Terminal, wireless communication method, base station and system

Abstract

A terminal according to one aspect of the present disclosure comprises: a control unit that determines a plurality of pieces of channel state information (CSI) corresponding respectively to a plurality of transmission / reception points for coherent joint transmission (CJT); and a transmission unit that transmits one CSI report including the plurality of pieces of CSI. With this one aspect of the present disclosure, CSI reporting for CJT can be performed appropriately.

Description

[Technical Field]

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

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [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 [Problem to be solved by the invention]

[0005] In future wireless communication systems (e.g., NR), it is being considered to report channel state information (CSI) based on the reception of reference signals. It is also being considered to have one or more transmission / reception points (TRPs) (single TRP (STRP)) / multiple TRPs (MTRP)) perform DL transmission to a terminal (user terminal, user equipment (UE)). Coherent joint transmission (CJT) using multiple TRPs is also being considered.

[0006] However, there has been little progress in the study of how to set and report CSI for CJT. Unless such a method is clearly defined, there is a risk that communication throughput and communication quality will deteriorate.

[0007] Therefore, the present disclosure provides a terminal and a wireless communication method that appropriately report CSI to CJT. 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0008] A terminal according to one aspect of the present disclosure includes a plurality of transmission and reception points for coherent joint transmission. (TRP) a control unit for determining a plurality of channel state information (CSI) corresponding to the plurality of CSIs; MuC a transmitter for transmitting an SI report; and at least one of a maximum number of non-zero coefficients for each layer of the plurality of TRPs and a maximum number of non-zero coefficients for all layers of the plurality of TRPs is configured based on information about the CSI report. . [Effects of the Invention]

[0009] According to one aspect of the present disclosure, CSI reporting to the CJT can be performed appropriately. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 shows an example of a 16-level quantization table. [Figure 2] FIG. 2 shows an example of an 8-level quantization table. [Figure 3] FIG. 3 shows an example of transmission using K CSI-RS ports. [Figure 4] 4A and 4B show an example of a Rel. 16 type 2-port selection codebook. [Figure 5] 5A and 5B show an example of a Rel. 17 type 2-port selection codebook. [Figure 6] 6A and 6B show an example of an NCJT and a CJT. [Figure 7] 7A and 7B show an example of constraint 2. [Figure 8] FIG. 8 shows an example of report 2a-1. [Figure 9] FIG. 9 shows an example of report 2a-2. [Figure 10] FIG. 10 shows an example of report 2b. [Figure 11] Figure 11 shows an example of option 1-1. [Figure 12] FIG. 12 shows another example of option 1-1. [Figure 13] Figure 13 shows an example of option 1-2. [Figure 14] 14A and 14B show an example of Option 2-A. [Figure 15] Figure 15 shows an example of CJT CSI for Option 3-A. [Figure 16] FIG. 16 shows an example of a codebook for option 3-A. [Figure 17] Figure 17 shows an example of CJT CSI for Option 3-B. [Figure 18] FIG. 18 shows an example of a codebook for Option 3-B. [Figure 19] Figure 19 shows an example of CJT CSI for Option 3-C. [Figure 20]FIG. 20 shows an example of Option 3-D CJT CSI. [Figure 21] FIG. 21 shows an example of a new table for the inter-TRP amplitude codebook. [Figure 22] FIG. 22 shows an example of a new table for an inter-TRP phase codebook. [Figure 23] FIG. 23 shows an example of a new table for the inter-TRP coefficient codebook. [Figure 24] 24A and 24B show an example of the mapping order of CSI parts 1 and 2 according to embodiment #A5. [Figure 25] FIG. 25 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 26] FIG. 26 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 27] FIG. 27 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 28] FIG. 28 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. [Figure 29] FIG. 29 is a diagram illustrating an example of a vehicle according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (CSI report or reporting) In Rel.15 NR, a terminal (also referred to as a user terminal, User Equipment (UE), etc.) generates (also referred to as determining, calculating, estimating, measuring, etc.) channel state information (CSI) based on a reference signal (RS) (or a resource for the RS), and transmits (also referred to as reporting, feeding back, etc.) the generated CSI to a network (e.g., a base station). The CSI may be transmitted to the base station using, for example, an uplink control channel (e.g., a Physical Uplink Control Channel (PUCCH)) or an uplink shared channel (e.g., a Physical Uplink Shared Channel (PUSCH)).

[0012] The RS used to generate the CSI may be, for example, at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), a Demodulation Reference Signal (DMRS), etc.

[0013] The CSI-RS may include at least one of a Non-Zero Power (NZP) CSI-RS and a CSI-Interference Management (CSI-IM). The SS / PBCH block is a block including an SS and a PBCH (and corresponding DMRS), and may be referred to as an SS block (SSB). The SS may also include at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).

[0014] The CSI may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), a Layer 1 Reference Signal Received Power (L1-RSRP), a Reference Signal Received Quality (L1-RSRQ), a Signal to Interference plus Noise Ratio (L1-SINR), a Signal to Noise Ratio (L1-SNR), and the like.

[0015] The UE may receive information related to CSI reporting (report configuration information) and control CSI reporting based on the report configuration information. The report configuration information may be, for example, "CSI-ReportConfig" of an information element (IE) of Radio Resource Control (RRC). Note that in the present disclosure, RRC IE may be interchangeably read as RRC parameters, higher layer parameters, etc.

[0016] The reporting configuration information (for example, the RRC IE "CSI-ReportConfig") may include, for example, at least one of the following: Information about the type of CSI report (report type information, e.g., RRC IE "reportConfigType") Information about one or more quantities of CSI to be reported (one or more CSI parameters) (report quantity information, e.g., RRC IE "reportQuantity") Information about the RS resources used to generate the quantity (CSI parameter) (resource information, for example, the RRC IE "CSI-ResourceConfigId") Information about the frequency domain to which CSI is reported (frequency domain information, e.g., RRC IE "reportFreqConfiguration")

[0017] For example, the report type information may indicate periodic CSI (P-CSI) reporting, aperiodic CSI (A-CSI) reporting, or semi-persistent CSI (SP-CSI) reporting.

[0018] Furthermore, the reporting amount information may specify a combination of at least one of the above CSI parameters (for example, CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0019] The resource information may also be IDs of resources for RSs, which may include, for example, non-zero power CSI-RS resources or SSBs and CSI-IM resources (e.g., zero power CSI-RS resources).

[0020] The frequency domain information may also indicate frequency granularity of CSI reporting. The frequency granularity may include, for example, a wideband and a subband. The wideband is the entire CSI reporting band. The wideband may be, for example, the entirety of a certain carrier (a component carrier (CC)), a cell, or a serving cell), or the entirety of a bandwidth part (BWP) within a certain carrier. The wideband may also be referred to as a CSI reporting band, the entire CSI reporting band, etc.

[0021] Furthermore, a subband is a part of a wideband and may be configured with one or more resource blocks (RBs or PRBs). The size of the subband may be determined according to the size of the BWP (the number of PRBs).

[0022] The frequency domain information may indicate whether wideband or subband PMI is to be reported (for example, the frequency domain information may include an RRC IE "pmi-FormatIndicator" used to determine whether wideband PMI reporting or subband PMI reporting is to be performed). The UE may determine the frequency granularity of the CSI report (i.e., whether wideband PMI reporting or subband PMI reporting is to be performed) based on at least one of the above-mentioned reporting amount information and frequency domain information.

[0023] When wideband PMI reporting is configured, one wideband PMI may be reported for the entire CSI reporting band, whereas when subband PMI reporting is configured, a single wideband indication i1 may be reported for the entire CSI reporting band, and one subband indication i2 (e.g., one subband indication for each subband) may be reported for each of one or more subbands within the entire CSI reporting band.

[0024] The UE performs channel estimation using the received RS to estimate a channel matrix H. The UE feeds back a performance management index (PMI) determined based on the estimated channel matrix.

[0025] The PMI may indicate a precoder matrix (also simply referred to as a precoder) that the UE considers appropriate for use in downlink (DL) transmissions to the UE. Each value of the PMI may correspond to one precoder matrix. A set of PMI values ​​may correspond to a set of different precoder matrices called a precoder codebook (also simply referred to as a codebook).

[0026] In the space domain, a CSI report may include one or more types of CSI. For example, the CSI may include at least one of a first type (Type 1 CSI) used for single-beam selection and a second type (Type 2 CSI) used for multi-beam selection. The single beam may be rephrased as a single layer, and the multi-beam may be rephrased as multiple beams. Furthermore, Type 1 CSI does not assume multi-user multiple input multiple output (MIMO), while Type 2 CSI may assume multi-user MIMO.

[0027] The codebook may include a codebook for Type-1 CSI (also referred to as a Type-1 codebook, etc.) and a codebook for Type-2 CSI (also referred to as a Type-2 codebook, etc.). Furthermore, Type-1 CSI may include Type-1 single-panel CSI and Type-1 multi-panel CSI, and different codebooks (Type-1 single-panel codebook, Type-1 multi-panel codebook) may be defined for each.

[0028] In the present disclosure, Type 1 and Type I may be interpreted as interchangeable. In the present disclosure, Type 2 and Type II may be interpreted as interchangeable.

[0029] The uplink control information (UCI) type may include at least one of a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), a scheduling request (SR), and CSI. The UCI may be carried by the PUCCH or the PUSCH.

[0030] In Rel.15 NR, UCI can contain one CSI part for wideband PMI feedback. CSI report #n contains PMI wideband information if reported.

[0031] In Rel.15 NR, UCI can include two CSI parts for subband PMI feedback. CSI Part 1 includes wideband PMI information. CSI Part 2 includes one wideband PMI and several subband PMIs. CSI Part 1 and CSI Part 2 are coded separately.

[0032] In Rel. 15 NR, a UE is configured by higher layers with N (N≧1) CSI reporting configuration report settings and M (M≧1) CSI resource configuration resource settings. For example, the CSI reporting configuration (CSI-ReportConfig) includes a channel measurement resource setting (resourcesForChannelMeasurement), a CSI-IM resource setting for interference (csi-IM-ResourceForInterference), an NZP-CSI-RS setting for interference (nzp-CSI-RS-ResourceForInterference), and a report quantity (reportQuantity). The channel measurement resource setting, the interference CSI-IM resource setting, and the interference NZP-CSI-RS setting are each associated with a CSI resource configuration (CSI-ResourceConfig, CSI-ResourceConfigId). The CSI resource configuration includes a list of CSI-RS resource sets (csi-RS-ResourceSetList, for example, an NZP-CSI-RS resource set or a CSI-IM resource set).

