Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit that receives Doppler CSI settings; and a control unit that determines, on the basis of the setting, whether to report a bitmap indicating the position of a non-zero coefficient for the Doppler CSI. 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 Rel. 10-14) has been standardized to further enhance the capacity and sophistication of Third Generation Partnership Project (3GPP) Releases 8 and 9.

[0003] Successor systems to LTE (also known as, for example, 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) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

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

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., NR), research is underway to report channel state information (CSI) based on received reference signals. Furthermore, research is underway to use multiple transmission / reception points (TRPs, Multi TRP (MTRP)) or multiple panels (multi-panel) for downlink transmission to user terminals (User Equipment (UE)). Furthermore, research is underway to use coherent joint transmission (CJT) using multiple TRPs / multi-panels. Furthermore, research is underway to improve communication performance for mobile / medium-speed terminals.

[0009] However, such CSI / codebooks 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 aspect of the present disclosure includes: a receiving unit that receives a Doppler CSI configuration; and a control unit that determines, based on the configuration, whether to report a bitmap indicating positions of non-zero coefficients used for the Doppler CSI.

[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 This shows an example of a 16-level quantization table.

[0016] Figure 2 This shows an example of an 8-level quantization table.

[0017] Figure 3A and 3B An example of an extended type 2 port selection codebook is shown.

[0018] Figure 4A and 4B An example of an extended type 2 port selection codebook is shown.

[0019] Figure 5 An example of a parameter combination for Rel.16 type 2 codebook is shown.

[0020] Figure 6 An example of a parameter combination for the Rel.17 type 2 port selection codebook is shown.

[0021] Figure 7 This shows an example of the mapping order of the CSI fields in the CSI part 1 of a CSI report.

[0022] Figure 8 This section shows an example of the mapping order of CSI fields in the CSI part 1 of a CSI report with CSI reporting mode (csi-ReportMode) = Mode2.

[0023] Figure 9 An example of a bitmap for indicating the positions of NZCs in Doppler CSI is shown.

[0024] Figure 10 An example of the operation involved in implementation #1 is shown.

[0025] Figure 11 An example of the operation involved in implementation #2 is shown.

[0026] Figure 12 This is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.

[0027] Figure 13 This is a diagram showing an example of the configuration of a base station according to one embodiment.

[0028] Figure 14 This is a diagram showing an example of the configuration of a user terminal according to one embodiment.

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

[0030] Figure 16 This is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0031] (CSI report or reporting)

[0032] 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)).

[0033] The RS used in the generation of CSI may be, for example, at least one of the Channel State Information Reference Signal (CSI-RS), the Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, the Synchronization Signal (SS), and the DeModulation Reference Signal (DMRS).

[0034] The CSI-RS may also include at least one of a non-zero power (NZP) CSI-RS and a CSI-Interference Management (CSI-IM) signal. An SS / PBCH block, also known as an SS block (SSB), includes both the SS and PBCH (and the corresponding DMRS). Furthermore, the SS may also include at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

[0035] 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 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.

[0036] 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. In this disclosure, the RRC IE may also be rewritten as RRC parameters, higher-layer parameters, and so on.

[0037] The report configuration information (eg, “CSI-ReportConfig” of RRC IE) may include at least one of the following.

[0038] Information related to the type of CSI report (report type information, e.g., "reportConfigType" of RRC IE)

[0039] Information on one or more quantities of CSI to be reported (one or more CSI parameters) (report quantity information, such as the "reportQuantity" RRC IE)

[0040] Information on RS resources used to generate the quantity (the CSI parameter) (resource information, for example, "CSI-ResourceConfigId" in RRC IE)

[0041] Information on the frequency domain that is the subject of the CSI report (frequency domain information, for example, "reportFreqConfiguration" in the RRC IE)

[0042] For example, the reporting type information may also indicate periodic CSI (P-CSI) reporting, aperiodic CSI (A-CSI) reporting, or semi-persistent CSI (SP-CSI) reporting.

[0043] 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.).

[0044] 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 an SSB or CSI-IM resource (eg, a zero-power CSI-RS resource).

[0045] 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 (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 a bandwidth part (BWP) within a certain carrier. Broadband can also be renamed as CSI reporting band, entire CSI reporting band, etc.

[0046] A subband is a portion of a wideband and can be composed of one or more resource blocks (RBs) or physical resource blocks (PRBs). The size of a subband is also determined by the size of the bandwidth (the number of PRBs).

[0047] Frequency domain information may also indicate whether wideband or subband PMI is reported. (Frequency domain information may also include, for example, 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.

[0048] 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 reporting band (e.g., a subband indication for each subband).

[0049] The UE uses the received RS to perform channel estimation and estimates the channel matrix H. The UE feeds back a parameter index (PMI) determined based on the estimated channel matrix.

[0050] The PMI may also indicate the precoder matrix (also referred to as 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).

[0051] 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) for single-beam selection and a second type (Type 2 CSI) for multi-beam selection. Single-beam may be rewritten as a single layer, and multi-beam may be rewritten as multiple beams. Furthermore, Type 1 CSI may not assume multi-user multiple-input multiple-output (MIMO), while Type 2 CSI may assume multi-user MIMO.

[0052] The codebooks described above may include a codebook for Type 1 CSI (also referred to as a Type 1 codebook, etc.) and a codebook for Type 2 CSI (also referred to as a Type 2 codebook, etc.). Furthermore, Type 1 CSI may include Type 1 single-panel CSI and Type 1 multi-panel CSI, and different codebooks (Type 1 single-panel codebook and Type 1 multi-panel codebook) may be specified for each.

[0053] 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.

[0054] 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 transmitted on either the PUCCH or the PUSCH.

[0055] In Rel.15 NR, UCI can include a CSI part for wideband PMI feedback. CSI report #n contains PMI wideband information when reported.

[0056] 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 can also be coded separately.

[0057] In Rel.15 NR, the UE is configured with N (N ≥ 1) CSI reporting configurations and M (M ≥ 1) CSI resource configurations via higher layers. For example, the CSI reporting configuration (CSI-ReportConfig) includes a channel measurement resource configuration (resourcesForChannelMeasurement), an interference CSI-IM resource configuration (csi-IM-ResourceForInterference), an interference NZP-CSI-RS configuration (nzp-CSI-RS-ResourceForInterference), and a report quantity (reportQuantity). Each of the channel measurement resource configuration, interference CSI-IM resource configuration, and interference NZP-CSI-RS configuration is 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).

[0058] In order to enable more dynamic channel / interference hypotheses for NCJT in both FR1 and FR2, the evaluation and definition of CSI reports for at least one transmission of multiple TRPs and multiple panels in DL are being studied.

[0059] (Codebook setting)

[0060] 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.

[0061] 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).

[0062] Codebook parameters include parameters related to codebook subset restriction (CBSR). CBSR settings indicate which PMI reports are permitted ("1") and which are not permitted ("0") for the precoder associated with the CBSR bit. Each bit in the CBSR bitmap corresponds to one codebook index / antenna port.

[0063] (CSI report settings)

[0064] 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), nzp-CSI-RS-ResourcesForInterference (NZP-IMR)), and other parameters. CSI-ReportConfig parameters other than codebookConfig-r16 are also included in the Rel.15 CSI reporting configuration.

[0065] In Rel. 17, an extended CSI reporting configuration (CSI-ReportConfig) for CSI measurement / reporting in multiple TRPs using NCJT is under investigation. In this CSI reporting configuration, two CMR groups corresponding to each of the two TRPs are configured. CMRs within a CMR group can also be used for measurements in 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 in a CMR pair for single TRP measurements.

[0066] Regarding CSI reporting 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.

[0067] <Option 1>

[0068] The UE is configured to report X (X = 0, 1, 2) CSIs associated with the single TRP measurement assumption 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.

[0069] <Option 2>

[0070] The UE may also be configured to report 1 CSI associated with the best measurement result among the measurement assumptions for NCJT and single TRP.

[0071] As described above, in Rel. 15 / 16, CBSR is configured for each codebook configuration in each CSI reporting configuration. That is, CBSR is applied to all CMRs, etc. in the corresponding CSI reporting configuration.

[0072] 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.

[0073] Option 1 (X=0): Only NCJT CSI measurement.

[0074] Option 1 (X=1): Measurement of the CSI of the NCJT and the CSI of a single TRP (1 TRP).

[0075] Option 1 (X=2): Measurement of the CSI of the NCJT and the CSI of a single TRP (2 TRPs).

[0076] Option 2: Measurement of both NCJT CSI and single TRP CSI.

[0077] (Type 1 codebook)

[0078] As the Type 1 codebook (Rel.15), for the base station plane, the Type 1 single-panel codebook and the Type 1 multi-panel codebook are specified. In the 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 the type 1 multi-panel, the number of CSI-RS antenna ports P is specified. CSI-RS , for (N g , N1, N2), specifies the antenna model of the CSI antenna port array (logical setting).

[0079] For Rel.15 type 1 single panel CSI, the higher layer parameter of the UE codebook type (subType in type1 in codebookType in CodebookConfig) is set to type 1 single panel ('typeI-SinglePanel'). In the case where the number of layers v∈{2, 3, 4} is not the same, the PMI value corresponds to the 3 codebook indices i 1，1 ,i 1，2, i2. In the case of layer number v∈{2, 3, 4}, the PMI value corresponds to 4 codebook indexes i 1，1 ,i 1，2 ,i 1，3 , i2. In the case where 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 can also be an index for a wideband. i2=n can also be an index for a subband / phase.

[0080] For P CSI-RS The supported (N1, N2) and (O1, O2) settings (value combinations) are specified in the specification. (N1, N2) represents the number of two-dimensional (2D) antenna elements and is set by the higher-level parameters n1-n2 in the moreThanTwo field within nrOfAntennaPorts within typeI-SinglePanel. n1-n2 are bitmap parameters with N1O1N2O2 bits. (O1, O2) represents the 2D oversampling factor.

[0081] In a 1-layer CSI report and a codebook with 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, for using antenna ports 3000 to 2999+P CSI-RS The matrix of the 1-layer CSI report codebook is W_i 1，1 ,i 1，2 , i2^(1). Here, W l，m，n （1） It is given by the following formula.

[0082]

[0083] Here, v l，m The 2D-SD-DFT basis vectors are (exp(j2πln1 / O1N1)×exp(j2πmn2 / O2N2), n1=0, 1, ..., N1-1, n2=0, 1, ..., N2-1) with N1 rows and N2 columns. Phase integration (co-phasing) between polarizations (horizontally and vertically) is performed. n=exp(jπn / 2), which represents the phase of one polarized wave relative to the phase of another polarized wave.

[0084] For Rel.15 type 1 multi-panel CSI, compared with type 1 single panel, in addition to N1 and N2, the number of panels N is also set. g As inter-panel co-phasing (phase compensation between panels), add and report i, 1，4 For each panel, the same SD beam is selected (precoding matrix W l ), only the inter-panel phase integration is appended and reported.

