Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives setting of a report of channel state information (CSI) for a plurality of transmission points; and a control unit that, in accordance with transmission points, layers, indicators in the CSI, and / or the number of the plurality of transmission points, determines the positions and bit widths for the plurality of indicators in the CSI.

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 (registered trademark)) 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, the CSI / codebook for CJT has not been fully studied. Unless such a method is clearly defined, there is a risk that communication throughput and communication quality may be degraded.

[0007] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that determine an appropriate CSI / codebook for CJT.

[0008] A terminal according to one aspect of the present disclosure includes a receiving unit that receives channel state information (CSI) reporting configuration for a plurality of transmission points, and a control unit that determines positions and bit widths for a plurality of indicators in the CSI according to at least one of a transmission point, a layer, an indicator in the CSI, and the number of the plurality of transmission points.

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

[0010] Figure 1 shows an example of a 16-level quantization table. Figure 2 shows an example of an 8-level quantization table. Figure 3 shows an example of the bit width of the information field X1 of the PMI of the extended type 2 codebook. Figure 4 shows an example of the bit width of the information field X2 of the PMI of the extended type 2 codebook. Figure 5 shows an example of a mapping order of CSI fields of CSI Part 1 of one CSI report in the UCI on the PUCCH. Figure 6 shows an example of a mapping order of CSI fields of CSI Part 1 of one CSI report in the UCI on the PUSCH. Figure 7 shows an example of a mapping order of CSI fields of CSI Part 2 of one CSI report in the UCI on the PUSCH. Figures 8A and 8B show an example of an extended type 2 port selection codebook. Figures 9A and 9B show an example of an extended type 2 port selection codebook. Figures 10A and 10B show an example of a CMR pair for NCJT CSI. Figures 11A to 11C show an example of a mapping order of multiple fields in one CSI report for NCJT CSI. Figure 12 shows an example of modifying CSI Part 1 on the PUCCH according to embodiment #1. Figure 13 shows another example of modifying CSI Part 1 on the PUCCH according to embodiment #1. Figure 14 shows an example of modifying CSI Part 1 on the PUSCH according to embodiment #1. Figure 15 shows another example of modifying CSI Part 1 on the PUSCH according to embodiment #1. Figure 16 shows an example of the bit width of Option 1 of Type 2 CJT CSI according to embodiment #2. Figure 17 shows an example of the bit width of Option 2a of Type 2 CJT CSI according to embodiment #2. Figure 18 shows another example of the bit width of Option 2a of Type 2 CJT CSI according to embodiment #2. Figure 19 shows yet another example of the bit width of Option 2a of Type 2 CJT CSI according to embodiment #2. Figure 20 shows an example of a change to Option 2b of Type-2 CJT CSI according to embodiment #2. Figure 21 shows an example of a bit width of a multiple PMI field X2 according to embodiment #2. Figure 22 shows an example of a change to CSI Part 2 according to embodiment #2. Figure 23 shows another example of a change to CSI Part 2 according to embodiment #2. Figure 24 shows an example of a new report content bit width in a multiple PMI field X2 according to embodiment #3.Fig. 25 shows an example of a change in CSI Part 1 on a PUSCH according to embodiment #3. Fig. 26 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. Fig. 27 is a diagram showing an example of a configuration of a base station according to an embodiment. Fig. 28 is a diagram showing an example of a configuration of a user terminal according to an embodiment. Fig. 29 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. Fig. 30 is a diagram showing an example of a vehicle according to an embodiment.

[0011] (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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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).

[0017] 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."

[0018] 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.

[0019] 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.

[0020] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0021] (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)).

[0022] 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.

[0023] 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).

[0024] 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.

[0025] 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.

[0026] 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)

[0027] 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.

[0028] 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.).

[0029] 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).

[0030] 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.

[0031] 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).

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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).

[0036] 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 (MU-MIMO), while Type 2 CSI may assume multi-user MIMO.

[0037] 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.

[0038] 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.

[0039] 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.

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

[0041] 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.

[0042] 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).

[0043] 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.

[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 a plurality of codebooks including 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 a parameter (Restriction) 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] (Type 1 Codebook) As the Type 1 codebook (Rel. 15), 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. 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.

[0055] 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 ,i 1,3 ].

[0056] 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:

[0057] 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.

[0058] Number of CSI antenna ports P CSI-RS Supported (N gThe 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. i 1,1 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.

[0059] N g =W_l,m,p,n^1,N for {2,4} g ,1 and W_l,m,p,n^2,N g ,1 (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:

[0060] 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.

[0061] (Type 2 Codebook) In this disclosure, a matrix Z with X rows and Y columns may be expressed as Z(X×Y).

[0062] 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)

[0063] 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 a matrix (LC coefficient matrix) consisting of linear combination coefficients (LC coefficients, subband complex LC coefficients, and combination coefficients) for layer k. 2,k represents the beam selection and co-phasing between the two polarizations. For example, 2,k are c i ,c jFor 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.

[0064] In Type-2 CSI, the channel (channel matrix) for a user is represented by a linear combination of two polarizations and L beams (L 2D-DFT vectors). Type-2 CSI in Rel. 15 supports ranks 1 and 2.

[0065] (Type 2 Codebook Extension) Type 2 CSI (enhanced Type 2 codebook) in Rel. 16 uses frequency domain (FD) compression to 2,k Rel. 16 Type 2 CSI supports ranks 3 and 4 in addition to ranks 1 and 2.

