Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit that receives one or more parameters for a plurality of transmission / reception points (TRP) used for coherent joint transmission (CJT); and a control unit that determines the maximum number of non-zero coefficients for the plurality of TRPs on the basis of the one or more parameters. According to one embodiment of the present disclosure, it is possible to determine an appropriate CSI / codebook for CJT.

Description

Technical Field

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system. Background Art

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8, 9 of the Third Generation Partnership Project (3GPP (registered trademark))).

[0003] LTE's successor systems (also known as the fifth generation mobile communication system (5G), 5G+(plus), the sixth generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] 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 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., NR), research is underway to report channel state information (CSI) based on the reception of reference signals. In addition, research is underway to perform DL transmissions from multiple transmission / reception points (multiple Transmission / Reception Points (TRPs) or Multi TRP (MTRP)) or multiple panels (multi-panel) to terminals (user terminals or User Equipment (UE)). In addition, research is underway to perform coherent joint transmission (CJT) using multiple TRPs or multiple panels.

[0009] However, sufficient research has not been conducted on CSI / codebooks used for CJT. If such a method is not clearly defined, there is a concern that communication throughput, communication quality, etc. may deteriorate.

[0010] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station for determining appropriate CSI / codebook for CJT.

[0011] Means for solving problems

[0012] A terminal according to one embodiment of the present disclosure includes: a receiving unit that receives one or more parameters for a plurality of transmission reception points (TRPs) for coherent joint transmission (CJT); and a control unit that determines a maximum number of non-zero coefficients for the plurality of TRPs based on the one or more parameters.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, it is possible to determine appropriate CSI / codebook for CJT. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 An example of a 16-level quantization table is shown.

[0016] Figure 2 An example of an 8-level quantization table is shown.

[0017] Figure 3A as well as Figure 3B An example of a Rel.16 type 2 port selection codebook is shown.

[0018] Figure 4A as well as Figure 4B An example of a Rel.17 type 2 port selection codebook is shown.

[0019] Figure 5 An example of the FD base 1 is shown.

[0020] Figure 6 An example of the FD substrate 2 is shown.

[0021] Figure 7 An example of the FD substrate 1-2A is shown.

[0022] Figure 8 An example of the FD substrate 1-2B is shown.

[0023] Fig. 9 An example of window (Window) 2-1 is shown.

[0024] Fig.10 An example of window 2-2 is shown.

[0025] Fig.11 An example of the FD substrate 2-2 is shown.

[0026] Fig.12 An example of the FD substrate 2-3 is shown.

[0027] Fig.13 An example of the FD substrate 2 - 4 is shown.

[0028] Fig.14 A first example of the FD substrate 3 is shown.

[0029] Fig.15 A second example of the FD substrate 3 is shown.

[0030] Fig.16 A third example of the FD substrate 3 is shown.

[0031] Fig.17 A fourth example of the FD substrate 3 is shown.

[0032] Fig.18 An example of bitmap 3 is shown.

[0033] Fig.19 Another example of bitmap 3 is shown.

[0034] Fig. 20 An example of SCI5 is shown.

[0035] Fig.21 An example of SCI6 is shown.

[0036] Fig. 22 Another example of SCI6 is shown.

[0037] Fig.23A as well as Fig. 23B This shows an example of restriction 2.

[0038] Fig.24 This shows an example of Report 2a-1.

[0039] Fig.25 This shows an example of Report 2a-2.

[0040] Fig.26 This shows an example of report 2b.

[0041] Fig. 27 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0042] Fig.28 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0043] Fig.29 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0044] Fig.30 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment.

[0045] Fig.31 This is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0046] (Multiple TRP)

[0047] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi TRP (multi TRP (MTRP))) are being studied using one or more panels (multi-panels) to perform DL transmissions to the UE. In addition, the UE is studying the use of one or more panels to perform UL transmissions to one or more TRPs.

[0048] In addition, multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0049] Multiple TRPs (TRP#1, #2) can also be connected through an ideal / non-ideal backhaul and exchange information, data, etc. Different code words (CW) and different layers can also be sent from each TRP of the multiple TRPs. As a method of sending multiple TRPs, non-coherent joint transmission (NCJT) can also be used.

[0050] In NCJT, for example, TRP1 performs modulation mapping and layer mapping on the first codeword, and uses the first precoding to send the first PDSCH for the first number of layers (e.g., two layers). In addition, TRP2 performs modulation mapping and layer mapping on the second codeword, and uses the second precoding to send the second PDSCH for the second number of layers (e.g., two layers).

[0051] In addition, multiple PDSCHs (multi-PDSCHs) subjected to NCJT can also be defined as partially or completely overlapping in at least one of the time domain and the frequency domain. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP can also overlap in at least one of the time and frequency resources.

[0052] It is also possible to assume that the first PDSCH and the second PDSCH are not in a quasi-co-location (QCL) relationship (not quasi-co-located). The reception of multiple PDSCHs may also be rewritten as simultaneous reception of PDSCHs of a certain QCL type (eg, QCL type D).

[0053] Multiple PDSCHs from multiple TRPs (also referred to as multiple PDSCHs) can also be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single-master mode). One DCI can also be sent from one TRP of multiple TRPs. Multiple PDSCHs from multiple TRPs can also be scheduled separately using multiple DCIs (multiple DCIs (M-DCI), multiple PDCCHs (multiplePDCCH)) (multiple-master mode). Multiple DCIs can also be sent separately from multiple TRPs. It can also be imagined that the UE sends separate CSI reports (CSI reports) related to each TRP for different TRPs. Such CSI feedback can also be referred to as separate feedback, separate CSI feedback, etc. In the present disclosure, "separate" can also be rewritten with "independent".

[0054] In addition, CSI feedback that sends CSI reports related to both TRPs to one TRP may also be used. Such CSI feedback may also be referred to as joint feedback, joint CSI feedback, etc.

[0055] For example, in the case of separate feedback, the UE is configured to use a certain PUCCH (PUCCH1) to send a CSI report for TRP#1 for TRP#1, and use another PUCCH (PUCCH2) to send a CSI report for TRP#2 for TRP#2. In the case of joint feedback, for TRP#1 or TRP#2, the UE sends a CSI report for TRP#1 and a CSI report for TRP#2.

[0056] Based on such a multi-TRP scenario, more flexible transmission control using channels of good quality can be performed.

[0057] (CSI report or CSI reporting)

[0058] In Rel.15NR, a terminal (also referred to as a user terminal, user equipment (UE), etc.) generates (also referred to as determining, calculating, estimating, measuring, etc.) channel state information (CSI) based on a reference signal (RS) (or resources used for the RS), and sends (also referred to as reporting, feedback, etc.) the generated CSI to a network (e.g., a base station). The CSI may be sent to a base station using, for example, an uplink control channel (e.g., a physical uplink control channel (Physical Uplink Control Channel (PUCCH))) or an uplink shared channel (e.g., a physical uplink shared channel (Physical Uplink Shared Channel (PUSCH))).

[0059] The RS used in the generation of CSI may be, for example, at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Broadcast Channel (SynchronizationSignal / Physical Broadcast Channel) (SS / PBCH) block, a Synchronization Signal (SS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), etc.

[0060] The CSI-RS may also include at least one of a non-zero power (NZP) CSI-RS and a CSI-Interference Management (CSI-IM). The SS / PBCH block is a block including the SS and the PBCH (and the corresponding DMRS), and may also be referred to as an SS block (SSB), etc. In addition, the SS may also include at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

[0061] In addition, CSI may also include at least one of a channel quality indicator (Channel Quality Indicator (CQI)), a precoding matrix indicator (Precoding Matrix Indicator (PMI)), a CSI-RS resource indicator (CSI-RSResource Indicator (CRI)), a SS / PBCH block resource indicator (SS / PBCH Block Resource Indicator (SSBRI)), a layer indicator (Layer Indicator (LI)), a rank indicator (Rank Indicator (RI)), L1-RSRP (reference signal received power in layer 1 (layer 1 reference signal received power (Layer 1 Reference Signal Received Power))), L1-RSRQ (reference signal received quality (Reference Signal Received Quality)), L1-SINR (signal to interference plus noise ratio (Signal to Interference plus Noise Ratio)), L1-SNR (signal to noise ratio (Signal to Noise Ratio)), etc.

[0062] The UE may also receive information related to CSI reporting (report configuration information) and control CSI reporting based on the report configuration information. The report configuration information may also be, for example, "CSI-ReportConfig" of the information element (IE) of the Radio Resource Control (RRC). In addition, in the present disclosure, the RRC IE may also be mutually rewritten with RRC parameters, high-layer parameters, etc.

[0063] The report configuration information (eg, "CSI-ReportConfig" of RRC IE) may include, for example, at least one of the following.

[0064] Information related to the type of CSI report (report type information, for example, "reportConfigType" of RRC IE)

[0065] Information on one or more quantities (quantities) of CSI to be reported (one or more CSI parameters) (report quantity information, for example, "reportQuantity" of RRC IE)

[0066] Information on RS resources used in generating the quantity (the CSI parameter) (resource information, for example, "CSI-ResourceConfigId" of RRC IE)

[0067] Information related to the frequency domain that is the subject of CSI reporting (frequency domain information, for example, "reportFreqConfiguration" of RRC IE)

[0068] For example, the report type information may also represent (indicate) a periodic CSI (Periodic CSI (P-CSI)) report, an aperiodic CSI (Aperiodic CSI (A-CSI)) report, or a semi-permanent (semi-persistent, semi-persistent (Semi-Persistent)) CSI report (Semi-Persistent CSI (SP-CSI)) report.

[0069] In addition, the reporting amount information may also specify a combination of at least one of the above-mentioned CSI parameters (for example, CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0070] In addition, the resource information may be an ID of a resource for RS. The resource for RS 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).

[0071] In addition, the frequency domain information can also represent the frequency granularity of the CSI report. The frequency granularity may also include, for example, a wideband and a subband. The wideband is the entire CSI reporting band (entire CSI reporting band). For example, the wideband may be the entirety of a certain (certain) carrier (component carrier (CC), cell, serving cell), or the entirety of the bandwidth part (Bandwidth part (BWP)) within a certain carrier. The wideband may also be referred to as the CSI reporting band, the entire CSI reporting band, etc.

[0072] In addition, a subband is a part of a wideband and may be composed of one or more resource blocks (Resource Block (RB) or Physical Resource Block (PRB)). The size of a subband may also be determined according to the size of a BWP (the number of PRBs).

[0073] The frequency domain information may also indicate which PMI of the wideband or subband is reported (the frequency domain information may also be included in the "pmi-FormatIndicator" of the RRC IE used in the determination of either the wideband PMI report or the subband PMI report, for example). The UE may also determine the frequency granularity of the CSI report (i.e., either the wideband PMI report or the subband PMI report) based on at least one of the above-mentioned reporting amount information and the frequency domain information.

[0074] In the case where wideband PMI reporting is set (determined), one wideband PMI may also be reported for the entire CSI reporting band. On the other hand, in the case where subband PMI reporting is set, a single wideband indication i1 may be reported for the entire CSI reporting band, or a subband indication i2 (e.g., a subband indication for each subband) may be reported for each of more than one subbands within the entire CSI reporting band.

[0075] The UE performs channel estimation using the received RS and estimates a channel matrix H. The UE feeds back an index (PMI) determined based on the estimated channel matrix.

[0076] The PMI may also represent a precoder matrix (also referred to as a precoder for short) that the UE considers suitable for downlink (downlink (DL)) transmission to the UE. Each value of the PMI may also correspond to a precoder matrix. A set of PMI values ​​may also correspond to a set of different precoder matrices and is referred to as a precoder codebook (also referred to as a codebook for short).

[0077] In the spatial domain, the CSI report may also include more than one type of CSI. For example, the CSI may also include at least one of the first type (type 1 CSI) used in the selection of a single beam and the second type (type 2 CSI) used in the selection of multiple beams. A single beam may also be referred to as a single layer, and multiple beams may also be referred to as multiple beams. In addition, type 1 CSI may not assume multi-user multiple input multiple output (MIMO), and type 2 CSI may assume multi-user MIMO.