[0085] For P CSI-RS , supported (N g The settings (combinations of values) for (N1, N2) and (O1, O2) are specified in the specification. (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, it is used to use antenna ports 3000 to 2999+P CSI-RS The matrix of the 1-layer CSI reporting 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.

[0086] For N g = {2, 4}W_l, m, p, n^1, N 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 , and for the second layer, N g =2, codeBookMode=1 matrix W l，m，p，n 2，2，1 , and 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 given by the following formula.

[0087]

[0088] 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 integration between panels. For panels 0, 1, 2, 3, the same beam is selected (SD beam matrix, precoding matrix W l ), φ_p1 represents the phase compensation of panel 1 of panel 0, φ_p2 represents the phase compensation of panel 2 of panel 0, and φ_p3 represents the phase compensation of panel 3 of panel 0.

[0089] (Type 2 codebook)

[0090] In this disclosure, a matrix Z having X rows and Y columns is sometimes expressed as Z(X×Y).

[0091] For Rel.15 type 2 CSI, for a given layer l, the generation of a per-subband (SB-wise) precoding vector is based on the following equation.

[0092] W l (N t × N3) = W1W 2， (X3)

[0093] N t is the number of antennas / antenna ports. N3 is the total number (number of subbands) of precoding (beamforming) matrices (precoders) indicated by PMI. W1(N t ×2L) is a matrix (SD beam matrix) formed by L∈{2,4} (oversampled) spatial domain (SD) 2D DFT vectors (SD beams, 2D-DFT vectors). L is the number of beams. The actual number of beams, considering both horizontal and vertical deflections at one location, is 2L. For example, L=2 SD 2D-DFT vectors are b i , b j .W 2，l(2L×N3) is the matrix (LC coefficient matrix) formed by the linear combination coefficients (linear combination (LC) coefficients, subband complex LC coefficients, and combination coefficients) for layer l. 2，l Indicates beam selection and co-phasing between two polarizations. For example, two W 2，l c i , c j For example, the channel vector h is obtained by linear combination of L=2 SD 2D-DFT vectors c i b i , +c j b j The feedback overhead is mainly due to the LC coefficient matrix W 2，l In addition, the type 2 CSI of Rel.15 only supports ranks 1 and 2.

[0094] In Type 2 CSI, the channel (channel matrix) for a particular user is represented by a linear combination of two polarizations and L beams (L 2D-DFT vectors). Rel.15 Type 2 CSI supports ranks 1 and 2.

[0095] (Extension of Type 2 codebook (Rel.16))

[0096] Rel.16 Type 2 CSI (enhanced Type 2 codebook) reduces the W 2，l The associated overhead. In addition to ranks 1 and 2, the Type 2 CSI of Rel.16 also supports ranks 3 and 4.

[0097] In Rel.16 type 2 CSI, for the given layer 1, the UE reports information based on the following formula.

[0098] W l = W1W ~ l W f，l H (X4)

[0099] W 2，l By W ~ l W f，l H The matrix W is approximated. ~ It can also be represented by adding a ~ (tilde) to the W. ~ l It can also be expressed as W ~ 2，l Matrix Wf，l H It's W f，l The adjoint matrix of f，l It is obtained by taking the conjugate transpose of .

[0100] For CSI reporting, the UE can also be configured with one of the two subband sizes. This subband (CQI subband) can also be defined as N PRB SB The number of consecutive PRBs depends on the total number of PRBs in the BWP. The number of PMI subbands, R, for each CQI subband is set using the RRCIE (numberOfPMI-SubbandsPerCQI-Subband). R controls the total number of precoding matrices, N3, represented by the PMI as a function of the number of subbands set in the CSI-ReportingBand, the subband size set using subbandSize, and the total number of PRBs in the BWP.

[0101] W1 (N t ×2L) is a matrix formed by multiple (oversampled) spatial domain (SD) 2D-DFT vectors (beams). This matrix reports multiple indices of the two-dimensional discrete Fourier transform (2D-DFT) vectors and the two-dimensional oversampling factor. The spatial domain response / distribution represented by the SD 2D-DFT vectors is also called an SD beam.

[0102] W ~ l (2L×M v ) is a matrix of LC coefficients. For this matrix, a maximum of K0 non-zero coefficients (non-zero coefficients (NZCs), LC coefficients with non-zero amplitudes) are reported. This report consists of two parts: a bitmap that identifies the NZC positions and a quantized NZC.

[0103] W f，l (N3×M v ) is a matrix formed by multiple frequency domain (FD) bases (vectors) for layer 1. 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. Each layer has M van FD basis (FD DFT basis). When N3 > 19, select M from the intermediate subset (InS) of size N3' (< N3). v an FD basis. When N3 ≤ 19, report log2(C(N3 - 1, M v - 1)) bits. Here, C(N3 - 1, M v - 1) represents the number of combinations (combinatorial coefficient C(x, y)) of selecting M v - 1 from N3 - 1, and is also called binomial coefficients.

[0104] The response / distribution (frequency response) in the frequency domain represented by the linear combination of FD basis vectors and LC can also be called an FD beam. The FD beam can also correspond to a delay curve (time response).

[0105] The PMI sub - band size is given by CQI sub - band size / R, where R ∈ {1, 2}. The number of FD bases M v for the given rank v is given by ceil(p v × N3 / R). The number of FD bases is the same for all layers l ∈ {1, 2, 3, 4}. p v is set by the higher layer.

[0106] For the FD bases (DFT) of indices t = 0, 1,..., N3 - 1 associated with the precoding matrix (sub - band) and layers l = 1,..., v, it is y t，l （f） = exp(j2πtn 3，l （f） / N3). Among the M v FD basis vectors, for the FD basis vectors associated with indices f = 0, 1,..., M v - 1, the FD basis vector is [y 0，l ] （f） , y 1，l （f） ,..., y N_3-1，l （f） T . M v FD basis vectors are determined by M initial ∈{-2M v + 1, -2M v + 2,..., 0}, n<000013!>= [n 3，l （0） ,..., n 3，l （M_v-1） , n 3，l ​（f） ∈{0, 1, ..., N3-1} and identified.

[0107] 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 defined (in the time domain, the power delay profile becomes discrete). As a result, the channel frequency response of each SD beam has a high correlation (approximately flat in the frequency domain). In this case, the channel frequency response can be approximated by a linear combination of a small number of FD bases. For example, in M v = 2, using the FD basis f2, f q and LC coefficient d1 0 , d2 0 , the frequency response associated with SD beam b0 is through d1 0 f2+,d2 0 f q is approximated.

[0108] Select the main (dominant) M v By setting M v ≪N3, W ~ l The cost is less than W 2，l The cost is quite small. v All or part of the FD basis is used to approximate the frequency response of each SD beam. The bitmap is used to report only the FD basis selected for each SD beam. If the bitmap is not reported, all FD basis are selected for each SD beam. In this case, the NZC of all FD basis is reported for each SD beam. The number of NZCs in one layer K 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 upper layer.

[0109] In the Rel.16 (enhanced) type 2 codebook, L, β, p v The value of (parameter combination) is determined by the higher-layer parameter paramCombination-r16 (codebook parameter setting).

[0110] Rel. 16 PUSCH Type 2 CSI feedback consists of two parts. CSI Part 1 has a fixed payload size and is used to identify the number of information bits in CSI Part 2. Part 2 is variable in size (the UCI size depends on the number of NZCs, which is unknown to the base station). The UE is reported 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.

[0111] In enhanced Type 2 CSI feedback, CSI Part 1 (if reported) contains the RI, CQI, and an indicator of the total number of non-zero amplitude coefficients across multiple layers for the extended Type 2 CSI. The fields of Part 1 (if reported), namely the RI, CQI, and the indicator of the total number of non-zero amplitude coefficients across multiple layers, are coded separately. CSI Part 2 contains the PMI for the extended Type 2 CSI. Parts 1 and 2 are coded separately. CSI Part 2 (PMI) contains the oversampling factor, the index of the 2D-DFT basis, and the index M of the initial DFT basis (starting offset) of the selected DFT window. initial , a DFT basis selected per layer, an NZC (amplitude and phase) per layer, a strongest coefficient indicator (SCI) per layer, and at least one of the amplitude of the strongest coefficient per layer / per polarization.

[0112] Multiple PMI indices (PMI values, codebook indices) associated with different CSI part 2 information may also follow the following for the lth layer.

[0113] ·i 1，1 : Two-dimensional oversampling factor [q1 q2]. q1∈{0, 1, ..., O1-1}, q2∈{0, 1, ..., O2-1}.

[0114] ·i 1，2 : Multiple indices of the (SD) 2D-DFT basis (beam). i 1，2 ∈{0, 1,...,C(N1N2,L)-1}.

[0115] ·i 1，5 : Codebook indicator. Index of the (FD)DFT basis of the selected DFT window. i 1，5 ∈{0, 1, ..., 2M v -1}.

[0116] ·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}.

[0117] ·i 1，7，l : Bitmap indicator for layer l. Non-zero bits in this bitmap identify report i 2，4，l and i 2，5，l Which coefficient is 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}.

[0118] ·i 1，8，l : For the strongest coefficient indicator of the lth layer (the largest element k in the amplitude coefficient indicator l，i，f （2） ).

[0119] ·i 2，3，l : Amplitude coefficient indicator of the coefficient (broadband) of the lth layer (of two partial waves). i 2，3，l =[k l，0 （1） k l，1 （1） ].

[0120] ·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） ].

[0121] ·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 ].

[0122] f l * ∈{0, 1, ..., M vLet - 1} be set as i 2，4，l as the index, and let i l * ∈ {0, 1,..., 2L - 1} be set as k l，f_l^* （2） as the index. The f l * and i l * identify the strongest coefficient for layers l = 1,..., v, that is, for layer l, the element k of i 2，4，l l，i_l^*，f_l^* （2） . The codebook index n 3，l with respect to n 3，l （f_l^*） is remapped to n 3，l （f） = (n 3，l （f） - n 3，l （f _l^*） ) mod N3, and after remapping, it becomes n 3，l （f_l^*） = 0. The index f with respect to f l * is remapped to f = (f - f l * ) mod M v , and after remapping, it becomes f l * = 0 (l = 1,..., v). i 2，4，l 、i 2，5，l 、and i 1，7，l respectively represent the amplitude coefficient, phase coefficient, and bitmap after remapping. The strongest coefficient of layer l identified by i 1，8，l ∈ {0, 1,..., 2L - 1}, for v = 1, is given as i 1，8，l = Σ i=0 i_1^* k l，i，0 <o000248>- 1, and for 1 < v ≤ 4, it is given as i 1，8，l = i l * .

[0123] W ~ l Each reported LC coefficient (complex coefficient) within is the amplitude and phase that are respectively quantized.