[0033] For both FR1 and FR2, evaluation and provision of CSI reporting for DL ​​multi-TRP and / or multi-panel transmissions is being considered to enable more dynamic channel / interference hypotheses for NCJT.

[0034] (Multi-TRP) In NR, one or more Transmission / Reception Points (TRPs) (multi-TRPs (MTRPs)) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs using one or more panels.

[0035] Note that multiple TRPs may correspond to the same cell identifier (ID), or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0036] The multi-TRPs (TRP#1, #2) may be connected by an ideal / non-ideal backhaul and exchange information, data, etc. Each TRP of the multi-TRP may transmit a different code word (CW) and a different layer. Non-Coherent Joint Transmission (NCJT) may be used as a form of multi-TRP transmission.

[0037] In the NCJT, for example, TRP1 performs modulation mapping and layer mapping on a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP2 performs modulation mapping and layer mapping on a second codeword to transmit a second number of layers (e.g., two layers) with a second precoding.

[0038] Note that multiple PDSCHs (multi-PDSCHs) that are non-coherent may be defined as partially or completely overlapping in at least one of the time and frequency domains, i.e., a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in at least one of the time and frequency resources.

[0039] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (Quasi-Co-Location (QCL)). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0040] Multiple PDSCHs from multiple TRPs (which may be referred to as multiple PDSCHs) may be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single master mode). One DCI may be transmitted from one TRP of the multiple TRPs. Multiple PDSCHs from multiple TRPs may be scheduled using multiple DCIs (multiple DCI (M-DCI), multiple PDCCHs) (multiple master mode). Multiple DCIs may be transmitted from the multiple TRPs respectively. A UE may be assumed to transmit separate CSI reports for each TRP to different TRPs. Such CSI feedback may be referred to as separate feedback, separate CSI feedback, etc. In the present disclosure, "separate" may be interchangeably read as "independent."

[0041] Note that CSI feedback in which CSI reports for both TRPs are transmitted to one TRP may be used, and such CSI feedback may be referred to as joint feedback, joint CSI feedback, or the like.

[0042] For example, in the case of separate feedback, the UE is configured to transmit a CSI report for TRP#1 using one PUCCH (PUCCH1) for TRP#1 and a CSI report for TRP#2 using another PUCCH (PUCCH2) for TRP#2. In the case of joint feedback, the UE transmits a CSI report for TRP#1 and a CSI report for TRP#2 for TRP#1 or #2.

[0043] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0044] (Codebook settings) The UE is configured with parameters related to the codebook (codebook configuration (CodebookConfig)) by higher layer signaling (RRC signaling). The codebook configuration is included in the CSI report configuration (CSI-ReportConfig) of higher layer (RRC) parameters.

[0045] In the codebook setting, at least one codebook is selected from among type 1 single panel (typeI-SinglePanel), type 1 multi-panel (typeI-MultiPanel), type 2 (typeII), and type 2 port selection (typeII-PortSelection).

[0046] The codebook parameters include the codebook subset restriction (CBSR) parameters (...Restriction). The CBSR settings are bits that indicate which PMI reports are allowed ('1') and which are not allowed ('0') for the precoder associated with the CBSR bit. One bit in the CBSR bitmap corresponds to one codebook index / antenna port.

[0047] (CSI reporting settings) The CSI reporting configuration (CSI-ReportConfig) in Rel.16 includes not only the codebook configuration (CodebookConfig) but also CSI-RS resources for channel measurement (resourcesForChannelMeasurement (CMR)), CSI-RS resources for interference measurement (csi-IM-ResourcesForInterference (ZP-IMR), nzp-CSI-RS-ResourcesForInterference (NZP-IMR)), etc. Of the parameters of CSI-ReportConfig, all parameters except codebookConfig-r16 are also included in the CSI reporting configuration in Rel.15.

[0048] Rel. 17 considers an extended CSI reporting configuration (CSI-ReportConfig) for CSI measurement / reporting of multi-TRP using NCJT. In this CSI reporting configuration, two CMR groups corresponding to two TRPs are configured. CMRs in a CMR group may be used for at least one of multi-TRP and single-TRP measurements using NCJT. N CMR pairs of NCJT are configured by RRC signaling. UEs may be configured by RRC signaling whether to use a CMR of a CMR pair for single-TRP measurements.

[0049] For CSI reporting related to multi-TRP / panel NCJT measurements configured by a single CSI reporting configuration, it is considered that at least one of the following options 1 and 2 will be supported:

[0050] <Option 1> The UE is configured to report X CSIs (X=0, 1, 2) associated with single TRP measurement hypotheses / assumptions and one CSI associated with the NCJT measurement. If X=2, the two CSIs are associated with two different single TRP measurements using CMRs from different CMR groups.

[0051] <Option 2> The UE may be configured to report one CSI associated with the best measurement result among the measurement hypotheses for the NCJT and single TRP.

[0052] As described above, in Rel.15 / 16, CBSR is configured for each codebook configuration for each CSI reporting configuration, i.e., CBSR is applied to all CMRs, etc., within the corresponding CSI reporting configuration.

[0053] However, in the CSI reporting configuration for multi-TRP in Rel.17, if the above-mentioned options 1 and 2 are applied, the following measurement configuration may be performed: Option 1 (X=0): Measurement of CSI only for NCJT. Option 1 (X=1): Measure the CSI of the NCJT and the CSI of a single TRP. Option 1 (X = 2): Measurement of the CSI of the NCJT and the CSI of a single TRP (two TRPs). Option 2: Measure both the CSI of the NCJT and the CSI of a single TRP.

[0054] (Type 2 CSI) Assuming an ideal backhaul, synchronization, and the same number of antenna ports across multiple TRPs, CSI acquisition for coherent joint transmission (CJT) for FR1 and up to four TRPs is considered. For CJT multi-TRP for FDD, an improvement to the Rel. 16 / 17 Type-2 codebook is considered.

[0055] In this disclosure, a matrix Z with X rows and Y columns may be expressed as Z(X×Y).

[0056] In Rel. 15, Type 2 CSI generates a subband-wise (SB-wise) precoding vector for a given layer k based on the following equation: W k (N t ×N3) = W1W 2,k (1)

[0057] N t is the number of ports. N3 is the total number of precoding matrices (number of subbands) indicated by the PMI. L is the number of beams. W1(N t × 2L) is a matrix consisting of L∈{2,4} spatial domain (SD) two-dimensional (2D) DFT vectors (SD beam vectors, 2D-DFT vectors). For example, L=2 SD 2D-DFT vectors are each i ,b j W 2,k(2L×N3) is the subband complex linear combination (LC) coefficient matrix for layer k. For example, two W 2,k are c i ,c j For example, the channel matrix h is a linear combination of L=2 SD 2D-DFT vectors, c i b i ,+c j b j The feedback overhead is mainly due to the LC coefficient matrix W 2,k Also, Type 2 CSI in Rel. 15 only supports ranks 1 and 2.

[0058] Type 2 CSI in Rel.16 uses frequency domain (FD) compression to 2,k Rel. 16 Type 2 CSI supports ranks 3 and 4 in addition to ranks 1 and 2.

[0059] In Rel.16, Type 2 CSI may be reported by the UE for a given layer k based on the following equation: W k = W1W ~ k W f,k H (2)

[0060] W 2,k is W ~ k W f,k H It is approximated by the matrix W ~ can be expressed by adding a tilde (~) to W. f,k H is W f,k is the adjoint matrix of

[0061] For CSI reporting, the UE may be configured with one of two subband sizes. The subbands (CQI subbands) are N PRBSB It is defined as a set of consecutive PRBs and may depend on the total number of PRBs within the BWP. The number of PMI subbands R per CQI subband is set by the RRC IE (numberOfPMI-SubbandsPerCQI-Subband). R controls the total number N3 of precoding matrices represented by PMI as a function of the number of subbands set within the csi-ReportingBand, the subband size set by subbandSize, and the total number of PRBs within the BWP.

[0062] W1(N t ×2L) is a matrix consisting of a plurality of spatial domain (SD) 2D-DFT (vectors). For this matrix, a plurality of indices of the two-dimensional discrete Fourier transform (2D-DFT) vector and the two-dimensional oversampling factor are reported. The response / distribution of the spatial domain represented by the SD 2D-DFT vector may be referred to as an SD beam.

[0063] W ~ k (2L×M v ) is a matrix consisting of combination coefficients (subband complex linear combination (LC) coefficients). For this matrix, up to K0 non-zero coefficients (NZCs) are reported. The report consists of two parts: a bitmap capturing the NZC positions and the quantized NZCs.

[0064] W f,k ​​​​​​DFTs are selected. If N3≦19, log2(C(N3−1,M v -1)) bits are reported, where C(N3-1,M v -1) is N3-1 to M v The number of combinations to select one of the FD basis vectors is also called the binomial coefficients. The frequency domain response / distribution (frequency response) represented by a linear combination of the FD basis vectors and the coupling coefficients may be called an FD beam. The FD beam may correspond to a delay profile (time response).

[0065] A subset of the FD basis is {f1,...,f Mv} where f i is the i-th FD basis for the k-th layer, i∈{1,...,M v}. The PMI subband size is given by CQI subband size / R, where R∈{1,2}. The number of FD bases for a given rank v is M v is ceil(p v ×N3 / R). The number of FD bases is the same for all layers k∈{1,2,3,4}. p v is set by higher layers.

[0066] Matrix W 2,k Each row of represents the channel frequency response of a particular SD beam. If the SD beam has high directivity, the channel taps per beam are limited (the power delay profile becomes sparse in the time domain). As a result, the channel frequency response per SD beam has high correlation (approaches flat in the frequency domain). In this case, the channel frequency response can be approximated by a linear combination of a small number of FD bases. For example, M v = 2, the FD basis f2,f q and the linear combination coefficient d1 0 ,d2 0 and the frequency response associated with the SD beam b0 is d1 0 f2+,d2 0 f qis approximated by

[0067] Maximum gain M v FD bases are selected. M v <<By setting it to N3, W ~ k The overhead of W 2,k The overhead is much smaller than that of M v All or part of the FD bases are used to approximate the frequency response of each SD beam. A bitmap is used to report only the FD bases selected for each SD beam. If no bitmap is reported, all FD bases are selected for each SD beam. In this case, the nonzero coefficients (NZCs) of all FD bases are reported for each SD beam. The maximum number of NZCs in a layer, K, is k NZ ≦K0=ceil(β×2LM v ) and the maximum number of NZCs across all layers is K NZ ≦2K0=ceil(β×2LM v ) where β is set by higher layers.

