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 settings for determining parameters relating to the number of spatial domain base vectors for a plurality of transmission points; and a control unit that, on the basis of the setting, controls reporting of spatial domain base vectors for the plurality of transmission points. According to one embodiment of the present disclosure, it is possible to determine an appropriate CSI / codebook for CJT.

Description

Technical Field

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

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

[0003] Subsequent systems of LTE (for example, also referred to as the 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also being studied.

[0004] Prior Art Documents

[0005] Non-Patent Documents

[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), channel state information (CSI) based on reference signal reception is being studied and reported. In addition, DL transmission to a terminal (user terminal, User Equipment (UE)) by multiple transmission / reception points (multiple Transmission / Reception Points (TRPs), Multi-TRP (MTRP)), or multiple panels (multiple panels, multi-panel) is being studied. In addition, coherent joint transmission (CJT) using multi-TRP / multi-panel is being studied.

[0009] However, sufficient research has not been conducted on CSI / codebooks for CJT. If such a method is not clearly defined, there are concerns 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 an appropriate CSI / codebook for CJT.

[0011] Means for Solving the Problem

[0012] A terminal according to one embodiment of the present disclosure includes: a receiving unit that receives a setting for determining a parameter related to the number of spatial domain basis vectors for multiple transmission points; and a control unit that controls reporting of the spatial domain basis vectors for the multiple transmission points based on the setting.

[0013] Advantageous Effects of the Invention

[0014] According to one embodiment of the present disclosure, an appropriate CSI / codebook for CJT can be determined. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0018] Figure 4A And Figure 4BAn example representing the enhanced type 2 port selection codebook.

[0019] Figure 5 An example representing the parameter combination for the Rel.16 type 2 codebook.

[0020] Figure 6 An example representing the parameter combination for the Rel.17 type 2 port selection codebook.

[0021] Figures 7A to 7D An example representing the mapping of CSI part 1.5.

[0022] Figure 8 An example representing bitmap 3 related to Embodiment #A2.

[0023] Figure 9 Another example representing bitmap 3 related to Embodiment #A2.

[0024] Figure 10 An example representing the NZC related to Embodiment #B2.

[0025] Figure 11 Another example representing the NZC related to Embodiment #B2.

[0026] Figure 12 An example representing the combination of Embodiment #C1 and Embodiment #C2.

[0027] Figure 13 A diagram showing an example of the schematic structure of a wireless communication system according to an embodiment.

[0028] Figure 14 A diagram showing an example of the structure of a base station according to an embodiment.

[0029] Figure 15 A diagram showing an example of the structure of a user terminal according to an embodiment.

[0030] Figure 16 A diagram showing an example of the hardware structure of a base station and a user terminal according to an embodiment.

[0031] Figure 17 A diagram showing an example of a vehicle according to an embodiment. Detailed implementation

[0032] (CSI report (CSI report or CSI reporting))

[0033] In Rel.15 NR, a terminal (also referred to as a user terminal, user equipment (UE), etc.) generates (also referred to as determines, calculates, estimates, measures, etc.) channel state information (CSI) based on a reference signal (RS) (or the resources for the RS), and sends (also referred to as reports, feeds back, etc.) the generated CSI to a network (e.g., a base station). The CSI can also be sent to the base station, for example, using an uplink control channel (e.g., a physical uplink control channel (PUCCH)) or an uplink shared channel (e.g., a physical uplink shared channel (PUSCH)).

[0034] The RS used in the generation of CSI can be, for example, at least one of a channel state information reference signal (CSI-RS), a synchronization signal / physical broadcast channel (SS / PBCH) block, a synchronization signal (SS), a demodulation reference signal (DMRS), etc.

[0035] The CSI-RS can also include at least one of a non-zero power (NZP) CSI-RS and CSI-interference management (CSI-IM). The SS / PBCH block is a block that includes an SS and a PBCH (and the corresponding DMRS), and can also be referred to as an SS block (SSB), etc. In addition, the SS can also include at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

[0036] In addition, the CSI may also include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), an SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), L1-SNR (Signal to Noise Ratio), etc.

[0037] The UE may also receive information related to the CSI report (report configuration information) and control the CSI report based on the report configuration information. The report configuration information may also be, for example, the "CSI-ReportConfig" of an Information Element (IE) of Radio Resource Control (RRC). In addition, in the present disclosure, the RRC IE may also be rewritten with the RRC parameters, higher layer parameters, etc.

[0038] The report configuration information (e.g., the "CSI-ReportConfig" of the RRC IE) may also include at least one of the following, for example.

[0039] · Information related to the type of CSI report (report type information, e.g., the "reportConfigType" of the RRC IE).

[0040] · Information related to one or more quantities (quantities) of the CSI to be reported (one or more CSI parameters) (report quantity information, e.g., the "reportQuantity" of the RRC IE).

[0041] · Information related to the RS resources used in the generation of this quantity (this CSI parameter) (resource information, e.g., "CSI-ResourceConfigId" of the RRC IE).

[0042] · Information related to the frequency domain that is the object of the CSI report (frequency domain information, e.g., "reportFreqConfiguration" of the RRC IE).

[0043] For example, the report type information can also indicate (indicate) a periodic CSI (Periodic CSI (P-CSI)) report, an aperiodic CSI (Aperiodic CSI (A-CSI)) report, or a semi-persistent (semi-persistent, semi-permanent) CSI (Semi-Persistent CSI (SP-CSI)) report.

[0044] In addition, the reported quantity information can also specify a combination of at least one of the above CSI parameters (e.g., CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0045] In addition, the resource information can also be the ID of the RS resources. The RS resources can also include, for example, CSI-RS resources with non-zero power or SSBs, as well as CSI-IM resources (e.g., CSI-RS resources with zero power).

[0046] In addition, the frequency domain information can also represent the frequency granularity of the CSI report. The frequency granularity can also include, for example, wideband and subbands. The wideband is the entire CSI reporting band. The wideband can be, for example, the entire certain carrier (Component Carrier (CC), cell, serving cell), or the entire bandwidth part (Bandwidth part (BWP)) within a certain carrier. The wideband can also be alternatively referred to as the CSI reporting band, the entire CSI reporting band, etc.

[0047] In addition, the subband is a part within the wideband and can be composed of one or more resource blocks (Resource Block (RB) or Physical Resource Block (PRB)). The size of the subband can also be determined according to the size of the BWP (number of PRBs).

[0048] The frequency domain information can also indicate which of wideband or subbands the PMI to be reported is for (the frequency domain information can also be included, for example, in the "pmi-FormatIndicator" of the RRC IE used in the decision of either the wideband PMI report or the subband PMI report). The UE can also determine the frequency granularity of the CSI report (i.e., either the wideband PMI report or the subband PMI report) based on at least one of the above-mentioned reported quantity information and the frequency domain information.

[0049] In the case where the wideband PMI report is set (determined), one wideband PMI can also be reported for the entire CSI reporting band. On the other hand, in the case where the subband PMI report is set, a single wideband indication i1 can be reported for the entire CSI reporting band, or one or more subband indications i2 (e.g., subband indications for each subband) for each subband within the entire CSI report can be reported.

[0050] The UE uses the received RS to perform channel estimation and estimates the channel matrix H. The UE feeds back an index (PMI) determined based on the estimated channel matrix.

[0051] The PMI can also indicate a precoder matrix (which can also be abbreviated as a precoder) that the UE believes is suitable for downlink (downlink (DL)) transmission to the UE. Each value of the PMI can also correspond to a precoder matrix. The set of values of the PMI can also correspond to a set of different precoder matrices called a precoder codebook (which can also be abbreviated as a codebook).

[0052] In the space domain, the CSI report can also include more than one type of CSI. For example, the CSI can include at least one of a first type (Type 1 CSI) used in the selection of a single beam and a second type (Type 2 CSI) used in the selection of multiple beams. A single beam can also be renamed as a single layer, and multiple beams can also be renamed as multiple beams. In addition, Type 1 CSI may not assume multi-user multiple input multiple output (multiple input multiple output (MU-MIMO)), and Type 2 CSI may assume multi-user MIMO.

[0053] The above codebook may also include a codebook for type 1 CSI (also referred to as type 1 codebook, etc.) and a codebook for type 2 CSI (also referred to as type 2 codebook, etc.). In addition, type 1 CSI may also include type 1 single-panel CSI and type 1 multi-panel CSI, and different codebooks (type 1 single-panel codebook, type 1 multi-panel codebook) may also be specified respectively.

[0054] In this disclosure, type 1 and type I may also be rewritten with each other. In this disclosure, type 2 and type II may also be rewritten with each other.

[0055] 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 may be carried by either PUCCH or PUSCH.

[0056] In Rel.15 NR, UCI can include one CSI part for wideband PMI feedback. When CSI report #n is reported, it includes wideband PMI information.

[0057] In Rel.15 NR, UCI can include two CSI parts for subband PMI feedback. CSI part 1 includes wideband PMI information. CSI part 2 includes one wideband PMI information and several subband PMI information. CSI part 1 and CSI part 2 are encoded separately.

[0058] In Rel.15 NR, the UE is configured by higher layers with N (N≥1) reporting configurations set for CSI reports and M (M≥1) resource configurations set for CSI resources. For example, a CSI report configuration (CSI-ReportConfig) includes resource configurations for channel measurement (resourcesForChannelMeasurement), CSI-IM resources for interference (csi-IM-ResourceForInterference), NZP-CSI-RS resources for interference (nzp-CSI-RS-ResourceForInterference), report quantity (reportQuantity), etc. The resource configurations for channel measurement, CSI-IM resources for interference, and NZP-CSI-RS resources for interference are respectively associated with CSI resource configurations (CSI-ResourceConfig, CSI-ResourceConfigId). The CSI resource configuration includes a list of CSI-RS resource sets (csi-RS-ResourceSetList, e.g., NZP-CSI-RS resource set or CSI-IM resource set).

[0059] In order to enable more dynamic channel / interference assumptions for NCJT for both FR1 and FR2, the evaluation and specification of CSI reports for transmission of at least one of DL multi-TRP and multi-panel are being studied.

[0060] (Codebook configuration)

[0061] The UE is configured with parameters related to the codebook (CodebookConfig) by higher layer signaling (RRC signaling). The codebook configuration is included in the CSI report configuration (CSI-ReportConfig) of higher layer (RRC) parameters.

[0062] In the codebook configuration, at least one codebook is selected from multiple codebooks including type I single panel (typeI-SinglePanel), type I multi-panel (typeI-MultiPanel), type II (typeII), and type II port selection (typeII-PortSelection).

[0063] The parameters of the codebook include parameters related to codebook subset restriction (CBSR) (Restriction (...Restriction)). The setting of CBSR is a bit indicating which PMI report ("1") is allowed or which PMI report ("0") is not allowed for the precoder associated with the bits of CBSR. One bit of the CBSR bitmap corresponds to one codebook index / antenna port.

[0064] (CSI report setting)

[0065] The CSI report setting (CSI-ReportConfig) in Rel.16 includes, in addition to the codebook setting (CodebookConfig), CSI-RS resources for channel measurement (resourcesForChannelMeasurement (CMR)), CSI-RS resources for interference measurement (csi-IM-ResourcesForInterference (ZP-IMR), nzp-CSI-RS-ResourcesForInterference (NZP-IMR)), etc. The parameters in CSI-ReportConfig other than codebookConfig-r16 are also included in the CSI report setting in Rel.15.

[0066] In Rel.17, an enhanced (extended) CSI report setting (CSI-ReportConfig) for CSI measurement / reporting using NCJT for multiple TRPs is being studied. In this CSI report setting, two CMR groups corresponding to each of the two TRPs are set. The CMRs within the CMR group can also be used for measurements of at least one of the multiple TRPs and single TRP using NCJT. N CMR pairs of NCJT are set by RRC signaling. The UE can also be set by RRC signaling whether to use the CMR of the CMR pair for single TRP measurement.

[0067] Regarding the CSI report associated with the NCJT measurement of multiple TRPs / panels set through a single CSI report setting, at least one of the following options 1 and 2 is being studied.

[0068] <Option 1>

[0069] The UE is configured to report X (X = 0, 1, 2) CSIs associated with single-TRP measurement hypotheses and one CSI associated with NCJT measurement. In the case of X = 2, the two CSIs are associated with two different single-TRP measurements of CMR using different CMR groups.

[0070] <Option 2>

[0071] The UE can also be configured to report one CSI associated with the best measurement result among the measurement hypotheses for NCJT and single-TRP.

[0072] As described above, in Rel.15 / 16, the CBSR is configured according to each codebook setting for each CSI report setting. That is, the CBSR is applied to all CMRs etc. within the corresponding CSI report setting.

[0073] However, in the CSI report setting for multi-TRP in Rel.17 based on the CSI report setting, when the above Option 1 or 2 is applied, it is possible to configure measurements as follows.

[0074] Option 1 (X = 0): Measurement of only the CSI of NCJT.

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

[0076] Option 1 (X = 2): Measurement of the CSI of NCJT and the CSI of a single TRP (two TRPs).

[0077] Option 2: Measurement of both the CSI of NCJT and the CSI of a single TRP.