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

[0067] W 2,k is W ~ k W f,k H It is approximated by the matrix W ~ may be expressed as a W with a tilde (~). ~ k is W ~ 2,k The matrix W f,k H is W f,k is the adjoint matrix of

[0068] For CSI reporting, the UE may be configured with one of two subband sizes: N PRB 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.

[0069] 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.

[0070] W ~ k (2L×M v ) is a matrix of LC coefficients. For this matrix, up to K0 non-zero coefficients (NZCs, LC coefficients with non-zero amplitude) are reported. The report consists of two parts: a bitmap capturing the NZC positions and the quantized NZCs.

[0071] W f,k (N3×M v ) is a matrix consisting of multiple frequency domain (FD) bases (vectors) for layer k. For each layer, M v There are FD bases (FD DFT bases). If N3 > 19, there are Mv DFTs 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 FD beam may correspond to a delay profile (time response).

[0072] A subset of the FD basis is {f1,...,f M_v} where f i is the i-th FD basis for the k-th layer (K=1,...,v), where 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.

[0073] 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 LC coefficient d1 0 ,d2 0 and the frequency response associated with the SD beam b0 is given by d1 0f2+,d2 0 f q is approximated by

[0074] 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 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.

[0075] W ~ k Each reported LC coefficient (complex coefficient) in is represented by a separately quantized amplitude and phase. Amplitude Quantization: The polarization-specific reference amplitudes are given in the table of FIG. 1 (amplitude coefficient indicator i 2,3,l Mapping multiple elements of: element k l,p (1) to amplitude coefficient p l,p (1) All other coefficients are mapped to the amplitude coefficient indicator i 2,4,l Mapping multiple elements of: element k l,i,f (2) to amplitude coefficient p l,i,f (2) Phase quantization: All coefficients are quantized using 16-PSK. For example, φ l,i = exp(j2πc l,i / 16), cl,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

[0076] 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 (the UCI size depends on the number of 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.

[0077] In enhanced Type-2 CSI feedback, CSI Part 1 includes RI, CQI, and an indication of the total number of non-zero amplitudes (NZC) 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 NZC (amplitude and phase) for each layer, the strongest coefficient indicator (SCI) for each layer, and the amplitude of the strongest coefficient for each layer / polarization.

[0078] 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 Minitial ・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

[0079] 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.

[0080] 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)

[0081] 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.

[0082] The PMI of the extended type 2 codebook is represented by information fields X1 and X2. 1,1 , i 1,2 , i 1,8,1 , i 1,8,2 , i 1,8,3 , i 1,8,4 The bit width of , is given by Fig. 3. 1,1 , i 1,2 is the index of the SD basis. 1,8,1 , i 1,8,2 , i 1,8,3 , i 1,8,4 is the index of SCI for each layer. 2,3,1 , i 2,3,2 , i 2,3,3 , i 2,3,4 , i 1,5 , i 1,6,1 , i 1,6,2 , i 1,6,3 , i 1,6,4 , {i 2,4,l} l=1...v , {i 2,5,l} l=1...v , {i 2,7,l} l=1...v The bit width of , is given by Fig. 4. 2,3,1 , i 2,3,2 , i 2,3,3 , i 2,3,4 is the amplitude of the SCI for each layer.1,5 is the window of the FD basis. 1,6,1 , i 1,6,2 , i 1,6,3 , i 1,6,4 is the selected FD basis for each layer. 2,4,l} l=1...v are the amplitudes of other (non-SCI) coefficients per layer. 2,5,l} l=1...v is the phase of the other (non-SCI) coefficients per layer. 2,7,l} l=1...v is the bitmap for NZC.

[0083] FIG. 5 shows an example of a mapping order of CSI fields in CSI Part 1 of one CSI report #n for pmi-FormatIndicator=subbandPMI or cqi-FormatIndicator=subbandCQI in UCI on the PUCCH.

[0084] 6 shows an example of a mapping order of CSI fields for CSI Part 1 of one CSI report #n in UCI on PUSCH, which differs from the mapping order of CSI Part 1 on PUCCH in that it includes an indicator of the total number of NZCs summed across all layers.

[0085] 7 shows an example of a mapping order of CSI fields in CSI Part 2 of one CSI report #n of codebookType=typeII-r16 or typeII-PortSelection-r16 in UCI on PUSCH. The order of each index included in the multiple PMI field X1 and the multiple PMI field X2 is determined by the bit width table described above.

[0086] (Extended and Further Extendable Type-2 Port Selection Codebook) In Rel. 15 Type-2 port selection (PS) CSI (Type-2 PS codebook), the UE does not need to derive SD beams by considering 2D-DFT as in Type-2 CSI. The base station transmits CSI-RS using K CSI-RS ports beamformed by considering a set of SD beams. The UE selects / identifies the best L (≦K) CSI-RS ports for each polarization and reports their indices in W1. Rel. 15 Type-2 PS CSI supports ranks 1 and 2.

[0087] The operation of Rel. 16 Type-2 PS CSI (enhanced Type-2 PS codebook) is similar to Rel. 16 Type-2 CSI, except for SD beam selection. Rel. 15 Type-2 PS CSI supports ranks 1 to 4.

[0088] 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)

[0089] 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}.