[0078] The above codebook may also include a codebook for type 1 CSI (also referred to as type 1 codebook, etc.) and a codebook for type 2 CSI (also referred to as type 2 codebook, etc.). In addition, type 1 CSI may also include type 1 single-panel CSI and type 1 multi-panel CSI, and different codebooks (type 1 single-panel codebook, type 1 multi-panel codebook) may also be specified.

[0079] In the present disclosure, type 1 and type I may be replaced by each other. In the present disclosure, type 2 and type II may be replaced by each other.

[0080] The uplink control information (UCI) type may also include at least one of a hybrid automatic repeat request acknowledgment (HARQ-ACK), a scheduling request (SR), and CSI. UCI may be carried by either PUCCH or PUSCH.

[0081] In Rel.15NR, UCI can include a CSI part for wideband PMI feedback. CSI report #n contains PMI wideband information if reported.

[0082] In Rel.15NR, UCI can include two CSI parts for subband PMI feedback. CSI part 1 includes wideband PMI information. CSI part 2 includes one wideband PMI information and several subband PMI information. CSI part 1 and CSI part 2 are coded separately.

[0083] In Rel.15NR, the UE is configured with N (N≥1) report settings of CSI report settings and M (M≥1) resource settings of CSI resource settings through the higher layer. For example, the CSI report 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), report quantity (reportQuantity), etc. The resource settings for channel measurement, the CSI-IM resource settings for interference, and the NZP-CSI-RS settings for interference are associated with the CSI resource settings (CSI-ResourceConfig, CSI-ResourceConfigId), respectively. The CSI resource setting includes a list of CSI-RS resource sets (csi-RS-ResourceSetList, for example, an NZP-CSI-RS resource set or a CSI-IM resource set).

[0084] In order to realize the premise (hypotheses) of more dynamic channel / interference for NCJT for both FR1 and FR2, the evaluation and regulation of CSI reports for transmission of multiple TRPs and at least one of multiple panels in DL are being studied.

[0085] (Codebook Setting)

[0086] The UE is configured with parameters related to the codebook (codebook configuration (CodebookConfig)) through higher layer signaling (RRC signaling). The codebook configuration is included in the CSI report configuration (CSI-ReportConfig) of the higher layer (RRC) parameters.

[0087] In the codebook setting, at least one codebook of type 1 single panel (typeI-SinglePanel), type 1 multi-panel (typeI-MultiPanel), type 2 (typeII), and type 2 port selection (typeII-PortSelection) is selected.

[0088] The codebook parameters include parameters related to codebook subset restriction (CBSR) (...Restriction). The CBSR setting is a bit that indicates which PMI report is allowed ("1") or which PMI report is not allowed ("0") for the precoder associated with the CBSR bit. One bit of the CBSR bitmap corresponds to one codebook index / antenna port.

[0089] (CSI report settings)

[0090] In addition to the codebook configuration (CodebookConfig), the CSI report configuration (CSI-ReportConfig) of Rel.16 also includes 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. The parameters of CSI-ReportConfig except codebookConfig-r16 are also included in the CSI report configuration of Rel.15.

[0091] In Rel.17, an enhanced CSI report configuration (CSI-ReportConfig) for CSI measurement / reporting of multiple TRPs using NCJT is being studied. In this CSI report configuration, two CMR groups corresponding to each of the two TRPs are set. The CMRs in the CMR group can also be used for measurements of at least one of the multiple TRPs and single TRPs using NCJT. The N CMR pairs of NCJT are set through RRC signaling. The UE can also be set through RRC signaling whether to use the CMR of the CMR pair for single TRP measurement.

[0092] For CSI reports associated with NCJT measurements of multiple TRPs / panels configured through a single CSI report configuration, support for at least one of the following options 1 and 2 is being studied.

[0093] <Option 1>

[0094] The UE is configured to report X (X=0, 1, 2) CSIs associated with single TRP measurement assumptions and one CSI associated with NCJT measurement. In the case of X=2, the two CSIs are associated with two different single TRP measurements using CMRs of different CMR groups.

[0095] <Option 2>

[0096] The UE may also be configured to report a CSI associated with the best measurement result for NCJT and single TRP measurement assumptions.

[0097] As described above, in Rel. 15 / 16, CBSR is configured for each codebook configuration of each CSI report configuration. That is, CBSR is applied to all CMRs and the like in the corresponding CSI report configuration.

[0098] However, in the CSI report configuration for multiple TRPs based on Rel.17 of the CSI report configuration, when the above-mentioned options 1 and 2 are applied, it is possible to perform the following measurement configuration.

[0099] Option 1 (X=0): Measurement of CSI of NCJT only.

[0100] Option 1 (X=1): Measurement of CSI of NCJT and CSI of a single TRP (one TRP).

[0101] Option 1 (X=2): Measurement of CSI of NCJT and CSI of a single TRP (two TRPs).

[0102] Option 2: Measurement of both NCJT’s CSI and single TRP’s CSI.

[0103] (Type 1 codebook)

[0104] For base station panels, type 1 single panel codebook and type 1 multi-panel codebook are specified. In type 1 single panel, for the number of CSI-RS antenna ports P CSI-RS and (N1, N2) define the antenna model of the CSI antenna port array (logical setting). In the type 1 multi-panel, for the number of CSI-RS antenna ports P CSI-RS and (N g ,N1,N2), specifies the antenna model of the CSI antenna port array (logical setting).

[0105] For Rel.15 type 1 single panel CSI, the UE is set to type 1 single panel ('typeI-SinglePanel') in the higher layer parameters of the codebook type (subType in type1 in codebookType in CodebookConfig). If the number of layers v∈{2,3,4} is not, the PMI value is related to the three codebook indices i 1,1 ,i 1,2 , i2 corresponds. If the number of layers is v∈{2,3,4}, the PMI value corresponds to the 4 codebook indexes i 1,1 ,i 1,2 ,i 1,3 , i2 corresponds. If the number of layers is not v∈{2,3,4}, the composite codebook index i1=[i 1,1 ,i 1,2 If the number of layers is v∈{2,3,4}, the composite codebook index i1=[i 1,1 ,i 1,2 ,i 1,3 ].

[0106] For the number of CSI antenna ports P CSI-RS The supported (N1, N2) and (O1, O2) settings (combinations of values) are specified in the specification. (N1, N2) represents the number of antenna elements in two dimensions and is set by n1-n2 in moreThanTwo in nrOfAntennaPorts in typeI-SinglePanel. (O1, O2) is the two-dimensional oversampling factor. i corresponding to the horizontal beam 1,1 is {0,1,...,N1O1-1}. i corresponding to the vertical beam 1,2 is {0,1,...,N2O2-1}. i2 is {0,1,2,3}. For codebook mode (codebookMode) = 1, use antenna ports 3000 to 2999+P CSI-RS The matrix used in the 1-layer CSI report codebook is W_i 1,1 ,i 1,2 ,i2^(1). Here, W l,m,n (1) Given by the following formula.

[0107]

[0108] Compared with the type 1 single panel, for Rel.15 type 1 multi-panel CSI, in addition to N1 and N2, the number of panels N is also set. gAs inter-panel phase matching (inter-panel co-phasing, inter-panel phase compensation, inter-panel phase compensation between panels, inter-panel phase adjustment / phase difference), additional reports are added. 1,4 For each panel, the same SD beam is selected (precoding matrix W l ), only inter-panel phase matching is reported additionally.

[0109] For the number of CSI antenna ports P CSI-RS , the specification specifies the supported (N g ,N1,N2) and (O1,O2) settings (combination of values). (N1,N2) is set by ng-n1-n2 in typeI-MultiPanel. 1,1 is {0,1,...,N1O1-1}. 1,2 is {0,1,...,N2O2-1}. For q=1,...,N g -1,i 1,4,q = {0,1,2,3}. i2 = {0,1,2,3}. For codebook mode (codebookMode) = 1, use antenna ports 3000 to 2999+P CSI-RS The matrix used in the 1-layer CSI report codebook is 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.

[0110] For N g =W_l,m,p,n^1,N of {2,4} g ,1 and W_l,m,p,n^2,N g ,1(for layer 1, N g =2, codeBookMode = 1 l,m,p,n 1,2,1 , for layer 2, N g =2, codeBookMode = 1 l,m,p,n 2,2,1 , for layer 1, N g =4, codeBookMode = 1 l,m,p,n 1,4,1 , for layer 2, N g =4, codeBookMode = 1 l,m,p,n2,4,1 ) is given by the following formula.

[0111]

[0112] here, For N g =2, p=p1, for N g =4, p=[p1,p2,p3]. represents inter-panel co-phasing. For panels 0, 1, 2, and 3, the same beam is selected (SD beam matrix, precoding matrix W l ), represents the phase compensation of panel 1 relative to panel 0, represents the phase compensation of panel 2 relative to panel 0, Represents the phase compensation of panel 3 relative to panel 0.

[0113] (Type 2 codebook)

[0114] CSI acquisition for coherent joint transmission (CJT) for FR1 and up to 4 TRPs is being studied, assuming ideal backhaul, synchronization, and the same number of antenna ports across multiple TRPs. Improvements to the type 2 codebook of Rel.16 / 17 are being studied for CJT multi-TRPs for FDD.

[0115] In the present disclosure, a matrix Z of X rows and Y columns is sometimes expressed as Z(X×Y).

[0116] Regarding the type 2 CSI of Rel.15, for a given layer k, the generation of the precoding vector per subband (SB-wise) is based on the following equation.

[0117] W k (N t × N3)=W1W 2,k (Y1)

[0118] N t is the number of ports. N3 is the total number (number of subbands) of precoding matrices (precoders) represented by PMI. t ×2L) is a matrix (SD beam matrix) composed of L∈{2,4} (oversampled) spatial domain (SD) two-dimensional (2D) DFT vectors (SD beams, 2D-DFT vectors). L is the number of beams. For example, L=2 SD 2D-DFT vectors are b i,b j .W 2,k (2L×N3) is the matrix of complex linear combination (LC) coefficients (combination coefficients) for the sub-band of layer k. 2,k represents the beam selection and the phase matching (co-phasing) between the two polarizations. 2,k c i ,c j For example, the channel matrix h is obtained by linearly combining L = 2 SD 2D-DFT vectors c i b i ,+c j b j Approximation. The feedback overhead is mainly composed of the LC coefficient matrix W 2,k In addition, the type 2 CSI of Rel.15 only supports ranks 1 and 2.

[0119] Rel.16 Type 2 CSI uses frequency domain (FD) compression to reduce the W 2,k The associated overhead. In addition to supporting ranks 1 and 2, the type 2 CSI of Rel.16 also supports ranks 3 and 4.

[0120] Regarding the type 2 CSI of Rel.16, for a given layer k, the UE may also report information based on the following formula.

[0121] W k =W1W ～ k W f,k H (Y2)

[0122] W 2,k By W ～ k W f,k H Approximation. Matrix W ～ It can also be represented by adding ~ (wavy line) to W. Matrix W f,k H W f,k The adjoint matrix of .

[0123] For CSI reporting, the UE can also be configured with one subband size within the two subband sizes. This subband (CQI subband) can also be defined as N PRB SBThe number of PMI subbands per CQI subband, R, is set by the RRC IE (numberOfPMI-SubbandsPerCQI-Subband). R controls the total number of precoding matrices N3 represented by the PMI and is a function of the number of subbands set in csi-ReportingBand, the subband size set by subbandSize, and the total number of PRBs in the BWP.

[0124] W1(N t ×2L) is a matrix composed of multiple (oversampled) spatial domain (SD) 2D-DFT (vectors, beams). For this matrix, multiple indices of the two-dimensional discrete Fourier transform (2D-DFT) vector and the two-dimensional oversampling factor are reported. The spatial domain response / distribution represented by the SD2D-DFT vector can also be called an SD beam.

[0125] W ～ k (2L×M v ) is a matrix of combination coefficients (combination coefficients, subband complex linear combination (LC) coefficients). For this matrix, at most K0 non-zero coefficients (NZCs) are reported. The report consists of two parts: a bitmap that captures the NZC positions and a quantized NZC.