[0068] W ~ k Each reported complex coefficient in is a separately quantized amplitude and phase. [Amplitude quantization] The polarization-specific reference amplitudes are 16-level quantized using the table in Figure 1. All other coefficients are 8-level quantized using the table in Figure 2. [Phase Quantization] All coefficients are quantized using 16-PSK. For example, φ l,i = exp(j2πc l,i / 16), c l,i ∈{0,...,15}, where c l,i is the associated phase value φ l,i is the phase factor reported by the UE (using 4 bits) for

[0069] Type 2 CSI feedback on PUSCH in Rel. 16 includes two parts. Part 1 has a fixed payload size and is used to identify the number of information bits in Part 2. In enhanced Type 2 CSI feedback, Part 1 includes the RI, CQI, and an indication of the total number of non-zero amplitudes across multiple layers for enhanced Type 2 CSI. The fields in Part 1 are coded separately. Part 2 includes the PMI for enhanced Type 2 CSI. Parts 1 and 2 are coded separately. CSI Part 2 (PMI) includes the oversampling factor, the index of the 2D-DFT basis, and the index M of the initial DFT basis (start offset) of the selected DFT window. initial and at least one of the selected DFT basis for each layer, the non-zero LC coefficients (NZC, amplitude and phase) for each layer, the strongest coefficient indicator (SCI) for each layer, and the amplitude of the strongest coefficient for each layer / polarization.

[0070] The multiple PMI indices (PMI values, codebook indices) associated with different CSI part 2 information may be as follows for the kth layer: i 1,1 : oversampling factor i 1,2 :Multiple indices of 2D-DFT basis i 1,5 : The index (start offset) of the initial DFT basis of the selected DFT window M initial i 1,6,k : The DFT basis selected for the kth layer i 1,7,k : the bitmap for the kth layer i 1,8,k : The strongest coefficient indicator (SCI) for the kth layer i 2,3,k : the amplitude of the strongest coefficient (for both polarizations) of the kth layer i2,4,k : the amplitude of the reported coefficient of the kth layer i 2,5,k : the phase of the reported coefficients of the kth layer

[0071] i 1,5 and i 1,6,k is the PMI index for DFT basis reporting. Only if N3>19, i 1,5 is reported.

[0072] For a given CSI report, the PMI information is grouped into three groups (groups 0 to 2) for CSI part 2 grouping. This is important when CSI omission is used. Index i 2,4,l , i 2,5,l , i 1,7,l Each reported element of is associated with a specific priority rule. Groups 0 to 2 follow: Group 0: Index i 1,1 , i 1,2 , i 1,8,l (l=1,...,v) Group 1: Index i (if reported) 1,5 , index i (if reported) 1,6,l , i 1,7,l The best (top) v2LM v -floor(K NZ / 2) priority elements, i 2,3,l , i 2,4,l The highest (upper) ceil(K NZ / 2)-v priority elements, i 2,5,l The highest (upper) ceil(K NZ / 2) - v priority elements (l=1,...,v) Group 2:i 1,7,l The lowest (lowest) floor (K NZ / 2) priority elements, i 2,4,l The lowest (lowest) floor (K NZ / 2) priority elements, i 2,5,l The lowest (lowest) floor (K NZ / 2) priority elements (l=1,...,v)

[0073] In Rel. 16 Type-2 port selection (PS) CSI, the Type-2 PS codebook (CB) does not require the UE to derive SD beams by considering the 2D-DFT in the regular Type-2 CB. Instead, the base station transmits CSI-RS using K CSI-RS ports that are beamformed by considering a set of SD beams (Figure 3). The UE identifies the best L (≦K) CSI-RS ports and reports their indices in W1.

[0074] In Type-1 CSI, an SD beam represented by an SD DFT vector is sent toward the UE. In Type-2 CSI, L SD beams are linearly combined and sent toward the UE. Each SD beam can be associated with multiple FD beams. For the corresponding SD beam, the channel frequency response can be obtained by linearly combining the FD basis vectors. The channel frequency response corresponds to the power delay profile.

[0075] For layer k∈{1,2,3,4}, the subband(SB)-wise precoder generation is given by: W k (N t ×N3) = QW1W ~ k W f,k H (3)

[0076] Here, Q(N t ×K) denotes the K SD beams used for CSI-RS beamforming. W1(K×2L) is a block diagonal matrix. W ~ k (2L×M) is the LC coefficient matrix. W f,k (N3×M) consists of N3 DFT basis vectors (FD basis vectors). K is set by the upper layer. L is set by the upper layer. P CSI-RS∈{4,8,12,16,24,32}. P CSI-RS > 4, then L∈{2,3,4}.

[0077] (Rel.17 type 2-port selectable CSI) In the Rel.15 / 16 type 2 port selection CSI / codebook, each CSI-RS port #i is assigned to the SD beam (b i ) (Figures 4A and 4B). In the Rel. 17 Type 2 port selection CSI / codebook (extended Type 2 port selection codebook), each CSI-RS port #i is associated with an SD-FD beam pair (SD beam b i and FD beam f i,j (j is the frequency index) (FIGS. 5A and 5B). In this example, ports 3 and 4 are associated with the same SD beam and different FD beams.

[0078] The frequency selectivity of the channel frequency response observed at the UE based on an SD beam-FD beam pair can be reduced to be less than the frequency selectivity of the channel frequency response observed at the UE based on an SD beam by delay pre-compensation.

[0079] The main scenario for the Rel.17 Type 2 port selection codebook is FDD. Although the channel reciprocity based on SRS measurement is not perfect, the base station can obtain some partial information. By using SRS measurement at the base station in addition to CSI reporting, the base station can obtain CSI for determining the DL MIMO precoder. In this case, some CSI reporting may be omitted to reduce the CSI overhead.

[0080] In Rel.17 Type 2PS CSI, each CSI-RS port is beamformed using an SD beam and an FD basis vector, and each port is associated with an SD-FD pair.

[0081] For a given layer k, information based on the following equation may be reported by the UE: W k (K×N3) = W1W ~ k W f,k H (4)

[0082] For W1(K × 2L), each matrix block consists of L columns of a K × K identity matrix. The base station transmits K beamformed CSI-RS ports, each associated with an SD-FD pair. The UE selects L ports out of the K and assigns them to the PMI (W 1,k ) to the base station.

[0083] W ~ k (2L×M v ) is a matrix of combining coefficients (subband complex LC coefficients). At most K0 NZCs are reported. The report consists of two parts: a bitmap capturing the NZC positions and the quantized NZCs. In certain cases the bitmap can be omitted.

[0084] W f,k (N3×M v ) is a matrix consisting of N3 FD basis (FD DFT basis) vectors. v There are FD bases. The base station is f,k You can also erase W f,k If is on, M v additional FD bases are reported. W f,k If is off, no additional FD bases are reported.

[0085] Regarding NCJT CSI of Rel.17, K sTwo CMR groups with (=K1+K2) CMRs are configured in the UE, where K1 and K2 are the numbers of CMRs in the two CMR groups, respectively. N CMR pairs are configured by the higher layer by selecting from all possible pairs. N=1 and K s =2 is supported. max =2 is an optional feature of the UE. s,max =2 is an optional feature of the UE.

[0086] The UE may support at least one of the following two options: [Option 1] The UE may be configured to report X CSIs associated with a single TRP measurement hypotheses and one CSI associated with an NCJT measurement hypothese. X may be 0, 1, or 2. When X=2, two CSIs are associated with different single TRP measurement hypotheses that use multiple CMRs from different CMR groups. Supporting X=1, 2 is an optional feature for this Option 1. [Option 2] The UE may be configured to report one CSI associated with the best one of the NCJT measurement premise and the single TRP measurement premise.

[0087] (JT) Joint transmission (JT) may refer to simultaneous data transmission from multiple points (eg, TRPs) to a single UE.

[0088] Rel. 17 supports NCJT from two TRPs. The PDSCHs from the two TRPs may be independently precoded and independently decoded. The frequency resources may be non-overlapping, partially overlapping, or fully overlapping. If overlap occurs, the PDSCH from one TRP will interfere with the PDSCH from the other TRP.

[0089] Figure 6A shows an example of NCJT from two TRPs. Signal x1 from the first TRP is precoded by precoding matrix V1 and transmitted, affected by channel matrix H1, and received as signal y1. Signal x2 from the second TRP is precoded by precoding matrix V2 and transmitted, affected by channel matrix H2, and received as signal y2. Layer i may be from one TRP, where H1 = U1ΣV1. H , H2=U2ΣV2 H , y1=H1V1x1, y2=H2V2x2.

[0090] Rel. 18 is considering supporting CJT using up to four TRPs. Data from the four TRPs may be coherently precoded and transmitted to the UE on the same time-frequency resource. For example, the same precoding matrix may be used to consider channels from the four TRPs. Coherence may mean that there is a certain relationship between the phases of the multiple received signals. Using four-TRP joint precoding, signal quality may be improved and there may be no interference between the four TRPs. Data may only be subject to interference outside the four TRPs.

[0091] Figure 6B shows an example of CJT from four TRPs. Signals from the first to fourth TRPs are precoded by a precoding matrix V and transmitted. Signals x from the first to fourth TRPs are affected by channel matrices H1, H2, H3, and H4, respectively, and received as signal y. Layer i may be from four TRPs, where H = H1 + H2 + H3 + H4 = UΣV H , y=HVx.

[0092] In the ideal case (where four TRPs are co-located), a joint estimation of the aggregated channel matrix H can be performed, and a joint precoding matrix V can be fed back. However, the large-scale path losses of the four paths can vary significantly. A joint precoding matrix V based on a constant module codebook is not accurate. In this case, per-TRP feedback and inter-TRP coefficients can be matched by the current NR Type-2 codebook.

[0093] For a CJT of up to four TRPs in FR1, the selection of the four TRPs may be semi-static. Therefore, the selection and configuration of the four CMRs (four CSI-RS resources) for channel measurements may also be semi-static. Dynamic indication of the four TRPs from a list of CSI-RS resources is also possible, but unlikely.

[0094] The path losses from the four TRPs to the UE are different, making it difficult to simply report one aggregated CSI that represents the joint channel matrix.

[0095] Considering the fallback behavior to NCJT (i.e., single TRP), per-TRP CSI (i.e., single-TRP CSI such as Rel. 17noNCJT CSI) is also important.

