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 of channel state information for a plurality of transmission points; and a control unit that determines the number of non-zero coefficients for each transmission point on the basis of at least one of the minimum number and the maximum number of the non-zero coefficients. According to one embodiment of the present disclosure, an appropriate number of DMRS ports can be used.

Description

Technical Field

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

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

[0003] Successor systems of LTE (also known as, for example, 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 literature

[0005] Non-patent literature

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

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., NR), research is underway to report channel state information (CSI) based on the reception of reference signals. In addition, research is underway to perform DL transmissions to terminals (user terminals, user equipment (UE)) from multiple transmission / reception points (multiple Transmission / Reception Points (TRPs, Multi TRP (MTRP))) or multiple panels (multiple panels, multi-panel). In addition, research is underway to perform coherent joint transmission (CJT) using multiple TRP / multi-panel.

[0009] However, CSI / codebook for CJT has not been fully studied. If such a method is not clearly defined, there is a concern that communication throughput, communication quality, etc. may deteriorate.

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

[0011] Means for solving problems

[0012] A terminal according to one embodiment of the present disclosure includes: a receiving unit for receiving settings of channel state information for multiple transmission points; and a control unit for determining the number of non-zero coefficients for each transmission point based on at least one of a minimum number and a maximum number of non-zero coefficients.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, it is possible to determine appropriate CSI / codebook for CJT. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0018] Figure 4A as well as Figure 4B An example of an enhanced type 2 port selection codebook is shown.

[0019] Figure 5 An example of a bitmap 3 according to implementation #0-1 is shown.

[0020] Figure 6 Another example of the bitmap 3 according to the embodiment #0-1 is shown.

[0021] Figure 7 An example of the interpretation of non-zero coefficient parameters is shown.

[0022] Figure 8 An example of NZC parameters according to Embodiment #1 is shown.

[0023] Fig. 9 Another example of the NZC parameter according to Embodiment #1 is shown.

[0024] Fig.10 An example of NZC according to Embodiment #2 is shown.

[0025] Fig.11 Another example of NZC according to Embodiment #2 is shown.

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

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

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

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

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

[0031] (Multiple TRP)

[0032] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi TRP (MTRP)) using one or more panels (multi-panels) for DL ​​transmission to the UE is being studied. In addition, the UE is studying the use of one or more panels for UL transmission to one or more TRPs.

[0033] In addition, multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID (eg, PCI) or a virtual cell ID.

[0034] Multiple TRPs (TRP#1, #2) can also be connected through an ideal / non-ideal backhaul and exchange information, data, etc. Different code words (Code Word (CW)) and different layers can also be sent from each TRP of the multiple TRPs. Non-Coherent Joint Transmission (NCJT) can also be used as a method of sending multiple TRPs.

[0035] In NCJT, for example, TRP1 performs modulation mapping on a first codeword and performs layer mapping, and uses a first precoding for a first number of layers (e.g., 2 layers) to send a first PDSCH. In addition, TRP2 performs modulation mapping on a second codeword and performs layer mapping, and uses a second precoding for a second number of layers (e.g., 2 layers) to send a second PDSCH.

[0036] In addition, multiple PDSCHs (multi-PDSCHs) that are NCJTed may also be defined to partially or completely overlap with respect to at least one of the time domain and the frequency domain. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP may also overlap.

[0037] These first PDSCH and second PDSCH may also be assumed to be not in a quasi-co-location (QCL) relationship (not quasi-co-located). Reception of multiple PDSCHs may also be rewritten as simultaneous reception of PDSCHs of a certain QCL type (eg, QCL type D).

[0038] Multiple PDSCHs from multiple TRPs (also referred to as multiple PDSCHs) can also be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single-master mode). One DCI can also be sent from one TRP of multiple TRPs. Multiple PDSCHs from multiple TRPs can also be scheduled separately using multiple DCIs (multiple DCIs (M-DCI), multiple PDCCHs (multiplePDCCH)) (multiple-master mode). Multiple DCIs can also be sent separately from multiple TRPs. The UE can also be conceived of sending separate CSI reports (CSI reports) related to different TRPs. Such CSI feedback can also be referred to as separate feedback, separate CSI feedback, etc. In the present disclosure, "separate" and "independent" can also be rewritten as each other.

[0039] In addition, CSI feedback for sending CSI reports related to two TRPs for one TRP may also be used. Such CSI feedback may also be referred to as joint feedback, joint CSI feedback, etc.

[0040] For example, in the case of separate feedback, the UE is configured to use a certain PUCCH (PUCCH1) to send a CSI report for TRP#1 for TRP#1, and use another PUCCH (PUCCH2) to send a CSI report for TRP#2 for TRP#2. In the case of joint feedback, the UE sends a CSI report for TRP#1 and a CSI report for TRP#2 for TRP#1 or #2.

[0041] Based on such a multi-TRP scenario, more flexible transmission control using channels of good quality can be performed.

[0042] (CSI report or reporting)

[0043] In Rel.15NR, a terminal (also referred to as a user terminal, user equipment (UE), etc.) generates (also referred to as determining, calculating, estimating, measuring, etc.) channel state information (CSI) based on a reference signal (RS) (or resources used for the RS), and sends (also referred to as reporting, feedback, etc.) the generated CSI to a network (e.g., a base station). The CSI can also be sent to a base station using, for example, an uplink control channel (e.g., a physical uplink control channel (Physical Uplink Control Channel (PUCCH))) or an uplink shared channel (e.g., a physical uplink shared channel (Physical Uplink Shared Channel (PUSCH))).

[0044] The RS used in the generation of CSI may be, for example, at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Broadcast Channel (SynchronizationSignal / Physical Broadcast Channel) (SS / PBCH) block, a Synchronization Signal (SS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), etc.

[0045] The CSI-RS may also include at least one of a non-zero power (NZP) CSI-RS and a CSI-Interference Management (CSI-IM). The SS / PBCH block is a block including the SS and the PBCH (and the corresponding DMRS), and may also be referred to as an SS block (SSB), etc. In addition, the SS may also include at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

[0046] In addition, CSI may also include at least one of a channel quality indicator (Channel Quality Indicator (CQI)), a precoding matrix indicator (Precoding Matrix Indicator (PMI)), a CSI-RS resource indicator (CSI-RSResource Indicator (CRI)), a SS / PBCH block resource indicator (SS / PBCH Block Resource Indicator (SSBRI)), a layer indicator (Layer Indicator (LI)), a rank indicator (Rank Indicator (RI)), L1-RSRP (reference signal received power in layer 1 (layer 1 reference signal received power (Layer 1 Reference Signal Received Power))), L1-RSRQ (reference signal received quality (Reference Signal Received Quality)), L1-SINR (signal to interference plus noise ratio (Signal to Interference plus Noise Ratio)), L1-SNR (signal to noise ratio (Signal to Noise Ratio)), etc.

[0047] The UE may also receive information related to CSI reporting (report configuration information) and control CSI reporting based on the report configuration information. The report configuration information may also be, for example, "CSI-ReportConfig" of the information element (IE) of the Radio Resource Control (RRC). In addition, in the present disclosure, the RRC IE may also be mutually rewritten with RRC parameters, high-layer parameters, etc.

[0048] The report configuration information (eg, "CSI-ReportConfig" of RRC IE) may include, for example, at least one of the following.

[0049] Information related to the type of CSI report (report type information, for example, "reportConfigType" of RRC IE)

[0050] Information on one or more quantities (quantities) of CSI to be reported (one or more CSI parameters) (report quantity information, for example, "reportQuantity" of RRC IE)

[0051] Information on RS resources used in generating the quantity (the CSI parameter) (resource information, for example, "CSI-ResourceConfigId" of RRC IE)

[0052] Information related to the frequency domain that is the subject of CSI reporting (frequency domain information, for example, "reportFreqConfiguration" of RRC IE)

[0053] For example, the report type information may also represent (indicate) a periodic CSI (Periodic CSI (P-CSI)) report, an aperiodic CSI (Aperiodic CSI (A-CSI)) report, or a semi-permanent (semi-persistent, semi-persistent (Semi-Persistent)) CSI report (Semi-Persistent CSI (SP-CSI)) report.

[0054] In addition, the reporting amount information may also specify a combination of at least one of the above-mentioned CSI parameters (for example, CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0055] In addition, the resource information may be an ID of a resource for RS. The resource for RS may include, for example, a non-zero-power CSI-RS resource or SSB, and a CSI-IM resource (for example, a zero-power CSI-RS resource).

[0056] In addition, the frequency domain information can also represent the frequency granularity of the CSI report. The frequency granularity may also include, for example, a wideband and a subband. The wideband is the entire CSI reporting band (entire CSI reporting band). For example, the wideband may be the entirety of a certain (certain) carrier (component carrier (CC), cell, serving cell), or the entirety of the bandwidth part (Bandwidth part (BWP)) within a certain carrier. The wideband may also be referred to as the CSI reporting band, the entire CSI reporting band, etc.

[0057] In addition, a subband is a part of a wideband and may be composed of one or more resource blocks (Resource Block (RB) or Physical Resource Block (PRB)). The size of a subband may also be determined according to the size of a BWP (the number of PRBs).

[0058] The frequency domain information may also indicate which wideband or subband PMI is reported (the frequency domain information may also include, for example, the "pmi-FormatIndicator" of the RRC IE used to determine whether to report wideband PMI or subband PMI). The UE may also determine the frequency granularity of the CSI report (i.e., whether to report wideband PMI or subband PMI) based on at least one of the above-mentioned reporting amount information and the frequency domain information.

