Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to an embodiment of the present disclosure has: a control unit that determines a plurality of frequency domain bases with respect to a plurality of transmission / reception points (TRPs) for coherent joint transmission (CJT), the plurality of frequency domain bases being shared by the plurality of TRPs or being unique to each TRP; and a transmission unit that transmits a report regarding channel state information (CSI) based on the plurality of frequency domain bases. The embodiment of the present disclosure makes it possible to determine an appropriate CSI / codebook for CJT.

Description

[Technical Field]

[0001] This disclosure relates to terminals and wireless communication methods in next-generation mobile communication systems. law, basis earth Stations and systems To relate to. [Background technology]

[0002] Long Term Evolution (LTE) was specified for Universal Mobile Telecommunications System (UMTS) networks with the aim of achieving even higher data rates and lower latency (Non-Patent Literature 1). Furthermore, LTE-Advanced (3GPP Rel.10-14) was specified for the aim of further increasing capacity and sophistication of LTE (Third Generation Partnership Project (3GPP®) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In future wireless communication systems (e.g., NR), reporting of channel status information (CSI) based on the reception of a reference signal is being considered. Furthermore, the use of multiple transmission / reception points (TRPs, Multi-TRP (MTRP)) or multiple panels (multiple panels, multi-panel) for DL ​​transmission to a user terminal (User Equipment (UE)) is being explored. Coherent joint transmission (CJT) using multiple TRPs / multiple panels is also being considered.

[0006] However, the CSI / codebook for CJT has not been adequately considered. Without clearly defined methods, there is a risk of deterioration in communication throughput and quality.

[0007] Therefore, this disclosure provides a terminal for determining an appropriate CSI / codebook for CJT, and a wireless communication method. law, basis earth Stations and systems One of the purposes is to provide it. [Means for solving the problem]

[0008] A terminal according to one aspect of this disclosure includes a control unit that determines a plurality of frequency domain bases common to a plurality of transmit / receive points (TRPs) for coherent joint transmission (CJT), or individual to each TRP, and a transmission unit that transmits a report of channel status information (CSI) based on the plurality of frequency domain bases. The plurality of second frequency domain bases for the second TRP among the plurality of TRPs include a plurality of first frequency domain bases for the first TRP among the plurality of TRPs. . [Effects of the Invention]

[0009] According to one aspect of this disclosure, an appropriate CSI / codebook for CJT can be determined. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 shows an example of a 16-level quantization table. [Figure 2] Figure 2 shows an example of an 8-level quantization table. [Figure 3] Figures 3A and 3B show an example of a Rel.16 Type 2-port selection codebook. [Figure 4] Figures 4A and 4B show an example of a Rel.17 Type 2 port selection codebook. [Figure 5] Figure 5 shows an example of FD base 1. [Figure 6] Figure 6 shows an example of FD base 2. [Figure 7] Figure 7 shows an example of FD base 1-2A. [Figure 8] Figure 8 shows an example of FD base 1-2B. [Figure 9] Figure 9 shows an example of window 2-1. [Figure 10] Figure 10 shows an example of window 2-2. [Figure 11] Figure 11 shows an example of FD base 2-2. [Figure 12] Figure 12 shows an example of FD base 2-3. [Figure 13] Figure 13 shows an example of FD base 2-4. [Figure 14] Figure 14 shows the first example of FD base 3. [Figure 15] Figure 15 shows a second example of FD base 3. [Figure 16] Figure 16 shows a third example of FD base 3. [Figure 17] Figure 17 shows a fourth example of FD base 3. [Figure 18] Figure 18 shows an example of bitmap 3. [Figure 19] Figure 19 shows another example of bitmap 3. [Figure 20] Figure 20 shows an example of SCI5. [Figure 21] Figure 21 shows an example of SCI6. [Figure 22] Figure 22 shows another example of SCI6. [Figure 23] Figures 23A and 23B show an example of constraint 2. [Figure 24] Figure 24 shows an example of report 2a-1. [Figure 25] Figure 25 shows an example from report 2a-2. [Figure 26] Figure 26 shows an example of report 2b. [Figure 27] Figure 27 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 28] Figure 28 shows an example of the configuration of a base station according to one embodiment. [Figure 29] Figure 29 shows an example of the configuration of a user terminal according to one embodiment. [Figure 30] Figure 30 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. [Figure 31] Figure 31 shows an example of a vehicle according to one embodiment. [Modes for carrying out the invention]

[0011] (Multi-TRP) In NR, it is being considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) will use one or more panels (multi-panels) to perform DL transmission to the UE. Furthermore, it is being considered that the UE will use one or more panels to perform UL transmission to one or more TRPs.

[0012] Multiple TRPs may correspond to the same cell identifier (Cell Identifier (ID)) or to different cell IDs. This cell ID may be a physical cell ID or a virtual cell ID.

[0013] Multiple TRPs (TRP#1, #2) may be connected by an ideal / non-ideal backhaul, and information, data, etc., may be exchanged. Each TRP in a multi-TRP may transmit a different code word (CW) and a different layer. Non-coherent joint transmission (NCJT) may be used as one form of multi-TRP transmission.

[0014] In NCJT, for example, TRP1 modulates and layers a first codeword and transmits a first PDSCH using a first precode with a first number of layers (e.g., 2 layers). TRP2 modulates and layers a second codeword and transmits a second PDSCH using a second precode with a second number of layers (e.g., 2 layers).

[0015] Furthermore, multiple PDSCHs (Multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. In other words, a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in at least one of the time and frequency resources.

[0016] These first and second PDSCHs may be assumed not to be quasi-co-located. Reception of multiple PDSCHs may be reinterpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0017] Multiple PDSCHs from a multi-TRP (which may also be called multiple PDSCHs) may be scheduled using a single DCI (single DCI (S-DCI), single PDCCH) (single master mode). A single DCI may be transmitted from one TRP of the multi-TRP. Multiple PDSCHs from a multi-TRP may each be scheduled using multiple DCIs (multi-DCI (M-DCI), multi-PDCCH (multiple PDCCH)) (multi-master mode). Multiple DCIs may each be transmitted from the multi-TRP. The UE may be assumed to send separate CSI reports for different TRPs, each for each TRP. Such CSI feedback may be called separate feedback, separate CSI feedback, etc. In this disclosure, “separate” may be interpreted as “independent.”

[0018] Furthermore, CSI feedback may be used, where CSI reports for both TRPs are sent to a single TRP. Such CSI feedback may also be called joint feedback or joint CSI feedback.

[0019] For example, in the case of separate feedback, the UE is configured to send a CSI report for TRP#1 to TRP#1 using one PUCCH (PUCCH1) and a CSI report for TRP#2 to TRP#2 using another PUCCH (PUCCH2). In the case of joint feedback, the UE sends a CSI report for TRP#1 and a CSI report for TRP#2 to either TRP#1 or #2.

[0020] Such multi-TRP scenarios allow for more flexible transmission control using high-quality channels.

[0021] (CSI report (CSI report or reporting)) In Rel.15 NR, a terminal (also called a user terminal, User Equipment (UE), etc.) generates (determines, calculates, estimates, measures, etc.) channel state information (CSI) based on a reference signal (RS) (or a resource for the RS), and transmits (reports, provides feedback, etc.) the generated CSI to the network (e.g., a base station). The CSI may be transmitted to the base station using, for example, an uplink control channel (e.g., a Physical Uplink Control Channel (PUCCH)) or an uplink shared channel (e.g., a Physical Uplink Shared Channel (PUSCH)).

[0022] The RS used to generate the CSI may be at least one of the following: a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), or a Demodulation Reference Signal (DMRS).

[0023] The CSI-RS may include at least one of Non Zero Power (NZP) CSI-RS and CSI-Interference Management (CSI-IM). The SS / PBCH block is a block that includes SS and PBCH (and the corresponding DMRS), and may be called an SS block (SSB), etc. The SS may also include at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).

[0024] Furthermore, CSI may include at least one of the following: Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), CSI-RS Resource Indicator (CRI), SS / PBCH Block Resource Indicator (SSBRI), Layer Indicator (LI), Rank Indicator (RI), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), and L1-SNR (Signal to Noise Ratio).

[0025] The UE may receive information regarding CSI reporting (report configuration information) and control CSI reporting based on said report configuration information. Such report configuration information may be, for example, the "CSI-ReportConfig" information element (IE) of Radio Resource Control (RRC). In this disclosure, RRC IE may be interpreted interchangeably with RRC parameters, higher layer parameters, etc.

[0026] The reporting configuration information (for example, "CSI-ReportConfig" in RRC IE) may include at least one of the following: • Information regarding the type of CSI report (report type information, e.g., "reportConfigType" in RRC IE) • Information regarding one or more CSI quantities (one or more CSI parameters) to be reported (report quantity information, e.g., "reportQuantity" in RRC IE) • Information regarding the RS resource used to generate the quantity (the CSI parameter) in question (resource information, for example, "CSI-ResourceConfigId" in RRC IE). • Information regarding the frequency domain covered by the CSI report (frequency domain information, for example, "reportFreqConfiguration" in RRC IE)

[0027] For example, the reporting type information may indicate a periodic CSI (P-CSI) report, an aperiodic CSI (A-CSI) report, or a semi-persistent CSI (SP-CSI) report.

[0028] Furthermore, the reported quantity information may specify at least one combination of the above CSI parameters (e.g., CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0029] Furthermore, resource information may also be the ID of a resource for RS. Such RS resources may include, for example, a non-zero-power CSI-RS resource or SSB and a CSI-IM resource (for example, a zero-power CSI-RS resource).

[0030] Furthermore, frequency domain information may indicate the frequency granularity of the CSI report. This frequency granularity may include, for example, wideband and subband. The wideband is the entire CSI reporting band. The wideband may be, for example, the entire carrier (component carrier (CC)), cell, serving cell, or the entire bandwidth part (BWP) within a carrier. The wideband may also be referred to as the CSI reporting band, the entire CSI reporting band, etc.

[0031] Furthermore, a subband may be part of the wideband and may consist of one or more resource blocks (RBs) or physical resource blocks (PRBs). The size of the subband may be determined according to the size of the BWP (number of PRBs).

[0032] Frequency domain information may indicate whether to report wideband or subband PMI (frequency domain information may include, for example, the RRC IE's "pmi-FormatIndicator" used to determine whether to report wideband or subband PMI). The UE may determine the frequency granularity of the CSI report (i.e., whether to report wideband or subband PMI) based on at least one of the above reported quantity information and frequency domain information.

[0033] If wideband PMI reporting is established (decided), one wideband PMI may be reported for the entire CSI reporting band. On the other hand, if subband PMI reporting is established, a single wideband indication i1 may be reported for the entire CSI reporting band, and one or more subband indications i2 (e.g., subband indications for each subband) may be reported for each subband within the entire CSI reporting band.

[0034] The UE performs channel estimation using the received RS and estimates the channel matrix H. The UE then feeds back the index (PMI) determined based on the estimated channel matrix.

[0035] PMI may represent a precoder matrix (also simply called a precoder) that the UE considers appropriate for use in downlink (DL) transmissions to the UE. Each value of PMI may correspond to a single precoder matrix. A set of PMI values ​​may correspond to a different set of precoder matrices called a precoder codebook (also simply called a codebook).

[0036] In a spatial domain, a CSI report may include one or more types of CSI. For example, the CSI may include at least one of a first type (Type 1 CSI) used for single-beam selection and a second type (Type 2 CSI) used for multi-beam selection. Single-beam can be rephrased as a single layer, and multi-beam can be rephrased as multiple beams. Furthermore, Type 1 CSI may not assume multi-user multiple input multiple output (MIMO), while Type 2 CSI may assume multi-user MIMO.

[0037] The above codebooks may include a codebook for Type 1 CSI (also called a Type 1 codebook, etc.) and a codebook for Type 2 CSI (also called a Type 2 codebook, etc.). Furthermore, Type 1 CSI may include Type 1 single-panel CSI and Type 1 multi-panel CSI, and different codebooks (Type 1 single-panel codebook and Type 1 multi-panel codebook) may be specified for each.

[0038] In this disclosure, Type 1 and Type I may be interpreted as interchangeable. In this disclosure, Type 2 and Type II may be interpreted as interchangeable.

