Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to one aspect of the present disclosure comprises: a control unit that determines channel state information (CSI) on the basis of a plurality of measurements respectively corresponding to a plurality of panels used for coherent joint transmission; and a transmission unit that transmits a CSI report including the CSI. According to the one aspect of the present disclosure, the CSI report for CJT can be appropriately performed.

Description

Terminal, wireless communication method and base station

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

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered.

[0004] 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

[0005] In future wireless communication systems (e.g., NR), it is being considered to report channel state information (CSI) based on reception of reference signals. It is also being considered to have multiple transmission / reception points (TRPs, Multi-TRP (MTRP)) or multiple panels (multiple panels, multi-panel) perform DL transmission to a terminal (user terminal, User Equipment (UE)). Coherent joint transmission (CJT) using multi-TRP / multi-panel is also being considered.

[0006] However, there has been little progress in the study of how to set and report CSI for CJT. Unless such a method is clearly defined, there is a risk that communication throughput and communication quality may deteriorate.

[0007] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately report CSI to CJT.

[0008] A terminal according to one aspect of the present disclosure includes a control unit that determines channel state information (CSI) based on a plurality of measurements corresponding to a plurality of panels used for coherent joint transmission, and a transmission unit that transmits a CSI report including the CSI.

[0009] According to one aspect of the present disclosure, CSI reporting to the CJT can be performed appropriately.

[0010] Figure 1 shows an example of a MIMO antenna model. Figure 2 shows an example of the maximum number of antenna model elements. Figure 3 shows an example of an antenna model for a Type 1 single panel. Figure 4 shows an example of an antenna model for a Type 1 multi-panel. Figure 5 shows an example of a 16-level quantization table. Figure 6 shows an example of an 8-level quantization table. Figure 7 shows an example of a transmission using K CSI-RS ports. Figures 8A and 8B show an example of a Rel. 16 Type 2 port selection codebook. Figures 9A and 9B show an example of a Rel. 17 Type 2 port selection codebook. Figures 10A and 10B show examples of NCJT and CJT. Figures 11A and 11B show examples of inter-site multi-TRP and intra-site multi-TRP. Figure 12 shows an example of Option 1-1. Figure 13 shows another example of Option 1-1. Figure 14 shows an example of Option 1-2. Figures 15A and 15B show an example of Option 2-A. Figure 16 shows an example of CJT CSI for Option 3-A. Figure 17 shows an example of a codebook for Option 3-A. Figure 18 shows an example of CJT CSI for Option 3-B. Figure 19 shows an example of a codebook for Option 3-B. Figure 20 shows an example of CJT CSI for Option 3-C. Figure 21 shows an example of CJT CSI for Option 3-D. Figure 22 shows an example of a new table for an inter-TRP amplitude codebook. Figure 23 shows an example of a new table for an inter-TRP phase codebook. Figure 24 shows an example of a new table for an inter-TRP coefficient codebook. Figures 25A and 25B show an example of a mapping order for CSI Parts 1 and 2 according to embodiment #A5. Figures 26A and 26B show an example of Constraint 2. Figure 27 shows an example of Report 2a-1. Figure 28 shows an example of Report 2a-2. Figure 29 shows an example of Report 2b. Fig. 30 shows an example of CSI parts 1 and 2 according to embodiment #C4. Fig. 31 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. Fig. 32 is a diagram showing an example of a configuration of a base station according to an embodiment. Fig. 33 is a diagram showing an example of a configuration of a user terminal according to an embodiment. Fig. 34 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment.FIG. 35 is a diagram illustrating an example of a vehicle according to an embodiment.

[0011] (CSI Report or Reporting) In Rel. 15 NR, 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 a resource for the RS), and transmits (also referred to as reporting, feedback, etc.) the generated CSI to a network (e.g., a base station). The CSI may be transmitted to the base station, for example, using an uplink control channel (e.g., a Physical Uplink Control Channel (PUCCH)) or an uplink shared channel (e.g., a Physical Uplink Shared Channel (PUSCH)).

[0012] The RS used to generate the CSI may be, for example, at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), a Demodulation Reference Signal (DMRS), etc.

[0013] The CSI-RS may 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 an SS and a PBCH (and corresponding DMRS), and may be referred to as an SS block (SSB). The SS may include at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

[0014] The CSI may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), L1-SNR (Signal to Noise Ratio), and the like.

[0015] The UE may receive information related to CSI reporting (report configuration information) and control CSI reporting based on the report configuration information. The report configuration information may be, for example, "CSI-ReportConfig" of an information element (IE) of Radio Resource Control (RRC). Note that in the present disclosure, the RRC IE may be interchangeably read as an RRC parameter, an upper layer parameter, or the like.

[0016] The reporting configuration information (e.g., "CSI-ReportConfig" of the RRC IE) may include, for example, at least one of the following: - Information on the type of CSI report (report type information, e.g., "reportConfigType" of the RRC IE) - Information on one or more quantities of CSI to be reported (one or more CSI parameters) (report quantity information, e.g., "reportQuantity" of the RRC IE) - Information on RS resources used to generate the quantities (the CSI parameters) (resource information, e.g., "CSI-ResourceConfigId" of the RRC IE) - Information on the frequency domain targeted for CSI reporting (frequency domain information, e.g., "reportFreqConfiguration" of the RRC IE)

[0017] For example, the report type information may indicate a periodic CSI (P-CSI) report, an aperiodic CSI (A-CSI) report, or a semi-persistent CSI (SP-CSI) report.

[0018] Furthermore, the reporting amount information may specify a combination of at least one of the above CSI parameters (for example, CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0019] The resource information may also be an ID of a resource for the RS. The resource for the RS may include, for example, a non-zero-power CSI-RS resource or an SSB, and a CSI-IM resource (for example, a zero-power CSI-RS resource).

[0020] The frequency domain information may also indicate frequency granularity of the CSI report. The frequency granularity may include, for example, a wideband and a subband. The wideband is the entire CSI reporting band. The wideband may be, for example, the entirety of a certain carrier (a component carrier (CC)), a cell, or a serving cell) or the entirety of a 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.

[0021] Furthermore, a subband is a part of a wideband and may be configured with one or more resource blocks (RBs or PRBs). The size of the subband may be determined according to the size of the BWP (the number of PRBs).

[0022] The frequency domain information may indicate whether wideband or subband PMI is to be reported (the frequency domain information may include, for example, an RRC IE "pmi-FormatIndicator" used to determine whether wideband PMI reporting or subband PMI reporting is to be performed). The UE may determine the frequency granularity of CSI reporting (i.e., whether wideband PMI reporting or subband PMI reporting is to be performed) based on at least one of the reporting amount information and the frequency domain information.

[0023] When wideband PMI reporting is configured, one wideband PMI may be reported for the entire CSI reporting band, whereas when subband PMI reporting is configured, a single wideband indication i1 may be reported for the entire CSI reporting band, and one subband indication i2 (e.g., a subband indication for each subband) may be reported for each of one or more subbands within the entire CSI reporting band.

[0024] The UE performs channel estimation using the received RS to estimate a channel matrix H. The UE feeds back a PMI determined based on the estimated channel matrix.

[0025] The PMI may indicate a precoder matrix (also simply referred to as a precoder) that the UE considers appropriate for use in downlink (DL) transmissions to the UE. Each value of the PMI may correspond to one precoder matrix. A set of PMI values ​​may correspond to a set of different precoder matrices, called a precoder codebook (also simply referred to as a codebook).

[0026] In the space domain, a CSI report may include one or more types of CSI. For example, the CSI may include at least one of a first type (Type 1 CSI) used for single-beam selection and a second type (Type 2 CSI) used for multi-beam selection. The single beam may be rephrased as a single layer, and the multi-beam may be rephrased as multiple beams. Furthermore, Type 1 CSI does not assume multi-user multiple input multiple output (MIMO), while Type 2 CSI may assume multi-user MIMO.

[0027] The codebook may include a codebook for Type-1 CSI (also referred to as a Type-1 codebook, etc.) and a codebook for Type-2 CSI (also referred to as a Type-2 codebook, etc.). Furthermore, Type-1 CSI may include Type-1 single-panel CSI and Type-1 multi-panel CSI, and different codebooks (Type-1 single-panel codebook, Type-1 multi-panel codebook) may be defined for each.

[0028] In the present disclosure, Type 1 and Type I may be interpreted as interchangeable. In the present disclosure, Type 2 and Type II may be interpreted as interchangeable.

[0029] The uplink control information (UCI) type may include at least one of a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), a scheduling request (SR), and CSI. The UCI may be carried by the PUCCH or the PUSCH.

[0030] In Rel. 15 NR, UCI may contain one CSI part for wideband PMI feedback. CSI report #n contains PMI wideband information if reported.

[0031] In Rel. 15 NR, UCI can include two CSI parts for subband PMI feedback. CSI Part 1 includes wideband PMI information. CSI Part 2 includes one wideband PMI and several subband PMIs. CSI Part 1 and CSI Part 2 are coded separately.

[0032] In Rel. 15 NR, a UE is configured by higher layers with N (N≧1) CSI reporting configuration report settings and M (M≧1) CSI resource configuration resource settings. For example, the CSI reporting configuration (CSI-ReportConfig) includes a channel measurement resource setting (resourcesForChannelMeasurement), a CSI-IM resource setting for interference (csi-IM-ResourceForInterference), an NZP-CSI-RS resource setting for interference (nzp-CSI-RS-ResourceForInterference), and a report quantity (reportQuantity). The channel measurement resource setting, the interference CSI-IM resource setting, and the interference NZP-CSI-RS resource setting are each associated with a CSI resource configuration (CSI-ResourceConfig, CSI-ResourceConfigId). The CSI resource configuration 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).

[0033] For both FR1 and FR2, evaluation and provision of CSI reporting for DL ​​multi-TRP and / or multi-panel transmissions is under consideration to enable more dynamic channel / interference hypotheses for NCJT.

[0034] (Multi-TRP) In NR, one or more transmission / reception points (TRP) (multi-TRP (MTRP)) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs using one or more panels.

[0035] Note that 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.

[0036] The multi-TRPs (TRPs #1 and #2) may be connected by an ideal / non-ideal backhaul to exchange information, data, etc. Each TRP of the multi-TRP may transmit a different code word (CW) and a different layer. Non-Coherent Joint Transmission (NCJT) may be used as a form of multi-TRP transmission.

[0037] In the NCJT, for example, TRP1 modulates and layer-maps a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP2 modulates and layer-maps a second codeword to transmit a second PDSCH using a second number of layers (e.g., two layers) with a second precoding.

[0038] Note that multiple PDSCHs (multi-PDSCHs) that are non-coherent may be defined as partially or completely overlapping in time and / or frequency domains, i.e., a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in time and / or frequency resources.

[0039] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0040] Multiple PDSCHs from multiple TRPs (which may be referred to as multiple PDSCHs) may be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single master mode). One DCI may be transmitted from one TRP of the multiple TRPs. Multiple PDSCHs from multiple TRPs may be scheduled using multiple DCIs (multiple DCI (M-DCI), multiple PDCCHs) (multiple master mode). Multiple DCIs may be transmitted from the multiple TRPs. The UE may be assumed to transmit separate CSI reports for each TRP for different TRPs. Such CSI feedback may be referred to as separate feedback, separate CSI feedback, etc. In the present disclosure, "separate" may be interchangeably read as "independent."

[0041] In addition, CSI feedback may be used in which CSI reports regarding both TRPs are transmitted to one TRP. Such CSI feedback may be called joint feedback, joint CSI feedback, etc.

[0042] For example, in the case of separate feedback, the UE is configured to transmit a CSI report for TRP#1 using one PUCCH (PUCCH1) for TRP#1 and a CSI report for TRP#2 using another PUCCH (PUCCH2) for TRP#2. In the case of joint feedback, the UE transmits a CSI report for TRP#1 and a CSI report for TRP#2 for TRP#1 or #2.

[0043] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0044] (Codebook Configuration) The UE is configured with parameters related to the codebook (codebook configuration (CodebookConfig)) by higher layer signaling (RRC signaling). The codebook configuration is included in the CSI report configuration (CSI-ReportConfig) of the higher layer (RRC) parameters.

[0045] In the codebook setting, at least one codebook is selected from among type 1 single panel (type I-Single Panel), type 1 multi-panel (type I-Multi Panel), type 2 (type II), and type 2 port selection (type II-Port Selection).

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

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

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

[0049] For CSI reporting related to multi-TRP / panel NCJT measurements configured by a single CSI reporting configuration, it is considered that at least one of the following options 1 and 2 will be supported.

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

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

[0052] As described above, in Rel. 15 / 16, the CBSR is configured per codebook configuration per CSI reporting configuration, i.e., the CBSR applies to all CMRs, etc. within the corresponding CSI reporting configuration.

