the UE can turn off some antenna ports while presenting 32 antenna ports to the UE, the base station can group them by 8 antenna ports and then report CSI according to the combination of antenna port groups. Even if some antenna ports are grouped to turn on / off some antenna ports for energy saving (without configuring different QCL types D source RS between antenna port groups as in the CJT scenario), one CMR is applied by being interpreted / replaced by one port group in the above proposal.

[0241] The parameters mentioned in the above disclosure, whether there is an application of the method proposed in the above disclosure, etc. can be indicated by the base station to the UE, reported by the UE to the base station, or set to fixed values.

[0242] In addition, when reporting CJT CSI, the UE does not expect the base station to configure the reporting of CRI together with the corresponding CSI. This is because when the operation of selecting CSI-RS as CRI and the operation of calculating CJT CSI of the selected CSI-RS are performed together, the CSI processing complexity of the UE is excessively increased. As a result, when the base station configures CJT CSI to be reported, the base station does not configure the reporting of CRI together with the corresponding CSI.

[0243] For ease of explanation, the present disclosure applies the proposed method under the assumption of collaborative transmission / reception between 2 TRPs, but can be extended to three or more multi-TRP environments, and can also be extended to multi-panel environments. The UE can identify different TRPs as different TCI states, and the UE uses TCI state #1 data / DCI / UCI reception / transmission to mean receiving / transmitting data / DCI / UCI from / to TRP 1.

[0244] In the present disclosure, a transmission opportunity (TO) refers to channels that are transmitted at different times when multiple channels are TDM, channels that are transmitted at different frequencies / RBs when FDM, and channels that are transmitted on different layers / beams / DM-RS ports when SDM. One TCI state is mapped to each TO. In the case of repeated transmission of the same channel, complete DCI / data / UCI is transmitted in one TO, and the receiving end receives multiple TOs to increase the reception success rate.

[0245] Figure 8 is a flowchart of an example in which a UE transmits CSI related to CJT (coherent joint transmission) based on M-TRP (multiple transmission and reception point) according to an embodiment of the present disclosure.

[0246] Reference Figure 8 In step A05, the UE receives information about a plurality of measurement resources corresponding to the M-TRP from the BS. The plurality of measurement resources include at least one of a channel measurement resource (CMR) and an interference measurement resource (IMR).

[0247] However, before step A05, the UE may transmit UE capability information related to M-TRP-based CJT to the BS. In this case, the UE capability information includes information on the number of CPUs that can be supported per the number of CMRs.

[0248] Next, in step A10, the UE calculates channel state information (CSI) related to the M-TRP-based CJT based on multiple measurement resources.

[0249] Here, the number of CSI processing units (CPUs) used to calculate CSI related to M-TRP based CJT may be determined based on the number of CMRs.

[0250] More specifically, the number of CPUs used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of CMR combinations consisting of at least one CMR and the number of CPUs corresponding to each CMR combination. The number of CPUs used to calculate the CSI related to the M-TRP-based CJT can be expressed as being determined as (where M is the number of CMRs).

[0251] In addition, the UE may receive a transmission request signal of CSI related to M-TRP-based CJT from the BS. In this case, a first minimum time interval between receiving the transmission request signal and sending the CSI related to M-TRP-based CJT and a second minimum time interval between receiving all measurement resources configured by the BS for reporting CSI related to M-TRP-based CJT and sending the CSI related to M-TRP-based CJT may be determined based on the number of measurement resources.

[0252] Finally, in step A15, the UE sends CSI related to the M-TRP-based CJT to the BS.

[0253] Figure 9 is a flowchart of an example in which a BS receives CSI related to M-TRP-based CJT according to an embodiment of the present disclosure.

[0254] Reference Figure 9 In step B05, the BS receives UE capability information related to M-TRP-based CJT from the UE. In particular, the UE capability information includes information about the number of CSI processing units (CPUs) that the UE can support for each number of channel measurement resources (CMRs).

[0255] Next, in step B10, the BS transmits information about a plurality of measurement resources corresponding to the M-TRP to the UE. The plurality of measurement resources may consist of at least one CMR and at least one interference measurement resource (IMR).

[0256] In addition, in step B15, the BS receives channel state information (CSI) related to M-TRP-based CJT calculated based on multiple measurement resources from the UE. Here, the number of CPUs of the UE used to calculate the CSI related to M-TRP-based CJT (i.e., the number of CPUs of the UE assumed by the BS) is determined based on the number of CMRs among the measurement resources. More specifically, the number of CPUs used to calculate the CSI related to M-TRP-based CJT is determined based on the number of CMR combinations consisting of at least one CMR and the number of CPUs corresponding to each CMR combination. The number of CPUs used to calculate the CSI related to M-TRP-based CJT can be expressed as determined as (where M is the number of CMRs).