[0039] The Uphill Control Information (UCI) type may include at least one of the following: Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), scheduling request (SR), or CSI. The UCI may be carried by PUCCH or by PUSCH.

[0040] In Rel.15 NR, the UCI may include one CSI part for wideband PMI feedback. CSI report #n will include PMI wideband information if reported.

[0041] In Rel.15 NR, the UCI may include two CSI parts for subband PMI feedback. CSI part 1 contains wideband PMI information. CSI part 2 contains one wideband PMI piece and several subband PMI pieces. CSI parts 1 and 2 are encoded separately.

[0042] In Rel.15 NR, the UE is configured by a higher layer with N (N≧1) CSI reporting settings and M (M≧1) CSI resource settings. For example, a CSI reporting setting (CSI-ReportConfig) includes resource settings for channel measurement (resourcesForChannelMeasurement), CSI-IM resource settings for interference (csi-IM-ResourceForInterference), NZP-CSI-RS settings for interference (nzp-CSI-RS-ResourceForInterference), and report quantity (reportQuantity). Each of the resource settings for channel measurement, CSI-IM resource settings for interference, and NZP-CSI-RS settings for interference is associated with a CSI resource setting (CSI-ResourceConfig, CSI-ResourceConfigId). The CSI resource configuration includes a list of CSI-RS resource sets (csi-RS-ResourceSetList, e.g., NZP-CSI-RS resource set or CSI-IM resource set).

[0043] To enable more dynamic channel / interference hypotheses for NCJT, targeting both FR1 and FR2, evaluation and specification of CSI reporting for at least one multi-TRP and multi-panel transmission of DL are being considered.

[0044] (Codebook settings) The UE (Unified Environment) configures its codebook parameters (CodebookConfig) via higher-layer signaling (RRC signaling). The codebook configuration is included in the higher-layer (RRC) parameter CSI-ReportConfig.

[0045] In the codebook configuration, at least one codebook is selected from Type 1 Single Panel (typeI-SinglePanel), Type 1 Multi Panel (typeI-MultiPanel), Type 2 (typeII), and Type 2 Port Selection (typeII-PortSelection).

[0046] The codebook parameters include parameters related to the codebook subset restriction (CBSR) (…Restriction). The CBSR setting is a bit that indicates which PMI reports are allowed ("1") and which are not allowed ("0") for the precoder associated with the CBSR bit. Each bit in the CBSR bitmap corresponds to one codebook index / antenna port.

[0047] (CSI reporting settings) The CSI reporting configuration (CSI-ReportConfig) in Rel.16 includes, in addition to the codebook configuration (CodebookConfig), CSI-RS resources for channel measurement (resourcesForChannelMeasurement (CMR)), CSI-RS resources for interference measurement (csi-IM-ResourcesForInterference (ZP-IMR), nzp-CSI-RS-ResourcesForInterference (NZP-IMR)), etc. Of the parameters of CSI-ReportConfig, all parameters except codebookConfig-r16 are also included in the CSI reporting configuration in Rel.15.

[0048] In Rel.17, an extended CSI reporting configuration (CSI-ReportConfig) for CSI measurement / reporting of multi-TRPs using NCJT is being considered. In this CSI reporting configuration, two CMR groups are set up, corresponding to each of the two TRPs. The CMRs within each CMR group may be used for at least one measurement of multi-TRPs and single TRPs using NCJT. The N CMR pairs of NCJT are set up by RRC signaling. The UE may be configured by RRC signaling to determine whether to use the CMRs of the CMR pairs for single TRP measurements.

[0049] For CSI reporting related to multi-TRP / panel NCJT measurements configured by a single CSI reporting setting, support for at least one of the following options 1 and 2 is being considered.

[0050] <Option 1> The UE is set to report X CSIs (X=0, 1, 2) associated with a single TRP measurement hypothesis / assumption and one CSI associated with the NCJT measurement. If X=2, the two CSIs are associated with two different single TRP measurements using CMRs from different CMR groups.

[0051] <Option 2> The UE may be configured to report one CSI that corresponds to the best measurement result among the measurement hypotheses for NCJT and single TRP.

[0052] As mentioned above, in Rel.15 / 16, CBSR is set for each codebook setting for each CSI reporting configuration. In other words, CBSR applies to all CMRs, etc., within the corresponding CSI reporting configuration.

[0053] However, when applying options 1 and 2 above to the CSI reporting settings for Rel.17 multi-TRP, the following measurement settings may be made. Option 1 (X=0): Measurement of NCJT CSI only. Option 1 (X = 1): Measurement of CSI of NCJT and CSI of a single TRP (one TRP). Option 1 (X = 2): Measurement of CSI of NCJT and CSI of a single TRP (two TRPs). Option 2: Measurement of both CSI of NCJT and CSI of a single TRP.

[0054] (Type 1 codebook) For the base station panel, a type 1 single panel codebook and a type 1 multi-panel codebook are defined. In the type 1 single panel, for the CSI-RS antenna port number P CSI-RS and (N1, N2), an antenna model of the CSI antenna port array (logical setting) is defined. In the type 1 multi-panel, for the CSI-RS antenna port number P CSI-RS and (N g , N1, N2), an antenna model of the CSI antenna port array (logical setting) is defined.

[0055] For Rel.15 type 1 single panel CSI, the UE sets the upper layer parameter of the codebook type (subType within type1 within codebookType within CodebookConfig) to the type 1 single panel ('typeI-SinglePanel'). If the number of layers v ∉ {2, 3, 4}, the PMI value corresponds to three codebook indices i 1,1 , i 1,2 , i2. If the number of layers v ∈ {2, 3, 4}, the PMI value corresponds to four codebook indices i 1,1 , i 1,2 , i 1,3 , i2. If the number of layers v ∉ {2, 3, 4}, the composite codebook index i1 = [i 1,1 , i 1,2 . If the number of layers v ∈ {2, 3, 4}, the composite codebook index i1 = [i 1,1 , i 1,2 , i 1,3 .

[0056] Number of CSI antenna ports P CSI-RS The supported settings (combinations of values) for (N1,N2) and (O1,O2) are specified in the specification. (N1,N2) indicates the number of antenna elements in two dimensions and is set by n1-n2 in moreThanTwo within nrOfAntennaPorts in typeI-SinglePanel. (O1,O2) is the two-dimensional oversampling factor. i corresponds to the horizontal beam. 1,1 The values ​​are {0,1,...,N1O1-1}. i corresponds to the vertical beam. 1,2 i2 is {0,1,...,N2O2-1}. i2 is {0,1,2,3}. For codebookMode=1, antenna port 3000 to 2999+P CSI-RS The matrix for a one-layer CSI reporting codebook using W_i 1,1 ,i 1,2 ,i2^(1). Here, W l,m,n (1) It is given by the following equation. TIFF0007848322000001.tif17167

[0057] Compared to a Type 1 single panel, Rel.15 Type 1 multi-panel CSI has N1, N2, and the number of panels N g This is set. Inter-panel co-phasing (phase compensation between panels) is set as i, 1,4 The following is added and reported for each panel: the same SD beam (precoding matrix W l ) is selected, and only inter-panel phase matching is added and reported.

[0058] Number of CSI antenna ports P CSI-RS For the supported (N gThe settings (combinations of values) for (N1,N2) and (O1,O2) are defined in the specification. (N1,N2) are set by ng-n1-n2 within typeI-MultiPanel. 1,1 The formula is {0,1,...,N1O1-1}. 1,2 The formula is {0,1,...,N2O2-1}. q=1,...,N g -1 for i 1,4,q i2 is {0,1,2,3}. i2 is {0,1,2,3}. For codebookMode=1, antenna port 3000 to 2999+P CSI-RS The matrix for a one-layer CSI reporting codebook using W_i 1,1 ,i 1,2 ,i 1,4 ,i2^(1). Here, W l,m,p,n (1) =W l,m,p,n ^1,N g ,1.

[0059] N g W_l,m,p,n^1,N for {2,4} g ,1 and W_l,m,p,n^2,N g ,1 (1st layer, N g Matrix W for =2, codeBookMode=1 l,m,p,n 1,2,1 And the second layer, N g Matrix W for =2, codeBookMode=1 l,m,p,n 2,2,1 And the first layer, N g Matrix W for =4, codeBookMode=1 l,m,p,n 1,4,1 And the second layer, N g Matrix W for =4, codeBookMode=1 l,m,p,n 2,4,1 (and) are given by the following equation. TIFF0007848322000002.tif114167

[0060] Here, φ n =e jπn / 2 Ng For =2, p=p1, N g For =4, p=[p1,p2,p3]. φ_p1, φ_p2, and φ_p3 represent inter-panel co-phasing. The same beam (SD beam matrix, precoding matrix W) is used for panels 0, 1, 2, and 3. l ) is selected, where φ_p1 represents the phase compensation of panel 1 relative to panel 0, φ_p2 represents the phase compensation of panel 2 relative to panel 0, and φ_p3 represents the phase compensation of panel 3 relative to panel 0.

[0061] (Type 2 Codebook) Assuming an ideal backhaul, synchronization, and the same number of antenna ports across multiple TRPs, CSI acquisition for coherent joint transmission (CJT) for FR1 and up to four TRPs is being considered. Improvements to the Rel.16 / 17 Type 2 codebook are being considered for CJT multi-TRP for FDDs.

[0062] In this disclosure, a matrix Z with X rows and Y columns may be denoted as Z(X×Y).

[0063] For type 2 CSI in Rel.15, the generation of subband-wise precoding vectors for a given layer k is based on the following equation: W k (N t ×N3) = W1W 2,k (Y1)

[0064] N t is the number of ports. N3 is the total number of precoding matrices (precoders) (number of subbands) shown by PMI. W1(N t×2L) is a matrix (SD beam matrix) consisting of L ∈ {2,4} (oversampled) spatial domain (SD) 2D DFT vectors (SD beams, 2D-DFT vectors). L is the number of beams. For example, L = 2 SD 2D-DFT vectors are each b i ,b j That is. W 2,k (2L×N3) is the matrix of the subband complex linear combination (LC) coefficients (combination coefficients) for layer k. 2,k This represents beam selection and phase matching (co-phasing) between two polarizations. For example, two W 2,k Each is c i ,c j For example, the channel matrix h is a linear combination of L = 2 SD 2D-DFT vectors c i b i ,+c j b j It is approximated by the LC coefficient matrix W. The feedback overhead is mainly due to the LC coefficient matrix W. 2,k This is due to the following. Furthermore, Rel.15 Type 2 CSI only supports ranks 1 and 2.

[0065] Rel.16 Type 2 CSI uses frequency domain (FD) compression, W 2,k Reduces the overhead associated with it. Rel.16 Type 2 CSI supports ranks 3 and 4 in addition to ranks 1 and 2.

[0066] In Rel.16, Type 2 CSI may report information based on the following equation for a given layer k, as reported by the UE. W k = W1W ~ k W f,k H (Y2)

[0067] W 2,k is, W ~k W f,k H is approximated by. The matrix W ~ may be represented by attaching ~(tilde w) above W. The matrix W f,k H is f,k the adjoint matrix of W.

[0068] For the CSI report, the UE may be set to one of two subband sizes. The subband (CQI subband) is defined as N PRB SB consecutive PRBs and may depend on the total number of PRBs in the BWP. The number of PMI subbands R per CQI subband is set by the RRC IE (numberOfPMI-SubbandsPerCQI-Subband). R controls the total number N3 of precoding matrices represented by PMI as a function of the number of subbands set within the csi-ReportingBand, the subband size set by subbandSize, and the total number of PRBs in the BWP.

[0069] W1(N t ×2L) is a matrix consisting of multiple (oversampled) spatial domain (SD) 2D-DFT (vectors, beams). For this matrix, multiple indices of the two-dimensional discrete Fourier transform (2D-DFT) vectors and the two-dimensional oversampling factor are reported. The response / distribution of the spatial domain represented by the SD 2D-DFT vectors may be called the SD beam.