[0053] However, in the CSI reporting configuration for Rel. 17 multi-TRP, when the above-mentioned options 1 and 2 are applied, the following measurement configurations may be performed: Option 1 (X = 0): Measurement of NCJT CSI only. Option 1 (X = 1): Measurement of NCJT CSI and CSI of a single TRP (one TRP). Option 1 (X = 2): Measurement of NCJT CSI and CSI of a single TRP (two TRPs). Option 2: Measurement of both NCJT CSI and CSI of a single TRP.

[0054] (MIMO Antenna Model) The antenna of the TRP / UE consists of one or more panels. The 2D antenna configuration is described using at least one of the following parameters, as shown in Figure 1: N1 is the number of antenna elements in the horizontal direction of one panel. N2 is the number of antenna elements in the vertical direction of one panel. N g1 is the number of panels arranged horizontally. g2 is the number of panels arranged vertically. H is the distance between two horizontally adjacent antenna elements in one panel. V is the distance between two vertically adjacent antenna elements in one panel. H,P is the distance between two horizontally adjacent antenna elements between two horizontally adjacent panels. V,P is the spacing between two vertically adjacent antenna elements between two vertically adjacent panels. P is the number of polarizations. If P=2, two antenna elements each using different polarizations (e.g., horizontal and vertical polarizations) are placed at one position within the panel.

[0055] d H,P (d V,P ) is typically d H (d V ) is equal to or greater than the number of panels N g =N g1 *N g2 is.

[0056] The panels in the UE may face different directions, for example, two panels facing directions 0 and 180 degrees, or four panels facing directions 0, 90, 180, and 270 degrees, respectively.

[0057] As shown in Figure 2, the maximum number of antenna elements (AE) of a TRP and the maximum number of antenna elements of a UE are specified for each frequency.

[0058] (Type 1 Codebook) A Type 1 single panel codebook and a Type 1 multi-panel codebook are specified for the base station panel. In the Type 1 single panel, the number of CSI-RS antenna ports P CSI-RS For (N1, N2), the antenna model of the CSI antenna port array (logical configuration) is specified (Figure 3). In Type 1 multi-panel, the number of CSI-RS antenna ports P CSI-RS and (N g , N1, N2), an antenna model of the CSI antenna port array (logical configuration) is specified (Figure 4).

[0059] For Rel. 15 Type 1 Single Panel CSI, the UE sets the codebook type upper layer parameter (subType in type1 in codebookType in CodebookConfig) to Type 1 Single Panel ('typeI-SinglePanel'). If the number of layers v is not {2,3,4}, the PMI value is calculated based on the three codebook indices i 1,1 ,i 1,2 , i2. When the number of layers v∈{2,3,4}, the PMI values ​​correspond to the four codebook indices i 1,1 ,i 1,2 ,i 1,3 , i2. If the number of layers v is not {2,3,4}, then the composite codebook index i1 = [i 1,1 ,i 1,2 ]. When the number of layers v∈{2,3,4}, the composite codebook index i1=[i 1,1 ,i 1,2 ,i1,3 ].

[0060] Number of CSI antenna ports P CSI-RS The supported settings (combinations of values) of (N1,N2) and (O1,O2) are defined in the specification. (N1,N2) indicates 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. The i corresponding to the horizontal beam 1,1 is {0,1,...,N1O1-1}. The i corresponding to the vertical beam 1,2 is {0,1,...,N2O2-1}. i2 is {0,1,2,3}. For codebook mode (codebookMode) = 1, antenna ports 3000 to 2999+P CSI-RS The matrix for the 1-layer CSI reporting codebook using 1,1 ,i 1,2 ,i2^(1), where W l,m,n (1) is given by the following equation:

[0061] For Rel. 15 Type 1 multi-panel CSI, compared to Type 1 single panel, in addition to N1 and N2, the number of panels N g is set as inter-panel co-phasing (phase compensation between panels), i, 1,4 The same SD beam (precoding matrix W l ) is selected and only inter-panel phase matching is additionally reported.

[0062] Number of CSI antenna ports P CSI-RS Supported (N g The settings (combination of values) of (N1,N2) and (O1,O2) are defined in the specification. (N1,N2) are set by ng-n1-n2 in typeI-MultiPanel. i1,1 is {0,1,...,N1O1-1}. i 1,2 is {0,1,...,N2O2-1}. q=1,...,N g -1 vs. i 1,4,q is {0,1,2,3}. i2 is {0,1,2,3}. For codebook mode (codebookMode) = 1, antenna ports 3000 to 2999+P CSI-RS The matrix for the 1-layer CSI reporting codebook using 1,1 ,i 1,2 ,i 1,4 ,i2^(1), where W l,m,p,n (1) =W l,m,p,n ^1,N g ,1.

[0063] N g =W_l,m,p,n^1,N for {2,4} g ,1 and W_l,m,p,n^2,N g ,1 (first layer, N g = 2, matrix W for codeBookMode = 1 l,m,p,n 1,2,1 and the second layer, N g = 2, matrix W for codeBookMode = 1 l,m,p,n 2,2,1 and the first layer, N g = 4, matrix W for codeBookMode = 1 l,m,p,n 1,4,1 and the second layer, N g = 4, matrix W for codeBookMode = 1 l,m,p,n 2,4,1 and ) are given by the following equations:

[0064] where φ n =e jπn / 2 N g =2, p=p1, and N gFor φ = 4, p = [p1, p2, p3]. φ_p1, φ_p2, and φ_p3 represent inter-panel phase matching. The same beam (SD beam matrix, precoding matrix W) is used for panels 0, 1, 2, and 3. l ) are selected, φ_p1 represents the phase compensation of panel 1 relative to panel 0, φ_p2 represents the phase compensation of panel 2 relative to panel 0, and φ_p3 represents the phase compensation of panel 3 relative to panel 0.

[0065] (Type 2 Codebook) Assuming an ideal backhaul, synchronization, and the same number of antenna ports across multiple TRPs, CSI acquisition for coherent joint transmission (CJT) for FR1 and up to four TRPs is considered. An improvement to the Rel. 16 / 17 Type 2 codebook is considered for CJT multi-TRP for FDD.

[0066] In this disclosure, a matrix Z with X rows and Y columns may be expressed as Z(X×Y).

[0067] In Rel. 15 Type 2 CSI, for a given layer k, the generation of a subband-wise (SB-wise) precoding vector is based on the following equation: W k (N t ×N3) = W1W 2,k (Y1)

[0068] N t is the number of ports. N3 is the total number of precoding matrices (precoders) indicated by the PMI (number of subbands). W1(N t ×2L) is a matrix (SD beam matrix) consisting 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 each b i ,b j W 2,k(2L×N3) is the subband complex linear combination (LC) coefficient matrix for layer k. W 2,k represents the beam selection and co-phasing between the two polarizations. For example, 2,k are c i ,c j For example, the channel matrix h is a linear combination of L=2 SD 2D-DFT vectors, c i b i ,+c j b j The feedback overhead is mainly due to the LC coefficient matrix W 2,k Also, Type 2 CSI in Rel. 15 only supports ranks 1 and 2.

[0069] Rel. 16 Type 2 CSI uses frequency domain (FD) compression to reduce the W 2,k Rel. 16 Type 2 CSI supports ranks 3 and 4 in addition to ranks 1 and 2.

[0070] In Rel. 16, Type 2 CSI may be reported by the UE for a given layer k, based on the following equation: W k = W1W ~ k W f,k H (Y2)

[0071] W 2,k is W ~ k W f,k H It is approximated by the matrix W ~ can be expressed by adding a tilde (~) to W. f,k H is W f,k is the adjoint matrix of

[0072] For CSI reporting, the UE may be configured with one of two subband sizes: NPRB SB The number of PMI subbands per CQI subband, R, is defined as consecutive PRBs and may depend on the total number of PRBs in the BWP. The number of PMI subbands per CQI subband, R, is configured by the RRC IE (numberOfPMI-SubbandsPerCQI-Subband). R controls the total number of precoding matrices, N3, represented by the PMI, as a function of the number of subbands configured in the csi-ReportingBand, the subband size configured by subbandSize, and the total number of PRBs in the BWP.

[0073] W1(N t ×2L) is a matrix consisting of multiple (oversampled) spatial domain (SD) 2D-DFT (vector, beam). For this matrix, multiple indices of the 2D Discrete Fourier Transform (2D-DFT) vector and the 2D over-sampling factor are reported. The spatial domain response / distribution represented by the SD 2D-DFT vector may be called an SD beam.

[0074] W ~ k (2L×M v ) is a matrix of combination coefficients (subband complex linear combination (LC) coefficients). For this matrix, up to K0 non-zero coefficients (NZCs) are reported. The report consists of two parts: a bitmap capturing the NZC positions and the quantized NZCs.

[0075] W f,k (N3×M v ) is a matrix consisting of multiple frequency domain (FD) bases (vectors) for layer k. For each layer, M v There are FD bases (FD DFT bases). If N3 > 19, there are M vDFTs are selected. If N3≦19, log2(C(N3−1,M v -1)) bits are reported, where C(N3-1,M v -1) is N3-1 to M v The number of combinations for selecting 1 is also called the binomial coefficients. The frequency domain response / distribution (frequency response) represented by a linear combination of the FD basis vectors and the combination coefficients may be called an FD beam. The FD beam may correspond to a delay profile (time response).

[0076] A subset of the FD basis is {f1,...,f Mv} where f i is the i-th FD basis for the k-th layer, i∈{1,...,M v}. The PMI subband size is given by CQI subband size / R, where R∈{1,2}. The number of FD bases for a given rank v is M v is ceil(p v ×N3 / R). The number of FD bases is the same for all layers k∈{1,2,3,4}. p v is set by higher layers.

[0077] Matrix W 2,k Each row of represents the channel frequency response of a particular SD beam. If the SD beam has high directivity, the channel taps per beam are limited (the power delay profile becomes sparse in the time domain). As a result, the channel frequency response per SD beam has high correlation (approaches 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, M v = 2, the FD basis f2,f q and the linear combination coefficient d1 0 ,d2 0 and the frequency response associated with the SD beam b0 is given by d1 0 f2+,d2 0 f q is approximated by

[0078] Maximum gain M v FD bases are selected. M v <<By setting it to N3, W ~ k The overhead of W 2,k The overhead is much smaller than that of M v All or some of the FD bases are used to approximate the frequency response of each SD beam. A bitmap is used to report only the FD bases selected for each SD beam. If no bitmap is reported, all FD bases are selected for each SD beam. In this case, the nonzero coefficients (NZCs) of all FD bases are reported for each SD beam. The maximum number of NZCs in a layer, K, is k NZ ≦K0=ceil(β×2LM v ) and the maximum number of NZCs across all layers is K NZ ≦2K0=ceil(β×2LM v ) where β is set by higher layers.

[0079] W ~ k Each reported complex coefficient in is a separately quantized amplitude and phase. Amplitude Quantization: Polarization-specific reference amplitudes are 16-level quantized using the table in Figure 5. All other coefficients are 8-level quantized using the table in Figure 6. Phase Quantization: All coefficients are quantized using 16-PSK. For example, φ l,i = exp(j2πc l,i / 16), c l,i ∈{0,...,15}, where c l,i is the associated phase value φ l,i is the phase factor reported by the UE (using 4 bits) for

[0080] Type 2 CSI feedback on PUSCH in Rel. 16 includes 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 (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. The base station knows the size of CSI Part 2 after receiving CSI Part 1.

[0081] In enhanced Type 2 CSI feedback, CSI Part 1 includes RI, CQI, and an indication of the total number of non-zero amplitudes across layers for enhanced Type 2 CSI. The fields in Part 1 are coded separately. CSI Part 2 includes PMI for enhanced Type 2 CSI. Parts 1 and 2 are coded separately. CSI Part 2 (PMI) includes the oversampling factor, the index of the 2D-DFT basis, and the index M of the initial DFT basis (start offset) of the selected DFT window. initial the selected DFT basis for each layer; the non-zero LC coefficients (NZC, amplitude and phase) for each layer; the strongest coefficient indicator (SCI) for each layer; and the amplitude of the strongest coefficient for each layer / polarization.

[0082] The multiple PMI indices (PMI values, codebook indices) associated with different CSI Part 2 information may be as follows for the k-th layer: 1,1 : Oversampling factor i 1,2 : Multiple indices of 2D-DFT basis ・i 1,5 : Index (start offset) of the initial DFT basis of the selected DFT window M initial ・i 1,6,k : DFT basis selected for the kth layer ・i 1,7,k : Bitmap for the kth layer ・i 1,8,k: The strongest coefficient indicator (SCI) for the kth layer. 2,3,k : amplitude of the strongest coefficient (for both polarizations) of the kth layer ・i 2,4,k : the amplitude of the reported coefficient of the kth layer ・i 2,5,k : the phase of the reported coefficients of the kth layer

[0083] i 1,5 and i 1,6,k is the PMI index for DFT-based reporting. Only if N3>19, i 1,5 is reported.