[0257] Figure 10 An exemplary communication system to which the present embodiment is applied is shown.

[0258] Reference Figure 10, the communication system 1 applied to the present embodiment includes a wireless device, a base station (BS), and a network. Herein, the wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR) or long term evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include (but is not limited to) a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices, and may be implemented in the form of a head mounted device (HMD), a head up display (HUD) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital sign, a vehicle, a robot, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node relative to other wireless devices.

[0259] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS / network. For example, vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0260] Wireless communication / connection 150a, 150b or 150c may be established between wireless devices 100a to 100f / BS200 or BS200 / BS200. Herein, wireless communication / connection may be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device may send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b may send / receive signals through various physical channels. To this end, at least a portion of various configuration information for configuring processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes may be performed based on various proposals of the present embodiment.

[0261] Figure 11 An exemplary wireless device to which the present embodiment is applicable is shown.

[0262] Reference Figure 11 , the first wireless device 100 and the second wireless device 200 may transmit radio signals via various RATs (e.g., LTE and NR). Herein, {the first wireless device 100 and the second wireless device 200} may correspond to Figure 10 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0263] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then transmit a radio signal including the first information / signals through the transceiver 106. The processor 102 may receive a radio signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104. The memory 104 may be connected to the processor 102, and may store various information related to the operation of the processor 102. For example, the memory 104 may store software codes including commands for executing part or all of the processes controlled by the processor 102 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. Herein, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In this embodiment, the wireless device may represent a communication modem / circuit / chip.

[0264] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 206, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202, and may store various information related to the operation of the processor 202. For example, the memory 204 may store software codes including commands for executing part or all of the processes controlled by the processor 202 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. Herein, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In this embodiment, the wireless device may represent a communication modem / circuit / chip.

[0265] In the following, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by (but not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document.

[0266] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 to be driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flow charts disclosed in this document may be implemented in the form of codes, commands and / or command sets using firmware or software.

[0267] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 104 and 204 may be configured by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard disk drive, register, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 by various technologies such as wired or wireless connections.

[0268] One or more transceivers 106 and 206 may send user data, control information and / or radio signals / channels mentioned in the method and / or operation flow chart of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information and / or radio signals / channels mentioned in the description, function, process, proposal, method and / or operation flow chart disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information or radio signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods and / or operation flow charts disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals so as to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0269] Figure 12 2 shows other exemplary wireless devices to which this embodiment is applied. The wireless device may be configured to receive the wireless signal according to the usage / service (see Figure 10 ) are implemented in various forms.

[0270] Reference Figure 12 , the wireless devices 100 and 200 may correspond to Figure 11The wireless devices 100 and 200 of the present invention may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Figure 11 One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Figure 11 The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. The control unit 120 may transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 in the memory unit 130 through a wireless / wired interface.

[0271] The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional components 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in the form of, but not limited to, a robot ( Figure 10 100a), vehicles ( Figure 10 100b-1 and 100b-2), XR devices ( Figure 10 100c), handheld device ( Figure 10 100d), household appliances ( Figure 10 100e), IoT devices ( Figure 10 100f), digital broadcasting terminal, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 10 400), BS( Figure 10 200), network nodes, etc. The wireless device can be used in a mobile or fixed location according to the usage example / service.

[0272] exist Figure 12In the wireless devices 100 and 200, various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may all be connected to each other through a wired interface, or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. The various elements, components, units / parts and / or modules within the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a collection of one or more processors. As an example, the control unit 120 may be configured by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory unit 130 may be configured by a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM)), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0273] Figure 13 An exemplary vehicle or autonomous driving vehicle to which the present embodiment is applied is shown. The vehicle or autonomous driving vehicle may be implemented as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0274] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 104 and 204 may be configured by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard disk drive, register, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 by various technologies such as wired or wireless connections.

[0275] One or more transceivers 106 and 206 may send user data, control information and / or radio signals / channels mentioned in the method and / or operation flow chart of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information and / or radio signals / channels mentioned in the description, function, process, proposal, method and / or operation flow chart disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information or radio signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods and / or operation flow charts disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals so as to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0276] Figure 12 2 shows other exemplary wireless devices to which this embodiment is applied. The wireless device may be configured to receive the wireless signal according to the usage / service (see Figure 10 ) are implemented in various forms.