[0070] W ~ k (2L×M v([[]]) is a matrix consisting of combination coefficients (sub-band complex linear combination (LC) coefficients). For this matrix, a maximum of K0 non-zero coefficients (NZCs) are reported. The report consists of two parts: a bitmap capturing the NZC positions and the quantized NZCs.

[0071] W f,k (N3×M v ([[]]) is a matrix consisting of multiple frequency domain (FD) bases (vectors) for layer k. There are M v FD bases (FD DFT bases) for each layer. When N3 > 19, M v DFTs from an intermediate subset (InS) of size N3' (< N3) are selected. When N3 ≤ 19, log2(C(N3 - 1, M v - 1)) bits are reported. Here, C(N3 - 1, M v - 1) is the number of combinations of choosing M v - 1 from N3 - 1, also called binomial coefficients. The frequency domain response / distribution (frequency response) represented by the linear combination of FD basis vectors and combination coefficients may be called an FD beam. The FD beam may correspond to a delay profile (time response).

[0072] A subset of FD bases is given as {f1,..., f Mv}. Here, f i is the i-th FD basis for the k-th layer, and i ∈ {1,..., M v [[ID=X]]}. The PMI sub-band size is given by CQI sub-band size / R, where R ∈ {1, 2}. The number M v [[]] of FD bases for a given rank v is given by ceil(p v [[]] × N3 / R). The number of FD bases is the same for all layers k ∈ {1, 2, 3, 4}. p v [[]] is set by the upper layer.​​​

[0073] Matrix W 2,k Each row represents the channel frequency response of a particular SD beam. When an SD beam has high directivity, the channel taps per beam are limited (the power delay profile is sparse in the time domain). As a result, the channel frequency responses of each SD beam are highly correlated (approaching flatness in the frequency domain). In this case, the channel frequency response can be approximated by a linear combination of a small number of FD basis vectors. For example, M v If = 2, then FD basis f2, f q and linear coupling coefficient d1 0 d2 0 Using this, the frequency response associated with the SD beam b0 is d1 0 f2+,d2 0 f q It is approximated by this.

[0074] Maximum gain M v A number of FD basis sets are selected. v By making it N3, W ~ k The overhead is W 2,k It's considerably smaller than the overhead of M. v All or part of the FD basis sets are used to approximate the frequency response of each SD beam. A bitmap is used to report only the FD basis sets selected for each SD beam. If no bitmap is reported, all FD basis sets are selected for each SD beam. In this case, the nonzero coefficients (NZCs) of all FD basis sets are reported for each SD beam. The maximum number of NZCs in a single layer is K. k NZ ≤K0=ceil(β×2LM) v ) and the maximum number of NZCs across all layers is K NZ ≤2K0 = ceil(β × 2LM) v ) β is set by the higher layer.

[0075] W ~ kEach complex coefficient reported within is the amplitude and phase, quantized separately. [Amplitude quantization] The polarization eigenreference amplitude is shown in the table in Figure 1 (amplitude coefficient indicator i 2,3,l Mapping of multiple elements: element k l,p (1) from the amplitude coefficient p l,p (1) This is a 16-level quantization using mapping to . All other coefficients are shown in the table in Figure 2 (amplitude coefficient indicator i). 2,4,l Mapping of multiple elements: element k l,i,f (2) from the amplitude coefficient p l,i,f (2) This is an 8-level quantization using mapping to . [Phase Quantization] All coefficients are quantized using 16-PSK. For example, φ l,i = exp(j2πc l,i / 16), c l,i ∈{0,...,15}. Here, c l,i This is the associated phase value φ l,i This is the phase coefficient reported by the UE (using 4 bits).

[0076] The Rel.16 push-type 2 CSI feedback consists of two parts. CSI Part 1 has a fixed payload size and is used to identify the number of information bits in CSI Part 2. The size of Part 2 is variable (the UCI size depends on the number of non-zero amplitude coefficients (NZCs), the number of which is unknown to the base station). The UE reports the number of NZCs in CSI Part 1, and this number determines the size of CSI Part 2. After receiving CSI Part 1, the base station recognizes the size of CSI Part 2.

[0077] In enhanced type 2 CSI feedback, CSI part 1 includes the RI, the CQI, and an indication of the total number of non-zero amplitudes across multiple layers for the enhanced type 2 CSI. The fields of part 1 are encoded separately. CSI part 2 includes the PMI of the enhanced type 2 CSI. Parts 1 and 2 are encoded separately. CSI part 2 (PMI) includes the oversampling factor, the index of the 2D-DFT basis, and the index M of the initial DFT basis (start offset) of the selected DFT window. initial This includes at least one of the following: a DFT basis selected for each layer, non-zero LC coefficients (NZC, amplitude and phase) for each layer, the strongest coefficient indicator (SCI) for each layer, and the amplitude of the strongest coefficient for each layer / polarization.

[0078] Multiple PMI indices (PMI values, codebook indices) associated with different CSI Part 2 information may, for the k-th layer, follow the following: ·i 1,1 : Oversampling factor ·i 1,2 : Multiple indexes based on 2D-DFT ·i 1,5 : Index of the initial DFT basis (start offset) of the selected DFT window M initial ·i 1,6,k : DFT basis selected for the k-th layer ·i 1,7,k : Bitmap for the k-th layer ·i 1,8,k : The strongest coefficient indicator (SCI) for the k-th layer. ·i 2,3,k : Amplitude of the strongest coefficient (for both polarizations) of the k-th layer ·i 2,4,k : Amplitude of the reported coefficient of the k-th layer ·i 2,5,k : Phase of the reported coefficients of the k-th layer

[0079] i 1,5 and i 1,6,k This is the PMI index for DFT base reporting. Only when N3 > 19, i 1,5 It is reported.

[0080] As part of the CSI Part 2 grouping, PMI information for a given CSI report is grouped into three groups (groups 0 and 2). This is important when CSI omissions occur. Index i 2,4,l i 2,5,l i 1,7,l Each reported element is associated with a specific priority rule. Groups 0 and 2 follow the following: Group 0: Index i 1,1 i 1,2 i 1,8,l (l=1,...,v) Group 1: Index i (if reported) 1,5 , index i (if reported) 1,6,l i 1,7,l The highest (top) v2LM among them v -floor(K NZ / 2) priority elements, i 2,3,l i 2,4,l The highest (top) ceil (K NZ / 2)-v priority elements, i 2,5,l The highest (top) ceil (K NZ ( / 2) - v priority elements (l=1,...,v) Group 2:i 1,7,l The lowest (lowest) floor (K NZ / 2) priority elements, i 2,4,l The lowest (lowest) floor (K NZ / 2) priority elements, i 2,5,l The lowest (lowest) floor (K NZ (l=1,...,v) priority elements (l=1,...,v)

[0081] In Type 1 CSI, the SD beam represented by the SD DFT vector is sent towards the UE. In Type 2 CSI, L SD beams are linearly combined and sent towards the UE. Each SD beam can be associated with a plurality of FD beams. For the corresponding SD beam, the channel frequency response can be obtained by the linear combination of their FD basis vectors. The channel frequency response corresponds to the power delay profile.

[0082] (Type 2 Port Selection Codebook) In the Rel.16 Type 2 port selection (PS) CSI, the Type 2 PS codebook (CB) does not require the UE to derive the SD beam considering the 2D-DFT within the normal Type 2 CB. Instead, the base station transmits CSI-RS using K beamformed CSI-RS ports considering a set of SD beams. The UE identifies the best L (≤ K) CSI-RS ports and reports their indices within W1.

[0083] For layer k ∈ {1, 2, 3, 4}, the per-subband (subband (SB)-wise) precoder generation is given by the following equation. W k (N t × N3) = QW1W ~ k W f,k H (Y3)

[0084] Here, Q(N t × K) represents the K SD beams used for CSI-RS beamforming. W1(K × 2L) is a block diagonal matrix. W ~ k (2L × M) is the LC coefficient matrix. W f,k (N3 × M) consists of N3 DFT basis vectors (FD basis vectors). K is set by the upper layer. L is set by the upper layer. P CSI-RS ∈ {4, 8, 12, 16, 24, 32}. PCSI-RS When greater than 4, L ∈ {2, 3, 4}.

[0085] In the CSI / codebook of Rel.15 / 16 type 2 port selection, each CSI-RS port #i is associated with an SD beam (b i )(as shown in FIGS. 3A and 3B).

[0086] (Rel.17 type 2 port selection codebook) In the Rel.17 type 2 port selection CSI / codebook (extended type 2 port selection codebook), each CSI-RS port #i is associated with an SD-FD beam pair (SD beam b i and FD beam f i,j (where j is the frequency index)) (as shown in FIGS. 4A and 4B). In this example, ports 3 and 4 are associated with the same SD beam and different FD beams.

[0087] The frequency selectivity of the channel frequency response observed at the UE based on the SD beam - FD beam pair can be reduced by delay pre - compensation compared to the frequency selectivity of the channel frequency response observed at the UE based on the SD beam.

[0088] The main scenario of the Rel.17 type 2 port selection codebook is FDD. Although the channel reciprocity based on SRS measurement is not perfect, the base station can obtain some partial information. By using SRS measurement at the base station in addition to CSI reporting, the base station can obtain CSI for the determination of the DL MIMO precoder. In this case, some CSI reports may be omitted for the reduction of CSI overhead.

[0089] In Rel.17 Type 2PS CSI, each CSI-RS port is beamformed using the SD beam and FD basis vector. Each port is associated with an SD-FD pair.

[0090] For a given layer k, the UE may report information based on the following equation. W k (K × N³) = W¹W ~ k W f,k H (Y4)

[0091] For W1 (K×2L), each matrix block consists of L columns of a K×K identity matrix. The base station transmits K beamformed CSI-RS ports. Each port is associated with an SD-FD pair. The UE selects L ports out of the K and assigns them to PMI(W 1,k It reports to the base station as part of the ) configuration. In Rel.16, each port is associated with an SD beam.

[0092] W ~ k (2L x M) v The matrix consists of coupling coefficients (subband complex LC coefficients). A maximum of K0 NZCs are reported. The report consists of two parts: a bitmap capturing the NZC positions and the quantized NZCs. In certain cases, the bitmap can be omitted. In Rel. 16, the bitmap of NZC positions is always reported.

[0093] W f,k (N3×M v ) is a matrix consisting of N3 FD basis (FD DFT basis) vectors. M for each layer. v There are several FD bases. The base station is W f,k You can delete it. W f,k If it is on, M v An additional FD basis is reported. f,k If it is off, no additional FD bases are reported. In Rel.16, Wf,k This is always reported.

[0094] (CJT) Joint transmission (JT) may mean simultaneous data transmission from multiple points (e.g., TRPs) to a single UE.

[0095] Rel.17 supports NCJT from two TRPs. PDSCHs from the two TRPs may be precoded and decoded independently. Frequency resources may be non-overlapping, partially overlapping, or fully overlapping. If overlap occurs, a PDSCH from one TRP will interfere with a PDSCH from the other TRP.

[0096] Rel.18 considers supporting CJT using up to four TRPs. Data from the four TRPs may be coherently precoded and transmitted to the UE over the same time-frequency resources. For example, the same precoding matrix may be used to consider channels from four TRPs. Coherence may mean that there is a constant relationship between the phases of multiple received signals. Using 4TRP joint precoding may improve signal quality and eliminate interference between the four TRPs. The data may only be subject to interference outside the four TRPs.

[0097] In the ideal case (where the four TRPs are collated (considered to be in the same position)), joint estimation of the aggregated channel matrix H can be performed, and the joint precoding matrix V can be fed back. However, the large-scale path losses of the four paths can differ significantly. The joint precoding matrix V based on a constant module codebook is not accurate. In this case, the feedback per TRP and the inter-TRP coefficients can be aligned with the current NR type 2 codebook.

[0098] For CJT of up to four TRPs in FR1, the selection of the four TRPs may be semi-static. Therefore, the selection and the setting of the four CMRs (four CSI-RS resources) for channel measurement may also be semi-static. Dynamic instruction of the four TRPs from the list of CSI-RS resources is also possible, but unlikely.

[0099] The path loss from the four TRPs to the UE is different. Therefore, it is insufficient to report only one aggregated CSI representing the joint channel matrix.