[0059] When wideband PMI reporting is configured (determined), one wideband PMI may be reported for the entire CSI reporting band. On the other hand, when subband PMI reporting is configured, a single wideband indication i1 may be reported for the entire CSI reporting band, and a subband indication i2 (e.g., a subband indication for each subband) may be reported for each of one or more subbands within the entire CSI report.

[0060] The UE performs channel estimation using the received RS and estimates a channel matrix H. The UE feeds back an index (PMI) determined based on the estimated channel matrix.

[0061] The PMI may also represent a precoder matrix (also referred to as a precoder for short) that the UE considers suitable for downlink (downlink (DL)) transmission to the UE. Each value of the PMI may also correspond to a precoder matrix. The set of PMI values ​​may also correspond to a set of different precoder matrices called a precoder codebook (also referred to as a codebook for short).

[0062] In the spatial domain, the CSI report may also include more than one type of CSI. For example, the CSI may also 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 may also be referred to as a single layer, and multiple beams may also be referred to as multiple beams. In addition, type 1 CSI may not assume multiple-user multiple input multiple output (MU-MIMO), and type 2 CSI may also assume multi-user MIMO.

[0063] 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 be specified for each.

[0064] In the present disclosure, type 1 and type I may be replaced by each other. In the present disclosure, type 2 and type II may be replaced by each other.

[0065] The uplink control information (UCI) type may also include at least one of a hybrid automatic repeat request acknowledgment (HARQ-ACK), a scheduling request (SR), and CSI. UCI may be carried by either the PUCCH or the PUSCH.

[0066] In Rel.15NR, UCI can include a CSI part for wideband PMI feedback. CSI report #n includes PMI wideband information when reported.

[0067] In Rel.15NR, 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 independently.

[0068] In Rel.15NR, the UE is configured with N (N≥1) report settings of CSI report settings and M (M≥1) resource settings of CSI resource settings through the higher layer. For example, the CSI report setting (CSI-ReportConfig) includes resource settings for channel measurement (resourcesForChannelMeasurement), CSI-IM resource settings for interference (csi-IM-ResourceForInterference), NZP-CSI-RS settings for interference (nzp-CSI-RS-ResourceForInterference), report quantity (reportQuantity), etc. The resource settings for channel measurement, the CSI-IM resource settings for interference, and the NZP-CSI-RS settings for interference are associated with the CSI resource settings (CSI-ResourceConfig, CSI-ResourceConfigId), respectively. The CSI resource setting includes a list of CSI-RS resource sets (csi-RS-ResourceSetList, for example, an NZP-CSI-RS resource set or a CSI-IM resource set).

[0069] In order to realize the premise (hypotheses) of more dynamic channel / interference for NCJT for both FR1 and FR2, the evaluation and regulation of CSI reports for transmission of multiple TRPs and at least one of multiple panels in DL are being studied.

[0070] (Codebook Setting)

[0071] The UE is configured with parameters related to the codebook (codebook configuration (CodebookConfig)) through higher layer signaling (RRC signaling). The codebook configuration is included in the CSI report configuration (CSI-ReportConfig) of the higher layer (RRC) parameters.

[0072] In the codebook setting, at least one codebook is selected from a plurality of codebooks including type 1 single panel (typeI-SinglePanel), type 1 multi-panel (typeI-MultiPanel), type 2 (typeII), and type 2 port selection (typeII-PortSelection).

[0073] The codebook parameters include parameters (Restriction) related to codebook subset restriction (CBSR). The CBSR setting is a bit that indicates which PMI reports are allowed ("1") and which PMI reports are not allowed ("0") for the precoder associated with the CBSR bit. One bit of the CBSR bitmap corresponds to one codebook index / antenna port.

[0074] (CSI report settings)

[0075] In addition to the codebook configuration (CodebookConfig), the CSI report configuration (CSI-ReportConfig) of Rel.16 also includes CSI-RS resources for channel measurement (resourcesForChannelMeasurement(CMR)), CSI-RS resources for interference measurement (csi-IM-ResourcesForInterference(ZP-IMR), nzp-CSI-RS-ResourcesForInterference(NZP-IMR)), etc. The parameters of CSI-ReportConfig other than codebookConfig-r16 are also included in the CSI report configuration of Rel.15.

[0076] In Rel.17, an enhanced CSI report setting (CSI-ReportConfig) for CSI measurement / reporting of multiple TRPs using NCJT is being studied. In this CSI report setting, two CMR groups corresponding to each of the two TRPs are set. The CMRs in the CMR group can also be used for measurements of at least one of the multiple TRPs and single TRPs using NCJT. The N CMR pairs of NCJT are set through RRC signaling. The UE can also be set through RRC signaling whether to use the CMR pair of CMRs for single TRP measurements.

[0077] For CSI reports associated with NCJT measurements of multiple TRPs / panels configured through a single CSI report configuration, support for at least one of the following options 1 and 2 is being studied.

[0078] <Option 1>

[0079] The UE is configured to report X (X=0, 1, 2) CSIs associated with single TRP measurement assumptions and one CSI associated with NCJT measurement. In the case of X=2, the two CSIs are associated with two different single TRP measurements using CMRs of different CMR groups.

[0080] <Option 2>

[0081] The UE may also be configured to report a CSI associated with the best measurement result for NCJT and single TRP measurement assumptions.

[0082] As described above, in Rel. 15 / 16, CBSR is configured for each codebook configuration of each CSI report configuration. That is, CBSR is applied to all CMRs and the like in the corresponding CSI report configuration.

[0083] However, in the CSI report configuration for multiple TRPs based on Rel.17 of the CSI report configuration, when the above-mentioned options 1 and 2 are applied, it is possible to perform the following measurement configuration.

[0084] Option 1 (X=0): Measurement of CSI of NCJT only.

[0085] Option 1 (X=1): Measurement of CSI of NCJT and CSI of a single TRP (one TRP).

[0086] Option 1 (X=2): Measurement of CSI of NCJT and CSI of a single TRP (two TRPs).

[0087] Option 2: Measurement of both NCJT’s CSI and single TRP’s CSI.

[0088] (Type 1 codebook)

[0089] For the base station panel, a type 1 single panel codebook and a type 1 multi-panel codebook are specified as the type 1 codebook (Rel. 15). In the type 1 single panel, for the number of CSI-RS antenna ports P CSI-RS and (N1, N2) define the antenna model of the CSI antenna port array (logical setting). In the type 1 multi-panel, for the number of CSI-RS antenna ports P CSI-RS and (N g ,N1,N2), specifies the antenna model of the CSI antenna port array (logical setting).

[0090] For Rel.15 type 1 single panel CSI, the UE sets the high-level parameter of the codebook type (subType in type1 in codebookType in CodebookConfig) to type 1 single panel ('typeI-SinglePanel'). In the case where the number of layers v∈{2,3,4} is not 1,1 ,i 1,2,i2. In the case of layer number v∈{2,3,4}, the PMI value corresponds to four codebook indexes i 1,1 ,i 1,2 ,i 1,3 ,i2. In the case where the number of layers v∈{2,3,4} is not the same, the composite codebook index i1=[i 1,1 ,i 1,2 In the case of the number of layers v∈{2,3,4}, the composite codebook index i1=[i 1,1 ,i 1,2 ,i 1,3 ].

[0091] For the number of CSI antenna ports P CSI-RS The specification specifies the supported settings (N1, N2) and (O1, O2) (value combinations). (N1, N2) represents the number of two-dimensional antenna elements, which is set by n1-n2 in moreThanTwo in nrOfAntennaPorts in typeI-SinglePanel. (O1, O2) is the two-dimensional oversampling factor. i corresponding to the horizontal beam 1,1 is {0,1,...,N1O1-1}. i corresponding to the vertical beam 1,2 is {0,1,...,N2O2-1}. i2 is {0,1,2,3}. For codebookMode = 1, antenna ports 3000 to 2999+P are used CSI-RS The matrix used in the 1-layer CSI report codebook is W_i 1,1 ,i 1,2 ,i2^(1). Here, W l,m,n (1) Provided by the following formula.

[0092]

[0093] For Rel.15 Type 1 multi-panel CSI, in addition to N1 and N2, the number of panels N is set compared to Type 1 single panel. g As inter-panel co-phasing, phase compensation between panels, phase adjustment / phase difference between panels, i was added, 1,4 For each panel, the same SD beam is selected (precoding matrix W l ), only the additional inter-panel phase matching is reported.

[0094] For the number of CSI antenna ports P CSI-RS, the specification specifies the supported (N g ,N1,N2) and (O1,O2) settings (combination of values). (N1,N2) are set by ng-n1-n2 in typeI-MultiPanel. 1,1 is {0,1,...,N1O1-1}. 1,2 is {0,1,...,N2O2-1}. For q=1,...,N g -1,i 1,4,q is {0,1,2,3}. i2 is {0,1,2,3}. For codebookMode = 1, use antenna ports 3000 to 2999+P CSI-RS The matrix used in the 1-layer CSI report codebook is W_i 1,1 ,i 1,2 ,i 1,4 ,i2^(1). Here, W l,m,p,n (1) =W l,m,p,n ^1,N g ,1.