[0078] (Type 1 codebook)

[0079] As the Type 1 codebook (Rel.15), for the base station panel, a Type 1 single-panel codebook and a Type 1 multi-panel codebook are defined. In the Type 1 single panel, for (N1, N2), an antenna model of the CSI antenna port array (logical setting) is defined. The number of CSI-RS antenna ports P CSI-RS is 2N1N2. In the Type 1 multi-panel, for the number of CSI-RS antenna ports P CSI-RS and (N g , N1, N2), an antenna model of the CSI antenna port array (logical setting) is defined.

[0080] For Rel.15 type 1 single-panel CSI, the UE sets the high-layer parameter of the codebook type (subType within type1 within codebookType within CodebookConfig) to type 1 single-panel ('typeI-SinglePanel'). If the number of layers v ∉ {2, 3, 4}, the PMI value corresponds to 3 codebook indices i 1,1 , i 1,2 , i2. If the number of layers v ∈ {2, 3, 4}, the PMI value corresponds to 4 codebook indices i 1,1 , i 1,2 , i 1,3 , i2. If the number of layers v ∉ {2, 3, 4}, the composite codebook index i1 = [i 1,1 i 1,2 . If 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 broadband. i2 = n can also be an index for subband / phase.

[0081] For P CSI-RS , the supported settings (combinations of values) of (N1, N2) and (O1, O2) are specified in the specification. (N1, N2) represents the number of antenna elements in two dimensions (2D) and is set by the high-layer parameter n1 - n2 within nrOfAntennaPorts within moreThanTwo within typeI-SinglePanel. n1 - n2 is a bitmap parameter of N1O1N2O2 bits. (O1, O2) is the 2D oversampling factor.

[0082] In the codebook corresponding to the 1-layer CSI report and codebookMode = 1, the index i 1,1 = l = 0, 1,..., N1O1 - 1 corresponding to the beam in the horizontal direction, the index i 1,2 = m = 0, 1,..., N2O2 - 1 corresponding to the beam in the vertical direction, i2 = n =, 0, 1, 2, 3, and the matrix for the 1-layer CSI report codebook using antenna ports 3000 to 2999 + P CSI-RS is W_i 1,1 , i 1,2 , i2^(1). Here, W l,m,n (1) is given by the following formula.

[0083]

[0084] Here, v l,m is a 2D-SD-DFT basis of N1 rows and N2 columns (exp(j2πln1 / O1N1)×exp(j2πmn2 / O2N2), n1 = 0, 1, ..., N1-1, n2 = 0, 1, ..., N2-1). Co-phasing between polarization waves (polarization wave, polarization wave, polarized wave) (horizontal polarization wave and vertical polarization wave) represents the phase of another polarization wave with respect to the phase of one polarization wave.

[0085] Compared with the type 1 single panel, for the Rel.15 type 1 multi-panel CSI, in addition to N1 and N2 being set, the number of panels N is also set g . As inter-panel phase matching (inter-panel co-phasing, inter-panel phase compensation, phase compensation between panels), the additional report is i 1,4 . For each panel, the same SD beam (precoding matrix W l ) is selected, and only the inter-panel phase matching is additionally reported.

[0086] For P CSI-RS , the supported settings (combinations of values) of (N g , N1, N2) and (O1, O2) are specified in the specification. (N1, N2) is set by the ng-n1-n2 setting within typeI-MultiPanel. i 1,1 is {0, 1, ..., N1O1-1}. i 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 the codebookMode = 1, the matrix for the 1-layer CSI reporting codebook using antenna ports 3000 to 2999+P CSI-RS 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.

[0087] For N g = {2, 4} of 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 ; for the second layer, \(N\) g = 2, \(codeBookMode\) = 1 matrix \(W\) l,m,p,n 2,2,1 ; for the first layer, \(N\) g = 4, \(codeBookMode\) = 1 matrix \(W\) l,m,p,n 1,4,1 ; for the second layer, \(N\) g = 4, \(codeBookMode\) = 1 matrix \(W\) l,m,p,n 2,4,1 ) is given by the following formula.

[0088]

[0089] Here,[[]]END]] For \(N\) g = 2, \(p = p1\), for \(N\) g = 4, \(p = [p1, p2, p3]\). Indicates inter-panel phase matching. For panels 0, 1, 2, 3, the same beam (SD beam matrix, precoding matrix \(W\) l ) is selected. Indicates the phase compensation of panel 1 relative to panel 0. Indicates the phase compensation of panel 2 relative to panel 0. Indicates the phase compensation of panel 3 relative to panel 0.

[0090] (Type 2 codebook)

[0091] In the present disclosure, a matrix \(Z\) of \(X\) rows and \(Y\) columns is sometimes denoted as \(Z(X×Y)\).

[0092] Regarding the type 2 CSI of Rel.15, for a given layer \(l\), the generation of the precoding vector for each subband (SB - wise) is based on the following formula.

[0093] \(W\) l (\(N\) t × \(N3\)) = \(W1W\) 2,l (\(X3\))

[0094] \(N\) t is the number of antennas / antenna ports. \(N3\) is the total number (number of subbands) of the precoding (beamforming) matrix (precoder) indicated by the PMI. \(W1(N\) t(×2L) is a matrix (SD beam matrix) composed of L ∈ {2, 4} (oversampled) spatial domain (SD) 2D DFT vectors (SD beams, 2D-DFT vectors). L is the number of beams. Considering the actual number of beams for horizontally polarized waves and vertically polarized waves at a position is 2L. For example, the two SD 2D-DFT vectors for L = 2 are b i , b j . W 2,l (2L×N3) is a matrix (LC coefficient matrix) composed of linear combination coefficients (linear combination (LC) coefficients, subband complex LC coefficients, combination coefficients) for layer l. W 2,l represents beam selection and phase matching (co-phasing) between two polarization waves. For example, the two W 2,l are respectively c i , c j . For example, the channel vector h is approximated by the linear combination c i b i , + c j b j of two SD 2D-DFT vectors with L = 2. The feedback overhead is mainly caused by the LC coefficient matrix W 2,l . In addition, Rel.15 type 2 CSI only supports rank 1 and 2.

[0095] In type 2 CSI, the channel (channel matrix) for a certain user is represented by the linear combination of two polarization waves and L beams (L 2D-DFT vectors). Rel.15 type 2 CSI supports rank 1 and 2.

[0096] (Expansion of type 2 codebook)

[0097] Rel.16 type 2 CSI (enhanced type 2 codebook) reduces the overhead associated with W 2,l through frequency domain (FD) compression. Rel.16 type 2 CSI supports rank 3 and 4 in addition to rank 1 and 2.

[0098] In Rel.16 type 2 CSI, for a given layer l, the UE reports information based on the following formula.

[0099] W l = W1W ～ l W f,l H (X4)

[0100] W 2,l Via W ～ l W f,l H and approximate. Matrix W ～ can also be represented by appending ~(w tilde) above W. W ～ l can also be expressed as W ～ 2,l . Matrix W f,l H is the adjoint matrix of W, obtained by the conjugate transpose of W f,l . f,l For the CSI report, the UE can also be set to one sub-band size within two sub-band sizes. This sub-band (CQI sub-band) can also be defined as N

[0101] consecutive PRBs and depends on the total number of PRBs within the BWP. The number of PMI sub-bands R in each CQI sub-band is set by the RRC IE (numberOfPMI-SubbandsPerCQI-Subband). R controls the total number N3 of precoding matrices represented by the PMI and is a function of the number of sub-bands set within the csi-ReportingBand, the sub-band size set by subbandSize, and the total number of PRBs within the BWP. PRB SB

[0102] W1(N t ×2L) is a matrix composed of multiple (oversampled) spatial domain (SD) 2D-DFT (vectors, beams). For this matrix, multiple indices of the two-dimensional discrete Fourier transform (2D-DFT) vectors and the two-dimensional oversampling factor are reported. The response / distribution of the spatial domain represented by the SD 2D-DFT vectors can also be called the SD beam.

[0103] W ～ l (2L×M v ) is a matrix composed of LC coefficients. For this matrix, at most K0 non-zero coefficients (non-zero coefficients (NZCs), LC coefficients with non-zero amplitudes) are reported. This report consists of two parts: a bitmap capturing the NZC positions and quantifying the NZCs.

[0104] W f,l (N3×M v ​) is a matrix composed of multiple frequency domain (FD) bases (vectors) for layer l. For N3, as a function of the number of subbands set within csi-ReportingBand, it is the total number (number of subbands) of the precoding (beamforming) matrix (precoder) represented by PMI. csi-ReportingBand represents the continuous or discontinuous subbands within the BWP when CSI for a certain BWP is reported. There are M v FD bases (FD DFT bases) for each layer. When N3 > 19, M v DFTs are selected from an intermediate subset (InS) of size N3' (< N3). When N3 ≤ 19, log2(C(N3 - 1, M v - 1)) bits are reported. 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 known as binomial coefficients.

[0105] The frequency domain response / distribution (frequency response) represented by the linear combination of FD basis vectors and LC coefficients can also be called an FD beam. The FD beam can also correspond to a delay profile (time response).

[0106] A subset of FD bases is given as {f1,..., f M_v}. Here, f i is the i-th FD basis for the l-th (l = 1,..., v) layer, and i ∈ {1,..., M v}. The PMI subband size is given by CQI subband size / R, where R ∈ {1, 2}. The number M v of FD bases for a 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.

[0107] Matrix W 2,lEach row represents the channel frequency response of a specific SD beam. When the SD beam has high directivity, the channel taps of each beam are defined (the power delay profile becomes sparse in the time domain). As a result, the channel frequency responses of each SD beam have high correlation (close to flat in the frequency domain). In this case, the channel frequency response can be approximated by a linear combination of a smaller number of FD bases. For example, when M v = 2, using FD bases f2, f q and LC coefficients d1 0 , d2 0 , the frequency response associated with SD beam b0 is approximated by d1 0 f2 +, d2 0 f q .

[0108] Select M v FD bases to obtain the highest gain. By setting M v << N3, the overhead of W ～ l is much smaller than the overhead of W 2,l . All or part of the M v FD bases are used for the approximation of the frequency responses of each SD beam. A bitmap is used to report only the FD bases selected for each SD beam. If the bitmap is not reported, all FD bases are selected for each SD beam. In this case, for each SD beam, the NZC of all FD bases is reported. The number of NZCs K l NZ ≤ K0 = ceil(β × 2LM v ), and the number of NZCs K NZ ≤ 2K0 = ceil(β × 2LM v ) across all layers. β is set by the higher layer.

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

[0110] The type 2 CSI feedback on the Rel.16 PUSCH contains two parts. CSI part 1 has a fixed payload size and is used to identify the number of information bits within CSI part 2. The size of part 2 is variable (the UCI size depends on the number of NZCs, which is not known to the base station). The UE reports the number of NZCs within 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 contains an indication of RI, CQI, and the total number of non-zero amplitudes (NZCs) across multiple layers for enhanced type 2 CSI. The fields of part 1 are encoded separately. CSI part 2 contains the PMI for enhanced type 2 CSI. Part 1 and part 2 are encoded separately. CSI part 2 (PMI) contains an oversampling factor, an index of the 2D-DFT basis, an index M of the initial DFT basis (starting offset) of the selected DFT window initial , at least one of the DFT basis selected per layer, the NZCs (amplitude and phase) per layer, the strongest (maximum intensity, strongest amplitude) coefficient indicator (SCI) per layer, and the amplitude of the strongest coefficient per layer / per polarization wave.

[0112] Alternatively, multiple PMI indices (PMI values, codebook indices) associated with different CSI part 2 information follow the following for layer l.

[0113] ·i 1,1 : Oversampling factor [q1q2]. q1 ∈ {0, 1,..., O1 - 1}, q2 ∈ {0, 1,..., O2 - 1}.

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

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

[0116] ·i 1,6,l : Codebook indicator. The selected (FD) DFT basis for layer l. 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 within this bitmap are used to identify the report i2,4,l and i 2,5,l which coefficient within i 1,7,l = [k l,0 (3) ...k l,Mv-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 : The strongest coefficient indicator for the l-th layer (the maximum element k within the amplitude coefficient indicator l,i,f (2) ).

[0119] ·i 2,3,l : The amplitude coefficient indicator of the coefficient (wideband) of the (polarization waves of both) for the l-th layer. i 2,3,l = [k l,0 (1) k l,1 (1) .

[0120] ·i 2,4,l : The amplitude coefficient indicator of the reported coefficient (sub-band) for the l-th layer. i 2,3,l = [k l,0 (2) ...k l,Mv-1 (2) .

[0121] ·i 2,5,l : The phase coefficient indicator of the reported coefficient (sub-band) for the l-th layer. i 2,5,l = [c l,0, f ...c l,Mv-1,f .

[0122] Let f l * ∈ {0, 1,..., M v -1} be the index of i 2,4,l , and let i l * ∈ {0, 1,..., 2L - 1} be the index of k l,f_l^* (2) . This is used to identify the strongest coefficient for layers l = 1,..., v, i.e., the element k of i for layer l 2,4,l of l,i_l^*,f_l^* (2) . Codebook index n3,l Regarding n 3,l (f_l^*) is remapped to n 3,l (f) =(n 3,l (f) -n 3,l (f_l^*) ) mod N3, and becomes n after remapping 3,l (f_l^*) =0. Index f regarding f l * is remapped to f=(f - f l * ) mod M v , and becomes f after remapping l * =0 (l = 1,..., v). i 2,4,l 、i 2,5,l 、and i 1,7,l respectively represent the remapped amplitude coefficient, phase coefficient, and bitmap. The strongest coefficient of layer l identified by i 1,8,l ∈{0, 1,..., 2L - 1} is given as i 1,8,l =Σ i＝0 i_1^* k l,i,0 (3) -1 for 1 < v ≤ 4, and is given as i 1,8,l =i l * .