[0100] Considering the fallback behavior to NCJT (i.e., single TRP), a CSI per TRP (i.e., a single TRP CSI like the NCJT CSI in Rel. 17) is also conceivable.

[0101] (Rel.17 NCJT CSI) For Rel.17 NCJT CSI, two CMR groups with Ks=K1+K2 CMRs are configured in the UE. K1 and K2 are the number of CMRs in the two CMR groups, respectively. N CMR pairs are configured by the upper layer through selection from all possible pairs. N=1, Ks=2 is supported. max Support for =2 is an optional feature of UE.S,max Support for =X is an optional feature of the UE.

[0102] At least one of the following Options 1 and 2 is supported. [Option 1] The UE may be configured to report X CSIs associated with a single TRP measurement hypothesis and one CSI associated with an NCJT measurement hypothesis. X = 0, 1, 2. When X = 2, the two CSIs are associated with two different single TRP measurement hypotheses with multiple CMRs from different CMR groups. Support for X = 1, 2 is an optional feature of the UE for UEs that support Option 1. [Option 2] The UE may be configured to report one CSI associated with the best one of the NCJT and single TRP measurement hypotheses.

[0103] The following are being considered as CSI extensions for CJT. · CMR and IMR for measurement of up to four TRPs. · Per-TRP CSI with inter-TRP CSI feedback for x-TRP CJT. · New feedback and codebook for inter-TRP CSI: inter-TRP phase matrix / inter-TRP amplitude matrix / (matrix including both amplitude and phase) inter-TRP matrix. · Additional reportable x-TRP CJT CQI.

[0104] The following are being considered as multi-TRP CJT CSI. · Setting restrictions for CMR / CSI for each TRP. · Inter-TRP CSI / PMI (e.g., inter-TRP phase with / without inter-TRP amplitude). [Option 1] In addition to the Rel.16 / 17 type 2 codebook, an independent codebook and feedback. [Option 2] W k~ W f,k H The W2 of CSI / PMI between TRPs transmitted with / within. Common / different FD basis for multiple TRPs.

[0105] The following are being considered for a multi-panel type 2CSI for multi-TRP CJT: • Expansion of Rel.16 / 17 Type 2 codebooks and Type 2 PS codebooks to multi-panel configurations. • New antenna configuration for Type 2 multi-panel codebooks.

[0106] (CJT CSI) W1 (SD basis) / W for each TRP f The (FD basis) may be the same or different. W for each TRP k (NZC) may be different. W1 / W for each TRP f / W k These may be selected jointly or individually. W1 / W f / W k For the design, it is preferable to have different scenarios with different options. φ This may be reported as individual content, W k These may be reported internally. The policies used relate to deployment scenarios (e.g., intra-site multi-TRP or inter-site multi-TRP).

[0107] For example, the precoding matrix for 4-TRP CJT CSI (codebook) is W1 / W for each TRP. f / W k It may be represented by . W1 for each TRP may be the same, different, jointly selected, or individually selected. W for each TRP k These may be different, jointly selected, or individually selected. W for each TRP fThey may be the same, different, jointly selected, or individually selected.

[0108] A Type 2 codebook for CJT Multi-TRP (mTRP) may be at least one of the following codebook structures, or a combination of some of the following codebook structures.

[0109] [Codebook Structure 1A] SD / FD basis selection for each TRP / TRP group (port group or resource) + relative phase relationship (co-phasing) / amplitude relationship (including at least one of the wideband and subband). For example, the codebook structure is given by the following equation: TIFF0007848322000003.tif19167

[0110] Here, N is the number of TRPs or TRP groups. α r This is the amplitude relationship (co-amplitude). r This is a phase relationship (co-phase). This codebook is α r =p r =1 (no co-scaling) or α r This includes the special case where =0.

[0111] [Codebook Structure 1B] Joint SD / FD basis selection for each TRP / TRP group (port group or resource) + relative phase relationships / amplitude relationships (including at least one of wideband and subband). For example, the codebook structure is given by the following equation: TIFF0007848322000004.tif19167

[0112] Here, N is the number of TRPs or TRP groups. α r This is the amplitude relationship (co-amplitude).r This is a phase relationship (co-phase). This codebook is α r =p r =1 (no co-scaling) or α r This includes the special case where =0.

[0113] [Codebook Structure 2] SD basis selection per TRP / TRP group (port group or resource) and joint FD basis selection (spanning N TRPs). For example, the codebook structure is given by the following equation: TIFF0007848322000005.tif23167

[0114] Here, N is the number of TRPs or TRP groups.

[0115] (Problem #1) M v In determining the (FD basis), the following two options are being considered: [FD Basis 1] Common M across multiple TRPs v (Common M v (four FD bases) are used. In the example in Figure 5, the same M is used for the CSI of the 1st TRP, the CSI of the 2nd TRP, the CSI of the 3rd TRP, and the CSI of the 4th TRP. v N FD basis elements are used. In the following diagram, the horizontal axis represents the FD basis elements, the vertical axis represents the SD beam, and the colored elements indicate non-zero coefficients. [FD Basis 2] For each TRP, M has different sizes / positions v (Individual M v A set of FD bases is used. In the example in Figure 6, different M values ​​are used for the CSI of the 1st TRP, the CSI of the 2nd TRP, the CSI of the 3rd TRP, and the CSI of the 4th TRP. v Individual FD basis (M v,1 M v,2 M v,3 M v,4 The following FD bases are used.

[0116] However, FD basis / M v Details about the decision are unclear.

[0117] (Problem #2) For β (a parameter in paramCombination set by RRC) set by RRC to control the maximum number of non-zero coefficients for each layer and for all layers, the following two options are being considered: [Non-zero coefficient parameter 1] β for all TRPs. [Non-zero coefficient parameter 2] β differs for each TRP.

[0118] K0 is the maximum number of non-zero coefficients for each layer. 2K0 is the maximum number of non-zero coefficients for all layers, where K0 = ceil(β2LM1) or K0 = ceil(β2K1M). 2L is the number of SD beams in the Rel.16 Extended Type 2 codebook. K1 is the number of ports selected in the Rel.17 Port Selection codebook.

[0119] The maximum number of non-zero coefficients controls the upper limit of the PMI size that UE can report. A larger K0 results in better DL performance but also greater UCI overhead.

[0120] Furthermore, the introduction of the following restrictions is being considered. The maximum number of non-zero coefficients for each layer in all X TRPs within a single CSI-ReportConfig. The maximum number of non-zero coefficients for all layers in all X TRPs within a single CSI-ReportConfig.

[0121] In bitmaps reported to show non-zero coefficients, bitmaps for each TRP are being considered.

[0122] However, details regarding the restrictions / reporting of non-zero coefficients are unclear.

[0123] (Problem #3) Several options have been considered for determining and reporting the strongest coefficient indicator (SCI). [SCI1] One SCI per TRP. Additional amplitude / phase differences between the strongest reference coefficients from the 2nd / 3rd / 4th TRPs and the strongest reference coefficient from the 1st TRP may be reported. [SCI2] One SCI for each layer from all TRPs. [SCI3] M per TRP per layer v One SCI per unit. Additional amplitude / phase differences between the strongest reference coefficients from the second / third / fourth TRPs and the strongest reference coefficient from the first TRP may be reported. [SCI4] All M from each layer of all TRP v A single SCI spanning across.

[0124] For the strongest coefficient, it is preferable that its index be reported.

[0125] In the quantization of the coefficients, the strongest polarization of the SCI may be quantized to amplitude=1 and phase=0 and not reported, while other polarizations of the SCI may be quantized to 16 levels based on the strongest polarization. Other coefficients (not of the SCI) may be quantized to 8 levels for amplitude and 16 levels for phase.

[0126] However, details regarding SCI's decision / report are unclear.

[0127] Thus, the consideration of settings, decisions, and reporting related to CJT CSI is insufficient. Insufficient consideration of these aspects may lead to a decrease in communication throughput and communication quality.

[0128] Therefore, the inventors conceived a method for setting, determining, and reporting CJT CSI.

[0129] The embodiments relating to this disclosure will be described in detail below with reference to the drawings. Each of the following embodiments (for example, each case) may be used individually or at least two may be applied in combination.

[0130] In this disclosure, "A / B" and "at least one of A and B" may be interpreted as mutually exclusive. In this disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0131] In this disclosure, terms such as activate, deactivate, indicate, select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and operable may be interpreted interchangeably.

[0132] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, information elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0133] In this disclosure, the upper-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0134] In this disclosure, MAC signaling may include, for example, MAC Control Elements (MAC CEs) and MAC Protocol Data Units (PDUs). Broadcast information may include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), and Other System Information (OSIs).

[0135] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0136] In this disclosure, terms such as index, identifier (ID), indicator, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, and subset may be interpreted interchangeably.

[0137] In this disclosure, the terms used include: panel, panel group, beam, beam group, precoder, Uplink (UL) transmit entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relationship, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relationship group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) groups, PUCCH resource groups, resources (e.g., reference signal resources, SRS resources), resource sets (e.g., reference signal resource sets), CORESET pools, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, quasi-co-location (QCL), QCL assumptions, etc., may be interpreted interchangeably.

[0138] In this disclosure, panel, base station (gNB) panel, and TRP may be interpreted as interchangeable.

[0139] In this disclosure, the terms network (NW), base station, gNB, and TRP may be interpreted as interchangeable.

[0140] In this disclosure, time domain resource allocation and time domain resource assignment may be interpreted as mutually exclusive.

[0141] In this disclosure, beam, SD beam, SD vector, and SD 2D-DFT vector may be interpreted as mutually exclusive. L, 2L, number of SD beams, number of beams, and number of SD 2D-DFT vectors may be interpreted as mutually exclusive.

[0142] In this disclosure, FD basis, FD DFT basis, DFT basis, f i , may be interpreted as mutually exclusive. In this disclosure, FD beam, FD vector, FD basis vector, FD DFT basis vector, and DFT basis vector may be interpreted as mutually exclusive.

[0143] In this disclosure, the coupling coefficients, LC coefficients, subband complex LC coefficients, and coupling coefficient matrix may be interpreted as mutually exclusive.

[0144] In this disclosure, co-phasing, phase matching, phase compensation, phase adjustment, phase difference, and phase relationship may be interpreted interchangeably. In this disclosure, co-amplitude, amplitude compensation, amplitude adjustment, amplitude ratio, and amplitude relationship may be interpreted interchangeably. In this disclosure, difference, ratio, and relative value may be interpreted interchangeably.

[0145] In this disclosure, layer k and layer l may be interpreted as being interchangeable.

[0146] In this disclosure, size and length may be interpreted as mutually exclusive.

[0147] (Wireless communication method) In each embodiment, X TRPs, X-TRPs, X panels, and Ng panels may be interchangeable. In each embodiment, a CJT using X TRPs, a CJT using X panels, and an X-TRP CJT may be interchangeable.

[0148] In each embodiment, the reference CSI, the CSI for the reference TRP, and the first reported CSI may be interchangeable. In each embodiment, the reference TRP, the CSI corresponding to the reference CSI, the TRP corresponding to the first reported CSI, and the CSI-RS resource / CMR / CMR group / CSI-RS resource set corresponding to the first reported CSI may be interchangeable. In each embodiment, the TRP, CSI-RS resource, CMR, CMR group, and CSI-RS resource set may be interchangeable.

[0149] In each embodiment, multi-TRP, multi-panel, intra-site multi-TRP, and inter-site multi-TRP may be interpreted as mutually exclusive.

[0150] In each embodiment, inter-TRP, inter-panel, inter-TRP difference, and inter-TRP comparison may be interpreted interchangeably.

[0151] In each embodiment, inter-TRP CSI, inter-TRP CJT CSI, inter-panel CSI, CSI of another TRP relative to the CSI of a reference TRP, and CSI of another TRP relative to the CSI of a reference panel may be interpreted as mutually exclusive. In each embodiment, per-TRP CSI and per-panel CSI may be interpreted as mutually exclusive.