[0095] For N g =W_l,m,p,n^1,N of {2,4} g ,1 and W_l,m,p,n^2,N g ,1(for the first layer, N g =2, codeBookMode = 1 l,m,p,n 1,2,1 , for the second layer, N g =2, codeBookMode = 1 l,m,p,n 2,2,1 , for the first layer, N g =4, codeBookMode = 1 l,m,p,n 1,4,1 , and for the second layer, N g =4, codeBookMode = 1 l,m,p,n 2,4,1 ) is provided by the following formula.

[0096]

[0097] here, For N g =2, p=p1, for N g =4, p=[p1,p2,p3]. represents inter-panel co-phasing. The same beam is selected for panels 0, 1, 2, and 3 (SD beam matrix, precoding matrix W l ), represents the phase compensation of panel 1 for panel 0, represents the phase compensation of panel 2 for panel 0, Represents the phase compensation of panel 3 for panel 0.

[0098] (Type 2 codebook)

[0099] In the present disclosure, a matrix Z having X rows and Y columns is sometimes expressed as Z(X×Y).

[0100] For the type 2 CSI of Rel.15 provided for layer k, the generation of the precoding vector (vector) per subband (SB-wise) is based on the following equation.

[0101] W k (N t × N3)=W1W 2,k (Y1)

[0102] N t is the number of ports. N3 is the total number of precoding matrices (precoders) (number of subbands) represented by PMI. t ×2L) is a matrix (SD beam matrix) composed of L∈{2,4} (oversampled) spatial domain (SD) two-dimensional (2D) DFT vectors (SD beams, 2D-DFT vectors). L is the number of beams. For example, L=2 SD 2D-DFT vectors are b i ,b j .W 2,k (2L×N3) is a matrix (LC coefficient matrix) composed of linear combination coefficients for layer k (linear combination (LC) coefficients, subband complex LC coefficients, combination coefficients). 2,k represents beam selection and phase matching (co-phasing) between two polarizations. 2,k They are c i ,c j For example, the channel matrix h is obtained by linear combination of L = 2 SD 2D-DFT vectors c i b i ,+c j b j The feedback overhead is mainly due to the LC coefficient matrix W 2,kIn addition, the type 2 CSI of Rel.15 only supports ranks 1 and 2.

[0103] In Type 2 CSI, the channel (channel matrix) for a certain user is represented by a linear combination of two polarizations and L beams (L 2D-DFT vectors). Type 2 CSI of Rel.15 supports ranks 1 and 2.

[0104] (Extension of Type 2 codebook)

[0105] The type 2 CSI (enhanced type 2 codebook) of Rel.16 reduces the W 2,k The associated overhead. In addition to rank 1 and 2, the type 2 CSI of Rel.16 also supports rank 3 and 4.

[0106] Regarding Rel.16 type 2 CSI, for the provided layer k, information based on the following formula may also be reported by the UE.

[0107] W k =W1W ～ k W f,k H (Y2)

[0108] W 2,k By W ～ k W f,k H To approximate. Matrix W ～ It can also be expressed by adding a ~ (wavy line) on W. ～ k It can also be expressed as W ～ 2,k Matrix W f,k H It is W f,k The adjoint matrix of .

[0109] For CSI reporting, the UE can also be configured with one of two subband sizes. The subband (CQI subband) can also be defined as N PRB SB The number of consecutive PRBs in the BWP can also depend on the total number of PRBs in the BWP. The number of PMI subbands R for each CQI subband is set by the RRC IE (numberOfPMI-SubbandsPerCQI-Subband). For R, the total number of precoding matrices N3 represented by the PMI is controlled as a function of the number of subbands set in the csi-ReportingBand, the subband size set by subbandSize, and the total number of PRBs in the BWP.

[0110] 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) vector and the two-dimensional oversampling factor are reported. The spatial domain response / distribution represented by the SD 2D-DFT vector can also be called an SD beam.

[0111] W ～ k (2L×M v ) is a matrix of LC coefficients. For this matrix, a maximum of K0 non-zero coefficients (non-zero coefficients (NZCs), LC coefficients of non-zero amplitude) are reported. The report consists of two parts: a bitmap that captures the NZC positions, and a quantized NZC.

[0112] W f,k (N3×M v ) is a matrix consisting of multiple frequency domain (FD) bases (vectors) for layer k. For each layer, there are M v FD basis (FD DFT basis). In the case of N3>19, select M from the intermediate subset (InS) of size N3' (<N3) v DFT. In the case of N3≤19, log2(C(N3-1,M v -1)) bits. Here, C(N3-1,M v -1) means select M from N3-1 v The number of combinations of -1 (combinatorial coefficient C(x,y)) is also called binomial coefficients. The response / distribution in the frequency domain (frequency response) represented by the linear combination of the FD basis vector and the LC coefficient can also be called an FD beam. The FD beam corresponds to the delay distribution (time response).

[0113] A subset of the FD basis is {f1,...,f Mv} and is provided. Here, f i is the i-th FD basis for the k-th (K=1,...,v) layer, i∈{1,...,M v}. The PMI subband size is provided by the CQI subband size / R, R∈{1,2}. The number of FD bases M for the provided rank vv By ceil(p v ×N3 / R) is provided. As for the number of FD bases, it is the same for all layers k∈{1,2,3,4}. v Set by high level.

[0114] Matrix W 2,k Each row of represents the channel frequency response of a specific SD beam. In the case where the SD beam has high directivity, the channel tap of each beam is limited (in the time domain, the power delay distribution becomes sparse). As a result, the channel frequency response of each SD beam has a high correlation (close to flat in the frequency domain). In this case, the channel frequency response can be approximated by a linear combination of a small number of FD bases. For example, in M v = 2, use the FD basis f2, f q and LC coefficient d1 0 ,d2 0 , the frequency response associated with SD beam b0 is transmitted through d1 0 f2+,d2 0 f q To approximate.

[0115] Select the highest gain M v FD basis. By setting M v <<N3,W ～ k The cost and W 2,k The overhead is quite small compared to M v All or part of the FD basis is used for an approximate representation of the frequency response of each SD beam. In order to report only the selected FD basis for each SD beam, a bitmap is used. In case the bitmap is not reported, all FD basis are selected for each SD beam. In this case, NZCs of all FD basis are reported for each SD beam. The maximum number of NZCs in one layer is K k NZ ≤K0=ceil(β×2LM v ), the maximum number of NZCs across all layers K NZ ≤2K0=ceil(β×2LM v ). β is set by the higher level.

[0116] W ～ k Each reported LC coefficient (complex coefficient) in is represented by its own quantized amplitude and phase.

[0117] [Amplitude Quantization]

[0118] The polarization-specific reference amplitude is obtained using Figure 1Table (amplitude coefficient indicator i 2,3,l The mapping of multiple elements of: element k l,p (1) To the amplitude coefficient p l,p (1) All other coefficients are quantized using Figure 2 Table (amplitude coefficient indicator i 2,4,l The mapping of multiple elements of: element k l,i,f (2) To the amplitude coefficient p l,i,f (2) 8-level quantization of the mapping).

[0119] [Phase Quantization]

[0120] All coefficients are quantized using 16-PSK. For example, Here, c l,i is the phase value after correlation Phase coefficient reported by the UE (using 4 bits).

[0121] Type 2 CSI feedback on PUSCH in Rel.16 consists of two parts. CSI Part 1 has a fixed payload size and is used to identify the number of information bits in CSI Part 2. Part 2 is of variable size (the UCI size depends on the number of NZCs, which is unknown to the base station). The UE reports the number of NZCs in CSI Part 1, which determines the size of CSI Part 2. After receiving CSI Part 1, the base station identifies the size of CSI Part 2.

[0122] In enhanced type 2 CSI feedback, CSI part 1 contains RI, CQI, and an indication of the total number of non-zero amplitudes (NZC) across multiple layers for enhanced type 2 CSI. The fields of part 1 are coded separately. CSI part 2 contains the PMI for enhanced type 2 CSI. Parts 1 and 2 are coded separately. CSI part 2 (PMI) contains the oversampling factor, the index of the 2D-DFT basis, the index of the initial DFT basis (starting offset) of the selected DFT window, and the PMI of the selected DFT window. initial , a selected DFT basis for each layer, the NZC (amplitude and phase) of each layer, a strongest coefficient indicator (SCI) for each layer, and at least one of the amplitude of the strongest coefficient for each layer / each polarization.

[0123] For the k-th layer, multiple PMI indices (PMI values, codebook indices) associated with different CSI part 2 information may also follow as follows.

[0124] ·i 1,1 : Oversampling factor

[0125] ·i 1,2 : Multiple indices of a 2D-DFT basis

[0126] ·i 1,5 : Index of the initial DFT basis (starting offset) of the selected DFT window M initial

[0127] ·i 1,6,k : The DFT basis selected for the kth layer

[0128] ·i 1,7,k : Bitmap for the kth layer

[0129] ·i 1,8,k : The strongest coefficient indicator (SCI) for the kth layer

[0130] ·i 2,3,k : The amplitude of the strongest coefficient (for both polarizations) of the kth layer

[0131] ·i 2,4,k : The amplitude of the reported coefficients of the kth layer

[0132] ·i 2,5,k : The phase of the reported coefficients of the kth layer

[0133] i 1,5 and 1,6,k is the PMI index used for DFT basis reporting. Only when N3>19, report i 1,5 .

[0134] As a grouping of CSI part 2, the PMI information is summarized into 3 groups (groups 0 to 2) for the provided CSI report. This is important in the case of CSI omission. Index i 2,4,l 、i 2,5,l 、i 1,7,l Each element reported is associated with a specific priority rule. Groups 0 to 2 follow the following.