[0126] W f,k (N3×M v ) is a matrix composed of multiple frequency domain (FD) bases (vectors) for layer k. There are M for each layer. v FD basis (FDDFT basis). In the case of N3>19, select M from the intermediate subset (InS) of size N3' (<N3) v DFT. In the case of N3≤19, log2(C(N3-1,M v -1)) bits. Here, C(N3-1,M v -1) is to select M from N3-1 vThe number of combinations of -1 is also called binomial coefficients. The frequency domain response / distribution (frequency response) represented by the linear combination of the FD basis vectors and the combination coefficients can also be called an FD beam. The FD beam can also correspond to a delay profile (time response).

[0127] The subset of the FD basis is given by {f1,...,f Mv Here, f i is the i-th FD basis for the k-th layer, i∈{1,...,M v}. The PMI subband size is given by the CQI subband size / R, R∈{1,2}. The number of FD bases M for a given rank v v By ceil(p v ×N3 / R). The number of FD bases is the same for all layers k∈{1,2,3,4}. v Through high-level settings.

[0128] Matrix W 2,k Each row of represents the channel frequency response of a specific SD beam. In the case where the SD beam has high directivity, the channel tap of each beam is limited (the power delay profile becomes sparse in the time domain). As a result, the channel frequency response of each SD beam has a high correlation (close to flat in the frequency domain). In this case, the channel frequency response can be approximated by a linear combination of a small number of FD bases. For example, in M v = 2, use the FD basis f2, f q and the linear combination coefficient d1 0 ,d2 0 , the frequency response associated with SD beam b0 is transmitted through d1 0 f2+,d2 0 f q To approximate.

[0129] Select M v FD basis to obtain the highest gain. By setting M v <<N3,W ～ k The cost is W 2,k The overhead is much smaller. vAll or part of the FD basis is used for the approximation of the frequency response of each SD beam. A bitmap is used to report only the selected FD basis for each SD beam. If the bitmap is not reported, all FD basis are selected for each SD beam. In this case, the nonzero coefficients (NZC) of all FD basis are reported for each SD beam. The maximum number of NZCs in one layer is K. k NZ ≤K0=ceil(β×2LM v ), the maximum number of NZCs across all layers K NZ ≤2K0=ceil(β×2LM v ). β is set by high level.

[0130] W ～ k The reported complex coefficients in are the quantized amplitude and phase respectively.

[0131] [Amplitude Quantization]

[0132] The polarization specific reference amplitude is used Figure 1 Table (amplitude coefficient indicator i 2,3,l Mapping of multiple elements: From element k l,p (1) To the amplitude coefficient p l,p (1) All other coefficients are quantized using Figure 2 Table (amplitude coefficient indicator i 2,4,l Mapping of multiple elements: From element k l,i,f (2) To the amplitude coefficient p l,i,f (2) 8-level quantization of the mapping).

[0133] [Phase Quantization]

[0134] All coefficients are quantized using 16-PSK. For example, c l,i ∈{0,...,15}. Here, c l,i For the phase value to be associated Phase coefficient reported by the UE (using 4 bits).

[0135] Type 2 CSI feedback on PUSCH in Rel.16 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), which is unknown to the base station). The UE reports the number of NZCs in CSI Part 1, which determines the size of CSI Part 2. After receiving CSI Part 1, the base station identifies the size of CSI Part 2.

[0136] In enhanced type 2 CSI feedback, CSI part 1 contains RI, CQI and an indication of the total number of non-zero amplitudes across multiple layers for enhanced type 2 CSI. The fields of part 1 are coded separately. CSI part 2 contains the PMI for enhanced type 2 CSI. Parts 1 and 2 are coded separately. CSI part 2 (PMI) contains the oversampling factor, the index of the 2D-DFT basis, the index of the initial DFT basis (start offset) of the selected DFT window, and the PMI of the selected DFT window. initial , a DFT basis selected for each layer, non-zero LC coefficients (NZC, amplitude and phase) of each layer, the strongest (strongest, maximum intensity) coefficient indicator (strongest coefficientint indicator (SCI)) of each layer and at least one of the amplitude of the strongest coefficient for each layer / each polarization.

[0137] For the kth layer, multiple PMI indices (PMI values, codebook indices) associated with different CSI part 2 information may also follow as follows.

[0138] ·i 1,1 : Oversampling factor

[0139] ·i 1,2 : Multiple indices of a 2D-DFT basis

[0140] ·i 1,5 : Index of the initial DFT basis (starting offset) of the selected DFT window M initial

[0141] ·i 1,6,k : The DFT basis selected for the kth layer

[0142] ·i 1,7,k : Bitmap for layer k

[0143] ·i 1,8,k : The strongest coefficient indicator (SCI) for the kth layer

[0144] ·i 2,3,k: The amplitude of the strongest coefficient (for both polarizations) of the kth layer

[0145] ·i 2,4,k : The amplitude of the reported coefficients at the kth level

[0146] ·i 2,5,k : The phase of the reported coefficients of the kth layer

[0147] i 1,5 and 1,6,k PMI index for DFT basis reporting. Reported only when N3>19 1,5 .

[0148] As a grouping of CSI part 2, for a given CSI report, the PMI information is summarized into 3 groups (from group 0 to 2). This is important in the case of CSI omission. Index i 2,4,l 、i 2,5,l 、i 1,7,l Each element reported is associated with a specific priority rule. Groups 0 to 2 follow the following.

[0149] Group 0: index i 1,1 、i 1,2 、i 1,8,l (l=1,...,v)

[0150] Group 1: Index i (when reported) 1,5 , index i (when reported) 1,6,l 、i 1,7,l The highest (highest) v2LM v -floor(K NZ / 2) priority elements, i 2,3,l 、i 2,4,l The highest ceil (K NZ / 2)-v priority elements, i 2,5,l The highest ceil (K NZ / 2)-v priority elements (l=1,...,v)

[0151] ·Group 2:i 1,7,l The lowest floor (K NZ / 2) priority elements, i 2,4,l The lowest floor (K NZ / 2) priority elements, i 2,5,l The lowest floor (K NZ / 2) priority elements (l=1,...,v)

[0152] In type 1 CSI, an SD beam represented by an SD DFT vector is transmitted to the UE. In type 2 CSI, L SD beams are linearly combined and transmitted to the UE. Each SD beam can be associated with multiple FD beams. For the corresponding SD beam, a channel frequency response can be obtained by linearly combining these FD basis vectors. The channel frequency response corresponds to the power delay profile.

[0153] (Type 2 port selection codebook)

[0154] In Rel.16 type 2 port selection (PS) CSI, the type 2 PS codebook (CB) does not require the UE to consider the 2D-DFT in the usual type 2 CB to derive the SD beam. Instead, the base station considers a set of SD beams and uses the K beamformed CSI-RS ports to send CSI-RS. The UE identifies the best L (≤ K) CSI-RS ports and reports their indices in W1.

[0155] For layer k∈{1,2,3,4}, the subband (SB)-wise precoder generation is given by the following equation.

[0156] W k (N t ×N3)=QW1W ～k W f,k H (Y3)

[0157] Here, Q(N t ×K) represents K SD beams used for CSI-RS beamforming. W1(K×2L) is a block diagonal matrix. ～ k (2L×M) is the LC coefficient matrix. W f,k (N3×M) is composed of N3 DFT basis vectors (FD basis vectors). K is set by a higher layer. L is set by a higher layer. P CSI-RS ∈{4,8,12,16,24,32}. CSI-RS >4, L∈{2,3,4}.

[0158] In the CSI / codebook of type 2 port selection in Rel.15 / 16, each CSI-RS port #i is associated with the SD beam (b i ) to associate ( Figure 3A as well as Figure 3B ).

[0159] (Rel.17 Type 2 Port Selection Codebook)

[0160] In the CSI / codebook of type 2 port selection (enhanced type 2 port selection codebook) of Rel. 17, for each CSI-RS port #i, an SD beam is replaced with an SD-FD beam pair (SD beam b i and FD beam f i,j (j is the frequency index)) to associate ( Figure 4A as well as Figure 4B ). In this example, ports 3 and 4 are associated with the same SD beam and with different FD beams.

[0161] The frequency selectivity of the channel frequency response observed in the UE based on the SD beam-FD beam can be reduced by pre-compensation of delay (delay pre-compensation) compared to the frequency selectivity of the channel frequency response observed in the UE based on the SD beam.

[0162] The main scenario for the type 2 port selection codebook of Rel.17 is FDD. Channel reciprocity based on SRS measurements is not complete, but the base station can obtain some partial information. In addition to CSI reports, SRS measurements in the base station are also used, so that the base station can obtain CSI for the decision of the DL MIMO precoder. In this case, in order to reduce CSI overhead, some CSI reports can also be omitted.

[0163] In the type 2 PS CSI of Rel. 17, each CSI-RS port is beamformed using an SD beam and an FD basis vector. Each port is associated with an SD-FD pair.

[0164] For a given layer k, it can also be reported by the UE based on the information of the following formula.

[0165] W k (K×N3)=W1W ～ k W f,k H (Y4)

[0166] For W1(K×2L), each matrix block consists of L columns of a K×K identity matrix. The base station sends K beamformed CSI-RS ports. Each port is associated with an SD-FD pair. The UE selects L ports out of K and uses them as the PMI (W 1,k ) is reported to the base station. In Rel.16, each port is associated with an SD beam.

[0167] W ～ k (2L×M v ) is a matrix consisting of combined coefficients (subband complex LC coefficients). At most 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.

[0168] W f,k (N3×M v ) is a matrix consisting of N3 FD basis (FD DFT basis) vectors. There are M v The base station can also eliminate W f,k In W f,k When enabled (on), report M v An additional FD basis. f,k When disabled (off), additional FD bases will not be reported. In Rel.16, W is always reported f,k .

[0169] (CJT)

[0170] Joint transmission (JT) may also mean simultaneous data transmission from multiple points (eg, TRP) to a single UE.

[0171] Rel.17 supports NCJT from two TRPs. PDSCHs from two TRPs can also be precoded and decoded independently. Frequency resources can be non-overlapping, partially overlapping, or fully overlapping. In the event of overlap, the PDSCH from one TRP becomes interference to the PDSCH from other TRPs.

[0172] In Rel.18, support for CJT using up to 4 TRPs is being studied. Data from the 4 TRPs can also be coherently precoded and sent to the UE on the same time-frequency resources. For example, channels from 4 TRPs can also be considered, using the same precoding matrix. Coherence can also mean that there is a certain relationship between the phases of multiple received signals. It is also possible to use 4 TRPs joint precoding to improve signal quality, and there can be no interference between the 4 TRPs. The data can also be subject to interference only outside the 4 TRPs.

[0173] In an ideal situation (where 4 TRPs are co-located (considered to be at the same location)), a 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 pathloss of the 4 paths is sometimes significantly different. The joint precoding matrix V based on the constant module codebook is not accurate. In this case, the feedback of each TRP and the coefficients between TRPs can be matched by the current NR type 2 codebook.

[0174] For CJT of up to 4 TRPs in FR1, the selection of the 4 TRPs can also be semi-static. Therefore, the selection and the setting of the 4 CMRs (4 CSI-RS resources) for channel measurement can also be semi-static. Dynamic indication of the 4 TRPs from the list of CSI-RS resources is also possible, but less likely.

[0175] The path losses from the 4 TRPs to the UE are different. Therefore, it is difficult to report only one aggregated CSI representing the joint channel matrix.

[0176] Considering the fallback operation to NCJT (ie, single TRP), also consider the CSI of each TRP (ie, single TRP CSI like NCJT CSI of Rel.17).

[0177] (Rel.17NCJT CSI)

[0178] For Rel.17NCJT CSI, accompanied by K s =K1+K2 CMRs are set for the UE. K1 and K2 are the number of CMRs in the two CMR groups. N CMR pairs are set by the higher layer by selecting from all possible pairs. Support N=1, K s =2. N max =2 is an optional function of UE. S,max = The support of X is an optional function of UE.

[0179] At least one of the following options 1 and 2 is supported.