[0152] In each embodiment, the inter-TRP phase index and the inter-TRP phasing index may be interpreted as mutually exclusive. In each embodiment, the inter-TRP index and the inter-TRP coefficient index may be interpreted as mutually exclusive. In each embodiment, the inter-TRP phase matrix and the inter-TRP phasing matrix may be interpreted as mutually exclusive. In each embodiment, the inter-TRP matrix and the inter-TRP coefficient matrix may be interpreted as mutually exclusive. In each embodiment, the inter-TRP phase codebook and the inter-TRP phasing codebook may be interpreted as mutually exclusive. In each embodiment, the inter-TRP codebook and the inter-TRP coefficient codebook may be interpreted as mutually exclusive.

[0153] In each embodiment, the target resource, CMR, CSI-RS resource, NZP-CSI-RS resource, CMR group, CSI-RS resource set, NZP-CSI-RS resource set, and TRP may be interchangeable.

[0154] In each embodiment, the TRP inter-codebook, the multi-panel codebook for type 2 codebooks, and the inter-panel codebook may be interchangeable.

[0155] In each embodiment, the FD basis vector size, the number of FD basis vectors, and M v Size, M v M v,i The two can be read interchangeably.

[0156] In each embodiment, the terms "collocation of multiple TRPs / multiple CMRs" and "multiple TRPs within a site" may be interpreted interchangeably.

[0157] In each embodiment, the CSI report / content may be applied to subband reporting or to wideband reporting.

[0158] <Embodiment #1> This embodiment relates to problem #1.

[0159] The UE may determine multiple FD bases for multiple TRPs for CJT, either common to the multiple TRPs or individual to each TRP. The UE may send a CSI / codebook report based on the multiple FD bases.

[0160] 《FD basis 1》 Common M across multiple TRPs v A number of FD basis bases may be used. FD basis 1 may follow at least one of the following options:

[0161] [FD basis 1-1] SetM by NW v (The number / size of selected FD bases) is a common M across multiple TRPs. v That's fine.

[0162] [FD basis 1-2] NW is M v In addition to the value, you may also set a window of size N. UE will then select M from the window of size N. v Select individual FD basis vectors, M v The positions of the individual FD bases may be reported. FD bases 1-2 may follow at least one of the following options. [[FD basis 1-2A]] M v An N FD basis is given by a continuum of N FD bases. In the example in Figure 7, for the CSI of the 1st TRP, the CSI of the 2nd TRP, the CSI of the 3rd TRP, and the CSI of the 4th TRP, the same M in a window of size N. v A continuous FD basis is used. [[FD basis 1-2B]] M vAn N FD basis is given by discontinuous FD bases from N FD bases. In the example in Figure 8, for the CSI of the 1st TRP, the CSI of the 2nd TRP, the CSI of the 3rd TRP, and the CSI of the 4th TRP, the same M within a window of size N. v A discontinuous FD basis is used. In this case, for the i-th TRP, size N (size N × 2L) i The bitmap of ) is M v It may be used to indicate an FD base. Its bitmap is M v It may include one of several 1s. Alternatively, multiple sets of starting positions and lengths may be M v It may also be used to indicate individual FD bases.

[0163] N=M v If M v The location does not need to be reported.

[0164] [FD basis 1-3] NW is a window of size N and M v The maximum value (M v_max ) and can also be set. UE is a size M less than or equal to N. v And, M v You may report the position of each FD base.

[0165] FD basis 1-2 / 1-3 may be applied if certain conditions / constraints are met. For example, the condition may be at least one of the following conditions: ·M v However, it is greater than or less than a certain value. • The expansion type 2 port selection codebook is set. • The number of CMR / TRPs set is greater than or less than a certain value.

[0166] N provides the UE with the flexibility to select the SD / FD beams considering partial reciprocity in the FDD, as in the Rel.17 Type 2 port selection codebook. N may be used when a port selection codebook is configured. The window may be given by size and length. The delay of the starting position may be implicitly controlled by NW. NW can control an arbitrary delay in the start of the window. It may be assumed that M_init for the window is fixed at 0. In this case, the starting position of the window does not need to be specified.

[0167] In the Rel.17 Type 2 Port Selection Codebook, M v This is a parameter in paramCombination-r17. It is an extension based on the Rel.17 Type 2 Port Selection Codebook, M v This may also be a parameter within paramCombination-r18. In Rel.16 Type 2 Codebook, M v is, ceil(p v It is calculated by (N3 / R). Here, p v This is a parameter in paramCombination-r16. Therefore, in the extension based on the Rel.16 Type 2 codebook, M v is, ceil(p v The p calculated by (N3 / R) and set within paramCombination-r16 v It may also be related to this.

[0168] The window that shows N FD bases may follow at least one of the following windows.

[0169] [Window 1] That window (size N / start position) may be common to all TRP / CMR. That window may conform to at least one of the following windows 1-1 to 1-2. [[Window 1-1]] RRC IE may set the size N. The starting position may be assumed to be 0. [[Window 1-2]] RRC IE may set the size N and the starting position.

[0170] [Window 2] The window (size N / start position) may be set individually for each TRP / CMR. The window may follow at least one of the following windows 2-1 to 2-3. [[Window 2-1]] The window (N) set for the i+1th TRP i+1 The number of FD bases) is set for the window (N) of the i-th TRP. i It is a subset of the FD basis (of which there are n). In the example in Figure 9, each CSI of the first TRP is given a window (FD basis) of size N1. The window (FD basis) of size N2 for the CSI of the second TRP is a subset of the window (FD basis) for the CSI of the first TRP (N2 ≤ N1). The window (FD basis) of size N3 for the CSI of the third TRP is a subset of the window (FD basis) for the CSI of the second TRP (N3 ≤ N2). [[Window 2-2]] The window set for the i+1 TRP (N i+1 The number of FD bases) is set for the window (N) of the i-th TRP. i It overlaps with the FD basis (of which there are n). In the example in Figure 10, each CSI of the first TRP is given a window (FD basis) of size N1. The window (FD basis) of size N2 for the CSI of the second TRP overlaps with the window (FD basis) for the CSI of the first TRP (it includes at least a portion of the window for the CSI of the first TRP). The window (FD basis) of size N3 for the CSI of the third TRP overlaps with the window (FD basis) for the CSI of the second TRP (it includes at least a portion of the window for the CSI of the second TRP). [[Window 2-3]] The window set for the i+1 TRP (N i+1 (N) FD bases and the window set for the i-th TRP i There are no constraints between the individual FD bases and the other.

[0171] [Window 3] The window (size N / start position) may be set individually for each group of TRP / CMR. The window may follow at least one of the windows 2-1 to 2-3 described above.

[0172] 《FD basis 2》 For each TRP, there are multiple FD basis sets of different sizes M. v / Position may be used. FD basis 2 may follow at least one of the following options:

[0173] [FD basis 2-1] NW is M for multiple TRPs v A window (N FD bases) may be set for each TRP. v If the maximum number is set, the size M for the i-th TRP. v,i This may be set by the RRC and reported by the UE.

[0174] [FD basis 2-2] The window (N FD basis) is the FD basis (M) for the first TRP. v,1 It may be the same as the individual FD basis. M for the first TRP v Reporting may not be necessary. Size M for other TRPs. v / Positions may be reported. In the example in Figure 11, the window of N FD bases is M relative to the first TRP. v,1 This is the same as the individual FD basis. M for the second TRP v,2 The FD basis and M for the third TRP v,3 Each FD basis may be located within its window. v,2 A set of FD bases and M v,3The size and position of each FD basis may be reported.

[0175] [FD basis 2-3] M for each TRP v The N FD bases may be continuous FD bases (similar to FD bases 1-2A) or discontinuous FD bases (similar to FD bases 1-2B). In the example in Figure 12, the window of the N FD bases is M for the first TRP. v,1 This is the same as the individual FD basis. M for the first TRP v,1 The individual FD basis is continuous, and M for the second TRP v,2 The individual FD bases are discontinuous, and M for the third TRP v,3 The individual FD bases are discontinuous.

[0176] [FD basis 2-4] There may be constraints on the application of FD basis 2. For example, the constraint may be at least one of the following constraints: ·M v However, it is greater than or less than a certain value. • The port selection codebook is configured. • The number of CMR / TRPs set is greater than or less than a certain value. • M set for each TRP v The maximum value M v,i,max However, the TRP index i is in descending or ascending order (M v,1,max ≧M v,2,max ≧M v,3,max ≧M v,4,max Or M v,4,max ≧M v,3,max ≧M v,2,max ≧M v,1,max ). • M reported for each TRP v Value M v,i However, the TRP index i is in descending or ascending order (M v,1 ≧M v,2 ≧M v,3 ≧M v,4 Or M v,4 ≧M v,3 ≧M v,2 ≧M v,1 ). • M reported for each TRP v Value M v,i However, the TRP index i is in descending order (M v,1 ≧M v,2 ≧M v,3 ≧M v,41 In addition to the above, the actual M for the i+1th TRP v,i+1 The FD basis has M for the i-th TRP. v,i It is a subset of the FD basis.

[0177] In the example in Figure 13, the number of FD basis vectors for the first TRP, second TRP, and third TRP is M v,1 M v,2 M v,3 And M v,1 ≧M v,2 ≧M v,3 This is the case. M for the second TRP v,2 The FD basis is M for the first TRP. v,1 A subset of the FD basis, and M for the third TRP v,3 The FD basis is M for the second TRP. v,2 It is a subset of the FD basis.

[0178] 《FD basis 3》 For multiple CMR / TRPs directed within a single group of CMR / TRPs, a common M within that group v FD basis 1 may be applied to have this. FD basis 2 may be applied to multiple CMR / TRPs that span multiple groups (and are not in the same group). That is, FD basis bases of different sizes / positions may be applied between multiple groups.

[0179] The parameters set / reported in FD base 1 / 2 may be per CMR / TRP group, per CMR / TRP group, or may span multiple CMR / TRP groups. For example, size M v The settings / reporting may be done per CMR group, vThe reporting of the position of each FD basis may be for each CMR group. The constraint of FD basis 1 / 2 may be applied within a CMR group or to multiple CMR groups.

[0180] In the example in Figure 14, the first CMR group is associated with the CSI of the first TRP and the CSI of the second TRP, and the second CMR group is associated with the CSI of the third TRP and the CSI of the fourth TRP. For the two TRPs within the first CMR group, a common M v 1 =4 FD basis bases are used. For the two TRPs in the second CMR group, a common M v 2 =Two FD bases are used. v 2 The position of an FD basis may be reported as a position within N FD basis bases, or M v 1 The relative position to each FD base may also be reported.

[0181] In the example in Figure 15, the first CMR group is associated with the CSI of the first TRP and the CSI of the second TRP, the second CMR group is associated with the CSI of the third TRP, and the third CMR group is associated with the CSI of the fourth TRP. The second and third CMR groups do not need to be associated with a group index. Within the first CMR group, N=M for the two TRPs. v 1 =The four FD bases are common. Within the second CMR group, M v 2 =Two FD bases are used. Within the third CMR group, M v 3 =Two FD bases are used. v 2 Individual FD basis, M v 3 The position of an FD basis may be reported as a position within N FD basis bases, or M v1 The relative position to each FD base may also be reported.

[0182] For multiple CMR / TRPs indicated within a single group, the same SD beam may be implied / assumed for multiple CMR / TRPs within that group. The RRC IE may be configured to assume the same SD beam for measurements / reports for multiple CMR / TRPs within a single group.

[0183] In the example in Figure 16, the first CMR group is associated with the CSI of the first TRP and the CSI of the second TRP, and the second CMR group is associated with the CSI of the third TRP and the CSI of the fourth TRP. Within the first CMR group, the same 2L is applied to the first TRP and the second TRP. 1 Individual SD beams are used. Within the second CMR group, the same 2L is used for the third and fourth TRPs. 2 Individual SD beams are used.

[0184] In the example in Figure 17, the first CMR group is associated with the CSI of the first TRP, and the second CMR group is associated with the CSI of the second TRP, the CSI of the third TRP, and the CSI of the fourth TRP. Within the first CMR group, for the first TRP, 2L 1 A single SD beam is used. Within the second CMR group, the same 2L is used for the second TRP, third TRP and fourth TRP. 2 Individual SD beams are used.

[0185] The use of FD bases 1 / 2 / 3 may be specified in the specification or configured by the RRC IE. The signaling may be per CMR / per CMR group / per CSI-ReportConfig.