[0084] For CSI Part 2 grouping, for a given CSI report, the PMI information is grouped into three groups (groups 0 to 2). This is important when CSI omission is performed. Index i 2,4,l , i 2,5,l , i 1,7,l Each reported element of is associated with a specific priority rule. Groups 0 to 2 follow: Group 0: Index i 1,1 , i 1,2 , i 1,8,l (l=1,...,v) Group 1: Index i (if reported) 1,5 , index i (if reported) 1,6,l , i 1,7,l The highest (top) v2LM v -floor(K NZ / 2) priority elements, i 2,3,l , i 2,4,l The highest (upper) ceil(K NZ / 2)-v priority elements, i 2,5,l The highest (upper) ceil(K NZ / 2)-v priority elements (l=1,...,v) Group 2: i 1,7,l The lowest (lowest) floor(K NZ / 2) priority elements, i 2,4,l The lowest (lowest) floor(K NZ / 2) priority elements, i 2,5,l The lowest (lowest) floor(K NZ / 2) priority elements (l=1,...,v)

[0085] In Rel. 16 Type-2 port selection (PS) CSI, the Type-2 PS codebook (CB) does not require the UE to derive an SD beam by considering the 2D-DFT in the regular Type-2 CB. Instead, the base station transmits CSI-RS using K CSI-RS ports that are beamformed by considering a set of SD beams (FIG. 7). The UE identifies the best L (≦K) CSI-RS ports and reports their indices in W1.

[0086] In Type-1 CSI, an SD beam represented by an SD DFT vector is sent toward the UE. In Type-2 CSI, L SD beams are linearly combined and sent toward the UE. Each SD beam can be associated with multiple FD beams. For the corresponding SD beam, the channel frequency response can be obtained by linearly combining the FD basis vectors. The channel frequency response corresponds to the power delay profile.

[0087] For layer k∈{1,2,3,4}, the subband-wise (subband(SB)-wise) precoder generation is given by: W k (N t ×N3) = QW1W ~ k W f,k H (Y3)

[0088] Here, Q(N t ×K) denotes the K SD beams used for CSI-RS beamforming. W1(K×2L) is a block diagonal matrix. W ~ k (2L×M) is the LC coefficient matrix. W f,k (N3×M) consists of N3 DFT basis vectors (FD basis vectors). K is set by the upper layer. L is set by the upper layer. P CSI-RS ∈{4,8,12,16,24,32}. P CSI-RS> 4, then L∈{2,3,4}.

[0089] (Rel. 17 Type 2 Port Selection Codebook) In the Rel. 15 / 16 Type 2 port selection (PS) CSI / codebook, each CSI-RS port #i is assigned to an SD beam (b i ) (Figures 8A and 8B). In the Rel. 17 Type 2 port selection CSI / codebook (extended Type 2 port selection codebook), each CSI-RS port #i is associated with an SD-FD beam pair (SD beam b i and FD beam f i,j (j is the frequency index) (FIGS. 9A and 9B). In this example, ports 3 and 4 are associated with the same SD beam and different FD beams.

[0090] The frequency selectivity of the channel frequency response observed at the UE based on an SD beam-FD beam pair can be reduced to less than the frequency selectivity of the channel frequency response observed at the UE based on an SD beam by delay pre-compensation.

[0091] The main scenario for the Type 2 port selection codebook in Rel. 17 is FDD. Although the channel reciprocity based on SRS measurements is not perfect, the base station can obtain some partial information. By using the SRS measurements at the base station in addition to the CSI reports, the base station can obtain the CSI for determining the DL MIMO precoder. In this case, some CSI reports may be omitted to reduce the CSI overhead.

[0092] In Rel. 17 Type-2 PS CSI, each CSI-RS port is beamformed using an SD beam and FD basis vectors, and each port is associated with an SD-FD pair.

[0093] For a given layer k, information based on the following equation may be reported by the UE: W k (K×N3) = W1W ~ k W f,k H (Y4)

[0094] For W1(K×2L), each matrix block consists of L columns of a K×K identity matrix. The base station transmits K beamformed CSI-RS ports. Each port is associated with an SD-FD pair. The UE selects L ports out of the K and assigns them the PMI (W 1,k ) to the base station. In Rel. 16, each port is associated with an SD beam.

[0095] W ~ k (2L×M v ) is a matrix of combining coefficients (subband complex LC coefficients). Up to 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 NZC position bitmap is always reported.

[0096] W f,k (N3×M v ) is a matrix consisting of N3 FD basis (FD DFT basis) vectors. v There are FD bases. The base station is f,k You can also erase W f,k If is on, M v additional FD bases are reported. f,k When is off, no additional FD basis is reported. f,k is always reported.

[0097] Regarding NCJT CSI of Rel. 17, K sTwo CMR groups with (=K1+K2) CMRs are configured in the UE, where K1 and K2 are the numbers of CMRs in the two CMR groups, respectively. N CMR pairs are configured by the higher layer by selecting from all possible pairs. N=1 and K s =2 is supported. max =2 is an optional feature of the UE. s,max =2 is an optional feature of the UE.

[0098] The UE may support at least one of the following two options: [Option 1] The UE may be configured to report X CSIs associated with single-TRP measurement hypotheses and one CSI associated with an NCJT measurement hypothesis. X may be 0, 1, or 2. If X=2, the two CSIs are associated with different single-TRP measurement hypotheses that use multiple CMRs from different CMR groups. Supporting X=1, 2 is an optional feature for this option. [Option 2] The UE may be configured to report one CSI associated with the best one of the NCJT measurement hypotheses and the single-TRP measurement hypothesis.

[0099] (JT) Joint transmission (JT) may refer to simultaneous data transmission from multiple points (eg, TRPs) to a single UE.

[0100] Rel. 17 supports NCJT from two TRPs. The PDSCHs from the two TRPs may be independently precoded and independently decoded. The frequency resources may be non-overlapping, partially overlapping, or fully overlapping. If overlap occurs, the PDSCH from one TRP will interfere with the PDSCH from the other TRP.

[0101] Figure 10A shows an example of NCJT from two TRPs. Signal x1 from the first TRP is precoded by precoding matrix V1 and transmitted, affected by channel matrix H1, and received as signal y1. Signal x2 from the second TRP is precoded by precoding matrix V2 and transmitted, affected by channel matrix H2, and received as signal y2. Layer i may be from one TRP, where H1 = U1ΣV1. H , H2=U2ΣV2 H , y1=H1V1x1, y2=H2V2x2.

[0102] Rel. 18 is considering supporting CJT using up to four TRPs. Data from the four TRPs may be coherently precoded and transmitted to the UE on the same time-frequency resource. For example, the same precoding matrix may be used to consider channels from the four TRPs. Coherence may mean that there is a certain relationship between the phases of the multiple received signals. Using four-TRP joint precoding, signal quality may be improved and there may be no interference between the four TRPs. Data may only be subject to interference outside the four TRPs.

[0103] Figure 10B shows an example of a CJT from four TRPs. Signals from the first to fourth TRPs are precoded by a precoding matrix V and transmitted. Signals x from the first to fourth TRPs are affected by channel matrices H1, H2, H3, and H4, respectively, and received as signal y. Layer i may be from four TRPs, where H = H1 + H2 + H3 + H4 = UΣV H , y=HVx.

[0104] In the ideal case (where four TRPs are co-located), a joint estimation of the aggregated channel matrix H can be performed, and a joint precoding matrix V can be fed back. However, the large-scale path losses of the four paths can vary significantly. A joint precoding matrix V based on a constant module codebook is not accurate. In this case, the feedback per TRP and the inter-TRP coefficients can be matched by the current NR type-2 codebook.

[0105] For a CJT of up to four TRPs in FR1, the selection of the four TRPs may be semi-static. Therefore, the selection and configuration of the four CMRs (four CSI-RS resources) for channel measurement may also be semi-static. Dynamic indication of the four TRPs from a list of CSI-RS resources is also possible, but unlikely.

[0106] The path losses from the four TRPs to the UE are different, which makes it difficult to simply report one aggregated CSI that represents the joint channel matrix.

[0107] Considering the fallback behavior to NCJT (i.e., single TRP), per-TRP CSI (i.e., single-TRP CSI like NCJT CSI in Rel. 17) is also important.

[0108] The following are considered: CMR and IMR for measurements of up to four TRPs. Per-TRP CSI with inter-TRP CSI feedback for X-TRP CJT (CJT using X TRPs). Inter-TRP CSI: New feedback and codebook for inter-TRP phase matrix / inter-TRP amplitude matrix / inter-TRP matrix (including both amplitude and phase). X-TRP CJT CQI can additionally be reported. Constraints on per-TRP CSI. Inter-TRP CSI / PMI details (e.g., inter-TRP phase or inter-TRP phase and amplitude).

[0109] For inter-site multi-TRP, per-TRP CSI feedback is considered. As shown in the example of Figure 11A, in inter-site multi-TRP (TRP1 / TRP2 / TRP3 / TRP4), the received power (P1 / P2 / P3 / P4), channel matrix (H1 / H2 / H3 / H4), and path loss (PL1 / PL2 / PL3 / PL4) from different TRPs are different. However, as shown in the example of Figure 11B, for intra-site multi-TRP (e.g., up to X panels at the same location (e.g., X=4, TRP1 / TRP2 / TRP3 / TRP4)), the received power, channel matrix, and path loss from the four TRPs (panels) can be the same, so per-TRP CSI feedback is not necessary. For intra-site multi-TRP CJT CSI, the Type 1 multi-panel codebook principle can be considered. If the operation of the multi-TRP CJT CSI within a site is not clear, it may result in a decrease in throughput, etc.

[0110] Therefore, the inventors conceived an operation for a CJT CSI using multiple TRPs / multiple panels.

[0111] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Each of the following embodiments (e.g., each case) may be used alone or in combination of at least two of them.

[0112] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0113] In the present disclosure, terms such as activate, deactivate, indicate, select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0114] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0115] In the present disclosure, 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.

[0116] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0117] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0118] In the present disclosure, the terms index, identifier (ID), indicator, resource ID, etc. may be interchangeable. In the present disclosure, the terms sequence, list, set, group, cluster, subset, etc. may be interchangeable.

[0119] In the present disclosure, the terms panel, panel group, beam, beam group, precoder, Uplink (UL) transmitting 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), resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, etc. may be read as interchangeable.

[0120] In the present disclosure, time domain resource allocation and time domain resource assignment may be read interchangeably.

[0121] In the present disclosure, beam, SD beam, SD vector, and SD 2D-DFT vector may be interchangeable. L, number of SD beams, number of beams, and number of SD 2D-DFT vectors may be interchangeable.

[0122] In this disclosure, FD basis, FD DFT basis, DFT basis, f i In the present disclosure, FD beam, FD vector, FD basis vector, FD DFT basis vector, and DFT basis vector may be interchangeable.

[0123] In the present disclosure, the terms coupling coefficient, LC coefficient, subband complex LC coefficient, and coupling coefficient matrix may be interpreted interchangeably.

[0124] In the present disclosure, panel, base station (gNB) panel, and TRP may be read interchangeably.

[0125] In the present disclosure, the terms co-phasing, phase matching, phase compensation, phase adjustment, phase difference, and phase relationship may be read interchangeably.

[0126] (Wireless Communication Method) In each embodiment, at least one of the Type 2 CSI report in Rel. 16, the Type 2 port selective CSI report in Rel. 16, and the Type 2 port selective CSI report in Rel. 17 may be considered as single-TRP CSI or single-panel CSI.

[0127] In each embodiment, X TRP, X-TRP, X panels, and Ng panels may be interchangeable. In each embodiment, CJT using X TRP, CJT using X panels, and X-TRP CJT may be interchangeable.

[0128] In each embodiment, the reference CSI, the CSI for the reference TRP, and the first reported CSI may be interchangeable. In each embodiment, the reference TRP, the CSI corresponding to the reference CSI, the TRP corresponding to the first reported CSI, and the CSI-RS resource / CMR / CMR group / CSI-RS resource set corresponding to the first reported CSI may be interchangeable. In each embodiment, the TRP, CSI-RS resource, CMR, CMR group, and CSI-RS resource set may be interchangeable.

[0129] In each embodiment, the terms multi-TRP, multi-panel, intra-site multi-TRP, and inter-site multi-TRP may be interchangeable.

[0130] In each embodiment, inter-TRP, inter-panel, inter-TRP difference, and inter-TRP comparison may be read interchangeably.

[0131] In each embodiment, inter-TRP CSI, inter-TRP CJT CSI, inter-panel CSI, CSI of another TRP relative to the CSI of the reference TRP, and CSI of another TRP relative to the CSI of the reference panel may be interchangeable. In each embodiment, per-TRP CSI and per-panel CSI may be interchangeable.

[0132] In various embodiments, an inter-TRP phase index and an inter-TRP phasing index may be interchangeable. In various embodiments, an inter-TRP index and an inter-TRP coefficient index may be interchangeable. In various embodiments, an inter-TRP phase matrix and an inter-TRP phasing matrix may be interchangeable. In various embodiments, an inter-TRP matrix and an inter-TRP coefficient matrix may be interchangeable. In various embodiments, an inter-TRP phase codebook and an inter-TRP phasing codebook may be interchangeable. In various embodiments, an inter-TRP codebook and an inter-TRP coefficient codebook may be interchangeable.