[0180] [Option 1]

[0181] The UE may also 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. In the case of X = 2, the two CSIs are associated with two different single TRP measurement hypotheses with multiple CMRs from different multiple CMR groups. Support of X = 1, 2 is an optional feature of the UE for UEs supporting option 1.

[0182] [Option 2]

[0183] The UE may also be configured to report a CSI associated with the best of the NCJT and single TRP measurement conditions.

[0184] As CSI enhancements for CJT, the following are being studied.

[0185] CMR and IMR for measurement of up to 4 TRPs.

[0186] ·CSI of each TRP along with inter-TRP CSI feedback for x-TRP CJT.

[0187] Inter-TRP CSI: New feedback and codebook for inter-TRP phase matrix / inter-TRP amplitude matrix / inter-TRP matrix (including both amplitude and phase).

[0188] ·Added reportable x-TRP CJT CQI.

[0189] As a multi-TRP CJT CSI, the following are being studied.

[0190] ·Restrictions on the settings of CMR / CSI for each TRP.

[0191] ·CSI / PMI between TRPs (e.g., inter-TRP phase with / without inter-TRP amplitude).

[0192] [Option 1] Independent codebook and feedback in addition to Rel.16 / 17 Type 2 codebook.

[0193] [Option 2] With W k ～ W f,k H / In W k ～ W f,k H W2 of CSI / PMI between TRPs transmitted within. Common / different FD substrates for multiple TRPs.

[0194] As a multi-panel type 2CSI for multi-TRP CJT, the following is being studied.

[0195] · Enhancement of Rel.16 / 17 type 2 codebook and type 2 PS codebook to multiple panels.

[0196] • New antenna settings for type 2 multi-panel codebook.

[0197] (CJT CSI)

[0198] W1(SD base) / W for each TRP f (FD base) can be the same or different. k (NZC) can also be different. W1 / W for each TRP f / W k You can select them together or individually. f / W k The design is preferably different scenarios with different options. It can be reported as a separate item or in W k The guidelines used depend on the configuration scenario (e.g., intra-site multiple TRPs or inter-site multiple TRPs).

[0199] For example, the precoding matrix for 4-TRP CJT CSI (codebook) can also be obtained by W1 / W for each TRP. f / W k The W1 for each TRP can be the same or different, and can be selected together or individually. k They can also be different, and can be selected together or individually. f They can be the same or different, and can be selected together or individually.

[0200] The type 2 codebook used for CJT multi-TRP (mTRP) can be at least one of the following codebook structures, or a structure that combines several of the following codebook structures.

[0201] [Codebook structure 1A]

[0202] SD / FD basis selection for each TRP / each TRP group (port group or resource) + relative phase relationship (co-phasing) / amplitude relationship (co-amplitude) (including broadband and at least one of sub-band).

[0203] For example, the codebook structure is given by the following formula.

[0204]

[0205] Here, N is the number of TRPs or TRP groups. r is the amplitude relationship (co-amplitude). r is the phase relationship (co-phase). The codebook includes α r =p r = 1 (no co-scaling) or α r =0 special case.

[0206] [Codebook structure 1B]

[0207] Joint SD / FD basis selection for each TRP / each TRP group (port group or resource) + relative phase relationship / amplitude relationship (including broadband and at least one of sub-band).

[0208] For example, the codebook structure is given by the following formula.

[0209]

[0210] Here, N is the number of TRPs or TRP groups. r is the amplitude relationship (co-amplitude). r is the phase relationship (co-phase). The codebook includes α r =p r = 1 (no co-scaling) or α r =0 special case.

[0211] [Codebook structure 2]

[0212] SD base selection per TRP / per TRP group (port group or resource), and joint FD base selection (across N TRPs).

[0213] For example, the codebook structure is given by the following formula.

[0214]

[0215] Here, N is the number of TRPs or TRP groups.

[0216] (Question #1)

[0217] In M v In the decision on (FD basis), the following two options are being studied.

[0218] [FD Base 1] Use common M across multiple TRPs v (Public M v FD substrate). Figure 5 In the example, 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 In the following figure, the horizontal axis represents the FD basis, the vertical axis represents the SD beam, and the colored elements represent non-zero coefficients.

[0219] [FD substrate 2] For each TRP, use M with different sizes / positions v (Single M v FD substrate). Figure 6 In the example, different M values ​​are used for the CSI of the first TRP, the CSI of the second TRP, the CSI of the third TRP, and the CSI of the fourth TRP. v FD base (M v,1 、M v,2 、M v,3 、M v,4 FD substrate).

[0220] However, regarding FD substrate / M v The details of the decision are unclear.

[0221] (Question #2)

[0222] In order to control the maximum number of non-zero coefficients for each layer and all layers, the following two options are being studied for β set by RRC (parameter in paramCombination set by RRC).

[0223] [Non-zero coefficient parameter 1] β for all TRPs.

[0224] [Non-zero coefficient parameter 2] β is different for each TRP.

[0225] K0 is the maximum number of non-zero coefficients for each layer. 2K0 is the maximum number of non-zero coefficients for all layers. Here, K0 = ceil(β2LM1), or K0 = ceil(β2K1M). 2L is the number of SD beams in the Rel.16 enhanced type 2 codebook. K1 is the number of ports selected in the Rel.17 port selection codebook.

[0226] The maximum number of non-zero coefficients controls the upper limit of the PMI size that the UE can report. A larger K0 has better DL performance but has a larger UCI overhead.

[0227] Furthermore, the introduction of the following restriction settings is under consideration.

[0228] The maximum number of non-zero coefficients corresponding to each layer in all X TRPs in one CSI-ReportConfig.

[0229] The maximum number of non-zero coefficients corresponding to all layers in all X TRPs in one CSI-ReportConfig.

[0230] In the bitmap reported to represent non-zero coefficients, a bitmap for each TRP is being studied.

[0231] However, the details on the restrictions / reporting of non-zero coefficients are not clear.

[0232] (Question #3)

[0233] The following options are being considered for determining and reporting the strongest coefficient indicator (SCI).

[0234] [SCI1] One SCI per TRP. Can also report additional amplitude / phase differences between the strongest reference coefficient from the 2nd / 3rd / 4th TRP and the strongest reference coefficient from the 1st TRP.

[0235] [SCI2] One SCI per layer from the entire TRP.

[0236] [SCI3] Per TRP per layer per M v An SCI. An additional amplitude / phase difference between the strongest reference coefficient from the 2nd / 3rd / 4th TRP and the strongest reference coefficient from the 1st TRP may also be reported.

[0237] [SCI4] By each layer from all TRPs, across all M v A SCI.

[0238] For the strongest coefficient, its index is preferably reported.

[0239] In the quantization of coefficients, the strongest polarization of SCI may be quantized to amplitude = 1 and phase = 0 and not reported, and the other polarizations of SCI may be quantized to 16 levels based on the strongest polarization. For other coefficients (not SCI), the amplitude may be quantized to 8 levels and the phase may be quantized to 16 levels.

[0240] However, the details of the SCI's decision / report are unclear.

[0241] Thus, the research on the setting / determination / reporting related to CJT CSI is not sufficient. If these researches are insufficient, there is a concern that the communication throughput / communication quality may be reduced.

[0242] Therefore, the inventors of the present invention have conceived a method for setting / determining / reporting related to CJT CSI.

[0243] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, each of the following embodiments (for example, each case) may be used alone or in combination of at least two.

[0244] In the present disclosure, "A / B" and "at least one of A and B" may be replaced with each other. In addition, in the present disclosure, "A / B / C" may also mean "at least one of A, B, and C".

[0245] In the present disclosure, activate, deactivate, indicate (or specify (indicate)), select, configure, update, determine, etc. may also be mutually rewritten. In the present disclosure, support, control, controllable, operate, and can operate, etc. may also be mutually rewritten.

[0246] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, high-layer parameters, information elements (IE), settings, etc. can also be overwritten with each other. In the present disclosure, Medium Access Control (MAC) control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc. can also be overwritten with each other.

[0247] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0248] In the present disclosure, MAC signaling may also use, for example, MAC Control Element (MACCE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0249] In the present disclosure, the physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI)), etc.

[0250] In the present disclosure, index, identifier (ID), indicator, resource ID, etc. may also be mutually overwritten. In the present disclosure, sequence, list, set, group, cluster, subset, etc. may also be mutually overwritten.

[0251] In the present disclosure, panel, panel group, beam, beam group, precoder, uplink (UL) transmission entity, transmission / reception point (TRP), base station, spatial relation information (SRI), spatial relation, 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 relation group, code division multiplexing (CDM)) group, reference signal group, CORESET group, physical uplink control ... Channel (PUCCH)) group, PUCCH resource group), resources (for example, reference signal resources, SRS resources), resource sets (for example, reference signal resource sets), CORESET pool, downlink transmission configuration indication state (Transmission Configuration Indication state (TCI state)) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state (unified TCI state), common TCI state (common TCI state), Quasi-Co-Location (Quasi-Co-Location (QCL)), QCL assumptions, etc. can also be rewritten with each other.

[0252] In the present disclosure, the panel, base station (gNB) panel, and TRP can also be rewritten mutually.

[0253] In the present disclosure, network (NW), base station, gNB, and TRP can also be rewritten mutually.

[0254] In the present disclosure, time domain resource allocation and time domain resource assignment may also be overwritten with each other.

[0255] In the present disclosure, beam, SD beam, SD vector, and SD 2D-DFT vector may be replaced with each other. L, 2L, the number of SD beams, the number of beams, and the number of SD 2D-DFT vectors may be replaced with each other.

[0256] In the present disclosure, FD substrate, FD DFT substrate, DFT substrate, f i In the present disclosure, FD beam, FD vector, FD basis vector, FD DFT basis vector, and DFT basis vector may be replaced with each other.

[0257] In the present disclosure, the combining coefficients, LC coefficients, sub-band complex LC coefficients, and the combining coefficient matrix may be rewritten mutually.

[0258] In the present disclosure, phase relationship (co-phasing), phase matching, phase compensation, phase adjustment, phase difference, and phase relationship may also be replaced by each other. In the present disclosure, amplitude relationship (co-amplitude), amplitude compensation, amplitude adjustment, amplitude ratio, and amplitude relationship may also be replaced by each other. In the present disclosure, difference, ratio, and relative value may also be replaced by each other.

[0259] In the present disclosure, layer k and layer l may also be replaced with each other.

[0260] In the present disclosure, size and length can also be replaced with each other.

[0261] (Wireless Communication Method)

[0262] In each embodiment, X TRPs, X-TRPs, X panels, and Ng panels may be replaced with each other. In each embodiment, CJTs using X TRPs, CJTs using X panels, and X-TRP CJTs may be replaced with each other.

[0263] In each embodiment, the reference CSI, the CSI for the reference TRP, and the first reported CSI may also override each other. 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 also override each other. In each embodiment, the TRP, CSI-RS resource, CMR, CMR group, and CSI-RS resource set may also override each other.

[0264] In each embodiment, multiple TRPs, multiple panels, intra-site multiple TRPs, and inter-site multiple TRPs can also rewrite each other.

[0265] In each embodiment, inter-TRP, inter-panel, inter-TRP difference, and inter-TRP comparison can also be rewritten.

[0266] In various embodiments, inter-TRP CSI, inter-TRP CJT CSI, inter-panel CSI, CSI of other TRPs relative to the CSI of the reference TRP, and CSI of other TRPs relative to the CSI of the reference panel may also overwrite each other. In various embodiments, per-TRP CSI and per-panel CSI may also overwrite each other.

[0267] In various embodiments, the inter-TRP phase index and the inter-TRP phase matching (phasing) index may also be overwritten with each other. In various embodiments, the inter-TRP index and the inter-TRP coefficient (coefficient) index may also be overwritten with each other. In various embodiments, the inter-TRP phase (phase) matrix and the inter-TRP phase matching (phasing) matrix may also be overwritten with each other. In various embodiments, the inter-TRP matrix and the inter-TRP coefficient (coefficient) matrix may also be overwritten with each other. In various embodiments, the inter-TRP phase (phase) codebook and the inter-TRP phase matching (phasing) codebook may also be overwritten with each other. In various embodiments, the inter-TRP codebook and the inter-TRP coefficient (coefficient) codebook may also be overwritten with each other.