[0096] The following are being considered: CMR & IMR for measurement of up to 4 TRPs. Per-TRP CSI with inter-TRP CSI feedback for X-TRP CJT (CJT with X TRPs). Inter-TRP CSI: Novel feedback and codebook for inter-TRP phase matrix / inter-TRP amplitude matrix / inter-TRP matrix (including both amplitude and phase). X-TRP CJT CQI can be added and reported.

[0097] Here, the following problems may arise. (Question 1) If CMRs for X TRPs are configured in one CSI reporting configuration (CSI-ReportConfig) and CSI for each TRP is reported in one CSI report, what are the constraints / relationships for the CSI for each TRP? (Question 2) If CMRs for X TRPs are configured in one CSI reporting configuration (CSI-ReportConfig) and CSI for each TRP is reported in one CSI report, what is the order / operation of UE measurements? (Question 3) What will be the details of the codebook and feedback between TRPs?

[0098] Therefore, the present inventors came up with a method for setting / reporting CSI to the CJT.

[0099] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Each of the following embodiments (for example, each case) may be used alone, or at least two of them may be combined and applied.

[0100] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0101] In the present disclosure, terms such as activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0102] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, information elements (IEs), configurations, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0103] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0104] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0105] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0106] In this disclosure, the terms index, identifier (ID), indicator, resource ID, etc. may be interchangeable. In this disclosure, the terms sequence, list, set, group, cluster, subset, etc. may be interchangeable.

[0107] In this disclosure, the terms panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmitting entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, etc. may be read as interchangeable.

[0108] In the present disclosure, time domain resource allocation and time domain resource assignment may be read interchangeably.

[0109] In the present disclosure, beam, SD beam, SD vector, and SD 2D-DFT vector may be interchangeable. L, the number of SD beams, the number of beams, and the number of SD 2D-DFT vectors may be interchangeable.

[0110] In this disclosure, FD basis, FD DFT basis, DFT basis, f i In the present disclosure, FD beam, FD vector, FD basis vector, FD DFT basis vector, and DFT basis vector may be interchangeable.

[0111] (Wireless communication method) In each embodiment, at least one of the above-mentioned Rel. 16 Type 2 CSI reporting, Rel. 16 Type 2 port selection CSI reporting, and Rel. 17 Type 2 port selection CSI reporting may be considered as single TRP CSI.

[0112] In each embodiment, X TRPs and X-TRPs may be interchangeable. In each embodiment, CJTs using X TRPs and X-TRP CJTs may be interchangeable.

[0113] In each embodiment, the reference CSI, the CSI for the reference TRP, and the first reported CSI may be interchangeable. In each embodiment, the reference TRP, the CSI corresponding to the reference CSI, the TRP corresponding to the first reported CSI, and the CSI-RS resource / CMR / CMR group / CSI-RS resource set corresponding to the first reported CSI may be interchangeable. In each embodiment, the TRP, CSI-RS resource, CMR, CMR group, and CSI-RS resource set may be interchangeable.

[0114] In each embodiment, inter-TRP, inter-TRP difference, and inter-TRP comparison may be read interchangeably.

[0115] In various embodiments, the terms inter-TRP phase index and inter-TRP phasing index may be interchangeable. In various embodiments, the terms inter-TRP index and inter-TRP coefficient index may be interchangeable.

[0116] In each embodiment, the terms "inter-TRP phase matrix" and "inter-TRP phasing matrix" may be interchangeable. In each embodiment, the terms "inter-TRP matrix" and "inter-TRP coefficient matrix" may be interchangeable.

[0117] In each embodiment, an inter-TRP phase codebook and an inter-TRP phase adjusting codebook may be interchangeable. In each embodiment, an inter-TRP codebook and an inter-TRP coefficient codebook may be interchangeable.

[0118] In each embodiment, the target resource, CMR, CSI-RS resource, NZP-CSI-RS resource, CMR group, CSI-RS resource set, NZP-CSI-RS resource set, and TRP may be interchangeable.

[0119] In each embodiment, the inter-TRP codebook and the multi-panel codebook for the Type 2 codebook may be interchangeable.

[0120] In each embodiment, the operation of inter-TRP codebook reporting may be similar to the operation of inter-panel codebook reporting.

[0121] In each embodiment, the FD basis vector size, the number of FD bases, M v Size: M v , M v,i , may be read interchangeably.

[0122] <Embodiment 1> If it is configured for CJT CSI that CSI per TRP is reported within one CSI report, one or more of the following constraints 1 to 3 may be considered for the CSI per TRP.

[0123] 《Constraint 1》 The same RI is assumed for the CSI measurements for each TRP. Only common RI reporting may be required. For example, an RI report may be included in the first CJT CSI, but not in the second / third / fourth CJT CSI. If the RI reports for the CSI for each TRP are different, it becomes difficult for the base station to update those RIs for the CJT CSI.

[0124] 《Constraint 2》 At least one of common parameters and distinct parameters is configured for each TRP, where each TRP, each CMR, each CMR group, and each CMR set may be interchangeable. The parameters may be represented by at least one of the following parameter fields: Supported parameter (codebook parameter) combinations (L,p v ,β,α,M) ,value / index corresponding to a combination of at least one value of M (paramCombination). ·A field indicating how PMI subbands are defined per CQI subband (numberOfPMI-SubbandsPerCQI-Subband). · The number of beams used in the linear combination, L (numberOfBeams). The size of the PSK alphabet, QPSK or 8-PSK (phaseAlphabetSize). A field (subbandAmplitude) that is true if subband amplitude reporting is activated. The value of N (for example, if M=2, the parameter N∈{2,4} is set) (valueOfN).

[0125] In Rel.15 / 16 / 17, these parameters are configured per codebook configuration (CodebookConfig) and per CSI reporting configuration (CSI-ReportConfig). In the CJT CSI configuration, some of these parameters may be configured per TRP. In the CJT CSI configuration, the CSI of the 2nd / 3rd / 4th TRP may have coarser feedback granularity and smaller overhead than the CSI of the 1st TRP. In the paramCombination, different (L,p v , β) may be set. For the CJT CSI setting, the paramCombination can be used to set some parameters common to the TRP (e.g., common L) and some parameters specific to the TRP (e.g., p v , β) may be set.

[0126] Figure 7A shows the W for the first TRP. ~ and W for the second TRP ~ As shown in this example, different numbers of SD beams L (L1, L2) may be set for the CSI of the first TRP and the CSI of the second TRP.

[0127] Figure 7B shows the W for the first TRP. ~ and W for the second TRP ~ As in this example, the same number of SD beams L and a different maximum number of NZCs (β=½, ¼) for each layer may be set for each TRP.

[0128] 《Constraint 3》 In the CSI-ReportConfig, at least one of the following settings 3a to 3d is introduced for all X TRPs (all CMRs / IMRs). [Setting 3a] Maximum number of non-zero coefficients (NZCs) for each layer of all X TRPs in the CSI-ReportConfig. [Setting 3b] Maximum number of NZCs for all layers of all X TRPs in CSI-ReportConfig. [Setting 3c] Maximum number of SD beams for all X TRPs in CSI-ReportConfig. [Setting 3d] Number of FD bases (FD basis vector size) M for all X TRPs in CSI-ReportConfig v The maximum number of.

[0129] UE capability signaling for at least one of constraints 1 to 3 may be introduced.

[0130] According to this embodiment, the UE may appropriately report CSI for each of the X TRPs in one CSI report based on the constraints / relationships.

[0131] <Embodiment 2> If it is configured that CSI per TRP is reported within one CSI report for CJT CSI, the measurement order / operations may follow at least one of the following operations 1 to 4.

[0132] 《Operation 1》 First, (assuming single-TRP reception) the best TRP / CRI / CSI (CSI of the first TRP, CSI of the first CJT) is selected. Next, assuming 2-TRP CJT reception, the CSI of the second TRP is measured based on the CSI of the first CJT. Next, assuming 3-TRP CJT reception, the CSI of the third TRP is measured based on the CSI of the first and second CJTs. Next, assuming 4-TRP CJT reception, the CSI of the fourth TRP is measured based on the CSI of the first, second, and third CJTs. In this case, the UE may assume different receive beamforming matrices when measuring the CSI of the second, third, and fourth TRP.

[0133] 《Operation 2》 First, (assuming single-TRP reception) the best TRP / CRI / CSI (CSI of the first TRP, CSI of the first CJT) is selected. Next, assuming 2-TRP CJT reception, the CSI of the second TRP (and similarly the CSI of the third and fourth TRPs) is measured based on the CSI of the first CJT. In this case, the UE may assume the same receive beamforming matrix when measuring the CSI of the second, third, and fourth TRPs.

[0134] 《Operation 3》 First, the best TRP / CRI / CSI (CSI of the first TRP, CSI of the first CJT) is selected (assuming single-TRP reception). Next, assuming 4-TRP CJT reception, the CSI of the second, third, and fourth TRPs is measured based on the CSI of the first CJT. In this case, the UE may assume the same receive beamforming matrix when measuring the CSI of the second, third, and fourth TRPs.

[0135] 《Operation 4》 Assuming 4-TRP CJT reception, the CSI of the first, second, third, and fourth TRPs is measured. In this case, the UE may assume the same receive beamforming matrix when measuring the CSI of the first, second, third, and fourth TRPs.

[0136] UE capability signaling for at least one of actions 1 to 4 may be introduced.

[0137] According to this embodiment, the UE can properly measure for reporting CSI for every X TRPs in one CSI report.

[0138] <Embodiment 3> For inter-TRP CSI / PMI (e.g., inter-TRP amplitude and inter-TRP phase, or inter-TRP phase only), the UE may follow at least one of the following reporting 1 to 2:

[0139] 《Report 1》 There may be an independent codebook and feedback for CSI / PMI between TRPs before (above) the existing Rel.16 / 17 Type 2 codebook. The independent codebook and feedback may follow at least one of embodiments #A1 to #A6. The CSI / PMI between TRPs may follow at least one of the following reports 1A to 1B.

[0140] [Report 1A] The size of the matrix W2 for inter-TRP CSI / PMI is 1 × 1. This may mean that inter-TRP PMI between two TRPs is taken into account. In this case, W2 may be common to multiple layers.

[0141] [Report 1B] The size of matrix W2 for CSI / PMI between TRPs is N t ×N t , or K × K based on Rel.17 Type 2 port selection CSI. This may mean that inter-TRP PMI between each antenna port from two TRPs is considered. In this case, W2 may be common to multiple layers.

