Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit which receives an index for reporting channel state information (CSI) of a plurality of transmission / reception points (TRP) for coherent joint transmission (CJT), and a reception unit which receives an index for reporting channel state information (CSI) of a plurality of transmission / reception points (TRP) for coherent joint transmission (CJT); and a control unit that determines a plurality of values based on the index, the plurality of values being a plurality of values of one of the following parameters, the plurality of TRP values are a first parameter related to the number of beams, a second parameter used for calculation of the number of frequency domain discrete Fourier transform (DFT) vectors, and a third parameter used for calculation of the number of selected CSI-reference signal (RS) ports, and the plurality of TRP values are the plurality of values respectively corresponding to the plurality of TRP values, a first parameter related to the number of beams, a second parameter used for calculation of the number of frequency domain discrete Fourier transform (DFT) vectors, and a third parameter used for calculation of the number of selected CSI-RS ports. According to one embodiment of the present disclosure, CSI can be appropriately reported.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized to achieve even higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Releases 10-14) has been standardized to further enhance the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP (registered trademark)) Releases 8 and 9).

[0003] Research is also underway on successor systems to LTE (e.g., also referred to as the fifth-generation mobile communication system (5G), 5G+ (plus), the sixth-generation mobile communication system (6G), New Radio (NR), and 3GPP Rel. 15 and later).

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UT+ RA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., NR), research is underway to report channel state information (CSI) based on received reference signals. Furthermore, research is underway to improve communication performance in high- and medium-speed mobile terminals (user terminals, user equipment (UE)).

[0009] However, CSI / codebooks in such terminals have not been fully studied. If such a method is not clearly defined, there is a concern that communication throughput, communication quality, etc. may deteriorate.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that determine appropriate CSI / codebook.

[0011] Means for solving problems

[0012] A terminal according to one embodiment of the present disclosure includes: a receiving unit for receiving an index for channel state information (CSI) reporting of multiple transmission / reception points (TRPs) for coherent joint transmission (CJT); and a control unit for determining multiple values ​​based on the index, the multiple values ​​being multiple values ​​of one of the following parameters and corresponding to the multiple TRPs, respectively: a first parameter related to the number of beams, a second parameter for calculating the number of frequency-domain discrete Fourier transform (DFT) vectors, and a third parameter for calculating the number of selected CSI-reference signal (RS) ports.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, CSI can be appropriately reported. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0017] Figure 3A as well as Figure 3B An example of a type 2 PS codebook / enhanced type 2 PS codebook is shown.

[0018] Figure 4A as well as Figure 4BAn example of adding an enhanced type 2 PS codebook is shown.

[0019] Figure 5 An example of a parameter combination for the enhanced type 2 codebook is shown.

[0020] Figure 6 An example of a parameter combination for adding an enhanced type 2 PS codebook is shown.

[0021] Figure 7A as well as Figure 7B An example of a combination of independent (separate) parameters according to Embodiment #0 is shown.

[0022] Figure 8A as well as Figure 8B L involved in embodiment #0 is shown n An example of multiple combination candidates.

[0023] Figures 9A-9C L involved in embodiment #1 is shown n 、p v , an example of multiple candidates for β.

[0024] Figure 10A as well as Figure 10B An example of a plurality of linkage candidates according to Embodiment #3 is shown.

[0025] Figure 11A as well as Figure 11B Shows the p involved in Option 1 of Implementation #6 v,n An example of multiple combination candidates.

[0026] Figure 12A as well as Figure 12B Shows the p involved in Option 2 of Implementation #6 v,n An example of multiple combination candidates.

[0027] Figure 13 Shows the p involved in Option 3 of Implementation #6 v,n An example of multiple combination candidates.

[0028] Figure 14 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0029] Figure 15 This is a diagram showing an example of the configuration of a base station according to one embodiment.

[0030] Figure 16 This is a diagram showing an example of the configuration of a user terminal according to an embodiment.

[0031] Figure 17This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment.

[0032] Figure 18 This is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0033] (CSI report or reporting)

[0034] In Rel.15 NR, a terminal (also referred to as a user terminal, user equipment (UE), etc.) generates (also referred to as determine, calculate, estimate, measure, etc.) channel state information (CSI) based on a reference signal (RS) (or resources used for the RS) and transmits (also referred to as report, feedback, etc.) the generated CSI to the network (e.g., base station). This CSI may be transmitted to the base station using, for example, an uplink control channel (e.g., the physical uplink control channel (PUCCH)) or an uplink shared channel (e.g., the physical uplink shared channel (PUSCH)).

[0035] The RS used in the generation of CSI may be, for example, at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), and a demodulation reference signal (DeModulation Reference Signal (DMRS)).

[0036] The CSI-RS may also include at least one of a non-zero power (NZP) CSI-RS and CSI-Interference Management (CSI-Interference Measurement, CSI-IM). An SS / PBCH block, also known as an SS block (SSB), includes the SS and PBCH (and the corresponding DMRS). Furthermore, the SS may include at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

[0037] In addition, CSI may also include at least one of a channel quality indicator (Channel Quality Indicator (CQI)), a precoding matrix indicator (Precoding Matrix Indicator (PMI)), a CSI-RS resource indicator (CSI-RS Resource Indicator (CRI)), a SS / PBCH block resource indicator (SS / PBCH Block Resource Indicator (SSBRI)), a layer indicator (Layer Indicator (LI)), a rank indicator (Rank Indicator (RI)), L1-RSRP (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), etc.

[0038] The UE may also receive information related to CSI reporting (report configuration information) and control CSI reporting based on this report configuration information. This report configuration information may be, for example, the "CSI-ReportConfig" information element (IE) of the Radio Resource Control (RRC) information element. Furthermore, in this disclosure, RRC IEs may interchangeably with RRC parameters and higher-layer parameters.

[0039] The report configuration information (eg, “CSI-ReportConfig” of RRC IE) may include at least one of the following.

[0040] - Information related to the type of CSI report (report type information, for example, "reportConfigType" of RRC IE)

[0041] - Information related to one or more quantities (quantities) of CSI to be reported (one or more CSI parameters) (report quantity information, for example, "reportQuantity" of RRC IE)

[0042] - Information related to RS resources used to generate the quantity (the CSI parameter) (resource information, for example, "CSI-ResourceConfigId" in RRC IE)

[0043] - Information related to the frequency domain to be reported by the CSI (frequency domain information, for example, "reportFreqConfiguration" in the RRC IE)

[0044] For example, the reporting type information may also indicate (indicate) periodic CSI (P-CSI) reporting, aperiodic CSI (A-CSI) reporting, or semi-persistent CSI (SP-CSI) reporting.

[0045] In addition, the reporting amount information may also specify a combination of at least one of the above-mentioned CSI parameters (eg, CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0046] Alternatively, the resource information may be an ID of an RS resource. The RS resource may include, for example, a non-zero-power CSI-RS resource or SSB, and a CSI-IM resource (eg, a zero-power CSI-RS resource).

[0047] In addition, frequency domain information can also indicate the frequency granularity of the CSI report. This frequency granularity can also include, for example, broadband and subband. Broadband refers to the entire CSI reporting band. Broadband can be, for example, the entirety of a certain carrier (component carrier (CC), cell, serving cell), or the entirety of the bandwidth part (BWP) within a certain carrier. Broadband can also be referred to as CSI reporting band, entire CSI reporting band, etc.

[0048] A subband is a portion of a wideband and can be composed of one or more resource blocks (RBs or PRBs). The size of a subband can also be determined by the size of the bandwidth (the number of PRBs).

[0049] Frequency domain information may also indicate whether wideband or subband PMI is reported (for example, the frequency domain information may also include the "pmi-FormatIndicator" RRC IE used to determine whether wideband PMI reporting or subband PMI reporting is used). The UE may also determine the frequency granularity of the CSI report (i.e., whether wideband PMI reporting or subband PMI reporting) based on at least one of the aforementioned reporting amount information and the frequency domain information.

[0050] When wideband PMI reporting is configured (determined), a single wideband PMI may be reported for the entire CSI reporting band. On the other hand, when subband PMI reporting is configured, a single wideband indication i1 may be reported for the entire CSI reporting band, and a subband indication i2 may be reported for each of one or more subbands within the entire CSI report (e.g., a subband indication for each subband).

[0051] The UE performs channel estimation using the received RS and estimates the channel matrix H. The UE feeds back a parameter index (PMI) determined based on the estimated channel matrix.

[0052] The PMI may also indicate a precoder matrix (also referred to as a precoder) that the UE considers suitable for downlink (DL) transmissions to the UE. Each PMI value may correspond to a precoder matrix. A set of PMI values ​​may also correspond to a set of different precoder matrices, referred to as a precoder codebook (also referred to as a codebook).

[0053] In the spatial domain, a CSI report may include more than one type of CSI. For example, the CSI may include at least one of a first type (Type 1 CSI) used for single-beam selection and a second type (Type 2 CSI) used for multi-beam selection. Single-beam may be referred to as a single layer, and multi-beam may be referred to as multiple beams. Furthermore, Type 1 CSI may not assume multi-user multiple input multiple output (MU-MIMO), while Type 2 CSI may assume multi-user MIMO.

[0054] The codebooks described above may also 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 and Type 1 multi-panel codebook) may be specified for each.

[0055] In the present disclosure, type 1 and type I may be replaced with each other. In the present disclosure, type 2 and type II may be replaced with each other.

[0056] The uplink control information (UCI) type may also include at least one of Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), Scheduling Request (SR), and CSI. UCI can be carried on either the PUCCH or the PUSCH.

[0057] In Rel.15 NR, UCI can include a CSI part for wideband PMI feedback. CSI report #n contains PMI wideband information when reported.

[0058] In Rel.15 NR, UCI can include two CSI parts for subband PMI feedback. CSI Part 1 contains wideband PMI information. CSI Part 2 contains one wideband PMI and several subband PMIs. CSI Part 1 and CSI Part 2 are coded independently.

[0059] In Rel.15 NR, the UE is configured with a report configuration consisting of N (N ≥ 1) CSI report configurations and a resource configuration consisting of M (M ≥ 1) CSI resource configurations via higher layers. For example, the CSI report configuration (CSI-ReportConfig) includes a channel measurement resource configuration (resourcesForChannelMeasurement), a CSI-IM resource configuration for interference (csi-IM-ResourceForInterference), an NZP-CSI-RS configuration for interference (nzp-CSI-RS-ResourceForInterference), and a report quantity (reportQuantity). The channel measurement resource configuration, the CSI-IM resource configuration for interference, and the NZP-CSI-RS configuration for interference 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, e.g., an NZP-CSI-RS resource set or a CSI-IM resource set).

[0060] In order to achieve the premise (hypotheses) of more dynamic channels / interference for NCJT in both FR1 and FR2, the evaluation and regulation of CSI reports for transmission of multiple TRPs and at least one of multiple panels in DL are being studied.

[0061] (Codebook setting)

[0062] The UE is configured with codebook-related parameters (codebook configuration (CodebookConfig)) through higher-layer signaling (RRC signaling). The codebook configuration is included in the CSI report configuration (CSI-ReportConfig) of the higher-layer (RRC) parameters.

[0063] In the codebook setting, at least one codebook is selected from a plurality of codebooks including type 1 single panel (typeI-SinglePanel), type 1 multi-panel (typeI-MultiPanel), type 2 (typeII), and type 2 port selection (typeII-PortSelection).

[0064] Codebook parameters include parameters related to codebook subset restriction (CBSR) ("...Restriction" in CodebookConfig). CBSR settings indicate which PMI reports are allowed ("1") and which are not allowed ("0") for the precoder associated with the CBSR bit. Each bit in the CBSR bitmap corresponds to one codebook index / antenna port.

[0065] (CSI report settings)

[0066] In addition to the codebook configuration (CodebookConfig), the Rel.16 CSI reporting configuration (CSI-ReportConfig) also includes CSI-RS resources for channel measurement (resourcesForChannelMeasurement (CMR)), CSI-RS resources for interference measurement (csi-IM-ResourcesForInterference (ZP-IMR) and nzp-CSI-RS-ResourcesForInterference (NZP-IMR)). CSI-ReportConfig parameters other than codebookConfig-r16 are also included in the Rel.15 CSI reporting configuration.

[0067] In Rel. 17, an enhanced CSI reporting configuration (CSI-ReportConfig) for CSI measurement / reporting for multiple TRPs using NCJT is under investigation. In this CSI reporting configuration, two CMR groups corresponding to each of the two TRPs are configured. The CMRs within a CMR group can also be used for measurements of at least one of multiple TRPs and a single TRP using NCJT. The N CMR pairs for NCJT are configured via RRC signaling. The UE can also be configured via RRC signaling to determine whether to use the CMRs of the CMR pair for single TRP measurements.

[0068] For CSI reports associated with NCJT measurements of multiple TRPs / panels configured through a single CSI report configuration, support for at least one of the following options 1 and 2 is under study.

[0069] <Option 1>

[0070] The UE is configured to report X (X=0, 1, 2) CSIs associated with the single TRP measurement assumptions and one CSI associated with the NCJT measurement. In the case of X=2, the two CSIs are associated with two different single TRP measurements using CMRs of different CMR groups.

[0071] Option 2

[0072] The UE may also be configured to report a CSI associated with the best measurement result for NCJT and single TRP measurement assumptions.

[0073] As described above, in Rel. 15 / 16, the CBSR is configured for each codebook configuration in each CSI reporting configuration. That is, the CBSR is applied to all CMRs, etc. within the corresponding CSI reporting configuration.