[0090] In the Type 2PS CSI of Rel. 15 / 16, each CSI-RS port #i has an SD beam (b i ) (Figures 8A and 8B).

[0091] Rel. 16 Type 2 PS CSI, like Rel. 16 Type 2 CSI, increases the number of FD bases from N3 to M v By reducing it to (M v <<N3>>, which reduces overhead compared to Rel. 15 Type 2 PS CSI.

[0092] In the Rel. 17 Type 2 port selection CSI / codebook (further enhanced Type 2 port selection codebook), each CSI-RS port #i is assigned to 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.

[0093] 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.

[0094] The main scenario for the Type 2 port selection codebook in Rel. 17 is FDD. Channel reciprocity based on SRS measurements is not perfect (the angles of the UL beam and DL beam may be different, the UL frequency and DL frequency are different in FDD, and the effective antenna spacing at the UL frequency and DL frequency is different). However, the base station can obtain / select some partial information (dominant angle and delay (SD beam and FD beam)). By using SRS measurements at the base station in addition to CSI reports, the base station can obtain CSI for determining the DL MIMO precoder. In this case, some CSI reports may be omitted to reduce CSI overhead.

[0095] 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.

[0096] 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)

[0097] 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. In the Rel. 16 Type-2 PS codebook, each port is associated with an SD beam. In contrast, in the Rel. 16 Type-2 PS codebook, 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.

[0098] W ~ k (2L×M v) is a matrix consisting of LC coefficient (subband complex LC coefficient) vectors for layer k. Up to K0 NZCs are reported. The report consists of two parts: a bitmap capturing the NZC positions and the quantized NZCs. In Rel. 16 Type-2 PS codebooks, the bitmap of NZC positions is always reported. In contrast, in Rel. 17 Type-2 PS codebooks, the bitmap can be omitted in certain cases. The certain case is when the number of reported NZCs is equal to the maximum number K1*M*v (v≦2).

[0099] W f,k (N3×M v ) for layer k, M v is a matrix consisting of FD basis (FD DFT basis) vectors. M v is 1 or 2. The base station f,k You can decide whether to use W or not. f,k is on (M v = 2), then M v additional FD bases are reported. f,k is off (M v =1, W f,k is off and M v =1 and W f,k is on), no additional FD basis is reported. v = 2, the RRC configured window size N (N is 2 or 4) to M v FD bases are selected / reported. In Rel. 16, W f,k is always reported.

[0100] (Rel. 17 NCJT CSI) joint transmission (JT) may refer to simultaneous data transmission from multiple points (e.g., TRPs) to a single UE.

[0101] 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.

[0102] The applicable scenario is a single DCI-based MTRP NCJT with a Type 1 single-panel codebook. For NCJT CSI measurements, two channel measurement resource (CMR) groups, each with a CMR from one TRP, can be configured within a single CSI-ReportConfig. One CSI reporting mode can be configured from two modes.

[0103] Through RRC signaling, the CSI-ReportConfig for Rel. 17 non-coherent joint transmission (NCJT) CSI configures the CMR and the CSI reporting mode (csi-ReportMode).

[0104] K s Two CMR groups with K = K1 + K2 CMRs are configured in the UE. s ≦8. K s The CMRs correspond to NZP-CSI-RS resource sets for channel measurement. K1 and K2 are the numbers of CMRs in the two CMR groups, respectively. N CMR pairs (N sets) are configured by higher layers by selecting from all possible pairs. N=1, K s =2 is supported. max Support for K = 2 is an optional feature for the UE. S,max=X support is an optional feature for the UE. Each CMR can contain up to 32 CSI-RS ports, depending on the UE capabilities. Each CMR pair is associated with one CRI value.

[0105] As shown in the example of Figure 10A, the bitmap signaled by RRC indicates N (N = 1, 2) CMR pairs actually used for NCJT measurement by indicating one CMR from each CMR group. As shown in the example of Figure 10B, the UE measures single-TRP CSI for TRP1 and single-TRP CSI for TRP2 using CMRs in two CMR groups, and measures NCJT CSI using N CMR pairs.

[0106] The UE selects one or more CSIs to report based on the mode set by csi-ReportMode, which indicates one of the following two modes: Mode 1 and Mode 2.

[0107] At least one of the following Modes 1 and 2 is supported: [Mode 1] The UE may be configured to report X CSIs associated with single-TRP measurement hypotheses and one CSI associated with the NCJT measurement hypothesis, where X=0, 1, 2. If X=2, two CSIs are associated with two different single-TRP measurement hypotheses with CMRs from different CMR groups. Support for X=1, 2 is an optional UE feature for UEs that support Option 1. [Mode 2] The UE is configured to report one CSI associated with the best one of the NCJT and single-TRP measurement hypotheses.

[0108] In Mode 1, the UE reports a total of X+1 CSIs, including X (X=0, 1, 2) single-TRP CSIs and one NCJT CSI. In Mode 2, the UE reports one best CSI (one CSI) from all single-TRP CSIs and one NCJT CSI.

[0109] Within one CSI report, up to two single-TRP CSIs and one NCJT CSI can be reported (mode 1 with X=2). The NCJT CSI includes one CRI, two RIs (with one joint RI index), two PMIs, two LIs, and one CQI (up to four layers). The single-TRP CSI is the same as the existing CSI, and includes one CRI, one RI / PMI / LI, and one or two CQIs (up to eight layers, one CQI per CW).