[0268] In each embodiment, the object resource, CMR, CSI-RS resource, NZP-CSI-RS resource, CMR group, CSI-RS resource set, NZP-CSI-RS resource set, and TRP may also be overwritten with each other.

[0269] In each embodiment, the TRP codebook, multiple panel codebooks used for the type 2 codebook, and the panel codebook can also be rewritten with each other.

[0270] In various embodiments, the FD basis vector size, the FD basis number, M v Size, M v 、M v,i They can also rewrite each other.

[0271] In various embodiments, multiple TRPs / multiple CMRs may be co-located (collocate) and multiple TRPs within a site may also overwrite each other.

[0272] In various embodiments, the report / content of CSI may be applied to both subband report and wideband report.

[0273] <Implementation method #1>

[0274] This implementation addresses problem #1.

[0275] The UE may also determine, for multiple TRPs used for CJT, multiple FD bases that are common to the multiple TRPs or that are separate for each TRP. The UE may also send a CSI / codebook report based on the multiple FD bases.

[0276] 《FD Base 1》

[0277] It is also possible to use a common M across multiple TRPs. v The FD substrate 1 may also follow at least one of the following options.

[0278] [FD substrate 1-1]

[0279] M set by NW v (Number / size of FD bases selected) can also be common across multiple TRPs v .

[0280] [FD substrate 1-2]

[0281] In addition to M v In addition to the value, NW can also set a window of size N. The UE can also select M from a window of size N. v FD basis, and report M v The FD substrate 1-2 may also follow at least one of the following options.

[0282] [[FD substrate 1-2A]]

[0283] M v FD bases are given by successive FD bases from N FD bases. Figure 7 In the example, 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 is used. v A continuous FD substrate.

[0284] [[FD base 1-2B]]

[0285] M v FD bases are given by discontinuous FD bases from N FD bases. Figure 8 In the example, 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 is used. vdiscontinuous FD bases. In this case, for the i-th TRP, the size is N (the size is N×2L i ) bitmap can also be used for M v The bitmap may also contain an indication of the FD basis. v Alternatively, multiple sets of starting positions and lengths can be used for M v Indication of an FD basis.

[0286] When N=M v In the case of v location.

[0287] [FD substrate 1-3]

[0288] NW can also set the window size to N, and M v The maximum value (M v_max ). The UE may also report a size M below N. v , and M v The position of the FD substrate.

[0289] The FD substrate 1-2 / 1-3 may be used when a certain condition / restriction is satisfied. For example, the condition may be at least one of the following conditions.

[0290] ·M v Greater than or less than a value.

[0291] The enhanced type 2 port selection codebook is set.

[0292] The number of set CMR / TRP is greater than or less than a certain value.

[0293] As in Rel.17 type 2 port selection codebook, N provides the UE with the flexibility to select the beam for SD / FD taking into account the mutual relationship (reciprocity) of the parts in FDD. N can also be used when a port selection codebook is set. The window can also be given by size and length. The delay of the starting position can also be implicitly controlled by NW. NW can control any delay at the beginning of the window. It can also be imagined that M_init for the window is fixed to 0. In this case, the starting position of the window may not be indicated.

[0294] In the Rel.17 type 2 port selection codebook, M v is a parameter in paramCombination-r17. By enhancing the codebook based on Rel.17 type 2 port selection, M v It can also be a parameter in paramCombination-r18. In Rel.16 type 2 codebook, Mv By ceil(p v ·N3 / R) calculation. Here, p v is a parameter in paramCombination-r16. Therefore, in the enhancement based on Rel.16 type 2 codebook, M v You can also use ceil(p v ·N3 / R) and is combined with the p set in paramCombination-r16 v association.

[0295] The window representing the N FD bases may also follow at least one of the following windows.

[0296] [Window 1]

[0297] This window (size N / starting position) may also be common to all TRPs / CMRs. This window may also follow at least one of the following windows 1-1 to 1-2.

[0298] [[Window 1-1]] RRC IE may also be set to size N. The starting position may also be assumed to be 0.

[0299] [[Window 1-2]]RRC IE can also set the size N and the starting position.

[0300] [Window 2]

[0301] This window (size N / starting position) may also be set individually for each TRP / CMR. This window may also follow at least one of the following windows 2-1 to 2-3.

[0302] [[Window 2-1]] The window (N i+1 FD basis) is the window (N i A subset of a FD basis). Fig. 9 In the example, the 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).

[0303] [[Window 2-2]] The window (N i+1 FD basis) and the window (N i FD bases) overlap. Fig.10 In the example, the 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 (including 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 (including at least a portion of the window for the CSI of the second TRP).

[0304] [[Window 2-3]] is the window (N i+1 FD basis), and the window set for the i-th TRP (N i There is no restriction between the FD substrates).

[0305] [Window 3]

[0306] This window (size N / starting position) can also be set separately for each group of TRP / CMR. This window can also follow at least one of the aforementioned windows 2-1 to 2-3.

[0307] 《FD Base 2》

[0308] For each TRP, multiple FD bases of different sizes M can also be used. v / position. The FD substrate 2 may also follow at least one of the following options.

[0309] [FD substrate 2-1]

[0310] For M for multiple TRPs v , NW can also set the window (N FD basis). v In the case of the maximum number of, for the size M of the i-th TRP v,i It can also be set through RRC and reported through UE.

[0311] [FD substrate 2-2]

[0312] The window (N FD bases) can also be combined with the FD base for the first TRP (M v,1 The M for the first TRP may not be required. v The size M for other TRPs can also be reported v / location. Fig.11 In the example, the N FD-based windows are the same as the M for the first TRP. v,1 The FD base is the same.v,2 FD base, and M for the third TRP v,3 A FD basis can also be within this window. M can also be reported v,2 FD basis and M v,3 The size / position of the FD basis.

[0313] [FD substrate 2-3]

[0314] M for each TRP v The FD substrate may be a continuous FD substrate (same as the FD substrate 1-2A) or a discontinuous FD substrate (same as the FD substrate 1-2B). Fig.12 In the example, the N FD-based windows are the same as the M for the first TRP. v,1 The FD bases are the same. v,1 The FD bases are continuous, and the M of the second TRP v,2 The FD bases are discontinuous. For the M of the third TRP v,3 The FD base is discontinuous.

[0315] [FD substrate 2-4]

[0316] There may also be limitations on the application of the FD substrate 2. For example, the limitation may be at least one of the following limitations.

[0317] ·M v Greater than or less than a value.

[0318] ·The port selection codebook is set.

[0319] The number of set CMR / TRP is greater than or less than a certain value.

[0320] M is set for each TRP v The maximum value M v,i,max is the descending or ascending order of TRP index i (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 ).

[0321] · M reported per TRP v The value of M v,i is the descending or ascending order of TRP index i (M v,1 ≥M v,2 ≥M v,3 ≥M v,4 or Mv,4 ≥M v,3 ≥M v,2 ≥M v,1 ).

[0322] In addition to the M reported per TRP v The value of M v,i is the descending order of TRP index i (M v,1 ≥M v,2 ≥M v,3 ≥M v,41 ), the actual M for the i+1th TRP v,i+1 The FD basis is the M for the i-th TRP v,i A subset of a FD basis.

[0323] exist Fig.13 In the example, the FD basis number for the first TRP, the second TRP, and the third TRP is M. v,1 、M v,2 、M v,3 , M v,1 ≥M v,2 ≥M v,3 . M for the 2nd TRP v,2 The first FD basis is for the M of the first TRP v,1 A subset of the FD basis, for the M of the third TRP v,3 The first FD basis is for the M of the second TRP v,2 A subset of a FD basis.

[0324] 《FD Base 3》

[0325] For multiple CMR / TRPs indicated in one group of CMR / TRPs, FD substrate 1 can also be applied to have a common M in one group. v For multiple CMR / TRPs across multiple groups (not in the same group), the FD substrate 2 can also be applied. That is, FD substrates of different sizes / positions can also be applied between multiple groups.

[0326] The parameters set / reported in the FD base 1 / 2 can be provided for each group of CMR / TRP or for multiple groups across CMR / TRP. v The settings / reports can also be set for each CMR group, M v The position of each FD base can also be reported for each CMR group. The FD base 1 / 2 limit can be applied within a CMR group or to multiple CMR groups.

[0327] exist Fig.14In the example, 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 in the first CMR group, a common M v 1 = 4 FD bases. For the two TRPs in the second CMR group, use the common M v 2 = 2 FD bases. M v 2 The positions of the N FD bases can be reported either as positions within the N FD bases or as positions for M v 1 The relative positions of the FD substrates.

[0328] exist Fig.15 In the example, 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 may not be associated with a group index. In the first CMR group, N = M for two TRPs v 1 = 4 FD bases are common. In the second CMR group, use M v 2 = 2 FD bases. In the third CMR group, use M v 3 = 2 FD bases. M v 2 FD base, M v 3 The positions of the N FD bases can be reported either as positions within the N FD bases or as positions for M v 1 The relative positions of the FD substrates.

[0329] For multiple CMR / TRPs indicated in one group, the same SD beam may be implicitly indicated / assumed for multiple CMR / TRPs in one group. The RRC IE may also set whether the same SD beam is assumed for measurement / reporting for multiple CMR / TRPs in one group.

[0330] exist Fig.16 In the example, 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. In the first CMR group, the same 2L is used for the first TRP and the second TRP.1 In the second CMR group, the same 2L beam was used for the third and fourth TRPs. 2 SD beams.

[0331] exist Fig.17 In the example, 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. In the first CMR group, for the first TRP, use 2L 1 In the second CMR group, the same 2L beam was used for the second TRP, the third TRP, and the fourth TRP. 2 SD beams.

[0332] The use of FD basis 1 / 2 / 3 may be specified in the specification or set through RRC IE. The signaling may also be per CMR / per CMR group / per CSI-ReportConfig.

[0333] According to this embodiment, the UE is able to appropriately decide / report the FD basis for CJT CSI.

[0334] <Implementation method #2>

[0335] This embodiment relates to the non-zero coefficient parameters of Problem #2.

[0336] The UE may also receive one or more parameters (non-zero coefficient parameters, such as β) for multiple TRPs used for CJT. The UE may also determine the maximum number of non-zero coefficients for the multiple TRPs based on the one or more parameters.

[0337] 《Non-zero coefficient parameter 1》

[0338] It is also possible to set β for all TRPs.

[0339] 《Non-zero coefficient parameter 2》

[0340] It is also possible to set a different β for each TRP.

[0341] At least one of the following limitations may also exist.

[0342] ·According to the β (β i ) can also follow the descending or ascending order of TRP index i (β1≥β2≥β3≥β4 or β4≥β3≥β2≥β1).

[0343] · The β set for each TRP can also confirm 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 ).

[0344] · The β set for each TRP can also confirm the maximum number of non-zero coefficients (K) for each layer of each TRP or for all layers of each TRP. 0,i )For each TRP the same (K 0,1 =K 0,2 =K 0,3 =K 0,4 ).

[0345] 《Non-zero coefficient parameter 3》

[0346] The β for one or more TRPs in a CMR group and the β for one or more TRPs in a different CMR group may be different.

[0347] At least one of the following limitations may also exist.

[0348] β set for each group of CMR / TRP may also follow the descending or ascending order of the group index.

[0349] β set for each CMR / TRP group may also confirm that the maximum number of non-zero coefficients for each layer of each group or for all layers of each group follows the descending order or ascending order of the group index.

[0350] · It can also be confirmed that the β set for each CMR / TRP group is the same for each group, for each layer of each group, or for all layers of each group.

[0351] For Y TRPs in a group, if the SD beam of each TRP is different, K0 can also be i＝1 Y K 0,i For Y TRPs in a group, if the SD beams of each TRP are the same, K0=K 0,1 =... =K 0,Y .

[0352] Furthermore, at least one of the following restrictive settings (depending on UE capabilities) may be introduced.

[0353] ·The maximum number of non-zero coefficients corresponding to each layer of the CMR / TRP group in the CSI-ReportConfig.