[0074] However, in the CSI reporting configuration for multiple TRPs based on Rel.17 of the CSI reporting configuration, when the above-mentioned options 1 and 2 are applied, it is possible to perform the following measurement configuration.

[0075] Option 1 (X=0): Only NCJT CSI measurement.

[0076] Option 1 (X=1): Measurement of the CSI of the NCJT and the CSI of a single TRP (one TRP).

[0077] Option 1 (X=2): Measurement of the CSI of the NCJT and the CSI of a single TRP (two TRPs).

[0078] Option 2: Measurement of both NCJT CSI and single TRP CSI.

[0079] The multiple subbands for CSI report #n indicated and provided by the higher layer parameter csi-ReportingBand may also include the lowest subband of csi-ReportingBand as subband 0 and be numbered consecutively in ascending order.

[0080] (Type 1 codebook)

[0081] For base station panels, a Type 1 single-panel codebook and a Type 1 multi-panel codebook are specified as Type 1 codebooks (Rel.15). In a Type 1 single-panel, for (N1, N2), the antenna pattern of the CSI antenna port array (logical setting) is specified. The number of CSI-RS antenna ports P CSI-RS In type 1 multi-panel, for the number of CSI-RS antenna ports P CSI-RS and (N g,N1,N2), specifies the antenna model of the CSI antenna port array (logical setting).

[0082] For Rel.15 type 1 single panel CSI, the UE's higher-layer parameter for the codebook type (subType in type1 within codebookType within CodebookConfig) is set to type 1 single panel ('typeI-SinglePanel'). In the case where the number of layers v∈{2,3,4} is not 1,1 ,i 1,2 ,i2. In the case of layer number v∈{2,3,4}, the PMI value corresponds to the four codebook indices i 1,1 ,i 1,2 ,i 1,3 ,i2. In the case that the number of layers is not v∈{2,3,4}, the composite codebook index i1=[i 1,1 i 1,2 In the case of the number of layers v∈{2,3,4}, the composite codebook index i1=[i 1,1 i 1,2 i 1,3 i1 may also be an index for a wideband, and i2=n may also be an index for a subband / phase.

[0083] For P CSI-RS The specification specifies the supported (N1, N2) and (O1, O2) settings (value combinations). (N1, N2) represents the number of two-dimensional (2D) antenna elements and is set via the higher-level parameters n1-n2 within the moreThanTwo parameter in nrOfAntennaPorts within typeI-SinglePanel. n1-n2 are bitmap parameters with N1, O1, N2, and O2 bits. (O1, O2) represents the 2D oversampling factor.

[0084] In the codebook for 1-layer CSI reporting and codebook mode (codebookMode) = 1, the index i corresponding to the horizontal beam 1,1 = l = 0, 1, ..., N1O1-1, index i corresponding to the vertical beam 1,2 =m=0,1,...,N2O2-1,i2=n=0,1,2,3,use antenna ports 3000 to 2999+P CSI-RS The matrix used in the 1-layer CSI report codebook is W_i 1,1 ,i 1,2 ,i2^(1). Here, W l,m,n （1） Provided by the following formula.

[0085]

[0086] Here, v l,m The elements (SD basis) of the 2D-SD (DFT) basis vectors (matrix, exp(j2πln1 / O1N1)×exp(j2πmn2 / O2N2), n1=0,1,...,N1-1, n2=0,1,...,N2-1) with N1 rows and N2 columns. Phase matching (co-phasing) between polarizations (horizontal and vertical polarizations) φ n = exp(jπn / 2), which represents the phase of the other polarization relative to the phase of one polarization.

[0087] For Rel.15 type 1 multi-panel CSI, in addition to N1 and N2, the number of panels N is set compared to type 1 single panel. g As inter-panel phase matching (inter-panel co-phasing, phase compensation between panels), i was added. 1,4 For each panel, the same SD beam is selected (precoding matrix W l ), only the inter-panel phase matching is reported.

[0088] For P CSI-RS , the specification specifies the supported (N g ,N1,N2) and (O1,O2) settings (value combination). (N1,N2) are set by ng-n1-n2 in typeI-MultiPanel. 1,1 is {0,1,...,N1O1-1}. 1,2 is {0,1,...,N2O2-1}. For q=1,...,N g -1,i 1,4,q is {0,1,2,3}. i2 is {0,1,2,3}. For codebook mode (codebookMode) = 1, use antenna ports 3000 to 2999+P CSI-RS The matrix used in the 1-layer CSI report codebook is W_i 1,1 ,i 1,2 ,i 1,4 ,i2^(1). Here, W l,m,p,n （1） =W l,m,p,n ^1,N g ,1.

[0089] For N g=W_l,m,p,n^1,N of {2,4} g ,1 and W_l,m,p,n^2,N g ,1 (for the first layer, N g =2, codeBookMode=1 matrix W l,m,p,n 1,2,1 ; For the second layer, N g =2, codeBookMode=1 matrix W l,m,p,n 2,2,1 ; For the first layer, N g =4, codeBookMode=1 matrix W l,m,p,n 1,4,1 ; and for the second layer, N g =4, codeBookMode=1 matrix W l,m,p,n 2,4,1 ) is provided by the following formula.

[0090]

[0091] Here, φ n =e jπn / 2 . For N g =2, p=p1, for N g =4, p = [p1, p2, p3]. φ_p1, φ_p2, φ_p3 represent the phase matching between panels. The same beam is selected for panels 0, 1, 2, and 3 (SD beam matrix, precoding matrix W l ), 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.

[0092] (Type 2 codebook)

[0093] In this disclosure, a matrix Z having X rows and Y columns is sometimes expressed as Z(X×Y).

[0094] For the provided layer 1, the type 2 CSI of Rel.15 generates the precoding vector for each subband (SB-wise) based on the following equation.

[0095] W l (N t × N3) = W1W 2,l (F1)

[0096] N t is the number of antennas / antenna ports. N3 is the total number of precoding (beamforming) matrices (precoders) (number of subbands) represented by the PMI.

[0097] W1 (N t ×2L) are L∈{2,4} (oversampled) spatial domain (SD) vectors (SD2D-DFT vector, SD beam, SD matrix). L is the number of beams. The actual number of beams considering 1 horizontal polarization and 1 vertical polarization is 2L. For example, L=2 SD 2D-DFT vectors are b i 、b j .

[0098] W 2,l (2L×N3) is a matrix (LC coefficient matrix) consisting of linear coupling coefficients (linear combination (LC) coefficients, sub-band complex LC coefficients, and coupling coefficients) for layer l. 2,l represents beam selection and phase matching (co-phasing) between two polarizations. For example, two W 2,l c i 、c j For example, the channel vector h is linearly coupled via 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,l In addition, the type 2 CSI of Rel.15 only supports ranks 1 and 2.

[0099] In Type 2 CSI, the channel (channel matrix) for a user is represented by the linear coupling of two polarizations and L beams (L SD2D-DFT vectors). Rel.15 Type 2 CSI supports ranks 1 and 2.

[0100] (Enhanced Type 2 Codebook (Rel.16))

[0101] Rel.16 Type 2 CSI (enhanced Type 2 codebook) reduces the W 2,l The associated overhead. Rel.16 Type 2 CSI supports ranks 3 and 4 in addition to ranks 1 and 2.

[0102] In Rel.16 type 2 CSI, for the provided layer 1, information based on the following formula can also be reported by the UE.

[0103] W l = W1W ~ l Wf,l H (F2)

[0104] W 2,l By W ~ l W f,l H To approximate the matrix W ~ It can also be represented by a ~ (wavy line) on the W. ~ l It can also be expressed as W ~ 2,l Matrix W f,l H It's W f,l The adjoint matrix can be obtained by W f,l It is obtained by taking the conjugate transpose of .

[0105] For CSI reporting, the UE can also be configured with one of two subband sizes. This subband (CQI subband) can also be defined as N PRB SB The number of PMI subbands per CQI subband, R, is set using the RRC IE (numberOfPMI-SubbandsPerCQI-Subband). R is controlled by the total number of precoding matrices, N3, represented by the PMI, as a function of the number of subbands specified in the CSI-ReportingBand field, the subband size specified by subbandSize, and the total number of PRBs in the BWP.

[0106] W1 (N t ×2L) represents multiple (oversampled) SD 2D-DFT vectors (matrix). To represent this matrix, multiple indices of the SD 2D-DFT vectors and the two-dimensional oversampling factor are reported. The spatial response / distribution represented by the SD 2D-DFT vectors is also called an SD beam.

[0107] W ~ l (2L×M v ) is a matrix of LC coefficients. To represent this matrix, a maximum of K0 non-zero coefficients (non-zero coefficients (NZCs) or LC coefficients with non-zero amplitudes) are reported. This report consists of two parts: a bitmap that captures the NZC positions and a quantized NZC.

[0108] W f,l (N3×Mv ) is for layer l, by M v A matrix consisting of vectors (frequency domain (FD) basis vectors), each vector containing N3 FD bases. N3 is the total number (number of subbands) of precoding (beamforming) matrices (precoders) indicated by PMI as a function of the number of subbands set in the csi-ReportingBand. The csi-ReportingBand indicates whether the CSI for a certain BWP is reported as continuous or discontinuous subbands within the BWP. There are M per layer. v FD basis (FD DFT basis) vectors. In the case of N3>19, select M from the intermediate subset (InS) of size N3' (<N3) v FD bases are selected. In the case of N3≤19, log2(C(N3-1,M v -1)) bits. Here, C(N3-1,M v -1) means select M from N3-1 v -1 combinations (combinatorial coefficient C(x,y)), also known as binomial coefficients.

[0109] The frequency domain response / distribution (frequency response) represented by the linear coupling of FD basis vectors and LC coefficients can also be called an FD beam. The FD beam can also correspond to a delay profile (time response).

[0110] The PMI subband size is given by the CQI subband size / R, R∈{1,2}. The number of FD basis vectors M for the provided rank v v By ceil (p v ×N3 / R). The number of FD bases is the same for all layers l∈{1,2,3,4}. v Set by senior management.

[0111] The multiple precoding matrices represented by PMI are based on L+M v vectors are determined.

[0112] The elements of the L SD basis vectors (SD basis) v for beam index i = 0, 1, ..., L-1 m_1^（i）,m_2^（i） Identified by q1, q2, n1, n2, and by i 1,1 、i 1,2 express.

[0113] M v The FD basis vectors are passed through M initial ∈{-2M v+1, -2M v +2,...,0},n 3,l =[n 3,l （0） ,...,n 3,l （M_v-1） ]、n 3,l （f） ∈{0,1,...,N3-1} is identified.

[0114] The elements of the FD basis vectors (FD basis) for the index t=0, 1, ..., N3-1 and layer l=1, ..., v associated with the precoding matrix (subband) are y t,l （f） =exp(j2πtn 3,l （f） / N3). In M v Among the FD basis vectors, the index f=0,1,...,M associated with the FD basis vector v The FD basis vectors of -1 are [y 0,l （f） ,y 1,l （f） ,...,y N_3-1,l （f） ] T .

[0115] Matrix W 2,l Each row of represents the channel frequency response of a specific SD beam. When the SD beam has high directivity, the channel tap of each beam is limited (the power delay distribution in the time domain becomes sparse). As a result, the channel frequency response of each SD beam has a high correlation (close to flat in the frequency domain). In this case, the channel frequency response can be approximated by the linear coupling of a small number of FD basis vectors. For example, in M v = 2, use the FD basis vectors f2, f q and LC coefficient d1 0 d2 0 The frequency response associated with SD beam b0 is given by d1 0 f2+,d2 0 f q Approximate representation.

[0116] Select the dominant M v FD basis vectors. By setting M v ≪N3, W ~ l The cost and W 2,l Compared with the overhead, it is quite small. vAll or part of the FD basis vectors are used to approximate the frequency response of each SD beam. A bitmap is used to report only the FD basis vectors selected for each SD beam. If the bitmap is not reported, all FD basis vectors are selected for each SD beam. In this case, the NZC of all FD basis vectors is reported for each SD beam. The number of NZCs in one layer K is l NZ ≤K0=ceil(β×2LM v ), the number of NZCs across all layers K NZ ≤2K0=ceil(β×2LM v ). β is set by the high-level layer.

[0117] In the enhanced type 2 codebook of Rel.16, L, β, p v The value of (combination of codebook parameters, parameter combination) is determined by the higher-layer parameter paramCombination-r16 (codebook combination setting).

[0118] Rel. 16 Type 2 CSI feedback on the PUSCH consists of two parts. CSI Part 1 has a fixed payload size and is used to identify the number of information bits in CSI Part 2. The size of Part 2 is variable (the UCI size depends on the number of NZCs, which is unknown to the base station). The UE reports the number of NZCs in CSI Part 1, which determines the size of CSI Part 2. After receiving CSI Part 1, the base station identifies the size of CSI Part 2.

[0119] In the enhanced type 2 CSI feedback of Rel.16, CSI part 1 contains RI (if reported), CQI, and an indicator of the total number of non-zero amplitude coefficients across multiple layers for enhanced type 2 CSI. RI (if reported), CQI, and an indicator of the total number of non-zero amplitude coefficients across multiple layers are coded separately as fields of part 1. CSI part 2 contains the PMI for enhanced type 2 CSI. Parts 1 and 2 are coded separately. CSI part 2 (PMI) contains at least one of the following: oversampling factor, index of the SD (2D-DFT) basis, index M of the initial FD (DFT) basis vector (starting offset) of the selected DFT window initial , the FD basis selected for each layer, the NZC (amplitude and phase) of each layer, the strongest coefficient indicator (SCI) of each layer, and the amplitude of the strongest coefficient for each layer / each polarization.