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

[0124] [Amplitude Quantization]

[0125] The polarization wave specific reference amplitude is 16 - level quantization using the Figure 1 table (mapping of elements within the amplitude coefficient indicator i 2,3,l : mapping from the amplitude coefficient indicator element k l,p (1) to the amplitude coefficient p l,p (1) ). Through this table, p l (1) =[p l,0 (1) p l,1 (1) is quantized to [k l,0 (1) k l,1 (1) , kl,p (1) ∈ {0, ..., 15}. All other coefficients are used Figure 2 in the table (amplitude coefficient indicator i 2,4,l mapping of the elements within: from the amplitude coefficient indicator element k l,i,f (2) to the amplitude coefficient p l,i,f (2) mapping). 8-level quantization. Through this table, p l (2) = [p l,0 (2) ... p l,Mv-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] The elements (amplitude coefficient indicator elements) within the amplitude coefficient indicator i 2,5,l [c l,0 ... c l,Mv-1 are reported by the UE (using 4 bits). All phase coefficients are quantized using 16-PSK. The quantity for phase matching in which the phase coefficients are quantized to c l,f = [c l,0,f ... c l,2L-1.f , c l,i,fi ∈ {0, ..., 15}.

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

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

[0130] Use the matrix W for CSI reporting of v (= 1 to 4) layers from 3000 to 2999 + P CSI-RS based on the following matrix W for layer l (= 1 to v) (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) represents the strongest coefficient, y t,l (f) represents the FD - DFT basis (exp(j2πtn 3,l (f) / N3), port index t = 0, 1,..., N3 - 1, l = 1,..., v), p l,i,f (2) represents the amplitude coefficient, represents the phase coefficient. Thus, the codebook for each layer includes the strongest coefficient for each polarization wave, the amplitude coefficient for each polarization wave for each FD - DFT basis and each SD - DFT basis, and the phase coefficient for each polarization wave for each FD - DFT basis and each SD - DFT basis.

[0133] As the grouping of CSI part 2, for a given CSI report, the PMI information is aggregated into 3 groups (from group 0 to 2). This is important in the case of CSI omission. Index i 2,4,l 、i 2,5,l 、i 1,7,l The reported elements of are associated with specific priority rules. From group 0 to 2, follow the following.

[0134] · Group 0: Index i1,1 , i 1,2 , i 1,8,l (l = 1, ..., v).

[0135] · Group 1: Index i (in the case of being reported) 1,5 , Index i (in the case of being reported) 1,6,l , i 1,7,l The highest (higher-order) v2LM within i v - floor(K NZ / 2) priority elements, i 2,3,l , i 2,4,l The highest (higher-order) ceil(K NZ / 2) - v priority elements within i 2,5,l The highest (higher-order) ceil(K NZ / 2) - v priority elements (l = 1, ..., v).

[0136] · Group 2: i 1,7,l The lowest (lower-order) floor(K NZ / 2) priority elements within i 2,4,l The lowest (lower-order) floor(K NZ / 2) priority elements within i 2,5,l The lowest (lower-order) floor(K NZ / 2) priority elements (l = 1, ..., v).

[0137] In type 1 CSI, the SD beam represented by the SD DFT vector is sent to the UE. In type 2 CSI, L SD beams are linearly combined and sent to the UE. Each SD beam can be associated with multiple FD beams. For the corresponding SD beam, the channel frequency response can be obtained through the linear combination of these FD basis vectors. The channel frequency response corresponds to the power delay profile.

[0138] (Type 2 port selection codebook / enhanced / further enhanced)

[0139] In the type 2 port selection (PS) CSI (type 2 PS codebook) of Rel.15, the UE does not need to derive the SD beam by considering 2D-DFT as in type 2 CSI. The base station uses K CSI-RS ports beamformed considering the set of SD beams to send CSI-RS. The UE selects / identifies the best L (≤K) CSI-RS ports for each polarization wave and reports their indices within W1. The type 2 PS CSI of Rel.15 supports rank 1, 2.

[0140] The operation of Type 2 PS CSI (Enhanced Type 2 PS Codebook) in Rel. 16 is the same as that of Type 2 CSI in Rel. 16 except for the selection of SD beams. Type 2 PS CSI in Rel. 15 supports ranks 1 to 4.

[0141] For layer l ∈ {1, 2, 3, 4}, the precoder for each subband (SB - wise) is generated as given by the following formula.

[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 for CSI - RS beamforming. W1(K × 2L) is a block diagonal matrix. W ～ l (2L × M) is an LC coefficient matrix. W f,l (N3 × M) is composed of N3 FD - DFT basis vectors (FD basis vectors). K is set by the higher layer. L is set by the higher layer. P CSI-RS ∈ {4, 8, 12, 16, 24, 32}. When P CSI-RS > 4, L ∈ {2, 3, 4}.

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

[0145] Similar to Type 2 CSI in Rel. 16, Type 2 PS CSI in Rel. 16 reduces the overhead compared to Type 2 PS CSI in Rel. 15 by reducing the number of FD bases from N3 to M v (M v << N3).

[0146] In Type 2 port - selected CSI / codebook (Further Enhanced (Continuously Enhanced, Further Enhanced) Type 2 port - selected codebook) in Rel. 17, for each CSI - RS port #i, instead of an SD beam, it is associated with a pair of SD - FD beams (a pair of an SD beam b i and an FD beam f i,j where j is the frequency index).Figure 4A and Figure 4B )。In this example, ports 3 and 4 are associated with the same SD beam and different FD beams.

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

[0148] The main scenario of the Rel.17 type 2 port selection codebook is FDD. The channel reciprocity based on SRS measurement is imperfect (the angles of the UL beam and the DL beam may be different, the UL frequency and the DL frequency are different in FDD, and the effective antenna spacing in its UL frequency and DL frequency is different). However, the base station can obtain / select some partial information (dominant angles and delays (SD beam and FD beam)). In addition to CSI reporting, SRS measurement in the base station is also used so that the base station can obtain the CSI for the decision of the DL MIMO precoder. In this case, in order to reduce the CSI overhead, some CSI reports can also be omitted.

[0149] In the Rel.17 (further enhanced) type 2 port selection codebook, the values of α, M, β (parameter combination) are determined by the higher - layer parameter paramCombination - r17 (codebook parameter setting). The precoding matrix represented by PMI is determined according to L + M vectors. Here, L = K1 / 2 and K1 = αP CSI- RS.

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

[0151] It can also be that for a given layer l, the UE reports the 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 reports them as part of the PMI(W 1,l ) to the base station. In Rel.16, each port is associated with an SD beam.

[0154] W ～ l (2L×M v ) is a matrix composed of combination coefficients (sub-band complex LC coefficients). At most K0 NZCs are reported. The report consists of two parts: a bitmap capturing the NZC positions and the quantized NZCs. The bitmap can be omitted in certain cases. Additionally, in Rel.16, the bitmap of NZC positions is always reported.

[0155] W f,l (N3×M v ) is a matrix composed of N3 FD basis (FD-DFT basis) vectors. Each layer has M v FD bases. The base station can also cancel W f,l . When W f,l is on, M v additional FD bases are reported. When W f,l is off, the additional FD bases are not reported. Additionally, in Rel.16, W f,l is always reported.

[0156] (JT)

[0157] Joint transmission (JT) can also mean simultaneous data transmission from multiple points (e.g., TRPs) to a single UE.

[0158] Rel.17 supports non-coherent joint transmission (NCJT) from two TRPs. The PDSCHs from two TRPs can be precoded independently and decoded independently. The frequency resources can be non-overlapping, partially overlapping, or fully overlapping. In the case of overlap, the PDSCH from one TRP becomes interference to the PDSCH from the other TRP.

[0159] In Rel.18, research is underway to support coherent joint transmission (CJT) using up to 4 TRPs. Data from 4 TRPs can also be precoded coherently and transmitted to the UE on the same time-frequency resources. For example, channels from 4 TRPs can also be considered, using the same precoding matrix. Coherence can also mean having a certain relationship between the phases of multiple received signals. 4 TRP joint precoding can also be used to improve signal quality, and there can be no interference between the 4 TRPs. The data can also be affected only by interference outside the 4 TRPs.

[0160] (Rel.17 NCJT CSI)

[0161] In Rel.17, the scenarios where NCJT CSI reporting can be applied are single DCI-based MTRP NCJT accompanied by type 1 single-panel codebooks. For NCJT CSI measurement, within a single CSI-ReportConfig, 2 CMR groups can be configured to accompany channel measurement resources (CMRs) from one TRP each. One CSI reporting mode can be configured from two modes.

[0162] Through RRC signaling, the CSI-ReportConfig for Rel.17 non-coherent joint transmission (NCJT) CSI configures the CMRs and the CSI reporting mode (csi-ReportMode).

[0163] Accompanied by K s = K1 + K2 CMRs, two CMR groups are configured for the UE. 2 ≤ K s ≤ 8. K s CMRs correspond to NZP-CSI-RS resource sets for channel measurement. K1 and K2 are the numbers of CMRs within the two CMR groups respectively. By selecting from all possible pairs, N (N groups) CMR pairs are configured by the higher layer. Support for N = 1, K s = 2. Support for N max = 2 is an optional function for the UE. Support for K S,max = X is an optional function for the UE. Each CMR can include up to 32 CSI-RS ports according to the UE's capabilities. Each CMR pair is associated with a CRI value.

[0164] The bitmap based on RRC signaling represents N (N = 1, 2) CMR pairs actually used for NCJT measurement by representing one CMR from each CMR group. The UE uses the CMRs within two CMR groups to measure the single-TRP CSI for TRP1 and the single-TRP CSI for TRP2, and uses N CMR pairs to measure the NCJT CSI.

[0165] The UE selects one or more CSIs to report based on the mode set by csi-ReportMode. csi-ReportMode represents one of the following two modes: Mode 1 and Mode 2.

[0166] At least one of the following Mode 1 and Mode 2 is supported.

[0167] [Mode 1]

[0168] The UE can also be set to report X CSIs associated with the single-TRP measurement hypothesis and one CSI associated with the NCJT measurement hypothesis. X = 0, 1, 2. In the case of X = 2, the two CSIs are associated with two different single-TRP measurement hypotheses accompanying multiple CMRs from different multiple CMR groups. The support for X = 1, 2 is an optional function of the UE for UEs that support Option 1.

[0169] [Mode 2]

[0170] The UE is set to report one CSI associated with the best one within the measurement hypotheses of NCJT and single-TRP.

[0171] In Mode 1, the UE reports X + 1 CSIs in total as the X + 1 CSIs include X (X = 0, 1, 2) single-TRP CSIs and one NCJT CSI. In Mode 2, the UE reports one best CSI (one CSI) from all the single-TRP CSIs and one NCJT CSI.

[0172] Within one CSI report, at most two single-TRP CSIs and one NCJT CSI can be reported (accompanying Mode 1 with X = 2). The NCJT CSI includes one CRI, two RIs (accompanying one joint RI index), two PMIs, two LIs, and one CQI (below 4 layers). The single-TRP CSI is the same as the existing CSI, including one CRI, one RI / PMI / LI, and one or two CQIs (below 8 layers, one CQI per CW).

[0173] For the following several cases, a new mapping order (table) of multiple fields within one CSI report is defined.

[0174] · Mapping order of wideband CSI for mode 1 with X = 0. Wideband CSI is supported only for mode 1 with X = 0, i.e., NCJT CSI.

[0175] · Mapping order of CSI part 1 for modes 1 and 2.

[0176] · Mapping order of wideband CSI part 2 for modes 1 and 2.

[0177] · Mapping order of subband CSI part 2 for modes 1 and 2.

[0178] (CJT)

[0179] In Rel.18, the study is ongoing on supporting coherent joint transmission (CJT) with up to 4 TRPs. Data from 4 TRPs can also be precoded coherently and transmitted to the UE on the same time-frequency resource. For example, the channels from 4 TRPs can also be considered, using the same precoding matrix. Coherence can also mean having a certain relationship between the phases of multiple received signals. 4-TRP joint precoding can also be used to improve the signal quality, and there can also be no interference between the 4 TRPs. The data can also be interfered with only by sources other than the 4 TRPs.

[0180] In the ideal case where the 4 TRPs are co-located (considered to be in the same location), joint estimation of the aggregated channel matrix H can be performed, and the joint precoding matrix V can be fed back. However, the large scale pathloss of the 4 paths is sometimes significantly different. The joint precoding matrix V based on the constant module codebook is not accurate. In this case, the feedback of each TRP and the coefficients between TRPs (inter-TRP) can be matched by the current NR type 2 codebook.

[0181] For CJT with up to 4 TRPs in FR1, the selection of the 4 TRPs can also be semi-static. Therefore, this selection and the setting of the 4 CMRs (4 CSI-RS resources) for channel measurement can also be semi-static. Dynamic indication of the 4 TRPs from the list of CSI-RS resources is also possible, but the probability is low.

[0182] The pathlosses from the 4 TRPs to the UE are different. Therefore, it is difficult to report only one aggregated CSI representing the joint channel matrix.

[0183] Consider a fallback operation to NCJT (i.e., single TRP), and also consider the CSI for each TRP (i.e., single TRP CSI like Rel. 17 NCJT CSI).