[0124] [Amplitude Quantization]

[0125] The polarization - specific reference amplitude is used Figure 1 from the table (amplitude coefficient indicator i 2，3，l It should be noted that there seems to be a typo in the original text where "<o000248>" appears. It is likely supposed to be " （3） ". This translation has been done based on the best understanding of the provided text with the given rules.Mapping of elements: From the amplitude coefficient indicator element k l，p （1） Mapped to the amplitude coefficient p l，p （1） ) is quantized to 16 levels. 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 calculated using Figure 2 Table (Amplitude coefficient indicator i 2，4，l Mapping of elements: From the amplitude coefficient indicator element k l，i，f （2） Mapped to the amplitude coefficient p l，i，f （2） ) is quantized to 8 levels. l （2） =[p l，0 （2） ... p l，M_v-1 （2） ]、p l，f （2） =[p l，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}.

[0126] [Phase Quantization]

[0127] 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. For phase integration, the amount 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 ]、cl，i，fi ∈{0,...,15}.

[0128] Amplitude coefficient indicator element k corresponding to the strongest coefficient of layer l l，floor（i_l^* / L） （1） =15 (maximum), the amplitude factor indicator element k l，i_l^*，0 （2） =7 (maximum), phase coefficient indicator element c l，i_l^*，0 （2） = 0 (minimum). For l = 1, ..., v, k is not reported. l，floor（i_l^* / L） （1） 、k l，i_l^*，0 （2） 、c l，i_l^*，0 （2） =0.

[0129] i 1，5 and i 1，6，l Is the PMI index used for (FD)DFT basis reporting. Only when N3>19, report i 1，5 .

[0130] By using 3000 to 2999+P CSI-RS The matrix W represents the codebook of the v (=1 to 4) layer CSI report （v） Based on the following matrix W for layer l (=1 to v) l .

[0131]

[0132] 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(beam)-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 contains the strongest coefficient for each bias, the amplitude coefficient for each bias, each FD-DFT basis, and each SD-DFT basis, and the phase coefficient for each bias, each FD-DFT basis, and each SD-DFT basis.

[0133] As a grouping of CSI Part 2, for a given CSI report, the PMI information is integrated 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.

[0134] Group 0: index i 1，1 、i 1，2 、i 1，8，l (l=1,...,v)

[0135] 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)

[0136] ·Group 2: i 1，7，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)

[0137] In Type 1 CSI, an SD beam represented by an SD DFT vector is transmitted to the UE. In Type 2 CSI, L SD beams are linearly combined and transmitted to the UE. Each SD beam can be associated with multiple FD beams. For each SD beam, the channel frequency response is obtained by linearly combining these FD basis vectors. The channel frequency response corresponds to the power delay profile.

[0138] (Type 2 port selection codebook / extension (Rel.16) / additional extension (Rel.17))

[0139] In Rel.15 Type 2 Port Selection (PS) CSI (Type 2 PS codebook), the UE does not need to consider the 2D-DFT to derive the SD beam, as is required for Type 2 CSI. The base station transmits CSI-RS using K CSI-RS ports beamformed with consideration of the SD beam set. The UE selects / identifies the best L (≤ K) CSI-RS ports per offset and reports these indices within W1. Rel.15 Type 2 PS CSI supports ranks 1 and 2.

[0140] 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.

[0141] For layer l∈{1, 2, 3, 4}, the subband (SB)-wise precoder generation is given by the following equation.

[0142] W l (N t × N3) = QW1W ~ l W f，l H (Y2)

[0143] Here, Q(N t ×K) represents the K SD beams used in CSI-RS beamforming. W1 (K×2L) is a block diagonal matrix. ~ l (2L×M) is the LC coefficient matrix. W f，l (N3×M) consists of N3 FD-DFT basis vectors (FD basis vectors). K is set by the upper layer. L is set by the upper layer. P CSI-RS ∈{4, 8, 12, 16, 24, 32}. In P CSI-RS When >4, L∈{2, 3, 4}.

[0144] In Rel.15 / 16 type 2PS CSI, each CSI-RS port #i is associated with the SD beam (b i ) association ( Figure 3A and 3B ).

[0145] Rel.16 Type 2 PS CSI reduces the number of FD bases from N3 to M in the same way as Rel.16 Type 2 CSI v =(M v≪N3), which can reduce overhead compared to Rel.15 type 2PS CSI.

[0146] In the CSI / codebook of type 2 port selection (additional extension, further extended (furtherened) type 2 port selection codebook) of Rel. 17, each CSI-RS port #i is used as an alternative to the SD beam and is used with the SD-FD beam pair (SD beam b i and FD beam f i，j (j is the frequency index)) association ( Figure 4A and 4B ). In this example, ports 3 and 4 are associated to the same SD beam and are associated to different FD beams.

[0147] The frequency selectivity of the channel frequency response observed by the UE based on the SD beam-FD beam pair can also be reduced by delay pre-compensation compared to the frequency selectivity of the channel frequency response observed by the UE based on the SD beam.

[0148] The primary scenario for the Type 2 port selection codebook in Rel. 17 is FDD. Channel reciprocity based on SRS measurements is incomplete (the UL beam and DL beam angles may differ. In FDD, the UL frequency differs from the DL frequency, and the effective antenna spacing differs between the UL and DL frequencies). However, the base station is able to obtain / select certain pieces of information (the primary (dominant) angles and delays (SD beam and FD beam)). In addition to CSI reports, the base station uses SRS measurements to obtain CSI for determining the DL MIMO precoder. In this case, some CSI reports can be omitted to reduce CSI overhead.

[0149] In the Rel.17 (further enhanced) type 2 port selection codebook, the values ​​of α, M, and β (parameter combination) are determined by the higher-layer parameter paramCombination-r17 (codebook parameter setting). Figure 5 An example of a parameter combination for Rel.16 type 2 codebook is shown. Figure 6 This shows an example of parameter combinations for the Rel.17 type 2 port selection codebook. The precoding matrix indicated by the PMI is determined from L+M vectors. Here, L=K1 / 2, K1=αP CSI-RS .

[0150] In Rel. 17 Type 2 PS CSI, each CSI-RS port is beamformed using an SD beam and an FD basis vector, and each port is associated with an SD-FD pair.

[0151] For the given layer 1, the UE reports information based on the following formula.

[0152] W l (K×N3) = W1W ~ l W f，l H (Y3)

[0153] 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 K and uses them as the PMI (W 1，l ) and reports it to the base station. In addition, in Rel.16, each port is associated with an SD beam.

[0154] W ~ l (2L×M v ) is a matrix consisting of combined coefficients (subband complex LC coefficients). A maximum of K0 NZCs are reported. The report consists of a bitmap that identifies the NZC positions and the quantized NZCs. The bitmap can be omitted in certain circumstances. In Rel. 16, the NZC position bitmap is always reported.

[0155] W f，l (N3×M v ) is a matrix formed by N3 FD basis (FD-DFT basis) vectors. There are M v FD basis. The base station can also eliminate W f，l In W f，l When it is turned on (ON), report M v An additional FD basis. f，l If it is OFF, the additional FD basis is not reported. In addition, in Rel.16, W is always reported. f，l .

[0156] In Rel.17 Type 2PS CSI, 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, i for l=1,...,v is not reported. 1，7，l (Bitmap indicator for the lth layer) That is, when the total number of reported NZCs is equal to the maximum number of K1Mv and v≤2, reporting of the bitmap indicating the positions of NZCs is omitted.

[0157] (CSI feedback on PUSCH)

[0158] In Type 1, Type 2, Extended Type 2, and Additional Extended Type 2 port selection CSI feedback on the PUSCH, the CSI report consists of two parts. Part 1 has a fixed payload size and is used to identify the number of information bits in Part 2. Part 1 is transmitted in its entirety before Part 2.

[0159] In Extended Type 2 CSI feedback and Additional Extended Type 2 Port Select CSI feedback, Part 1 (if reported) contains the RI, CQI, and an indication of the total number of non-zero amplitude coefficients across multiple layers. The fields in Part 1 (if reported), namely the RI, CQI, and indication of the total number of non-zero amplitude coefficients across multiple layers, are coded separately. Part 2 contains the PMI of the Extended Type 2 or Additional Extended Type 2 Port Select CSI. Parts 1 and 2 are coded separately.

[0160] Figure 7 An example of the mapping order of CSI fields for CSI Part 1 of a CSI report is shown. The mapping order used for CSI Part 1 of this single TRP applies to both Type 1 and Type 2 CSI.

[0161] Figure 8 This section shows an example of the mapping order of CSI fields in CSI Part 1 of a CSI report with CSI reporting mode (csi-ReportMode) = Mode 2. This section specifies the mapping order used for CSI Part 1 of Rel. 17 NCJT CSI with different reporting modes.

[0162] Multiple subbands of the CSI part #n indicated by the higher-layer parameter csi-ReportingBand may be numbered consecutively in ascending order, including the lowest subband of the csi-ReportingBand which is subband 0.

[0163] (JT)

[0164] Joint transmission (JT) may also mean simultaneous data transmission from multiple points (eg, TRPs) to a single UE.

[0165] 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 completely non-overlapping. In the event of overlap, the PDSCH from one TRP interferes with the PDSCHs from other TRPs.

[0166] In Rel. 18, support for coherent joint transmission (CJT) using up to four TRPs is under study. Data from the four TRPs can be coherently precoded and sent to the UE on the same time-frequency resources. For example, channels from the four TRPs can be considered, using the same precoding matrix. Coherence can also mean that there is a certain relationship between the phases of the multiple received signals. Alternatively, using joint precoding with four TRPs can improve signal quality and eliminate interference between the four TRPs. Data can also be subject to interference only outside the four TRPs.

[0167] (Rel.17 NCJT CSI)

[0168] 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 single TRP. A single CSI reporting mode can be configured from two modes.

[0169] CSI-ReportConfig for Rel.17 non-coherent joint transmission (NCJT) CSI sets the CMR and CSI reporting mode (csi-ReportMode) through RRC signaling.

[0170] Accompanied by K s =K1+K2 CMRs are set to UE. 2≤Ks ≤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. By selecting from all possible pairs, N (N groups) of CMR pairs are set by the higher layer. Support N=1, K s =2. N max =2 support is an optional function of UE. S，max =X support is an optional feature of the UE. Each CMR can contain a maximum of 32 CSI-RS ports depending on the UE capabilities. Each CMR pair is associated with a CRI value.

[0171] The RRC signaling-based bitmap shows one CMR from each CMR group to indicate the N (N = 1, 2) CMR pairs actually used in the NCJT measurement. The UE uses CMRs from two CMR groups to measure single TRP CSI for TRP1 and single TRP CSI for TRP2, using N CMR pairs to measure NCJT CSI.

[0172] The UE selects one or more CSIs to report based on the mode configured by csi-ReportMode. csi-ReportMode indicates one of the following two modes: Mode 1 and Mode 2.

[0173] Support at least one of the following modes 1 and 2.

[0174] [Mode 1]

[0175] A 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 or 2 is an optional feature for UEs supporting Option 1.

[0176] [Mode 2]

[0177] The UE may also be configured to report a CSI associated with the best one of the measurement conditions of NCJT and single TRP.