[0120] Multiple PMI indices (PMI values, codebook indices) associated with different CSI part 2 information may also follow the following for the lth layer.

[0121] -i 1,1 : Two-dimensional oversampling factor [q1 q2]. q1∈{0,1,...,O1-1}, q2∈{0,1,...,O2-1}.

[0122] -i 1,2 : Multiple indices of SD 2D-DFT basis (SD beam). i 1,2 ∈{0,1,...,C(N1N2,L)-1}.

[0123] -i 1,5 : Codebook indicator. Index of the FD DFT basis of the selected DFT window. i 1,5 ∈{0,1,...,2M v -1}.

[0124] -i 1,6,l : Codebook indicator. FD DFT basis selected for the lth layer. In the case of N3≤19, i 1,6,l ∈{0,1,...,C(N3-1,M v -1)-1}. In the case of N3>19, i 1,6,l ∈{0,1,...,C(2M v -1,M v -1)-1}.

[0125] -i 1,7,l : Bitmap indicator for layer l. Non-zero bits in this bitmap identify i 2,4,l and i 2,5,l Which coefficients are reported within i 1,7,l =[k l,0 （3） ... k l,M_v-1 （3） ]、k l,f （3） =[k l,0,f （3） ... k l,M_v-1,f （3） ]、k l,i,f （3） ∈{0,1}.

[0126] -i 1,8,l : The strongest coefficient indicator for the lth layer (the largest element k in the amplitude coefficient indicator l,i,f （2） ).

[0127] -i2,3,l : Amplitude coefficient indicator of the coefficient (broadband) of the l-th layer (both polarizations). i 2,3,l =[k l,0 （1） k l,1 （1） ].

[0128] -i 2,4,l : Amplitude coefficient indicator of the reported coefficient (subband) of the lth layer. i 2,3,l =[k l,0 （2） ...k l,M_v-1 （2） ].

[0129] -i 2,5,l : Phase coefficient indicator of the reported coefficient (subband) of the lth layer. i 2,5,l =[c l,0,f ...c l,M_v-1,f ].

[0130] f l * ∈{0,1,...,M v -1} is set to i 2,4,l The index of i l * ∈{0,1,...,2L-1} is set to k l,f_l^* （2） The index of the f l * and i l * Identify the strongest coefficient for layer l=1,...,v, ie, i for layer l 2,4,l The element k l,i_l^*,f_l^* （2） . Codebook index n 3,l About n 3,l （f_l^*） Remapped to n 3,l （f） =(n 3,l （f） -n 3,l （f_l^*） ) mod N3, becomes n after remapping 3,l （f_l^*） = 0. Index f with respect to f l * is remapped to f = (ff l * ) mod M v , which becomes f after remapping l* =0 (l=1,...,v). i 2,4,l 、i 2,5,l and i 1,7,l Respectively represent the remapped, amplitude coefficient, phase coefficient, and bitmap. 1,8,l The strongest coefficient of layer l, identified by ∈{0,1,...,2L-1}, for v=1 is provided as i 1,8,l =Σ i＝0 i_1^* k l,i,0 （3） -1, for 1<v≤4 is provided as i 1,8,l =i l * .

[0131] W ~ l The reported LC coefficients (complex coefficients) are the amplitude and phase of the quantized components.

[0132] - Amplitude quantization

[0133] The polarization specific reference amplitude is used Figure 1 Table (Amplitude coefficient indicator i 2,3,l Mapping of elements within: Amplitude coefficient indicator element k l,p （1） To the amplitude coefficient p l,p （1） According to the table, p l （1） =[p l,0 （1） p l,1 （1） ] is quantized as [k l,0 （1） k l,1 （1） ]、k l,p （1） ∈{0,...,15}. All other coefficients are Figure 2 Table (Amplitude coefficient indicator i 2,4,l Mapping of elements within: Amplitude coefficient indicator element k l,i,f （2） To the amplitude coefficient p l,i,f （2） According to the table, p l （2） =[p l,0 （2） ... p l,M_v-1 （2） ]、p l,f （2） =[pl,0,f （2） ... p l,2L-1.f （2） ] is quantized to k l,f （2） =[k l,0,f （2） ... k l,2L-1.f （2） ]、k l,i,f （2） ∈{0,...,7}.

[0134] - Phase quantization

[0135] Amplitude factor indicator i 2,5,l Elements within (amplitude coefficient indicator elements) [c l,0 ... c l,M_v-1 ] is reported by the UE (using 4 bits). All phase coefficients are quantized using 16-PSK. The quantity used for phase matching φ l,i,f =exp(j2πc l,i,f / 16) is quantized to c l,f =[c l,0,f ... c l,2L-1.f ]、c l,i,fi ∈{0,...,15}.

[0136] Amplitude coefficient indicator element k corresponding to the strongest coefficient of layer l l,floor（i_l^* / L） （1） = 15 (maximum), amplitude coefficient indicator element k l,i_l^*,0 （2） =7 (maximum), phase coefficient indicator element c l,i_l^*,0 （2） =0 (minimum value). For l=1,...,v,k l,floor（i_l^* / L） （1） 、k l,i_l^*,0 （2） 、c l,i_l^*,0 （2） =0 is not reported.

[0137] i 1,5 and i 1,6,l Is the PMI index used for FD DFT basis reporting. Only when N3>19, i 1,5 was reported.

[0138] From 3000 to 2999 + P CSI-RS The matrix W used in the codebook representation of the v (=1 to 4) layer CSI report （v） For layer l (=1 to v), based on the matrix W represented by the following formula l .

[0139]

[0140] Here, beam index i=0, 1, ..., L-1, m1 （i） =O1n1 （i） +q1,m2 （i） =O2n2 （i） +q2,n1 （i） ∈{0,1,...,N1-1}, n2 （i） ∈{0,1,...,N2-1}. v m_1^（i）,m_2^（i） represents the SD 2D-DFT basis, p l,0 （1） 、p l,i,f （2） represents the amplitude coefficient, φ l,i,f Thus, the codebook for each layer includes the strongest coefficient for each polarization, the amplitude coefficient for each FD-DFT basis and each SD-DFT basis for each polarization, and the phase coefficient for each FD-DFT basis and each SD-DFT basis for each polarization.

[0141] As a grouping of CSI part 2, for the provided CSI report, the PMI information is aggregated into 3 groups (groups 0 to 2). This is important in case of CSI omission. Index i 2,4,l 、i 2,5,l 、i 1,7,l Each element reported is associated with a specific priority rule. Groups 0 to 2 follow the following.

[0142] - Group 0: index i 1,1 、i 1,2 、i 1,8,l (l=1,...,v)

[0143] - Group 1: Index i (when reported) 1,5 , index i (when reported) 1,6,l 、i 1,7,l The highest (upper) v2LM within 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)

[0144] -Group 2:i1,7,l The lowest (lower) floor (K NZ / 2) priority elements, i 2,4,l The lowest (lower) floor (K NZ / 2) priority elements, i 2,5,l The lowest (lower) floor (K NZ / 2) priority elements (l=1,...,v)

[0145] In Type 1 CSI, an SD beam represented by an SD DFT vector is transmitted toward the UE. In Type 2 CSI, L SD beams are linearly coupled and transmitted toward the UE. Each SD beam can be associated with multiple FD beams. For each SD beam, a linear combination of their FD basis vectors yields a channel frequency response. This channel frequency response corresponds to a power delay profile.

[0146] (Type 2 port selection codebook / enhanced (Rel.16) / additional enhanced (Rel.17))

[0147] - Type 2 port selection codebook

[0148] In Rel. 15 Type 2 Port Selection (PS) CSI (Type 2 PS codebook), the UE does not need to consider 2D-DFT to derive SD beams, as required for Type 2 CSI. The base station considers a set of SD beams and transmits CSI-RS using K beamformed CSI-RS ports. The UE selects / identifies the best L (≤ K) CSI-RS ports per polarization and reports their indices within W1. Rel. 15 Type 2 PS CSI supports ranks 1 and 2.

[0149] - Enhanced Type 2 port selection codebook

[0150] The operation of Rel.16 Type-2 PS CSI (enhanced Type-2 PS codebook) is the same as Rel.16 Type-2 CSI except for the selection of SD beam. Rel.15 Type-2 PS CSI supports ranks 1 to 4.

[0151] For layer l∈{1,2,3,4}, the subband (SB)-wise precoder generation is given by the following equation.

[0152] W l (N t × N3) = QW1W ~ l W f,l H(H1)

[0153] Here, Q(N t ×K) represents K SD beams used for CSI-RS beamforming. W1 (K×2L) is a block diagonal matrix. ~ l (2L×M) is the LC coefficient matrix. W f,l (N3×M) is a matrix consisting of M vectors (FD basis vectors), each of which contains N3 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}. In P CSI-RS When >4, L∈{2,3,4}.

[0154] In Rel.15 / 16 type 2 PS CSI, each CSI-RS port #i is associated with the SD beam (b i ) to associate ( Figure 3A as well as Figure 3B ).

[0155] The Type 2 PS CSI of Rel.16 is similar to the Type 2 CSI of Rel.16 by increasing the number of FD basis vectors from N3 to M. v Cut (M v ≪N3), thereby reducing overhead compared to Rel.15 Type 2 PS CSI.

[0156] - Added enhanced type 2 port selection codebook

[0157] In the Type 2 PS CSI / codebook (further enhanced Type 2 PS codebook) of Rel. 17, each CSI-RS port #i is paired with an SD-FD beam pair (SD beam b) instead of an SD beam. i and FD beam f i,j (j is the frequency index)) to associate ( Figure 4A as well as Figure 4B In this example, ports 3 and 4 are associated with the same SD beam and different FD beams.

[0158] By pre-compensating the delay (delay pre-compensation), the frequency selectivity of the channel frequency response observed by the UE based on the SD beam-FD beam pair can be reduced compared to the frequency selectivity of the channel frequency response observed by the UE based on the SD beam.

[0159] The primary scenario for the Rel.17 Type 2 PS codebook is FDD. Channel reciprocity based on SRS measurements is incomplete (the UL beam and DL beam angles may differ, the UL frequency and DL frequency may differ in FDD, and the effective antenna spacing between the UL and DL frequencies may differ). However, the base station can obtain / select some partial information (dominant angles and delays (SD beam and FD beam)). In addition to CSI reporting, the base station uses SRS measurements to obtain CSI for DL ​​MIMO precoder decisions. In this case, some CSI reports can be omitted to reduce CSI overhead.

[0160] Figure 5 An example of parameter combination for Rel.16 type 2 codebook is shown. L is the number of SD basis vectors. v is the number M of FD basis vectors for rank v v =ceil(p v β is a parameter used to calculate the maximum number of NZCs.

[0161] In the additional enhanced type 2 PS codebook of Rel.17, the values ​​of α, M, and β (a combination of codebook parameters, parameter combination) are determined by the higher-layer parameter paramCombination-r17 (codebook parameter setting). Figure 6 An example of parameter combinations for the additional enhanced type 2 PS codebook of Rel. 17 is shown. α is the number of selected CSI-RS ports in the PS codebook. K1 = αP CSI-RS The calculation parameter of M is the number of FD basis vectors. β is the parameter used to calculate the maximum number of NZCs. The precoding matrix represented by PMI is determined based on L+M vectors. Here, L=K1 / 2, K1=αP CSI-RS .

[0162] In the enhanced type 2 PS CSI added in Rel. 17, each CSI-RS port is beamformed using an SD beam and FD basis vectors. Each port is associated with an SD-FD pair.

[0163] For the provided layer 1, the UE may also report information based on the following formula.

[0164] W l (K×N3) = W1W ~ l W f,l H (H2)

[0165] For W1 (K×2L), each matrix block consists of L columns of a K×K identity matrix. The base station transmits K beamformed CSI-RS ports. Each port is associated with an SD-FD pair. The UE selects L ports out of the K and uses them as the PMI (W 1,l ) is reported to the base station. In addition, in Rel.16, each port is associated with an SD beam.

[0166] W ~ l (2L×M v ) is a matrix of coupling coefficients (subband complex LC coefficients). A maximum of K0 NZCs are reported. The report consists of a bitmap capturing the NZC positions and a quantized NZC.

[0167] In the additional enhanced type 2 PS CSI of Rel.17, K l NZ =Σ i＝0 k1-1 Σ f＝0 M-1 k l,i,f （3） ≤K0 is the number of non-zero coefficients in layer l=1,...,v, K NZ =Σ l＝1 v K l NZ ≤2K0 is the total number of non-zero coefficients. NZ =K1Mv, for layer l=1,...,v, i 1,7,l (Bitmap indicator for layer 1) is not reported. That is, the total number of reported NZCs is equal to the maximum number of K1Mv, and when v ≤ 2, reporting of the bitmap indicating the positions of NZCs is omitted. In addition, in Rel. 16, the bitmap indicating the positions of NZCs is always reported.

[0168] W f,l (N3×M v ) is for each layer by M v (M v =1 or 2) FD basis vectors. Each vector contains N3 FD basis (FD-DFT basis). The base station can also delete W f,l In M v =1, W f,l If disabled (OFF), the additional FD basis vectors are not reported. v =2, W f,l To enable (ON), M v Additional FD basis vectors are reported.v = 2, the window size N∈{2,4} of the FD basis is set by the high-level parameter (valueOfN). In addition, in Rel.16, W f,l Always reported.

[0169] (JT)

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

[0171] Rel. 17 supports non-coherent joint transmission (NCJT) from two TRPs. The PDSCHs from the two TRPs can be independently precoded and decoded. Frequency resources can be non-overlapping, partially overlapping, or fully overlapping. In the event of overlap, the PDSCH from one TRP interferes with the PDSCH from the other TRP.