[0186] According to this embodiment, the UE can appropriately determine / report the FD basis for CJT CSI.

[0187] <Embodiment #2> This embodiment relates to the non-zero coefficient parameter of problem #2.

[0188] The UE may receive one or more parameters (non-zero coefficient parameters, e.g., β) for a plurality of TRPs for the CJT. Based on the one or more parameters, the UE may determine the maximum number of non-zero coefficients for the plurality of TRPs.

[0189] 《Non-zero coefficient parameter 1》 β may be set for all TRPs.

[0190] 《Non-zero coefficient parameter 2》 A different β may be set for each TRP.

[0191] At least one of the following constraints may be present. • Beta set for each TRP (beta i The order may follow the descending or ascending order of the TRP index i (β1≧β2≧β3≧β4 or β4≧β3≧β2≧β1). The β set for each TRP is the maximum number of non-zero coefficients (K) for each layer of each TRP, or for all layers of each TRP. 0,i ) follows the descending or ascending order of TRP index i (K 0,1 ≧K 0,2 ≧K 0,3 ≧K 0,4 or K 0,4 ≧K 0,3 ≧K 0,2 ≧K 0,1 You may want to check this. The β set for each TRP is the maximum number of non-zero coefficients (K) for each layer of each TRP, or for all layers of each TRP. 0,i ) is the same for each TRP (K 0,1 =K 0,2 =K0,3 =K 0,4 You may want to check this.

[0192] 《Non-zero coefficient parameter 3》 The β values ​​for one or more TRPs within a certain CMR group may be different from the β values ​​for one or more TRPs within different CMR groups.

[0193] At least one of the following constraints may be present. The β value set for each CMR / TRP group may follow the descending or ascending order of the group index. The β value set for each CMR / TRP group may be used to ensure that the maximum number of non-zero coefficients for each layer within a group, or for all layers within a group, follows the descending or ascending order of the group index. The β value set for each CMR / TRP group may be used to ensure that the maximum number of non-zero coefficients for each layer within a group, or for all layers within a group, is the same for each group.

[0194] For Y TRPs within a group, if each TRP has a different SD beam, then K0 = Σ i=1 Y K 0,i This may also be the case. If the SD beam for each TRP is the same for Y TRPs in a group, then K0 = K 0,1 =...=K 0,Y That's fine.

[0195] Furthermore, at least one of the following constraints (which depend on UE capabilities) may be introduced: • The maximum number of non-zero coefficients for each layer in the CMR / TRP group within CSI-ReportConfig. • The maximum number of non-zero coefficients for all layers in a CMR / TRP group within CSI-ReportConfig.

[0196] The use of non-zero coefficient parameters 1 / 2 / 3 may be specified in the specification or set by the RRC IE. The signaling may be per CMR / per CMR group / per CSI-ReportConfig.

[0197] The UE can verify that the reported actual number of non-zero coefficients follows a descending order relative to the reported CRI. For example, if CMR#2 is reported as the strongest point, as is the first reported CRI, then TRP#2 may be reported with the largest actual number of non-zero coefficients. For example, if CMR#3 is reported as the weakest point, as is the last reported CRI, then TRP#3 may be reported with the smallest actual number of non-zero coefficients.

[0198] According to this embodiment, the UE can appropriately determine / report the non-zero coefficient for the CJT CSI.

[0199] <Embodiment #3> This embodiment relates to a bitmap for non-zero coefficients in problem #2.

[0200] Bitmap 1 A bitmap for each TRP may be reported. In the Rel.16 Type 2 codebook, the size of each bitmap is 2LM. In the Rel.17 Type 2 port selection codebook, the size of each bitmap is K1M. X individual bitmaps may be reported.

[0201] Bitmap 2 A single bitmap (joint bitmap) may be reported for all TRPs (X TRPs). The size of that joint bitmap is Σ i=1 X 2L i M i It may be, Σ i=1 X K 1,i M i That's fine.

[0202] Bitmap 3 A bitmap for each group of CMR / TRPs may be reported. If each TRP has a different SD beam, the number of bits in the bitmap for Y TRPs in one group is Σ i=1 Y 2L i M i It may be, Σ i=1 Y K 1,i M i This may also be the case. If the SD beam for each TRP in a group is the same, the number of bits in the bitmap for Y TRPs in a group is 2L. i M i It's fine, K 1,i M i That's fine.

[0203] In the example in Figure 18, the first CMR group is associated with the CSI of the first TRP and the CSI of the second TRP. In the CSI of the first TRP and the CSI of the second TRP, the same N=M v 1 =4 FD basis values ​​are used. Within the first CMR group, different SD beams are used for the first TRP and the second TRP. 2L1 SD beams are used for the first TRP, and 2L2 SD beams are used for the second TRP. The number of bits in the bitmap for the first CMR group is 2L1M v 1 +2L2M v 1 That's fine.

[0204] In the example in Figure 19, the first CMR group is associated with the CSI of the first TRP and the CSI of the second TRP. The same N=M exists for both the first and second TRPs. v 1 =Four FD bases are used. Within the first CMR group, the same 2L is used in the first TRP and the second TRP. 1Several SD beams are used. The number of bits in the bitmap for the first CMR group is 2L 1 M v 1 That's fine.

[0205] The use of bitmaps 1 / 2 / 3 may be specified in the specification or set by the RRC IE.

[0206] According to this embodiment, the UE can appropriately determine / report the bitmap for non-zero coefficients of the CJT CSI.

[0207] <Embodiment #4> This embodiment relates to problem #3.

[0208] 《SCI1》 One SCI may be reported for each TRP and layer. Additional amplitude / phase differences may be reported between the strongest reference coefficients from the second / third / fourth TRPs and the strongest reference coefficient from the first TRP. The amplitude / phase of the strongest reference coefficient from the first TRP and the relative amplitude / phase of the strongest reference coefficients from the second / third / fourth TRPs, with the amplitude / phase of the strongest reference coefficient from the first TRP as the reference amplitude / phase, may also be reported.

[0209] 《SCI2》 One SCI may be reported for each layer from all TRPs.

[0210] 《SCI3》 TRPi layer by layer M v,i One SCI may be reported for each FD basis. Additional amplitude / phase differences may be reported between the strongest reference coefficients from the second / third / fourth TRPs and the strongest reference coefficient from the first TRP.

[0211] 《SCI4》 All M for each layer from all TRPs v,i A single SCI spanning multiple FD bases may be reported.

[0212] 《SCI5》 One SCI may be reported for each CMR / TRP group or layer.

[0213] The amplitude / phase difference between the strongest reference coefficient from the second / third / ... groups and the strongest reference coefficient from the first group may also be reported.

[0214] In the example in Figure 20, the first CMR group is associated with the CSI of the first TRP and the CSI of the second TRP, and the second CMR group is associated with the CSI of the third TRP and the CSI of the fourth TRP. For the two TRPs within the first CMR group, a common M v 1 A set of FD bases is used. For the two TRPs in the second CMR group, a common M v 2 A set of FD bases is used. One SCI is reported for each CMR group, and the difference in amplitude / phase of the SCI in the second CMR group is additionally reported (with the amplitude / phase of the SCI in the first CMR group as the reference amplitude / phase) relative to the amplitude / phase of the SCI in the first CMR group.

[0215] 《SCI6》 In addition to SCI1 / 2 / 3 / 4 / 5, SCIs for each polarization may be added.

[0216] For example, in SCI6+1, one SCI may be reported for each TRP, layer, and polarization.

[0217] In the example in Figure 21, two polarizations are used for each TRP, for the CSI of the first TRP and the CSI of the second TRP. A common M is used for the two TRPs. v A single FD basis is used. One SCI is reported for each TRP and polarization.

[0218] For example, in SCI6+2, one SCI may be reported for each layer and polarization for every TRP.

[0219] In the example in Figure 22, two polarizations are used for each TRP, for the CSI of the first TRP and the CSI of the second TRP. A common M is used for the two TRPs. v A set of FD bases is used. For every TRP, one SCI is reported for each polarization. In this example, the SCI for the first polarization of all TRPs and the SCI for the second polarization of all TRPs are reported.

[0220] The amplitude / phase difference between the strongest reference coefficients from the two polarizations may also be reported.

[0221] SCI1 / 2 / 3 / 4 / 5 / 6 will be used (SCI will be used per polarization / per layer / M v Whether reports are made per FD basis / per TRP / per TRP group / per TRP (for example, in relation to the number of TRPs) may be specified in the specification or set by the RRC IE. The signaling may also be per CMR / per CMR group / per CSI-ReportConfig. The settings may differ between different groups of CMRs / TRPs or between different CMRs / TRPs.

[0222] For the strongest TRPs, SCI is effective for each TRP, layer, and polarization. For weaker TRPs, SCI for each TRP or TRP group with high-level quantization is sufficient, reducing the overhead of CSI reporting.

[0223] Other polarizations of the SCI may be 8-level amplitude quantized. Whether other polarizations of the SCI are 16-level or 8-level amplitude quantized may be determined by the RRC IE. The amplitude quantization levels of the SCI (each polarization) in each of SCI1 / 2 / 3 / 4 / 5 / 6 may be specified in the specification or determined by the RRC IE. The amplitude / phase quantization levels of the non-SCI (each polarization) in each of SCI1 / 2 / 3 / 4 / 5 / 6 may be specified in the specification or determined by the RRC IE.

[0224] For weaker TRPs, reporting overhead can be reduced by setting the phase quantization level to 8 levels instead of 16 levels.

[0225] According to this embodiment, the UE can appropriately determine / report the SCI for the CJT CSI.

[0226] <Embodiment #A1> If, for the purpose of CJT CSI, it is stipulated that CSIs for each TRP be reported within a single CSI report, then one or more of the following constraints 1 to 3 may be considered for each TRP's CSI.

[0227] 《Constraint 1》 The same RI is assumed for each CSI measurement for each TRP. Only common RI reports may be required. For example, an RI report may be included in the first CJT CSI, but not in the second, third, or fourth CJT CSIs. If the RI reports differ for each CSI for each TRP, it becomes difficult for the base station to update those RIs for the CJT CSIs.

[0228] 《Constraint 2》 For each TRP, at least one of a common parameter and a distinct parameter is set. Here, each TRP, each CMR, each CMR group, and each CMR set may be interchangeable. The parameter may be represented by at least one of the following parameter fields. • Supported parameter (codebook parameter) combinations (L,p v A field (paramCombination) that indicates a value / index corresponding to a combination of at least one value of β, α, and M. • A field indicating how the PMI subbands are defined for each CQI subband (numberOfPMI-SubbandsPerCQI-Subband). • The number of beams L (number of beams) used in linear combination. • PSK alphabet size, QPSK or 8-PSK (phaseAlphabetSize). • The field (subbandAmplitude) is true if subband amplitude reporting is activated. The value of N (for example, the parameter N∈{2,4} is set when M=2) (valueOfN).

[0229] In Rel.15 / 16 / 17, these parameters are set for each CodebookConfig and each CSI-ReportConfig. In the CJT CSI configuration, some of these parameters may be set for each TRP. In that CJT CSI configuration, the CSI of the second / third / fourth TRP may have a coarser feedback granularity and less overhead than the CSI of the first TRP. In paramCombination, different (L,p v A combination of ,β) may be set. For CJT CSI settings, paramCombination may be used to set some parameters common to TRP (e.g., common L) and some parameters specific to TRP (e.g., p) v,β) and may be set.

[0230] Figure 23A shows W for the first TRP. ~ And, W for the second TRP ~ And, an example is shown. As in this example, different SD beam numbers L(L1,L2) may be set for the CSI of the first TRP and the CSI of the second TRP.

[0231] Figure 23B shows W for the first TRP. ~ And, W for the second TRP ~ Here is another example. As in this example, the same number of SD beams L and different maximum numbers of NZCs for each layer (β=1 / 2, 1 / 4) may be set for each TRP.