[0178] In Mode 1, the UE reports a total of X+1 CSIs, including X (X=0, 1, 2) single-TRP CSIs and one NCJT CSI. In Mode 2, the UE reports the best CSI (one CSI) among all single-TRP CSIs and one NCJT CSI.

[0179] In a single CSI report, a maximum of 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 layers below 4). Single-TRP CSI is the same as existing CSI, including one CRI, one RI / PMI / LI, and one or two CQIs (for layers below 8, one CQI per CW).

[0180] For the following scenarios, a new mapping order (table) of multiple fields within a CSI report is defined.

[0181] Mapping order for wideband CSI with mode 1 associated with X=0. Wideband CSI is supported only for mode 1 associated with X=0, i.e., NCJT CSI.

[0182] • Mapping order of CSI part 1 for modes 1 and 2.

[0183] • Mapping order of CSI part 2 wideband for modes 1 and 2.

[0184] • Mapping order of CSI part 2 subbands for modes 1 and 2.

[0185] (CJT)

[0186] In Rel. 18, support for coherent joint transmission (CJT, mTRP CJT) using up to four TRPs is under study. Data from the four TRPs can be coherently precoded and sent to the UE on the same time-frequency resources. For example, considering channels from four TRPs, the same precoding matrix can be used. Coherence can also mean that there is a certain relationship between the phases of the multiple received signals. Alternatively, using four-TRP joint precoding can improve signal quality and eliminate interference between the four TRPs. Data can also be subject to interference only outside the four TRPs.

[0187] In an ideal scenario (where four TRPs are co-located (considered the same location)), the aggregated channel matrix H can be jointly estimated, and the joint precoding matrix V can be fed back. However, the large-scale path loss of the four paths can sometimes vary significantly. The joint precoding matrix V based on a constant module codebook is inaccurate. In this case, per-TRP feedback and the inter-TRP coefficients can be more integrated than the current NR Type 2 codebook.

[0188] For CJT with a maximum of 4 TRPs in FR1, the selection of the 4 TRPs can also be semi-static. Consequently, this selection and the setting of the 4 CMRs (4 CSI-RS resources) used for channel measurement can also be semi-static. Dynamic indication of the 4 TRPs from the list of CSI-RS resources is also possible, but less likely.

[0189] 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.

[0190] A fallback operation to NCJT (ie, single TRP) is considered, as is CSI per TRP (ie, single TRP CSI like NCJT CSI in Rel. 17).

[0191] (CJT CSI)

[0192] Research is underway to improve 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.

[0193] The following are being studied as CSI extensions for CJT.

[0194] • CMR and IMR for measurement of maximum 4 TRPs.

[0195] • Per-TRP CSI along with inter-TRP CSI feedback for x-TRP CJT.

[0196] Inter-TRP CSI: New feedback and codebook for the inter-TRP phase matrix, inter-TRP amplitude matrix, and inter-TRP matrix (including both amplitude and phase).

[0197] · Ability to add reporting of x-TRP CJT CQI.

[0198] As a multi-TRP CJT CSI, the following are being studied.

[0199] Restrictions on the settings of CMR / CSI for each TRP.

[0200] Inter-TRP CSI / PMI (e.g., inter-TRP phase with / without inter-TRP amplitude).

[0201] [Option 1] In addition to the Rel.16 / 17 Type 2 codebook, there is also an independent codebook and feedback.

[0202] [Option 2] With W l ~ W f，l H / In W l ~ W f，l H W2 of CSI / PMI transmitted between TRPs. Common / different FD substrates for multiple TRPs.

[0203] As a multi-panel type 2CSI for multi-TRP CJT, the following is being studied.

[0204] • Multi-panel extension of the Type 2 codebook and Type 2 PS codebook of Rel.16 / 17.

[0205] • New antenna settings for Type 2 multi-panel codebook.

[0206] W1 (SD base) / W for each TRP f (FD base) can be the same or different. l (NZC) can also be different. W1 / W for each TRP f / W l They can be selected jointly or independently. f / W l Design, preferably with different options for different scenarios. φ It can be reported as a stand-alone content or in W l The policies used depend on the deployment scenario (e.g., intra-site multiple TRPs or inter-site multiple TRPs).

[0207] For example, the precoding matrix for 4-TRP CJT CSI (codebook) can also be obtained by 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 independently. l They can be different, selected together, or selected independently. f They can be the same or different, and can be selected jointly or independently.

[0208] In the (Rel. 18) type 2 codebook (codebook structure) for CJT multi-TRP (mTRP), at least one of the following modes (codebook modes) may be supported.

[0209] [Mode 1]

[0210] 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 formula. Here, N is the number of TRPs or TRP groups.

[0211]

[0212] [Mode 2]

[0213] The SD basis selection for each TRP / each TRP group (port group or resource) and the joint / common FD basis selection (across N TRPs / TRP groups) are given by the following equation, for example. Here, N is the number of TRPs or TRP groups.

[0214]

[0215] 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.

[0216] In the improvement of type 2 codebook, the selection of N CSI-RS resources is studied to be performed by the UE and reported as part of the CSI report. TRP}. N is the number of coordinated CSI-RS resources (TRP). N TRP It is the maximum number of coordinated CSI-RS resources (TRP) and is set by the base station via higher layer signaling.

[0217] The 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. From N TRP The selection of N CSI-RS resources can also be done by the N CSI-RS resources in CSI part 1. TRP For example, when N=4 TRPs are set and the UE selects the first and third TRPs, the UE may also report the bitmap indicating the selection

[1010] . Alternatively, N=N TRP The limit setting can also be set by the base station via high-layer signaling. For example, when setting N=N TRP= 4 TRPs, the UE may also report the CJT CSI assuming 4-TRP CJT. In the case of setting this restriction, it is also possible not to report N TRP Alternatively, only one transmission hypothesis is reported, and the UE does not need to calculate the CSI for multiple transmission hypotheses.

[0218] 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, SD basis vector number, beam number 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 higher 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 , L i It can also correspond to TRP#i. L >1, from the set N L The multiple values ​​{L1, ..., L N_TRP} can also be reported in CSI Part 1 using an indicator. L =1 can also be N supported by UE L According to the existing design, the SD basis selection for the nth (n=1, ..., N) selected CSI-RS resource can also use the value from C(P CSI-RS / 2,L n ) code points are selected and shown in CSI part 2. Here, in the improvement based on Rel.16, it can also be P CSI-RS =2*N1N2. 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} for L in the improvement based on Rel.16. In the improvement based on Rel.17, the base station may also set the candidate values ​​{α1, ..., α N_TRP}、L n =α n P CSI-RS / 2, α n N = {1 / 2, 3 / 4, 1} LFollowing the existing design, among all the selected N CSI-RS resources, the SD basis oversampling group for each CSI-RS resource can also use an indicator selected from the set of O1O2 code points, as shown in CSI part 2.

[0219] In the configuration and selection of the SD base, for four TRPs, the base station can configure multiple combinations of full TRPs, such as {6, 4, 2, 2}, {4, 4, 4, 2}, {6, 6, 2, 4}, and {4, 2, 2, 4}. Furthermore, the UE can also use an indicator to select / configure a combination.

[0220] In the improvement of the type 2 codebook for CJT mTRP, studies are underway to support independent bitmaps for each CSI-RS resource regarding the positions of non-zero coefficients (NZCs) indicated by the bitmap for each layer. The size of the entire bitmap is Σ n=1 N B n Here, B n is the size of the bitmap for CSI-RS resource n.

[0221] Regarding the bitmap indicating the location of NZCs, the use of existing designs is under study. This implies that the size of the bitmap (B n ) = 2L n M v .

[0222] The restriction K0 on the maximum number of NZCs per layer is being studied to be commonly defined across all N CSI-RS resources (all N TRPs).

[0223] Support for a limit on the total number of NZCs across all layers is under investigation. Following the existing specification, the maximum value for this number is 2K0.

[0224] (Priority rules for CSI reports)

[0225] In the priority rules for CSI reports, CSI reports and priority values ​​Pri iCSI (y, k, c, s) = 2·N cells ·M s y+N cells ·M s k+M sc+s association. For A-CSI reports transmitted on PUSCH, y=0. For SP-CSI reports transmitted on PUSCH, y=1. For SP-CSI reports transmitted on PUCCH, y=2. For P-CSI reports transmitted on PUCCH, y=3. For CSI reports that transmit L1-RSRP or L1-SINR, k=0. For CSI reports that do not transmit L1-RSRP or L1-SINR, k=1. C is the serving cell index. N cells is the maximum number of serving cells configured (the value of the higher layer parameter maxNrofServingCells). S is the ID of the CSI report configuration (reportConfigID). M s is the maximum number of configured CSI report configurations (value of the higher-layer parameter maxNrofCSI-ReportConfigurations). If the priority value associated with the first CSI report is lower than the priority value associated with the second CSI report, this means that the first CSI report takes precedence over the second CSI report (the priority of the first CSI report is higher than the priority of the second CSI report).

[0226] (CSI Processing Criteria)

[0227] The UE uses the following capability information to report the number of simultaneous CSI calculations supported (maximum number of simultaneous CSI calculations) N CPU . N CPU Indicates the number of CSI processing units (CPUs).

[0228] SimultaneousCSI-ReportsPerCC within csi-ReportFramework within MIMO-ParametersPerBand. MIMO-ParametersPerBand is used to transmit MIMO-related parameters specific to a particular band. csi-ReportFramework indicates whether the UE supports the CSI reporting framework. SimultaneousCSI-ReportsPerCC indicates the number of CSI reports for which the UE can simultaneously measure and process reference signals within a CC in a band that supports this capability. CSI reports can include periodic, semi-persistent, and aperiodic CSI, arbitrary delay levels, and codebook types. CSI reports within simultaneousCSI-ReportsPerCC include both beam reports and CSI reports.

[0229] simultaneousCSI-ReportsAllCC in CA-ParametersNR. simultaneousCSI-ReportsAllCC indicates whether the UE supports the CSI reporting framework and the number of CSI reports that the UE can process simultaneously across all CCs (across the master cell group (MCG) and secondary cell group (SCG) in the case of NR-DC). CSI reports are capable of periodic, semi-persistent, and aperiodic CSI, arbitrary delay levels, and codebook types. CSI reports in simultaneousCSI-ReportsAllCC include beam reports and CSI reports. This parameter is also limited by simultaneousCSI-ReportsPerCC and Phy-ParametersFRX-Diff in MIMO-ParametersPerBand for each band in a given band combination.

[0230] Support N in UE CPU In the case of simultaneous CSI calculations, it is assumed that the UE has N processes for CSI reporting. CPU In the case where L CPUs are occupied in the calculation of the CSI report within a given OFDM symbol, the UE has N CPU -L unused CPUs. CPU - On the same OFDM symbol where L CPUs are not occupied, N CSI reports occupy separate CPUs and start with O for each CSI report n=0, ..., N-1 in the N CSI reports. CPU （n） (For the number of CPUs consumed by CSI report n) In the corresponding case, the UE does not need to update (calculate, process) the lowest priority (highest priority value Pri) from the priority rule iCSI (y, k, c, s)). Here, 0≤M≤N is Σ n=0 M-1 O CPU （n） ≤N CPU -L The maximum value that holds.