[0184] (CJT CSI)

[0185] Assume ideal backhaul, synchronization, and the same number of antenna ports across multiple TRPs. CSI acquisition for coherent joint transmission (CJT) for FR1 and up to 4 TRPs is being studied. For FDD-oriented CJT multi-TRP, an improvement of the Rel. 16 / 17 type 2 codebook is being studied.

[0186] As CSI enhancements for CJT, the following are being studied.

[0187] · CMR and IMR for measurements for up to 4 TRPs.

[0188] · CSI for each TRP accompanied by inter-TRP CSI feedback for x-TRP CJT.

[0189] · Inter-TRP CSI: New feedback and codebooks for inter-TRP phase matrix / inter-TRP amplitude matrix / inter-TRP matrix (including both amplitude and phase).

[0190] · Additional reportable x-TRP CJT CQI.

[0191] As multi-TRP CJT CSI, the following are being studied.

[0192] · Settings limitations for CMR / CSI for each TRP.

[0193] · Inter-TRP CSI / PMI (e.g., inter-TRP phase with / without inter-TRP amplitude).

[0194] [Option 1] Independent codebooks and feedback in addition to the Rel. 16 / 17 type 2 codebook.

[0195] [Option 2] Accompanied by W l ～ W f,l H / In W l ～ W f,l HW2 of CSI / PMI between TRPs transmitted within. Common / different FD bases for multiple TRPs.

[0196] As multi-panel type 2 CSI for multi-TRP CJT, the following is being studied.

[0197] · Enhancement of type 2 codebook and type 2 PS codebook of Rel.16 / 17 to multi-panel.

[0198] · New antenna settings for type 2 multi-panel codebook.

[0199] W1 (SD base) / W for each TRP f (FD base) can be the same or different. W for each TRP l (NZC) can also be different. W1 / W for each TRP f / W l can be selected jointly or separately. For W1 / W f / W l For the design of, it is preferably different scenarios with different options. can be reported as separate content or within W l These used guidelines relate to configuration scenarios (e.g., intra-site multi-TRP or inter-site multi-TRP).

[0200] For example, the precoding matrix for 4-TRP CJT CSI (codebook) can also be represented by W1 / W f / W l for each TRP. W1 for each TRP can be the same or different, and can be selected jointly or separately. W for each TRP l can also be different, and can be selected jointly or separately. W for each TRP f can be the same or different, and can be selected jointly or separately.

[0201] In the (Rel.18) type 2 codebook (codebook structure) for CJT multi-TRP (mTRP), at least one of the following several modes (codebook modes) can also be supported.

[0202] [Mode 1]

[0203] SD / FD base selection for each TRP / each TRP group. This allows independent FD base selection across N TRPs / TRP groups. For example, its codebook structure is given by the following formula. Here, N is the number of TRPs or TRP groups.

[0204]

[0205] [Mode 2]

[0206] SD basis selection for each TRP / each TRP group (port group or resource), and joint / common FD basis selection (across N TRPs / TRP groups). For example, its codebook structure is given by the following formula. Here, N is the number of TRPs or TRP groups.

[0207]

[0208] In these two modes, detailed designs such as parameter combinations, basis selection, TRP(group) selection, reference amplitude, and W2 quantization method can also be made common.

[0209] In the improvement of the type 2 codebook, it is being studied that the selection of N CSI-RS resources is performed by the UE and reported as part of the CSI report. Here, N ∈ {1,..., N TRP}. N is the number of cooperative CSI-RS resources. N TRP is the maximum number of cooperative CSI-RS resources, which is set by the base station via higher layer signaling. It is being studied that N TRP selections from N CSI-RS resources are reported via an N TRP bit bitmap within CSI part 1. For example, it can also be that when 4 TRPs are set and the UE selects the 1st and 3rd TRPs, the UE reports the bitmap

[1010] indicating this selection. The setting of the limit of N = N TRP can also be supported and set by the base station via higher layer signaling. For example, when 4 TRPs are set, the UE can also report the CJT CSI assuming a 4-TRP CJT. When this limit is set, the N TRP bit bitmap may not be reported.

[0210] Regarding the L parameter related to SD basis selection in the improvement of the type 2 codebook for CJT mTRP, it is being studied to use at least one of the following several options.

[0211] [Selection method 1]{L n ,n = 1,..., N} is set by the base station via higher layer (RRC) signaling.

[0212] [Selection method 2]L tot = Σ n＝1 N L n is set by the base station via higher layer (RRC) signaling. {Ln , n = 1, ..., N} are reported by the UE in relative values.

[0213] [Selection method 3] The L parameter is set by the base station via higher layer (RRC) signaling. {L n , n = 1, ..., N} are determined according to the value of L.

[0214] [Selection method 4] L max is set by the base station via higher layer (RRC) signaling. {L n , n = 1, ..., N} are reported by the UE in relative values so that Σ n＝1 N L n . < L max .

[0215] When the number of SD bases selected per TRP is determined and reported by the UE, it is not clear how to determine the size (number of bits) of the report of this number, how the base station and the UE have a common understanding of the size (number of bits) of the report of the number / index of the reported SD bases per TRP, etc. If such operations are not clear, there is a concern that it may lead to a decrease in throughput / communication quality, etc.

[0216] Therefore, the inventors of the present invention have come up with a method for determining the CPU usage / processing volume consumed by CSI reporting.

[0217] Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the drawings. In addition, the following embodiments (for example, each case) can be used separately or at least two of them can be combined and applied.

[0218] In the present disclosure, "A / B" and "at least one of A and B" can also be rewritten with each other. In addition, in the present disclosure, "A / B / C" can also mean "at least one of A, B, and C".

[0219] In the present disclosure, activate, deactivate, indicate (or specify (show (indicate))), select, configure, update, determine, etc. can also be rewritten with each other. In the present disclosure, support, control, be able to control, operate, be able to operate, etc. can also be rewritten with each other.

[0220] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, Information Elements (IEs), settings, etc. can also be rewritten with each other. In the present disclosure, Medium Access Control control elements (MAC Control Elements (MAC CEs)), update commands, activate / deactivate commands, etc. can also be rewritten with each other.

[0221] In the present disclosure, higher layer signaling can also be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0222] In the present disclosure, MAC signaling can also use, for example, MAC Control Elements (MAC CEs), MAC Protocol Data Units (MAC PDUs), etc. Broadcast information can also be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0223] In the present disclosure, physical layer signaling can also be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), etc.

[0224] In the present disclosure, indexes, identifiers (Identifiers (IDs)), indicators, resource IDs, etc. can also be rewritten with each other. In the present disclosure, sequences, lists, sets, groups, clusters, subsets, etc. can also be rewritten with each other.

[0225] In the present disclosure, a panel, a panel group, a beam, a beam group, a precoder, an uplink (UL) transmission entity, a transmission / reception point (TRP), a base station, spatial relation information (SRI), a spatial relation, an SRS resource indicator (SRI), a control resource set (CORESET), a physical downlink shared channel (PDSCH), a codeword (CW), a transport block (TB), a reference signal (RS), an antenna port (e.g., a demodulation reference signal (DMRS) port), an antenna port group (e.g., a DMRS port group), a group (e.g., a spatial relation group, a code division multiplexing (CDM) group, a reference signal group, a CORESET group, a physical uplink control channel (PUCCH) group, a PUCCH resource group), a resource (e.g., a reference signal resource, an SRS resource), a resource set (e.g., a reference signal resource set), a CORESET pool, a transmission configuration indication state (TCI state) for the downlink (DL TCI state), a TCI state for the uplink (UL TCI state), a unified TCI state, a common TCI state, a quasi-co-location (QCL), a QCL assumption, etc. can also be rewritten with each other.

[0226] In the present disclosure, "capable of..." can also be rewritten with "supporting / reporting the capability of...".

[0227] In the present disclosure, a b c , a_b^c can also be rewritten with each other. In the present disclosure, a b , a_b can also be rewritten with each other. In the present disclosure, a c, a^c can also be rewritten mutually. In this disclosure, ceil(x), ceiling function (ceiling function), and ceiling function can also be rewritten mutually. In this disclosure, floor(x), floor function (floor function), and floor function can also be rewritten mutually.

[0228] In this disclosure, basis, DFT basis, basis vector, and DFT basis vector can also be rewritten mutually. In this disclosure, SD basis, SD-DFT basis, beam, SD beam, SD vector, and SD 2D-DFT vector can also be rewritten mutually. In this disclosure, L, number of SD beams, number of beams, and number of SD 2D-DFT vectors can also be rewritten mutually. In this disclosure, FD basis, FD-DFT basis, f i , FD beam, FD vector, FD basis vector, and FD-DFT basis vector can also be rewritten mutually.

[0229] In this disclosure, combination coefficient, LC coefficient, subband complex LC coefficient, and combination coefficient matrix can also be rewritten mutually. In this disclosure, co-phasing (phase relationship), phase matching, phase compensation, phase adjustment, phase difference, phase relationship, phase combination, and phase can also be rewritten mutually. In this disclosure, difference, relative can also be rewritten mutually. In this disclosure, amplitude, amplitude coefficient can also be rewritten mutually. In this disclosure, phase, phase coefficient can also be rewritten mutually. In this disclosure, strongest coefficient, strongest amplitude coefficient, and strongest amplitude can also be rewritten mutually. In this disclosure, quantization table, quantization method can also be rewritten mutually.

[0230] In this disclosure, size, length, number can also be rewritten mutually.

[0231] (Wireless communication method)

[0232] In each embodiment, TRP, CMR, NZP-CSI-RS resource, and CRI can also be rewritten mutually. In each embodiment, group / set of TRP, group / set of CMR, group / set of NZP-CSI-RS resources, and group / set of CRI can also be rewritten mutually.

[0233] In each embodiment, X TRPs, X-TRP, X panels, and Ng panels can also be rewritten mutually. In each embodiment, CJT using X TRPs, CJT using X panels, and X-TRP CJT can also be rewritten mutually.

[0234] In each embodiment, the reference CSI, the CSI for the reference TRP, and the first reported CSI may also be rewritten with 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 be rewritten with each other. In each embodiment, the TRP, the CSI-RS resource, the CMR, the CMR group, and the CSI-RS resource set may also be rewritten with each other.

[0235] In each embodiment, multi-TRP, multi-panel, intra-site multi-TRP, and inter-site multi-TRP may also be rewritten with each other.

[0236] In each embodiment, inter-TRP, inter-panel, inter-TRP difference, and inter-TRP comparison may also be rewritten with each other.

[0237] In each embodiment, inter-TRP CSI, inter-TRP CJT CSI, inter-panel CSI, the CSI of other TRPs relative to the CSI of a reference TRP, and the CSI of other TRPs relative to the CSI of a reference panel may also be rewritten with each other. In each embodiment, the CSI per-TRP and the CSI per-panel may also be rewritten with each other.

[0238] In each embodiment, the inter-TRP phase index and the inter-TRP phasing index may also be rewritten with each other. In each embodiment, the inter-TRP index and the inter-TRP coefficient index may also be rewritten with each other. In each embodiment, the inter-TRP phase matrix and the inter-TRP phasing matrix may also be rewritten with each other. In each embodiment, the inter-TRP matrix and the inter-TRP coefficient matrix may also be rewritten with each other. In each embodiment, the inter-TRP phase codebook and the inter-TRP phasing codebook may also be rewritten with each other. In each embodiment, the inter-TRP codebook and the inter-TRP coefficient codebook may also be rewritten with each other.

[0239] In each embodiment, the reporting / content of CSI may be applied to both sub-band reporting and wideband reporting.

[0240] In the example of CSI in the figures of each embodiment, the CSI for X TRPs may also include the CSI from the CSI of the first TRP to the CSI of the Xth TRP. Regarding the CSI of the ith TRP in the figures of each embodiment, the number / position of NZCs is represented by a matrix of 2L i rows (SD beams) and M i columns (FD bases). M i can be either a common value M for X TRPs or a separate value for each TRP.

[0241] Figure 5 An example of a parameter combination for the Rel.16 type 2 codebook is shown. Figure 6 An example of a parameter combination for the Rel.17 type 2 port selection codebook is shown.

[0242] In each embodiment, for the parameters of the SD base, LL, the number of beams L, the codebook parameter α, the codebook parameter setting, the parameter combination, the parameter, the parameter related to the number of SD base vectors, one or more parameters related to the number of SD base 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 respectively i can also be rewritten with each other.

[0243] <Embodiment #1>

[0244] When the reporting of the SD base is supported / set, the base station can also set one or more candidate values of LLi for each TRP i, and the UE can also select and report one of the one or more candidate values. When the selection and reporting of the SD base are supported / set, the base station can also set one or more candidate values of LL tot for all TRPs, and the UE can also select and report one of the one or more candidate values.

[0245] In Embodiment #C1 / #C2, when LL i is set to 4, LL i means the maximum value, and the UE can select and report LL 1,report = {1, 2, 3, 4} or {0, 1, 2, 3, 4}. In Embodiment #1, the base station can set the candidate value LL1 = {2, 4}, and the UE can report LL 1,report= {2, 4} or {0, 2, 4}. The selection of 0 SD bases and whether reporting is allowed can also be associated with the TRP selection setting in Embodiment #B2 / #B3 / #C1 / #C2. This setting can also be a setting independent of the setting of LL.