[0135] Group 0: index i 1,1 、i 1,2 、i 1,8,l (l=1,...,v)

[0136] Group 1: Index i (when reported) 1,5 , index i (when reported) 1,6,l 、i1,7,l The highest v2LM in v -floor(K NZ / 2) priority elements, i 2,3,l 、i 2,4,l The highest ceil (K NZ / 2)-v priority elements, i 2,5,l The highest ceil (K NZ / 2)-v priority elements (l=1,...,v)

[0137] ·Group 2:i 1,7,l The lowest (lower) floor (K NZ / 2) priority elements, i 2,4,l The lowest (lower) floor (K NZ / 2) priority elements, i 2,5,l The lowest (lower) floor (K NZ / 2) priority elements (l=1,...,v)

[0138] In type 1 CSI, an SD beam represented by an SD DFT vector is transmitted to the UE. In type 2 CSI, L SD beams are linearly combined and transmitted to the UE. Each SD beam can be associated with multiple FD beams. For the corresponding SD beam, a channel frequency response can be obtained by linearly combining these FD basis vectors. The channel frequency response corresponds to the power delay profile.

[0139] (Type 2 port selection codebook / enhancement / further enhancement)

[0140] In the type 2 port selection (PS) CSI (type 2PS codebook) of Rel.15, the UE does not need to consider 2D-DFT to derive the SD beam as in type 2 CSI. The base station sends CSI-RS using K CSI-RS ports, which are beamformed considering the set of SD beams. The UE selects / identifies the optimal L (≤K) CSI-RS ports per polarization and reports their indices in W1. Type 2PS CSI of Rel.15 supports ranks 1 and 2.

[0141] The operation of the Type 2 PS CSI (enhanced Type 2 PS codebook) of Rel. 16 is the same as that of the Type 2 CSI of Rel. 16 except for the selection of the SD beam. The Type 2 PS CSI of Rel. 15 supports ranks 1 to 4.

[0142] For layer k∈{1,2,3,4}, the subband (SB)-wise precoder generation is given by the following equation.

[0143] W k (N t ×N3)=QW1W ～ k W f,k H (Y3)

[0144] Here, Q(N t W1(K×2L) is a block diagonal matrix. ～ k (2L×M) is the LC coefficient matrix. W f,k (N3×M) consists of N3 DFT basis vectors (FD basis vectors). K is set by higher layers. L is set by higher layers. P CSI-RS ∈{4,8,12,16,24,32}. CSI-RS >4, L∈{2,3,4}.

[0145] In the type 2 PS CSI of Rel.15 / 16, each CSI-RS port #i is associated with the SD beam (b i ) to associate ( Figure 3A as well as Figure 3B ).

[0146] For Rel.16 type 2PS CSI, the number of FD bases is reduced from N3 to M, similar to Rel.16 type 2CSI. v (M v <<N3), thereby reducing the overhead compared to the type 2 PS CSI of Rel.15.

[0147] In the CSI / codebook of type 2 port selection of Rel.17 (further enhanced type 2 port selection codebook), each CSI-RS port #i is used with an SD-FD beam pair (SD beam b) instead of an SD beam. i and FD beam f i,j (j is the frequency index)) to associate ( Figure 4A as well as Figure 4B ). In this example, ports 3 and 4 are associated with the same SD beam and with different FD beams.

[0148] The frequency selectivity of the channel frequency response observed in the UE based on the SD beam-FD beam pair can be reduced by pre-compensation of delay (delay pre-compensation) compared with the frequency selectivity of the channel frequency response observed in the UE based on the SD beam.

[0149] The main scenario for the type 2 port selection codebook of Rel.17 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 the UL frequency and the DL frequency is different). However, the base station is able to obtain / select several partial information (dominant angles and delays (SD beam and FD beam)). In addition to the CSI report, the SRS measurement in the base station is also used, so that the base station can obtain the CSI for determining the DL MIMO precoder. In this case, in order to reduce the CSI overhead, several CSI reports can also be omitted.

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

[0151] For the provided layer k, information based on the following formula may also be reported by the UE.

[0152] W k (K×N3)=W1W ～ k W f,k H (Y4)

[0153] For W1(K×2L), each matrix block consists of L columns of a K×K identity matrix. The base station sends K beamformed CSI-RS ports. In the Rel.16 type 2PS codebook, each port is associated with an SD beam. In contrast, in the Rel.16 type 2PS codebook, each port is associated with an SD-FD pair. The UE selects L ports out of K and uses them as the PMI (W 1,k ) is reported to the base station.

[0154] W ～ k (2L×M v) is a matrix consisting of LC coefficients (subband complex LC coefficients) vectors for layer k. A maximum of K0 NZCs are reported. The report consists of two parts: a bitmap that captures the NZC positions and a quantized NZC. In the type 2PS codebook of Rel.16, the bitmap of the NZC positions is always reported. In contrast, in the type 2PS codebook of Rel.17, the bitmap can be omitted for specific situations. The specific situation is the situation where the number of reported NZCs is equal to the maximum number K1*M*v (v≤2).

[0155] W f,k (N3×M v ) is for layer k by M v A matrix consisting of FD basis (FD DFT basis) vectors. v is 1 or 2. The base station can determine W f,k Whether to enable / disable (ON / OFF) f,k To enable (M v =2), report M v An additional FD basis. f,k To disable (M v =1, W f,k To disable the M v =1, W f,k is the same as enabled), the additional FD basis is not reported. v = 2, select / report M from the window size N (N is 2 or 4) set by RRC v FD basis. In Rel.16, W f,k Always reported.

[0156] (Rel.17NCJT CSI)

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

[0158] Rel.17 supports NCJT from two TRPs. PDSCHs from two TRPs can also be precoded and decoded independently. Frequency resources can be non-overlapping, partially overlapping, or fully overlapping. In the event of overlap, the PDSCH from one TRP becomes interference to the PDSCH from other TRPs.

[0159] For Rel.17 non-coherent joint transmission (NCJT) CSI, K s = Two CMR groups of K1+K2 CMRs are set to the UE. K1 and K2 are the number of CMRs in the two CMR groups. The higher layer sets N CMR pairs by selecting from all possible pairs. Supports N=1, K s =2. N max =2 is an optional function of UE. S,max = The support of X is an optional function of UE.

[0160] Support at least one of the following options 1 and 2.

[0161] [Option 1]

[0162] The UE may also be configured to report X CSIs associated with a single TRP measurement premise (hypothesis) and one CSI associated with an NCJT measurement premise. X = 0, 1, 2. In the case of X = 2, the two CSIs are associated with two different single TRP measurement premises with multiple CMRs from different multiple CMR groups. Support of X = 1, 2 is an optional feature of the UE for UEs supporting option 1.

[0163] [Option 2]

[0164] The UE may also be configured to report a CSI associated with the best one within the measurement conditions of NCJT and single TRP.

[0165] (CJT)

[0166] In Rel.18, support for CJT using up to 4 TRPs is being studied. Data from the 4 TRPs can also be coherently precoded and sent 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 that there is a certain relationship between the phases of multiple received signals. It is also possible to use joint precoding of 4 TRPs to improve signal quality, and there can be no interference between the 4 TRPs. The data can also be subject to interference only outside the 4 TRPs.

[0167] In an ideal situation (where 4 TRPs are co-located (considered to be at the same location)), a 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 a constant module codebook is not accurate. In this case, the feedback of each TRP and the coefficients between TRPs can be matched by the current NR type 2 codebook.

[0168] For CJT of up to 4 TRPs in FR1, the selection of the 4 TRPs can also be semi-static. Therefore, the 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 less likely.

[0169] The path losses from the four TRPs to the UE are different. Therefore, it is difficult to report only one aggregated CSI representing the joint channel matrix.

[0170] Considering the fallback operation to NCJT (ie, single TRP), also consider the CSI of each TRP (ie, single TRP CSI like NCJT CSI of Rel.17).

[0171] (CJT CSI)

[0172] Assuming ideal backhaul, synchronization, and the same number of antenna ports across multiple TRPs, we are studying CSI acquisition for coherent joint transmission (CJT) for FR1 and up to 4 TRPs. We are studying improvements to the Rel.16 / 17 type 2 codebook for CJT multi-TRPs for FDD.

[0173] As CSI enhancements for CJT, the following are being studied.

[0174] CMR and IMR for measurement of up to 4 TRPs.

[0175] ·CSI of each TRP along with inter-TRP CSI feedback for x-TRP CJT.

[0176] ·Inter-TRP CSI: New feedback and codebook for inter-TRP phase matrix / inter-TRP amplitude matrix / inter-TRP matrix (including both amplitude and phase).

[0177] · Ability to add reported x-TRP CJT CQI.

[0178] As a multi-TRP CJT CSI, the following are being studied.

[0179] ·Restrictions on the settings of CMR / CSI for each TRP.

[0180] ·CSI / PMI between TRPs (e.g., inter-TRP phase with / without inter-TRP amplitude).

[0181] [Option 1] Independent codebook and feedback based on Rel.16 / 17 Type 2 codebook.

[0182] [Option 2] With W k ～ W f,k H / In W k ～ W f,k H W2 of CSI / PMI between TRPs passed internally. Common / different FD substrates for multiple TRPs.

[0183] As a multi-panel type 2CSI for multi-TRP CJT, the following is being studied.

[0184] Enhancement of Rel.16 / 17 type 2 codebook and type 2 PS codebook to multiple panels.