[0172] In Rel. 18, support for coherent joint transmission (CJT, mTRP CJT) using up to four TRPs is being studied. Data from the four TRPs can also be coherently precoded and transmitted to the UE on the same time-frequency resources. For example, considering the channels from the four TRPs, the same precoding matrix can also be used. "Coherent" can also mean that there is a certain relationship between the phases of the multiple received signals. 4TRP joint precoding can also be used to improve signal quality, and there can be no interference between the four TRPs. The data can also be subject to interference only outside the four TRPs.

[0173] (NCJT CSI)

[0174] In Rel. 17, NCJT CSI reporting can be applied in single-DCI MTRP NCJT with a Type 1 single-panel codebook. For NCJT CSI measurements, two channel measurement resource (CMR) groups can be configured within a single CSI-ReportConfig, along with their respective CMRs from a TRP. A single CSI reporting mode can be selected from two modes.

[0175] CSI-ReportConfig for Rel.17 non-coherent joint transmission (NCJT) CSI sets the CMR and CSI reporting mode (csi-ReportMode) through RRC signaling.

[0176] The accompanying K is set by the UE s = two CMR groups of K1 + K2 CMRs. 2≤K s ≤8.K s CMRs correspond to the NZP-CSI-RS resource set for channel measurement. K1 and K2 are the number of CMRs in the two CMR groups. The upper layer sets N (N groups) of CMR pairs (resource pairs) by selecting from all possible pairs. Supports N = 1, K s =2. Support N max =2 is an optional function of UE. Support K S,max =X is an optional feature of the UE. Each CMR can contain a maximum of 32 CSI-RS ports, depending on the UE capability. Each CMR is associated with a CRI value.

[0177] The RRC signaling-based bitmap represents one CMR from each CMR group, thereby indicating the N (N = 1, 2) CMR pairs actually used for NCJT measurement. The UE uses CMRs in two CMR groups to measure a single TRP CSI for TRP1 and a single TRP CSI for TRP2, using N CMR pairs to measure NCJT CSI.

[0178] The UE selects one or more CSIs to report based on the mode (CSI reporting mode) configured by csi-ReportMode. csi-ReportMode indicates one of the following two modes: Mode 1 and Mode 2 (NCJT CSI mode).

[0179] - Mode 1

[0180] The UE can also be configured to report X CSIs associated with a single TRP measurement hypothesis and one CSI associated with an NCJT measurement hypothesis. X = 0, 1, or 2. When X = 2, the two CSIs are associated with two different single TRP measurement hypotheses with multiple CMRs from different multiple CMR groups. Support for X = 1 and 2 is an optional feature for UEs supporting Option 1.

[0181] - Mode 2

[0182] The UE is configured to report a CSI associated with the best one within the measurement conditions of NCJT and single TRP.

[0183] In Mode 1, the UE reports a total of X + 1 CSIs, including X (X = 0, 1, 2) single-TRP CSIs and 1 NCJT CSI. In Mode 2, the UE reports the best CSI (1 CSI) from all single-TRP CSIs and 1 NCJT CSI.

[0184] In a single CSI report, up to two single-TRP CSIs and one NCJT CSI (with mode 1 of X=2) can be reported. NCJT CSI includes one CRI, two RIs (with a joint RI index), two PMIs, two LIs, and one CQI (for up to 4 layers). Single-TRP CSI is the same as existing CSI, including one CRI, one RI / PMI / LI, and one or two CQIs (for up to 8 layers, one CQI per CW).

[0185] For the following scenarios, a new mapping order (table) of multiple fields within a CSI report is defined.

[0186] - Mapping order for wideband CSI in mode 1 with X=0. Wideband CSI is supported only for mode 1 with X=0, i.e., NCJT CSI.

[0187] -Mapping order of CSI part 1 for modes 1 and 2.

[0188] - Mapping order of CSI part 2 wideband for modes 1 and 2.

[0189] - Mapping order of CSI part 2 subbands for modes 1 and 2.

[0190] (CJT CSI)

[0191] In an ideal scenario (where the four TRPs are co-located (considered to be at the same location)), a joint estimation of the aggregated channel matrix H is possible, and the joint precoding matrix V can be fed back. However, the large-scale path losses of the four paths can sometimes differ significantly. The joint precoding matrix V, based on a constant module codebook, is inaccurate. In this case, per-TRP feedback and inter-TRP coefficients can be matched using the current NR Type 2 codebook.

[0192] For CJT with a maximum of four TRPs in FR1, the selection of the four TRPs can also be semi-static. Therefore, this selection, and the setting of the four CMRs (four CSI-RS resources) used for channel measurement, can also be semi-static. Dynamic indication of the four TRPs from the list of CSI-RS resources is also possible, but less likely.

[0193] The path losses from the four TRPs to the UE are different. Therefore, it is difficult to report only one aggregated CSI representing the joint channel matrix.

[0194] Considering the fallback operation to NCJT (ie, single TRP), also consider the CSI of each TRP (ie, single TRP CSI like NCJT CSI of Rel.17).

[0195] Research is underway to develop CSI acquisition for coherent joint transmission (CJT) in FR1 and up to four TRPs, assuming ideal backhaul, synchronization, and the same number of antenna ports across multiple TRPs. Research is underway to improve the Rel.16 / 17 Type 2 codebook for CJT multi-TRPs in FDD.

[0196] W1 (SD basis) / W for each TRP f (FD groups) can be the same or different. l (NZC) can also be different. W1 / W for each TRP f / W l Can be selected jointly or individually. f / W l Design, preferably for different scenarios with different options. φ Can be reported as a separate content or in W l These usage guidelines relate to configuration scenarios (e.g., intra-site multiple TRPs or inter-site multiple TRPs).

[0197] For example, the precoding matrix for 4-TRP CJT CSI (codebook) can also be composed of W1 / W for each TRP. f / W l The W1 for each TRP can be the same or different, and can be selected jointly or individually. l Can be different, can be selected together or individually.f They can be the same or different, and can be selected together or individually.

[0198] In the (Rel.18) type 2 codebook (codebook structure) for CJT multi-TRP (mTRP), at least one of the following modes (codebook mode, CJT CSI mode) may also be supported.

[0199] - Mode 1 is SD / FD basis selection per TRP / per TRP group. This allows independent FD basis selection across N TRPs / TRP groups. For example, the codebook structure is given by the following equation. Here, N is the number of TRPs or TRP groups.

[0200]

[0201] Mode 2 uses SD basis selection per TRP / per TRP group (port group or resource) and joint / common FD basis selection (across N TRPs / TRP groups). For example, the codebook structure is given by the following equation. Here, N is the number of TRPs or TRP groups.

[0202]

[0203] In these two modes, detailed designs such as parameter combination, basis selection, TRP (group) selection, reference amplitude, and W2 quantization method can also be shared.

[0204] (analyze)

[0205] The parameter combination framework for multi-TRP CJT CSI may also be different from the parameter combination framework for enhanced type 2 CSI of Rel. 16 and additional enhanced type 2 PS CSI of Rel. 17. In the parameter combination of multi-TRP CJT CSI, some parameters may be specific to a TRP and some parameters may be common to the TRP.

[0206] (Study #1)

[0207] In the improvement of the type 2 codebook for CJT mTRP, for N TRP The setting value of N, multiple values ​​related to SD basis selection (SD basis vector selection, number of SD basis vectors, number of beams L) L The set (list, candidate) of combinations (SD basis vector selection combination, SD basis selection combination) can also be set by the base station via high-layer (RRC) signaling. Each combination can also be N TRP L i The combination of values ​​{L1,...,L N_TRP Here, i=1,...,N TRP , Li Corresponding to TRP#i.

[0208] - In N L > 1, an indicator can also be used to report the set N in CSI part 1. L Multiple values ​​{L1,...,L N_TRP} combination. N L =1 can also be N supported by UE L One of multiple candidate values.

[0209] - According to the existing design, it is also possible to use CSI-RS / 2,L n ) code point set, indicating the SD basis selection for the nth (n=1,...,N) selected CSI-RS resource in CSI part 2. Here, in the improvement based on Rel.16, it can also be P CSI-RS =2*N1N2.

[0210] -For L n The multiple candidate values ​​supported for each parameter may also include the existing multiple candidate values, that is, the candidate values ​​{2, 4, 6} of L in the improvement based on Rel.16. In the improvement based on Rel.17, the base station may also set the corresponding candidate values ​​{α1, ..., α N_TRP}、L n =α n P CSI-RS / 2, α n = N of {1 / 2, 3 / 4, 1} L A collection of combinations.

[0211] In the additional enhanced type 2 PS CSI of Rel. 17, L is not directly set. Instead, α is set and L is calculated based on α.

[0212] According to the existing design, among all the selected N CSI-RS resources, an indicator selected from the set of O1O2 code points can also be used to indicate the SD-based oversampling group for each CSI-RS resource in CSI part 2.

[0213] Based on the enhanced type 2 CSI of Rel.16, the SD basis setting for the CSI of CJT mTRP can also be {L1,...,L N_TRP}. The base station can also set L for all TRPi iFor example, for four TRPs, multiple combinations of sets for all TRPs can also be set, such as {6,4,2,2}, {4,4,4,2}, {6,6,2,4}, {4,2,2,4}. The UE can also use an indicator to select / report a combination. The use of an N-bit bitmap for indicating TRP selection is under study.

[0214] Based on the additional enhanced type 2 PS CSI of Rel.17, the SD basis setting for CSI of CJT mTRP can also be {α1,...,α N_TRP}.

[0215] The number of FD basis vectors M in the type 2 codebook for CJT mTRP for mode 1 (CJT CSI mode 1) is being studied. v It is common across all N CSI-RS resources. v In Rel.16 and p v Associated, associated with M in Rel.17.

[0216] For mode 2 (CJT CSI mode 2), the number of FD basis vectors is different for multiple TRPs.

[0217] (Study #2)

[0218] In the improvement of the type 2 codebook for CJT mTRP, the selection of N CSI-RS resources by the UE is being studied and reported as part of the CSI report. Here, N∈{1,...,N TRP}.

[0219] - N is the number of coordinated CSI-RS resources (TRP). TRP It is the maximum number of coordinated CSI-RS resources (TRP) and is set by the base station via higher layer signaling.

[0220] - UE may also report N in CSI part 1 (UCI) in order to indicate the TRP selected by the UE for CSI reporting TRP Bitmap of bits. TRP The selection of N CSI-RS resources among the CSI-RS resources can also be performed by the N TRP For example, when N=4 TRPs are set and the UE selects the first and third TRPs, the UE may also report a bitmap indicating its selection

[1010] .

[0221] - Also supports N=N TRPThe limit setting can also be set by the base station via high-layer signaling. For example, when N=N TRP = 4 TRPs, the UE may also report CJT CSI assuming 4-TRP CJT. If this restriction is set, it is also possible not to report N TRP Bitmap of bits.

[0222] - This function can also be a UE optional function.

[0223] N TRP Candidate values ​​of can also be 1, 2, 3, and 4. One transmission hypothesis can also be reported, and the UE does not need to calculate the CSI for multiple transmission hypotheses.

[0224] The base station can also set the N TRP = one or more CMRs of 1, 2, 3, or 4. The number of TRPs selected by the UE may also be N∈{1,...,N TRP This means that only one TRP can be selected for reporting (single TRP CSI).

[0225] (Study #3)

[0226] In the improvement of the Type 2 codebook for CJT mTRP, in accordance with the existing specifications (Enhanced Type 2 in Rel.16 and Additional Enhanced Type 2 PS in Rel.17), research is underway to support a separate bitmap for each CSI-RS resource regarding the positions of non-zero coefficients (NZCs) represented by a bitmap for each layer.

[0227] The overall size of the bitmap is Σ n＝1 N B n Here, B n is the size of the bitmap for CSI-RS resource n.

[0228] Research is underway on a bitmap representing the locations of NZCs, using existing designs. This implies that the size of the bitmap for the selected CSI-RS resource n (B n ) = 2L n M v .

[0229] Study is underway to define the limit K0 on the maximum number of NZCs per layer jointly across all N CSI-RS resources (all N TRPs).

[0230] The limits on the total number of NZCs supported across all layers are under investigation. According to the current specification, the maximum number of NZCs is 2K0.

[0231] The bitmap for indicating the location of NZCs supports a bitmap for each TRP. The maximum number K0 of NZCs per layer is defined for all TRPs.

[0232] (Question #1)

[0233] In the enhancement of enhanced type 2 CSI based on Rel.16, L becomes a TRP specific setting {L1,...,L N_TRP In mode 1 (CJT CSI mode 1), p v And β is common to multiple TRPs. Therefore, consider defining {L1,...,L N_TRP} and {p v ,β}. However, in these tables, in {L1,...,L N_TRP}A combinations and {p v ,β}, and any combination can be set through NW, the number of possible combinations (A×B) increases, the reporting overhead for a specific combination also increases, and some combinations may be unnecessary. N_TRP} and {p v If such a relationship is unclear, there is a concern that throughput and communication quality may be reduced.

[0234] (Question #2)

[0235] In the enhancement of PS CSI type 2 based on Rel.17, α becomes a TRP specific setting {α1,...,α N_TRP}. Consider {α1,...,α N_TRP} and {M,β} based on the parameter combination setting of the additional enhanced type 2 PS CSI, separate tables are defined. However, in these tables, {α1,...,α N_TRP If any combination of {α1,...,α} can be set by NW, the number of possible combinations increases (M×N combinations), the reporting overhead for a specific combination also increases, and some combinations may be unnecessary. N_TRP If the relationship is unclear, there is a risk of causing a decrease in throughput and communication quality.