[0142] The first CJT CSI for layer l of the first TRP (best TRP) may be expressed by the following equation: W l,1 (N t ×N3) = W1W ~ k W f,k H (a-1)

[0143] The first CJT CSI for layer l of the first TRP (best TRP) may be expressed by the following equation: W' l,i (N t ×N3) = W 2,i W1W ~ k W f,k H (a-2) W 2,i (1×1) or W 2,i (N t ×N t ), where i may be the index of the TRP / CMR / CMR group.

[0144] The base station uses W 2,i In this example, the base station updates the 4-TRP CJT CSI for layer l of TRP#i (i={2, 3, 4}) using the following formula: 2,i Using W' l,i may be updated. TIFF0007813871000001.tif23167

[0145] 《Report 2》 The matrix W2 for CSI / PMI between TRPs is W ~ k W f,k H may be transmitted together with W ~ k W f,k H The CSI / PMI w2 between TRPs may be communicated in accordance with at least one of the following reports 2a to 2b:

[0146] [Report 2a] For the second / third / fourth CJT CSI measurements, the FD basis and coefficients are common M across multiple TRPs. v (The common FD basis W f,k ) from the settings / instructed common M v From the first CJT CSI, the coefficient W for their TRP is measured jointly. ~ k may be jointly selected and reported in the CSI per TRP. The coefficient reporting may follow at least one of reports 2a-1 to 2a-2 below.

[0147] [[Report 2a-1]] Existing reports may be reused for coefficient reporting per TRP. That is, one strongest coefficient indicator (SCI) per TRP per layer may be reported. It may have amplitude=1 and phase=0 as a reference coefficient. Other coefficients per TRP per layer may be quantized based on that reference coefficient. The amplitude / phase difference between the strongest reference coefficient from the second / third / fourth TRP and the strongest reference coefficient from the first TRP may be additionally reported.

[0148] In the example of Figure 8, one SCI is reported per TRP per layer, and quantized per TRP. The amplitude / phase difference between the reference coefficient from the first TRP and the reference coefficients from the other TRPs may be additionally reported. In this example, the amplitude / phase of the SCI beam per TRP is not reported, but the amplitude / phase difference between the reference coefficient from the first TRP and the reference coefficients from the other TRPs is reported.

[0149] [[Report 2a-2]] For coefficient reporting across multiple (all) TRPs, one strongest coefficient indicator (SCI) per layer from all TRPs may be reported in the first TRP CSI, and other coefficients per TRP and per layer may be quantized based on this strongest coefficient. The strongest coefficient may have amplitude = 1 and phase = 0 as a reference coefficient. Other coefficients per TRP and per layer may be quantized based on this reference coefficient. Therefore, in the second / third / fourth TRP CSI, SCI reporting per TRP CSI may be unnecessary, and the amplitude / phase of the original SCI may be quantized and fed back based on the common SCI, as with other non-SCI beams. The original SCI per TRP may have amplitude = 1 and phase = 0 as a reference. Therefore, the amplitude / phase of the SCI per TRP may not be reported in report 2a-1.

[0150] In the example of Figure 9, one SCI may be reported per layer across all TRPs and quantized across all TRPs. In this example, the original SCI is not reported in the 2nd / 3rd / 4th TRP CSI, but the amplitude / phase of the original SCI beam per TRP may be reported.

[0151] [Report 2b] For the second / third / fourth CJT CSI measurements, the FD basis and coefficients are jointly measured with the first CJT CSI from the set larger FD basis. For each TRP, the main coefficients may be distributed within different FD bases for each TRP. In this case, for each TRP, a different M v,i At least one of the size and the different starting offsets within the FD basis may be reported. The reporting may be layer-specific for each TRP or common to multiple layers for each TRP. The coefficient reporting may follow at least one of reports 2b-1 to 2b-2 below.

[0152] [[Report 2b-1]] For per-TRP coefficient reporting, existing reports may be reused, i.e., per-TRP, per-layer, M v,i One strongest coefficient indicator (SCI) per TRP may be reported, which may have amplitude=1 and phase=0 as the reference coefficient. v,i The other coefficients for each TRP may be quantized based on their reference coefficients. The amplitude / phase difference between the strongest reference coefficient from the second / third / fourth TRP and the strongest reference coefficient from the first TRP may be additionally reported.

[0153] Per TRP, per layer, M v,i For each SCI, reporting of one SCI and quantization per TRP may be performed.

[0154] In the example of Figure 10, for TRP#i (i={1,2,3,4}), the number of FD bases (FD basis vector size) or less is set. v,i The UE may determine the starting offset of the number of FD bases to be selected. Among the configured FD bases, M v,i Using FD bases, W f,k , W ~ k For TRP#i, the number of SD beams (SD DFT vectors) L i For each TRP, SCI may be selected / reported from the selected FD basis and the configured SD beam.

[0155] [[Report 2b-2]] For coefficient reporting across multiple (all) TRPs, in the first TRP CSI, all M per layer from all TRPs are reported. v,iOne strongest coefficient indicator (SCI) across all TRPs may be reported, and other coefficients per TRP and per layer may be quantized based on this strongest coefficient. The strongest coefficient may have amplitude = 1 and phase = 0 as a reference coefficient. Other coefficients per TRP and per layer may be quantized based on the reference coefficient. Therefore, within the second / third / fourth TRP CSI, SCI reporting per TRP CSI may not be necessary, and the amplitude / phase of the original SCI may be quantized and fed back based on the common SCI, just like other non-SCI beams. v The reporting of coefficients for each TRP and the reporting of coefficients across multiple TRPs may be the same as in Report 2a-1 / 2a-2, except for the determination and reporting of coefficients for each TRP.

[0156] For each TRP, for each layer, all M v,i Reporting one SCI across all M v,i Quantization across the range may be performed.

[0157] M for each TRP v The size may be determined according to at least one of the following size determination methods 1 and 2. [Size determination method 1] M for each TRP (or common to all TRPs) v The size may be configured by RRC. The UE may v The starting offset of the [Size determination method 2] M of each TRP v The maximum size of M for each TRP may be specified in the specification or may be set by the RRC. The UE may determine the maximum size of M for each TRP based on the implementation (e.g., taking into account a good coefficient distribution). v The size may be determined.

[0158] Variations M v,i may be discontinuous. Therefore, the discontinuous M v,i In order to notify each M v,iIt may be necessary for the index of the FD basis for .times. ...

[0159] In Report 2, the inter-TRP PMI was ~ k W f,k H may be transmitted together with W ~ k W f,k H At least one of the inter-TRP CSIs of embodiments #A1 to #A6 may be applied to the inter-TRP PMI.

[0160] Report 2b shows a smaller TRP-specific M compared to Report 2a. v can be used to reduce the feedback overhead.

[0161] The UE reports 2a (M common to multiple TRPs) v ) and Report 2b (TRP-specific M v ) may be supported. Report 2a and Report 2b may be switched based on the number of FD bases / subbands, etc.

[0162] According to this embodiment, the UE can properly report CSI / PMI between TRPs.

[0163] <Embodiment #A1> This embodiment relates to CMR.

[0164] If a new parameter indicating the codebook type is configured (e.g., codebookType=TypeII-CJT-r18 or TypeII-PortSelection-CJT-r18), new CJT CSI feedback based on the existing Type II / Type II Port Selection may be configured. New UE capabilities for each new codebook type for CJT may be specified.

[0165] CMR configuration / instruction may follow any of options 1-1 to 1-3 below.

[0166] Option 1-1 The number of TRPs (CJT CSI numbers) may be explicitly configured as X, or may be implicitly indicated through the number of target resources (CMRs (CSI-RS resources) / CMR groups / CSI-RS resource sets) in the CSI reporting configuration (CSI-ReportConfig). A new UE capability for X may be specified. For example, X may be an integer up to 4, 2, 3, 4, or greater than 4.

[0167] In the CSI-ReportConfig for CJT CSI feedback, up to X target resources (CMRs (CSI-RS resources) / CMR groups / CSI-RS resource sets) may be configured for the first resource setting for channel measurement, and each target resource (CMRs (CSI-RS resources) / CMR groups / CSI-RS resource sets) may correspond to one TRP.

[0168] Preferably, X CSI-RS resources are used, and for X CMR groups / CSI-RS resource sets, an additional bitmap is needed to indicate the combined CMR from the X CMR groups / CSI-RS resource sets.

[0169] One CMR from the X CMRs may be measured and reported by the UE as the reference CSI. For example, the first CRI / CSI in the mapping order may be regarded as the reference CSI. Other CMRs may be measured taking into account inter-TRP difference based on the reference CSI.

[0170] 11, X = 4. Four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured for four TRPs, respectively.

[0171] [Variations] Up to N*X CMRs may be configured to allow for selection of different X-TRPs (X TRPs). Here, each of the X CMRs may correspond to a respective X TRP for CJT CSI. N combinations of X-TRPs may be measured and selected by the UE for CJT CSI. New UE capabilities for N may be specified. For example, N may be 1 or 2.

[0172] 12, N = 2 and X = 4. A combination of four CMRs (CSI-RS resources #1, #4, #5, #8) and another combination of four CMRs (CSI-RS resources #1, #4, #9, #11) are configured.

[0173] Option 1-2 Up to X CSI reporting configurations (CSI-ReportConfigs) may be configured and associated with the CJT CSI. Here, each CSI-ReportConfig may correspond to one TRP. Up to N CMRs may be configured for each CSI-ReportConfig. For example, N may be 1 or may be 2 or more.

[0174] The setting / instruction of the CMR may follow either of the following options 1-2-1 and 1-2-2.

[0175] [Option 1-2-1] One of the X CSI-ReportConfigs may be set as a reference CSI-ReportConfig, and the other X-1 CSI-ReportConfigs may be associated with the reference CSI-ReportConfig.

[0176] 13, four CSI-ReportConfigs (#1, #2, #3, #4) are configured for four TRPs. CSI-ReportConfig#1 is configured as the reference CSI-ReportConfig, and CSI-ReportConfigs#2, #3, #4 are associated with CSI-ReportConfig#1.

[0177] [Option 1-2-2] One CMR from one CSI-ReportConfig out of X CSI-ReportConfigs may be selected, and CSI based on it may be reported as reference CSI. Other CMRs from other CSI-ReportConfigs may be measured taking into account differences between TRPs based on the reference CSI. Within each CSI-ReportConfig, only one CMR may be configured for CJT CSI, and for each CSI-ReportConfig, a one-bit indicator of the reference CSI may be reported. The one-bit indicator may indicate whether the corresponding CSI is the reference CSI.

[0178] In the above-mentioned Option 1-1, one CSI-ReportConfig may be associated with multiple TRPs. One CSI-RS (CSI-RS resource / CMR) may be associated with one TRP. In the above-mentioned Option 1-2, one CSI-ReportConfig may be associated with one TRP.