[0133] In each embodiment, the target resource, CMR, CSI-RS resource, NZP-CSI-RS resource, CMR group, CSI-RS resource set, NZP-CSI-RS resource set, and TRP may be interpreted as interchangeable.

[0134] In each embodiment, the inter-TRP codebook, the multi-panel codebook for the Type 2 codebook, and the inter-panel codebook may be interchangeable.

[0135] In each embodiment, the FD basis vector size, the number of FD bases, M v Size: M v , M v,i , may be read interchangeably.

[0136] In each embodiment, layer k and layer l may be interchangeable.

[0137] In each embodiment, the CSI reporting / content may apply to subband reporting or wideband reporting.

[0138] ((Embodiment #A)) <Embodiment #A1> This embodiment relates to a CMR.

[0139] If a new parameter indicating the codebook type is configured (e.g., codebookType=TypeII-CJT-r18 or TypeII-PortSelection-CJT-r18), a new CJT CSI feedback based on the existing Type II / Type II port selection may be configured. New UE capabilities for each new codebook type for CJT may be defined.

[0140] The CMR settings / instructions may follow any of the following options 1-1 to 1-3.

[0141] <<Option 1-1>> The number of TRPs (number of CJT CSIs) may be explicitly set as X, or may be implicitly indicated through the number of target resources (CMRs (CSI-RS resources) / CMR groups / CSI-RS resource sets) in the CSI reporting configuration (CSI-ReportConfig). A new UE capability for X may be specified. For example, X may be an integer up to 4, 2, 3, 4, or greater than 4.

[0142] In the CSI-ReportConfig for CJT CSI feedback, up to X target resources (CMRs (CSI-RS resources) / CMR groups / CSI-RS resource sets) may be configured for the first resource setting for channel measurement, and each target resource (CMRs (CSI-RS resources) / CMR groups / CSI-RS resource sets) may correspond to one TRP.

[0143] Preferably, X CSI-RS resources are used, and for X CMR groups / CSI-RS resource sets, an additional bitmap is needed to indicate combined CMRs from the X CMR groups / CSI-RS resource sets.

[0144] One CMR from the X CMRs may be measured and reported by the UE as the reference CSI. For example, the first CRI / CSI in the mapping order may be considered as the reference CSI. Other CMRs may be measured taking into account inter-TRP difference based on the reference CSI.

[0145] 12, X = 4. Four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured for four TRPs, respectively.

[0146] [Variations] Up to N*X CMRs may be configured to allow for the selection of different X-TRPs (X TRPs). Here, each of the X CMRs may correspond to a respective X TRP for CJT CSI. N combinations of X-TRPs may be measured and selected by the UE for CJT CSI. New UE capabilities for N may be specified. For example, N may be 1 or 2.

[0147] 13, N = 2 and X = 4. A combination of four CMRs (CSI-RS resources #1, #4, #5, #8) and another combination of four CMRs (CSI-RS resources #1, #4, #9, #11) are configured.

[0148] <<Option 1-2>> Up to X CSI reporting configurations (CSI-ReportConfigs) may be configured and associated with the CJT CSI. Here, each CSI-ReportConfig may correspond to one TRP. Up to N CMRs may be configured for each CSI-ReportConfig. For example, N may be 1 or 2 or more.

[0149] The CMR settings / instructions may follow either of the following options 1-2-1 and 1-2-2.

[0150] [Option 1-2-1] One of the X CSI-ReportConfigs may be set as a reference CSI-ReportConfig, and the other X-1 CSI-ReportConfigs may be associated with the reference CSI-ReportConfig.

[0151] In the example of Fig. 14, four CSI-Report Configs (#1, #2, #3, #4) are configured for four TRPs, respectively. CSI-Report Config #1 is configured as the reference CSI-Report Config, and CSI-Report Configs #2, #3, #4 are associated with CSI-Report Config #1.

[0152] [Option 1-2-2] One CMR from one of X CSI-ReportConfigs may be selected, and CSI based on it may be reported as reference CSI. Other CMRs from other CSI-ReportConfigs may be measured taking into account differences between TRPs based on the reference CSI. Within each CSI-ReportConfig, only one CMR may be configured for CJT CSI, and for each CSI-ReportConfig, a one-bit indicator of the reference CSI may be reported. The one-bit indicator may indicate whether the corresponding CSI is reference CSI.

[0153] In the above-mentioned Option 1-1, one CSI-ReportConfig may be associated with multiple TRPs. One CSI-RS (CSI-RS resource / CMR) may be associated with one TRP. In the above-mentioned Option 1-2, one CSI-ReportConfig may be associated with one TRP.

[0154] <<Options 1-3>> In the CSI report configuration (CSI-ReportConfig) for CJT CSI feedback, one or more N-port CSI-RS resources may be configured for CJT CSI measurement. Here, one or more ports from the N ports may correspond to one TRP. Some of the N ports may correspond to one TRP, and other ports may correspond to another TRP. N≧X may be possible.

[0155] For example, if one N-port CSI-RS resource is configured, the UE may measure all N ports and report one CSI. For example, the UE may measure all N ports, assuming that each port is transmitted by multiple TRPs. In this case, no CSI extension is required (TRPs are transparent to the UE), but a new QCL type for the CSI-RS resource may be required because the CSI-RS resource is transmitted by multiple TRPs instead of one TRP.

[0156] According to this embodiment, the UE can properly configure the CMR for CJT CSI feedback.

[0157] <Embodiment #A2> This embodiment relates to an IMR.

[0158] For CJT, it may be assumed that there is no inter-TRP interference. There may be only non-X TRP interference (interference from sources other than the X TRPs).

[0159] In the CSI report configuration (CSI-ReportConfig) for CJT CSI feedback, the same IMR (ZP CSI-RS resource) may be configured for the CMRs from the X TRPs, and interference other than the X TRPs may be measured based on the IMR.

[0160] The IMR settings / instructions may follow either of the following options 2-A and 2-B.

[0161] [Option 2-A] For X CMRs, only one IMR may be configured within the second resource setting. The UE may assume that all CMRs apply.

[0162] In the example of Figure 15A, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 described above. Furthermore, one IMR (ZP CSI-RS resource #2) is configured in the second resource setting for one CMR in the CSI-ReportConfig. The UE applies the one IMR to the four CMRs.

[0163] [Option 2-B] The one-to-one CMR-IMR mapping configuration framework is maintained, but the same IMR resource may be configured for each CMR in the second resource setting. The UE may assume that the same IMR resource is configured for each CMR in the second resource setting. It may correspond to a CMR in the first resource setting.

[0164] In the example of Figure 15B, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 described above. Furthermore, the same IMR (ZP CSI-RS resource #2) is configured in the second resource setting for each CMR in the CSI-ReportConfig. The UE applies the corresponding IMR to each CMR.

[0165] According to this embodiment, the UE can properly configure the IMR for CJT CSI feedback.

[0166] <Embodiment #A3> This embodiment relates to codebook / CSI.

[0167] In the above-mentioned option 1-1, if CMRs of X TRPs are configured in one CSI-ReportConfig, the CSI in one CSI report may follow any of the following options 3-A to 3-D.

[0168] Option 3-A: The CSI report may include at least one of the following CJT CSIs. The number of CJT CSIs may be less than four or more than five. The first CJT CSI may include the existing single TRP CSI and CRI for the first TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set. The second CJT CSI may include the existing single-TRP CSI and CRI for the second TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be based on a comparison with the first CJT CSI. The third CJT CSI may include the existing single-TRP CSI and CRI for the third TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be based on a comparison with the first CJT CSI.The fourth CJT CSI may include the existing single-TRP CSI and CRI for the fourth TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be based on a comparison with the first CJT CSI.

[0169] The i-th (i≧2) CJT CSI may include an index based on a comparison of the 1-th CJT CSI and the i-th CJT CSI.

[0170] The CRI index of the first CJT CSI may be selected by the UE from X CMRs and reported with a bit size of log2(X), which may be the reference CSI with the best channel condition.

[0171] Using this CSI, the base station can update the CJT CSI of 2-TRP, 3-TRP, and 4-TRP with the reference TRP for dynamic scheduling.

[0172] In the example of Figure 16, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 above. The CSI report includes the first to fourth CJT CSIs. The first CJT CSI includes a CRI based on CSI-RS resource #1 and a single-TRP CSI as the reference CSI. The second CJT CSI includes a CRI and single-TRP CSI based on CSI-RS resource #4 and an inter-TRP amplitude / phase index based on the reference CSI (the single-TRP CSI of CSI-RS resource #1). The third CJT CSI includes CRI and single-TRP CSI based on CSI-RS resource #5 and an amplitude / phase index between TRPs based on the reference CSI (single-TRP CSI of CSI-RS resource #1). The fourth CJT CSI includes CRI and single-TRP CSI based on CSI-RS resource #8 and an amplitude / phase index between TRPs based on the reference CSI (single-TRP CSI of CSI-RS resource #1).

[0173] 17 shows an example of a novel codebook for at least one of an inter-TRP phase index, an inter-TRP amplitude index, and an inter-TRP coefficient index (including both amplitude and phase). 3,1 denotes the inter-TRP phase index (compared to the reference CSI / TRP) as new CSI information for the CJT CSI. 3,2 indicates the inter-TRP amplitude index (compared to the reference CSI / TRP) as new CSI information for the CJT CSI. PMI index i3 indicates the inter-TRP coefficient index (compared to the reference CSI / TRP) as new CSI information for the CJT CSI.

[0174] Option 3-B: The CSI report may include at least one of the following CJT CSIs. The number of CJT CSIs may be less than four or more than five. The first CJT CSI may include the existing single TRP CSI and CRI for the first TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set. The second CJT CSI may include the existing single-TRP CSI and CRI for the second TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be based on a comparison with the first CJT CSI. The third CJT CSI may include the existing single-TRP CSI and CRI for the third TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be at least one of an index based on a comparison with the first CJT CSI and an index based on a comparison with the second CJT CSI.The fourth CJT CSI may include the existing single-TRP CSI and CRI for the fourth TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be at least one of an index based on a comparison with the first CJT CSI, an index based on a comparison with the second CJT CSI, and an index based on a comparison with the third CJT CSI.

[0175] The i-th (i≧2) CJT CSI may include an index based on a comparison of the 1st through the i-1th CJT CSIs.

[0176] The CRI index of the first CJT CSI may be selected by the UE from X CMRs and reported with a bit size of log2(X). The CRI index may be the reference CSI with the best channel condition. The CRI index of the second CJT CSI may be the second-best CSI. The CRI index of the third CJT CSI may be the third-best CSI. The CRI index of the fourth CJT CSI may be the fourth-best CSI.

[0177] Compared with Option 3-A, in Option 3-B, the base station can update any CJT CSI of 2-TRP, 3-TRP, or 4-TRP with the reference TRP for dynamic scheduling.

[0178] In the example of Figure 18, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 above. The CSI report includes the first to fourth CJT CSIs. The first CJT CSI includes a CRI based on CSI-RS resource #1 and a single-TRP CSI as the reference CSI. The second CJT CSI includes a CRI based on CSI-RS resource #4 and a single-TRP CSI, and an inter-TRP amplitude / phase index based on the reference CSI (the single-TRP CSI of CSI-RS resource #1). The third CJT CSI includes a CRI and single-TRP CSI based on CSI-RS resource #5, an inter-TRP amplitude / phase index based on the reference CSI (single-TRP CSI of CSI-RS resource #1), and an inter-TRP amplitude / phase index based on the single-TRP CSI of CSI-RS resource #4. The fourth CJT CSI includes a CRI and single-TRP CSI based on CSI-RS resource #8, an inter-TRP amplitude / phase index based on the reference CSI (single-TRP CSI of CSI-RS resource #1), an inter-TRP amplitude / phase index based on the single-TRP CSI of CSI-RS resource #4, and an inter-TRP amplitude / phase index based on the single-TRP CSI of CSI-RS resource #5.

[0179] 19 shows an example of a novel codebook for at least one of an inter-TRP phase index, an inter-TRP amplitude index, and an inter-TRP coefficient index (including both amplitude and phase). 3,1 denotes the inter-TRP phase index (compared to the reference CSI / TRP) as new CSI information for the CJT CSI. 3,2 denotes the inter-TRP amplitude index (compared to the reference CSI / TRP) as new CSI information for the CJT CSI. 3,3indicates the inter-TRP phase index (compared to the second reported CSI / TRP) as new CSI information for the CJT CSI. 3,4 denotes the TRP-to-TRP amplitude index (compared to the second reported CSI / TRP) as new CSI information for the CJT CSI. 3,5 indicates the inter-TRP phase index (compared to the third reported CSI / TRP) as new CSI information for the CJT CSI. 3,6 denotes the TRP-to-TRP amplitude index (compared to the third reported CSI / TRP) as new CSI information for the CJT CSI.