[0231] UE does not assume that the accompanying CPU The CSI report processing consumes 0, 1, or more CPUs (0, 1, or more CPUs) as shown in the following processes 1 to 3. CPU, CPU consumption).

[0232] -Process 1

[0233] In the case of setting CSI reporting with CSI-ReportConfig and CSI-RS-ResourceSet, CPU =0, wherein the CSI-ReportConfig is accompanied by the higher-layer parameter reportQuantity set to 'none', and the CSI-RS-ResourceSet is accompanied by the higher-layer parameter trs-Info.

[0234] -Processing 2 (Beam Management)

[0235] In the CSI report accompanying CSI-ReportConfig, O CPU = 1, this CSI-ReportConfig is accompanied by the higher-layer parameter reportQuantity set to 'cri-RSRP', 'ssb-Index-RSRP', 'cri-SINR', 'ssb-Index-SINR', 'cri-RSRP-Capability[Set]Index', 'ssb-Index-RSRP-Capability[Set]Index', 'cri-SINR-Capability[Set]Index', 'ssb-Index-SINR-Capability[Set]Index', or 'none' (when the CSI-RS-ResourceSet accompanied by the higher-layer parameter trs-Info is not set).

[0236] -Process 3

[0237] In the CSI report accompanying CSI-ReportConfig, O CPU The following processes 3-1 to 3-3 are followed, wherein the CSI-ReportConfig is accompanied by a higher layer parameter reportQuantity set to 'cri-RI-PMI-CQI', 'cri-RI-i1', 'cri-RI-i1-CQI', 'cri-RI-CQI', or 'cri-RI-LI-PMI-CQI'.

[0238] --Process 3-1 (the situation where the UE can use the maximum limit of UE capabilities)

[0239] In the following cases, O CPU =N CPU :In max{μ PDCCH , μ CSI-RS, μ UL}≤3, and L=0 CPUs are occupied, a PUSCH is not accompanied by at least one of the transport blocks and HARQ-ACKs, and a CSI report is triggered aperiodically. The CSI corresponds to a single CSI with wideband frequency-granularity and four or fewer CSI-RS ports within a single resource. The four or fewer CSI-RS ports within a single resource are not accompanied by a CRI report. The codebookType is set to 'typeI-SinglePanel' and the reportQuantity is set to 'cri-RI-CQI'. PDCCH μ is the subcarrier spacing (SCS) setting of PDCCH. CSI-RS μ is the SCS setting of CSI-RS. UL It is the SCS setting of the UL BWP where the CSI report is sent.

[0240] --Process 3-2 (NCJT CSI situation)

[0241] When CSI-ReportConfig with codebookType set to 'typeI-SinglePanel' is configured and the corresponding CSI-RS resource set for channel measurement is configured with 2 resource groups and N resource pairs, CPU = X·N+M. Here, X is the number of CPUs occupied by the pair of CMRs following the UE capability. UE capability mTRP-CSI-numCPU-r17 indicates the number of CPUs occupied by the pair of CMRs for NCJT CSI hypotheses. S = K1 + K2 resources in the channel measurement NZP CSI-RS resource set, for M1 resources and M2 resources associated with CRI values ​​for resource group 1 with K1 resources and resource group 2 with K2 resources, M = M1 + M2.

[0242] --Process 3-3

[0243] In other cases, O CPU =K S .K S It is the number of CSI-RS resources in the CSI-RS resource set used for channel measurement.

[0244] In the CSI report accompanying CSI-ReportConfig, one or more CPUs are occupied between the following multiple OFDM symbols (CPU occupation duration), wherein CSI-ReportConfig is accompanied by a higher layer parameter reportQuantity not set to 'none'.

[0245] For a P-CSI report or SP-CSI report, the last CSI-RS / CSI-IM / SSB opportunity within multiple CSI-RS / CSI-IM / SSB resources used for channel or interference measurement occupies one or more CPUs from the first symbol of the earliest resource within the resources preceding the corresponding CSI reference resource to the last symbol of the PUSCH / PUCCH configured to transmit the report (CPU Occupation Duration 1). This P-CSI report or SP-CSI report excludes the first SP-CSI report on the PUSCH following the PDCCH that triggered the report. The time during which this P-CSI report or SP-CSI report occupies one or more CPUs may also be referred to as CPU Occupation Duration 1.

[0246] The A-CSI report occupies one or more CPUs from the first symbol following the PDCCH that triggered the CSI report to the last symbol of the PUSCH / PUCCH configured for transmission (CPU Occupation Duration 2). If the PDCCH reception includes two corresponding PDCCH candidates from two search space sets, the PDCCH candidate that ends later in the two search space sets is used to determine the CPU Occupation Duration. The period during which the A-CSI report occupies one or more CPUs is also referred to as CPU Occupation Duration 2.

[0247] The initial SP-CSI report on the PUSCH following a PDCCH trigger occupies at least one CPU from the first symbol following the PDCCH until the last symbol of the PUSCH scheduled to transmit the report (CPU Occupancy Duration 3). If the PDCCH reception includes two corresponding PDCCH candidates from two search space sets, the CPU Occupancy Duration is determined using the later of the two PDCCH candidates. The time that the SP-CSI report occupies at least one CPU is also referred to as CPU Occupancy Duration 3.

[0248] In any time slot, the UE is not expected to have more active CSI-RS ports or active CSI-RS resources within the active BWP than the number reported as capability. NZP CSI-RS resources are active for the duration (duration of time, active duration) defined below.

[0249] The duration for an A-CSI-RS starts from the end of the PDCCH containing the request and ends when the scheduled PUSCH containing the report associated with the A-CSI-RS ends.

[0250] The duration for the SP-CSI-RS starts at the end of the time when the activation command is applied and ends at the end of the time when the deactivation command is applied.

[0251] The duration for a P-CSI-RS starts when the P-CSI-RS is configured by higher layer signaling and ends when the P-CSI-RS configuration is released.

[0252] When a CSI-RS resource is referenced by N CSI report configurations, the CSI-RS resource and the CSI-RS ports within the CSI-RS resource are counted N times.

[0253] The P-CSI-RS is always counted as an active CSI-RS regardless of whether it is received in the OFDM symbol.

[0254] The UE reports UE capability information (codebookParameter) related to the codebook for CSI reporting for each band.

[0255] The codebookParameter indicates the codebook (type) and the corresponding parameters supported by the UE. Reporting parameters corresponding to Type 1 single-panel is mandatory. Reporting parameters corresponding to Type 1 multi-panel, Type 2, and Type 2 port selection is optional. The parameter may also include at least one of maxNumberTxPortsPerResource, maxNumberResourcesPerBand, and totalNumberTxPortsPerBand. maxNumberTxPortsPerResource indicates the maximum number of transmit ports within a resource. maxNumberResourcesPerBand indicates the maximum number of resources used simultaneously across all CCs within a band. totalNumberTxPortsPerBand indicates the maximum number of transmit ports used simultaneously across all CCs within a band.

[0256] (Doppler CSI measurement)

[0257] Research is underway to expand and enhance CSI reporting capabilities for high- and medium-speed UEs by leveraging time-domain correlation and Doppler-domain information. For example, research is underway to improve the Rel.16 / 17 Type 2 codebook, without changing the spatial or frequency domain basis, to allow UEs to report time-domain channel properties (TDCP) measured via the Tracking RS (TRS) CSI-RS.

[0258] The channel coherent time (CCT) depends on the maximum Doppler shift. The channel coherence time is the time during which the measured channel characteristics can be utilized, or the time until they become unusable (channel aging). The maximum Doppler shift is estimated from the relative velocity between the transmitter and receiver. c By 1 / Δf max Here Δf max =v / λ. As the UE's speed increases, the channel coherence time decreases. For example, at a carrier frequency of 4.5 GHz, if the speed exceeds approximately 25 km / h, the channel coherence time drops below 10 ms. Coping with such high speeds and short channel coherence times presents a challenge.

[0259] TRS is supported to track Doppler shift, but TRS has the following problems.

[0260] The number of ports per CSI-RS resource set is limited to only 1. Each CSI-RS resource uses a single port.

[0261] The cycle that can be set is 10ms or longer.

[0262] CSI reporting for TRS is not assumed. There is no reporting configuration for P-TRS. Although reporting can be configured, the reporting quantity (reportQuantity) is set to 'none'. A maximum of 16 CSI-RS resources are used per CSI-RS resource set.

[0263] TRSs are configured in time and frequency domain resources. To measure the impact of Doppler shift, multiple RSs in the time domain are required within specific frequency domain resources.

[0264] Consider utilizing CMR in measurements based on the influence of Doppler shift. However, the RS used for measurement depends on the actual UE installation.

[0265] The CSI reported quantities do not support information related to Doppler shift. The UE reports the information used to determine W = W1W2 via the CSI codebook (PMI). Here, W1 is the wideband characteristic, representing the spatial beam. W2 is the subband characteristic, representing the amplitude / phase coefficients for each spatial beam.

[0266] Regarding measurements related to Doppler shift, consider case 1, where the UE performs measurements based on the CSI-RS, and case 2, where the base station performs measurements based on the SRS. Regarding determination of the impact of Doppler shift, consider case 1-1, where the UE makes a determination based on CSI-RS measurement results, case 1-2, where the base station makes a determination based on CSI-RS measurement results reported by the UE, and case 2-1, where the base station makes a determination based on SRS measurement results.

[0267] (Bitmap used to indicate the location of NZCs in Doppler CSI)

[0268] In the improvement of Type 2 for high / medium speed, the following support is being studied regarding the bitmap for indicating the positions of NZCs.

[0269] Import Q different 2D bitmaps representing the positions of NZCs ( Figure 9 Here, the qth (q = 1, ..., Q) 2D bitmap corresponds to the qth selected Doppler domain (DD) specification vector. The number of selected DD basis vectors is represented by Q. The Q different 2D bitmaps imply that the positions of the NZCs in the 2D SD-FD can be different for different selected DD basis vectors in each layer.

[0270] (analyze)

[0271] It is unclear whether CSI omission related to bitmaps is supported. If such an operation is not clear, there is a concern that throughput and communication quality may be reduced.

[0272] The overhead of Q different two-dimensional bitmaps is a problem. To reduce this overhead, it's unclear whether CSI omission related to the bitmap indicating the positions of NZCs should be supported. Consider limiting the number of NZCs across all DD basis vectors or limiting the number of NZCs per DD basis vector. If this behavior is unclear, there's a concern that throughput and communication quality may be reduced.

[0273] Therefore, the inventors of the present invention have conceived a method for setting / reporting multi-TRP CJT CSI.

[0274] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, each of the following embodiments (for example, each case) can be applied independently or in combination of at least two.

[0275] 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."

[0276] 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.

[0277] 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) Control Elements (CEs), update commands, and activation / deactivation commands may also be overwritten.