[0185] • New antenna settings for type 2 multi-panel codebook.

[0186] W1(SD basis) / W for each TRP f (FD base) can be the same or different. k (NZC) can also be different. W1 / W for each TRP f / W k You can select them together or individually. f / W k Design, preferably for different scenarios with different options. It can be reported as a separate item or in W k The policies used are relevant to the deployment scenario (e.g., intra-site multiple TRPs or inter-site multiple TRPs).

[0187] For example, the precoding matrix for 4-TRP CJT CSI (codebook) can also be composed of W1 / W for each TRP. f / W k W1 for each TRP can be the same or different, and can be selected together or individually. k They can also be different, and can be selected together or individually. f They can be the same or different, and can be selected together or individually.

[0188] The type 2 codebook (codebook structure) used for CJT multi-TRP (mTRP) can be at least one of the following options, or a combination of several of the following options.

[0189] [Option 1A] (Codebook Structure 1A)

[0190] SD / FD basis selection for each TRP / each TRP group (port group or resource) + relative phase relationship (co-phasing) / amplitude relationship (co-amplitude) (including broadband and at least one of sub-bands).

[0191] For example, the codebook structure is provided by the following formula.

[0192]

[0193] Here, N is the number of TRPs or TRP groups. r is the amplitude relationship (co-amplitude). r is the phase relationship (co-phasing). The codebook contains α r =p r = 1 (no co-scaling) or α r =0 special case.

[0194] [Option 1B] (Codebook Structure 1B)

[0195] Joint SD / FD basis selection for each TRP / each TRP group (port group or resource) + relative phase relationship / amplitude relationship (including broadband and at least one of sub-band).

[0196] For example, the codebook structure is provided by the following formula.

[0197]

[0198] Here, N is the number of TRPs or TRP groups. r is the amplitude relationship (co-amplitude). r is the phase relationship (co-phasing). The codebook contains α r =p r = 1 (no co-scaling) or α r =0 special case.

[0199] [Option 2] (Codebook Structure 2)

[0200] SD basis selection per TRP / per TRP group (port group or resource) and joint FD basis selection (across N TRPs).

[0201] For example, the codebook structure is provided by the following formula.

[0202]

[0203] Here, N is the number of TRPs or TRP groups.

[0204] (Question #0)

[0205] The following two options are being studied for β (a parameter in paramCombination set by RRC) set by RRC to control the maximum number of NZCs for each layer and all layers.

[0206] [NZC parameter a] is β which is the same for all TRPs.

[0207] [NZC parameter b] β that varies for each TRP.

[0208] 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.

[0209] The maximum number of NZCs controls the upper limit of the PMI size that the UE can report. A larger K0 has better DL performance but has a larger UCI overhead.

[0210] Furthermore, the introduction of the following restriction settings is under study.

[0211] The maximum number of NZCs for each layer in all X TRPs within one CSI-ReportConfig.

[0212] The maximum number of NZCs for all layers in all X TRPs within one CSI-ReportConfig.

[0213] In the bitmap reported to represent NZC, a bitmap for each TRP is being studied.

[0214] However, the details of the restrictions / reporting against NZC are unclear.

[0215] Thus, the research on the setting, determination, and reporting related to CJT CSI is insufficient. If these researches are insufficient, there is a possibility that the communication throughput and communication quality may be reduced.

[0216] Therefore, the inventors of the present invention conceived a method of setting / determining / reporting related to CJT CSI.

[0217] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, each of the following embodiments (for example, each case) may be used alone or in combination of at least two.

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

[0219] In the present disclosure, activate, deactivate, indicate (or specify), select, configure, update, determine, etc. may also be mutually rewritten. In the present disclosure, support, control, controllable, operate, and operate may also be mutually rewritten.

[0220] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, high-layer parameters, information elements (IE), settings, etc. can also be overwritten with each other. In the present disclosure, Medium Access Control (MAC) control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc. can also be overwritten with each other.

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

[0222] In the present disclosure, MAC signaling may also use, for example, MAC Control Element (MACCE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0223] In the present disclosure, the physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI)), etc.

[0224] In the present disclosure, index, identifier (ID), indicator, resource ID, etc. may also be mutually overwritten. In the present disclosure, sequence, list, set, group, cluster, subset, etc. may also be mutually overwritten.

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

[0226] In the present disclosure, “having the ability to…” and “the ability to support / report…” may also be rephrased with each other.

[0227] In the present disclosure, the panel, base station (gNB) panel, and TRP can also be rewritten mutually.

[0228] In the present disclosure, network (NW), base station, gNB, and TRP can also be rewritten mutually.

[0229] In the present disclosure, time domain resource configuration (time domain resource allocation) and time domain resource assignment may also be overwritten with each other.

[0230] In the present disclosure, beam, SD beam, SD vector, and SD 2D-DFT vector may be replaced with each other. L, 2L, the number of SD beams, the number of beams, and the number of SD 2D-DFT vectors may also be replaced with each other.

[0231] In the present disclosure, FD substrate, FD DFT substrate, DFT substrate, f i In the present disclosure, FD beam, FD vector, FD basis vector, FD DFT basis vector, and DFT basis vector may also be replaced with each other.

[0232] In the present disclosure, coefficients, LC coefficients, combination (combination) coefficients, sub-band complex LC coefficients, combination coefficient matrix, amplitude and phase, amplitude coefficient and phase coefficient can also be rewritten with each other. In the present disclosure, NZC, non-zero coefficients, non-zero LC coefficients, non-zero amplitude coefficients, and complex coefficients can also be rewritten with each other.

[0233] In the present disclosure, co-phasing, phase matching, phase compensation, phase adjustment, phase difference, and phase relationship may also be replaced by each other. In the present disclosure, co-amplitude, amplitude compensation, amplitude adjustment, amplitude ratio, and amplitude relationship may also be replaced by each other. In the present disclosure, difference, ratio, and relative value may also be replaced by each other.

[0234] In the present disclosure, layer k and layer l may also be replaced with each other.

[0235] In the present disclosure, size and length can also be replaced with each other.

[0236] In the present disclosure, TRP, transmission point, TCI status, and reference signal can also be rewritten with each other.

[0237] (Wireless Communication Method)

[0238] In each embodiment, TRP, CMR, CMR group, CRI, and CRI group may also overwrite each other.

[0239] In each embodiment, X TRPs, X-TRPs, X panels, and Ng panels may be replaced with each other. In each embodiment, CJTs using X TRPs, CJTs using X panels, and X-TRP CJTs may be replaced with each other.

[0240] In various embodiments, the reference CSI, the CSI for the reference TRP, and the first reported CSI may also override each other. In various embodiments, the reference TRP, the CSI corresponding to the reference CSI, the TRP corresponding to the first reported CSI, and the CSI-RS resource / CMR / CMR group / CSI-RS resource set corresponding to the first reported CSI may also override each other. In various embodiments, the TRP, CSI-RS resource, CMR, CMR group, and CSI-RS resource set may also override each other.

[0241] In each embodiment, multiple TRPs, multiple panels, intra-site multiple TRPs, and inter-site multiple TRPs can also rewrite each other.

[0242] In each embodiment, inter-TRP, inter-panel, inter-TRP difference, and inter-TRP comparison can also be rewritten.

[0243] In various embodiments, the CSI between TRPs, the CJT CSI between TRPs, the CSI between panels, the CSI of other TRPs relative to the CSI of the reference TRP, and the CSI of other TRPs relative to the CSI of the reference panel may also overwrite each other. In various embodiments, the CSI of each TRP (per-TRP) and the CSI of each panel (per-panel) may also overwrite each other.

[0244] In various embodiments, the inter-TRP phase index and the inter-TRP phase matching (phasing) index may also be overwritten with each other. In various embodiments, the inter-TRP index and the inter-TRP coefficient index may also be overwritten with each other. In various embodiments, the inter-TRP phase matrix and the inter-TRP phase matching (phasing) matrix may also be overwritten with each other. In various embodiments, the inter-TRP matrix and the inter-TRP coefficient matrix may also be overwritten with each other. In various embodiments, the inter-TRP phase codebook and the inter-TRP phase matching (phasing) codebook may also be overwritten with each other. In various embodiments, the inter-TRP codebook and the inter-TRP coefficient codebook may also be overwritten with each other.

[0245] In each embodiment, the object resource, CMR, CSI-RS resource, NZP-CSI-RS resource, CMR group, CSI-RS resource set, NZP-CSI-RS resource set, and TRP may also be overwritten with each other.

[0246] In each embodiment, the TRP codebook, multiple panel codebooks for type 2 codebooks, and the panel codebooks can also be rewritten with each other.

[0247] In various embodiments, the FD basis vector size, the FD basis number, M v Size, M v 、M v,i They can also rewrite each other.

[0248] In each embodiment, multiple TRPs / multiple CMRs are co-located, and multiple TRPs within a site can also overwrite each other.

[0249] In various embodiments, the report / content of CSI may be applied to both subband report and wideband report.

[0250] In the example of CSI in the figure of each embodiment, the CSI for X TRPs may also include the CSI from the first TRP to the CSI of the X-th TRP. The CSI of the i-th TRP in the figure of each embodiment is obtained by 2L i Line (SD beam) and M i The number / position of NZCs is represented by a matrix of columns (FD basis). i It may be a value M common to X TRPs or a value unique to each TRP.

[0251] <Implementation method #0-1>

[0252] This embodiment relates to the NZC parameters for problem #0.