[0246] It is also possible to introduce UE capabilities related to the maximum value of LL for each TRP i of i and UE capabilities related to the candidate values of LL for each TRP i of i and at least one of UE capabilities related to the maximum value of LL across multiple TRPs tot and UE capabilities related to the candidate values of LL across multiple TRPs tot .

[0247] According to this embodiment, the UE can select / report an appropriate value of LL.

[0248] <Embodiment #2>

[0249] For each TRP i the index of the SD base can also be reported by ceil(log2(C(N1N2, LL i,report )) bits. Its size is the number of bits required to indicate the LL i,report vectors selected from N1N2 vectors. This index can also be transmitted within CSI Part 2. For each TRP i , its size (number of bits) is determined by LL i,report . In this case, it is not clear how to report LL i,report and its size.

[0250] For the aforementioned selection method 2, the following Embodiment #2-1 or #2-2 can also be applied.

[0251] - Embodiment #2-1

[0252] For each TRP i the LL i,report can also be reported within CSI Part 1. The size of LL i,report can also be fixed.

[0253] -- Option 1

[0254] For each TRP i the LL i,report size can also be determined by the set maximum value LL i of LL i for each TRP i,max .

[0255] LL i,report can also be reported by ceil(log2(LL i,max )) bits. It can also be that when LL i,max is set to 4, 2 bits are needed to indicate LL i = {1, 2, 3, 4}. The TRP selection can also be represented by an N TRP -bit bitmap. For the TRP reported as 0 (not selected), the reported LL i value can also be omitted by NW, but to enable the base station and UE to have a common understanding related to the size of CSI Part 1, it is preferred that the size of the reported LL i value is occupied within the CSI report.

[0256] LL i,report can also be reported by ceil(log2(1 + LL i,max )) bits. It can also be that when LL i,max is set to 4, 3 bits are needed to represent LL i = {0, 1, 2, 3, 4}. It can also be set that there is no need for an N TRP -bit bitmap for representing the TRP selection.

[0257] -- Option 2

[0258] For each TRP i of LL i,report , the size can also be determined by the number of candidate values CandNo i of LL i for each TRP i .

[0259] LL i,report can also be reported by ceil(log2(CandNo i )) bits. It can also be that when 2 candidate values LL i = {2, 4} are set, CandNo i = 2, and 1 bit is needed to represent LL i = {2, 4}. The TRP selection can also be represented by an N TRP -bit bitmap. For the TRP reported as 0 (not selected), the reported LL i value can also be omitted by NW, but to enable the base station and UE to have a common understanding related to the size of CSI Part 1, it is preferred that the size of the reported LL i value is occupied within the CSI report.

[0260] LL i,reportIt can also be reported by ceil(log2(1 + CandNo i )) bits. It can also be that, when two candidate values LL i = {2, 4} are set, CandNo i = 2, and 2 bits are required to represent LL i = {0, 2, 4}. It can also be set to a bitmap that does not require N TRP bits for representing TRP selection.

[0261] - Embodiment #2 - 2

[0262] For each TRP i 's LL i,report It can also be reported within a new CSI part (e.g., CSI part 1.5). CSI part 1.5 can also be after CSI part 1 and before CSI part 2. The size of LL i,report can also be determined by the content reported within CSI part 1. The reported value of LL i,report can also determine the size of CSI part 2.

[0263] - - Option 3

[0264] For the selected TRP i 's LL i,report 's size can also be determined by the maximum value LL i of LL i set for each TRP i,max .

[0265] LL i,report can also be reported by ceil(log2(LL i,max )) bits. It can also be that, when LL i,max = 4 is set, 2 bits are required to represent LL i = {1, 2, 3, 4}. For a TRP reported as 0 (not selected) by the bitmap of N TRP bits for TRP selection, the UE may not report LL i,report . The size of LL i,report for a non - selected TRP can also be 0 bits. For example, it can also be that, for the selected TRP i , when LL i,max = 4 is set, 2 bits are required to represent LL i = {1, 2, 3, 4}.

[0266] - - Option 4

[0267] For the selected TRP iof LL i,report The size of can also be determined for each TRP i of LL i by the number of candidate values CandNo i .

[0268] LL i,report can also be reported by ceil(log2(CandNo i )) bits. For a TRP reported as 0 (not selected) by an N TRP -bit bitmap for TRP selection, the UE may also not report LL i,report . For the LL i,report of a non-selected TRP, the size can also be 0 bits. For example, it can also be that for a selected TRP i , when 2 candidate values LL i = {2, 4} are set, CandNo i = 2, and 1 bit is required to represent LL i = {2, 4}.

[0269] -- Option 5

[0270] Since there is a constraint of L tot = Σ n＝1 N L n , if L tot becomes smaller, the possible combinations of LL i,report become fewer. From a mathematical perspective, this can also be equivalent to dividing L tot into X groups, and X can also be the number of selected TRPs. Therefore, the combinations of LL tot can be represented by ceil(log2(C(L i,report , (X - 1)))) bits. The size of the LL i,report for the selected TRPi can also be min{ceil(log2(C(L tot , (X - 1)))), ceil(log2(LL i,max ))} bits.

[0271] -- Option 6

[0272] For the same reason as Option 5, the size of the LL i,report for the selected TRPi can also be min{ceil(log2(C(L tot , (X - 1)))), ceil(log2(CandNo i ))} bits.

[0273] For the aforementioned selection method 3 / 4, the aforementioned options 1 / 2 / 3 / 4 / 5 / 6 can also be applied. In the case of applying options 5 / 6, preferably, for all the TRPs, the total number L of selected SD bases tot,report is reported within CSI part 1 by the UE. It can also be the maximum number L of the total number of SD bases for all the TRPs total,max,configured is set, and the size of L tot,report is associated with this maximum number L total,max,configured . For example, the size of L tot,report can also be ceil(log2(L total,max,configured )) bits. For option 5, the size of L tot,report can also be min{ceil(log2(C(L tot,report ,(X - 1)))), ceil(log2(LL i,max ))} bits. For option 6, the size of L tot,report can also be min{ceil(log2(C(L tot,report ,(X - 1)))), ceil(log2(LL i,max ))} bits.

[0274] RRC signaling / UE capabilities for Embodiment #2 - 1 / #2 - 2 / Options 1 / 2 / 3 / 4 / 5 / 6 can also be introduced.

[0275] The UE can also start decoding CSI part 1.5 after the decoding of CSI part 1 is completed.

[0276] To enable Embodiment #2 - 2 (CSI part 1.5), preferably, CSI part 1 or CSI part 2 is separately encoded (Polar coding), and CSI part 1 or CSI part 2 is mapped to different REs.

[0277] The REs to which CSI part 1.5 is mapped can also be at least one of the following RE1 to 4.

[0278] [RE1] A part of the existing CSI part 2. In this case, it does not affect the decoding of UL - SCH (PUSCH) / CSI part 1, but only affects the decoding of CSI part 2. As Figure 7A in the example, CSI part 1.5 and the new CSI part 2 can also be mapped to the REs used for the existing CSI part 2.

[0279] [RE2] A part of the existing CSI part 1. In this case, it does not affect the decoding of UL - SCH (PUSCH) / CSI part 2, but only affects the decoding of CSI part 1. As Figure 7BSimilar to the example in , the new CSI part 1 and CSI part 1.5 can also be mapped to the REs for the existing CSI part 1.

[0280] [RE3] A part of the existing UL-SCH. In this case, it does not affect the decoding of CSI part 1 / CSI part 2, but only affects the decoding of UL-SCH (PUSCH). As Figure 7C in the example of , CSI part 1.5 can also be mapped to the REs other than those for the existing CSI part 1 and the existing CSI part 2 within the existing UL-SCH.

[0281] [RE4] A part of the existing CSI part 1 / 2. The new RE mapping for CSI part 1 / 1.5 / 2 can also be introduced. In this case, it does not affect the decoding of UL-SCH (PUSCH). As Figure 7D in the example of , when reporting CSI part 1.5, the new CSI part 1, CSI part 1.5, and the new CSI part 2 can also be mapped to the REs for the existing CSI part 1 and the existing CSI part 2.

[0282] When the RE mapping in the time domain is in the order of CSI part 1, 1.5, 2, the base station can start decoding each CSI part earlier. The base station can also start decoding multiple CSI parts in the same symbol.

[0283] According to this embodiment, the UE can appropriately report the SD basis corresponding to multiple TRPs.

[0284] <Question #A2>

[0285] Regarding β (the parameter within paramCombination set by RRC) set by RRC to control the maximum number of NZCs for each layer and all layers, the following two options are being studied.

[0286] [NZC parameter a] The same β for all TRPs.

[0287] [NZC parameter b] Different β for each TRP.

[0288] K0 is the maximum number of NZCs for each layer. 2K0 is the maximum number of NZCs for all layers. Here, K0 = ceil(β2LM1), or K0 = ceil(β2K1M). 2L is the number of SD beams in the Rel.16 enhanced type 2 codebook. K1 is the number of ports selected in the Rel.17 port selection codebook.

[0289] The maximum number of NZCs is used to control the upper limit of the size of the PMI that the UE can report. A larger K0 has better DL performance but a larger UCI overhead.

[0290] Furthermore, the setting of introducing the following restrictions is being studied.

[0291] · The maximum number of NZCs corresponding to each layer among all X TRPs within one CSI-ReportConfig.

[0292] · The maximum number of NZCs corresponding to all layers among all X TRPs within one CSI-ReportConfig.

[0293] In the bitmap reported to represent NZCs, the bitmap for each TRP is being studied.

[0294] However, the details of the restrictions / reporting on NZCs are not clear.

[0295] Thus, the research on the setting / decision / reporting related to CJT CSI is not sufficient.

[0296] <Implementation #A2>

[0297] This implementation relates to the bitmap of NZC for Problem #A2.

[0298] 《Bit Figure 1 》

[0299] The bitmap for each TRP can also be reported. In the Rel.16 type 2 codebook, the size of each bitmap is 2LM. In the Rel.17 type 2 port selection codebook, the size of each bitmap is K1M. The X individual bitmaps can also be reported.

[0300] 《Bit Figure 2 》

[0301] A single bitmap (joint bitmap) for all TRPs (X TRPs) can also be reported. The size of this joint bitmap can be either Σ i＝1 X 2L i M i , or Σ i＝1 X K 1,i M i .

[0302] 《Bitmap 3》

[0303] The bitmap for each group of CMR / TRP can also be reported. If the SD beams are different for each TRP, the number of bits in the bitmap for Y TRPs within one group can be either Σ i＝1Y 2L i M i It can also be Σ i＝1 Y K 1,i M i If the SD beams of each TRP in a group are the same, the number of bits in the bitmap for Y TRPs in a group can be either 2L i M i or K 1,i M i .

[0304] In Figure 8 's example, the first CMR group is associated with the CSI of the first TRP and the CSI of the second TRP. In the CSI of the first TRP and the CSI of the second TRP, the same N = M v 1 = 4 FD bases are used. Within the first CMR group, different SD beams are used for the first TRP and the second TRP. For the first TRP, 2L1 SD beams are used, and for the second TRP, 2L2 SD beams are used. The number of bits in the bitmap for the first CMR group can also be 2L1M v 1 + 2L2M v 1 .

[0305] In Figure 9 's example, the first CMR group is associated with the CSI of the first TRP and the CSI of the second TRP. In the first TRP and the second TRP, the same N = M v 1 = 4 FD bases are used. Within the first CMR group, the same 2L 1 SD beams are used for the first TRP and the second TRP. The number of bits in the bitmap for the first CMR group can also be 2L 1 M v 1 .

[0306] Using bits Figure 1 / 2 / 3 can be specified either in the specification or set through RRC IE.

[0307] According to this embodiment, the UE can appropriately determine / report the bitmap of NZC for CJT CSI.

[0308] <Question #B2>

[0309] Explanation of "β that is the same for all TRPs" (NZC parameter a) #1 (NZC parameter 1): β is set to be the same for each TRP, and the maximum number of NZCs for each layer or all layers is considered for each TRP. For example, when β = 1 / 2, for each TRP, for one layer per TRP, up to 50% of the number of NZCs can be reported.

[0310] Explanation of "β that is the same for all TRPs" (NZC parameter a) #2 can also be to apply one set β for all TRPs to limit the total number of NZCs for all TRPs. It can also be to apply one set β for all TRPs regardless of the maximum number of NZCs for each TRP.

[0311] It is also possible to consider the maximum number of the total number of NZCs corresponding to each layer for all TRPs (regardless of the limitations for each TRP).

[0312] It is also possible to consider the maximum number of the total number of NZCs corresponding to all layers for all TRPs (regardless of the limitations for each TRP).

[0313] In the (Rel.16) enhanced type 2 codebook or the (Rel.17) enhanced type 2 port selection codebook, a bitmap is used to represent the NZCs in W2. There is at least one '1' in this bitmap.

[0314] In the CJT CSI after Rel.18, if the codebook structure of the aforementioned CJT CSI is considered, W2 is jointly selected for multiple TRPs. It is not clear whether it is allowed that no NZCs are selected / reported for a certain TRP in the bitmap for NZCs.

[0315] <Embodiment #B2>

[0316] This embodiment relates to Problem #B2. The UE can also follow any one of the following several options.

[0317] 《Option 1》

[0318] It is not allowed that no NZCs for a TRP are selected / reported. At least one NZC is selected / reported for each TRP. It can also be that the minimum number of NZCs selected / reported for a TRP is 1.