[0278] 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 or a combination thereof.

[0279] 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)).

[0280] 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.

[0281] In this disclosure, a b c , a_b^c can also be rewritten. In this disclosure, a b , a_b can also be rewritten to each other. 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.

[0282] In the present disclosure, basis, DFT basis, basis vector, and DFT basis vector can also be replaced with each other. In the present disclosure, SD basis, SD-DFT basis, beam, SD beam, SD vector, SD 2D-DFT vector, and SD basis vector can also be replaced with each other. In the present disclosure, L, the number of SD beams, the number of beams, and the number of SD 2D-DFT vectors can also be replaced with each other. In the present disclosure, FD basis, FD-DFT basis, f i , FD beam, FD vector, FD basis vector, and FD-DFT basis vector can also be rewritten to each other.

[0283] In the present disclosure, the terms "co-phasing coefficient," "LC coefficient," "subband complex LC coefficient," and "co-phasing coefficient matrix" may be overwritten. In the present disclosure, "co-phasing," "phase integration," "phase compensation," "phase adjustment," "phase difference," "phase relationship," "phase combining," and "phase" may be overwritten. In the present disclosure, "differential" and "relative" may be overwritten. In the present disclosure, "amplitude" and "amplitude coefficient" may be overwritten. In the present disclosure, "phase" and "phase coefficient" may be overwritten. In the present disclosure, "maximum coefficient," "maximum amplitude coefficient," and "maximum amplitude" may be overwritten. In the present disclosure, "quantization table" and "quantization method" may be overwritten.

[0284] In the present disclosure, size (dimension), length, and quantity can also be replaced with each other.

[0285] In the present disclosure, CJT, mTRP CJT, and CJT mTRP can also be rewritten as each other.

[0286] (Wireless Communication Method)

[0287] In each embodiment, TRP, CMR, NZP-CSI-RS resources, and CRI may also be overwritten. In each embodiment, the groups / sets of CMRs, the groups / sets of NZP-CSI-RS resources, and the groups / sets of CRI may also be overwritten. In each embodiment, the combinations / pairs / sets / groups of TRPs, the combinations / pairs / sets / groups of CMRs, the combinations / pairs / sets / groups of NZP-CSI-RS resources, and the combinations / pairs / sets / groups of CRI may also be overwritten.

[0288] In various embodiments, the number of TRPs used for CJT, the number of CSI-RS resources used for CJT CSI, N, N TRP ,X,N g In each embodiment, X TRP, X-TRP, X panels, N g In each embodiment, CJTs using X TRPs, CJTs using X panels, and X-TRP CJTs can also be overwritten with each other.

[0289] In each embodiment, the reference CSI, the CSI corresponding to the reference TRP, and the first reported CSI may also override each other. In each embodiment, the reference TRP, the CSI corresponding to the reference CSI, the TRP corresponding to the first reported CSI, and the CSI-RS resource / CMR / CMR group / CSI-RS resource set corresponding to the first reported CSI may also override each other. In each embodiment, the TRP, CSI-RS resource, CMR, CMR group, and CSI-RS resource set may also override each other.

[0290] In each embodiment, a parameter related to the SD basis / SD basis vector, the number of beams L, a codebook parameter α, a codebook parameter setting, a parameter combination, a parameter, a parameter related to the number of SD basis vectors, a parameter related to the number of beams, one or more parameters related to the number of SD basis vectors for multiple transmission points, LL, LL for TRP#i (i=1, 2, ...) i , LL common to multiple TRPs, LL across multiple TRPs tot , multiple parameters LL corresponding to multiple TRP#i i , SD basis vector number, L value, and L parameter can also be rewritten mutually.

[0291] In various embodiments, a single TRP may mean that only one CMR is set, or that a CMR from one TRP is set, or that N TRPs are used to report the TRP selected by the UE. TRP The presence of only one '1' value in the bitmap of bits may also mean that the combination of the number of SD basis / SD basis vectors determined has only one non-zero value for one TRP. TRP If there are more than one '1' value in the bitmap, it may also correspond to multiple TRPs. If the determined combination of SD basis / number of SD basis vectors has more than one non-zero value for more than one TRP, it may also correspond to multiple TRPs.

[0292] In each embodiment, the TRP selection indicator, the first indicator, the indicator of the TRP selected by the UE, and the indicator indicating the selected TRP may also be overwritten with each other. In each embodiment, the combination indicator, the second indicator, the indicator of the combination of N L values, the indicator of the combination of N L values ​​corresponding to N TRPs, and the indicator of the combination of multiple values ​​related to the number of SD basis vectors / beams may also be overwritten with each other. In each embodiment, the total number of non-zero amplitude coefficients indicator, the total number of extended non-zero amplitude coefficients indicator, the third indicator, and the indicator related to the number of non-zero amplitude coefficients may also be overwritten with each other.

[0293] In each embodiment, multiple layers or all layers may overwrite each other.

[0294] <Implementation Method #0>

[0295] Provisions related to the contents of CSI Part 1 for CJT CSI (physical layer procedures for data) may also be imported.

[0296] In Type 1, Type 2, Extended Type 2, and Additional Extended Type 2 port selection CSI feedback on the PUSCH, the CSI report consists of two parts. Part 1 has a fixed payload size and is used to identify the number of information bits in Part 2. Part 1 is transmitted in its entirety before Part 2.

[0297] In extended Type 2 CSI feedback and additional extended Type 2 port selection CSI feedback (and CJT CSI), Part 1 may also include (if reported) the RI, (if reported) the TRP selection indicator, (if reported) the combination indicator, (if reported) the CQI, and an indicator of the total number of non-zero amplitude coefficients across multiple layers. The fields of Part 1, namely (if reported) the RI, (if reported) the TRP selection indicator, (if reported) the combination indicator, the CQI, and an indicator of the total number of non-zero amplitude coefficients across multiple layers, may also be coded separately. Part 2 may also include the PMI for extended Type 2 CSI or additional extended Type 2 port selection CSI (or CJT CSI). Parts 1 and 2 may also be coded separately.

[0298] The aforementioned provision of “indicator of the total number of non-zero amplitude coefficients across multiple layers” may also be updated / interpreted as at least one of the following options.

[0299] -Option 1

[0300] The definition of this indicator may also not be updated.In the case of CJT CSI, this indicator may also be interpreted as an indicator of the total number of non-zero amplitude coefficients across multiple layers across the full TRP (full CMR).

[0301] -Option 2

[0302] The specification of this indicator may also be updated to be an indicator of the total number of non-zero amplitude coefficients across multiple layers across each TRP / CMR.

[0303] -Option 3

[0304] The specification of this indicator may also be updated to be an indicator of the total number of non-zero amplitude coefficients across multiple layers for the first TRP / CMR, the second TRP / CMR, the third TRP / CMR, and the fourth TRP / CMR.

[0305] -Option 4

[0306] The specification of the indicator may also be updated to be an indicator of the total number of non-zero amplitude coefficients for each layer across the full TRP. For example, the indicator may also be an indicator of the total number of non-zero amplitude coefficients for the first layer across the full TRP, the total number of non-zero amplitude coefficients for the second layer across the full TRP, the total number of non-zero amplitude coefficients for the third layer across the full TRP, the total number of non-zero amplitude coefficients for the fourth layer across the full TRP, and so on.

[0307] -Option 5

[0308] The specification of this indicator may also be updated as an indicator of the total number of non-zero amplitude coefficients per TRP / CMR, per layer.

[0309] -Option 6

[0310] The specification of this indicator may be the existing specification (option 1) with the addition of the specification of option 2 / 3 / 4 / 5.

[0311] The indicator for option 1 can also have a single value. The indicators for options 2 / 3 / 4 / 5 can also have multiple values.

[0312] In various embodiments, the indicator of option 1 / 2 / 3 / 4 / 5 may also be referred to as a total non-zero amplitude coefficient indicator. In various embodiments, the indicator of option 2 / 3 / 4 / 5 may also be referred to as an extended total non-zero amplitude coefficient indicator.

[0313] According to this embodiment, the UE is able to appropriately report part 1 of the multi-TRP CJT CSI report.

[0314] <Implementation Method #1>

[0315] This embodiment involves a bitmap indicating the locations of NZCs for CJT CSI.

[0316] Figure 10 This section shows an example of operations according to Embodiment #1. At S110, the UE determines whether the conditions for bitmap omission are met. If the conditions for bitmap omission are met (S110: Y), at S120, the UE does not report the bitmap indicating the positions of the NZCs used for CJT CSI. If the conditions for bitmap omission are not met (S110: N), at S130, the UE reports the bitmap indicating the positions of the NZCs used for CJT CSI.

[0317] The bitmap representing the locations of NZCs for CJT CSI may also follow at least one of the following options.

[0318] -Option 1

[0319] The number of reported NZCs across the full TRP and multiple layers with v≤2 is the same as the maximum number Σ n=1 N_sel Σ l=1 v 2L n M l，n In the case of equality, in l=1,...,v, the bitmap indicating the positions of NZCs for all TRPs and layer l is not reported. Here, N_sel can also be the number of TRPs selected / reported by the UE. v can also be the total rank number.

[0320] This option can also be applied in the case where the reported number of NZCs across all TRPs and across all layers is reported in CSI part 1. In the case where all NZCs need to be reported, the bitmap does not need to be reported since it shows all ones.

[0321] In CJT CSI Mode 2, M l，n =M n , the maximum number of NZCs reported can also be Σ n=1 N_sel 2L n M n v.

[0322] -Option 2

[0323] When v≤2, and the number of reported NZCs across multiple layers for a TRP#n is equal to the maximum number Σ l=1 v 2L n M l，n or (in the case of CJT CSI Mode 2) 2L n M n In the case of v, in l=1, ..., v, the bitmap indicating the positions of NZCs for TRP#n and layer 1 is not reported. Here, n can also be a TRP index.

[0324] This option can also be applied in the case where the reported number of NZCs across all layers per TRP is reported in CSI Part 1.

[0325] - Changes to option 1 / 2

[0326] Under the conditions of option 1 / 2, whether to report the bitmap can also be set through higher-layer signaling.

[0327] In the case of options 1 / 2, a bitmap can also be reported.

[0328] In CJT CSI based on extended type 2 CSI (Rel.16), L nIt can also be the number of SD basis vectors selected / reported for TRP#n. In CJT CSI based on the additional extended type 2PS CSI (Rel.17), 2L in Option 1 / 2 n It can also be rewritten as K n Here, K n =αP CSI-RS It can also be the number of selected / reported CSI-RS ports.

[0329] A UE capability indicating support of Option 1 / 2 for CJT CSI based on at least one of extended Type 2 CSI (Rel. 16) and additional extended Type 2 PS CSI (Rel. 17) may also be introduced.

[0330] According to this embodiment, the UE can appropriately decide whether to report the bitmap indicating the positions of NZCs for CJT CSI.

[0331] <Implementation Method #2>

[0332] This embodiment involves a bitmap representing the locations of NZCs for Doppler CSI.