[0253] The UE may also receive one or more parameters (NZC parameters, e.g., β) for multiple TRPs used for CJT. The UE may also determine the maximum number of NZCs for the multiple TRPs based on the one or more parameters.

[0254] 《NZC parameter 1》

[0255] It is also possible to set β for all TRPs.

[0256] 《NZC Parameter 2》

[0257] It is also possible to set a different β for each TRP.

[0258] There may also be at least one of the following restrictions.

[0259] · According to the β (β i ) can also follow the descending or ascending order of TRP index i (β1≥β2≥β3≥β4 or β4≥β3≥β2≥β1).

[0260] The maximum number of NZCs (K) for each layer of each TRP or for all layers of each TRP can also be confirmed by setting β for each TRP. 0,i ) follows the descending or ascending order of TRP index i (K 0,1 ≥K 0,2 ≥K 0,3 ≥K 0,4 or K 0,4 ≥K 0,3 ≥K 0,2 ≥K 0,1 ).

[0261] The maximum number of NZCs (K) for each layer of each TRP or for all layers of each TRP can also be confirmed by setting β for each TRP. 0,i )For each TRP the same (K 0,1 =K 0,2 =K 0,3 =K 0,4 ).

[0262] 《NZC parameter 3》

[0263] The β for one or more TRPs in a certain CMR group may be different from the β for one or more TRPs in a different CMR group.

[0264] There may also be at least one of the following restrictions.

[0265] ·The β set for each CMR / TRP group may also follow the descending or ascending order of the group index.

[0266] ·It can also be confirmed that the β set for each CMR / TRP group follows the descending or ascending order of the group index for each layer of each group or for all layers of each group.

[0267] · It can be confirmed that the β set for each CMR / TRP group is the same for each group, either for each layer of each group or for all layers of each group.

[0268] For Y TRPs in a group, if the SD beam of each TRP is different, K0 can also be K0 = Σ i＝ 1 Y K 0,i For Y TRPs in a group, when the SD beams of each TRP are the same, K0=K 0,1 =... =K 0,Y .

[0269] Furthermore, at least one of the following restrictive settings (depending on UE capabilities) may be introduced.

[0270] The maximum number of NZCs for each layer for each group of CMR / TRP in CSI-ReportConfig.

[0271] • The maximum number of NZCs for all layers as follows, where the all layers are all layers for the group of CMR / TRP in the CSI-ReportConfig.

[0272] The use of NZC parameters 1 / 2 / 3 may be specified in the specification or set by RRC IE. This signaling may also exist for each CMR / each CMR group / each CSI-ReportConfig.

[0273] The UE can confirm that the reported actual number of NZCs follows the descending order for the reported CRIs. For example, in the case where CMR#2 is reported as the strongest point like the first reported CRI, TRP#2 can also be reported with the largest actual number of NZCs. For example, in the case where CMR#3 is reported as the weakest point like the last reported CRI, TRP#3 can also be reported with the smallest actual number of NZCs.

[0274] According to this embodiment, the UE is able to appropriately decide / report the NZC for CJT CSI.

[0275] <Implementation method #0-2>

[0276] This embodiment concerns the bitmap of the NZC for question #0.

[0277] "Bit Figure 1 》

[0278] It is also possible to report a bitmap per TRP. In Rel.16 type 2 codebook, each bitmap has a size of 2LM. In Rel.17 type 2 port selection codebook, each bitmap has a size of K1M. It is also possible to report X separate bitmaps.

[0279] "Bit Figure 2 》

[0280] It is also possible to report a bitmap (joint bitmap) for all TRPs (X TRPs). The size of the joint bitmap can be either Σ i＝1 X 2L i M i , or Σ i＝1 X K 1,i Mi .

[0281] Bitmap 3

[0282] A bitmap for each CMR / TRP group may also be reported. In the case where the SD beam is different for each TRP, the number of bits in the bitmap for Y TRPs in a group may be either Σ i＝1 Y 2L i M i , or Σ i＝1 Y K 1,i M i When 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 .

[0283] exist Figure 5 In the example, the first CMR group is associated with the CSI of the first TRP and the CSI of the second TRP. The same N=M is ​​used in the CSI of the first TRP and the CSI of the second TRP. v 1 = 4 FD bases. In the first CMR group, different SD beams are used in the first TRP and the second TRP. 2L1 SD beams are used for the first TRP and 2L2 SD beams are used for the second TRP. The number of bits in the bitmap for the first CMR group can also be 2L1M v 1 +2L2M v 1 .

[0284] exist Figure 6 In the 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. In the first CMR group, the same 2L was used in the first TRP and the second TRP. 1 SD beams. The number of bits in the bitmap for the first CMR group can also be 2L 1 M v 1 .

[0285] Use bits Figure 1 / 2 / 3 can be specified in the specification or set by RRC IE.

[0286] According to this embodiment, the UE can appropriately decide / report the bitmap of NZC used for CJT CSI.

[0287] <Question #1>

[0288] In implementation #0-1, interpretation #1 (NZC parameter 1) of "same β for all TRPs" (NZC parameter a) is to set the same β for each TRP and consider the maximum number of NZCs for each layer or all layers for each TRP. For example, in the case of β=1 / 2, for each TRP, a maximum of 50% of the number of NZCs can be reported for one layer per TRP.

[0289] exist Figure 7 In the example, the number of FD bases M for 4 TRPs is i The common value M=4, the number of SD beams for the first TRP is 2L1=8, and the number of SD beams for other TRPs is 2L2=2L3=2L4=4. Therefore, the number of coefficients for the first TRP on a layer is 2L1*M=32, and the number of coefficients for other TRPs on the layer is 2L2*M=2L3*M=2L4*M=16. In this example, the number of FD bases M i It is a common value for X TRPs, but may be a separate value for each TRP.

[0290] β=1 / 2 limits the maximum number of NZCs to be reported for each TRP. The number of NZCs actually reported can also be less than the maximum number of NZCs, but in this example, the number of NZCs actually reported is the maximum number of NZCs. In this example, the maximum number of NZCs for the first TRP on a layer is 32*1 / 2=16, and the maximum number of NZCs for other TRPs on the layer is 16*1 / 2=8.

[0291] The embodiments mainly show an example of CJT enhancement based on the enhanced type 2 codebook (Rel. 16), but can be applied to CJT enhancement based on the enhanced type 2 port selection codebook (Rel. 17).

[0292] However, if the aforementioned codebook structure 2 of the CJT CSI is considered, W2 is selected jointly for all TRPs. In this case, "the same (common) β for all TRPs" may have other interpretations.

[0293] <Implementation method #1>

[0294] This implementation addresses problem #1.

[0295] Interpretation #2 of "same β for all TRPs" (NZC parameter a) can also be to apply a set β to all TRPs to limit the total number of NZCs for all TRPs. Regardless of the maximum number of NZCs per TRP, a set β can also be applied to all TRPs.

[0296] It is also possible to consider a maximum number for the total number of NZCs for each layer with respect to all TRPs (independent of the limits of each TRP).

[0297] A maximum number for the total number of NZCs for all layers with respect to all TRPs (independent of the limits of each TRP) may also be considered.

[0298] [analyze]

[0299] Compared with interpretation #1, even when several strong NZCs are obtained from a certain TRP, the UE can select / report a strong NZC more flexibly.

[0300] UE capabilities indicating support for this implementation may also be imported.

[0301] exist Figure 8 In the example, the number of TRPs, the number of beams, the number of FD bases, and the number of coefficients are Figure 7 That is, the total number of coefficients for all TRPs on one layer is Σ i＝1 X 2L i M i =32+16+16+16=80. In this example, β=1 / 2, and the maximum value βΣ of the total number of NZCs for all TRPs on one layer i＝1 X 2L i M i = 1 / 4 * 80 = 20. In this example, the NZC of one TRP (eg, the first TRP) may also exceed 2βL i M i The total number of NZCs from 4 TRPs (X=4) for one layer follows βΣ i＝1 X 2L i M i The limit (maximum number / maximum value).

[0302] [change]

[0303] NW can also be set by RRC using either interpretation #1 or #2 of β.

[0304] "change"

[0305] A combination of explanations #1 and #2 can also be applied.

[0306] The maximum number of NZCs per layer for all TRPs can also be set by RRC. all (Explanation #2) Further, the RRC may also set a β for limiting the maximum number of NZCs per layer for each TRP. per (Explanation #1). It can also be β per ≥β all There may also be two limits on the maximum number of NZCs for all layers. One limit may be a limit for all TRPs, and the other limit may be a limit for each TRP.

[0307] [analyze]

[0308] In this case, even if the actual NZC amount obtained from a certain TRP exceeds β all * In the case of 2LM, this number should also be less than β per *2LM.

[0309] exist Fig. 9 In the example, the number of TRPs, the number of beams, the number of FD bases, and the number of coefficients are Figure 7 In this example, β all =1 / 4,β per = 1 / 2. The maximum number of NZCs for all TRPs on one layer is βΣ i＝ 1 X 2L i M i = 20. In this example, the maximum number of NZCs for the first TRP on a layer is 32*1 / 2=16, and the maximum number of NZCs for other TRPs on the layer is 16*1 / 2=8.

[0310] According to this embodiment, the UE can appropriately determine the number of NZCs to be reported.

[0311] <Question #2>

[0312] In the (Rel.16) enhanced type 2 codebook or the (Rel.17) enhanced type 2 port selection codebook, a bitmap is used to indicate the NZC in W2. In the bitmap, there is at least one '1'.