[0110] New mapping orders (tables) of multiple fields within one CSI report are defined for several cases: Wideband CSI mapping order for Mode 1 with X=0 (Figure 11A). Wideband CSI is supported only for Mode 1 with X=0, i.e., NCJT CSI. CSI Part 1 mapping order for Modes 1 and 2 (Figure 11B). CSI Part 2 wideband mapping order for Modes 1 and 2 (same as Figure 11B). CSI Part 2 subband mapping order for Modes 1 and 2 (Figure 11C).

[0111] (CJT) 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] Considering fallback operation to NCJT (i.e., single TRP), CSI per TRP (i.e., single TRP CSI like NCJT CSI in Rel. 17) is also considered.

[0116] (CJT CSI) CSI acquisition for coherent joint transmission (CJT) for FR1 and up to four TRPs is considered, assuming an ideal backhaul, synchronization, and the same number of antenna ports across multiple TRPs. An improvement to the Rel. 16 / 17 Type 2 codebook is considered for CJT multi-TRP for FDD.

[0117] The following CSI extensions for CJT are being considered: CMR and IMR for measurements of up to four TRPs. Per-TRP CSI with inter-TRP CSI feedback for x-TRP CJT. Inter-TRP CSI: new feedback and codebook for inter-TRP phase matrix / inter-TRP amplitude matrix / inter-TRP matrix (including both amplitude and phase). Additional reportable x-TRP CJT CQI.

[0118] For multi-TRP CJT CSI, the following are being considered: - Setting restrictions on CMR / CSI for each TRP. - Inter-TRP CSI / PMI (e.g., inter-TRP phase with / without inter-TRP amplitude). [Option 1] Independent codebook and feedback in addition to Rel. 16 / 17 Type 2 codebook. [Option 2] W k ~ W f,k H W2 of CSI / PMI between TRPs conveyed with / within. Common / different FD basis for multiple TRPs.

[0119] For multi-panel Type 2 CSI for multi-TRP CJT, the following are being considered: - Extension of Rel. 16 / 17 Type 2 codebook and Type 2 PS codebook to multi-panel. - New antenna configuration for Type 2 multi-panel codebook.

[0120] W1 (SD basis) / W for each TRP f (FD basis) may be the same or different. k (NZC) may be different. W1 / W for each TRP f / W k may be selected jointly or individually. W1 / W f / W k Different scenarios with different options are preferable for the design of W. φ may be reported as separate items or kThese used policies relate to deployment scenarios (e.g., intra-site multi-TRP or inter-site multi-TRP).

[0121] For example, the precoding matrix for a 4-TRP CJT CSI (codebook) is W1 / W f / W k The W1 for each TRP may be the same or different, selected jointly or individually. k may be different and may be selected jointly or individually. f may be the same or different, and may be jointly or individually selected.

[0122] (Analysis #1) The Type 2 codebook (codebook structure) for CJT multi-TRP (mTRP) may be at least one of the following options, or may be a combination of some of the following options:

[0123] [Option 1A] (Codebook Structure 1A) SD / FD basis selection per TRP / per TRP group (port group or resource) + relative co-phasing / co-amplitude (including at least one of wideband and subband). For example, the codebook structure is given by the following equation:

[0124] where N is the number of TRPs or TRP groups. r is the co-amplitude relation. p r is the co-phase. r =p r =1 (no co-scaling) or α r Including the special case of =0.

[0125] [Option 1B] (Codebook Structure 1B) Joint SD / FD basis selection per TRP / TRP group (port group or resource) + relative phase / amplitude relationship (including at least one of wideband and subband). For example, the codebook structure is given by the following equation:

[0126] where N is the number of TRPs or TRP groups. r is the co-amplitude relation. p r is the co-phase. r =p r =1 (no co-scaling) or α r Including the special case of =0.

[0127] [Option 2] (Codebook Structure 2) SD basis selection per TRP / per TRP group (port group or resource) and joint FD basis selection (across N TRPs). For example, the codebook structure is given by the following equation:

[0128] Here, N is the number of TRPs or TRP groups.

[0129] It is possible that one of codebook structure options 1A and 2 is supported, or that both codebook structure options 1A and 2 are supported, with either being configured by the NW or selected by the UE in CSI reporting.

[0130] (Analysis #2) Codebook structure options 1A and 2 may include some reporting content (CSI fields) as follows:

[0131] ・W1, SD basis (i 1,1 , i 1,2 In both options A1 and A2, the SD basis is per TRP. However, the reported i 1,1 , i 1,2At least one of the following may follow one of several options: [Option 1] Multiple sets, each corresponding to one TRP; [Option 2] One set with increased bit width to include information for multiple TRPs.

[0132] ・W f , FD basis(i 1,5 , i 1,6,k ) In option A1, the FD basis is per TRP. In option 2, the FD basis is common to multiple TRPs. Here, there may be additional reporting of TRP-specific delay offset j1 based on the FD basis common to multiple TRPs.

[0133] ・Bitmap showing W2 and NZC (i 1,7,k In both options A1 and A2, the reporting may follow one of several options: [Option 1] A long bitmap for all TRPs. [Option 2] A separate bitmap for each TRP.