[0333] Figure 11 This section shows an example of operations according to Embodiment #2. At S210, the UE determines whether the bitmap omission condition is met. If the bitmap omission condition is met (S210: Y), at S220, the UE does not report the bitmap indicating the positions of the NZCs used for Doppler CSI. If the bitmap omission condition is not met (S210: N), at S230, the UE reports the bitmap indicating the positions of the NZCs used for Doppler CSI.

[0334] The bitmap representing the locations of NZCs for Doppler CSI may also follow at least one of the following options.

[0335] -Option 1

[0336] The number of reported NZCs for v≤1 / 2 / 3 / 4 and across all DD basis vectors and multiple layers is equal to the maximum number Σ q=1 Q Σ l=1 v 2L q M l，q =Σ l=1 v 2LM l In the case of Q, the Q bitmaps representing the positions of the NZCs for all DD basis vectors and layer l are not reported in l = 1, ..., v. Here, Q can also be the number of DD basis vectors. The Q DD basis vectors can also have the same SD-FD pair.

[0337] This option can also be applied in the case where the reported number of NZCs across the full DD basis vectors and multiple layers is reported in CSI part 1. In the case where all NZCs need to be reported, the bitmap does not need to be reported since it shows all ones.

[0338] The condition v≤1 / 2 / 3 / 4 may also be associated with a maximum allowed number of NZCs for rank v.

[0339] When M is imported that is common to multiple layers, the maximum number of reported NZCs may be 2LMvQ.

[0340] -Option 2

[0341] In v≤1 / 2 / 3 / 4, and for DD basis vector #q (qth DD basis vector), the number of reported NZCs across DD basis vector #q and multiple layers is equal to the maximum number Σ l=1 v 2L q M l，q Or in the case of 2LMv, in l=1, ..., v, the bitmap indicating the positions of the NZCs for the DD basis vector #q and layer 1 is not reported. Here, M may also be the number of FD basis vectors common to multiple layers.

[0342] This option can also be used in cases where the reported number of NZCs across multiple layers for each DD basis vector is reported in CSI Part 1.

[0343] - Variations of Option 1

[0344] In v≤1 / 2 / 3 / 4, and for all DD basis vectors and level l, the number of reported NZCs is equal to the maximum number Σ q=1 Q 2L q M l，q or 2LM l In the Q case, in l=1, ..., v, the Q bitmaps representing the positions of the NZCs for the full DD basis vectors and layer l are not reported.

[0345] This option can also be applied in the case where the reported number of NZCs for each layer across the full DD basis vectors is reported in CSI Part 1.

[0346] - Variations of Option 2

[0347] In v≤1 / 2 / 3 / 4, and for DD basis vector #q, the number of reported NZCs for DD basis vector #q and layer l is equal to the maximum number 2LM lIn the case of , in l=1, ..., v, the bitmap indicating the positions of the NZCs for the DD basis vector #q and layer l is not reported.

[0348] This option can also be applied in the case where the reported number of NZCs per layer per DD basis vector is reported in CSI Part 1.

[0349] - Changes to option 1 / 2

[0350] Under option 1 / 2, whether to report the bitmap can also be set through higher layer signaling.

[0351] In the case of options 1 / 2, a bitmap can also be reported.

[0352] In Doppler CSI based on extended type 2 CSI (Rel.16), L can also be the number of SD basis vectors selected / reported for a certain DD basis vector. In Doppler CSI based on additional extended type 2 PS CSI (Rel.17), 2L in options 1 / 2 can also be rewritten as K. Here, K = αP CSI-RS It can also be the number of selected / reported CSI-RS ports.

[0353] A UE capability indicating support of Option 1 / 2 for Doppler CSI based on at least one of extended Type 2 CSI (Rel. 16) and additional extended Type 2 PS CSI (Rel. 17) may also be introduced.

[0354] According to this embodiment, the UE can appropriately decide whether to report the bitmap indicating the positions of NZCs for Doppler CSI.

[0355] <Supplement>

[0356] [Notification of information to UE]

[0357] In the above-mentioned embodiment, notification of arbitrary information from the network (NW) (e.g., from a base station (BS)) to the UE (in other words, reception of arbitrary information from the BS in the UE) may also be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PDCCH, PDSCH, reference signals), or a combination thereof.

[0358] 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 specifications in the MAC subheader.

[0359] When the above notification is performed through DCI, the above notification may be performed through a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used in scrambling cyclic redundancy check (CRC) bits assigned to the DCI, the format of the DCI, and the like.

[0360] In addition, notification of any information in the above-mentioned embodiments to the UE may be performed periodically, semi-continuously, or aperiodically.

[0361] [Notification of information from UE]

[0362] 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.

[0363] 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 specifications in the MAC subheader.

[0364] When the notification is performed through UCI, the notification may be transmitted using PUCCH or PUSCH.

[0365] Furthermore, the notification of arbitrary information from the UE in the above-mentioned embodiments may be performed periodically, semi-continuously, or aperiodically.

[0366] [Regarding the application of each embodiment]

[0367] At least one of the above embodiments may also be applied when a specific condition is met, which may be specified in the specification or notified to the UE / BS using higher layer signaling / physical layer signaling.

[0368] At least one of the above-mentioned embodiments may also be applied only to a UE that reports a specific UE capability (UE capability) or supports the specific UE capability.

[0369] The specific UE capability may also indicate at least one of the following:

[0370] Supporting specific processing / actions / controls / information related to at least one of the above embodiments.

[0371] Support for CJT CSI based on at least one of extended type 2 CSI (Rel. 16) and additional extended type 2 PS CSI (Rel. 17).

[0372] Support for Doppler CSI based on at least one of extended type 2 CSI (Rel. 16) and additional extended type 2 PS CSI (Rel. 17).

[0373] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied across 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 feature set per component carrier (Feature Set Per Component-carrier (FSPC)).

[0374] Furthermore, the specific UE capability may be a capability applied across all duplex modes (commonly regardless of the duplex mode) or a capability for each duplex mode (eg, time division duplex (TDD) or frequency division duplex (FDD)).

[0375] Furthermore, at least one of the aforementioned embodiments may also be applied when specific information associated with the aforementioned embodiment (or actions of the aforementioned embodiment) is configured / activated / triggered by the UE through higher layer signaling / physical layer signaling. For example, the specific information may be information indicating activation of actions of the aforementioned embodiment, arbitrary RRC parameters for a specific release (e.g., Rel. 18 / 19), etc.

[0376] Even if the UE does not support at least one of the above-mentioned specific UE capabilities or is not configured with the above-mentioned specific information, the UE may apply operations such as Rel.15 / 16.

[0377] (Note)

[0378] The following inventions are added to one embodiment of the present disclosure.

[0379] [Note 1]

[0380] A terminal having:

[0381] a receiving unit, receiving a setting of coherent joint transmission CSI; and

[0382] The control unit determines, based on the setting, whether to report a bitmap indicating positions of non-zero coefficients used for the coherent joint transmission of CSI.

[0383] [Note 2]

[0384] The terminal as described in Supplement 1, wherein:

[0385] The control unit decides whether to report the bitmap based on conditions of the rank number and the reported number of non-zero coefficients.

[0386] [Note 3]

[0387] The terminal as described in Supplement 1 or Supplement 2, wherein:

[0388] The number of reports is the number of reports of non-zero coefficients across all transmission and reception points and multiple layers for the coherent joint transmission of CSI.

[0389] [Note 4]

[0390] The terminal according to any one of Supplement 1 to Supplement 3, wherein:

[0391] The reported number is the reported number of non-zero coefficients across one transmission / reception point and multiple layers for the coherent joint transmission CSI.

[0392] (Note)

[0393] The following inventions are added to one embodiment of the present disclosure.

[0394] [Note 1]

[0395] A terminal having:

[0396] a receiving unit, receiving a setting of a Doppler CSI; and

[0397] The control unit determines whether to report a bitmap indicating positions of non-zero coefficients for the Doppler CSI based on the setting.

[0398] [Note 2]

[0399] The terminal as described in Supplement 1, wherein:

[0400] The control unit decides whether to report the bitmap based on conditions of the rank number and the reported number of non-zero coefficients.

[0401] [Note 3]

[0402] The terminal as described in Supplement 1 or Supplement 2, wherein:

[0403] The reported number is the reported number of non-zero coefficients across all Doppler domain basis vectors and multiple layers.

[0404] [Note 4]

[0405] The terminal according to any one of Supplement 1 to Supplement 3, wherein:

[0406] The reported number is the reported number of non-zero coefficients across one Doppler domain basis vector and multiple layers.

[0407] (Wireless Communication System)

[0408] 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.

[0409] Figure 12 This figure shows an example of a schematic configuration of a wireless communication system according to one embodiment. Wireless communication system 1 (may also be simply referred to as system 1) may be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP) or the fifth-generation mobile communication system New Radio (5G NR).

[0410] 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.

[0411] 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.

[0412] 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)).

[0413] 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.

[0414] 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).

[0415] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). Macrocell C1 may be included in FR1, and small cell C2 may be included in FR2. For example, FR1 may be a frequency band below 6 GHz (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). The frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may correspond to a frequency band higher than FR2.

[0416] 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.

[0417] 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.

[0418] 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).

[0419] The core network 30 may also include, for example, 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 also be performed via the DN.

[0420] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0421] 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.

[0422] 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.

[0423] As downlink channels, the wireless communication system 1 may use a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20 , a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc.

[0424] In addition, as uplink channels, the wireless communication system 1 can also use 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.

[0425] User data, higher-layer control information, and system information blocks (SIBs) are transmitted via the PDSCH. User data and higher-layer control information can also be transmitted via the PUSCH. Furthermore, the Master Information Block (MIB) can also be transmitted via the PBCH.

[0426] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

[0427] 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.

[0428] 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. Based on the search space configuration, the UE can monitor the CORESETs associated with a particular search space.

[0429] 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.

[0430] 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.

[0431] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” Furthermore, various channels may be expressed without the word “physical” at the beginning.

[0432] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), and the like may also be transmitted. As DL-RSs, 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.

[0433] 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.

[0434] 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).

[0435] (Base Station)

[0436] Figure 13 This figure shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission 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.

[0437] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also conceivable that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0438] 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.

[0439] 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.

[0440] 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.

[0441] 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.

[0442] 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.

[0443] 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.

[0444] 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.

[0445] The transmitting and receiving unit 120 (transmitting processing unit 1211) may perform processing at the Packet Data Convergence Protocol (PDCP) layer, processing at the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing at 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.

[0446] 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.

[0447] 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 .

[0448] Meanwhile, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing (filtering), and demodulation into baseband signals on the radio frequency band signals received via the transmitting and receiving antenna 130 .

[0449] 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), filter processing (filtering 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.

[0450] The transmitting / receiving unit 120 (measuring unit 123) may also perform measurements related to received signals. For example, the measuring unit 123 may also 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.

[0451] 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 obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0452] 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 .