[0236] (Question #3)

[0237] In the enhancement of enhanced type 2 CSI based on Rel.16, L becomes a TRP specific setting {L1,...,L N_TRPIn mode 2 (CJT CSI mode 2), there is p v For multiple TRP different possibilities. v When it is common to multiple TRPs, the setting method can be the same as that in Mode 1. v If the setting method is unclear, there is a concern that throughput and communication quality may be reduced.

[0238] Therefore, the inventors of the present invention have conceived a method for setting parameters for CJT CSI.

[0239] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, each of the following embodiments (eg, each situation) can be used alone or in combination of at least two.

[0240] In the present disclosure, "A / B" and "at least one of A and B" may be replaced with each other. In addition, in the present disclosure, "A / B / C" may also mean "at least one of A, B, and C."

[0241] In the present disclosure, the words “notify,” “activate,” “deactivate,” “indicate,” “select,” “configure,” “update,” and “determine” may be used interchangeably. In the present disclosure, the words “support,” “control,” “controllable,” “operate,” and “operable” may also be used interchangeably.

[0242] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, fields, Information Elements (IEs), and settings may also be overwritten. In this disclosure, Medium Access Control (MAC) elements (CEs), update commands, and activation / deactivation commands may also be overwritten.

[0243] In the present disclosure, high-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (for example, positioning protocols (for example, NR Positioning Protocol A (NRPPa)) / LTE Positioning Protocol (LTE Positioning Protocol (LPP))) messages, etc.) or any one of them, or a combination thereof.

[0244] In the present disclosure, MAC signaling may include, for example, a MAC Control Element (MACCE) and a MAC Protocol Data Unit (PDU). Broadcast information may include, for example, a Master Information Block (MIB), a System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), and other system information (Other System Information (OSI)).

[0245] In the present disclosure, the physical layer signaling may also be, for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI)), etc.

[0246] In this disclosure, a b c , a_b^c can also be rewritten. In this disclosure, a b , a_b can also be rewritten. In this disclosure, a c , a^c can also be rewritten with each other. In the present disclosure, ceil(x), the ceiling function, and the ceiling function can also be rewritten with each other. In the present disclosure, floor(x), the floor function, and the floor function can also be rewritten with each other.

[0247] In the present disclosure, basis, DFT basis, basis vector, DFT basis vector can also be rewritten to each other. In the present disclosure, SD basis, SD-DFT basis, beam, SD beam, SD 2D-DFT vector, SD basis vector, beam index, i can also be rewritten to each other. In the present disclosure, L, Ln , SD beam number, beam number, and SD 2D-DFT vector number can also be replaced with each other. In the present disclosure, FD basis, FD-DFT basis, FD beam, FD basis vector, FD-DFT basis vector, FD basis vector index, and f can also be replaced with each other.

[0248] In the present disclosure, size (dimension), length, and number (quantity) can also be replaced with each other.

[0249] In the present disclosure, CSI, codebook, and PMI can also be rewritten.

[0250] In the present disclosure, TRP and CSI-RS resources can also be overwritten with each other.

[0251] (Wireless Communication Method)

[0252] In each embodiment, enhancements based on at least one of the following CSIs may overwrite each other: CJT CSI, Enhanced Type 2 CSI (Rel. 16), and Additional Enhanced Type 2 PS CSI (Rel. 17).

[0253] In each embodiment, index, parameter combination, parameter combination index, parameter combination setting (paramCombination), codebook parameter setting, connection, connection combination, connection index, and connection setting may be overwritten.

[0254] In each embodiment, the parameters, codebook parameters, L, L n 、p v 、p v,n , β, α, α n , M can also be rewritten.

[0255] In various embodiments, tables, multiple combination candidates, and multiple linked candidates may overwrite each other. In various embodiments, independent tables and independent parameter combinations may overwrite each other. In various embodiments, joint tables and joint parameter combinations may overwrite each other. In various embodiments, linked tables and parameter combination links may overwrite each other.

[0256] In each embodiment, the mode, codebook mode, and CJT CSI mode may be overwritten with each other.

[0257] In various embodiments, the first parameter, L, L n In each embodiment, the second parameter, p v 、p v,n In each embodiment, the third parameter, α, α nIn each embodiment, the fourth parameter and β may also be overwritten. In each embodiment, the fifth parameter and M may also be overwritten.

[0258] <Implementation Method #0>

[0259] This embodiment relates to problem #1 and relates to {L1, ..., L N_TRP} combination.

[0260] like Figure 7A as well as Figure 7B As in the example, {L1,...,L N_TRP} multiple combinations and {p v Multiple combinations of ,β} can also be defined through separate tables (independent tables).

[0261] In the case of {L1,...,L N_TRP} table (L n Among multiple combination candidates), L n (N∈{1,...,N TRP}) can also be {2,4} or {2,4,6}. n The candidate values ​​of can be defined in the specification or can be set depending on the UE capability report.

[0262] UE can also report L n The supported values ​​may be, for example, {2,4} or {2,4,6}. The UE may also report {L1,...,L N_TRP}. The UE may also report the capabilities associated with the supported combined values ​​of L n The maximum value (supported value) of the total of the capabilities associated with L n The sum of can also be Σ n＝1 N_TRP L n .

[0263] - Example 0-1

[0264] Figure 8A Show L n Example 0-1 of multiple combination candidates (independent tables). In this example, N TRP =4,L n The candidate values ​​for are {2,4}.

[0265] - Example 0-2

[0266] Figure 8B Show L n Example 0-2 of multiple combination candidates (independent tables). In this example, NTRP =4,L n The candidate values ​​for are {2,4,6}.

[0267] In these examples, for an index value, the associated L n You can also set a value of the index to set L n A combination of.

[0268] According to this embodiment, the UE can be appropriately configured with L n combination.

[0269] <Implementation Method #1>

[0270] This embodiment relates to problem #1 and relates to {L1, ..., L N_TRP} and {p v ,β} combination.

[0271] We can also define {L1,...,L N_TRP ,p v ,β}. It is also possible to define {L1,...,L N_TRP} and {p v ,β}. Some combinations within the M×N combinations may not be included in the table, while P combinations within the M×N combinations are included in the table.

[0272] - Example 1-1

[0273] Figure 9A Show {L1,...,L N_TRP ,p v ,β} is an example of multiple combination candidates (joint table). In this example, N TRP =4, the number of index values ​​is P. In this example, for a value of an index, the association {L1,...,L N_TRP ,p v ,β}.

[0274] [Variation 1 of Implementation #1]

[0275] We can also define {L1,...,L N_TRP} and {p v ,β} is an independent table. {L1,...,L N_TRP} and {p v ,β} can also be defined by other tables (contact tables). Different contact tables can be defined in the specification or set for different UE capabilities. For example, L nThe candidate value of may also depend on the UE capability and may be {2,4} or {2,4,6}.

[0276] - Example 1-2

[0277] Figure 9B Show {L1,...,L N_TRP} and the index of the combination of {p v ,β}. In this example, for each link index, {L1,...,L N_TRP} and {p v ,β}. Furthermore, the index of {L1,...,L in implementation #0 can also be defined. N_TRP}'s independent table and {p v ,β} of at least one independent table.

[0278] When multiple contact tables are defined for different UE capabilities, for example, the contact table may also include the index in the table of the aforementioned example 0-1 and the index corresponding to the candidate value {2, 4} in the table of the aforementioned example 0-2.

[0279] In the case where multiple contact tables are defined for different UE capabilities, for example, the contact table may also include the index in the table of the aforementioned example 0-2.

[0280] [Variation 2 of Implementation #1]

[0281] In the NW is set L n In the case of a combination of N_TRP} combination of multiple settings and a {p v ,β}. For example, NW can set {L1,...,L N_TRP}. X can be defined in the specification or depend on UE capability reports. This is because in the aforementioned study #1, the number of SD basis vectors for multiple TRPs can be selected / reported by the UE.

[0282] For {p v ,β}, we can also define the index / row of each combination of {L1,...,L N_TRP} is an index of the allowed combinations.

[0283] - For {p v ,β} combination index = 1, {L1,...,L N_TRP The allowed combination indexes of} can also be 1, 2, 3, 5, 6, 8.

[0284] - For {pv ,β} combination index = 2, {L1,...,L N_TRP The allowed combined indexes of} can also be 3, 5, 7, and 9.

[0285] - In the case of defining a contact table, for each index / row of the contact table, for {p v ,β}, there may also be {L1,...,L N_TRP} multiple values ​​of the combined index.

[0286] Figure 9C Show {L1,...,L N_TRP} and the index of the combination of {p v ,β}. In this example, for one link index, {L1,...,L N_TRP} multiple indexes and {p v ,β} is associated. NW can also set {L1,...,L N_TRP} multiple combinations and {p v ,β}, and selects / sets / indicates a set {L1,...,L N_TRP}. You can also define the implementation #0, {L1, ..., L N_TRP}'s independent table and {p v ,β} of at least one independent table.

[0287] According to this embodiment, the UE can be appropriately configured with L n 、p v , β combination.

[0288] <Implementation Method #2>

[0289] This embodiment relates to problem #1 and relates to the enhancement of enhanced type 2 CSI based on Rel.16 for {L1, ..., L N_TRP} and {p v ,β} at least one restriction.

[0290] For the values ​​indicated by at least one table of embodiment #0 / #1, a restriction on the number of CSI-RS ports to be applied may be added. This restriction may be, for example, P CSI-RS ={4,8,12,16,24,32}.

[0291] - At least one of the following may also be applied to P CSI-RS A specific range of values ​​for {L1,...,L N_TRP} a specific range of indexes within a table, for {p v ,β}, and a specific range of indices in the linked table. For example, only {L1,...,L N_TRP} combination index = 1-4 is applied to P CSI-RS ≤16.

[0292] - Specific ranges of indexes within each table may not apply to P CSI-RS For example, {L1,...,L N_TRP} combination index = 1-4 may not be applied to P CSI-RS ≥24.

[0293] -L n 、p v , a specific candidate of β can be applied to P CSI-RS A specific range of values ​​may not apply to P CSI-RS For example, L n =6 may not be applied to P CSI-RS =32.

[0294] Several indices that represent large values ​​and incur high reporting overhead may also be applied only to P CSI-RS Smaller values ​​may not be applied to P CSI-RS The larger value of .

[0295] According to this embodiment, the UE can apply to {L1, ..., L N_TRP} and {p v ,β} is an appropriate value for at least one of them.

[0296] <Implementation Method #3>

[0297] This embodiment relates to problem #1 and relates to the enhancement of enhanced type 2 CSI based on Rel.16 for {L1, ..., L N_TRP}total value limit.

[0298] You can also add a target for {p v ,β} the value of L applied n The total value (Σ n＝1 N_TRP L n ) restrictions.

[0299] - For {p v ,β}, we can also define L n The maximum allowed total.

[0300] -- Figure 10A Show L n The total maximum value L max With {p v ,β} is an example of multiple connection candidates (connection table) between the combined indexes. In this example, L n The total maximum value L max is associated with {p v ,β} is a combined index.

[0301] -- For {p v ,β} in the table index 2-3, L n The maximum value allowed for the total of can also be 12. According to this restriction, it is also possible to pass {L1,...,L N_TRP}The index in the table represents L n When the total value of is less than 12, {p v ,β} in the table index 2-3 can be set, otherwise, {p v ,β} indices 2-3 in the table are not set (UE may not assume that {p v ,β} in the table index 2-3), can also be used with L n The total value of is greater than 12, corresponding to {p v ,β} is set to index 1 in the table.

[0302] - For {p v ,β}, we can also define L n The specific values ​​allowed for the total.

[0303] -- Figure 10B Show L n The total specific value Σ n＝1 N_TRP L n With {p v ,β} is an example of multiple connection candidates (connection table) between the combined indexes. In this example, L n A specific value of the sum Σ n＝1 N_TRP L n Associated with {p v ,β} is a combined index.

[0304] -- For {p v ,β} index 1-2 in the table, L n The total allowed specific value of can also include 12. According to this restriction, it is also possible to pass {L1,...,L N_TRP}The index in the table represents L n When the total value of is 12, {p v,β} can be set in the table index 1-2, otherwise, {p v ,β} indices 1-2 in the table are not set (UE may also not assume {p v ,β} is set in the table index 1-2), and can also be set with L n The total value of {p v ,β} in the table.

[0305] In this embodiment, {L1, ..., L in embodiment #0 can also be defined. N_TRP}'s independent table and {p v ,β} of at least one independent table.

[0306] Such restrictions can be defined in the specification or by specifying max} and {p v ,β} can be realized by combining or linking tables, or by n＝1 N_TRP L n} and {p v ,β} can be realized by the joint table or contact table.

[0307] According to this embodiment, the UE can appropriately determine the L based on the restriction. n 、p v , β.

[0308] <Implementation Method #4>

[0309] This embodiment relates to issue #1 and involves other limitations in the enhancement of enhanced type 2 CSI based on Rel.16.

[0310] For the index in at least one table in implementations #0 to #3, at least one of the following several restrictions may also be considered.

[0311] - Maximum or specific value of rank (per TRP or across multiple TRPs).

[0312] - The maximum value or specific value of the TRP number to be set.

[0313] - The maximum or specific value of R.

[0314] - The maximum or specific value of the number of FD basis vectors.

[0315] For each restriction in each embodiment, the UE capability associated with the (supported / allowed) maximum value of the restriction may also be imported / reported.

[0316] According to this embodiment, the UE can appropriately determine the L based on the restriction. n 、pv , at least one of β.