[0134] ・W2, SCI index (i 1,8,k ), SCI amplitude (i 2,8,k ). In both options A1 and A2, the reporting may follow one of several options: [Option 1] One SCI across multiple TRPs (per layer, as in the existing field). [Option 2] SCI per TRP (per layer, as in the existing field). An additional indicator j2 of the strongest TRP may be required. An additional indicator j3 of the amplitude relationship (co-amplitude) between the SCIs of two TRPs may be required. An additional indicator j4 of the phase relationship (co-phase) between the SCIs of two TRPs may be required.

[0135] W2, the amplitude of other coefficients for each layer (i 2,4,k In both options A1 and A2, the reporting may follow one of several options: [Option 1] Multiple sets, each corresponding to one TRP; [Option 2] One set with increased bit width to include information for multiple TRPs.

[0136] W2, the phase of other coefficients for each layer (i 2,5,k In both options A1 and A2, the reporting may follow one of several options: [Option 1] Multiple sets, each corresponding to one TRP; [Option 2] One set with increased bit width to include information for multiple TRPs.

[0137] Each option may be set by the NW, defined in the specifications, or reported by the UE.

[0138] Basically, each existing report content is augmented into multiple sets, with each set corresponding to one TRP, or one set for all TRPs. The bit width of a set may be maintained or increased depending on the report content. For option 1A / 2, there may be new report contents j1 / j2 / j3 / j4. Each new report content may be configured by the network, specified in the specification, or reported by the UE. For option 1A / 2, the mapping order with the report content and the bit width of each report content are unclear.

[0139] As such, there has been insufficient consideration of the reporting of CJT CSI, which may result in a decrease in communication throughput / communication quality.

[0140] Therefore, the present inventors came up with a method for reporting CJT CSI.

[0141] 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.

[0142] 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."

[0143] In the present disclosure, terms such as activate, deactivate, indicate (or 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0148] 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.

[0149] 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.

[0150] In this disclosure, "having the capability of..." may be read interchangeably as "supporting / reporting the capability of...".

[0151] In the present disclosure, panel, base station (gNB) panel, and TRP may be read interchangeably.

[0152] In the present disclosure, the terms network (NW), base station, gNB, and TRP may be interchangeable.

[0153] In the present disclosure, time domain resource allocation and time domain resource assignment may be read interchangeably.

[0154] In the present disclosure, beam, SD beam, SD vector, and SD 2D-DFT vector may be interchangeable. L, 2L, number of SD beams, number of beams, and number of SD 2D-DFT vectors may be interchangeable.

[0155] 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.

[0156] In the present disclosure, the terms "coefficient," "LC coefficient," "combining coefficient," "subband complex LC coefficient," "combining coefficient matrix," "amplitude and phase," and "amplitude coefficient and phase coefficient" may be interchangeable. In the present disclosure, the terms "NZC," "non-zero coefficient," "non-zero LC coefficient," "non-zero amplitude coefficient," and "complex coefficient" may be interchangeable.

[0157] In the present disclosure, co-phasing, phase matching, phase compensation, phase adjustment, phase difference, and phase relationship may be interchangeable. In the present disclosure, co-amplitude, amplitude compensation, amplitude adjustment, amplitude ratio, and amplitude relationship may be interchangeable. In the present disclosure, difference, ratio, and relative value may be interchangeable.

[0158] In the present disclosure, layer k and layer l may be interpreted as interchangeable.

[0159] In the present disclosure, size and length may be read interchangeably.

[0160] In the present disclosure, the terms TRP, transmission point, TCI state, and reference signal may be interchangeable.

[0161] (Wireless Communication Method) In each embodiment, TRP, CMR, CMR group, CRI, and CRI group may be read as interchangeable.

[0162] 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.

[0163] 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.

[0164] In each embodiment, the terms "strongest TRP" and "TRP with the strongest amplitude (SCI) among all TRPs" may be interpreted interchangeably.

[0165] In each embodiment, the terms multi-TRP, multi-panel, intra-site multi-TRP, and inter-site multi-TRP may be interchangeable.

[0166] In each embodiment, inter-TRP, inter-panel, inter-TRP difference, and inter-TRP comparison may be read interchangeably.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] Each embodiment may be applied to subband reporting or wideband reporting.

[0171] Each embodiment may be applied to a type 2 codebook or a type 2 port selection codebook.

[0172] A UE may receive a channel state information (CSI) reporting configuration for multiple transmission points (e.g., TRPs). The UE may determine a position and bit width for multiple indices in the CSI according to at least one of a transmission point, a layer, an index in the CSI, and the number of the multiple transmission points.

[0173] <Embodiment #1> This embodiment relates to the mapping order of multiple CSI fields in CSI Part 1 of one CSI report.

[0174] In the mapping order, the indicator of the number of non-zero wideband amplitude coefficients for at least one of Layer 0, Layer 1, and all layers may follow at least one of the following options: [Option 1] Each indicator includes information for multiple TRPs. For example, the indicator of the number for Layer 0 may mean the total number for Layer 0 for all TRPs. [Option 2] The indicator is an individual indicator for each TRP. The order may follow at least one of the following options: [Option 2a] Indices for Layer 0, Layer 1, and all layers for the first TRP, then indices for Layer 0, Layer 1, and all layers for the second TRP, etc. [Option 2b] Indices for Layer 0 for the first TRP, second TRP, third TRP, and fourth TRP, then indices for Layer 1 for the first TRP, second TRP, third TRP, and fourth TRP, etc.