[0232] 《Constraint 3》 Within CSI-ReportConfig, at least one of the following settings 3a to 3d is implemented for all X TRPs (all CMRs / IMRs). [Setting 3a] The maximum number of non-zero coefficients (NZCs) for each layer of X TRPs in CSI-ReportConfig. [Setting 3b] The maximum number of NZCs for all layers of X TRPs in CSI-ReportConfig. [Setting 3c] The maximum number of SD beams for all X TRPs in CSI-ReportConfig. [Setting 3d] Number of FD basis vectors (FD basis vector size) M for all X TRPs in CSI-ReportConfig v The maximum number.

[0233] UE capability signaling may be introduced for at least one of constraints 1 to 3.

[0234] According to this embodiment, the UE can appropriately report CSIs for each of the X TRPs in a single CSI report based on constraints / relationships.

[0235] <Embodiment #A2> If, for CJT CSI, it is configured that CSI per TRP is reported within a single CSI report, the measurement sequence / operation may follow at least one of operations 1 through 4 below.

[0236] 《Operation 1》 First, the best TRP / CRI / CSI (CSI of the first TRP, CJT CSI of the first CJT) is selected (assuming single TRP reception). Next, assuming 2-TRP CJT reception, the CSI of the second TRP is measured based on the CJT CSI of the first TRP. Next, assuming 3-TRP CJT reception, the CSI of the third TRP is measured based on the CSIs of the first and second CJT CSIs. Next, assuming 4-TRP CJT reception, the CSI of the fourth TRP is measured based on the CSIs of the first, second, and third CJT CSIs. In this case, the UE may assume different receiving beamforming matrices for the measurement of the second, third, and fourth TRP CSIs.

[0237] 《Operation 2》 First, the best TRP / CRI / CSI (CSI of the first TRP, CSI of the first CJT) is selected (assuming single TRP reception). Next, assuming 2-TRP CJT reception, the CSI of the second TRP (and similarly, the CSIs of the third and fourth TRPs) is measured based on the CSI of the first CJT. In this case, the UE may assume the same receive beamforming matrix for the measurements of the second, third, and fourth TRP CSIs.

[0238] 《Operation 3》 First, the best TRP / CRI / CSI (CSI of the first TRP, CSI of the first CJT) is selected (assuming single TRP reception). Next, assuming 4-TRP CJT reception, the CSIs of the second, third, and fourth TRPs are measured based on the CSI of the first CJT. In this case, the UE may assume the same receive beamforming matrix for measuring the CSIs of the second, third, and fourth TRPs.

[0239] 《Operation 4》 Assuming a 4-TRP CJT reception, the CSI of the 1st, 2nd, 3rd, and 4th TRPs are measured. In this case, the UE may assume the same receive beamforming matrix for the measurement of the 1st, 2nd, 3rd, and 4th TRP CSIs.

[0240] UE capability signaling may be introduced for at least one of operations 1 through 4.

[0241] According to this embodiment, UE can be adequately measured for reporting CSI per X TRPs within a single CSI report.

[0242] <Embodiment #A3> For inter-TRP CSI / PMI (e.g., inter-TRP amplitude and inter-TRP phase, or inter-TRP phase only), the UE may comply with at least one of the following reports 1 or 2.

[0243] 《Report 1》 Prior to (above) the existing Rel.16 / 17 Type 2 codebooks, there may be independent codebooks and feedback for CSI / PMI between TRPs. CSI / PMI between TRPs may follow at least one of the following reports 1A to 1B.

[0244] [Report 1A] The size of matrix W2 for CSI / PMI between TRPs is 1×1. This may mean that inter-TRP PMI between two TRPs is considered. In this case, W2 may be common to multiple layers.

[0245] [Report 1B] The size of matrix W2 for CSI / PMI between TRPs is N t ×N t Alternatively, it is K×K based on Rel.17 Type 2 port selection CSI. This may mean that inter-TRP PMI between each antenna port from two TRPs is considered. In this case, W2 may be common to multiple layers.

[0246] The first CJT CSI for layer l of the first TRP (best TRP) may be expressed by the following formula: W l,1 (N t ×N3) = W1W ~ k W f,k H (a-1)

[0247] The first CJT CSI for layer l of the first TRP (best TRP) may be expressed by the following formula: W' l,i (N t ×N3) = W 2,i W1W ~ k W f,k H (a-2) W 2,i (1×1) or W 2,i (N t ×N t ), where i may be an index for the TRP / CMR / CMR group.

[0248] The base station operates on the same principle as the multi-panel codebook, W 2,i Based on the report, the 4-TRP CJT CSI may be updated. In this example, the base station uses the following formula to update the reported W for layer l of TRP#i(i={2,3,4}). 2,i Using W' l,i You may update it. TIFF0007848322000006.tif26167

[0249] 《Report 2》 Matrix W2 for CSI / PMI between TRPs is W ~ k W f,k H It may be transmitted together with W ~ k W f,k HIt may be communicated internally. CSI / PMIw2 between TRPs may follow at least one of the following reports 2a to 2b.

[0250] [Report 2a] For the second / third / fourth CJT CSI measurements, the FD basis and coefficients are common M across multiple TRPs. v (Common FD basis W f,k Common M settings / instructions from ) v From there, measured in conjunction with the first CJT CSI, the coefficient W for their TRP was used. ~ k These may be jointly selected and reported within the CSI for each TRP. The coefficient reporting may follow at least one of the following reports 2a-1 to 2a-2.

[0251] [[Report 2a-1]] In the coefficient reporting for each TRP, existing reports may be reused. That is, one strongest coefficient indicator (SCI) may be reported for each TRP and layer. It may have amplitude=1 and phase=0 as a reference coefficient. Other coefficients for each TRP and layer may be quantized based on that reference coefficient. The amplitude / phase difference between the strongest reference coefficients from the second / third / fourth TRPs and the strongest reference coefficient from the first TRP may be added and reported.

[0252] In the example in Figure 24, for each TRP and layer, one SCI report and quantization for each TRP are performed, and the amplitude / phase difference between the reference coefficient from the first TRP and the reference coefficients from the other TRPs may be added and reported. In this example, the amplitude / phase of the SCI beam for each TRP is not reported, but the amplitude / phase difference between the reference coefficient from the first TRP and the reference coefficients from the other TRPs is reported.

[0253] [[Report 2a-2]] For coefficient reports spanning multiple (all) TRPs, within the first TRP CSI, one strongest coefficient indicator (SCI) is reported per layer from all TRPs, and other coefficients per TRP and per layer may be quantized based on this strongest coefficient. This strongest coefficient may have amplitude=1 and phase=0 as a reference coefficient. Other coefficients per TRP and per layer may be quantized based on this reference coefficient. Therefore, within the second / third / fourth TRP CSI, SCI reporting per TRP CSI is not required, and the amplitude / phase of the original SCI may be quantized and fed back based on a common SCI, similar to other non-SCI beams. The original SCI per TRP may have amplitude=1 and phase=0 as a reference. Therefore, the amplitude / phase of the SCI per TRP does not need to be reported in report 2a-1.

[0254] In the example in Figure 25, one SCI report and quantization across all TRPs may be performed for each layer, spanning all TRPs. In this example, the original SCI is not reported within the second / third / fourth TRP CSI, but the amplitude / phase of the original SCI beam for each TRP may be reported.

[0255] [Report 2b] For the second / third / fourth CJT CSI measurements, the FD basis and coefficients are measured together with the first CJT CSI, starting from the larger FD basis set. For each TRP, the principal coefficients may be dispersed within different FD basis sets for each TRP. In this case, for each TRP, different M v,i The size and at least one of the different starting offsets within the FD base may be reported. This report may be layer-specific for each TRP or common to multiple layers for each TRP. The coefficient report may follow at least one of the following reports 2b-1 to 2b-2.

[0256] [[Report 2b-1]] In the coefficient reporting for each TRP, existing reports may be reused. That is, for each TRP, for each layer, M v,i For each, one strongest coefficient indicator (SCI) may be reported. It may have amplitude = 1 and phase = 0 as a reference coefficient. For each TRP, per layer, M v,i Each other coefficient may be quantized based on its reference coefficient. The amplitude / phase difference between the strongest reference coefficient from the second / third / fourth TRP and the strongest reference coefficient from the first TRP may be added and reported.

[0257] Each TRP, each layer, M v,i For each step, a report of one SCI and quantization for each TRP may be performed.

[0258] In the example in Figure 26, for TRP#i(i={1,2,3,4}), M is less than or equal to the set number of FD basis vectors (FD basis vector size). v,i The UE may set the starting offset for the selected FD basis. v,i Using these FD basis, W f,k , W ~ k The number of SD beams (SD DFT vectors) L may be determined for TRP#i. i This may be set. For each TRP, SCI may be selected / reported from the selected FD base and the set SD beam.

[0259] [[Report 2b-2]] For coefficient reports spanning multiple (all) TRPs, within the first TRP CSI, all M per layer from all TRPs v,iA single maximum coefficient indicator (SCI) spanning across the TRPs is reported, and other coefficients per TRP, per layer, and based on this maximum coefficient, other coefficients may be quantized. This maximum coefficient may have amplitude=1 and phase=0 as a reference coefficient. Other coefficients per TRP, per layer, and based on this reference coefficient may be quantized. Therefore, within the second / third / fourth TRP CSI, SCI reporting per TRP CSI is not required, and the amplitude / phase of the original SCI may be quantized and fed back based on the common SCI, similar to other non-SCI beams. M specific to the TRP v The reporting of coefficients for each TRP, excluding the determination and reporting of the coefficients for each TRP, and the reporting of coefficients spanning multiple TRPs may be the same as in reports 2a-1 / 2a-2.

[0260] For each TRP, for each layer, all M v,i A report of one SCI spanning across, and all M per TRP, per layer. v,i Quantization spanning multiple ranges may also be performed.

[0261] M for each TRP v The size may be determined according to at least one of the following size determination methods 1 and 2. [Size determination method 1] M for each TRP (or common to all TRPs) v The size may be set by RRC. UE sets M for each TRP. v You may determine the starting offset. [Size determination method 2] M of each TRP v The maximum size of may be specified in the specification or set by RRC. Based on the implementation (for example, taking into account the variance of good coefficients), the M of each TRP v You can decide on the size.

[0262] Variations M v,i It may be discontinuous. Therefore, discontinuous M v,i To notify each M v,iIt may also be necessary to report the FD basis index for [the given value].

[0263] In Report 2, the PMI between TRPs was W ~ k W f,k H It may be transmitted together with W ~ k W f,k H It may be transmitted internally. Inter-TRP CSI may be applied to such inter-TRP PMI.

[0264] Report 2b shows a smaller TRP-specific M compared to Report 2a. v By using this method, feedback overhead can be reduced.

[0265] UE reports 2a (M common to multiple TRPs) v ) and report 2b (M specific to TRP) v ) may support both. Reports 2a and 2b may be switched based on the number of FD base / subbands, etc.

[0266] According to this embodiment, the UE can appropriately report CSI / PMI between TRPs.

[0267] <Supplement> At least one of the embodiments described above may apply only to a UE that has reported or supports a particular UE capability.

[0268] The specific UE capability may represent at least one of the following: • To support specific processing / operation / control / information for at least one of the above embodiments. • Support for CJT CSI based on Rel.16 Extended Type 2 CSI. • Supports CJT CSI based on Rel.17 extended type 2-port selectable CSI. • Common M across multiple TRP / CMR v(M v (Individual FD bases), or individual M for each TRP / CMR v (M v (Individual FD bases), or individual M for each group of TRP / CMR v (M v Supporting a continuous M (FD basis). v Supporting individual FD bases. Discontinuous M v Support a number of FD bases. Size of the FD base: M v Support location reporting. • Support for setting a window for the FD base and the value of its size N. • Support for the same β setting for each TRP, each TRP group, or all TRPs. • Support for different β settings for each TRP, each TRP group, or all TRPs. • Support for setting the value of β. The maximum number of non-zero coefficients for each layer for each TRP, or each TRP group, or all TRPs, or CSI-ReportConfig. • Support the reporting of bitmaps showing non-zero coefficients for each TRP, each TRP group, or all TRPs. · By polarization / by layer / by TRP / M v Support SCI for each TRP, each TRP group, and all TRPs. Support the same settings for different TRPs / TRP groups. Support different settings for different TRPs / TRP groups. • Supporting different quantization levels for the two polarizations of SCI. • Support different quantization levels for SCI / non-SCI from different TRP / TRP groups.