[0179] Options 1-3 Within the CSI reporting configuration (CSI-ReportConfig) for CJT CSI feedback, one or more N-port CSI-RS resources may be configured for CJT CSI measurements. Here, one or more ports from the N-ports may correspond to one TRP. Some of the N-ports may correspond to one TRP, and other ports may correspond to another TRP. N may be greater than or equal to X.

[0180] For example, if one N-port CSI-RS resource is configured, the UE may measure all N ports and report one CSI. For example, the UE may measure all N ports, assuming that each port is transmitted by multiple TRPs. In this case, no CSI extension is required (TRPs are transparent to the UE), but a new QCL type for the CSI-RS resource may be required because the CSI-RS resource is transmitted by multiple TRPs instead of one TRP.

[0181] According to this embodiment, the UE can properly configure the CMR for CJT CSI feedback.

[0182] <Embodiment 2#A2> This embodiment relates to IMR.

[0183] For the CJT, it may be assumed that there is no inter-TRP interference. There may be only non-X TRP interference (interference from sources other than the X TRPs).

[0184] In the CSI reporting configuration (CSI-ReportConfig) for CJT CSI feedback, the same IMR (ZP CSI-RS resource) may be configured for the CMRs from the X TRPs, and interference other than the X TRPs may be measured based on the IMR.

[0185] The IMR setting / instruction may follow either of the following options 2-A and 2-B.

[0186] [Option 2-A] For X CMRs, only one IMR may be configured in the second resource setting, and the UE may assume that all CMRs apply.

[0187] In the example of Figure 14A, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 above. Furthermore, one IMR (ZP CSI-RS resource #2) is configured in the second resource setting for one CMR in the CSI-ReportConfig. The UE applies the one IMR to the four CMRs.

[0188] [Option 2-B] The one-to-one CMR-IMR mapping configuration framework is maintained, but for each CMR, the same IMR resource may be configured in the second resource setting, and the UE may assume that for each CMR, the same IMR resource is configured in the second resource setting, and may correspond to a CMR in the first resource setting.

[0189] In the example of Figure 14B, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 above. Furthermore, the same IMR (ZP CSI-RS resource #2) is configured in the second resource setting for each CMR in the CSI-ReportConfig. The UE applies the corresponding IMR to each CMR.

[0190] According to this embodiment, the UE can properly configure the IMR for CJT CSI feedback.

[0191] <Embodiment #A3> This embodiment relates to the codebook / CSI.

[0192] In the above Option 1-1, if X TRP CMRs are configured in one CSI-ReportConfig, the CSI in one CSI report may follow any of the following Options 3-A to 3-D.

[0193] Option 3-A The CSI report may include at least one of the following CJT CSI: The number of CJT CSI may be less than four or more than five. The first CJT CSI may include the existing single TRP CSI and CRI for the first TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set. The second CJT CSI may include the existing single-TRP CSI and CRI for the second TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one index of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be based on a comparison with the first CJT CSI. The third CJT CSI may include the existing single-TRP CSI and CRI for the third TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one index of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be based on a comparison with the first CJT CSI. The fourth CJT CSI may include the existing single-TRP CSI and CRI for the fourth TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one index of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be based on a comparison with the first CJT CSI.

[0194] The i-th (i≧2) CJT CSI may include an index based on a comparison of the 1st CJT CSI and the i-th CJT CSI.

[0195] The CRI index of the first CJT CSI may be selected by the UE from X CMRs and reported with a bit size of log2(X), and the CRI index may be the reference CSI with the best channel condition.

[0196] Using this CSI, the base station can update the CJT CSI of the 2-TRP, 3-TRP, and 4-TRP with the reference TRP for dynamic scheduling.

[0197] In the example of Figure 15, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 above. The CSI report includes the first to fourth CJT CSIs. The first CJT CSI includes a CRI based on CSI-RS resource #1 and a single-TRP CSI as the reference CSI. The second CJT CSI includes a CRI and single-TRP CSI based on CSI-RS resource #4 and an amplitude / phase index between TRPs based on the reference CSI (the single-TRP CSI of CSI-RS resource #1). The third CJT CSI includes a CRI and single-TRP CSI based on CSI-RS resource #5 and an amplitude / phase index between TRPs based on the reference CSI (the single-TRP CSI of CSI-RS resource #1). The fourth CJT CSI includes CRI and single-TRP CSI based on CSI-RS resource #8 and an amplitude / phase index between TRPs based on reference CSI (single-TRP CSI of CSI-RS resource #1).

[0198] 16 shows an example of a novel codebook for at least one of an inter-TRP phase index, an inter-TRP amplitude index, and an inter-TRP coefficient index (including both amplitude and phase). 3,1 denotes the inter-TRP phase index (compared to the reference CSI / TRP) as new CSI information for the CJT CSI. PMI index i 3,2 indicates the inter-TRP amplitude index (compared to the reference CSI / TRP) as new CSI information for the CJT CSI. PMI index i3 indicates the inter-TRP coefficient index (compared to the reference CSI / TRP) as new CSI information for the CJT CSI.

[0199] Option 3-B The CSI report may include at least one of the following CJT CSI: The number of CJT CSI may be less than four or more than five. The first CJT CSI may include the existing single TRP CSI and CRI for the first TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set. The second CJT CSI may include the existing single-TRP CSI and CRI for the second TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one index of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be based on a comparison with the first CJT CSI. The third CJT CSI may include the existing single-TRP CSI and CRI for the third TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be at least one of an index based on a comparison with the first CJT CSI and an index based on a comparison with the second CJT CSI. The fourth CJT CSI may include the existing single-TRP CSI and CRI for the fourth TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one of an inter-TRP phase index from an inter-TRP phasing matrix, an inter-TRP amplitude index from an inter-TRP amplitude matrix, and a single inter-TRP coefficient index from an inter-TRP coefficient matrix, which may be at least one of an index based on a comparison with the first CJT CSI, an index based on a comparison with the second CJT CSI, and an index based on a comparison with the third CJT CSI.

[0200] The i (i≧2)th CJT CSI may include an index based on a comparison of the 1st through the i−1th CJT CSIs.

[0201] The CRI index of the first CJT CSI may be selected by the UE from X CMRs and reported with a bit size of log2(X). The CRI index may be the reference CSI with the best channel condition. The CRI index of the second CJT CSI may be the second-best CSI. The CRI index of the third CJT CSI may be the third-best CSI. The CRI index of the fourth CJT CSI may be the fourth-best CSI.

[0202] Compared with Option 3-A, in Option 3-B, the base station can update any CJT CSI of 2-TRP, 3-TRP, or 4-TRP with a reference TRP for dynamic scheduling.

[0203] In the example of Figure 17, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 above. The CSI report includes the first to fourth CJT CSIs. The first CJT CSI includes a CRI based on CSI-RS resource #1 and a single-TRP CSI as the reference CSI. The second CJT CSI includes a CRI and single-TRP CSI based on CSI-RS resource #4, and an amplitude / phase index between TRPs based on the reference CSI (the single-TRP CSI of CSI-RS resource #1). The third CJT CSI includes a CRI and single-TRP CSI based on CSI-RS resource #5, an amplitude / phase index between TRPs based on the reference CSI (the single-TRP CSI of CSI-RS resource #1), and an amplitude / phase index between TRPs based on the single-TRP CSI of CSI-RS resource #4. The fourth CJT CSI includes CRI and single-TRP CSI based on CSI-RS resource #8, amplitude / phase indices between TRPs based on reference CSI (single-TRP CSI of CSI-RS resource #1), amplitude / phase indices between TRPs based on single-TRP CSI of CSI-RS resource #4, and amplitude / phase indices between TRPs based on single-TRP CSI of CSI-RS resource #5.

[0204] 18 shows an example of a novel codebook for at least one of an inter-TRP phase index, an inter-TRP amplitude index, and an inter-TRP coefficient index (including both amplitude and phase). 3,1 denotes the inter-TRP phase index (compared to the reference CSI / TRP) as new CSI information for the CJT CSI. PMI index i 3,2 denotes the inter-TRP amplitude index (compared to the reference CSI / TRP) as new CSI information for the CJT CSI. PMI index i 3,3denotes the inter-TRP phase index (compared to the second reported CSI / TRP) as new CSI information for the CJT CSI. PMI index i 3,4 denotes the TRP amplitude index (compared to the second reported CSI / TRP) as new CSI information for the CJT CSI. PMI index i 3,5 denotes the inter-TRP phase index (compared to the third reported CSI / TRP) as new CSI information for the CJT CSI. PMI index i 3,6 indicates the TRP-to-TRP amplitude index (compared to the third reported CSI / TRP) as new CSI information for the CJT CSI.

[0205] Option 3-C Based on Option 3-A / 3-B above, at least one of the following additional contents may be reported for the second / third / fourth CJT contents: The number of CJT CSIs may be less than four or more than five. The second CJT CSI may further include a CQI (2-TRP CQI) assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the second CJT CSI (the CMR for the first CJT CSI and the CMR for the second CJT CSI). The third CJT CSI may further include at least one of a CQI assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the third CJT CSI (CMR for the first CJT CSI and CMR for the third CJT CSI), and a CQI (3-TRP CQI) assuming a 3-TRP CJT of the CRI in the first CJT CSI, the CRI in the second CJT CSI and the CRI in the third CJT CSI (CMR for the first CJT CSI, CMR for the second CJT CSI and CMR for the third CJT CSI). The fourth CJT CSI may further include at least one of a CQI assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the fourth CJT CSI (CMR for the first CJT CSI, CMR for the fourth CJT CSI, and CMR for the second CJT CSI), and a CQI (4-TRP CQI) assuming a 4-TRP CJT of the CRI in the first CJT CSI, CRI in the second CJT CSI, CRI in the third CJT CSI, and CRI in the fourth CJT CSI (CMR for the first CJT CSI, CMR for the second CJT CSI, CMR for the third CJT CSI, and CMR for the fourth CJT CSI).

[0206] The i-th (i≧2) CJT CSI may include CQI assuming the 1st to i-th i-TRP CJTs.

[0207] A new CQI (X-TRP CQI) report may be defined for at least one of a 2-TRP CJT (one TRP is a reference TRP / CSI), a 3-TRP CJT (one TRP is a reference TRP / CSI), and a 4-TRP CJT (one TRP is a reference TRP / CSI).

[0208] Whether or not a new X-TRP CQI is reported in the X-TRP CJT CSI may be configured in the RRC IE (CSI-ReportConfig).