[0175] In the mapping order, the CRI may follow at least one of the following options: [Option 1] The field contains CRI information for multiple TRPs. For example, the field indicates the index of a combination of N selected TRPs. [Option 2] There is a separate field for each TRP. The order is CRI of the strongest TRP, CRI of the second strongest TRP, etc.

[0176] For different codebook structures of Alternative 1A / 2, different options may be used or may be configured to the UE by the NW.

[0177] A UE capability for supporting separate metrics for each TRP may be introduced.

[0178] Example 1: For CSI Part 1 on PUCCH, the same new mapping order (table) may be specified for different codebook structures of Option 1A / 2, or different / separate new mapping orders (tables) may be specified. CJT CSI may be based on Extended Type 2 CSI and correspond to subband CSI instead of wideband CSI.

[0179] In the mapping order of CSI Part 1 on PUCCH (table, FIG. 5), the CRI portion may be changed to either option 1 or 2 in FIG.

[0180] In the mapping order of CSI Part 1 on PUCCH (table, FIG. 5), the part of the indicator of the number of non-zero wideband amplitude coefficients may be changed to any of options 1, 2a, or 2b in FIG.

[0181] Example 2: For CSI Part 1 on PUSCH, the same new mapping order (table) may be specified for different codebook structures of Option 1A / 2, or different / individual new mapping orders (tables) may be specified. CJT CSI may be based on Extended Type 2 CSI and correspond to subband CSI instead of wideband CSI.

[0182] In the mapping order of CSI Part 1 on PUSCH (table, FIG. 6), the CRI portion may be changed to either option 1 or 2 in FIG.

[0183] In the mapping order of CSI Part 1 on PUSCH (table, FIG. 6), the part indicating the number of non-zero wideband amplitude coefficients may be changed to any of options 1, 2a, or 2b in FIG.

[0184] According to this embodiment, the UE can properly report CSI Part 1.

[0185] <Embodiment #2> This embodiment relates to the mapping order of multiple CSI fields in CSI Part 2 of one CSI report on PUSCH.

[0186] In the mapping order, the multiple PMI field X1 in Group 0 may follow at least one of the following options: X1 may include an index of the SD basis and an index of the SCI per layer. [Option 1] Each existing index may include information for multiple TRPs (to be selected / reported). In this case, a new bit-width (table) for the PMI may be defined for the CJT CSI. A common bit-width or individual bit-widths may be defined for codebook structure options 1A and 2. In this case, the mapping order table may not be extended / modified. [Option 2] The index is an individual index for each TRP. The index may follow at least one of the following options: [Option 2a] For the PMI, a new bit-width (table) for each index for each TRP is defined. The mapping order may be TRP order first for each index, or index order first for each TRP. In this case, the mapping order table may not be extended / modified. [[Option 2b]] The mapping order table is extended / modified to take into account X1s from multiple TRPs.

[0187] In the mapping order, multiple PMI fields X2 in group 1 / 2 may follow at least one of several options above for X1.

[0188] For different codebook structures of Alternative 1A / 2, different options may be used or may be configured to the UE by the NW.

[0189] A UE capability for supporting separate metrics for each TRP may be introduced.

[0190] Example 1: For option 1 of multiple PMI field X1, as in the example of Figure 16, for type 2 CJT CSI (codebookType = typeII-CJT-r18), 1,1 , i 1,2 , i 1,8,1 A new bit width value may be defined for .

[0191] For option 2a of multiple PMI fields X1, as in the example of Figure 17, for type 2 CJT CSI (codebookType = typeII-CJT-r18), first, i for one TRP 1,1 , i 1,2 , i 1,8,1 , i 1,8,2 , i 1,8,3 , i 1,8,4 may be mapped.

[0192] For option 2a of multiple PMI field X1, as in the example of FIG. 18, for type II CJT CSI (codebookType=typeII-CJT-r18), first (i 1,1 , i 1,2 ) are mapped in TRP order, and then (i 1,8,1 , i 1,8,2 , i 1,8,3 , i 1,8,4 ) may be mapped in TRP order.

[0193] For option 2a of multiple PMI field X1, as in the example of FIG. 19, for type II CJT CSI (codebookType=typeII-CJT-r18), first (i 1,1 , i 1,2 ) are mapped in TRP order, and then the SCI(i 1,8,1 , i 1,8,2 , i 1,8,3 , i 1,8,4 ) may be mapped. In this case, only one set of SCIs may be needed. Different indices may have different designs depending on whether one set or multiple sets correspond to multiple TRPs.

[0194] For option 2b of group 0 (multiple PMI field X1), in the mapping order of CSI part 2 on PUSCH (table, FIG. 7), the CRI portion may be changed to option 2b or option 1 / 2a in FIG.

[0195] Example 2: For the new bit-width table, the example for multiple PMI field X2 may be similar to the example for multiple PMI field X1. Different options may be applied to each index depending on whether one set or multiple sets correspond to multiple TRPs.

[0196] Regarding the new mapping order table, the example for groups 1 / 2 may be similar to the example for group 0. Different options may apply to groups 0, 1, and 2.

[0197] The new bit-width table defined for the N-TRP (N TRP) CJT may reuse most of the existing table (Option 2a). As in the example of Figure 21, when Option 2a (SCI per layer across all TRPs, Figure 19) is used for multiple PMI fields X1, one set (i 2,3,1 , i 2,3,2 , i 2,3,3 , i 2,3,4 ) and one set (i 1,5 , i 1,6,1 , i 1,6,2 , i 1,6,3 , i 1,6,4 ) and the new report contents for N TRPs ({i 2,4,l} l=1,...v , {i 2,5,l} l=1,...v , {i 1,7,l} l=1,...v ) and a bit width for may be specified.