[0277] Reference Figure 12 , the wireless devices 100 and 200 may correspond to Figure 11The wireless devices 100 and 200 of the present invention may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Figure 11 One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Figure 11 The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. The control unit 120 may transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 in the memory unit 130 through a wireless / wired interface.

[0278] The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional components 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in the form of, but not limited to, a robot ( Figure 10 100a), vehicles ( Figure 10 100b-1 and 100b-2), XR devices ( Figure 10 100c), handheld device ( Figure 10 100d), household appliances ( Figure 10 100e), IoT devices ( Figure 10 100f), digital broadcasting terminal, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 10 400), BS( Figure 10 200), network nodes, etc. The wireless device can be used in a mobile or fixed location according to the usage example / service.

[0279] exist Figure 12In the wireless devices 100 and 200, various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may all be connected to each other through a wired interface, or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. The various elements, components, units / parts and / or modules within the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a collection of one or more processors. As an example, the control unit 120 may be configured by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory unit 130 may be configured by a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM)), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0280] Figure 13 An exemplary vehicle or autonomous driving vehicle to which the present embodiment is applied is shown. The vehicle or autonomous driving vehicle may be implemented as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0281] Reference Figure 13 , the vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Figure 12 Block 110 / 130 / 140.

[0282] The communication unit 110 may send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may enable the vehicle or autonomous vehicle 100 to travel on a road. The drive unit 140a may include an engine, a motor, a power system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous vehicle 100, and include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a depth sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously traveling along a determined path, a technology for traveling by automatically setting a path if a destination is set, and the like.

[0283] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the obtained data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed / direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically / periodically obtain the latest traffic information data from the external server and obtain surrounding traffic information data from neighboring vehicles. In the middle of autonomous driving, the sensor unit 140c may obtain vehicle status and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and driving plan based on the newly obtained data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving path, and / or driving plan to an external server. The external server may predict traffic information data based on information collected from the vehicle or autonomous driving vehicle using AI technology, etc., and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0284] Those skilled in the art will appreciate that, without departing from the spirit and basic characteristics of the present embodiment, the present embodiment may be implemented in other specific forms other than those described herein. Therefore, the above-mentioned embodiments should be interpreted as being illustrative in all respects, rather than restrictive. The scope of the present disclosure should be determined by the attached claims and their legal equivalents, rather than by the above description, and all changes falling within the meaning and equivalent scope of the attached claims are intended to be included therein. It is obvious to those skilled in the art that claims that are not explicitly referenced to each other in the attached claims may be presented as an embodiment combination, or included as a new claim by subsequent amendments after the application is submitted.

[0285] It will be apparent to those skilled in the art that the present disclosure may be specifically implemented in other specific forms without departing from the scope of the present disclosure. Therefore, the above detailed description should not be interpreted as being restrictive in all aspects, but should be regarded as illustrative. The scope of the present disclosure should be determined by the reasonable interpretation of the attached claims, and all changes within the equivalent scope of the present disclosure are intended to be included within the scope of the present disclosure.

[0286] Industrial Applicability

[0287] The present disclosure is applicable to UE, BS or other devices in a wireless mobile communication system.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising the following steps: receiving, from a base station BS, information about a plurality of measurement resources related to a multiple transmission and reception point M-TRP; Calculating channel state information CSI related to coherent joint transmission CJT based on M-TRP based on the plurality of measurement resources; and sending the CSI related to the M-TRP-based CJT to the BS, The number of CSI processing units CPU used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of channel measurement resources CMR among the measurement resources.

2. The method according to claim 1, wherein: The number of the CPUs used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of CMR combinations including at least one CMR and the number of the CPUs related to each of the CMR combinations.

3. The method according to claim 1, wherein: The number of the CPUs used to calculate the M-TRP-based CJT is determined as Where M is the number of CMRs.

4. The method according to claim 1, further comprising the steps of: receiving a transmission request signal of CSI related to the M-TRP-based CJT from the BS, Among them, the first minimum time interval between receiving the transmission request signal and sending the CSI related to the M-TRP-based CJT and the second minimum time interval between receiving all the measurement resources configured by the BS for reporting the CSI related to the M-TRP-based CJT and sending the CSI related to the M-TRP-based CJT are determined based on the number of CMRs.

5. The method according to claim 1, further comprising the steps of: Sending UE capability information related to the M-TRP-based CJT, The UE capability information includes information about the number of CPUs that can be supported by each number of CMRs.

6. The method according to claim 1, wherein: The plurality of measurement resources further include interference measurement resources IMR.