[0313] In CJT CSI after Rel. 18, if the aforementioned CJT CSI codebook structure 2 is considered, W2 is selected jointly for multiple TRPs. In the bitmap for NZC, it is unclear whether it is allowed for a certain TRP not to select / report any NZC.

[0314] <Implementation method #2>

[0315] This embodiment relates to problem #2. The UE may also follow any of the following options.

[0316] Option 1

[0317] It is not allowed not to select / report NZC for a TRP. At least one NZC is selected / reported for each TRP. The minimum number of NZCs selected / reported for a TRP may also be 1.

[0318] In the bitmap indicating NZC for each TRP, at least one '1' may exist. The signaling may be a separate bitmap for each TRP or a combined bitmap for multiple TRPs.

[0319] Option 2

[0320] It is allowed that no NZC is selected / reported for a TRP. The minimum number of NZCs selected / reported for a TRP may also be 0.

[0321] exist Fig.10 as well as Fig.11 In the example, the number of TRPs, the number of beams, the number of FD bases, and the number of coefficients are Figure 7 The same example. Fig.10 In the example of , using interpretation #1 and β=1 / 2, NZC is not selected / reported in the fourth TRP CSI. Fig.11 In the example, using interpretation #2 and β=1 / 4, NZC is not selected / reported in the third TRP CSI. In option 1, it is also possible to not allow Fig.10 as well as Fig.11 In option 2, you can also allow Fig.10 as well as Fig.11 at least one example of .

[0322] It is also possible to allow special cases where all NZCs are selected / reported from one and the same TRP.

[0323] When no NZC is selected / reported for a TRP, the bitmap representing the NZC for the TRP may be omitted in the report, thereby reducing the reporting overhead.

[0324] Regarding which TRP bitmap to omit, in order to ensure that the UE and the base station have a common understanding, the UE / base station may also follow at least one of the following options.

[0325] [Option 2-1]

[0326] In the fixed-size CSI part 1, the actual (reported) number of NZCs for each TRP is reported. For example, in the case of reporting [8,2,3,0] as the number of NZCs for 4 TRPs, in the variable-size CSI part 2, the bitmap and NZC for the fourth TRP may not exist.

[0327] [Option 2-2]

[0328] In CSI part 1 of fixed size, the total number of actual (reported) NZCs for all TRPs is reported. One or more additional bits (bitmaps) may also be used to indicate whether each TRP has NZC. For example, in the case of reporting 13 as the total number of NZCs, an additional bitmap 1110 may also be used to indicate whether each TRP has NZC. The value '0' therein may also mean that the fourth TRP does not have NZC. Bit position i within the bitmap may also correspond to the i-th TRP.

[0329] It is also possible to import UE capabilities related to supporting the omission of the TRP-specific NZC bitmap. For example, the report using option 2 is configured only when the aforementioned CJT CSI codebook structure 2 is supported and the corresponding UE capabilities are reported.

[0330] It is also possible to support / import RRC settings representing either option 1 or 2 of this implementation.

[0331] The maximum number of TRPs to which the omission of the bitmap can be applied may also be limited. For example, the reporting of the bitmap / NAC for at most one TRP may also be omitted.

[0332] According to this embodiment, the UE is able to appropriately report the NZC for each TRP.

[0333] <Supplement>

[0334] In various embodiments, β / β all / β per The examples where the value of β / β is 1 / 2 or 1 / 4 are described, but all / β per The value of is not limited to this. all / β per The value of can also be greater than 0 and less than 1.

[0335] [Notification of information to UE]

[0336] The notification of any information from the network (Network (NW)) (for example, from the base station (Base Station (BS))) to the UE (in other words, the reception of any information from the BS in the UE) in the above-mentioned implementation manner can also be carried out using physical layer signaling (for example, DCI), high-layer signaling (for example, RRC signaling, MAC CE), specific signals / channels (for example, PDCCH, PDSCH, reference signals) or a combination thereof.

[0337] When the above notification is performed through MAC CE, the MAC CE can also be identified by including a new logical channel ID (Logical Channel ID (LCID)) not specified in the existing standards in the MAC subheader.

[0338] In the case where the above notification is made through DCI, the above notification can also be made through a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used in scrambling the Cyclic Redundancy Check (CRC) bits assigned in the DCI, the format of the DCI, etc.

[0339] In addition, the notification of arbitrary information to the UE in the above-mentioned embodiments may be performed periodically, semi-continuously, or aperiodically.

[0340] [Notification of information from UE]

[0341] The notification of arbitrary information from the UE (to the NW) in the above-mentioned implementation manner (in other words, the sending / reporting of arbitrary information from the UE to the BS) may also be performed using physical layer signaling (e.g., UCI), high-layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0342] In the case where the above notification is performed through MAC CE, the MAC CE can also be identified by including a new LCID that is not specified in the existing standards in the MAC subheader.

[0343] When the notification is performed through UCI, the notification may be sent using PUCCH or PUSCH.

[0344] In addition, the notification of arbitrary information from the UE in the above-mentioned embodiments may be performed periodically, semi-continuously, or aperiodically.

[0345] [About application of each embodiment]

[0346] At least one of the above-mentioned embodiments may also be applied when a specific condition is met. The specific condition may be specified in the standard or notified to the UE / BS using high-layer signaling / physical layer signaling.

[0347] At least one of the above-mentioned implementation modes may also be applied only to UEs that report a specific UE capability or support the specific UE capability.

[0348] The specific UE capability may also represent at least one of the following:

[0349] The maximum number of NZCs for each layer for each group of CMR / TRP in CSI-ReportConfig.

[0350] • The maximum number of NZCs for all layers as follows, where the all layers are all layers for the group of CMR / TRP in the CSI-ReportConfig.

[0351] Support for setting a limit on the total number of NZCs for all TRPs.

[0352] · The amount of NZC for TRP is 0 support.

[0353] Omit support for NZC bitmaps for TRPs.

[0354] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied throughout all frequencies (commonly regardless of frequency), or capabilities for each frequency (for example, one or a combination of cells, bands, band combinations, BWPs, component carriers, etc.), or capabilities for each frequency range (for example, frequency range 1 (Frequency Range 1 (FR1)), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities for each subcarrier spacing (SubCarrier Spacing (SCS)), or capabilities for each feature set (Feature Set (FS)) or feature set per component carrier (FeatureSet Per Component-carrier (FSPC)).

[0355] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied to all duplex modes (commonly regardless of the duplex mode) or capabilities for each duplex mode (for example, time division duplex (TDD) and frequency division duplex (FDD)).

[0356] In addition, at least one of the above-mentioned embodiments may also be applied when the UE is set / activated / triggered with specific information associated with the above-mentioned embodiments (or the operation of the above-mentioned embodiments is implemented) through high-layer signaling / physical layer signaling. For example, the specific information may also be information indicating activation of the functions of each embodiment, any RRC parameter for a specific version (e.g., Rel.18 / 19), etc.

[0357] The UE may also apply the operations of Rel.15 / 16, for example, when it does not support at least one of the above-mentioned specific UE capabilities or is not configured with the above-mentioned specific information.

[0358] (Note)

[0359] The following inventions are added to one embodiment of the present disclosure.

[0360] [Note 1]

[0361] A terminal having:

[0362] A receiving unit, receiving settings of channel state information for multiple transmission points; and

[0363] The control unit determines the number of non-zero coefficients for each transmission point based on at least one of the minimum number and the maximum number of non-zero coefficients.

[0364] [Note 2]

[0365] A terminal as described in Appendix 1, wherein:

[0366] The setting includes a parameter for determining a maximum value of the total number of all non-zero coefficients for the plurality of transmission points,

[0367] The control unit determines the number of non-zero coefficients for each transmission point based on the parameter.

[0368] [Note 3]

[0369] A terminal as described in Supplement 1 or Supplement 2, wherein:

[0370] The setting includes: a first parameter for determining a maximum value of the total number of all non-zero coefficients for the plurality of transmission points; and a second parameter for determining a maximum number of non-zero coefficients for each transmission point.

[0371] The control unit determines the number of non-zero coefficients for each transmission point based on the first parameter and the second parameter.

[0372] [Note 4]

[0373] A terminal as described in any one of Notes 1 to 3, wherein:

[0374] The number of non-zero coefficients for at least one of the plurality of transmission points is zero.

[0375] (Wireless Communication System)

[0376] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0377] Fig.12 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 (may also be simply referred to as system 1) may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5GNR), and the like.

[0378] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0379] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (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.

[0380] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0381] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in 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 in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0382] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0383] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the 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 below 6 GHz (lower than 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (higher than 24 GHz (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0384] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0385] Multiple base stations 10 may also be connected via wired (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0386] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0387] The core network 30 may also include, for example, user plane functions (User Plane Function (UPF)), access and mobility management function (Access and Mobility management Function (AMF)), session management function (Session Management Function (SMF)), unified data management (Unified Data Management (UDM)), application function (Application Function (AF)), data network (Data Network (DN)), location management function (Location Management Function (LMF)), maintenance and operation management (Operation, Administration and Maintenance (Management) (OAM))) and other network functions (Network Functions (NF)). In addition, multiple functions may be provided by one network node. In addition, communication with an external network (for example, the Internet) may also be carried out via the DN.

[0388] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0389] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may 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. may be used.

[0390] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0391] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)) and the like may be used.