[0317] <Implementation method #5>

[0318] This embodiment relates to issue #2 and involves enhancement of the additional enhanced type 2 PS CSI based on Rel.17.

[0319] By putting {L1,...,L N_TRP} is rewritten as {α1,...,α N_TRP}, and {p v ,β} is rewritten as {M,β}, so that at least one of the embodiments #0 to #4 can also be applied to the enhancement of the additional enhancement type 2 PS CSI based on Rel.17.

[0320] By adding L n The total value (Σ n＝1 N_TRP L n ) is rewritten as α n The total value (Σ n＝1 N_TRP α n ), so implementation #3 can also be applied. n The total value (Σ n＝1 N_TRP L n ) is rewritten as the total value of the number of selected CSI-RS ports (P CSI-RS ×Σ n＝1 N_TRP α n ), implementation #3 may also be applied.

[0321] By considering a further restriction factor, embodiment #4 can also be applied. This restriction factor may be, for example, the FD basis selection window size N set by RRC. N may also be the same as valueOfN in the configuration (CodebookConfig) of the additional enhanced type 2 PS CSI in Rel.17.

[0322] According to this embodiment, the UE can be appropriately configured with α n , M, β.

[0323] <Implementation Method #6>

[0324] This embodiment relates to issue #3 and involves enhancements to enhanced type 2 CSI based on Rel.16.

[0325] p v It can also be different for multiple TRPs. In mode 2, p v It can also be different for multiple TRPs.

[0326] -Option 1

[0327] For {p v,1 ,...,p v,N_TRP}, you can also define a separate table (with L n , β different tables, independent tables).

[0328] In {L1,...,L N_TRP} and {p v,1 ,...,p v,N_TRP} and β, any combination setting, or linked table, or linked combination setting can also be set through RRC IE. N_TRP} and {p v, ,β} is rewritten as {L1,...,L N_TRP}、{p v,1 ,...,p v,N_TRP} and β, thereby applying the table / setting in variation 1 / 2 of implementation mode #1 to any combination setting, or linked table, or linked combination setting.

[0329] Figure 11A Shows the p involved in Option 1 of Implementation #6 v,n An example of an independent table. In this example, {p v,1 ,...,p v,N_TRP} is associated with an index.

[0330] Figure 11B An example of a contact table according to option 1 of embodiment #6 is shown. In this example, {p v,1 ,...,p v,N_TRP An index of the combination of} is associated with an index of β.

[0331] In this option, {L1, ..., L N_TRP} and at least one of the independent tables of β, you can also define {L1,...,L N_TRP ,β} of the (joint / independent) table.

[0332] -Option 2

[0333] For {p v,1 ,...,p v,N_TRP ,β}, it is also possible to define multiple combination candidates for the union (union table).

[0334] In {L1,...,L N_TRP} and {p v,1 ,...,p v,N_TRP,β}, any combination setting, or linked table, or linked combination setting can also be set through RRC IE. N_TRP ,p v, ,β} is rewritten as {L1,...,L N_TRP ,p v,1 ,...,p v,N_TRP, ,β}, thereby applying the table / setting in variation 1 / 2 of implementation #1 to any combination setting, or linked table, or linked combination setting. It is also possible to apply {L1,...,L N_TRP} and {p v, ,β} is rewritten as {p v,1 ,...,p v,N_TRP} and β, thereby applying implementation #1 to {p v,1 ,...,p v,N_TRP ,β} joint table.

[0335] Figure 12A Show p v,n An example of multiple combination candidates of , β. In this example, {p v,1 ,...,p v,N_TRP A combination of ,β} is associated with an index.

[0336] Figure 12B An example of multiple connection candidates is shown. In this example, {L1,...,L N_TRP An index of the combination of} is associated with {p v,1 ,...,p v,N_TRP ,β}. In {L1,...,L N_TRP} can also be applied to the independent table of implementation #0.

[0337] In this option, it is also possible to define {L1, ..., L N_TRP} independent table.

[0338] -Option 3

[0339] For {L1,...,L N_TRP ,p v,1 ,...,p v,N_TRP ,β}, it is also possible to define multiple combination candidates for the union (union table).

[0340] You can also use p v, Rewrite as {p v,1 ,...,p v,N_TRP}, thus applying implementation #1 to {L1,...,L N_TRP ,p v,1 ,...,p v,N_TRP,β} joint table.

[0341] Figure 13 An example of multiple combination candidates is shown. In this example, {L1,...,L N_TRP ,p v,1 ,...,p v,N_TRP A combination of ,β} is associated with an index.

[0342] According to this embodiment, the UE can be appropriately configured with multiple p for multiple TRPs. v .

[0343] <Implementation Method #7>

[0344] This embodiment relates to issue #3 and concerns limitations in enhancements to enhanced type 2 CSI based on Rel.16.

[0345] You can also use p v Rewrite as {p v,1 ,...,p v,N_TRP}, thereby applying the limitations of at least one of implementations #2 to #4.

[0346] According to this embodiment, the UE can appropriately determine the L based on the restriction. n 、p v,n , at least one of β.

[0347] Supplementary information

[0348] [Notification of information to UE]

[0349] Any information in the above-mentioned embodiments (notification from the network (Network (NW)) (e.g., base station (BaseStation (BS)))) to the UE (in other words, reception of any information from the BS in the UE) can also be carried out using physical layer signaling (e.g., DCI), high-layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PDCCH, PDSCH, reference signals), or a combination thereof.

[0350] When the notification is performed through a MAC CE, the MAC CE may be identified by including a new logical channel ID (LCID) not specified in existing standards in a MAC subheader.

[0351] In the case where the above-mentioned notification is performed through DCI, the above-mentioned notification may also be performed through a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used for scrambling of a Cyclic Redundancy Check (CRC) bit assigned in the DCI, the format of the DCI, and the like.

[0352] In addition, notification of any information in the above-mentioned embodiments to the UE may be performed periodically, semi-continuously, or aperiodically.

[0353] [Notification of information from UE]

[0354] The notification of arbitrary information from the UE (to the NW) in the above-mentioned embodiment (in other words, the sending / reporting of arbitrary information from the UE to the BS) can also be carried out using physical layer signaling (e.g., UCI), high-layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0355] When the above notification is performed through MAC CE, the MAC CE can also be identified by including a new LCID that is not specified in the existing standards in the MAC subheader.

[0356] When the notification is performed through UCI, the notification may be sent using PUCCH or PUSCH.

[0357] Furthermore, the notification of arbitrary information from the UE in the above-mentioned embodiments may be performed periodically, semi-continuously, or aperiodically.

[0358] [Regarding the application of each embodiment]

[0359] At least one of the above embodiments may also be applied when a specific condition is met, which may be specified in a standard or notified to the UE / BS using higher layer signaling / physical layer signaling.

[0360] At least one of the above-mentioned embodiments may also be applied only to UEs that report a specific UE capability or support the specific UE capability.

[0361] The specific UE capability may also indicate at least one of the following:

[0362] -Support specific processing / operation / control / information for at least one of the above embodiments.

[0363] - Support of Doppler CSI based on at least one of enhanced type 2 CSI (Rel. 16) and additional enhanced type 2 PS CSI (Rel. 17).

[0364] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied throughout all frequencies (commonly regardless of frequency), or capabilities for each frequency (for example, one or a combination of cells, bands, band combinations, BWPs, component carriers, etc.), or capabilities for each frequency range (for example, Frequency Range 1 (FR1)), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities for each subcarrier spacing (SubCarrier Spacing (SCS)), or capabilities for each feature set (Feature Set (FS)) or each component carrier (Feature Set Per Component-carrier (FSPC)).

[0365] Furthermore, the specific UE capability may be a capability that applies to all duplex modes (commonly regardless of the duplex mode) or a capability that applies to each duplex mode (eg, time division duplex (TDD) or frequency division duplex (FDD)).

[0366] Furthermore, at least one of the aforementioned embodiments may also be applied when specific information associated with the aforementioned embodiment is configured / activated / triggered by the UE through higher layer signaling / physical layer signaling (or the operation of the aforementioned embodiment is performed). For example, the specific information may be information indicating activation of the operation of the aforementioned embodiment, arbitrary RRC parameters for a specific release (e.g., Rel. 18 / 19), etc.

[0367] The UE may also apply Rel.15 / 16 operations, for example, when it does not support at least one of the above-mentioned specific UE capabilities or is not configured with the above-mentioned specific information.

[0368] (Note)

[0369] The following inventions are added to one embodiment of the present disclosure.

[0370] [Note 1]

[0371] A terminal having:

[0372] a receiving unit for receiving indices for channel state information (CSI) reports of a plurality of transmission / reception points (TRPs) for coherent joint transmission (CJT); and

[0373] A control unit determines a plurality of values ​​based on the index, the plurality of values ​​being a plurality of values ​​of one of the following parameters, and being a plurality of values ​​corresponding to the plurality of TRPs, respectively: a first parameter related to the number of beams, a second parameter for calculating the number of frequency-domain discrete Fourier transform (DFT) vectors, and a third parameter for calculating the number of selected CSI-reference signal (RS) ports.

[0374] [Note 2]

[0375] The terminal as described in Supplement 1, wherein:

[0376] The index corresponds to one of a plurality of candidates for a combination including the plurality of values ​​of the first parameter, one or more values ​​of the second parameter, and a value of a fourth parameter for calculation of a maximum number of non-zero coefficients.

[0377] [Note 3]

[0378] The terminal as described in Supplement 1 or Supplement 2, wherein:

[0379] The index corresponds to one of a plurality of candidates including a combination of the plurality of values ​​of the third parameter, a value of a fourth parameter for calculation of a maximum number of non-zero coefficients, and a value of a fifth parameter representing the number of frequency-domain DFT vectors.

[0380] [Note 4]

[0381] A terminal as described in any one of Notes 1 to 3, wherein:

[0382] The control unit determines at least one of the following based on a relationship between the plurality of values ​​and the one or more parameters: the plurality of values ​​and the one or more parameters.

[0383] (Wireless Communication System)

[0384] The following describes a configuration of a wireless communication system according to an embodiment of the present disclosure. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

[0385] Figure 14 This figure shows an example of a schematic configuration of a wireless communication system according to one embodiment. Wireless communication system 1 (also referred to simply as system 1) may be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), fifth-generation mobile communication system New Radio (5G NR), or the like.

[0386] In addition, the wireless communication system 1 may also support dual connectivity between multiple radio access technologies (Radio Access Technologies (RATs)) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0387] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0388] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both the MN and the SN are NR base stations (gNB)).

[0389] The wireless communication system 1 may also include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are deployed within the macrocell C1 and form small cells C2 that are narrower than the macrocell C1. User terminals 20 may also be located within at least one of the cells. The arrangement and number of cells and user terminals 20 are not limited to those shown in the figure. Hereinafter, when not distinguishing between base stations 11 and 12, they are collectively referred to as base stations 10.

[0390] 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).

[0391] Each CC may also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). Macrocell C1 may also be included in FR1, and small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above 24 GHz (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also correspond to a frequency band higher than FR2.

[0392] 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.

[0393] Multiple base stations 10 may be connected via wired (e.g., optical fiber based on the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, base station 11, which functions as a host station, may be referred to as an Integrated Access Backhaul (IAB) donor, and base station 12, which functions as a relay station (relay), may be referred to as an IAB node.

[0394] The base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0395] The core network 30 may also include network functions (NFs), such as the User Plane Function (UPF), Access and Mobility Management Function (AMF), Session Management Function (SMF), Unified Data Management (UDM), Application Function (AF), Data Network (DN), Location Management Function (LMF), and Operation, Administration, and Maintenance (Management) (OAM). Furthermore, a single network node may provide multiple functions. Furthermore, communication with an external network (e.g., the Internet) may be performed via the DN.

[0396] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0397] In the wireless communication system 1 , a radio access scheme based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), or single carrier frequency division multiple access (SC-FDMA) may be used.

[0398] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1 , other radio access schemes (eg, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0399] In the wireless communication system 1 , downlink channels such as a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20 , a broadcast channel (Physical Broadcast Channel (PBCH)), and a downlink control channel (Physical Downlink Control Channel (PDCCH)) can be used.

[0400] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. can also be used as an uplink channel.

[0401] The PDSCH transmits user data, higher-layer control information, and the System Information Block (SIB). The PUSCH also transmits user data and higher-layer control information. The PBCH also transmits the Master Information Block (MIB).

[0402] The PDCCH may also transmit lower layer control information, which may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

[0403] In addition, the DCI that schedules the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0404] PDCCH detection also utilizes control resource sets (CORESETs) and search spaces. A CORESET corresponds to the resources used to search for DCI. A search space corresponds to the search area and search method for PDCCH candidates. A CORESET can be associated with one or more search spaces. The UE can also monitor the CORESETs associated with a search space based on the search space configuration.

[0405] A search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. Furthermore, the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" in this disclosure may be interchangeable.

[0406] The PUCCH can also transmit uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH can also transmit the random access preamble used to establish a connection with a cell.

[0407] In the present disclosure, terms such as downlink and uplink may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0408] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), and the like may also be transmitted. In the wireless communication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), and a phase tracking reference signal (PTRS) may also be transmitted as DL-RS.

[0409] For example, a synchronization signal may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SSs (PSS, SSS) and PBCHs (and DMRS for the PBCH) may also be referred to as an SS / PBCH block or an SS block (SSB). Furthermore, SSs and SSBs may also be referred to as reference signals.

[0410] In addition, wireless communication system 1 may also transmit a sounding reference signal (SRS) or a demodulation reference signal (DMRS) as an uplink reference signal (UL-RS). DMRS is also called a user terminal-specific reference signal (UE-specific Reference Signal).