[0198] The mapping order (table) may be extended (option 2b). For group 0 (multiple PMI fields X1), the mapping order (table, Figure 7) of CSI part 2 on PUSCH may be changed as in option A or B of Figure 22. In option A, group 0 is mapped first in TRP order, then group 1 is mapped in TRP order, and then group 2 is mapped in TRP order. In option B, groups 0, 1, and 2 for the first TRP are mapped first, and then they are mapped in TRP order.

[0199] Different options may be used for Group 0 and Groups 1 and 2. Group 0 (multiple PMI field X1) may contain information for multiple TRPs, and Groups 1 and 2 (multiple PMI field X2) may contain information for each TRP. In the mapping order of CSI Part 2 on the PUSCH (Table, Figure 7), Group 0 may be changed to Group 0 in Figure 23, and Groups 1 and 2 may be changed to Group 1 / 2 options A or B in Figure 23. In option A, Group 1 is mapped first in TRP order, and then Group 2 is mapped in TRP order. In option B, Groups 1 and 2 for the first TRP are mapped first, and then they are mapped in TRP order.

[0200] According to this embodiment, the UE can properly report CSI Part 2 on the PUSCH.

[0201] <Embodiment #3> This embodiment relates to the bit width of new report content.

[0202] If new report contents are supported / configured, the bit width of each new report content is specified, and the bit width may be specified in a table for at least one of the multiple PMI field X1 (group 0) and the multiple PMI field X2 (groups 1 and 2).

[0203] j1 (or layer-specific (layer k) j 1,k) may be included in the multi-PMI field X2 for FD basis selection. j1 may be per TRP. The FD basis offset may be omitted, considering that the strongest TRP is the reference TRP starting from offset 0. In the case of N TRPs, N-1 sets of j1 may be needed. For example, j 1,k,n may denote j1 for the kth layer and the nth TRP.

[0204] j2 may be included in the multiple PMI field X1 or the multiple PMI field X2, or may be included in CSI part 1.

[0205] j3 / j4 (or layer-specific (layer k) j 3,k / j 4,k ) may be included in the multiple PMI field X1 or the multiple PMI field X2, or may be included in CSI Part 1. Similar to j1, in the case of N TRPs, N-1 sets of j3 / j4 may be required. In the bit width table of the multiple PMI field X2, j3 / j4 may be placed next to "SCI amplitude per layer." A new group x may be added for j3 / j4. For example, in the mapping order table, new group 3 / 4 for j3 / j4 may be placed after group 2 / 3. For example, in the mapping order table, new group 0' for j3 / j4 may be placed after group 0.

[0206] Depending on at least one of whether new reporting content is required and which option of embodiment #1 / #2 is used, different codebook structures of option 1A / 2 may be used. The codebook structure of option 1A / 2 may be configured to the UE by the NW.

[0207] UE capabilities may be introduced that support at least one of new reporting content and separate indicators for each new reporting content and each TRP.

[0208] Example: In the new bit width table, j 1,k,nmay be included in the multiple PMI field X2. As shown in the example of FIG. 24, in the table of the new bit width of the multiple PMI field X2, 1,6,k After that, (j 1,k,2 , j 1,k,3 , j 1,k,4 ) may be placed.

[0209] In the mapping order of CSI Part 1 on PUSCH (table, FIG. 6), j2 may be placed after the CRI as in the example of FIG. 25. Alternatively, j2 may be placed before the CRI. Alternatively, j2 may be placed instead of the CRI.

[0210] According to this embodiment, the UE can properly report new report content.

[0211] <Supplementary Information> [Notification of Information to UE] In the above-described embodiments, any information may be notified to the UE (from a network (NW) (e.g., a base station (BS))) (in other words, reception of any information from the BS by the UE) using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0212] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards.

[0213] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0214] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0215] [Notification of Information from UE] In the above-described embodiments, notification of any information from the UE (to the NW) (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0216] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader.

[0217] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0218] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0219] [Application of Each Embodiment] At least one of the above-described embodiments may be applied when a specific condition is met. The specific condition may be defined in a standard or may be notified to a UE / BS using higher layer signaling / physical layer signaling.

[0220] At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.

[0221] The specific UE capability may indicate at least one of the following: Support for a separate indicator for each TRP Support for at least one of new reporting content and separate indicators for each new reporting content and each TRP.

[0222] Furthermore, the above-mentioned 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., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), 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)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0223] 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)).

[0224] Furthermore, at least one of the above-described embodiments may be applied when specific information related to the above-described embodiments (or performing the operations of the above-described embodiments) is configured / activated / triggered in the UE by higher layer signaling / physical layer signaling. For example, the specific information may be information indicating that the functions of the respective embodiments are enabled, any RRC parameters for a specific release (e.g., Rel. 18 / 19), etc.

[0225] 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.