7. A user equipment UE in a wireless communication system, the UE comprising: at least one transceiver; at least one processor; as well as at least one computer memory operatively connectable to the at least one processor and storing instructions that, when executed, enable the at least one processor to perform operations comprising: receiving, from a base station BS, information about a plurality of measurement resources related to a multiple transmission and reception point M-TRP; Calculating channel state information CSI related to coherent joint transmission CJT based on M-TRP based on the plurality of measurement resources; and sending the CSI related to the M-TRP-based CJT to the BS, The number of CSI processing units CPU used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of channel measurement resources CMR among the measurement resources.

8. The UE according to claim 7, wherein: The number of the CPUs used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of CMR combinations including at least one CMR and the number of the CPUs related to each of the CMR combinations.

9. The UE according to claim 7, wherein: The number of the CPUs used to calculate the M-TRP-based CJT is determined as Where M is the number of CMRs.

10. The UE according to claim 7, wherein: The operation further includes: receiving a transmission request signal of CSI related to the M-TRP-based CJT, Among them, the first minimum time interval between receiving the transmission request signal and sending the CSI related to the M-TRP-based CJT and the second minimum time interval between receiving all the measurement resources configured by the BS for reporting the CSI related to the M-TRP-based CJT and sending the CSI related to the M-TRP-based CJT are determined based on the number of CMRs.

11. The UE according to claim 7, wherein: The operation further includes: sending UE capability information related to the M-TRP-based CJT, and wherein the UE capability information includes information on the number of CPUs that can be supported per the number of the CMRs.

12. The UE according to claim 7, wherein: The plurality of measurement resources further include interference measurement resources IMR.

13. A device for processing in a wireless communication system, the device comprising: at least one processor; as well as at least one computer memory operatively connectable to the at least one processor and storing instructions which, when executed, enable the at least one processor to perform operations for a user equipment (UE), the operations comprising: receiving, from a base station BS, information about a plurality of measurement resources related to a multiple transmission and reception point M-TRP; Calculating channel state information CSI related to coherent joint transmission CJT based on M-TRP based on the plurality of measurement resources; and sending the CSI related to the M-TRP-based CJT to the BS, The number of CSI processing units CPU used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of channel measurement resources CMR among the measurement resources.

14. A computer-readable storage medium storing at least one program code comprising instructions, which when executed enable at least one processor to perform operations for a user equipment (UE), the operations comprising: receiving, from a base station BS, information about a plurality of measurement resources related to a multiple transmission and reception point M-TRP; Calculating channel state information CSI related to coherent joint transmission CJT based on M-TRP based on the plurality of measurement resources; and sending the CSI related to the M-TRP-based CJT to the BS, The number of CSI processing units CPU used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of channel measurement resources CMR among the measurement resources.

15. A method performed by a base station BS in a wireless communication system, the method comprising the following steps: receiving, from a user equipment UE, UE capability information related to coherent joint transmission (CJT) based on multiple transmission and reception points (M-TRP); sending information about a plurality of measurement resources related to the M-TRP to the UE; as well as receiving, from the UE, channel state information CSI related to the M-TRP-based CJT calculated based on a plurality of the measurement resources, The UE capability information includes information about the number of CSI processing units CPU that can be supported by the UE for the number of per-channel measurement resources CMR among the measurement resources, and The number of the CPUs used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of the CMRs.

16. The method according to claim 15, wherein: The number of the CPUs used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of CMR combinations including at least one CMR and the number of the CPUs related to each of the CMR combinations.

17. The method according to claim 15, wherein: The number of the CPUs used to calculate the M-TRP-based CJT is determined as Where M is the number of CMRs.

18. A base station BS in a wireless communication system, the BS comprising: at least one transceiver; at least one processor; as well as at least one computer memory operatively connectable to the at least one processor and storing instructions that, when executed, enable the at least one processor to perform operations comprising: receiving, from a user equipment UE, UE capability information related to coherent joint transmission (CJT) based on multiple transmission and reception points (M-TRP); sending information about a plurality of measurement resources related to the M-TRP to the UE; and receiving, from the UE, channel state information CSI related to the M-TRP-based CJT calculated based on a plurality of the measurement resources, The UE capability information includes information about the number of CSI processing units CPU that can be supported by the UE for the number of per-channel measurement resources CMR among the measurement resources, and The number of the CPUs used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of the CMRs.

19. The BS according to claim 18, wherein: The number of the CPUs used to calculate the CSI related to the M-TRP-based CJT is determined based on the number of CMR combinations including at least one CMR and the number of the CPUs related to each of the CMR combinations.

20. The BS according to claim 18, wherein: The number of the CPUs used to calculate the M-TRP-based CJT is determined as Where M is the number of CMRs.

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