[0180] <<Option 3-C>> Based on the above Option 3-A / 3-B, at least one of the following additional contents may be reported for the second / third / fourth CJT contents. The number of CJT CSI may be less than four or more than five. The second CJT CSI may further include a CQI (2-TRP CQI) assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the second CJT CSI (CMR for the first CJT CSI and CMR for the second CJT CSI). The third CJT CSI may further include at least one of a CQI assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the third CJT CSI (a CMR for the first CJT CSI and a CMR for the third CJT CSI), and a CQI assuming a 3-TRP CJT of the CRI in the first CJT CSI, the CRI in the second CJT CSI and the CRI in the third CJT CSI (a CMR for the first CJT CSI, a CMR for the second CJT CSI and a CMR for the third CJT CSI) (a 3-TRP CQI). The fourth CJT CSI further includes a CQI assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the fourth CJT CSI (the CMR for the first CJT CSI, the CMR for the fourth CJT CSI, and the CMR for the second CJT CSI), and a CQI assuming a 4-TRP CJT of the CRI in the first CJT CSI, the CRI in the second CJT CSI, the CRI in the third CJT CSI, and the CRI in the fourth CJT CSI (the CMR for the first CJT CSI, the CMR for the second CJT CSI, the CMR for the third CJT CSI, and the CMR for the fourth CJT CSI). CQI).

[0181] The i-th (i≧2) CJT CSI may include CQI assuming the 1st through i-th i-TRP CJTs.

[0182] A new CQI (X-TRP CQI) report may be defined for at least one of a 2-TRP CJT (one TRP is the reference TRP / CSI), a 3-TRP CJT (one TRP is the reference TRP / CSI), and a 4-TRP CJT (one TRP is the reference TRP / CSI).

[0183] Whether or not a new X-TRP CQI is reported in the X-TRP CJT CSI may be configured in the RRC IE (CSI-ReportConfig).

[0184] [Variations] An additional new X-TRP CQI may not be reported, and instead, an existing single-TRP CQI may be reported in each CJT CSI. The X-TRP CJT may be a CJT that includes the CMR / TRP reported in the i-th CJT CSI. For example, a 4-TRP CJT may be a CJT that includes the CMR / TRP reported in the i-th CJT CSI.

[0185] In the example of Figure 20, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 above. The CSI report includes the first to fourth CJT CSIs. The first CJT CSI includes a CRI based on CSI-RS resource #1 and a single-TRP CSI as reference CSI. The second CJT CSI includes a CRI based on CSI-RS resource #4 and a single-TRP CSI, and the single-TRP CQI may be replaced with a 2-TRP CQI (based on CSI-RS resources #1 and #4). The third CJT CSI includes a CRI and single-TRP CSI based on CSI-RS resource #5, where the single-TRP CQI may be replaced with a 3-TRP CQI (based on CSI-RS resources #1, #4, and #5). The fourth CJT CSI includes a CRI and single-TRP CSI based on CSI-RS resource #8, where the single-TRP CQI may be replaced with a 4-TRP CQI (based on CSI-RS resources #1, #4, #5, and #8).

[0186] <<Option 3-D>> Based on the above Option 3-A / 3-B, at least one of the following additional contents may be reported for the second / third / fourth CJT contents. The number of CJT CSIs may be less than four or more than five. The i-th CJT CSI may be based on the i-1st CJT CSI as well as the i-1st CJT CSI. The second CJT CSI may further include a CQI (2-TRP CQI) assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the second CJT CSI (CMR for the first CJT CSI and CMR for the second CJT CSI). The third CJT CSI further includes a CQI assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the third CJT CSI (CMR for the first CJT CSI and CMR for the third CJT CSI), a CQI assuming a 2-TRP CJT of the CRI in the second CJT CSI and the CRI in the third CJT CSI (CMR for the second CJT CSI and CMR for the third CJT CSI), and a CQI assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the second CJT CSI and the CRI in the third CJT CSI (CMR for the first CJT CSI and CMR for the second CJT CSI and CMR for the third CJT CSI). and a CQI assuming a 3-TRP CJT (3-TRP CQI) for CSI (CMR for CSI).The fourth CJT CSI further includes the CQI assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the fourth CJT CSI (the CMR for the first CJT CSI, the CMR for the fourth CJT CSI, and the CMR for the second CJT CSI), the CQI assuming a 2-TRP CJT of the CRI in the second CJT CSI and the CRI in the fourth CJT CSI (the CMR for the second CJT CSI, the CMR for the fourth CJT CSI, and the CMR for the second CJT CSI), and the CRI in the third CJT CSI and the CRI in the fourth CJT CSI (the CMR for the third CJT CSI and the CMR for the fourth CJT CSI). CQI assuming 2-TRP CJT (CRI in the 1st CJT CSI, CRI in the 2nd CJT CSI, and CMR for the 2nd CJT CSI), and CQI assuming 3-TRP CJT (CRI in the 1st CJT CSI, CRI in the 2nd CJT CSI, and CMR for the 4th CJT CSI) and CQI assuming 3-TRP CJT (CRI in the 1st CJT CSI, CRI in the 3rd CJT CSI, and CRI in the 4th CJT CSI) and CQI assuming 3-TRP (CRI in the 1st CJT CSI, CRI in the 3rd CJT CSI, and CRI in the 4th CJT CSI) CQI assuming CJT, CRI in the second CJT CSI, CRI in the third CJT CSI, and CRI in the fourth CJT CSI (CMR for the second CJT CSI, CMR for the third CJT CSI, and CMR for the fourth CJT CSI), CQI assuming 3-TRP CJT, and CQI assuming 4-TRP CJT (4-TRP CJT), CRI in the first CJT CSI, CRI in the second CJT CSI, CRI in the third CJT CSI, and CMR for the fourth CJT CSI (CMR for the first CJT CSI, CMR for the second CJT CSI, CMR for the third CJT CSI, and CMR for the fourth CJT CSI), CQI).

[0187] The i-th (i≧2) CJT CSI may include a CQI assuming a j-th (2≦j≦i)-TRP CJT using at least two of the 1st to i-th CJTs.

[0188] A new CQI (X-TRP CQI) report may be defined for at least one of a 2-TRP CJT (with / without indicating two TRPs), a 3-TRP CJT (with / without indicating three TRPs), and a 4-TRP CJT.

[0189] In the example of Figure 21, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 above. The CSI report includes the first to fourth CJT CSIs. The first CJT CSI includes a CRI based on CSI-RS resource #1 and a single-TRP CSI as reference CSI. The second CJT CSI includes a CRI based on CSI-RS resource #4 and a single-TRP CSI and a 2-TRP CQI (based on CSI-RS resources #1 and #4). The third CJT CSI includes a CRI based on CSI-RS resource #5 and a single-TRP CSI and a 2-TRP CQI / 3-TRP CQI. The fourth CJT CSI includes CRI and single-TRP CSI based on CSI-RS resource #8, and 2-TRP CQI / 3-TRP CQI / 4-TRP CQI.

[0190] Whether or not a new X-TRP CQI is reported in the X-TRP CJT CSI may be configured in the RRC IE (CSI-ReportConfig).

[0191] In the above-mentioned Option 1-2, one CSI report may correspond to each CSI-ReportConfig for the X associated CSI-ReportConfigs. In this case, Option 3-A / 3-B / 3-C / 3-D may be applied with the following differences: The first / second / third / fourth CJT CSI content in Option 3-A / 3-B / 3-C / 3-D may be reported in separate CSI reports for the corresponding CSI-ReportConfigs. In this case, a CRI report may not be required in each CSI report. In each CSI report, a reference CSI indicator may be explicitly indicated along with one new CJT CSI content. The first CJT CSI content may be reported for a CSI report with reference CSI indicator = true / yes. For other CSI reports with reference CSI indicator = false / no, the content of the 2nd / 3rd / 4th CJT CSI may be reported.

[0192] According to this embodiment, the UE can properly report the CJT CSI.

[0193] <Embodiment #A4> This embodiment relates to codebook / CSI / quantization.

[0194] A new codebook table (quantization table) for new report content in embodiment #A3 may be defined.

[0195] For the inter-TRP amplitude codebook, a new table may be defined, or an existing table (e.g., the aforementioned 16-level quantization table / 8-level quantization table) may be reused. Figure 22 shows an example of a new table for the inter-TRP amplitude codebook. For example, when M = 3, two bits are used for the indication / reporting, and four values ​​can be indicated / reported. For example, when M = 4, three bits are used for the indication / reporting, and eight values ​​can be indicated / reported.

[0196] For the inter-TRP phase codebook, a new table may be defined, or an existing table (e.g., the aforementioned 16-level quantization table / 8-level quantization table) may be reused. Figure 23 shows an example of a new table for the inter-TRP phase codebook. For example, when P=4, two bits are used for the indication / reporting, and four values ​​can be indicated / reported. For example, when P=8, three bits are used for the indication / reporting, and eight values ​​can be indicated / reported. For the indication / reporting of phase, the range of [0, 2π) may be divided into P parts (φ l,i = exp(j2πc i / P), c i ∈{0,...,P-1}).

[0197] A new table may be defined for the inter-TRP coefficient codebook (inter-TRP codebook). Figure 24 shows an example of a new table for the inter-TRP coefficient codebook. Each value may include both amplitude and phase.

[0198] According to this embodiment, the UE can appropriately quantize the CJT CSI.

[0199] <Embodiment #A5> This embodiment relates to CSI Part 1 / 2 and the mapping order.

[0200] In the above Option 1-1, a separation between CSI Part 1 and CSI Part 2 may be specified for new CJT CSI reporting for one TRP for one CSI-ReportConfig.

[0201] The X-TRP CQI may be in either CSI Part 1 or CSI Part 2.

[0202] A new mapping order table of one or more CSI fields of one CSI report for CSI Part 1 and a new mapping order table of one or more CSI fields of one CSI report for CSI Part 2 may be defined. For example, the CRI may be at the beginning of Part 1. The inter-TRP coefficient (phase / amplitude) index may be at the end of Part 2.

[0203] The mapping order of one or more CSI fields in CSI Part 1 for CJT CSI for one TRP may follow: CRI (if reported) Reference CSI Indicator (if reported) Rank Indicator (RI) Channel Quality Indicator (CQI) (single-TRP CQI or X-TRP CQI based on configuration) Number of non-zero amplitude coefficients

[0204] This CSI Part 1 may have a fixed payload size.

[0205] The mapping order of one or more CSI fields in CSI Part 2 for CJT CSI for one TRP may be according to: an oversampling factor; a multiplicity index of the 2D-DFT basis (SD vector); an index M of the initial DFT basis (FD basis) for the selected DFT window. initial - Selected DFT basis (FD basis) per layer - Bitmap per layer - Non-zero LC coefficients (phase and amplitude) per layer - Strongest coefficient indicator per layer - Amplitude of strongest coefficient per layer / per polarization - Inter-TRP amplitude index per layer (per polarization) (if reported) - Inter-TRP phase index per layer (per polarization) (if reported) - Inter-TRP coefficient index per layer (per polarization) (if reported) - Additional X-TRP CQI (if reported) (may be in CSI Part 1)

[0206] The first / second / third / fourth CJT CSI content may be in one CSI report.

[0207] CSI reporting may follow either of options 5-1 and 5-2 below.

[0208] [Option 5-1] CSI Part 1 for each of the 1st / 2nd / 3rd / 4th CJT CSIs may include the content of the aforementioned "One CSI Part 1 for CJT CSI for one TRP." CSI Part 2 for each of the 1st / 2nd / 3rd / 4th CJT CSIs may include the content of the aforementioned "One CSI Part 2 for CJT CSI for one TRP."

[0209] Figure 25A shows an example of CSI Parts 1 and 2 for a 4-TRP CJT CSI. Following the above "One CSI Part 1 for CJT CSI for one TRP", CSI Part 1 for the first TRP (CJT CSI), CSI Part 1 for the second TRP (CJT CSI), CSI Part 1 for the third TRP (CJT CSI), and CSI Part 1 for the fourth TRP (CJT CSI) are reported. In accordance with the above "One CSI Part 2 for CJT CSI for one TRP", CSI Part 2 for the first TRP (CJT CSI), CSI Part 2 for the second TRP (CJT CSI), CSI Part 2 for the third TRP (CJT CSI), and CSI Part 2 for the fourth TRP (CJT CSI) are reported.

[0210] [Option 5-2] CSI Part 1 may include the content of the aforementioned "One CSI Part 1 for CJT CSI for one TRP" for the reference (first) CJT CSI. CSI Part 2 may include other content.

[0211] Figure 25B shows an example of CSI Parts 1 and 2 for a 4-TRP CJT CSI. CSI Part 1 for the first TRP (CJT CSI) is reported according to the above "One CSI Part 1 for CJT CSI for one TRP." CSI Part 2 for the first TRP (CJT CSI) is reported according to the above "One CSI Part 2 for CJT CSI for one TRP." In accordance with the above "One CSI Part 1 for CJT CSI for one TRP" and "One CSI Part 2 for CJT CSI for one TRP", CSI Parts 1 and 2 for the second TRP (CJT CSI), CSI Parts 1 and 2 for the third TRP (CJT CSI), and CSI Parts 1 and 2 for the fourth TRP (CJT CSI) are reported.