[0392] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like may be used as uplink channels.

[0393] The PDSCH transmits user data, high-layer control information, system information block (SIB), etc. The PUSCH transmits user data, high-layer control information, etc. In addition, the PBCH transmits the master information block (MIB).

[0394] The PDCCH may also transmit lower layer control information. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0395] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0396] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0397] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may 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" and the like in the present disclosure may also be rewritten mutually.

[0398] Through PUCCH, uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.) and scheduling request (SR) can also be transmitted. Through PRACH, random access preambles for establishing a connection with a cell can also be transmitted.

[0399] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0400] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, 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. may also be transmitted as DL-RS.

[0401] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0402] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0403] (Base Station)

[0404] Fig.131 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0405] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0406] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0407] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0408] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring 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 measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0409] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0410] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0411] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0412] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0413] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0414] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0415] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0416] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0417] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0418] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0419] The transmission path interface 140 can also send and receive signals (return signaling) between the devices included in the core network 30 (for example, the network node providing NF), other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0420] 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 and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0421] The transmitting and receiving unit 120 may also transmit the configuration of the channel state information for multiple transmission points. The control unit 110 may also control the reception of the report indicating the number of non-zero coefficients for each transmission point based on at least one of the minimum number and the maximum number of non-zero coefficients.

[0422] (User Terminal)

[0423] Fig.14 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided with one or more.

[0424] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0425] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0426] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0427] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0428] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0429] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0430] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0431] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0432] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0433] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0434] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0435] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0436] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0437] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0438] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0439] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0440] The transmitting and receiving unit 220 may also receive settings of channel state information (e.g., CSI, PMI) for multiple transmission points (e.g., TRP). The control unit 210 may also determine the number of non-zero coefficients for each transmission point based on at least one of the minimum number and the maximum number of non-zero coefficients (NZC).

[0441] The setting may also include a parameter for determining a maximum value of the total number of all non-zero coefficients for the multiple transmission points, and the control unit 210 may also determine the number of non-zero coefficients for each transmission point based on the parameter.

[0442] The setting may also include: a first parameter for determining the maximum total number of all non-zero coefficients for the multiple sending points; and a second parameter for determining the maximum number of non-zero coefficients for each sending point. The control unit 210 may also determine the number of non-zero coefficients for each sending point based on the first parameter and the second parameter.

[0443] The number of non-zero coefficients for at least one of the plurality of transmission points may also be zero.

[0444] (Hardware Structure)

[0445] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. 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 can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0446] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0447] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.15 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0448] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be interchangeably used. 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 to exclude some of the devices.

[0449] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0450] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0451] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0452] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0453] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other 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 executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0454] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0455] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (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-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0456] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0457] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0458] 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), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0459] (Variation Example)

[0460] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be rewritten with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0461] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless 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) that is not dependent on a parameter set (numerology).

[0462] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filtering process performed by a transmitter and receiver in the frequency domain, a specific windowing process performed by a transmitter and receiver in the time domain, and the like.

[0463] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, 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 a parameter set.

[0464] A time slot may also include multiple 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 fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as 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.

[0465] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be replaced with each other.

[0466] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0467] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0468] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0469] In addition, when a time slot or a mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0470] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0471] In addition, a long TTI (e.g., normal TTI, subframe, etc.) can also be rewritten as a TTI with a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) can also be rewritten as a TTI with a TTI length shorter than that of the long TTI and longer than 1 ms.

[0472] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers (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, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0473] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0474] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0475] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0476] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0477] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0478] At least one of the set BWPs may be activated, and the UE may not assume that it will transmit or receive a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0479] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. 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 number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0480] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0481] In the present disclosure, the names used for parameters, etc. are not restrictive in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not restrictive in all respects.

[0482] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0483] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0484] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0485] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-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.

[0486] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0487] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0488] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0489] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0490] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0491] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0492] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "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", and "panel" can be used interchangeably.

[0493] In the present disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0494] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall 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 (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0495] In the present disclosure, the base station sending information to the terminal may also be rewritten with the base station instructing the terminal to control / operate based on the information.

[0496] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0497] There are also cases where a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client or several other appropriate terms.

[0498] At least one of the base station and the mobile station may also be referred to as a transmission device, a reception device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a moving object, a moving object body, etc.

[0499] The mobile body refers to a movable object, and the moving speed is arbitrary, and of course it also includes the situation where the mobile body stops. The mobile body includes, for example, vehicles, transport vehicles, cars, automatic two-wheeled vehicles (motorcycles), bicycles, connected cars, loading shovels, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, trolleys, rickshaws, ships (ships and other watercrafts), airplanes, rockets, artificial satellites, drones, multi-rotor aircraft, quadcopters, balloons and objects carried on them, but are not limited to these. In addition, the mobile body can also be a mobile body that drives autonomously based on operating instructions.

[0500] The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0501] Fig.161 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0502] The driving unit 41 is composed of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is composed of at least a steering wheel (also called a handlebar), and performs steering of 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.

[0503] 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 (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an ECU (Electronic Control Unit).

[0504] The signals from the various sensors 50-58 include a current signal from a current sensor 50 for sensing the current of the motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by a speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58, and the like.

[0505] The information service unit 59 is composed of various devices such as a vehicle navigation system, an audio system, a speaker, a display, a television, and a radio for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information obtained from an external device via the communication module 60, etc. to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0506] The information service unit 59 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0507] The driving assistance system unit 64 is composed of various devices for providing functions for preventing accidents before they happen or reducing the driver's driving load, such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning device (for example, Global Navigation Satellite System (GNSS)), map information (for example, high-precision (High Definition (HD))) map, autonomous vehicle (Autonomous Vehicle (AV)) map, etc.), gyroscope system (for example, inertial measurement unit (Inertial Measurement Unit (IMU))), inertial navigation unit (Inertial Navigation System (INS))), artificial intelligence (Artificial Intelligence (AI)) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 and realizes driving assistance function or autonomous driving function.

[0508] The communication module 60 can communicate with the microprocessor 61 and the components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between 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 microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58 of the vehicle 40 via the communication port 63.

[0509] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device that can communicate with an external device. For example, various information is sent and received between external devices via wireless communication. The communication module 60 can be located either 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 (it can also function as at least one of the base station 10 and user terminal 20).

[0510] The communication module 60 may also transmit at least one of the signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted through the communication module 60 may also include information based on the above input.

[0511] The communication module 60 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) transmitted from an external device, and displays it to the information service unit 59 provided in the vehicle. The information service unit 59 may also be referred to as an output unit for outputting information (for example, outputting information to a display, a speaker, etc. based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0512] In addition, the communication module 60 stores various information received from the external device in the memory 62 that can be used by the microprocessor 61. 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., which are provided in the vehicle 40 based on the information stored in the memory 62.

[0513] In addition, the base station in the present disclosure may also be rewritten as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink", "downlink", etc. may also be rewritten as terms corresponding to communication between terminals (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0514] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0515] In the present disclosure, operations are assumed to be performed by a base station, and sometimes by its upper node depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by a base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0516] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0517] The various modes / implementations described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 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, and next-generation systems based on these enhancements, corrections, production or regulations, etc. In addition, multiple systems can also be combined (for example, LTE or LTE-A, combination with 5G, etc.) for application.

[0518] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0519] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0520] The term "determining" used in the present disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0521] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0522] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0523] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0524] The “maximum transmit power” recorded in the present disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0525] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be rewritten as "access".

[0526] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-inclusive examples, being "connected" or "combined" to each other using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc.

[0527] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0528] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0529] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0530] In the present disclosure, "below", "less than", "above", "more than", "equal to", etc. can also be rewritten with each other. In addition, in the present disclosure, sentences meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. can also be rewritten with each other without being limited to the original degree, comparative degree and superlative degree. In addition, in the present disclosure, sentences meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. can also be rewritten with each other as expressions attached with "ith" (i is an arbitrary integer) without being limited to the original degree, comparative degree and superlative degree (for example, "highest" can also be rewritten with "i-th highest").

[0531] In the present disclosure, “of,” “for,” “regarding,” “related to,” “associated with,” etc. may also be replaced by each other.

[0532] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A receiving unit, receiving settings of channel state information for multiple transmission points; and The control unit determines the number of non-zero coefficients for each transmission point based on at least one of the minimum number and the maximum number of non-zero coefficients.

2. The terminal according to claim 1, wherein: The setting includes a parameter for determining a maximum value of the total number of all non-zero coefficients for the plurality of transmission points, The control unit determines the number of non-zero coefficients for each transmission point based on the parameter.

3. The terminal according to claim 1, wherein: The setting includes: a first parameter for determining a maximum value of the total number of all non-zero coefficients for the plurality of transmission points; and a second parameter for determining the maximum number of non-zero coefficients for each transmission point, The control unit determines the number of non-zero coefficients for each transmission point based on the first parameter and the second parameter.

4. The terminal according to claim 1, wherein: The number of non-zero coefficients for at least one of the plurality of transmission points is zero.

5. A wireless communication method of a terminal, comprising: The step of receiving a setting of channel state information for a plurality of transmission points; and The step of determining the number of non-zero coefficients for each transmission point based on at least one of the minimum number and the maximum number of non-zero coefficients.

6. A base station, comprising: a sending unit, sending settings of channel state information for multiple sending points; and The control unit controls reception of a report indicating the number of non-zero coefficients for each transmission point based on at least one of a minimum number and a maximum number of non-zero coefficients.

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