[0209] [Variations] An additional new X-TRP CQI may not be reported, and instead, an existing single-TRP CQI may be reported within each CJT CSI. An X-TRP CJT may be a CJT that includes CMR / TRP reported in up to the i-th CJT CSI. For example, a 4-TRP CJT may be a CJT that includes CMR / TRP reported in up to the i-th CJT CSI.

[0210] In the example of Figure 19, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 above. The CSI report includes the first to fourth CJT CSI. The first CJT CSI includes a CRI based on CSI-RS resource #1 and a single-TRP CSI as the reference CSI. The second CJT CSI includes a CRI based on CSI-RS resource #4 and a single-TRP CSI, and the single-TRP CQI may be replaced with a 2-TRP CQI (based on CSI-RS resources #1 and #4). The third CJT CSI includes a CRI based on CSI-RS resource #5 and a single-TRP CSI, and the single-TRP CQI may be replaced with a 3-TRP CQI (based on CSI-RS resources #1, #4, and #5). The fourth CJT CSI includes a CRI and single-TRP CSI based on CSI-RS resource #8, and the single-TRP CQI may be replaced with a 4-TRP CQI (based on CSI-RS resources #1, #4, #5, and #8).

[0211] Option 3-D Based on the above Option 3-A / 3-B, at least one of the following additional contents may be reported for the second / third / fourth CJT contents: The number of CJT CSIs may be less than 4 or more than 5. The i-th CJT CSI may be based on the i-1st CJT CSI as well as the i-1st CJT CSI. The second CJT CSI may further include a CQI (2-TRP CQI) assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the second CJT CSI (the CMR for the first CJT CSI and the CMR for the second CJT CSI). The third CJT CSI may further include at least one of a CQI assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the third CJT CSI (CMR for the first CJT CSI and CMR for the third CJT CSI), a CQI assuming a 2-TRP CJT of the CRI in the second CJT CSI and the CRI in the third CJT CSI (CMR for the second CJT CSI and CMR for the third CJT CSI), and a CQI (3-TRP CQI) assuming a 3-TRP CJT of the CRI in the first CJT CSI, the CRI in the second CJT CSI and the CRI in the third CJT CSI (CMR for the first CJT CSI, CMR for the second CJT CSI and CMR for the third CJT CSI). The fourth CJT CSI further includes the CQI assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the fourth CJT CSI (CMR for the first CJT CSI, CMR for the fourth CJT CSI, and CMR for the second CJT CSI), the CQI assuming a 2-TRP CJT of the CRI in the second CJT CSI and the CRI in the fourth CJT CSI (CMR for the second CJT CSI, CMR for the fourth CJT CSI, and CMR for the second CJT CSI), the CQI assuming a 2-TRP CJT of the CRI in the third CJT CSI and the CRI in the fourth CJT CSI (CMR for the third CJT CSI, CMR for the fourth CJT CSI, and CMR for the second CJT CSI), and the CQI assuming a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the second CJT CSI. CQI assuming a 3-TRP CJT of CRI within a CSI and CRI within the fourth CJT CSI (CMR for the first CJT CSI, CMR for the second CJT CSI, and CMR for the fourth CJT CSI), CQI assuming a 3-TRP CJT of CRI within the first CJT CSI, CRI within the third CJT CSI, and CRI within the fourth CJT CSI (CMR for the first CJT CSI, CMR for the third CJT CSI, and CMR for the fourth CJT CSI), CQI assuming a 3-TRP CJT of CRI within the second CJT CSI, CRI within the third CJT CSI, and CRI within the fourth CJT CSI (CMR for the second CJT CSI, CMR for the third CJT CSI, and CMR for the fourth CJT CSI), CQI assuming a 3-TRP CJT of CRI within the second CJT CSI, CRI within the third CJT CSI, and CRI within the fourth CJT CSI (CMR for the second CJT CSI, CMR for the third CJT CSI, and CMR for the fourth CJT CSI), and a CQI (4-TRP CQI) assuming 4-TRP CJT of CRI in the first CJT CSI, CRI in the third CJT CSI, and CRI in the fourth CJT CSI (CMR for the first CJT CSI, CMR for the second CJT CSI, CMR for the third CJT CSI, and CMR for the fourth CJT CSI).

[0212] The i-th (i≧2) CJT CSI may include a CQI assuming a j-TRP (2≦j≦i)-TRP CJT using at least two of the first to i-th CJTs.

[0213] New CQI (X-TRP CQI) reporting for at least one of 2-TRP CJT (with / without indication of two TRPs), 3-TRP CJT (with / without indication of three TRPs), and 4-TRP CJT may be defined.

[0214] In the example of Figure 20, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured in the CSI-ReportConfig according to Option 1-1 above. The CSI report includes the first to fourth CJT CSI. The first CJT CSI includes a CRI based on CSI-RS resource #1 and a single-TRP CSI as reference CSI. The second CJT CSI includes a CRI and a single-TRP CSI based on CSI-RS resource #4 and a 2-TRP CQI (based on CSI-RS resources #1 and #4). The third CJT CSI includes a CRI and a single-TRP CSI based on CSI-RS resource #5 and a 2-TRP CQI / 3-TRP CQI. The fourth CJT CSI includes CRI and single-TRP CSI based on CSI-RS resource #8, and 2-TRP CQI / 3-TRP CQI / 4-TRP CQI.

[0215] Whether or not a new X-TRP CQI is reported in the X-TRP CJT CSI may be configured in the RRC IE (CSI-ReportConfig).

[0216] In the above Option 1-2, for X associated CSI-ReportConfigs, one CSI report may correspond to each CSI-ReportConfig. In this case, Option 3-A / 3-B / 3-C / 3-D may be applied with the following differences: The first / second / third / fourth CJT CSI content in Option 3-A / 3-B / 3-C / 3-D may be reported in separate CSI reports for the corresponding CSI-ReportConfig. In this case, CRI reporting may not be required in each CSI report. Within each CSI report, the reference CSI indicator may be explicitly indicated along with the new content of one CJT CSI. For CSI reports with reference CSI indicator = true / yes, the content of the first CJT CSI may be reported. For other CSI reports with reference CSI indicator = false / no, the content of the second / third / fourth CJT CSI may be reported.

[0217] According to this embodiment, the UE can properly report the CJT CSI.

[0218] <Embodiment #A4> This embodiment relates to codebook / CSI / quantization.

[0219] A new codebook table (quantization table) for new report content in embodiment #A3 may be defined.

[0220] For the inter-TRP amplitude codebook, a new table may be defined or an existing table (e.g., Figure 1 / Figure 2) may be reused. Figure 21 shows an example of a new table for the inter-TRP amplitude codebook. For example, when M=3, 2 bits are used for the indication / reporting, and 4 values ​​can be indicated / reported. For example, when M=4, 3 bits are used for the indication / reporting, and 8 values ​​can be indicated / reported.

[0221] For the inter-TRP phase codebook, a new table may be defined or an existing table (e.g., Figure 1 / Figure 2) may be reused. Figure 22 shows an example of a new table for the inter-TRP phase codebook. For example, when P=4, 2 bits are used for the indication / reporting, and 4 values ​​can be indicated / reported. For example, when P=8, 3 bits are used for the indication / reporting, and 8 values ​​can be indicated / reported. The range of [0, 2π) for indicating / reporting the phase may be divided into P parts (φ l,i = exp(j2πc i / P),c i ∈{0,...,P-1}).

[0222] A new table may be defined for the inter-TRP coefficient codebook (inter-TRP codebook). Figure 23 shows an example of the new table for the inter-TRP coefficient codebook. Each value may include both amplitude and phase.

[0223] According to this embodiment, the UE can appropriately quantize the CJT CSI.

[0224] <Embodiment #A5> This embodiment relates to CSI part 1 / 2 and mapping order.

[0225] In the above Option 1-1, a separation between CSI Part 1 and CSI Part 2 may be specified for new CJT CSI reporting for one TRP for one CSI-ReportConfig.

[0226] The X-TRP CQI may be in either CSI Part 1 or CSI Part 2.

[0227] A new mapping order table of one or more CSI fields of one CSI report for CSI Part 1 and a new mapping order table of one or more CSI fields of one CSI report for CSI Part 2 may be defined. For example, the CRI may be at the beginning of Part 1. The inter-TRP coefficient (phase / amplitude) index may be at the end of Part 2.

[0228] The mapping order of one or more CSI fields in CSI Part 1 for CJT CSI for one TRP may be as follows: CRI (if reported) Reference CSI indicator (if reported) Rank Indicator (RI) Channel Quality Indicator (CQI) (based on configuration, single-TRP CQI or X-TRP CQI) Number of non-zero amplitude coefficients

[0229] This CSI Part 1 may have a fixed payload size.

[0230] The mapping order of one or more CSI fields in CSI Part 2 for CJT CSI for one TRP may be as follows: Oversampling factor Multiple indices of 2D-DFT basis (SD vector) Index M of the initial DFT basis (FD basis) of the selected DFT window initial -Selected DFT basis (FD basis) for each layer Bitmap per layer Non-zero LC coefficients (phase and amplitude) per layer - Strongest coefficient indicator for each layer Amplitude of the strongest coefficient per layer / per polarization Layer-to-layer (per polarization) inter-TRP amplitude index (if reported) Per-layer (per-polarization) inter-TRP phase index (if reported) Layer-by-layer (per polarization) inter-TRP coefficient index (if reported) Additional X-TRP CQI (if reported) (may be in CSI Part 1)

[0231] The first / second / third / fourth CJT CSI content may be in one CSI report.

[0232] CSI reporting may follow either of Options 5-1 and 5-2 below.

[0233] [Option 5-1] CSI Part 1 for each of the first / second / third / fourth CJT CSI may include the content of the aforementioned "one CSI Part 1 for CJT CSI for one TRP." CSI Part 2 for each of the first / second / third / fourth CJT CSI may include the content of the aforementioned "one CSI Part 2 for CJT CSI for one TRP."

[0234] 24A shows an example of CSI Parts 1 and 2 for 4-TRP CJT CSI. In accordance with the above-mentioned "one CSI Part 1 for CJT CSI for one TRP," CSI Part 1 for the first TRP (CJT CSI), CSI Part 1 for the second TRP (CJT CSI), CSI Part 1 for the third TRP (CJT CSI), and CSI Part 1 for the fourth TRP (CJT CSI) are reported. In accordance with the above-mentioned "one CSI Part 2 for CJT CSI for one TRP," CSI Part 2 for the first TRP (CJT CSI), CSI Part 2 for the second TRP (CJT CSI), CSI Part 2 for the third TRP (CJT CSI), and CSI Part 2 for the fourth TRP (CJT CSI) are reported.