[0453] 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 constraint and a codebook subset constraint. The control unit 110 may also be configured to apply the one or more parameters in the coherent joint transmission of CSI and control reception of the CSI report.

[0454] In addition, the transmitting and receiving unit 120 may also transmit a configuration for coherent joint transmission of CSI. The control unit 110 may also determine whether to receive a bitmap indicating the positions of non-zero coefficients used for the coherent joint transmission of CSI based on the configuration.

[0455] Furthermore, the transmitting and receiving unit 120 may transmit the setting of the Doppler CSI. The control unit 110 may also determine whether to receive a bitmap indicating the positions of non-zero coefficients used for the Doppler CSI based on the setting.

[0456] (User Terminal)

[0457] Figure 14 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, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided in one or more units.

[0458] 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.

[0459] 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.

[0460] 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.

[0461] 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.

[0462] 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.

[0463] 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.

[0464] 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.

[0465] 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.

[0466] 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, and generate a bit string to be transmitted.

[0467] 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 (filtering 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.

[0468] Furthermore, whether DFT processing is applied 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.

[0469] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing (filtering), 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 .

[0470] Meanwhile, the transmitting and receiving unit 220 (RF unit 222 ) may also perform amplification, filter processing (filtering processing), and demodulation into a baseband signal on the radio frequency band signal received via the transmitting and receiving antenna 230 .

[0471] 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 (filtering 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, and obtain user data, etc.

[0472] 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), etc. The measurement results may also be output to the control unit 210.

[0473] 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, etc. In addition, CSI-IM may 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.

[0474] 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 .

[0475] In addition, the transmitting and receiving unit 220 may also receive a configuration for coherent joint transmission of CSI. The control unit 210 may also determine whether to report a bitmap indicating the positions of non-zero coefficients used for the coherent joint transmission of CSI based on the configuration.

[0476] The control unit 210 may also decide whether to report the bitmap based on the conditions of the rank number and the reported number of non-zero coefficients.

[0477] The reported number may also be the reported number of non-zero coefficients across all transmission and reception points and multiple layers for the coherent joint transmission of CSI.

[0478] The reported number may also be the reported number of non-zero coefficients across one transmission / reception point and multiple layers for the coherent joint transmission of CSI.

[0479] Furthermore, the transmitting / receiving unit 220 may receive a setting of Doppler CSI. Based on the setting, the control unit 210 may determine whether to report a bitmap indicating the positions of non-zero coefficients used for the Doppler CSI.

[0480] The control unit 210 may also decide whether to report the bitmap based on the conditions of the rank number and the reported number of non-zero coefficients.

[0481] The reported number may also be the reported number of non-zero coefficients across all Doppler domain basis vectors and multiple layers.

[0482] The reported number may also be the reported number of non-zero coefficients across a Doppler domain basis vector and multiple layers.

[0483] (Hardware structure)

[0484] 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.

[0485] Functions include, but are 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 functions are as described above, and their implementation methods are not particularly limited.

[0486] 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 15 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 the 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.

[0487] 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.

[0488] 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.

[0489] 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.

[0490] 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.

[0491] 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.

[0492] 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.

[0493] 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 Read-Only Memory (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.

[0494] 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 physically or logically separated by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0495] 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).

[0496] 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 between the devices.

[0497] 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.

[0498] (Variation)

[0499] 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. A reference signal may also be referred to as RS, or as a pilot, pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, frequency carrier, carrier frequency, etc.

[0500] 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.

[0501] 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.

[0502] 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.

[0503] 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 mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

[0504] 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.

[0505] 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.

[0506] 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.

[0507] 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.

[0508] 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.

[0509] 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.

[0510] 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.

[0511] 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.

[0512] 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.

[0513] 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.

[0514] 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.

[0515] A Bandwidth Part (BWP) (also known 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.

[0516] 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.

[0517] 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 other than the activated BWP.

[0518] 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 modified in various ways.

[0519] 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.

[0520] The names used for parameters, etc. in this disclosure are not intended to be limiting in any respect. Furthermore, the mathematical formulas used 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.

[0521] 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.

[0522] 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.

[0523] 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.

[0524] 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.

[0525] 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).

[0526] 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).

[0527] 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).

[0528] 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.

[0529] 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.

[0530] The terms "system" and "network" used in this disclosure are interchangeable. "Network" may also refer to devices included in the network (eg, base stations).

[0531] 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.

[0532] 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.

[0533] 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.

[0534] 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.

[0535] 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.

[0536] 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.

[0537] In the present disclosure, index, identifier (ID), indicator, indication, resource ID, etc. may also be replaced by each other. In the present disclosure, sequence, list, set, group, group, cluster, subset, etc. may also be replaced by each other.

[0538] 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 set 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.

[0539] 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.

[0540] 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.

[0541] In the present disclosure, the base station sends information to the terminal, and this situation can also be rewritten as the base station instructing the terminal to control / operate based on the information.

[0542] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (UE)”, and “terminal” can be used interchangeably.

[0543] 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.

[0544] 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.

[0545] 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, multicopters, quadcopters, hot air balloons, and objects carried on them, but is not limited to these. In addition, the mobile body can also be a mobile body that moves autonomously based on operating instructions.

[0546] 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.

[0547] Figure 16 This diagram 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.

[0548] 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 handle), and steers at least one of the front wheels 46 and the rear wheels 47 based on the user's operation of the steering wheel.

[0549] 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 electronic control unit (ECU).

[0550] As signals from various sensors 50-58, there are current signals from the current sensor 50 that senses the current of the motor, speed signals of the front wheels 46 / rear wheels 47 obtained by the speed sensor 51, air pressure signals of the front wheels 46 / rear wheels 47 obtained by the air pressure sensor 52, vehicle speed signals obtained by the vehicle speed sensor 53, acceleration signals obtained by the acceleration sensor 54, depression amount signals of the accelerator pedal 43 obtained by the accelerator pedal sensor 55, depression amount signals of the brake pedal 44 obtained by the brake pedal sensor 56, operation signals of the shift lever 45 obtained by the shift lever sensor 57, detection signals for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 58, etc.

[0551] Information service unit 59 is comprised of various devices, such as a navigation system, audio system, speakers, display, television, and radio, that provide (output) various types of information, including driving information, traffic information, and entertainment information, and one or more ECUs that control these devices. Information service unit 59 uses information acquired from external devices via communication module 60 and the like to provide various information and services (e.g., multimedia information and multimedia services) to vehicle 40 occupants.

[0552] 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.).

[0553] The driving assistance system unit 64 is composed of various devices that provide functions for preventing accidents or reducing the driver's driving burden, such as millimeter-wave radar, light detection and ranging (LiDAR), cameras, positioners (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyroscope systems (e.g., 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. Furthermore, the driving assistance system unit 64 transmits and receives various information via the communication module 60 to implement driving assistance functions or autonomous driving functions.

[0554] 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 with 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.

[0555] 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 with the external device 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 function as at least one of the base station 10 and user terminal 20).

[0556] 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, 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, etc. 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.

[0557] The communication module 60 receives various information (such as traffic information, traffic light information, and vehicle information) transmitted from external devices and displays it on the vehicle's information service unit 59. The information service unit 59 can also be referred to as an output unit that outputs information (for example, information output to a display, speaker, or other device based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0558] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 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.

[0559] 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.

[0560] 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.

[0561] In this disclosure, actions performed by a base station may also be performed by its upper node depending on the situation. 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.

[0562] 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.

[0563] 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 these that are extended, modified, generated, or specified. Furthermore, multiple systems may be combined for application (for example, LTE or LTE-A combined with 5G).

[0564] 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.”

[0565] 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.

[0566] 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."

[0567] 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)”.

[0568] 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.

[0569] Furthermore, in this disclosure, "determine / determining" can be rephrased as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "do not assume..." can be rephrased as "do not assume...".

[0570] In this disclosure, "expect" and "be expected" can be interchanged. For example, "expect(s)..." ("..." can also be expressed as a that-clause, a to-infinitive, etc.) and "be expected..." can be interchanged. "Does not expect..." and "Does not expect..." can be interchanged. Furthermore, "An apparatus A is not expected..." and "An apparatus B other than apparatus A does not expect..." can be interchanged (for example, if apparatus A is a UE, apparatus B can also be a base station).

[0571] The “maximum transmit power” described in the present disclosure may refer to the maximum value of the transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0572] As used in this disclosure, the terms "connected," "coupled," or all variations thereof, refer to any direct or indirect connection or coupling between two or more elements, including 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."

[0573] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples to be "connected" or "combined" to each other.

[0574] 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."

[0575] 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.

[0576] 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.

[0577] In the present disclosure, "below," "less than," "above," "more than," "equal to," and the like may be replaced with one another. Furthermore, in the present disclosure, expressions meaning "good," "bad," "big," "small," "high," "low," "early," "late," "wide," and "narrow," etc., are not limited to the positive, comparative, and superlative forms, but may be replaced with one another. Furthermore, in the present disclosure, expressions meaning "good," "bad," "big," "small," "high," "low," "early," "late," "wide," and "narrow," etc., with "i" (where i is an arbitrary integer) are not limited to the positive, comparative, and superlative forms, but may be replaced with one another (for example, "highest" and "i-th highest" may be replaced with one another).

[0578] In the present disclosure, “of,” “for,” “regarding,” “related to,” “associated with,” etc. may also be replaced with each other.

[0579] 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 herein can be interchanged with nouns, verbs, or other expressions appropriate to the context. Furthermore, the time difference between A and B can be substantially zero (immediately after or immediately before). Furthermore, a time offset can be applied to the time at which A occurs. For example, "A" can be interchanged with "before / after the time offset at which A occurs." This time offset (for example, one or more symbols / time slots) may be predetermined or determined by the UE based on notified information.

[0580] In the present disclosure, timing, moment, time, time instance, arbitrary time unit (eg, time slot, sub-time slot, symbol, sub-frame), period, occasion, resource, etc. may also be interchangeable.

[0581] 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 presented for illustrative purposes only and is not intended to limit the inventions disclosed herein.

Claims

1. A terminal comprising: a receiving unit, receiving a setting of a Doppler CSI; and The control unit determines whether to report a bitmap indicating positions of non-zero coefficients for the Doppler CSI based on the setting.

2. The terminal according to claim 1, wherein: The control unit decides whether to report the bitmap based on conditions of the rank number and the reported number of non-zero coefficients.

3. The terminal according to claim 2, wherein: The reported number is the number of non-zero coefficients across all Doppler domain basis vectors and multiple layers. The terminal according to claim 2 , wherein: The reported number is the reported number of non-zero coefficients across one Doppler domain basis vector and multiple layers.

5. A wireless communication method, which is a wireless communication method of a terminal, comprising: The step of receiving a setting of Doppler CSI; and The step of deciding whether to report a bitmap indicating positions of non-zero coefficients for the Doppler CSI based on the setting.

6. A base station comprising: a transmitting unit, configured to transmit a setting of the Doppler CSI; and The control unit determines whether to receive a bitmap indicating positions of non-zero coefficients for the Doppler CSI based on the setting.

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