[0226] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal having: a receiving unit that receives channel state information (CSI) reporting configuration for a plurality of transmission points; and a control unit that determines a position and a bit width for a plurality of indicators in the CSI according to at least one of a transmission point, a layer, an indicator in the CSI, and the number of the plurality of transmission points. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the position is a position in CSI Part 1 or CSI Part 2. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein, in the CSI, positions of multiple values ​​of multiple indicators for the same transmission point are adjacent to each other. [Supplementary Note 4] The terminal according to any of Supplements 1 to 3, wherein, in the CSI, positions of multiple values ​​for the same indicator for the plurality of transmission points are adjacent to each other.

[0227] (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.

[0228] 26 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0229] 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.

[0230] 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.

[0231] 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))).

[0232] 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.

[0233] 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).

[0234] 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.

[0235] 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.

[0236] 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.

[0237] 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.

[0238] The core network 30 may include network functions (Network Functions (NF)) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0239] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0240] 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).

[0241] 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.

[0242] 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.

[0243] 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.

[0244] 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).

[0245] 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.

[0246] 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.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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).

[0254] 27 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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.

[0265] 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.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0270] 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.

[0271] The transceiver 120 may transmit channel state information (CSI) reporting configurations for multiple transmission points. The controller 110 may determine positions and bit widths for multiple indicators in the CSI according to at least one of a transmission point, a layer, an indicator in the CSI, and the number of the multiple transmission points.

[0272] (User terminal) Fig. 28 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.

[0273] 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.

[0274] 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.

[0275] 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.

[0276] 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.

[0277] 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.

[0278] 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.

[0279] 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.

[0280] 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.

[0281] 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.

[0282] 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.

[0283] 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.

[0284] 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.

[0285] 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.

[0286] 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.

[0287] 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.

[0288] 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.

[0289] The transceiver unit 220 may receive a channel state information (CSI) reporting configuration for a plurality of transmission points. The control unit 210 may determine a position and a bit width for a plurality of indicators in the CSI according to at least one of a transmission point, a layer, an indicator in the CSI, and the number of the plurality of transmission points.

[0290] The location may be a location within CSI Part 1 or CSI Part 2.

[0291] Within the CSI, the positions of multiple values ​​of multiple indices for the same transmission point may be adjacent to each other.

[0292] Within the CSI, for the same index, the positions of the values ​​for the transmission points may be adjacent to each other.

[0293] (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.

[0294] 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.

[0295] 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 29 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.

[0296] 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.

[0297] 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.

[0298] 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.

[0299] 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.

[0300] 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.

[0301] 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.

[0302] 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.

[0303] 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.

[0304] 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).

[0305] 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.

[0306] 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.

[0307] (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.

[0308] 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.

[0309] 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.

[0310] 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.

[0311] 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.

[0312] 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.

[0313] 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.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] 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.

[0321] 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.

[0322] 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.

[0323] 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.

[0324] 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.

[0325] 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."

[0326] 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.

[0327] 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.

[0328] 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.

[0329] 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.

[0330] 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.

[0331] 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.

[0332] 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.

[0333] 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).

[0334] 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).

[0335] 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).

[0336] 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.

[0337] 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.

[0338] 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).

[0339] 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.

[0340] 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.

[0341] 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.

[0342] 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.

[0343] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0344] 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.

[0345] 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.

[0346] 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.

[0347] 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.

[0348] 30 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.

[0349] 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.

[0350] 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).

[0351] 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.

[0352] 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.

[0353] 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.

[0354] 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.

[0355] 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.

[0356] 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).

[0357] 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.

[0358] 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)).

[0359] 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.

[0360] 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.

[0361] 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.

[0362] 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.

[0363] 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.

[0364] 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).

[0365] 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."

[0366] 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.

[0367] 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.

[0368] 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.

[0369] 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.

[0370] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0371] 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.

[0372] 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."

[0373] 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.

[0374] 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."

[0375] 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.

[0376] 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.

[0377] 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").

[0378] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0379] 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.

[0380] This application is based on Japanese Patent Application No. 2022-133337, filed on August 24, 2022, the contents of which are incorporated herein in their entirety.

Claims

1. A receiving unit that receives settings for reporting channel status information (CSI) for multiple transmission points, A terminal having a transmission point, a layer, an index in the CSI, and a control unit that determines the position and bit width for a plurality of indexes in the CSI according to at least one of the number of the plurality of transmission points.

2. The terminal according to claim 1, wherein the aforementioned location is a location within CSI Part 1 or CSI Part 2.

3. The terminal according to claim 1, wherein, within the CSI, the positions of multiple values ​​for the multiple transmission points are adjacent to each other for the same index.

4. The steps include receiving the settings for reporting channel status information (CSI) for multiple transmission points, A wireless communication method for a terminal, comprising the step of determining the position and bit width for a plurality of indicators in the CSI according to at least one of a transmission point, a layer, an indicator in the CSI, and the number of the plurality of transmission points.

5. A transmission unit that transmits settings for reporting channel status information (CSI) for multiple transmission points, A base station having a transmission point, a layer, an index in the CSI, and a control unit that determines the position and bit width for a plurality of indexes in the CSI according to at least one of the following: the number of the plurality of transmission points.

6. A system including a terminal and a base station, The aforementioned terminal is A receiving unit that receives settings for reporting channel status information (CSI) for multiple transmission points, The system includes a transmission point, a layer, an index within the CSI, and a control unit that determines the position and bit width for a plurality of indexes within the CSI according to at least one of the following: the number of the plurality of transmission points. The aforementioned base station is A system having a transmitting unit that transmits the aforementioned settings.