[0319] In the bitmap representing NZCs for each TRP, there can also be at least one '1'. The signaling can be either a separate bitmap for each TRP or a combined bitmap for multiple TRPs.

[0320] 《Option 2》

[0321] It is allowed that for one TRP, no NZC is selected / reported. It can also be that the minimum number of NZCs selected / reported for one TRP is 0.

[0322] In Figure 10 and Figure 11 example, the number M of FD bases for 4 TRPs i is the common value M = 4. The number 2L1 of SD beams for the first TRP is 8, and the numbers 2L2 = 2L3 = 2L4 of SD beams for the other TRPs are 4. Therefore, the number 2L1*M of coefficients for the first TRP on one layer is 32, and the numbers 2L2*M = 2L3*M = 2L4*M of coefficients for the other TRPs on this layer are 16. In this example, the number M of FD bases i is a common value for X TRPs, but it can also be individual values for each TRP. β = 1 / 2 limits the maximum number of NZCs reported for each TRP. The actually reported number of NZCs can also be less than the maximum number of NZCs.

[0323] In Figure 10 example, using Interpretation #1 and β = 1 / 2, in the fourth TRP CSI, no NZC is selected / reported. In Figure 11 example, using Interpretation #2 and β = 1 / 4, in the third TRP CSI, no NZC is selected / reported. In Option 1, it can also be not allowed Figure 10 and Figure 11 at least one example. In Option 2, it can also be allowed Figure 10 and Figure 11 at least one example.

[0324] It can also be allowed the special case where all selected / reported NZCs are obtained from one same TRP.

[0325] In the case where for one TRP, no NZC is selected / reported, the bitmap indicating the NZC for this TRP can also be omitted in the report. Thus, the report overhead can be reduced.

[0326] Regarding which TRP's bitmap to omit, in order to ensure that the UE and the base station have a common understanding, the UE / base station can also follow at least one of the following several options.

[0327] [Option 2-1]

[0328] Within the CSI part 1 with a fixed size, the actual (reported) number of NZCs for each TRP is reported. For example, in the case where [8, 2, 3, 0] is reported as the number of NZCs for 4 TRPs, within the CSI part 2 with a variable size, there may also be no bitmap and NZC for the fourth TRP.

[0329] [Option 2-2]

[0330] Within the CSI part 1 with a fixed size, the total actual (reported) number of NZCs for all TRPs is reported. One or more additional bits (bitmap) for indicating whether each TRP has an NZC may also be used. For example, in the case where 13 is reported as the total number of NZCs, an additional bitmap 1110 for indicating whether each TRP has an NZC may also be used. The value '0' therein may also mean that the fourth TRP does not have an NZC. The bit position i within this bitmap may also correspond to the i-th TRP.

[0331] UE capabilities related to supporting the omission of the TRP-specific NZC bitmap may also be introduced. For example, it may also be that this option 2 reporting is set to be used only when the codebook structure 2 of the aforementioned CJT CSI is supported and the corresponding UE capabilities are reported.

[0332] RRC configurations indicating either option 1 or option 2 of this embodiment may also be supported / introduced.

[0333] The maximum number of TRPs for which the omission of the bitmap may be applied may also be restricted. For example, the reporting of the bitmap / NAC corresponding to at most one TRP may also be omitted.

[0334] According to this embodiment, the UE can appropriately report the NZCs for each TRP.

[0335] <Embodiment #B3>

[0336] This embodiment relates to option 2 of embodiment #B2. In the case where no NZC is selected / reported for a certain TRP, (assuming that the NW sets the UE to report the CJT CSI for N TRPs), it is not clear whether the SD base for this TRP needs to be reported.

[0337] The UE may also follow any one of the following several options.

[0338] [Option 3-1]

[0339] In the case where no NZC is selected / reported for a certain TRP, the SD basis for that TRP is reported within W1. In this case, the UE can also maintain the CJT CSI report for N TRPs as set.

[0340] [Option 3-2]

[0341] In the case where no NZC is selected / reported for a certain TRP, the SD basis for that TRP is omitted from reporting.

[0342] When applying Option 2-1 / 2-2 in Embodiment #B2 and not being instructed to report the bitmap and NZC for a certain TRP, the UE can also not report the CRI indicator or the TRP indicator, and can also not report the SD basis indicator for that TRP. In this case, the overhead of the CSI report can be further reduced.

[0343] UE capabilities related to whether to support the omission of the TRP-specific SD basis can also be introduced. For example, Option 3-2 can be supported and set only when the corresponding UE capabilities are reported.

[0344] The UE can also report the CJT CSI for (N-1), (N-2),... TRPs.

[0345] RRC settings between Option 3-1 and Option 3-2 can also be supported.

[0346] The TRPs to which Option 3-2 is applied for omission can also be limited to a maximum number. For example, the bitmap and NZC of at most one TRP can be omitted.

[0347] According to this embodiment, even in the case where no NZC is selected / reported for a certain TRP, the UE can appropriately report the CJT CSI.

[0348] <Embodiment #C1>

[0349] This embodiment relates to the setting related to the number of SD basis vectors. The number of SD basis vectors can also be set by a parameter within paramCombination (for example, paramCombination-rX, where X can be 18 or more). For example, this parameter can be LL or other parameters. The setting of the number of SD basis vectors can also follow at least one of the following several options / variations.

[0350] 《Option 1》

[0351] To set different numbers of SD basis vectors for each TRP / TRP group, use either of the following Option 1a and Option 1b.

[0352] [Option 1a]

[0353] A separate paramCombination is set for each TRP / TRP group. Alternatively, different values of the parameter combination (paramCombination) are set for each TRP / TRP group.

[0354] [Option 1b]

[0355] A separate LL is set for each TRP / TRP group. Alternatively, different values of the LL are set for each TRP / TRP group. Parameters other than the LL within the paramCombination can be values for each TRP, values common to multiple TRPs, values for each TRP group, or values common to multiple TRP groups.

[0356] 《Option 2》

[0357] To set the same number of SD basis vectors for all TRP / TRP groups, use either of the following Option 2a and Option 2b.

[0358] [Option 2a]

[0359] A common paramCombination is set for all TRP / TRP groups.

[0360] [Option 2b]

[0361] A common LL is set for all TRP / TRP groups. For example, a common LL can be set for TRP#1 / #2 / #3 / #4. Parameters other than the LL within the paramCombination can be values for each TRP, values common to multiple TRPs, values for each TRP group, or values common to multiple TRP groups.

[0362] 《Option 3》

[0363] The total number of SD basis vectors for all TRP / TRP groups is set via the paramCombination or the LL.

[0364] In the case where the number of SD basis vectors set within Option 1 / 2 is not the actual number of SD basis vectors in the report but the maximum number of SD basis vectors, Option 3 can also be combined with Option 1 / 2. For example, in the case where the UE determines the actual number of SD basis vectors for each TRP, the UE can also be considered to have the value set by Option 1 / 2 limited to the maximum number for each TRP / TRP group.

[0365] 《Variation》

[0366] For example, different options can also be set / used for multiple different codebook patterns.

[0367] According to this embodiment, the UE can be appropriately set the number of SD basis vectors.

[0368] <Embodiment #C2>

[0369] This embodiment relates to the selection of the UE's SD basis vectors. In this embodiment, the set number can also be represented by the setting related to the number of SD basis vectors in Embodiment #C1. The UE can also follow at least one of the following several options / variations.

[0370] 《Option 1》

[0371] The UE follows the number LL set for the selection and reporting of the SD basis vectors for each TRP#i i .

[0372] This option can also be applied to Option 1 / 2 of Embodiment #C1. For example, it can be that when LL1 = 4, LL2 = 2, LL3 = 1, LL4 = 1, the UE reports 4 SD basis vectors for TRP#1, 2 SD basis vectors for TRP#2, 1 SD basis vector for TRP#3, and 1 SD basis vector for TRP#4.

[0373] For Option 3 of Embodiment #C1, this option may also require the following enhancements.

[0374] [Enhancement]

[0375] The UE needs to determine the number of SD basis vectors selected per TRP / TRP group. Further, the UE can either report the number of SD basis vectors selected per TRP / TRP group or report the association between each SD basis vector and the ID of a TRP / TRP group. For example, it can also be that when LL = 6 (the total number of SD basis vectors for all TRPs), the UE reports the number of SD basis vectors as 2 for TRP#1, 2 for TRP#2, 1 for TRP#3, and 1 for TRP#4.

[0376] Option 2

[0377] The set number can also be the maximum number LL of SD basis vectors, and the UE can also select / report less than LL SD basis vectors. It can also be that the UE needs to determine the number of SD basis vectors selected per TRP / TRP group. Further, the UE can either report the number of SD basis vectors selected per TRP / TRP group, or report the total number of selected SD basis vectors, or report the association between each SD basis vector and the ID of a TRP / TRP group. Such a setting (e.g., the setting of the maximum number of SD basis vectors) can also be activated by new RRC parameters.

[0378] The UE can also follow either Option 2a or Option 2b below.

[0379] [Option 2a]

[0380] Even if the UE selects less than the set number LL of SD basis vectors, the UE can ensure reporting at least one SD basis vector for each TRP / TRP group. To activate this option, a new RRC parameter can also be set. In this case, when LL i = 1 is set for a TRP#i, the UE may not need to report the number of SD basis vectors selected for that TRP#i.

[0381] [Option 2b]

[0382] The UE can also decide that there are no SD basis vectors reported for a certain TRP / TRP group (the number of reported SD basis vectors is zero). To activate this option, a new RRC parameter can also be set.

[0383] Figure 12 Shows an example of the combination of Embodiment #C1 and Embodiment #C2 for 4 TRPs, namely TRP#1, #2, #3, and #4. LL iIs the number of SD base vectors set for TRP#i. LL i,rep Is the number of SD base vectors reported for TRP#i. LL Is the total number of SD base vectors set for all TRPs. LL rep Is the total number of SD base vectors reported for all TRPs. For the combination of Option 1 / 2 of Embodiment #C1 and Option 2a of Embodiment #C2, when LL1 = 4, LL2 = 2, LL3 = 1, LL4 = 1, the UE may also report LL 1,rep = 2, LL 2,rep = 2, LL 3,rep = 1, LL 4,rep = 1. For the combination of Option 1 / 2 of Embodiment #C1 and Option 2b of Embodiment #C2, when LL1 = 4, LL2 = 2, LL3 = 1, LL4 = 1, the UE may also report LL 1,rep = 2, LL 2,rep = 2, LL 3,rep = 0, LL 4,rep = 0. For the combination of Option 3 of Embodiment #C1 and Option 2a of Embodiment #C2, when LL = 6, since the number of SD base vectors reported for each TRP is 1 or more, LL rep Is 4 or more than the number of TRPs. In this case, the UE may also determine LL rep = 5, report LL 1,rep = 2, LL 2,rep = 1, LL 3,rep = 1, LL 4,rep = 1. For the combination of Option 3 of Embodiment #C1 and Option 2b of Embodiment #C2, when LL = 6, the UE may also determine LL rep = 3, report LL 1,rep = 2, LL 2,rep = 1, LL 3,rep = 0, LL 4,rep = 0.

[0384] 《Variant》

[0385] For example, different options / choices may be set / used for different multiple codebook patterns.

[0386] According to this embodiment, the UE can appropriately determine / report the number of SD base vectors.

[0387] <Supplement>

[0388] [Notification of Information to the UE]

[0389] The notification of any information from the network (Network (NW)) (e.g., Base Station (BS)) to the UE (in other words, the reception of any information from the BS by the UE) in the above-described embodiments 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.

[0390] In the case where the above notification is performed via MAC CE, the MAC CE may also be identified by including a new Logical Channel ID (LCID) not specified in the existing specifications in the MAC sub-header.

[0391] In the case where the above notification is performed via DCI, the above notification may also be performed by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used in the scrambling of the Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0392] In addition, the notification of any information to the UE in the above-described embodiments may also be performed periodically, semi-persistently, or aperiodically.

[0393] [Notification of Information from UE]

[0394] The notification of any information from the UE (to the NW) (in other words, the transmission / reporting of any information from the UE to the BS) in the above-described embodiments may also be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0395] In the case where the above notification is performed via MAC CE, the MAC CE may also be identified by including a new LCID not specified in the existing specifications in the MAC sub-header.

[0396] In the case where the above notification is performed via UCI, the above notification may also be sent using PUCCH or PUSCH.

[0397] In addition, the notification of any information from the UE in the above-described embodiments may also be performed periodically, semi-persistently, or aperiodically.

[0398] [Applications of Each Embodiment]

[0399] At least one of the above-described embodiments can also be applied to a case that satisfies a specific condition. The specific condition can be either specified in a specification or notified to a UE / BS using higher layer signaling / physical layer signaling.

[0400] At least one of the above-described embodiments can also be applied only to a UE that has reported a specific UE capability or supports the specific UE capability.

[0401] The specific UE capability can also represent at least one of the following:

[0402] · Support for reporting multiple CSIs in the time domain / Doppler domain.

[0403] · Information related to the number of CSI reports that can be processed simultaneously (in the same OFDM symbol).

[0404] In addition, the above specific UE capability can be either a capability that is applied across the entire frequency (commonly regardless of frequency), or a capability for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or a capability for each feature set (Feature Set (FS)) or a feature set per component-carrier (Feature Set Per Component-carrier (FSPC)).