[0411] (Base Station)

[0412] Figure 15 This figure illustrates an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission path interface (transmission line interface) 140. Furthermore, one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140 may be provided.

[0413] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, but it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0414] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

[0415] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. It may also control transmission, reception, and measurement using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be transmitted as signals and forward them to the transceiver unit 120. The control unit 110 may also perform call processing (e.g., setup and release) of communication channels, manage the status of the base station 10, and manage radio resources.

[0416] Transmitter / receiver unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. Baseband unit 121 may also include a transmit processing unit 1211 and a receive processing unit 1212. Transmitter / receiver unit 120 may include a transmitter / receiver, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmit / receive circuits, and the like, as described based on common knowledge in the technical fields involved in this disclosure.

[0417] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0418] The transmitting and receiving antenna 130 can be formed of an antenna described based on common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0419] The transmitting and receiving unit 120 may also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the aforementioned uplink channel, uplink reference signal, etc.

[0420] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0421] The transmitting and receiving unit 120 (transmitting processing unit 1211) may also perform processing on the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on the data and control information obtained from the control unit 110, to generate a bit string to be transmitted.

[0422] The transmitting and receiving unit 120 (transmitting processing unit 1211) may also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion, etc. on the bit sequence to be transmitted, and output a baseband signal.

[0423] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0424] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filtering, and demodulation into baseband signals on the radio frequency band signals received via the transmitting and receiving antenna 130 .

[0425] The transmitting and receiving unit 120 (receiving processing unit 1212) may also apply receiving processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0426] The transmitting / receiving unit 120 (measuring unit 123) may also perform measurements related to received signals. For example, the measuring unit 123 may perform radio resource management (RRM) measurements and channel state information (CSI) measurements based on the received signals. The measuring unit 123 may also 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)), and propagation path information (e.g., CSI). The measurement results may also be output to the control unit 110.

[0427] The transmission path interface 140 can also send and receive signals (return signaling) between the devices included in the core network 30 (for example, the network node providing NF), other base stations 10, etc., and can also obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0428] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0429] Furthermore, the transmitting / receiving unit 120 may also transmit a channel state information (CSI) report configuration including one or more parameters indicating at least one of a rank indicator restriction and a codebook subset restriction. The control unit 110 may also apply the one or more parameters to the coherent joint transmission of CSI and control the reception of the CSI report.

[0430] Furthermore, the control unit 110 may determine multiple values ​​for channel state information (CSI) reporting for multiple transmission / reception points (TRPs) used for coherent joint transmission (CJT), the multiple values ​​being multiple values ​​of one of the following parameters: a first parameter related to the number of beams; a second parameter for calculating the number of frequency-domain discrete Fourier transform (DFT) vectors; and a third parameter for calculating the number of selected CSI-reference signal (RS) ports, respectively corresponding to the multiple TRPs. The transmitting / receiving unit 120 may also transmit indexes corresponding to the multiple values.

[0431] (User Terminal)

[0432] Figure 16 This figure shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Furthermore, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0433] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0434] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

[0435] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission, reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals and forward them to the transmission and reception unit 220.

[0436] The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, and the like, which are described based on common knowledge in the technical fields involved in this disclosure.

[0437] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit or may be composed of a transmitting unit and a receiving unit. The transmitting unit may also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0438] The transmitting and receiving antenna 230 can be formed of an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0439] The transmitting and receiving unit 220 may also receive the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the aforementioned uplink channel, uplink reference signal, etc.

[0440] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0441] The transmitting and receiving unit 220 (transmitting processing unit 2211 ) may also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data and control information obtained from the control unit 210 to generate a bit sequence to be transmitted.

[0442] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output a baseband signal.

[0443] Furthermore, whether or not to apply DFT processing may also be determined based on the transform precoding configuration. For a particular channel (e.g., PUSCH), if transform precoding is enabled, the transceiver unit 220 (transmit processing unit 2211) may perform DFT processing as part of the aforementioned transmit processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transceiver unit 220 (transmit processing unit 2211) may perform DFT processing as part of the aforementioned transmit processing.

[0444] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0445] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 230 .

[0446] The transmitting and receiving unit 220 (receiving processing unit 2212) may also apply receiving processing such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0447] The transmitting / receiving unit 220 (measuring unit 223) may also perform measurements related to received signals. For example, the measuring unit 223 may also perform RRM measurements and CSI measurements based on the received signals. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), and other information. The measurement results may also be output to the control unit 210.

[0448] In addition, the measurement unit 223 may also derive channel measurements for CSI calculation based on channel measurement resources. Channel measurement resources may also be, for example, non-zero power (NZP) CSI-RS resources. In addition, the measurement unit 223 may also derive interference measurements for CSI calculation based on interference measurement resources. Interference measurement resources may also be at least one of NZP CSI-RS resources for interference measurement, CSI-Interference Measurement (IM) resources, and the like. In addition, CSI-IM may also be referred to as CSI-Interference Management (IM) and may be interchangeable with Zero Power (ZP) CSI-RS. In addition, in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeable.

[0449] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0450] Furthermore, the transmitting / receiving unit 220 may also receive indices for channel state information (CSI) reporting for multiple transmission / reception points (TRPs) used for coherent joint transmission (CJT). The control unit 210 may also determine, based on the indices, multiple values ​​corresponding to one of the following parameters: a first parameter related to the number of beams, a second parameter used for calculating the number of frequency-domain discrete Fourier transform (DFT) vectors, and a third parameter used for calculating the number of selected CSI-reference signal (RS) ports.

[0451] The index may also correspond to one of a plurality of candidates of a combination including the plurality of values ​​of the first parameter, one or more values ​​of the second parameter, and a value of a fourth parameter for calculation of the maximum number of non-zero coefficients.

[0452] The index may also correspond to one of multiple candidates of a combination including the multiple values ​​of the third parameter, a value of a fourth parameter for calculating the maximum number of non-zero coefficients, and a value of a fifth parameter representing the number of frequency-domain DFT vectors.

[0453] The control unit may also determine at least one of the following based on a relationship between the multiple values ​​and the one or more parameters: the multiple values ​​and the one or more parameters.

[0454] (Hardware structure)

[0455] Furthermore, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Furthermore, the implementation method of each functional block is not particularly limited. Specifically, each functional block can be implemented using a single device that is physically or logically combined, or by connecting two or more physically or logically separate devices directly or indirectly (e.g., by wired or wireless connections) to implement these multiple devices. A functional block can also be implemented by combining one or more of these devices with software.

[0456] Here, the term "function" includes, but is not limited to, judging, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. For example, a functional block (structural unit) that implements a transmitting function may also be referred to as a transmitting unit, a transmitter, or the like. Any of these terms are as described above, and their implementation methods are not particularly limited.

[0457] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 17 This figure shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. The base station 10 and user terminal 20 described above can also 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, and the like.

[0458] In this disclosure, the terms "device," "circuit," "equipment," "section," and "unit" are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figures, or may exclude some of the devices.

[0459] For example, although only one processor 1001 is shown, multiple processors may be provided. Furthermore, processing may be performed by a single processor, or by two or more processors simultaneously, sequentially, or using other methods. Furthermore, processor 1001 may be implemented using more than one chip.

[0460] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003.

[0461] Processor 1001 controls the entire computer by, for example, operating an operating system. Processor 1001 may also be comprised of a central processing unit (CPU) including interfaces with peripheral devices, a control device, a computing device, registers, and the like. For example, at least a portion of the aforementioned control unit 110 (210) and transceiver unit 120 (220) may also be implemented by processor 1001.

[0462] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes based on these programs. As a program, a program that causes a computer to execute at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and executed by the processor 1001, and the other functional blocks can also be implemented similarly.

[0463] Memory 1002 may also be a computer-readable recording medium, such as at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other suitable storage medium. Memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), or the like. Memory 1002 can store executable programs (program code), software modules, and the like for implementing the wireless communication method according to an embodiment of the present disclosure.

[0464] Storage 1003 may also be a computer-readable recording medium, such as at least one of a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, or 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.

[0465] The communication device 1004 is hardware (a transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network. For example, it is also referred to as a network device, a network controller, a network card, a communication module, etc. In order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the aforementioned transmitting and receiving unit 120 (220) and the transmitting and receiving antenna 130 (230) may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be implemented by a transmitting unit 120a (220a) and a receiving unit 120b (220b) that are physically or logically separated.

[0466] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). Alternatively, the input device 1005 and output device 1006 may be integrated (e.g., a touch panel).

[0467] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses for each device.

[0468] Furthermore, the base station 10 and user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and may use this hardware to implement part or all of each functional block. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0469] (Variation)

[0470] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be replaced with each other. In addition, a signal may also be a message. Reference Signal (RS) may also be referred to as RS, and may also be referred to as Pilot, Pilot Signal, etc. depending on the applied standard. In addition, Component Carrier (CC) may also be referred to as Cell, Frequency Carrier, Carrier Frequency, etc.

[0471] A radio frame can also be composed of one or more time periods (frames) in the time domain. Each of these one or more time periods (frames) that make up a radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (for example, 1ms) that is independent of the numerology.

[0472] Here, a parameter set may also refer to communication parameters applied to at least one of the transmission and reception of a signal or channel. For example, the parameter set may also represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0473] In the time domain, a slot can also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) Furthermore, a slot can also be a time unit based on a parameter set.

[0474] A time slot may also contain multiple mini-slots. Each mini-slot may also consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as PDSCH (PUSCH) mapping type B.

[0475] Radio frames, subframes, time slots, mini-slots, and symbols all represent time units used for signal transmission. Radio frames, subframes, time slots, mini-slots, and symbols may also be referred to by their respective equivalents. Furthermore, the time units of frame, subframe, time slot, mini-slot, and symbol in this disclosure may be interchangeable.

[0476] For example, a subframe can be called a TTI, multiple consecutive subframes can be called a TTI, and a slot or a mini-slot can be called a TTI. That is, at least one of a subframe and a TTI can 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. Furthermore, the unit representing a TTI can be called a slot, a mini-slot, or the like, rather than a subframe.

[0477] Here, TTI refers to, for example, the minimum time unit used for scheduling in wireless communications. For example, in the LTE system, a base station schedules each user terminal by allocating radio resources (such as the frequency bandwidth and transmit power available to each user terminal) in TTI units. The definition of TTI is not limited to this.

[0478] A TTI can also be a unit of time for transmitting channel-coded data packets (transport blocks), code blocks, code words, etc., and can also be a unit of processing for scheduling, link adaptation, etc. Furthermore, when a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0479] Furthermore, while a time slot or mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-slots) can also be the minimum time unit for scheduling. Furthermore, the number of time slots (mini-slots) that constitute this minimum time unit for scheduling can also be controlled.

[0480] A TTI with a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a time slot, etc.

[0481] In addition, a long TTI (e.g., normal TTI, subframe, etc.) can also be rewritten as a TTI with a time length exceeding 1ms, and a short TTI (e.g., shortened TTI, etc.) can also be rewritten as a TTI with a TTI length shorter than the long TTI and longer than 1ms.

[0482] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it may also include one or more consecutive subcarriers (subcarriers). The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined based on the parameter set.

[0483] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks.

[0484] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0485] 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.

[0486] A Bandwidth Part (BWP) (also referred to as a fractional bandwidth) can also represent a subset of contiguous common resource blocks (RBs) used for a particular parameter set within a carrier. Common RBs can also be identified by their index relative to the common reference point for that carrier. PRBs can also be defined within a BWP and numbered within that BWP.

[0487] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured within one carrier.

[0488] At least one of the configured BWPs may be activated, and the UE may not assume that it will transmit or receive specific signals / channels outside of the activated BWP. In addition, the terms "cell," "carrier," and the like in this disclosure may also be rewritten as "BWP."

[0489] The above-mentioned structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots within a slot, the number of symbols and RBs within a slot or mini-slot, the number of subcarriers within an RB, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length can be varied in various ways.

[0490] Furthermore, the information and parameters described in this disclosure may be expressed as absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may be indicated by specific indexes.

[0491] The names used for parameters, etc. in this disclosure are not intended to be limiting in any respect. Furthermore, the mathematical formulas for these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any respect.

[0492] Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referred to throughout the foregoing description may also be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

[0493] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0494] Input and output information, signals, etc. can be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc. can be overwritten, updated, or appended. Output information, signals, etc. can also be deleted. Input information, signals, etc. can also be sent to other devices.

[0495] The notification of information is not limited to the methods / implementations described in this disclosure and may also be performed using other methods. For example, the notification of information in this disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0496] In addition, physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), Layer 1 control information (L1 control signal), etc. Furthermore, RRC signaling may also be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, MAC signaling may also be notified using, for example, a MAC Control Element (CE).

[0497] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0498] The determination can be made using a value represented by a bit (0 or 1), a true or false value (Boolean value) represented by true or false, or a numerical comparison (eg, comparison with a specific value).

[0499] The term “software” or “firmware” shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0500] Furthermore, software, instructions, information, and the like may also be transmitted and received via a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), at least one of the wired technology and the wireless technology is included within the definition of a transmission medium.

[0501] The terms "system" and "network" used in this disclosure are interchangeable. "Network" may also refer to devices included in the network (eg, base stations).

[0502] 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", "layer", "number of layers", "rank", "resource", "resource set", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", "UE panel", "transmitting entity", and "receiving entity" can be used interchangeably.

[0503] Furthermore, in the present disclosure, antenna ports can be interchanged with antenna ports used for any signal / channel (e.g., Demodulation Reference Signal (DMRS) ports). In the present disclosure, resources can be interchanged with resources used for any signal / channel (e.g., reference signal resources, SRS resources, etc.). Furthermore, resources can include time / frequency / code / space / power resources. Furthermore, spatial domain transmit filters can include at least one of spatial domain transmission filters and spatial domain reception filters.