[0354] ·The maximum number of non-zero coefficients corresponding to all layers of the CMR / TRP group in the CSI-ReportConfig.

[0355] The use of non-zero coefficient parameters 1 / 2 / 3 may be specified in the specification or set via RRC IE. The signaling may also be per CMR / per CMR group / per CSI-ReportConfig.

[0356] The UE can verify that the reported actual number of non-zero coefficients follows the descending order for the reported CRIs. For example, in case CMR#2 is reported as the strongest point like the first reported CRI, TRP#2 may also be reported with the largest actual number of non-zero coefficients. For example, in case CMR#3 is reported as the weakest point like the last reported CRI, TRP#3 may also be reported with the smallest actual number of non-zero coefficients.

[0357] According to this embodiment, the UE is able to appropriately decide / report non-zero coefficients for CJT CSI.

[0358] <Implementation method #3>

[0359] This embodiment involves a bitmap of non-zero coefficients for problem #2.

[0360] "Bit Figure 1 》

[0361] It is also possible to report a bitmap per TRP. In Rel.16 type 2 codebook, each bitmap has a size of 2LM. In Rel.17 type 2 port selection codebook, each bitmap has a size of K1M. It is also possible to report X separate bitmaps.

[0362] "Bit Figure 2 》

[0363] It is also possible to report a bitmap (joint bitmap) for all TRPs (X TRPs). The size of the joint bitmap can be either Σ i＝1 X 2L i M i , or Σ i＝1 X K 1,i M i .

[0364] Bitmap 3

[0365] It is also possible to report a bitmap for each group of CMR / TRPs. If the SD beam is different for each TRP, the number of bits in the bitmap for Y TRPs in a group can be either Σ i＝1 Y 2L i M i , or Σ i＝1 Y K 1,i M i If the SD beams of each TRP in a group are the same, the number of bits in the bitmap for Y TRPs in a group can be either 2L i M i , or K 1,i M i .

[0366] exist Fig.18 In the example, the first CMR group is associated with the CSI of the first TRP and the CSI of the second TRP. The same N=M is ​​used in the CSI of the first TRP and the CSI of the second TRP. v 1 = 4 FD bases. In the first CMR group, different SD beams are used in the first TRP and the second TRP. For the first TRP, 2L1 SD beams are used, and for the second TRP, 2L2 SD beams are used. The number of bits in the bitmap for the first CMR group can also be 2L1M v 1 +2L2M v 1 .

[0367] exist Fig.19 In the example, the first CMR group is associated with the CSI of the first TRP and the CSI of the second TRP. In the first TRP and the second TRP, the same N=M is ​​used. v 1 = 4 FD bases. In the first CMR group, the same 2L was used in the first TRP and the second TRP. 1 SD beams. The number of bits in the bitmap for the first CMR group can also be 2L 1 M v 1 .

[0368] Use bits Figure 1 / 2 / 3 This can be specified in the specification or set through RRC IE.

[0369] According to this embodiment, the UE can appropriately decide / report the bitmap of non-zero coefficients for CJT CSI.

[0370] <Implementation method #4>

[0371] This implementation addresses issue #3.

[0372] 《SCI1》

[0373] It is also possible to report one SCI per TRP and per layer. It is also possible to report the additional amplitude / phase difference between the strongest reference coefficient from the 2nd / 3rd / 4th TRP and the strongest reference coefficient from the 1st TRP. It is also possible to report the relative values ​​of the amplitude / phase of the strongest reference coefficient from the 1st TRP and the amplitude / phase of the strongest reference coefficient from the 2nd / 3rd / 4th TRP, where the amplitude / phase of the strongest reference coefficient from the 1st TRP is used as the reference amplitude / phase.

[0374] 《SCI2》

[0375] It is also possible to report one SCI per layer from the entire TRP.

[0376] 《SCI3》

[0377] You can also use each TRPi to calculate the M interval of each layer. v,i One SCI is reported for each FD basis. An additional amplitude / phase difference between the strongest reference coefficient from the 2nd / 3rd / 4th TRP and the strongest reference coefficient from the 1st TRP can also be reported.

[0378] 《SCI4》

[0379] It is also possible to report on each layer from all TRPs across all M v,i An SCI based on an FD.

[0380] 《SCI5》

[0381] It is also possible to report one SCI per layer per group of CMR / TRP.

[0382] You can also additionally report the difference in amplitude / phase between the strongest reference coefficient from the 2nd / 3rd / ... group and the strongest reference coefficient from the 1st group.

[0383] exist Fig. 20In the example, 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 in the first CMR group, a common M v 1 For the two TRPs in the second CMR group, a common M v 2 One SCI is reported for each CMR group, and the difference in amplitude / phase of the SCI in the second CMR group relative to the amplitude / phase of the SCI in the first CMR group (the amplitude / phase using the amplitude / phase of the SCI in the first CMR group as a reference) is additionally reported.

[0384] 《SCI6》

[0385] For SCI1 / 2 / 3 / 4 / 5, it is also possible to add the SCI for each polarization.

[0386] For example, in SCI6+1, one SCI may also be reported per TRP and per layer per polarization.

[0387] exist Fig.21 In the example, for the CSI of the first TRP and the CSI of the second TRP, two polarizations are used for each TRP. For the two TRPs, a common M v One SCI is reported per TRP and per polarization.

[0388] For example, in SCI6+2, one SCI may be reported for each layer and each polarization for all TRPs.

[0389] exist Fig. 22 In the example, for the CSI of the first TRP and the CSI of the second TRP, two polarizations are used for each TRP. For the two TRPs, a common M v FD bases. For all TRPs, 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.

[0390] It is also possible to additionally report the difference in amplitude / phase between the strongest reference coefficients from the two polarizations.

[0391] Use SCI1 / 2 / 3 / 4 / 5 / 6 (SCI is per polarization / per layer / per M vThe signaling can also be per CMR / per CMR group / per CSI-ReportConfig. The setting can be different between different groups of CMR / TRPs, or between different CMR / TRPs.

[0392] For the strongest TRPs, SCI per TRP per layer per polarization is valid. For weaker TRPs, SCI per TRP or per TRP group with advanced quantization is sufficient to reduce the overhead of CSI reporting.

[0393] The other polarizations of SCI can also be quantized by 8 levels of amplitude. Whether the other polarizations of SCI are quantized by 16 levels of amplitude or 8 levels of amplitude can also be set through RRC IE. The amplitude quantization level of each SCI (for each polarization) of SCI1 / 2 / 3 / 4 / 5 / 6 can be specified in the specification or set through RRC IE. The amplitude / phase quantization level of each non-SCI (for each polarization) of SCI1 / 2 / 3 / 4 / 5 / 6 can be specified in the specification or set through RRC IE.

[0394] For weaker TRPs, the reporting overhead can be reduced by setting the phase quantization level to 8 instead of 16.

[0395] According to this embodiment, the UE is able to appropriately decide / report the SCI for CJT CSI.

[0396] <Implementation method #A1>

[0397] If it is configured to report the CSI of each TRP in one CSI report for CJT CSI, one or more of the following restrictions 1 to 3 may be considered for the CSI of each TRP.

[0398] Restriction 1

[0399] For the CSI measurement of each TRP, the same RI is assumed. It can also be set to require only common RI reports. For example, it is also possible to include RI reports in the first CJT CSI and not include RI reports in the second / third / fourth CJT CSI. If the RI reports are different for the CSI of each TRP, it is difficult for the base station to update these RIs for the CJT CSI.

[0400] Restriction 2

[0401] For each TRP, at least one of a common parameter and a differentiated parameter is set. Here, each TRP, each CMR, each CMR group, and each CMR set can also overwrite each other. The parameter can also be represented by at least one of the following parameter fields.

[0402] · Indicates the supported parameter (codebook parameter) combinations (L, p v ,β,α,M) field (paramCombination) corresponding to the value / index of the combination of at least one value.

[0403] • A field indicating how the PMI subbands are defined for each CQI subband (numberOfPMI-SubbandsPerCQI-Subband).

[0404] The number of beams L (numberOfBeams) used for linear combining.

[0405] The size of the PSK alphabet (alphabet), QPSK or 8-PSK (phaseAlphabetSize).

[0406] • A field (subbandAmplitude) that is true if subband amplitude reporting is activated.

[0407] ·The value of N (for example, when M=2, parameter N∈{2,4} is set) (valueOfN).

[0408] In Rel.15 / 16 / 17, these parameters are set per codebook configuration (CodebookConfig) and per CSI report configuration (CSI-ReportConfig). In the CJT CSI configuration, some of these parameters can also be set per TRP. In this CJT CSI configuration, the CSI of the 2nd / 3rd / 4th TRP can also have coarser feedback granularity and smaller overhead than the CSI of the 1st TRP. In paramCombination, different (L, p v For CJT CSI settings, it is also possible to set parameters for a common part of TRP (for example, common L) and a specific part of TRP (for example, p v ,β).

[0409] Fig.23A represents W for the first TRP ～ , and W for the second TRP ～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.

[0410] Fig. 23B represents W for the first TRP ～ , and W for the second TRP ～ Another example. As in this example, the same SD beam number L and different maximum numbers of NZCs for each layer of each TRP can also be set (β=1 / 2, 1 / 4).

[0411] Restriction 3

[0412] In CSI-ReportConfig, at least one of the following settings 3a to 3d is introduced for all of the X TRPs (all CMRs / IMRs).

[0413] [Setting 3a] Maximum number of non-zero coefficients (NZC) for all layers of the X TRPs in the CSI-ReportConfig.

[0414] [Setting 3b] Maximum number of NZCs for all layers of X TRPs in CSI-ReportConfig.

[0415] [Setting 3c] Maximum number of all SD beams for X TRPs in CSI-ReportConfig.

[0416] [Set 3d] Total FD basis number (FD basis vector size) M for X TRPs in CSI-ReportConfig v The maximum number of .

[0417] UE capability signaling for at least one of restrictions 1 to 3 may also be introduced.

[0418] According to this embodiment, the UE can appropriately report the CSI of each of the X TRPs within one CSI report based on the restrictions / relationships.

[0419] <Implementation method #A2>

[0420] If it is set to report the CSI of each TRP in one CSI report for CJT CSI, the order / operation of measurement may also follow at least one of the following operations 1 to 4.

[0421] Operation 1

[0422] First, (assuming single TRP reception) select the best TRP / CRI / CSI (CSI of the 1st TRP, 1st CJT CSI). Next, assume 2-TRP CJT reception, and measure the CSI of the 2nd TRP based on the 1st CJT CSI. Next, assume 3-TRP CJT reception, and measure the CSI of the 3rd TRP based on the 1st and 2nd CJT CSI. Next, assume 4-TRP CJT reception, and measure the CSI of the 4th TRP based on the 1st, 2nd and 3rd CJT CSI. In this case, the UE can also assume different receive beamforming matrices in the measurement of the 2nd, 3rd, and 4th TRP CSI.

[0423] Operation 2

[0424] First, (assuming single TRP reception) select the best TRP / CRI / CSI (CSI of the 1st TRP, 1st CJT CSI). Next, assume 2-TRP CJT reception and measure the CSI of the 2nd TRP based on the 1st CJT CSI (similarly, the CSI of the 3rd and 4th TRPs). In this case, the UE can also assume the same receive beamforming matrix in the measurement of the 2nd, 3rd, and 4th TRP CSI.

[0425] Operation 3

[0426] First, (assuming single TRP reception) select the best TRP / CRI / CSI (CSI of the 1st TRP, 1st CJT CSI). Next, assume 4-TRP CJT reception and measure the CSI of the 2nd, 3rd, and 4th TRP based on the 1st CJT CSI. In this case, the UE can also assume the same receive beamforming matrix in the measurement of the 2nd, 3rd, and 4th TRP CSI.

[0427] Operation 4

[0428] Assuming 4-TRP CJT reception, measure the CSI of the 1st, 2nd, 3rd, and 4th TRP. In this case, the UE can also assume the same receive beamforming matrix in the measurement of the 1st, 2nd, 3rd, and 4th TRP CSI.

[0429] UE capability signaling for at least one of operations 1 to 4 may also be introduced.