[0405] In addition, the above specific UE capability can be either a capability that is applied across all duplex modes (commonly regardless of the duplex mode), or a capability for each duplex mode (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0406] In addition, at least one of the above-described embodiments can also be applied to a case where a UE is set / activated / trigged by higher layer signaling / physical layer signaling with specific information associated with the above-described embodiments (or an action for implementing the above-described embodiments). For example, the specific information can also be information indicating activation of the functions of each embodiment, any RRC parameters for a specific version (e.g., Rel.18 / 19), etc.

[0407] The UE may also apply actions such as Rel. 15 / 16 without supporting at least one of the above - mentioned specific UE capabilities or without being configured with the above - mentioned specific information.

[0408] (Supplementary Note)

[0409] Regarding an embodiment of the present disclosure, the following inventions are noted.

[0410] [Supplementary Note 1]

[0411] A terminal, comprising:

[0412] a receiving unit that receives a configuration for determining a parameter related to the number of spatial - domain basis vectors for a plurality of transmission points; and

[0413] a control unit that controls the reporting of the spatial - domain basis vectors for the plurality of transmission points based on the configuration.

[0414] [Supplementary Note 2]

[0415] The terminal according to Supplementary Note 1, wherein

[0416] the configuration represents the maximum value of the parameter for each of the plurality of transmission points or the maximum value of the parameter for the plurality of transmission points.

[0417] [Supplementary Note 3]

[0418] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein

[0419] the control unit determines the size of the reporting of the spatial - domain basis vectors for the plurality of transmission points based on the configuration.

[0420] [Supplementary Note 4]

[0421] The terminal according to any one of Supplementary Notes 1 to 3, wherein

[0422] the control unit controls the reporting of channel state information part 1, channel state information part 2, and a part including the parameter.

[0423] (Wireless Communication System)

[0424] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, any one or a combination of the above - mentioned wireless communication methods according to the respective embodiments of the present disclosure is used for communication.

[0425] Figure 13It is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment. The wireless communication system 1 (which may also be simply referred to as system 1) may also be a system that realizes communication by using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5G NR), and the like.

[0426] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0427] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0428] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC))).

[0429] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is configured within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration, number, etc. of each cell and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0430] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of carrier aggregation (CA) and dual connectivity (DC) that uses multiple component carriers (CCs).

[0431] Each CC may also be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub - 6 GHz), and FR2 may be a frequency band higher than 24 GHz (above - 24 GHz). Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to this. For example, FR1 may correspond to a frequency band higher than FR2.

[0432] Furthermore, the user terminal 20 may also communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0433] The multiple base stations 10 may also be connected by wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11, which is equivalent to the upper - level station, may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12, which is equivalent to a relay station (relay), may also be referred to as an IAB node.

[0434] The base station 10 can also be connected to the core network 30 via other base stations 10 or directly. The core network 30 can also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0435] The core network 30 can also include, for example, network functions (NFs) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and an Operation, Administration and Maintenance (Management) (OAM). Additionally, multiple functions can be provided by one network node. Furthermore, communication with an external network (such as the Internet) can be performed via the DN.

[0436] The user terminal 20 can also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0437] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the Downlink (DL) and the Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. can also be used.

[0438] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, in the wireless access methods of the UL and the DL, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used.

[0439] In the wireless communication system 1, as the downlink channel, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. that are shared among the respective user terminals 20 can also be used.

[0440] Furthermore, in the wireless communication system 1, as the uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. that are shared among the respective user terminals 20 can also be used.

[0441] User data, high-layer control information, system information blocks (System Information Block (SIB)), etc. are transmitted via PDSCH. User data, high-layer control information, etc. can also be transmitted via PUSCH. In addition, the Master Information Block (MIB) can also be transmitted via PBCH.

[0442] Low-layer control information can also be transmitted via PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and the downlink control information includes scheduling information for at least one of PDSCH and PUSCH.

[0443] In addition, the DCI for scheduling PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, PDSCH can also be rewritten as DL data, and PUSCH can also be rewritten as UL data.

[0444] In the detection of PDCCH, a control resource set (COntrol REsource SET (CORESET)) and a search space can also be used. A CORESET corresponds to the resource for searching DCI. The search space corresponds to the search area and search method for PDCCH candidates (PDCCH candidates). One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0445] One search space can also correspond to PDCCH candidates corresponding to one or more aggregation levels (aggregation Level). One or more search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. in the present disclosure can also be rewritten with each other.

[0446] Through the PUCCH, it is also possible to transmit uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (e.g., which can also be referred to as Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)). Through the PRACH, it is also possible to transmit a random access preamble for establishing a connection with the cell.

[0447] In addition, in the present disclosure, the downlink, uplink, etc. can also be expressed without "link". Further, it can also be expressed that "Physical" is not included at the beginning of various channels.

[0448] In the wireless communication system 1, it is also possible to transmit a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. In the wireless communication system 1, as the DL-RS, it is also possible to transmit a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc.

[0449] The synchronization signal can, for example, also be at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. can also be referred to as reference signals.

[0450] In addition, in the wireless communication system 1, as the uplink reference signal (UL-RS), it is also possible to transmit a reference signal for measurement (sounding reference signal (SRS)), a demodulation reference signal (DMRS), etc. In addition, the DMRS can also be referred to as a user terminal specific reference signal (UE-specific Reference Signal).

[0451] (Base station)

[0452] Figure 14 FIG. is an example showing the structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. In addition, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

[0453] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it can also be assumed that the base station 10 further has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0454] The control unit 110 implements the overall control of the base station 10. The control unit 110 can be composed of a controller, a control circuit, etc. that can be explained based on the common knowledge in the technical field related to the present disclosure.

[0455] The control unit 110 can also control the generation, scheduling (e.g., resource allocation, mapping), etc. of signals. The control unit 110 can also control the transmission / reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 can also generate data, control information, sequence, etc. to be transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0456] The transmitting and receiving unit 120 may also include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0457] The transmitting and receiving unit 120 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 1211 and an RF unit 122. The receiving unit may also be composed of a receiving processing unit 1212, an RF unit 122, and a measurement unit 123.

[0458] The transmitting and receiving antenna 130 may be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0459] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0460] The transmitting and receiving unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0461] The transmitting and receiving unit 120 (transmitting processing unit 1211), for example, may also perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0462] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering), Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0463] The transmission / reception unit 120 (RF unit 122) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0464] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0465] The transmission / reception unit 120 (reception processing unit 1212) can also perform reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0466] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also perform measurements on received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0467] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30 (e.g., the network node providing the NF), other base stations 10, etc., and may also obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0468] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0469] The transmission / reception unit 120 may also transmit a setting for determining a parameter related to the number of spatial domain basis vectors for a plurality of transmission points. The control unit 110 may also control the reception of reports of the spatial domain basis vectors for the plurality of transmission points based on the setting.

[0470] (User terminal)

[0471] Figure 15 FIG. is an example showing the structure of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0472] In addition, in this example, the functional blocks of the feature part in this embodiment are mainly shown, and it can also be assumed that the user terminal 20 also has other functional blocks required for wireless communication. A part of the processing of each unit described below can also be omitted.

[0473] The control unit 210 implements the overall control of the user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0474] The control unit 210 can also control the generation, mapping, etc. of signals. The control unit 210 can also control the transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission / reception unit 220.

[0475] The transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0476] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be composed of a transmission unit and a reception unit. The transmission unit can also be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit can also be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0477] The transmission / reception antenna 230 can be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna, etc.

[0478] The transmission / reception unit 220 can also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 can also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0479] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of the transmission beam and the reception beam.

[0480] The transmission / reception unit 220 (transmission processing unit 2211) can 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, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0481] The transmission / reception unit 220 (transmission processing unit 2211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0482] In addition, regarding whether to apply DFT processing, it can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when the transform precoding is effective (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform. In other cases, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-mentioned transmission processing.

[0483] The transmission / reception unit 220 (RF unit 222) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0484] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 230.

[0485] The transmission / reception unit 220 (reception processing unit 2212) can also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing on the obtained baseband signal, and obtain user data, etc.

[0486] The transmitting and receiving unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may also perform measurements on 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.

[0487] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230.

[0488] The transmitting and receiving unit 220 may also receive a setting for determining a parameter related to the number of spatial domain basis vectors for a plurality of transmission points. The control unit 210 may also control the reporting of the spatial domain basis vectors for the plurality of transmission points based on the setting.

[0489] The setting may also represent the maximum value of the parameter for each of the plurality of transmission points, or the maximum value of the parameter for the plurality of transmission points.

[0490] The control unit may also determine the size of the reporting of the spatial domain basis vectors for the plurality of transmission points based on the setting.

[0491] The control unit may also control the reporting of channel state information part 1, channel state information part 2, and the part including the parameter.

[0492] (Hardware Structure)

[0493] In addition, 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. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block may be implemented by a single device physically or logically combined, or two or more physically or logically separated devices may be directly or indirectly (e.g., by wire, wireless, etc.) connected and implemented by these multiple devices. The functional block may also be implemented by combining the above single device or the above multiple devices with software.

[0494] Here, in terms of functions, there are judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuration (setting), reconfiguration (re - setting), allocation (allocating, mapping), assignment, etc., but not limited to these. For example, a functional block (structural unit) that implements the transmission function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and its implementation method is not particularly limited.

[0495] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may also function as a computer that processes the wireless communication method of the present disclosure. Figure 16 FIG. is an example showing the hardware structure of a base station and a user terminal according to an embodiment. The above - mentioned base station 10 and user terminal 20 may physically also be 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, and a bus 1007, etc.

[0496] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be rewritten with each other. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

[0497] For example, only one processor 1001 is shown in the figure, but there may be multiple processors. In addition, the processing may be executed by one processor, or may be executed simultaneously, sequentially, or by other means by two or more processors. Additionally, the processor 1001 may also be implemented by one or more chips.

[0498] Regarding each function in the base station 10 and the user terminal 20, for example, by loading a specific software (program) onto hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or realizes it by controlling at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0499] The processor 1001 enables, for example, an operating system to operate to control the entire computer. The processor 1001 may also be constituted by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, at least a part of the above-described control unit 110 (210), transmission / reception unit 120 (220), etc. may also be implemented by the processor 1001.

[0500] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes based on them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments may be used. For example, the control unit 110 (210) may also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same applies to other functional blocks.

[0501] The memory 1002 may also be a computer-readable recording medium, and may be constituted by, for example, at least one of a read-only memory (Read Only Memory (ROM)), an erasable programmable read-only memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable read-only memory (Electrically EPROM (EEPROM)), a random access memory (Random Access Memory (RAM)), and other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0502] The storage 1003 may also be a computer-readable recording medium, and may be constituted by, for example, at least one of a flexible disc, a floppy (registered trademark) disc, an optical disc (e.g., a compact disc (Compact Disc ROM (CD-ROM))), a digital versatile disc, a Blu-ray (registered trademark) disc, a removable disc, a hard disk drive, a smart card, a flash device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0503] The communication device 1004 is hardware (a transmitting and receiving device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. In order to implement at least one of, for example, 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 above-described transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated and implemented by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0504] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. In addition, the input device 1005 and the output device 1006 may also have an integrated structure (e.g., a touch panel).

[0505] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be constituted by a single bus or may be constituted by different buses between the respective devices.

[0506] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), etc., and a part or all of each functional block may also be implemented by this hardware. For example, the processor 1001 may also be implemented using at least one of these hardwares.

[0507] (Modification example)

[0508] In addition, terms described in this disclosure and terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may also be rewritten with each other. In addition, a signal may also be a message. A reference signal can also be abbreviated as RS and may also be referred to as a pilot, a pilot signal, etc. according to the applied standard. In addition, a component carrier (Component Carrier (CC)) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0509] A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) independent of the numerology.

[0510] Here, the numerology may also be a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, the numerology may also represent at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (Transmission Time Interval (TTI)), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transmitter-receiver in the frequency domain, a specific windowing process performed by a transmitter-receiver in the time domain, etc.

[0511] A time slot may also be composed of one or more symbols (orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, single carrier frequency division multiple access (Single Carrier Frequency Division Multiple Access (SC-FDMA)) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on the numerology.

[0512] A time slot may also include a plurality of mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0513] A radio frame, subframe, time slot, mini-slot, and symbol all represent time units for transmitting signals. A radio frame, subframe, time slot, mini-slot, and symbol may also use other corresponding names. In addition, time units such as frames, subframes, time slots, mini-slots, and symbols in this disclosure can also be rewritten with each other.

[0514] For example, a subframe can also be referred to as a TTI, multiple consecutive subframes can also be referred to as a TTI, a time slot or a mini-slot can also be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in existing LTE, can also be a period shorter than 1 ms (e.g., 1 - 13 symbols), or can also be a period longer than 1 ms. In addition, the unit representing a TTI may not be referred to as a subframe, but as a time slot, mini-slot, etc.

[0515] Here, a TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in units of TTI for each user terminal. In addition, the definition of a TTI is not limited to this.

[0516] A TTI can also be the transmission time unit for data packets (transport blocks), code blocks, codewords, etc. that have undergone channel coding, and can also become the processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (e.g., number of symbols) actually mapped with transport blocks, code blocks, codewords, etc. can also be shorter than the TTI.

[0517] In addition, when a time slot or a 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 become the minimum time unit for scheduling. In addition, the number of time slots (number of mini-slots) constituting the minimum time unit of this scheduling can also be controlled.