[0212] In a new mapping order table for one or more CSI fields of one CSI report for CSI Part 1 / 2, the CSI may be placed in the order of the TRP (first CJT CSI, second CJT CSI, third CJT CSI, fourth CJT CSI).

[0213] According to this embodiment, the UE can properly report the CJT CSI.

[0214] <Embodiment #A6> This embodiment relates to CSI Part 2.

[0215] For the above "one CSI Part 2 for CJT CSI for one TRP", the grouping of CSI Part 2 (based on the above groups 0 / 1 / 2) may follow either of the following options 6-1 and 6-2.

[0216] [Option 6-1] New indices for amplitude / phase / coefficients between TRPs may be placed in Group 2.

[0217] For example, the above group 2 may be changed as follows: Group 2: i 1,7,l The lowest (lowest) floor(K NZ / 2) priority elements, i 2,4,l The lowest (lowest) floor(KNZ / 2) priority elements, i 2,5,l The lowest (lowest) floor(K NZ / 2) priority elements (l=1,...,v), amplitude / phase / coefficient index between TRPs for each layer

[0218] [Option 6-2] A new Group 3 may be introduced. New indices for amplitude / phase / coefficients between TRPs may be placed in Group 3. In CSI omission, Group 3 may have a lower priority than Group 2.

[0219] For example, in addition to the above-mentioned groups 0 to 2, the following group 3 may be defined: Group 3: Amplitude / phase / coefficient index between TRPs for each layer

[0220] If the X-TRP CQI is in CSI Part 2, it may be placed in Group 0 or 1, which has a higher priority.

[0221] In the above Option 5-2 "CSI Parts 1 and 2 for 4-TRP CJT CSI," the original CSI Part 1 content for the CJT CSI for one TRP (2nd / 3rd / 4th CJT CSI) is in CSI Part 2. The original CSI Part 1 content may be placed in Group 0 in CSI Part 2.

[0222] If Group 3 is introduced, the priority reporting level for Part 2 CSI may be changed.

[0223] The relationship between the CSI Part 2 priority and the CSI Part 2 mapping order table may be as follows: Rep may be the number of CSI reports. Priority 0: CSI reports 1 to N RepPriority 1: Group 1 CSI for CSI report 1 if configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI of even-numbered subbands for CSI report 1 if configured as other Priority 2: Group 2 CSI for CSI report 1 if configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI of odd-numbered subbands for CSI report 1 if configured as other Priority 3: Group 3 CSI for CSI report 1 if configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI of odd-numbered subbands for CSI report 1 if configured as others. Priority 4: Group 1 CSI for CSI report 2 if configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI of even-numbered subbands for CSI report 1 if configured as others. Priority 5: Group 2 CSI for CSI report 2 if configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI of odd-numbered subbands for CSI report 1 if configured as others. Priority 6: Group 3 CSI for CSI report 2 if set to 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI of odd-numbered subbands for CSI report 1 if set to anything else. Priorities 7 and above may be specified according to the same rules as priorities 1 to 6.

[0224] In priorities 1 to 3, if set to 'xx-CJT-r18', the mapping order of CSI of groups 1 to 3 for CSI report 1 may follow either of the following mapping orders 1 and 2.

[0225] [Mapping Order 1] Group 1 CSI for CSI report 1 for TRP of CSI of the 1st CJT Group 1 CSI for CSI report 1 for TRP of CSI of the 2nd CJT Group 1 CSI for CSI report 1 for TRP of CSI of the 3rd CJT Group 1 CSI for CSI report 1 for TRP of CSI of the 4th CJT Group 2 CSI for CSI report 1 for TRP of CSI of the 1st CJT Group 2 CSI for CSI report 1 for TRP of CSI of the 2nd CJT Group 2 CSI for CSI report 1 for TRP of CSI of the 3rd CJT Group 2 CSI for CSI report 1 for TRP of CSI of the 4th CJT Group 3 CSI for CSI Report 1 for CSI TRP. Group 3 CSI for CSI Report 1 for 2nd CJT CSI TRP. Group 3 CSI for CSI Report 1 for 3rd CJT CSI TRP. Group 3 CSI for CSI Report 1 for 4th CJT CSI TRP.

[0226] [Mapping Order 2] Group 1 CSI for CSI report 1 for TRP of CSI of the first CJT Group 2 CSI for CSI report 1 for TRP of CSI of the first CJT Group 3 CSI for CSI report 1 for TRP of CSI of the first CJT Group 1 CSI for CSI report 1 for TRP of CSI of the second CJT Group 2 CSI for CSI report 1 for TRP of CSI of the second CJT Group 3 CSI for CSI report 1 for TRP of CSI of the second CJT Group 1 CSI for CSI report 1 for TRP of CSI of the third CJT Group 2 CSI for CSI report 1 for TRP of CSI of the third CJT Group 3 CSI for CSI report 1 for TRP of CSI of the third CJT Group 3 CSI for CSI Report 1 for CSI TRP. Group 1 CSI for CSI Report 1 for 4th CJT CSI TRP. Group 2 CSI for CSI Report 1 for 4th CJT CSI TRP. Group 3 CSI for CSI Report 1 for 4th CJT CSI TRP.

[0227] According to this embodiment, the UE can properly report the CJT CSI.

[0228] (Embodiment #B) <Embodiment #B1> If it is configured for CJT CSI that CSI per TRP is reported within one CSI report, one or more of the following constraints 1 to 3 may be taken into account for that CSI per TRP.

[0229] Constraint 1: The same RI is assumed for the CSI measurements for each TRP. Only a common RI report may be required. For example, an RI report may be included in the first CJT CSI, but not in the second / third / fourth CJT CSI. If the RI reports are different for the CSI for each TRP, it becomes difficult for the base station to update those RIs for the CJT CSI.

[0230] Constraint 2: At least one of common parameters and distinct parameters is set for each TRP. Here, each TRP, each CMR, each CMR group, and each CMR set may be read as interchangeable. The parameters may be represented by at least one of the following parameter fields: Supported parameter (codebook parameter) combinations (L, p v ,β,α,M) (paramCombination). A field indicating how PMI subbands are defined per CQI subband (numberOfPMI-SubbandsPerCQI-Subband). The number of beams L used in the linear combination (numberOfBeams). The size of the PSK alphabet, QPSK or 8-PSK (phaseAlphabetSize). A field that is true if subband amplitude reporting is activated (subbandAmplitude). The value of N (e.g., if M=2, then the parameter N∈{2,4} is set) (valueOfN).

[0231] In Rel. 15 / 16 / 17, these parameters are configured per codebook configuration (CodebookConfig) and per CSI reporting configuration (CSI-ReportConfig). In the CJT CSI configuration, some of these parameters may be configured per TRP. In that CJT CSI configuration, the CSI of the 2nd / 3rd / 4th TRP may have coarser feedback granularity and smaller overhead than the CSI of the 1st TRP. In the paramCombination, different (L,p v , β) may be set. For the CJT CSI setting, the paramCombination may be used to set some parameters common to the TRP (e.g., common L) and some parameters specific to the TRP (e.g., p v , β) may be set.

[0232] Figure 26A shows the W for the first TRP. ~and W for the second TRP ~ As shown in this example, different numbers of SD beams L (L1, L2) may be set for the CSI of the first TRP and the CSI of the second TRP.

[0233] Figure 26B shows the W for the first TRP. ~ and W for the second TRP ~ As shown in this example, the same number of SD beams L and a different maximum number of NZCs (β=½, ¼) for each layer may be set for each TRP.

[0234] Constraint 3: In a CSI-ReportConfig, at least one of the following settings 3a to 3d is introduced for all X TRPs (all CMRs / IMRs). [Setting 3a] The maximum number of non-zero coefficients (NZCs) for each layer of all X TRPs in the CSI-ReportConfig. [Setting 3b] The maximum number of NZCs for all layers of all X TRPs in the CSI-ReportConfig. [Setting 3c] The maximum number of SD beams for all X TRPs in the CSI-ReportConfig. [Setting 3d] The number of FD bases (FD basis vector size) M for all X TRPs in the CSI-ReportConfig. v The maximum number of.

[0235] UE capability signaling for at least one of constraints 1 to 3 may be introduced.

[0236] According to this embodiment, the UE can appropriately report CSI for each of the X TRPs in one CSI report based on the constraints / relationships.

[0237] <Embodiment #B2> If it is configured that CSI for each TRP is reported within one CSI report for CJT CSI, the measurement order / operations may follow at least one of the following operations 1 to 4.

[0238] <<Operation 1>> First, (assuming single-TRP reception) the best TRP / CRI / CSI (CSI of the first TRP, CSI of the first CJT) is selected. Next, assuming 2-TRP CJT reception, the CSI of the second TRP is measured based on the CSI of the first CJT. Next, assuming 3-TRP CJT reception, the CSI of the third TRP is measured based on the CSI of the first and second CJTs. Next, assuming 4-TRP CJT reception, the CSI of the fourth TRP is measured based on the CSI of the first, second, and third CJTs. In this case, the UE may assume different receive beamforming matrices when measuring the CSI of the second, third, and fourth TRPs.

[0239] Operation 2: First, the best TRP / CRI / CSI (CSI of the first TRP, CSI of the first CJT) is selected (assuming single-TRP reception). Next, assuming 2-TRP CJT reception, the CSI of the second TRP (and similarly the CSI of the third and fourth TRPs) is measured based on the CSI of the first CJT. In this case, the UE may assume the same receive beamforming matrix when measuring the CSI of the second, third, and fourth TRPs.

[0240] Operation 3: First, the best TRP / CRI / CSI (CSI of the first TRP, CSI of the first CJT) is selected (assuming single-TRP reception). Next, assuming 4-TRP CJT reception, CSI of the second, third, and fourth TRPs is measured based on the CSI of the first CJT. In this case, the UE may assume the same receive beamforming matrix when measuring the CSI of the second, third, and fourth TRPs.

[0241] Operation 4: Assuming 4-TRP CJT reception, the CSI of the first, second, third, and fourth TRPs is measured. In this case, the UE may assume the same receive beamforming matrix when measuring the CSI of the first, second, third, and fourth TRPs.

[0242] UE capability signaling for at least one of actions 1 to 4 may be introduced.

[0243] According to this embodiment, the UE can measure appropriately for reporting CSI for each of X TRPs in one CSI report.

[0244] <Embodiment #B3> For inter-TRP CSI / PMI (e.g., inter-TRP amplitude and inter-TRP phase, or inter-TRP phase only), the UE may follow at least one of the following reports 1 to 2.

[0245] <<Report 1>> An independent codebook and feedback for CSI / PMI between TRPs may be provided before (above) the existing Rel. 16 / 17 Type 2 codebook. The independent codebook and feedback may follow any of the codebooks and feedback in embodiment #A. The CSI / PMI between TRPs may follow at least one of the following Reports 1A to 1B.

[0246] [Report 1A] The size of the matrix W2 for inter-TRP CSI / PMI is 1x1. This may mean that inter-TRP PMI between two TRPs is taken into account. In this case, W2 may be common to multiple layers.

[0247] [Report 1B] The size of the matrix W2 for CSI / PMI between TRPs is N t ×N t , or K × K based on Rel. 17 Type 2 port selection CSI. This may mean that inter-TRP PMI between each antenna port from two TRPs is considered. In this case, W2 may be common to multiple layers.

[0248] The first CJT CSI for layer l of the first TRP (best TRP) may be expressed as: l,1 (N t ×N3) = W1W ~ k W f,k H (B1)

[0249] The first CJT CSI for layer l of the first TRP (best TRP) may be expressed as: W' l,i (Nt ×N3) = W 2,i W1W ~ k W f,k H (B2) W 2,i (1×1) or W 2,i (N t ×N t ), where i may be the index of the TRP / CMR / CMR group.

[0250] The base station uses W 2,i In this example, the base station updates the 4-TRP CJT CSI for layer l of TRP#i (i={2,3,4}) using the following formula: 2,i Using W' l,i may be updated.

[0251] 《Report 2》 The matrix W2 for CSI / PMI between TRPs is W ~ k W f,k H may be transmitted together with W ~ k W f,k H The CSI / PMI w2 between TRPs may be transmitted in accordance with at least one of the following reports 2a to 2b:

[0252] [Report 2a] For the 2nd / 3rd / 4th CJT CSI measurements, the FD basis and coefficients are based on a common M across multiple TRPs. v (The common FD basis W f,k ) from the setting / instructed common M v From the first CJT CSI, the coefficient W for their TRP is measured jointly. ~ k may be jointly selected and reported in the CSI per TRP. The coefficient reporting may follow at least one of reports 2a-1 to 2a-2 below.

[0253] [[Report 2a-1]] For per-TRP coefficient reporting, existing reports may be reused. That is, one strongest coefficient indicator (SCI) per TRP per layer may be reported. It may have amplitude = 1 and phase = 0 as a reference coefficient. Other coefficients per TRP per layer may be quantized based on that reference coefficient. The amplitude / phase difference between the strongest reference coefficient from the second / third / fourth TRP and the strongest reference coefficient from the first TRP may be additionally reported.