[0430] According to this embodiment, the UE is able to appropriately measure and report the CSI for each of the X TRPs within one CSI report.

[0431] <Implementation method #A3>

[0432] For inter-TRP CSI / PMI (e.g., inter-TRP amplitude and inter-TRP phase, or only inter-TRP phase), the UE may also follow at least one of the following reports 1 to 2.

[0433] Report 1

[0434] Alternatively, there may be an independent codebook and feedback for CSI / PMI between TRPs before (above) the existing Rel. 16 / 17 type 2 codebook. CSI / PMI between TRPs may also comply with at least one of the following reports 1A to 1B.

[0435] [Report 1A]

[0436] The size of the matrix W2 for inter-TRP CSI / PMI is 1×1. This may also mean considering the inter-TRP PMI between two TRPs. In this case, W2 may also be common to multiple layers.

[0437] [Report 1B]

[0438] The size of the matrix W2 used for CSI / PMI between TRPs is N t ×N t , or K×K for Rel.17 type 2 port selection CSI. This may also mean considering the inter-TRP PMI between antenna ports from two TRPs. In this case, W2 may also be common to multiple layers.

[0439] The 1st CJTCSI of layer 1 for the 1st TRP (best TRP) can also be expressed by the following formula.

[0440] W l,1 (N t × N3)=W1W ～ k W f,k H (a-1)

[0441] The 1st CJTCSI of layer 1 for the 1st TRP (best TRP) can also be expressed by the following formula.

[0442] W' l,i (N t × N3) = W 2,i W1W ～ k W f,k H (a-2)

[0443] W 2,i (1×1) or W2,i (N t ×N t ), where i can also be the index of the TRP / CMR / CMR group.

[0444] Similar to the principle of multi-panel codebook, the base station can also be based on W 2,i In this example, for layer l of TRP#i (i={2,3,4}), the base station can also use the following formula, using the reported W 2i To update W' li .

[0445]

[0446] Report 2

[0447] The matrix W2 used for CSI / PMI between TRPs can be combined with W ～ k W f,k H can also be transmitted in W ～ k W f,k H The CSI / PMIw2 between TRPs may also follow at least one of the following reports 2a to 2b.

[0448] [Report 2a]

[0449] For 2nd / 3rd / 4th CJT CSI measurements, the FD basis and coefficients are based on the common M from across multiple TRPs. v (The common FD basis W f,k ) of the public M set / indicated v , measured together with the first CJT CSI, the coefficient W for these TRPs ～ k It can also be selected jointly or reported in the CSI of each TRP. The coefficient report can also follow at least one of the following reports 2a-1 to 2a-2.

[0450] [[Report 2a-1]]

[0451] In the coefficient reporting of each TRP, the existing reports can also be reused. That is, a strongest coefficient indicator (SCI) can also be reported for each TRP and each layer. It can also have amplitude = 1 and phase = 0 as a reference coefficient. The other coefficients of each TRP and each layer can also be quantized based on this reference coefficient. The amplitude / phase difference between the strongest reference coefficient from the 2nd / 3rd / 4th TRP and the strongest reference coefficient from the 1st TRP can also be reported additionally.

[0452] exist Fig.24 In the example, it is also possible to report an SCI for each TRP and each layer and quantize each TRP, and additionally report the amplitude / phase difference between the reference coefficient from the first TRP and the reference coefficient from other TRPs. In this example, the amplitude / phase of the SCI beam of each TRP is not reported, but the amplitude / phase difference between the reference coefficient from the first TRP and the reference coefficient from other TRPs is reported.

[0453] [[Report 2a-2]]

[0454] Alternatively, for coefficient reporting across multiple (all) TRPs, in the first TRP CSI, a strongest coefficient indicator (SCI) is reported for each layer from all TRPs, and the other coefficients of each TRP and each layer are quantized based on the strongest coefficient. The strongest coefficient may also have amplitude = 1 and phase = 0 as a reference coefficient. The other coefficients of each TRP and each layer may also be quantized based on the reference coefficient. Therefore, in the second / third / fourth TRP CSI, there may not be an SCI report for each TRP CSI, and the amplitude / phase of the original SCI may also be quantized and fed back based on the common SCI, similar to other non-SCI beams. The original SCI of each TRP may also have amplitude = 1 and phase = 0 as a reference. Therefore, the amplitude / phase of the SCI of each TRP may not be reported in report 2a-1.

[0455] exist Fig.25 In the example, it is also possible to report an SCI for each layer across all TRPs and perform quantization across all TRPs. In this example, it is also possible that in the 2nd / 3rd / 4th TRP CSI, the original SCI is not reported, but the amplitude / phase of the original SCI beam of each TRP is reported.

[0456] [Report 2b]

[0457] For the second / third / fourth CJT CSI measurement, the FD basis and coefficients are measured together with the first CJT CSI based on the set large FD basis. For each TRP, the main coefficients can also be dispersed in different FD basis for each TRP. In this case, different M can also be reported for each TRP. v,i The coefficient report may also follow at least one of the following reports 2b-1 to 2b-2.

[0458] [[Report 2b-1]]

[0459] In the coefficient report of each TRP, the existing report can also be reused. That is, it is also possible to report each TRP, each layer, each M v,i A Strongest Coefficient Indicator (SCI) of . It can also have amplitude = 1 and phase = 0 as a reference coefficient. Each TRP, each layer, each M v,i Other coefficients can also be quantized based on this reference coefficient. The amplitude / phase difference between the strongest reference coefficient from the 2nd / 3rd / 4th TRP and the strongest reference coefficient from the 1st TRP can also be reported additionally.

[0460] You can also use each TRP, each layer, each M v,i To make an SCI report and quantify each TRP.

[0461] exist Fig.26 In the example, for TRP#i (i={1,2,3,4}), M less than the set FD basis number (FD basis vector size) can also be set. v,i The UE may also determine the starting offset of the selected FD basis. It may also use M based on the starting offset within the set FD basis. v,i FD basis, determine W f,k , W ～ k For TRP#i, you can also set the number of SD beams (SD DFT vectors) L i For each TRP, the SCI may also be selected / reported based on the selected FD basis and the set SD beam.

[0462] [[Report 2b-2]]

[0463] Alternatively, for coefficient reporting across multiple (all) TRPs, in the first TRP CSI, all M coefficients across each layer from all TRPs are reported. v,iA strongest coefficient indicator (SCI) is provided, based on which the other coefficients of each TRP and each layer are quantized. The strongest coefficient can also have amplitude = 1 and phase = 0 as a reference coefficient. The other coefficients of each TRP and each layer can also be quantized based on this reference coefficient. Therefore, in the 2nd / 3rd / 4th TRP CSI, the SCI report of each TRP CSI can also be not reported, and the amplitude / phase of the original SCI can also be quantized and fed back based on the common SCI like other non-SCI beams. In addition to the TRP-specific M v In addition to the determination and reporting, the reporting of coefficients for each TRP and the reporting of coefficients across multiple TRPs can also be the same as Report 2a-1 / 2a-2.

[0464] It is also possible to perform per TRP, per layer, across all M v,i A SCI report and a report for each TRP, each layer, across all M v,i quantification.

[0465] M for each TRP v The size may also comply with at least one of the following size determination methods 1 and 2.

[0466] [Size determination method 1]

[0467] Each TRP's (or, common to all TRPs) M v The size can also be set through RRC. For each TRP, the UE can also determine M v The starting offset of .

[0468] [Size determination method 2]

[0469] M of each TRP v The maximum size of M can be specified in the specification or set by RRC. The UE can also determine the M of each TRP based on implementation (for example, considering good coefficient dispersion). v size.

[0470] Variant

[0471] M v,i It can also be discontinuous. Therefore, it can also be that in order to notify the discontinuous M v,i , it is necessary to report the v,i The indices of the FD basis.

[0472] In Report 2, the PMI between TRPs can be compared with W ～ k W f,k H Transmit together, or you can～ k W f,k H For this inter-TRP PMI, inter-TRP CSI can also be applied.

[0473] Compared with Report 2a, Report 2b was able to use a smaller TRP-specific M v , reducing feedback overhead.

[0474] The UE may also support Report 2a (for M common to multiple TRPs) v ) and Report 2b (for TRP-specific M v Report 2a and Report 2b may also be switched based on the number of FD bases / subbands, etc.

[0475] According to this embodiment, the UE is able to appropriately report the CSI / PMI between TRPs.

[0476] <Supplement>

[0477] At least one of the above-mentioned implementation modes may also be applied only to a UE that reports a specific UE capability (UE capability) or supports the specific UE capability.

[0478] The specific UE capability may also represent at least one of the following:

[0479] Supporting specific processing / operation / control / information related to at least one of the above-mentioned embodiments.

[0480] Supports CJT CSI based on Rel.16 enhanced type 2 CSI.

[0481] Supports CJT CSI based on Rel.17 enhanced type 2 port selection CSI.

[0482] Supports M across multiple TRP / CMR v (M v FD base), or M for each TRP / CMR v (M v FD basis), or a separate M for each group of TRP / CMR v (M v FD basis). Supports continuous M v FD basis. Supports discontinuous M v FD bases. Supported FD bases of size M v / Location report.

[0483] · Setting of the window for the FD basis and the value of the size N of the window.

[0484] ·Support the same β setting for each TRP, each TRP group, or all TRPs. Support the different β setting for each TRP, each TRP group, or all TRPs. Support the setting of β value.

[0485] ·For each TRP, or each TRP group, or all TRPs, or CSI-ReportConfig, the maximum number of non-zero coefficients for each layer.

[0486] For each TRP, or each TRP group, or all TRPs, support reporting of a bitmap representing non-zero coefficients.

[0487] Supports each polarization / each layer / each TRP / each M v / per TRP group / per all TRPs, SCI. Supports the same settings for different TRPs / TRP groups. Supports different settings for different TRPs / TRP groups.

[0488] For the two polarizations of SCI, different quantization levels are supported.

[0489] Different quantization levels are supported for SCI / non-SCI from different TRPs / TRP groups.

[0490] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied across all frequencies (commonly regardless of frequency), capabilities that are applied on a per-frequency basis (for example, cell, band, BWP), capabilities that are applied on a per-frequency basis (for example, frequency range (Frequency Range) 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities that are applied on a per-subcarrier spacing (SubCarrier Spacing (SCS)).

[0491] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied across full-duplex modes (commonly regardless of the duplex mode) or capabilities that are applied to each duplex mode (for example, time division duplex (TDD) and frequency division duplex (FDD)).

[0492] In addition, at least one of the above-mentioned embodiments may also be applied when the UE is configured with specific information associated with the above-mentioned embodiments through high-layer signaling. For example, the specific information may also be information indicating activation of at least one of the above-mentioned embodiments, any RRC parameter for a specific version (e.g., Rel.18), etc.

[0493] The UE may also perform operations such as Rel.15 / 16 without supporting at least one of the above-mentioned specific UE capabilities or without being set with the above-mentioned specific information.

[0494] (Supplement A)

[0495] The following inventions are added to one embodiment of the present disclosure.

[0496] [Note 1]

[0497] Terminal, with:

[0498] A control unit, for determining, for a plurality of transmit-receive points (TRPs) for coherent joint transmission (CJT), a plurality of frequency domain bases common to the plurality of TRPs or individual to each TRP; and

[0499] A sending unit sends a report of channel state information (CSI) based on the multiple frequency domain bases.

[0500] [Note 2]

[0501] The terminal described in Supplement 1,

[0502] The control unit determines the multiple frequency domain bases from a window common to the multiple TRPs, or from a separate window for each TRP.

[0503] [Note 3]

[0504] The terminal described in Appendix 1 or Appendix 2,

[0505] The multiple second frequency domain bases for the second TRP within the multiple TRPs include multiple first frequency domain bases for the first TRP within the multiple TRPs.

[0506] [Note 4]

[0507] The terminal described in any one of Notes 1 to 3,

[0508] The control unit determines the multiple frequency domain bases for a group associated with one or more TRPs within the multiple TRPs.

[0509] (Supplementary Note B)

[0510] Regarding one embodiment of the present disclosure, the following transmission is attached.