[0504] The above-mentioned group may also include, for example, at least one of a spatial relationship group, a code division multiplexing (CDM) group, a reference signal (RS) group, a control resource set (CORESET) group, a PUCCH group, an antenna port group (for example, a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, etc.

[0505] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. can also be rewritten.

[0506] In addition, in the present disclosure, TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state (unified TCI state), common TCI state (common TCI state), joint TCI state, etc. can also be rewritten with each other.

[0507] In addition, in the present disclosure, "QCL", "QCL concept", "QCL relationship", "QCL type information", "QCL characteristics (QCLproperty / properties)", "specific QCL type (e.g., type A, type D) characteristics", "specific QCL type (e.g., type A, type D)", etc. can also be rewritten with each other.

[0508] In the present disclosure, index, identifier (ID), indicator, indication, resource ID, etc. can also be overwritten with each other. In the present disclosure, sequence, list, set, group, cluster, subset, etc. can also be overwritten with each other.

[0509] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and spatial relationship information (TCI state) can also be overwritten. "Spatial relationship information (TCI state)" can also be overwritten with "a collection of spatial relationship information (TCI state)," "one or more spatial relationship information," and so on. TCI states and TCIs can also be overwritten. Spatial relationship information and spatial relationships can also be overwritten.

[0510] In this disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP))", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. In some cases, a base station may be referred to as a macrocell, small cell, femtocell, or picocell.

[0511] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the base station's overall coverage area can be divided into multiple smaller areas, each of which can be provided with communications services by a base station subsystem (for example, a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a portion or the entire coverage area of ​​at least one of a base station and a base station subsystem providing communications services within that coverage area.

[0512] In the present disclosure, a case where a base station sends information to a terminal and a case where the base station instructs the terminal to control / operate based on the information may be mutually replaced.

[0513] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (UE)”, and “terminal” can be used interchangeably.

[0514] 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, hand set, user agent, mobile client, client, or several other appropriate terms.

[0515] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a moving object, a moving object body, etc.

[0516] The mobile body refers to a movable object, and the moving speed is arbitrary, including the case where the mobile body is stopped. The mobile body includes, for example, vehicles, transport vehicles, cars, automatic two-wheeled vehicles (motorcycles), bicycles, connected cars, loading shovels, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, trolleys, rickshaws, ships (ships and other watercraft), airplanes, rockets, artificial satellites, drones, multi-rotor aircraft, quadcopters, balloons, and objects carried by them, but is not limited to these. In addition, the mobile body can also be a mobile body that moves autonomously based on operation instructions.

[0517] The mobile object may be a vehicle (e.g., a car, an aircraft, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station may include a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0518] Figure 18This figure shows an example of a vehicle according to one embodiment. Vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0519] The drive unit 41 is composed of, for example, at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is configured to include at least a steering wheel (also referred to as a handlebar), and steers at least one of the front wheels 46 and the rear wheels 47 based on user manipulation of the steering wheel.

[0520] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 included in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an ECU (Electronic Control Unit).

[0521] The signals from the various sensors 50-58 include a current signal from the current sensor 50 for sensing the current of the motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by the speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by the air pressure sensor 52, a vehicle speed signal obtained by the vehicle speed sensor 53, an acceleration signal obtained by the acceleration sensor 54, a stepping amount signal of the accelerator pedal 43 obtained by the accelerator pedal sensor 55, a stepping amount signal of the brake pedal 44 obtained by the brake pedal sensor 56, an operation signal of the shift lever 45 obtained by the shift lever sensor 57, a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 58, and the like.

[0522] Information service unit 59 is comprised of various devices, such as a vehicle navigation system, audio system, speakers, display, television, and radio, for providing (outputting) various information, including driving information, traffic information, and entertainment information, as well as one or more ECUs that control these devices. Information service unit 59 uses information obtained from external devices via communication module 60 and the like to provide various information and services (e.g., multimedia information and multimedia services) to the occupants of vehicle 40.

[0523] The information service unit 59 may include an input device for accepting input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.), or an output device for outputting to the outside (e.g., a display, a speaker, an LED light, a touch panel, etc.).

[0524] The driving assistance system unit 64 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving load, such as millimeter-wave radar, light detection and ranging (LiDAR), cameras, positioning sensors (such as the Global Navigation Satellite System (GNSS)), map information (such as high-definition (HD) maps, autonomous vehicle (AV) maps), gyroscope systems (such as inertial measurement units (IMUs)), inertial navigation systems (INS), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 to implement driving assistance functions or autonomous driving functions.

[0525] 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 between the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, the microprocessor 61 in the electronic control unit 49, the memory (ROM, RAM) 62, and various sensors 50-58 included in the vehicle 40.

[0526] The communication module 60 is controlled by the microprocessor 61 of the electronic control unit 49 and is a communication device capable of communicating with external devices. For example, various information can be transmitted and received between external devices via wireless communication. The communication module 60 can be located either inside or outside the electronic control unit 49. Examples of external devices include the aforementioned base station 10 and user terminal 20. Furthermore, the communication module 60 can also be, for example, at least one of the aforementioned base station 10 and user terminal 20 (or can function as at least one of the base station 10 and user terminal 20).

[0527] The communication module 60 may also transmit at least one of the following to an external device via wireless communication: signals input to the electronic control unit 49 from the various sensors 50-58 described above, information obtained based on these signals, and information based on external (user) input received via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, and the like may also be referred to as input units that receive input. For example, the PUSCH transmitted via the communication module 60 may also include information based on these inputs.

[0528] The communication module 60 receives various information (such as traffic information, traffic light information, and inter-vehicle information) transmitted from external devices and displays it to the vehicle's information service unit 59. The information service unit 59 may also be referred to as an output unit that outputs information (for example, outputs information to a display, speaker, or other device based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0529] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. The microprocessor 61 can also 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 included in the vehicle 40 based on the information stored in the memory 62.

[0530] Furthermore, the base station in this disclosure can also be rewritten as a user terminal. For example, the various methods / implementations of this disclosure can also be applied to a structure in which communication between a base station and a user terminal is replaced by communication between multiple user terminals (e.g., device-to-device (D2D) or vehicle-to-everything (V2X)). In this case, the user terminal 20 can also have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" can also be rewritten with terms corresponding to inter-terminal communication (e.g., "sidelink"). For example, uplink channels, downlink channels, etc. can also be rewritten as sidelink channels.

[0531] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0532] In this disclosure, operations are described as being performed by a base station, and sometimes by its upper node, depending on circumstances. Obviously, in a network including one or more network nodes including 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 (for example, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0533] The various methods / implementations described in this disclosure may be used individually or in combination, and may be switched between them during execution. Furthermore, the processing procedures, timings, flow charts, and the like of the various methods / implementations described in this disclosure may be reversed as long as they do not conflict. For example, the methods described in this disclosure use an illustrative order to present elements of various steps, but are not limited to the specific order presented.

[0534] The various modes and embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems utilizing other appropriate wireless communication methods, and next-generation systems based on enhancements, modifications, developments, or regulations of these systems. Furthermore, multiple systems may be combined for application (for example, LTE or LTE-A combined with 5G).

[0535] The phrase “based on” used in this disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on.”

[0536] Any reference to an element using the designations "first," "second," etc., as used in this disclosure, does not necessarily define the quantity or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to a first and a second element does not imply that only two elements may be used or that the first element must in some way take precedence over the second element.

[0537] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may also encompass situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching a table, database, or other data structure), ascertaining, and the like are considered "determining."

[0538] In addition, “judgment (decision)” may also refer to situations where receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc. are regarded as “judgment (decision)”.

[0539] Furthermore, "judgment (decision)" can also refer to situations where resolving, selecting, choosing, establishing, comparing, and the like are considered "judgment (decision)." In other words, "judgment (decision)" can also refer to situations where certain actions are considered "judgment (decision)." In this disclosure, "judgment (decision)" can be interchanged with the aforementioned actions.

[0540] In this disclosure, "determine / determining" can be interchanged with "assume / assuming," "expect / expecting," "consider / considering," and the like. Furthermore, in this disclosure, "do not assume..." can be interchanged with "do not assume...".

[0541] In the present disclosure, "expect" and "be expected" can be interchanged. For example, "expect(s)..." ("..." can also be expressed, for example, using a that clause, a to-infinitive, etc.) can be interchanged with "be expected...". "Does not expect..." can also be interchanged with "Does not expect...". In addition, "An apparatus A is not expected..." can also be interchanged with "An apparatus B other than apparatus A does not expect apparatus A..." (for example, when apparatus A is a UE, apparatus B can also be a base station).

[0542] The “maximum transmit power” described in the present disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0543] As used in this disclosure, the terms "connected," "coupled," and all variations 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 the two elements being "connected" or "coupled." The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" can also be rephrased as "accessed."

[0544] In the present disclosure, when two elements are connected, it is possible to consider them to be "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-inclusive examples, they are "connected" or "combined" to each other using electromagnetic energy having a wavelength in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc.

[0545] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other." Alternatively, the term may also mean "A and B are each different from C." Terms such as "separate" and "bound" may also be interpreted in the same manner as "different."

[0546] When used in this disclosure, "include," "including," and variations thereof have the same inclusive meaning as the term "comprising." Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0547] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include a case where the noun following the article is in a plural form.

[0548] In the present disclosure, “below,” “less than,” “above,” “more than,” “equal to,” and the like may be replaced with each other. Furthermore, in the present disclosure, sentences meaning “good,” “bad,” “big,” “small,” “high,” “low,” “early,” “late,” “wide,” “narrow,” and the like may be replaced with each other without being limited to the positive, comparative, and superlative forms. Furthermore, in the present disclosure, sentences meaning “good,” “bad,” “big,” “small,” “high,” “low,” “early,” “late,” “wide,” “narrow,” and the like may be replaced with each other as expressions appended with “ith” (i is an arbitrary integer) without being limited to the positive, comparative, and superlative forms (for example, “highest” may be replaced with “ith highest”).

[0549] In the present disclosure, “of,” “for,” “regarding,” “related to,” “associated with,” etc. may also be replaced with each other.

[0550] In this disclosure, expressions such as "when A, B," "if A, then B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at / on A," "B after A," "B since A," and "B until A" can be interchanged. Furthermore, A, B, and the like can be replaced with nouns, gerunds, or other appropriate expressions depending on the context. Furthermore, the time difference between A and B can be approximately zero (immediately after or immediately before). Furthermore, a time offset can be applied to the time when A occurs. For example, "A" can be interchanged with "before / after the time offset when A occurs." The time offset (eg, one or more symbols / time slots) may be predetermined or determined by the UE based on notified information.

[0551] In the present disclosure, timing, moment, time, time instance, arbitrary time unit (eg, time slot, sub-time slot, symbol, sub-frame), period, opportunity (occasion), resource, etc. may also be interchangeably written.

[0552] While the inventions disclosed herein have been described in detail above, it will be apparent to those skilled in the art that the inventions disclosed herein are not limited to the embodiments described herein. The disclosure herein is provided for illustrative purposes only and is not intended to limit the inventions disclosed herein.

Claims

1. A terminal comprising: a receiving unit, receiving indexes for channel state information CSI reporting of multiple transmission / reception points TRP used for coherent joint transmission CJT; and A control unit determines a plurality of values ​​based on the index, the plurality of values ​​being a plurality of values ​​of one of the following parameters and corresponding to the plurality of TRPs, respectively: a first parameter related to the number of beams, a second parameter for calculating the number of frequency-domain discrete Fourier transform (DFT) vectors, and a third parameter for calculating the number of selected CSI-reference signal ports, i.e., CSI-RS ports.

2. The terminal according to claim 1, wherein: The index corresponds to one of a plurality of candidates for a combination including the plurality of values ​​of the first parameter, one or more values ​​of the second parameter, and a value of a fourth parameter for calculation of a maximum number of non-zero coefficients.

3. The terminal according to claim 1, wherein: The index corresponds to one of a plurality of candidates including a combination of the plurality of values ​​of the third parameter, a value of a fourth parameter for calculation of a maximum number of non-zero coefficients, and a value of a fifth parameter representing the number of frequency-domain DFT vectors. The terminal according to claim 1 , wherein: The control unit determines at least one of the following based on a relationship between the plurality of values ​​and the one or more parameters: the plurality of values ​​and the one or more parameters.

5. A wireless communication method for a terminal, comprising: The step of receiving indices for channel state information CSI reporting of multiple transmission / reception points TRP for coherent joint transmission CJT; and A step of determining multiple values ​​based on the index, wherein the multiple values ​​are multiple values ​​of one of the following parameters and are multiple values ​​corresponding to the multiple TRPs respectively: a first parameter related to the number of beams, a second parameter for calculating the number of frequency-domain discrete Fourier transform DFT vectors, and a third parameter for calculating the number of selected CSI-reference signal ports, i.e., CSI-RS ports.

6. A base station comprising: a control unit configured to determine, for channel state information (CSI) reporting of a plurality of transmission / reception points (TRPs) for coherent joint transmission (CJT), a plurality of values, the plurality of values ​​being a plurality of values ​​of one of the following parameters, and corresponding to the plurality of TRPs, respectively: a first parameter related to the number of beams, a second parameter for calculating the number of frequency-domain discrete Fourier transform (DFT) vectors, and a third parameter for calculating the number of selected CSI-reference signal ports (CSI-RS ports); and The sending unit sends indexes corresponding to the multiple values.

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