[0269] Furthermore, the specific UE capabilities described above may be capabilities that apply across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., cell, band, BWP), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities per subcarrier spacing (SCS).

[0270] Furthermore, the specific UE capabilities described above may be capabilities that apply across all duplexing schemes (common to all duplexing schemes), or they may be capabilities specific to each duplexing scheme (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0271] Furthermore, at least one of the embodiments described above may be applied when the UE is configured with specific information related to the embodiment described above by upper-layer signaling. For example, such specific information may be information indicating the activation of at least one of the embodiments described above, or arbitrary RRC parameters for a particular release (e.g., Rel.18).

[0272] If the UE does not support at least one of the above-mentioned specific UE capabilities or does not have the above-mentioned specific information configured, the behavior of, for example, Rel.15 / 16 may be applied.

[0273] (Note A) The following invention is added with respect to one embodiment of this disclosure. [Note 1] A control unit for determining multiple frequency domain bases common to or individual to multiple transmission / reception points (TRPs) for coherent joint transmission (CJT), wherein the TRPs are multiple transmission / reception points (TRPs), and A terminal having a transmitting unit that transmits a report of channel status information (CSI) based on the plurality of frequency domain bases. [Note 2] The control unit determines the multiple frequency domain bases from a window common to the multiple TRPs, or from individual windows for each TRP, as described in Appendix 1. [Note 3] The plurality of second frequency domain bases for the second TRP among the plurality of TRPs are terminals as described in Appendix 1 or Appendix 2, which include a plurality of first frequency domain bases for the first TRP among the plurality of TRPs. [Note 4] The control unit determines the plurality of frequency domain bases for a group associated with one or more TRPs among the plurality of TRPs, as described in any of the terminals described in Appendix 1 to Appendix 3.

[0274] (Note B) The following invention is added with respect to one embodiment of this disclosure. [Note 1] A receiving unit that receives one or more parameters for multiple transmit / receive points (TRPs) for coherent joint transmission (CJT), A terminal having a control unit that determines the maximum number of non-zero coefficients for the plurality of TRPs based on one or more of the aforementioned parameters. [Note 2] Each of the one or more parameters mentioned above corresponds to a terminal as described in Appendix 1, or to a group associated with one or more of the TRPs mentioned above. [Note 3] The terminal according to Appendix 1 or Appendix 2, wherein the control unit determines one bitmap representing the non-zero coefficient for the plurality of TRPs, or determines one bitmap representing the non-zero coefficient for each group associated with one or more TRPs among the plurality of TRPs. [Note 4] The control unit determines a group associated with one or more TRPs from the plurality of TRPs, polarization, and a strongest coefficient indicator, as described in any of Appendix 1 to Appendix 3.

[0275] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0276] Figure 27 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0277] Furthermore, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0278] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0279] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0280] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0281] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of Carrier Aggregation (CA) using multiple Component Carriers (CC) and Dual Connectivity (DC).

[0282] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may fall in a frequency band higher than FR2.

[0283] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0284] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0285] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0286] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0287] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0288] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0289] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0290] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0291] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0292] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0293] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0294] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a given search space based on the search space configuration.

[0295] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0296] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0297] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0298] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc., may be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc., may be transmitted.

[0299] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0300] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0301] (base station) Figure 28 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0302] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0303] The control unit 110 controls the entire base station 10. The control unit 110 can consist of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0304] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0305] The transmitting / receiving unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0306] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0307] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0308] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0309] The transmitting / receiving unit 120 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0310] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0311] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0312] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0313] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0314] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0315] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may also measure received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0316] The transmission path interface 140 may send and receive signals (backhaul signaling) with devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0317] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0318] The control unit 110 may determine a plurality of frequency domain bases for a plurality of transmit / receive points (TRPs) for coherent joint transmission (CJT), either common to the plurality of TRPs or individual to each TRP. The transmit / receive unit 120 may receive a report of channel status information (CSI) based on the plurality of frequency domain bases.

[0319] The transmitting / receiving unit 120 may transmit one or more parameters for a plurality of transmit / receive points (TRPs) for coherent joint transmission (CJT). The control unit 110 may control the reception of reports based on the one or more parameters, according to the maximum number of non-zero coefficients for the plurality of TRPs.

[0320] (User terminal) Figure 29 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0321] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0322] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0323] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0324] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0325] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0326] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0327] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0328] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0329] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc., on data and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0330] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0331] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0332] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0333] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0334] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0335] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0336] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0337] The control unit 210 may determine a plurality of frequency domain bases for a plurality of transmit / receive points (TRPs) for coherent joint transmission (CJT), either common to the plurality of TRPs or individual to each TRP. The transmit / receive unit 220 may transmit a report of channel status information (CSI) based on the plurality of frequency domain bases.

[0338] The control unit may determine the multiple frequency domain basis from a window common to the multiple TRPs, or from a window specific to each TRP.

[0339] The plurality of second frequency domain bases for the second TRP among the plurality of TRPs may include a plurality of first frequency domain bases for the first TRP among the plurality of TRPs.

[0340] The control unit may determine the plurality of frequency domain bases for a group associated with one or more TRPs among the plurality of TRPs.

[0341] The transmitting / receiving unit 220 may receive one or more parameters for a plurality of transmit / receive points (TRPs) for coherent joint transmission (CJT). The control unit 210 may determine the maximum number of non-zero coefficients for the plurality of TRPs based on the one or more parameters.

[0342] Each of the one or more parameters may correspond to each TRP, or to a group associated with one or more TRPs among the plurality of TRPs.

[0343] The control unit may determine one bitmap representing the non-zero coefficient for the plurality of TRPs, or it may determine one bitmap representing the non-zero coefficient for each group associated with one or more TRPs among the plurality of TRPs.

[0344] The control unit may determine the strongest coefficient indicator for a group associated with one or more TRPs among the plurality of TRPs, and for polarization.

[0345] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0346] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0347] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 30 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0348] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0349] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0350] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0351] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0352] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0353] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0354] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital multipurpose disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be called an auxiliary storage device.

[0355] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0356] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0357] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0358] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0359] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0360] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0361] Here, the neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0362] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0363] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0364] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0365] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0366] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0367] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0368] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0369] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0370] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0371] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0372] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0373] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0374] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0375] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0376] A BWP may include UL BWPs (BWPs for UL) and DL BWPs (BWPs for DL). One or more BWPs may be configured within a single carrier for a UE.

[0377] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0378] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots within a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0379] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0380] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements that use these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0381] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0382] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0383] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0384] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0385] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0386] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not notifying the specified information or by notifying other information).

[0387] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0388] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0389] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0390] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0391] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "quasi-co-location (QCL)," "transmission configuration indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," and "panel" may be used interchangeably.

[0392] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0393] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0394] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform a control / operation based on said information.

[0395] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0396] A mobile station may also be called a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate term.

[0397] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a moving object, the moving object itself, etc.

[0398] The term "mobile object" refers to any movable object, regardless of its speed, and naturally includes cases where the mobile object is stationary. Examples of such mobile objects include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and items carried on them. Furthermore, such mobile objects may be autonomously driven objects operating based on operational commands.

[0399] The mobile entity may be a vehicle (e.g., a car, an airplane), an unmanned mobile entity (e.g., a drone, an autonomous vehicle), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0400] Figure 31 shows an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a pneumatic pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0401] The drive unit 41 consists of, for example, at least one of an engine, a motor, or an engine-motor hybrid. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0402] The electronic control unit 49 consists of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 installed in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0403] Signals from various sensors 50-58 include current signals from current sensor 50 for sensing motor current, rotational speed signals of front wheels 46 / rear wheels 47 acquired by rotational speed sensor 51, air pressure signals of front wheels 46 / rear wheels 47 acquired by air pressure sensor 52, vehicle speed signals acquired by vehicle speed sensor 53, acceleration signals acquired by acceleration sensor 54, accelerator pedal depression signal of accelerator pedal 43 acquired by accelerator pedal sensor 55, brake pedal depression signal of brake pedal 44 acquired by brake pedal sensor 56, operation signals of shift lever 45 acquired by shift lever sensor 57, and detection signals for detecting obstacles, vehicles, pedestrians, etc., acquired by object detection sensor 58.

[0404] The information service unit 59 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, displays, television, and radio, and one or more ECUs that control these devices. The information service unit 59 uses information acquired from external devices via a communication module 60 or the like to provide various types of information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0405] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0406] The driver assistance system unit 64 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driver assistance functions or autonomous driving functions.

[0407] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 sends and receives data (information) via the communication port 63 to the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40.

[0408] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Alternatively, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 (it may function as at least one of the base station 10 and the user terminal 20).

[0409] The communication module 60 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above input.

[0410] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 installed in the vehicle. The information service unit 59 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[0411] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, various sensors 50-58, etc., which are provided in the vehicle 40.

[0412] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel and downlink channel may be interpreted as sidelink channel.

[0413] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0414] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0415] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0416] Each aspect / embodiment described in this disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may apply to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that are extended, modified, created, or defined based on these. It may also apply to combinations of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0417] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0418] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0419] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0420] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0421] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0422] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0423] The term "maximum transmit power" as used in this disclosure may mean the maximum value of the transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0424] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0425] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0426] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0427] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0428] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0429] In this disclosure, terms such as "less than or equal to," "less than," "greater than or equal to," "more than," and "equal to" may be interpreted interchangeably. In addition, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees. Furthermore, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees, by adding "i-th" (where i is any integer) to the expression (for example, "highest" may be interpreted interchangeably with "i-th highest").

[0430] In this disclosure, "of," "for," "regarding," "related to," and "associated with" may be interpreted as being interchangeable.

[0431] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

Claims

1. A control unit for determining multiple frequency domain bases common to or individual to multiple transmission / reception points (TRPs) for coherent joint transmission (CJT), and The system includes a transmitting unit that transmits a report of channel state information (CSI) based on the plurality of frequency domain bases, A plurality of second frequency domain bases for a second TRP among the plurality of TRPs, each terminal including a plurality of first frequency domain bases for a first TRP among the plurality of TRPs.

2. The terminal according to claim 1, wherein the control unit determines the plurality of frequency domain bases for the plurality of TRPs, either common to the plurality of TRPs or individual to each of the TRPs, based on settings by higher layer parameters.

3. The terminal according to claim 2, wherein the setting is performed for each CSI-ReportConfig.

4. The terminal according to claim 1, wherein the transmitting unit transmits capability information to each of the TRPs indicating that it supports the plurality of frequency domain bases common to the plurality of TRPs and that it supports the plurality of individual frequency domain bases.

5. A step of determining a plurality of frequency domain bases common to the plurality of transmit / receive points (TRPs) for coherent joint transmission (CJT), or individual to each TRP, The step of transmitting a report of channel state information (CSI) based on the plurality of frequency domain bases, A wireless communication method for a terminal, wherein a plurality of second frequency domain bases for a second TRP among the plurality of TRPs includes a plurality of first frequency domain bases for a first TRP among the plurality of TRPs.

6. A control unit for determining multiple frequency domain bases common to or individual to multiple transmission / reception points (TRPs) for coherent joint transmission (CJT), and The system includes a receiving unit that receives a report of channel state information (CSI) based on the plurality of frequency domain bases, A base station wherein a plurality of second frequency domain bases for a second TRP among the plurality of TRPs includes a plurality of first frequency domain bases for a first TRP among the plurality of TRPs.

7. A system including a terminal and a base station, The aforementioned terminal is A control unit for determining multiple frequency domain bases common to or individual to multiple transmission / reception points (TRPs) for coherent joint transmission (CJT), and The system includes a transmitting unit that transmits a report of channel state information (CSI) based on the plurality of frequency domain bases, The plurality of second frequency domain bases for the second TRP among the plurality of TRPs include a plurality of first frequency domain bases for the first TRP among the plurality of TRPs, The aforementioned base station is A control unit that determines the multiple frequency domain basis for the multiple TRPs, either common to the multiple TRPs or individual to each TRP, A system comprising a receiving unit that receives the CSI report.

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