[0518] A TTI with a time length of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8 - 12), standard TTI, long TTI, normal subframe, standard subframe, long subframe, time slot, etc. A TTI shorter than a normal TTI can also be referred to as a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini-slot, sub-time slot, time slot, etc.

[0519] In addition, a long TTI (e.g., a normal TTI, subframe, etc.) can also be rewritten as a TTI with a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be rewritten as a TTI with a TTI length less than that of the long TTI and a TTI length of 1 ms or more.

[0520] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, it may also be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0521] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a time slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks respectively.

[0522] In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0523] In addition, a resource block may also be composed of one or more resource elements (REs). For example, one RE may also be a radio resource area of a subcarrier and a symbol.

[0524] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used for a certain parameter set in a certain carrier. Here, the common RBs may also be determined by the index of the RBs based on the common reference point of the carrier. A PRB may also be defined in a certain BWP and be additionally numbered within that BWP.

[0525] A UL BWP (BWP for UL) and a DL BWP (BWP for DL) may also be included in a BWP. For a UE, one or more BWPs may also be set within a carrier.

[0526] At least one of the set BWPs may also be active, and the UE may not assume to transmit and receive specific signals / channels outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0527] In addition, the structures such as the above-mentioned radio frames, subframes, time slots, mini time slots, and symbols are merely illustrative. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini time slots included in a time slot, the symbols included in a time slot or mini time slot, the number of RBs, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0528] In addition, the information, parameters, etc. described in this disclosure can be represented by absolute values, relative values with respect to a specific value, or can also be represented by corresponding other information. For example, radio resources can also be indicated by a specific index.

[0529] In this disclosure, the names used for parameters, etc. are not restrictive names in all aspects. Furthermore, mathematical expressions, etc. using these parameters can also be different from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name. Therefore, the various names assigned to these various channels and information elements are not restrictive names in all aspects.

[0530] The information, signals, etc. described in this disclosure can also be represented using any one of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0531] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer to a lower layer, and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0532] The input and output information, signals, etc. can be stored in a specific location (e.g., a memory), or can be managed using a management table. The input and output information, signals, etc. can be overwritten, updated, or appended. The output information, signals, etc. can also be deleted. The input information, signals, etc. can also be sent to other devices.

[0533] Notification of information is not limited to the manners / embodiments described in this disclosure, and other methods can also be used. For example, notification of the information in this disclosure can 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.

[0534] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling can also be referred to as an RRC message, and can also be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration (RRC Connection Re - setting) message, etc. In addition, MAC signaling can also be notified, for example, using a MAC Control Element (MAC CE).

[0535] In addition, notification of specific information (e.g., notification of "is X") is not limited to explicit notification, and can also be performed implicitly (e.g., by not performing the notification of the specific information, or by notification of other information).

[0536] The determination can be made by a value represented by one bit (0 or 1), can also be made by a true - false value (Boolean value) represented by true or false, and can also be made by a numerical comparison (e.g., comparison with a specific value).

[0537] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, shall be broadly construed 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.

[0538] In addition, software, instructions, information, etc. can also be sent and received via a transmission medium. For example, in the case of sending software from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0539] Terms such as "system" and "network" used in this disclosure can be used interchangeably. "Network" can also mean a device (e.g., a base station) included in the network.

[0540] In this disclosure, terms such as "precoding", "precoder", "weights (precoding weights)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. can be used interchangeably.

[0541] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" can be used interchangeably. There are also cases where the base station is referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0542] A base station can accommodate one or more (e.g., three) cells. When the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within the coverage range.

[0543] In the present disclosure, the base station sending information to the terminal can also be rewritten as the base station instructing the terminal to perform control / operation based on the information.

[0544] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user device (User Equipment (UE))", "terminal" can be used interchangeably.

[0545] There are also cases where the mobile station is referred to by terms such as subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, radio 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.

[0546] At least one of the base station and the mobile station can 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 can also be a device mounted in a moving object, the moving object itself, etc.

[0547] The mobile object refers to an object that can move, with an arbitrary moving speed, and of course also includes the case where the mobile object is stationary. The mobile object includes, for example, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships (ships and other watercraft), airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, hot air balloons, and objects mounted on them. In addition, it is not limited to these. Furthermore, the mobile object can also be a mobile object that autonomously travels based on an operation instruction.

[0548] The mobile object can be either a means of transportation (e.g., vehicles, airplanes, etc.), or a mobile object that moves in an unmanned manner (e.g., drones, autonomous vehicles, etc.), or a robot (humanoid or non-humanoid). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0549] Figure 17 FIG. is an example diagram showing a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a 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.

[0550] The drive unit 41 is constituted by, for example, at least one of an engine, a motor, and a hybrid of an engine and a motor. The steering unit 42 is configured to include at least a steering wheel (also referred to as a handwheel), and steers at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0551] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (I / O) port) 63. Signals from various sensors 50 - 58 provided in the vehicle are input into the electronic control unit 49. The electronic control unit 49 may also be referred to as an electronic control unit (ECU).

[0552] As signals from various sensors 50 - 58, there are the following signals, etc.: a current signal from the current sensor 50 that senses the current of the motor, a rotational speed signal of the front wheel 46 / rear wheel 47 obtained by the rotational speed sensor 51, an air pressure signal of the front wheel 46 / rear wheel 47 obtained by the air pressure sensor 52, a vehicle speed signal obtained by the vehicle speed sensor 53, an acceleration signal obtained by the acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by the accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by the brake pedal sensor 56, an operation signal of the shift lever 45 obtained by the shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 58.

[0553] The information service unit 59 is composed of various devices for providing (outputting) various information such as driving information, traffic information, and entertainment information of a navigation system, an audio system, speakers, a display, a television, a radio, etc., and one or more ECUs for controlling these devices. The information service unit 59 uses the information obtained from an external device via a communication module 60, etc., to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0554] The information service unit 59 may include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) for accepting input from the outside, and may also include an output device (for example, a display, a speaker, an LED lamp, a touch panel, etc.) for implementing output to the outside.

[0555] The driving assistance system unit 64 is composed of a millimeter-wave radar, Light Detection and Ranging (LiDAR), a camera, a positioning detector (e.g., Global Navigation Satellite System (GNSS), etc.), map information (e.g., High Definition (HD) map, Autonomous Vehicle (AV) map, etc.), a gyroscope system (e.g., inertial measurement device (Inertial Measurement Unit (IMU)), inertial navigation device (Inertial Navigation System (INS)), etc.), an Artificial Intelligence (AI) chip, an AI processor, and various devices for providing functions to prevent accidents in advance or reduce the driver's driving burden, and one or more ECUs for controlling these devices. In addition, the driving assistance system unit 64 transmits and receives various information via the communication module 60 to implement the driving assistance function or the autonomous driving function.

[0556] The communication module 60 can communicate with the microprocessor 61 and the structural elements of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 between the driving unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50 - 58 provided in the vehicle 40.

[0557] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49 and is a communication device capable of communicating with an external device. For example, various information is transmitted and received via wireless communication between the communication module 60 and the external device. The communication module 60 can be inside or outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (and can also function as at least one of the base station 10 and user terminal 20).

[0558] The communication module 60 can also transmit, via wireless communication, at least one of the signals from the various sensors 50-58 input to the electronic control unit 49, the information obtained based on the signals, and the information based on the input from the external (user) via the information service unit 59 to an external device. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. can also be referred to as input units that accept inputs. For example, the PUSCH transmitted by the communication module 60 may also include the information based on the above inputs.

[0559] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 can also be referred to as an output unit that outputs information (for example, outputs information to devices such as a display and a speaker based on the PDSCH received by the communication module 60 (or the data / information decoded from the PDSCH)).

[0560] In addition, the communication module 60 stores the various information received from the external device in a memory 62 that can be utilized by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the various sensors 50-58, etc. provided in the vehicle 40.

[0561] In addition, the base station in the present disclosure can also be rewritten as a user terminal. For example, for a structure in which the communication between the base station and the user terminal is replaced by the communication between multiple user terminals (for example, it can also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various aspects / embodiments of the present disclosure can also be applied. In this case, it can also be a structure in which the user terminal 20 has the functions of the above base station 10. In addition, terms such as "uplink" and "downlink" can also be rewritten as terms corresponding to inter-terminal communication (for example, "sidelink"). For example, the uplink channel, the downlink channel, etc. can also be rewritten as the sidelink channel.

[0562] Similarly, the user terminal in the present disclosure can also be rewritten as a base station. In this case, it can also be a structure in which the base station 10 has the functions of the above user terminal 20.

[0563] In the present disclosure, an action performed by a base station may sometimes be performed by its upper node according to circumstances. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal can obviously be performed by the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0564] Each mode / embodiment described in the present disclosure can be used alone, in combination, or switched during execution. In addition, the processing procedures, timings, flowcharts, etc. of each mode / embodiment described in the present disclosure can be changed in order as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented in the illustrated order, but are not limited to the specific order presented.

[0565] Each mode / embodiment described in the present disclosure can 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 an integer or a decimal, for example)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended, modified, generated, or defined based on them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

[0566] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0567] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not comprehensively define the quantity or order of these elements. These terms can be used in this disclosure as a convenient method for distinguishing between more than two elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted, or that the first element must be prior to the second element in a certain form.

[0568] The term "determining" used in this disclosure may involve various operations in some cases. For example, "determining" may also be a case where judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiring) (such as searching in a table, database, or other data structures), ascertaining, etc. are regarded as performing "determining".

[0569] In addition, "determining" may also be a case where receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing data in a memory), etc. are regarded as performing "determining".

[0570] In addition, "determining" may also be a case where resolving, selecting, choosing, establishing, comparing, etc. are regarded as performing "determining". That is, "determining" may also be a case where some operations are regarded as performing "determining".

[0571] In addition, "determining" may also be rewritten as "assuming", "expecting", "considering", etc.

[0572] The "maximum transmit power" described in this disclosure may either refer to the maximum value of the transmit power, or the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0573] As used in this disclosure, terms such as "connected" and "coupled", or all variations thereof, mean all direct or indirect connections or couplings between two or more elements, and can include the situation where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination of them. For example, "connected" can also be rewritten as "access".

[0574] In this disclosure, when two elements are connected, it is possible to consider that they are "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-exhaustive examples, using electromagnetic energy having wavelengths in the radio frequency domain, microwave region, light (both visible and invisible) region, etc.

[0575] In this disclosure, the term "A is different from B" can also mean the meaning of "A and B are different from each other". In addition, this term can also mean the meaning of "A and B are respectively different from C". Terms such as "separated" and "combined" can also be interpreted in the same way as "different".

[0576] When using "include", "including", and their variations in this disclosure, these terms, like the term "comprising", are of an inclusive meaning. Furthermore, the term "or" used in this disclosure does not mean the exclusive or meaning.

[0577] In this disclosure, for example, in the case where articles are added through translation such as a, an, and the in English, this disclosure can also include the case where the nouns following these articles are in the plural form.

[0578] In this disclosure, "below", "less than", "above", "more", "equal to", etc. can also be rewritten with each other. In addition, in this disclosure, words such as "good", "bad", "big", "small", "high", "low", "early", "slow", "wide", "narrow", etc. are not limited to the positive degree, comparative degree, and superlative degree, and can also be rewritten with each other. In addition, in this disclosure, words such as "good", "bad", "big", "small", "high", "low", "early", "slow", "wide", "narrow", etc. as expressions with "the i-th" (i is an arbitrary integer) appended are not limited to the positive degree, comparative degree, and superlative degree, and can also be rewritten with each other (for example, "the highest" can also be rewritten with "the i-th highest").

[0579] In the present disclosure, "of", "for", "regarding", "related to", "associated with", etc. may also be rewritten with each other.

[0580] As described above, the invention related to the present disclosure has been described in detail. However, for those skilled in the art, the invention related to the present disclosure is obviously not limited to the embodiments described in the present disclosure. The invention related to the present disclosure can be implemented in the form of amendments and changes without departing from the gist and scope of the invention determined based on the description in the claims. Therefore, the description of the present disclosure is for the purpose of illustration and does not carry any restrictive meaning for the invention related to the present disclosure.

Claims

1. A terminal, comprising: a receiving unit that receives a setting for determining a parameter related to the number of spatial domain basis vectors for a plurality of transmission points; and a control unit that controls the reporting of the spatial domain basis vectors for the plurality of transmission points based on the setting.

2. The terminal according to claim 1, wherein the setting represents the maximum value of the parameter for each of the plurality of transmission points, or the maximum value of the parameter for the plurality of transmission points.

3. The terminal according to claim 1, wherein the control unit determines the size of the reporting of the spatial domain basis vectors for the plurality of transmission points based on the setting.

4. The terminal according to claim 1, wherein the control unit controls the reporting of channel state information part 1, channel state information part 2, and the part including the parameter.

5. A wireless communication method, which is a wireless communication method of a terminal, comprising: a step of receiving a setting for determining a parameter related to the number of spatial domain basis vectors for a plurality of transmission points; and a step of controlling the reporting of the spatial domain basis vectors for the plurality of transmission points based on the setting.

6. A base station, comprising: a transmitting unit that transmits a setting for determining a parameter related to the number of spatial domain basis vectors for a plurality of transmission points; and a control unit that controls the reception of the reporting of the spatial domain basis vectors for the plurality of transmission points based on the setting.

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