[0254] In the example of Figure 27, one SCI is reported per TRP per layer, and quantized per TRP, and amplitude / phase differences between the reference coefficients from the first TRP and the reference coefficients from the other TRPs may be additionally reported. In this example, the amplitude / phase of the SCI beam per TRP is not reported, but the amplitude / phase differences between the reference coefficients from the first TRP and the reference coefficients from the other TRPs are reported.

[0255] [[Report 2a-2]] For coefficient reporting across multiple (all) TRPs, one strongest coefficient indicator (SCI) per layer from all TRPs is reported in the first TRP CSI, and other coefficients per TRP and per layer may be quantized based on this strongest coefficient. The strongest coefficient may have amplitude = 1 and phase = 0 as a reference coefficient. Other coefficients per TRP and per layer may be quantized based on this reference coefficient. Therefore, in the second / third / fourth TRP CSI, there may be no SCI reporting per TRP CSI, and the amplitude / phase of the original SCI may be quantized and fed back based on the common SCI, just like other non-SCI beams. The original SCI per TRP may have amplitude = 1 and phase = 0 as a reference. Therefore, the amplitude / phase of the SCI per TRP may not be reported in Report 2a-1.

[0256] In the example of Figure 28, one SCI may be reported per layer across all TRPs and quantized across all TRPs. In this example, the original SCI is not reported in the 2nd / 3rd / 4th TRP CSI, but the amplitude / phase of the original SCI beam per TRP may be reported.

[0257] [Report 2b] For the second / third / fourth CJT CSI measurements, the FD basis and coefficients are jointly measured with the first CJT CSI from a set large FD basis. For each TRP, the main coefficients may be distributed within different FD bases for each TRP. In this case, a different M v,i At least one of the following may be reported: size and different starting offsets within the FD basis. The reporting may be layer-specific for each TRP or common to multiple layers for each TRP. The coefficient reporting may follow at least one of Reports 2b-1 to 2b-2 below.

[0258] [[Report 2b-1]] For per-TRP coefficient reporting, existing reports may be reused, i.e., per-TRP, per-layer, M v,i One strongest coefficient indicator (SCI) per TRP may be reported, which may have amplitude = 1 and phase = 0 as the reference coefficient. v,i The other coefficients for each TRP may be quantized based on their 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 may be additionally reported.

[0259] per TRP, per layer, M v,i For each TRP, one SCI may be reported and quantized per TRP.

[0260] In the example of FIG. 29, for TRP#i (i={1,2,3,4}), M v,i The UE may determine the starting offset of the number of FD bases to be selected. Among the configured FD bases, Mv,i Using FD bases, W f,k , W ~ k For TRP#i, the number of SD beams (SD DFT vectors) L may be determined. i For each TRP, SCI may be selected / reported from the selected FD basis and the configured SD beam.

[0261] [[Report 2b-2]] For coefficient reporting across multiple (all) TRPs, in the first TRP CSI, all M per layer from all TRPs are reported. v,i One strongest coefficient indicator (SCI) across all TRPs may be reported, and other coefficients per TRP and per layer may be quantized based on this strongest coefficient. The strongest coefficient may have amplitude = 1 and phase = 0 as a reference coefficient. Other coefficients per TRP and per layer may be quantized based on this reference coefficient. Therefore, within the second / third / fourth TRP CSI, there may be no SCI reporting per TRP CSI, and the amplitude / phase of the original SCI may be quantized and fed back based on the common SCI, just like other non-SCI beams. TRP-specific M v The reporting of coefficients for each TRP and the reporting of coefficients across multiple TRPs may be the same as in Report 2a-1 / 2a-2, except for the determination and reporting of coefficients.

[0262] For each TRP and layer, all M v,i One SCI report across all M v,i Quantization across the range may be performed.

[0263] M for each TRP v The size may be determined according to at least one of the following size determination methods 1 and 2. [Size determination method 1] M v The size may be configured by RRC. For each TRP, the UE v [Size Determination Method 2] The starting offset of each TRP M vThe maximum size of M for each TRP may be specified in the specification or may be set by the RRC. v The size may be determined.

[0264] Variation: M v,i may be discontinuous. Therefore, the discontinuous M v,i In order to notify each M v,i It may be necessary for the index of the FD basis for .times. ...

[0265] In Report 2, the inter-TRP PMI is W ~ k W f,k H may be transmitted together with W ~ k W f,k H Any of the inter-TRP CSIs in embodiment #A may be applied to the inter-TRP PMI.

[0266] Report 2b shows a smaller TRP-specific M compared to Report 2a. v can be used to reduce the feedback overhead.

[0267] The UE reports 2a (M common to multiple TRPs) v ) and Report 2b (TRP-specific M v ) may be supported. Report 2a and Report 2b may be switched based on the number of FD bases / subbands, etc.

[0268] According to this embodiment, the UE can properly report CSI / PMI between TRPs.

[0269] ((Embodiment #C)) <Embodiment #C1> This embodiment relates to setting of CSI / codebooks for multiple panels.

[0270] The UE supports a new multi-panel codebook, which may be called a Type-2 multi-panel codebook, may be based on the Type-1 multi-panel codebook, or may be an extension of the Type-2 codebook and Type-2 port selection codebook of Rel. 16 / 17.

[0271] The antenna configuration for the Type 2 multi-panel codebook may be in accordance with at least one of the following antenna configurations 1 and 2.

[0272] [Antenna setting 1] (n g ,n1,n2) configuration (ng-n1-n2) may be supported.

[0273] The maximum number of CSI-RS ports per CSI-RS resource may be equal to the existing maximum of 32. One CSI-RS resource with different ports corresponding to different TRPs / panels may be configured as a CMR for multi-TRP CJT CSI measurements. For example, N g =2 may mean X=2. For example, N g = 4 may mean X = 4. For example, if ng-n1-n2 indicate (4,2,2), the total number of CSI-RS ports may be 4*2*2*2=32.

[0274] [Antenna Configuration 2] In addition to the (n1,n2) configuration (n1-n2) supported for the existing Type 1 single panel codebook, g ={2,3,4} may be supported / set.

[0275] The maximum number of CSI-RS ports per CSI-RS resource may be equal to the existing maximum of 32. Multiple (X) CSI-RS resources with different ports corresponding to different TRPs / panels may be configured as a CMR for multi-TRP CJT CSI measurements. Each CSI-RS resource may have N1*N2*2 ports.

[0276] For example, N g =2 may mean X=2. For example, n1-n2 is (8,2) and Ng With N = 2, the total number of CSI-RS ports may be 2*8*2*2=64, and two CSI-RS resources may be configured, with 32 ports per CSI-RS resource (N * N * 2 can be up to 32. g *N1*N2*2 can be at most 32).

[0277] It may be possible to specify / switch between antenna settings 1 and 2. Antenna settings 1 and 2 may be applied to different cases (for example, different (n1, n2) cases).

[0278] (Rel. 16 / 17 Type 2 / Type 2 PS Codebook) UE capability signaling / reporting for Type 2 multi-panel codebook may be introduced.

[0279] Signaling / reporting of UE capabilities for Antenna Configuration 1 / Antenna Configuration 2 may be introduced.

[0280] According to this embodiment, the UE can appropriately configure the CSI for multi-panel.

[0281] <Embodiment #C2> This embodiment relates to a CSI / codebook for multiple panels.

[0282] When a Type 2 multi-panel codebook is configured, the UE may follow at least one of the following CSI 1 and 2. When a Type 2 multi-panel codebook is configured in addition to the Rel. 16 / 17 Type 2 / Type 2 PS codebook, the UE may follow at least one of the following inter-panel CSI reporting methods 1 and 2.

[0283] Inter-panel CSI reporting method 1: In addition to a new single-panel codebook, an additional N g - 1 precoding matrix W φ,i (Inter-panel CSI / Inter-TRP CSI, CJT CSI) may be reported. Each precoding matrix W φ,icorresponds to each panel / TRPi. The new single panel codebook may be called a Type 2 single panel codebook, or may be a Type 2 / Type 2 PS codebook in Rel. 16 / 17. Either inter-panel CSI / inter-TRP CSI in embodiments #A and #B may be obtained by using the precoding matrix W φ,i For example, CSI between panels / TRPs may be reported in CSI Part 2.

[0284] For example, N g The type-2 multi-panel CSI (precoding matrix for layer l) with =4 may be given by:

[0285] For layer l, v l is the precoding matrix for one polarization, and φv l is the precoding matrix for the other polarization, and φ may denote the phase matching between the two polarizations.

[0286] [Inter-panel CSI reporting method 2] In addition to the new single-panel codebook, an additional (N g -1)*2 precoding matrices W φ,i,j (Inter-polarization inter-panel CSI / inter-TRP CSI, CJT CSI) may be reported. Each precoding matrix W φ,i,j corresponds to the polarization j of each panel / TRP i. The new single-panel codebook may be called a Type 2 single-panel codebook, or may be a Type 2 / Type 2 PS codebook of Rel. 16 / 17. Either of the CSIs in embodiments #A and #B may be inter-panel CSI / inter-TRP CSI for each polarization, and the precoding matrix W φ,i,j ) The inter-panel CSI / inter-TRP CSI may be wideband or subband.

[0287] For example, N gThe type-2 multi-panel CSI (precoding matrix for layer l) with =4 may be given by:

[0288] Two codebook modes may be configured to specify / switch between inter-panel CSI reporting methods 1 (inter-polarization / panel / TRP CSI) and 2 (inter-panel / TRP CSI).

[0289] Signaling / reporting of UE capabilities for inter-panel CSI reporting method 1 / inter-panel CSI reporting method 2 may be introduced.

[0290] According to this embodiment, the UE can properly report CSI for multiple panels.

[0291] <Analysis> The 4-TRP CJT CSI in embodiments #A and #B can be expressed by the following equation:

[0292] Here, the 4-TRP CJT CSI in embodiments #A and #B has different W l,i Includes.

[0293] The difference between embodiment #C2 and embodiments #A and #B is that the per-TRP CSI in the Type 2 multi-panel CSI is common / identical for the four panels / TRPs. l,i In embodiment #C (inter-panel CSI reporting method 1), instead of l The overhead of CSI per TRP in embodiment #C2 is lower than the overhead of CSI per TRP in embodiments #A and #B.

[0294] <Embodiment #C3> This embodiment relates to a CSI / codebook for multiple panels.

[0295] TRP CSI W l On the other hand, W is common / identical across multiple TRPs. l It may be supported that the part of W is set / defined, and different W across multiple TRPs.l The UE may comply with at least one of the following common parts 1 to 5:

[0296] [Common part 1] W common across multiple TRPs l is not used (embodiment #A / #B).

[0297] [Common part 2] The SD beam matrix W1 is common / identical across multiple TRPs. The coupling coefficient matrix W ~ k and the FD basis matrix W f,k H is different across multiple TRPs (common W1, W for each TRP) ~ k and W f,k H ).

[0298] [Common part 3] SD beam matrix W1 and FD basis matrix W f,k H is common / identical across multiple TRPs. The coupling coefficient matrix W ~ k The parameters / quantities in the 4-TRP CJT CSI may be expressed by the following equation:

[0299] Here, the coupling coefficient matrix W for the panel / TRPi ~ k,i W1 and W2 may be different for each panel / TRP. f,k H , may be common / identical to multiple panels / TRPs.

[0300] [Common part 4] W common across multiple TRPs l is used (embodiment #C2).

[0301] [Common part 5] Multiple W for multiple TRPs l is used, and one W l corresponds to one or more multiple TRPs. For TRPs (panels) 1 to 4, the parameters / quantities in the 4-TRP CJT CSI may be expressed by the following equations:

[0302] Here, W common to TRP1 and 2 l is W l,1 W common to TRP3 and 4 l is W l,2 It may be represented by:

[0303] Signaling / reporting of UE capabilities for at least one of common parts 1 to 4, variations may be introduced.

[0304] Reported W l Whether a specific part of the CSI is common / identical across multiple TRPs or specific to each TRP may be reported by the UE as new CSI report content in CSI Part 1. The new CSI report content is used to determine the CSI content and CSI mapping order in CSI Part 2. The new CSI report content may include at least one of the following report contents 1 to 5.

[0305] [Report content 1] Information indicating that there is no common / identical CSI across multiple TRPs (CSI is reported for each TRP).

[0306] [Report content 2] Information indicating that the SD beam matrix is ​​common / identical across multiple TRPs (the coupling coefficient matrix and FD basis matrix are reported separately for each TRP).

[0307] [Report content 3] Information indicating that the SD beam matrix and FD basis matrix are common / identical across multiple TRPs (the coupling coefficient matrix is ​​reported separately for each TRP).

[0308] [Report Content 4] Common / same W for multiple panels / TRPs l Information indicating.

[0309] [Report Content 5] Information indicating one of Report Contents 1 to 4.