[0511] [Note 1]

[0512] Terminal, with:

[0513] a receiving unit receiving one or more parameters for a plurality of transmit receive points (TRPs) for coherent joint transmission (CJT); and

[0514] The control unit determines the maximum number of non-zero coefficients for the multiple TRPs based on the one or more parameters.

[0515] [Note 2]

[0516] The terminal described in Supplement 1,

[0517] Each of the one or more parameters corresponds to each TRP, or corresponds to a group associated with one or more TRPs within the plurality of TRPs.

[0518] [Note 3]

[0519] The terminal described in Appendix 1 or Appendix 2,

[0520] the control unit,

[0521] For the plurality of TRPs, determining a bitmap representing the non-zero coefficients, or

[0522] For each group associated with one or more TRPs within the plurality of TRPs, a bitmap representing the non-zero coefficients is determined.

[0523] [Note 4]

[0524] The terminal described in any one of Notes 1 to 3,

[0525] The control unit determines the strongest coefficient indicator for a group and polarization associated with one or more TRPs within the plurality of TRPs.

[0526] (Wireless Communication System)

[0527] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0528] Fig. 271 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0529] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0530] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0531] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0532] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0533] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0534] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (lower than 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (higher than 24 GHz (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0535] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0536] Multiple base stations 10 may also be connected via wired (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0537] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0538] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0539] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), 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.

[0540] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0541] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)) and the like may be used.

[0542] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like may be used as uplink channels.

[0543] The PDSCH transmits user data, high-layer control information, system information block (SIB), etc. The PUSCH transmits user data, high-layer control information, etc. In addition, the PBCH transmits the master information block (MIB).

[0544] The PDCCH may also transmit lower layer control information. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0545] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0546] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0547] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be rewritten mutually.

[0548] Through PUCCH, uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.) and scheduling request (SR) can also be transmitted. Through PRACH, random access preambles for establishing a connection with a cell can also be transmitted.

[0549] In the present disclosure, downlink, uplink, etc. may be expressed without "link". In addition, various channels may be expressed without "Physical" at the beginning.

[0550] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted as DL-RS.

[0551] 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 also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0552] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0553] (Base Station)

[0554] Fig.28 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0555] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0556] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0557] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0558] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0559] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0560] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0561] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0562] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0563] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0564] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0565] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0566] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0567] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0568] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0569] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0570] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0571] The control unit 110 may also determine, for a plurality of transmit / receive points (TRPs) for coherent joint transmission (CJT), a plurality of frequency domain bases common to the plurality of TRPs or separate for each TRP. The transmitting / receiving unit 120 may also receive a report of channel state information (CSI) based on the plurality of frequency domain bases.

[0572] The transmitting and receiving unit 120 may also transmit one or more parameters for a plurality of transmit and receive points (TRPs) for coherent joint transmission (CJT). The control unit 110 may also control reception of a report of a maximum number of non-zero coefficients for the plurality of TRPs based on the one or more parameters.

[0573] (User Terminal)

[0574] Fig.29 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided with one or more.

[0575] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0576] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0577] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0578] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0579] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0580] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0581] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0582] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0583] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0584] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0585] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0586] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0587] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0588] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0589] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, 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 also be output to the control unit 210.

[0590] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0591] The control unit 210 may also determine, for a plurality of transmit / receive points (TRPs) for coherent joint transmission (CJT), a plurality of frequency domain bases common to the plurality of TRPs or separate for each TRP. The transmitting / receiving unit 220 may also transmit a report of channel state information (CSI) based on the plurality of frequency domain bases.

[0592] The control unit may also determine the multiple frequency domain bases from a window common to the multiple TRPs, or from a separate window for each TRP.

[0593] The multiple second frequency domain bases for the second TRP within the multiple TRPs may also include multiple first frequency domain bases for the first TRP within the multiple TRPs.

[0594] The control unit may also determine the multiple frequency domain bases for a group associated with one or more TRPs within the multiple TRPs.

[0595] The transmitting and receiving unit 220 may also receive one or more parameters for a plurality of transmit and receive points (TRPs) for coherent joint transmission (CJT). The control unit 210 may also determine a maximum number of non-zero coefficients for the plurality of TRPs based on the one or more parameters.

[0596] Each of the one or more parameters may correspond to each TRP, or may correspond to a group associated with one or more TRPs within the plurality of TRPs.

[0597] The control unit may determine a bitmap representing the non-zero coefficients for the plurality of TRPs, or determine a bitmap representing the non-zero coefficients for each group associated with one or more TRPs within the plurality of TRPs.

[0598] The control unit may also determine the strongest coefficient indicator for a group and polarization associated with one or more TRPs within the plurality of TRPs.

[0599] (Hardware Structure)

[0600] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0601] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method thereof is not particularly limited.

[0602] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.30 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0603] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be interchangeably used. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0604] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0605] Regarding the various functions in the base station 10 and the user terminal 20, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs calculations and controls the communication via the communication device 1004, or by controlling at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0606] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0607] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0608] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0609] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0610] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0611] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0612] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0613] In addition, the base station 10 and the user terminal 20 may also 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 the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0614] (Variation Example)

[0615] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be rewritten with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0616] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0617] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filtering process performed by a transmitter and receiver in the frequency domain, a specific windowing process performed by a transmitter and receiver in the time domain, and the like.

[0618] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0619] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0620] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be replaced with each other.

[0621] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0622] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0623] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0624] In addition, when a time slot or a mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0625] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0626] In addition, a long TTI (e.g., normal TTI, subframe, etc.) can also be rewritten as a TTI with a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) can also be rewritten as a TTI with a TTI length shorter than that of the long TTI and longer than 1 ms.

[0627] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0628] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0629] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0630] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0631] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, common RBs may also be identified by the index of the RB relative to the common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0632] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0633] At least one of the set BWPs may be activated, and the UE may not assume that a specific signal / channel is transmitted or received outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0634] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0635] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0636] In the present disclosure, the names used for parameters, etc. are not restrictive in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not restrictive in all respects.

[0637] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0638] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0639] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0640] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0641] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0642] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0643] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0644] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0645] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0646] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0647] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission 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" can be used interchangeably.

[0648] In the present 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" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0649] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that performs communication services within the coverage area.

[0650] In the present disclosure, the base station sending information to the terminal may also be rewritten with the base station instructing the terminal to control / operate based on the information.

[0651] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0652] There are also cases where a mobile station is referred to as 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, hand set, user agent, mobile client, client or some other appropriate terminology.

[0653] At least one of the base station and the mobile station may also be referred to as a transmission device, a reception device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a moving object, a moving object body, etc.

[0654] The mobile body refers to a movable object, and the moving speed is arbitrary, including the case where the mobile body is stopped. The mobile body includes, for example, vehicles, transport vehicles, cars, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, carts, rickshaws, ships (ships and other watercraft), airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, hot air balloons, and objects carried on them, but is not limited to these. In addition, the mobile body can also be a mobile body that drives autonomously based on operating instructions.

[0655] The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0656] Fig.31 1 is a diagram showing an example of a vehicle according to an 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, an air 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.

[0657] The driving unit 41 is composed of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is composed of at least a steering wheel (also called a handle), and steers at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0658] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an electronic control unit (Electronic Control Unit (ECU)).

[0659] As signals from various sensors 50-58, there are the following signals, etc.: a current signal from a current sensor 50 for sensing the current of a motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by a speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of an accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of a brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of a shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0660] The information service unit 59 is composed of various devices for providing (outputting) various information such as driving information, traffic information, entertainment information, etc., such as a navigation system, an audio system, a speaker, a display, a television, and a radio, and one or more ECUs for controlling these devices. The information service unit 59 uses information obtained from an external device via the communication module 60, etc. to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0661] The information service unit 59 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0662] The driving assistance system unit 64 is composed of various devices for providing functions for preventing accidents before they happen or reducing the driver's driving burden, such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning detector (for example, Global Navigation Satellite System (GNSS)), map information (for example, High Definition (HD) map, Autonomous Vehicle (AV) map, etc.), gyroscope system (for example, inertial measurement unit (Inertial Measurement Unit (IMU))), inertial navigation unit (Inertial Navigation System (INS))), artificial intelligence (Artificial Intelligence (AI)) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 to realize the driving assistance function or the automatic driving function.

[0663] The communication module 60 can communicate with the microprocessor 61 and the structural elements of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) with the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 of the vehicle 40 via the communication port 63.

[0664] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device that can communicate with an external device. For example, various information is sent and received with the external device via wireless communication. The communication module 60 can be inside or outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it can also function as at least one of the base station 10 and user terminal 20).

[0665] The communication module 60 may also transmit at least one of the signals from the various sensors 50-58 input to the electronic control unit 49, the information obtained based on the signals, and the information based on the input from the outside (user) obtained via the information service unit 59 to the external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted by the communication module 60 may also include information based on the above input.

[0666] The communication module 60 receives various information (traffic information, signal information, vehicle information, etc.) sent from an external device, and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 may also be referred to as an output unit for outputting information (for example, outputting information to a display, a speaker, etc. based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0667] In addition, the communication module 60 stores various information received from the external device in the memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the various sensors 50-58, etc., which are provided in the vehicle 40.

[0668] In addition, the base station in the present disclosure may also be rewritten as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink", "downlink", etc. may also be rewritten as terms corresponding to communication between terminals (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0669] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0670] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node according to the circumstances. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal can obviously be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0671] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, timings, flow charts, etc. of the various methods / implementations described in this disclosure may be swapped in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0672] The various modes / implementations described in the present disclosure may also be applied to 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 (x is, for example, an integer or a 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 (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems that are expanded, modified, generated, or specified based on them. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0673] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0674] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0675] The term "determining" used in the present disclosure may include a variety of operations. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0676] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0677] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0678] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0679] The “maximum transmit power” recorded in the present disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated maximum transmit power).

[0680] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be rewritten as "access".

[0681] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-inclusive examples, being "connected" or "combined" to each other using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc.

[0682] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0683] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0684] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0685] In the present disclosure, "below", "less than", "above", "more", "equal to", etc. may also be rephrased with each other. Furthermore, in the present disclosure, words meaning "good", "bad", "big", "small", "high", "low", "early", "slow", "wide", "narrow", etc. are not limited to the original form, comparative form and superlative form, but may also be rephrased with each other. Furthermore, in the present disclosure, words meaning "good", "bad", "big", "small", "high", "low", "early", "slow", "wide", "narrow", etc. are not limited to the original form, comparative form and superlative form, but may also be rephrased with each other as expressions with "the ith" (i is an arbitrary integer) attached thereto (for example, "the highest" may also be rephrased with "the ith highest").

[0686] In the present disclosure, “of”, “for”, “regarding”, “related to”, “associated with”, etc. may be replaced by each other.

[0687] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: a receiving unit receiving one or more parameters for a plurality of transmit receive points (TRPs) for coherent joint transmission (CJT); and The control unit determines the maximum number of non-zero coefficients for the multiple TRPs based on the one or more parameters.

2. The terminal according to claim 1, wherein: Each of the one or more parameters corresponds to each TRP, or corresponds to a group associated with one or more TRPs within the plurality of TRPs.

3. The terminal according to claim 1, wherein: the control unit, For the plurality of TRPs, determining a bitmap representing the non-zero coefficients, or For each group associated with one or more TRPs within the plurality of TRPs, a bitmap representing the non-zero coefficients is determined.

4. The terminal according to claim 1, wherein: The control unit determines the strongest coefficient indicator for a group and polarization associated with one or more TRPs within the plurality of TRPs.

5. A wireless communication method of a terminal, comprising: receiving one or more parameters for a plurality of transmit receive points (TRPs) for coherent joint transmission (CJT); and The step of determining a maximum number of non-zero coefficients for the plurality of TRPs based on the one or more parameters.

6. A base station, comprising: a transmitting unit that transmits one or more parameters for a plurality of transmit receive points (TRPs) for coherent joint transmission (CJT); and A control unit, based on the one or more parameters, controls the reception of a report following the maximum number of non-zero coefficients for the plurality of TRPs.

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