[0310] Signaling / reporting of UE capabilities for new CSI reporting content (at least one of reporting content 1 to 5) may be introduced.

[0311] According to this embodiment, the UE can properly report CSI for multiple panels.

[0312] <Embodiment #C4> This embodiment relates to the mapping order of CSI content for multi-panel / multi-TRP.

[0313] Embodiment #C3 is a CSI W common to multiple panels / TRPs. l (Embodiment #C2) and CSI W separate for panel / TRP l This can be said to be an intermediate method (overhead / accuracy) between (embodiment #A / #B) and (embodiment #C2 / #C3). CSI content common to multiple TRPs may be reported only once, in which case individual CSI configuration / reporting for each TRP (embodiment #A / #B) may be applied to embodiment #C2 / #C3.

[0314] If there is CSI content common to multiple TRPs and CSI content that differs for each TRP, a mapping order for CSI part 1 / 2 may be specified.

[0315] The mapping order for up to four TRP CJT CSIs is, for CSI part 1 / 2, the first TRP CJT CSI, then the second TRP CJT CSI, then the third TRP CJT CSI, then the fourth TRP CJT CSI.

[0316] As a mapping order for embodiments #C2 / #C3, for CSI Part 1 / 2, first, CSI content common to multiple TRPs in each CSI part may be mapped, and then individual CSI content for each TRP may be mapped in each CSI part. The individual CSI content for each TRP may follow the order of the first TRP CJT CSI, the second TRP CJT CSI, the third TRP CJT CSI, and the fourth TRP CJT CSI (similar to option 5-1 of embodiment #A). Figure 30 shows an example of the contents of CSI Parts 1 and 2 of the 4-TRP CSI CSI. In this example, the order of CSI content in CSI Part 1 for CJT CSI is: CSI content common to the four TRPs, CSI content specific to the first TRP, CSI content specific to the second TRP, CSI content specific to the third TRP, and CSI content specific to the fourth TRP. Similarly, the order of CSI content in CSI Part 2 for CJT CSI is: CSI content common to the four TRPs, CSI content specific to the first TRP, CSI content specific to the second TRP, CSI content specific to the third TRP, and CSI content specific to the fourth TRP.

[0317] According to this embodiment, the UE can properly report CSI for multiple panels.

[0318] <Supplementary Note> At least one of the above-described embodiments may be applied only to UEs that have reported or support a specific UE capability.

[0319] The specific UE capabilities may indicate at least one of the following: - Supporting specific processing / operation / control / information for at least one of the above embodiments. - Supporting reporting of inter-TRP amplitude. Supporting one or more multiple codebooks with different quantization granularity. - Supporting reporting of inter-TRP phase. Supporting one or more multiple codebooks with different quantization granularity. - Supporting reporting of inter-TRP coefficients (including both amplitude and phase). Supporting one or more multiple codebooks with different quantization granularity. - Supporting reporting of reference CSI indicator. - Supporting reporting of X-TRP CQI (aggregated CJT CQI). Supporting reporting of X-TRP CQI instead of single-TRP CQI. Supporting reporting of X-TRP CQI in addition to single-TRP CQI. Supporting reporting of X-TRP indications such as X-TRP CQI.・For CJT CSI, common M for multiple TRPs v Supports or M specific to TRP v ・Do you support the same M for CJT CSI? v Support different M sizes for CJT CSI. v Support size. For CJT CSI, support starting offset per TRP report. For CJT CSI, support continuous M v Supports discontinuous M v For CJT CSI, for each TRP, layer-specific M v Support for CJT CSI. For each TRP, M common to multiple layers v Supports the following: - Value of X in X-TRP CJT. - Maximum value of X in X-TRP CJT.

[0320] Furthermore, the specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., cell, band, BWP), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)).

[0321] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0322] Furthermore, at least one of the above-described embodiments may be applied when the UE is configured with specific information related to the above-described embodiments by higher layer signaling, such as information indicating that ... is enabled, any RRC parameter for a specific release (e.g., Rel. 18), etc.

[0323] If the UE does not support at least one of the specific UE capabilities or is not configured with the specific information, the UE may apply, for example, Rel. 15 / 16 behavior.

[0324] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal having: a controller that determines channel state information (CSI) based on a plurality of measurements corresponding to a plurality of panels used for coherent joint transmission; and a transmitter that transmits a CSI report including the CSI. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the controller determines the CSI based on either a multi-panel codebook setting or the number of the plurality of panels and a single-panel codebook setting. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the CSI includes a first parameter of a codebook using combining coefficients and a second parameter indicating a phase relationship between panels. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the CSI includes a third parameter common to the plurality of panels and a fourth parameter specific to each of the plurality of panels.

[0325] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0326] 31 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) specified by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0327] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0328] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0329] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0330] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0331] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0332] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0333] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0334] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0335] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may 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.

[0336] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0337] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0338] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0339] In the wireless communication system 1, 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)), etc. may be used as the downlink channel.

[0340] Furthermore, 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)), or the like may be used as an uplink channel.

[0341] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0342] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0343] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0344] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0345] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0346] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0347] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0348] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0349] 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 an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0350] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0351] 32 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0352] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0353] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0354] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0355] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0356] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0357] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0358] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0359] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0360] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0361] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0362] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0363] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0364] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0365] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0366] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0367] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0368] The transceiver unit 120 may transmit a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission, and the controller 110 may control reception of measurement reports for the X channel measurement resources based on the configuration.

[0369] The transceiver 120 may transmit a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission, and the controller 110 may control, based on the configuration, reception of a channel state information (CSI) report including X pieces of CSI corresponding to the X channel measurement resources.

[0370] The transceiver 120 may transmit a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission, and the controller 110 may control reception of Channel State Information (CSI) Part 1 and CSI Part 2 reports based on the configuration.

[0371] The transceiver 120 may transmit a single CSI report configuration including multiple pieces of channel state information (CSI) corresponding to multiple transmission and reception points for coherent joint transmission, and the controller 110 may control reception of the single CSI report.

[0372] The transceiver 120 may transmit a channel state information (CSI) report configuration including CSI between multiple transmitting and receiving points for coherent joint transmission. The controller 110 may control reception of the CSI report.

[0373] The transceiver 120 may transmit a channel state information (CSI) reference signal (RS) using multiple panels used for coherent joint transmission, and the controller 110 may control reception of a CSI report including CSI based on multiple measurements corresponding to the multiple panels, respectively.

[0374] (User terminal) Fig. 33 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0375] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0376] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0377] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0378] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0379] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0380] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0381] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0382] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0383] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0384] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0385] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0386] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0387] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0388] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0389] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0390] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0391] The transceiver unit 220 may receive a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission, and the controller 210 may control reporting of measurements on the X channel measurement resources based on the configuration.

[0392] The configuration may indicate at least one of X and X channel state information reporting configurations.

[0393] The configuration may indicate a plurality of channel state information reference signal ports.

[0394] The configuration may indicate 1 or X interference measurement resources.

[0395] The transceiver 220 may receive a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission, and the controller 210 may control a CSI report including X channel state information (CSI) corresponding to the X channel measurement resources based on the configuration.

[0396] Each of the X CSIs may include a channel state information reference signal (CSI-RS) resource indicator (CRI) indicating a corresponding channel measurement resource, and CSI based on the corresponding channel measurement resource.

[0397] Each of the X CSIs may include an index indicating at least one difference in phase and amplitude between multiple TRPs.

[0398] i may be 2 or greater, and the i-th CSI may include an index indicating a difference in at least one of phase and amplitude between at least two of the 1st to i-1th channel measurement resources.

[0399] The transceiver unit 220 may receive a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission, and the controller 210 may control reporting of channel state information (CSI) Part 1 and CSI Part 2 based on the configuration.

[0400] CSI Part 1 for one of the X TRPs may include at least one of a Channel State Information Reference Signal (CSI-RS) Resource Indicator (CRI) indicating a corresponding channel measurement resource and a Reference CSI Indicator indicating one of the X channel measurement resources.

[0401] CSI Part 2 for one of the X TRPs may include at least one of an index indicating at least one difference in phase and amplitude between multiple TRPs for at least one of layer and polarization, and a channel quality indicator (CQI) based on the X TRPs.

[0402] The index may be included in group 2 of groups 0 to 2, or in group 3 after group 2.

[0403] The controller 210 may determine a plurality of pieces of channel state information (CSI) corresponding to a plurality of transmission and reception points for coherent joint transmission, respectively, and the transceiver 220 may transmit a single CSI report including the plurality of pieces of CSI.

[0404] The plurality of CSIs may be based on at least one constraint of a rank indicator (RI), parameters for the plurality of CSIs, a maximum number of non-zero coefficients, a maximum number of spatial domain beams, and a maximum number of spatial domain vector sizes.

[0405] The terminal according to claim 1 or 2, wherein the control unit 210 selects a best result from measurement results corresponding to one of the plurality of transmission / reception points, and determines the plurality of CSIs based on the best result.

[0406] The controller 210 may determine the plurality of CSIs assuming coherent joint transmission using the plurality of transmission and reception points.

[0407] The controller 210 may cause the transceiver 220 to determine channel state information (CSI) between multiple transmission and reception points for coherent joint transmission. The transceiver 220 may transmit a CSI report including the CSI.

[0408] The CSI report may include CSI corresponding to one transmission / reception point among a plurality of transmission / reception points.

[0409] The controller 210 may select a plurality of best measurement results corresponding to each of the plurality of transmission and reception points, and determine the CSI based on the plurality of best measurement results.

[0410] The controller 210 may select a best measurement result corresponding to one of the plurality of transmission / reception points and determine the CSI based on the best measurement result.

[0411] The controller 210 may determine channel state information (CSI) based on a plurality of measurements corresponding to a plurality of panels used for coherent joint transmission, and the transceiver 220 may transmit a CSI report including the CSI.

[0412] The control unit 210 may determine the CSI based on either a multi-panel codebook setting or the number of the plurality of panels and a single-panel codebook setting.

[0413] The CSI may include a first parameter of a codebook using coupling coefficients and a second parameter indicating a phase relationship between panels.

[0414] The CSI may include a third parameter common to the plurality of panels and a fourth parameter specific to each of the plurality of panels.

[0415] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0416] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0417] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 34 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0418] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0419] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0420] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0421] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0422] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0423] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0424] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0425] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0426] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0427] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0428] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0429] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0430] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0431] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0432] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0433] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0434] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0435] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0436] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0437] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a 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.

[0438] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0439] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0440] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0441] 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 in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0442] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0443] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0444] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0445] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0446] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0447] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0448] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0449] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0450] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0451] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0452] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0453] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0454] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0455] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0456] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0457] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0458] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0459] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0460] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0461] 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," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0462] In the present disclosure, terms such as "base station (BS)," "radio 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," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0463] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0464] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0465] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0466] A mobile station may also be 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, handset, user agent, mobile client, client, or some other suitable terminology.

[0467] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0468] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0469] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0470] 35 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, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM 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.

[0471] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0472] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0473] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation 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 the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the 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.

[0474] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0475] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0476] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0477] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0478] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0479] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0480] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0481] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0482] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0483] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0484] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0485] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0486] Each aspect / embodiment described in the present disclosure may be a technology other than 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 decimal number)), 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 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0487] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0488] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0489] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0490] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0491] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0492] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0493] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0494] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0495] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0496] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0497] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0498] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0499] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0500] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0501] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A control unit that determines channel status information (CSI) based on multiple measurements corresponding to multiple transmit / receive points (TRPs) used in coherent joint transmission, It has a transmission unit that transmits a CSI report including the CSI, The CSI is a terminal that includes the phase difference between the plurality of TRPs.

2. The terminal according to claim 1, wherein the control unit controls the CSI report to include information about the reference CSI.

3. The terminal according to claim 1, wherein the transmitting unit reports the ability to support reporting of the phase difference between the plurality of TRPs.

4. The steps include determining channel status information (CSI) based on multiple measurements corresponding to multiple transmit / receive points (TRPs) used in coherent joint transmission, The step of transmitting a CSI report including the CSI, The CSI is a wireless communication method for a terminal, which includes the phase difference between the plurality of TRPs.

5. A transmitting unit that transmits settings for multiple channel status information reference signal (CSI-RS) resources corresponding to multiple transmit / receive points (TRPs) used in coherent joint transmission, The system includes a control unit that controls the reception of a CSI report, which includes a CSI based on a plurality of measurements based on the plurality of CSI-RS resources, The CSI includes the phase difference between the multiple TRPs, and is a base station.

6. A system having a terminal and a base station, The terminal includes a control unit that determines channel status information (CSI) based on multiple measurements corresponding to multiple transmission / reception points (TRPs) used in coherent joint transmission, It has a transmission unit that transmits a CSI report including the CSI, The base station includes a transmitting unit that transmits to the terminal the settings of a plurality of CSI reference signal (CSI-RS) resources corresponding to each of the plurality of TRPs, The system includes a control unit that controls the reception of the CSI report based on the plurality of CSI-RS resources, The CSI is a system that includes the phase difference between the multiple TRPs.