[0235] [Option 5-2] CSI Part 1 may include the content of the above-mentioned "One CSI Part 1 for CJT CSI for one TRP" for the reference (first) CJT CSI. CSI Part 2 may include other content.

[0236] Figure 24B shows an example of CSI parts 1 and 2 for 4-TRP CJT CSI. CSI part 1 for the first TRP (CJT CSI) is reported in accordance with the above-mentioned "one CSI part 1 for CJT CSI for one TRP." CSI part 2 for the first TRP (CJT CSI) is reported in accordance with the above-mentioned "one CSI part 2 for CJT CSI for one TRP." CSI parts 1 and 2 for the second TRP (CJT CSI), CSI parts 1 and 2 for the third TRP (CJT CSI), and CSI parts 1 and 2 for the fourth TRP (CJT CSI) are reported in accordance with the above-mentioned "one CSI part 1 for CJT CSI for one TRP" and "one CSI part 2 for CJT CSI for one TRP."

[0237] In a new mapping order table for one or more CSI fields of one CSI report for CSI part 1 / 2, the CSI may be placed in the order of TRP (first CJT CSI, second CJT CSI, third CJT CSI, fourth CJT CSI).

[0238] According to this embodiment, the UE can properly report the CJT CSI.

[0239] <Embodiment 6> This embodiment relates to CSI Part 2.

[0240] For the above "one CSI Part 2 for CJT CSI for one TRP", the grouping of CSI Part 2 (based on the above Groups 0 / 1 / 2) may follow either of Options 6-1 and 6-2 below.

[0241] [Option 6-1] New indices of amplitude / phase / coefficient between TRPs may be placed in Group 2.

[0242] For example, the above group 2 may be modified as follows: Group 2:i 1,7,l The lowest (lowest) floor (K NZ / 2) priority elements, i 2,4,l The lowest (lowest) floor (K NZ / 2) priority elements, i 2,5,l The lowest (lowest) floor (K NZ / 2) priority elements (l=1,...,v), amplitude / phase / coefficient indices between TRPs for each layer

[0243] [Option 6-2] A new group 3 may be introduced. New indices for amplitude / phase / coefficients between TRPs may be placed in group 3. In CSI omission, group 3 may have a lower priority than group 2.

[0244] For example, in addition to the above-mentioned groups 0 to 2, the following group 3 may be defined. Group 3: Amplitude / phase / coefficient index between TRPs per layer

[0245] If the X-TRP CQI is in CSI Part 2, the X-TRP CQI may be placed in Group 0 or 1, which has a higher priority.

[0246] In the above Option 5-2 "CSI Parts 1 and 2 for 4-TRP CJT CSI," the contents of the original CSI Part 1 for the CJT CSI for one TRP (the second / third / fourth CJT CSI) are in CSI Part 2. The contents of the original CSI Part 1 may be placed in Group 0 in CSI Part 2.

[0247] If Group 3 is introduced, the priority reporting level for Part 2 CSI may change.

[0248] The relationship between CSI Part 2 priority and the CSI Part 2 mapping order table may be as follows: Rep may be the number of CSI reports. Priority 0: CSI Reports 1 to N Rep Group 0 CSI for CSI reporting configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 wideband CSI for CSI reporting configured as other Priority 1: Group 1 CSI for CSI Report 1 if configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI for even-numbered subbands for CSI Report 1 if configured as anything else Priority 2: Group 2 CSI for CSI Report 1 if configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI for odd-numbered subbands for CSI Report 1 if configured as anything else Priority 3: Group 3 CSI for CSI Report 1 if configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI for odd-numbered subbands for CSI Report 1 if configured as anything else Priority 4: Group 1 CSI for CSI report 2 if configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI for even-numbered subbands for CSI report 1 if configured as anything else Priority 5: Group 2 CSI for CSI report 2 if configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI for odd-numbered subbands for CSI report 1 if configured as anything else Priority 6: Group 3 CSI for CSI Report 2 if configured as 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18'; Part 2 subband CSI for odd-numbered subbands for CSI Report 1 if configured as anything else Priorities 7 and above may be specified according to the same rules as priorities 1 to 6.

[0249] For priorities 1 to 3, if set to 'xx-CJT-r18', the mapping order of CSI in groups 1 to 3 for CSI report 1 may follow either mapping order 1 or 2 below.

[0250] [Mapping order 1] Group 1 CSI for CSI Report 1 for TRP of 1st CJT CSI Group 1 CSI for CSI Report 1 for TRP of 2nd CJT CSI Group 1 CSI for CSI Report 1 for TRP of 3rd CJT CSI Group 1 CSI for CSI Report 1 for TRP of 4th CJT CSI Group 2 CSI for CSI Report 1 for TRP of 1st CJT CSI Group 2 CSI for CSI Report 1 for TRP of 2nd CJT CSI Group 2 CSI for CSI Report 1 for TRP of 3rd CJT CSI Group 2 CSI for CSI Report 1 for TRP of 4th CJT CSI Group 3 CSI for CSI Report 1 for TRP of 1st CJT CSI Group 3 CSI for CSI Report 1 for TRP of 2nd CJT CSI Group 3 CSI for CSI Report 1 for TRP of 3rd CJT CSI Group 3 CSI for CSI Report 1 for TRP of 4th CJT CSI

[0251] [Mapping order 2] Group 1 CSI for CSI Report 1 for TRP of 1st CJT CSI Group 2 CSI for CSI Report 1 for TRP of 1st CJT CSI Group 3 CSI for CSI Report 1 for TRP of 1st CJT CSI Group 1 CSI for CSI Report 1 for TRP of 2nd CJT CSI Group 2 CSI for CSI Report 1 for TRP of 2nd CJT CSI Group 3 CSI for CSI Report 1 for TRP of 2nd CJT CSI Group 1 CSI for CSI Report 1 for TRP of 3rd CJT CSI Group 2 CSI for CSI Report 1 for TRP of 3rd CJT CSI Group 3 CSI for CSI Report 1 for TRP of 3rd CJT CSI Group 1 CSI for CSI Report 1 for TRP of 4th CJT CSI Group 2 CSI for CSI Report 1 for TRP of 4th CJT CSI Group 3 CSI for CSI Report 1 for TRP of 4th CJT CSI

[0252] According to this embodiment, the UE can properly report the CJT CSI.

[0253] <Other embodiments> 《UE capability information / upper layer parameters》 Higher layer parameters (RRC IEs) / UE capabilities corresponding to the functions (features) in each of the above embodiments may be defined. The higher layer parameters may indicate whether the functions are enabled. The UE capabilities may indicate whether the UE supports the functions.

[0254] A UE for which higher layer parameters corresponding to the function are configured may perform the function. It may also be specified that "a UE for which higher layer parameters corresponding to the function are not configured shall not perform the function (for example, in accordance with Rel. 15 / 16)."

[0255] A UE that reports / transmits a UE capability indicating that it supports the function may perform the function. It may also be specified that "a UE that does not report a UE capability indicating that it supports the function shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0256] If the UE reports / transmits a UE capability indicating that it supports the function and the corresponding upper layer parameter is configured, the UE may perform the function. It may also be specified that "if the UE does not report / transmit a UE capability indicating that it supports the function or if the corresponding upper layer parameter is not configured, the UE shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0257] Which embodiment / option / choice / function of the above multiple embodiments is used may be configured by higher layer parameters, may be reported by the UE as a UE capability, may be specified in a specification, or may be determined by the reported UE capability and the configuration of higher layer parameters.

[0258] The UE capabilities may indicate whether the UE supports at least one of the following functions: Reporting of inter-TRP amplitudes. One or more multiple codebooks with different quantization granularities. Inter-TRP phase reporting. One or more multiple codebooks with different quantization granularity. Reporting of inter-TRP (including both amplitude and phase) coefficients. One or more multiple codebooks with different quantization granularity. · Reporting of reference CSI indicators. · Reporting of X-TRP CQI (aggregated CJT CQI). Reporting of X-TRP CQI instead of single TRP CQI. Reporting of X-TRP CQI in addition to single TRP CQI. Reporting of X-TRP indications such as X-TRP CQI. ·For CJT CSI, common M for multiple TRPs v Supports or TRP specific M v Do you support ·CJT CSI for the same M v Use size. ·CJT CSI vs. different M v Use size. · Use a starting offset for each TRP report for CJT CSI. ·CJT CSI vs. continuous M v Supports discontinuous M v Do you support For CJT CSI, for each TRP, layer-specific M v To use. For CJT CSI, for each TRP, M common to multiple layers v To use.

[0259] The UE capability may indicate at least one of the following values: X-TRP The value of X in CJT. X-TRP The maximum value of X in CJT.

[0260] The above UE capabilities / upper layer parameters allow the UE to achieve the above functions while maintaining compatibility with existing specifications.

[0261] (wireless communication system) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0262] 25 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0263] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0264] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0265] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0266] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0267] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0268] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR2.

[0269] Furthermore, the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0270] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0271] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0272] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0273] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0274] The radio access scheme may also be called a waveform. Note that 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 UL and DL radio access schemes.

[0275] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0276] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0277] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0278] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0279] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0280] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0281] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0282] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0283] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0284] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted as DL-RS.

[0285] 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 the SS (PSS, SSS) and the PBCH (and DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as reference signals.

[0286] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0287] (base station) 26 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0288] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0289] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0290] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0291] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0292] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0293] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0294] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0295] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0296] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0297] The transceiver 120 (transmission processor 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0298] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0299] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0300] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0301] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0302] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0303] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0304] The transceiver 120 may transmit a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission, and the controller 110 may control reception of measurement reports for the X channel measurement resources based on the configuration.

[0305] The transceiver 120 may transmit a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission. The controller 110 may control, based on the configuration, reception of a CSI report including X channel state information (CSI) corresponding to the X channel measurement resources, respectively.

[0306] The transceiver 120 may transmit a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission. The controller 110 may control reception of channel state information (CSI) part 1 and CSI part 2 reports based on the configuration.

[0307] The transceiver 120 may transmit a single CSI report configuration including multiple channel state information (CSI) corresponding to multiple transmission and reception points for coherent joint transmission. The controller 110 may control reception of the single CSI report.

[0308] The transceiver 120 may transmit a channel state information (CSI) report configuration including CSI between multiple transmitting and receiving points for coherent joint transmission. The controller 110 may control reception of the CSI report.

[0309] (user terminal) 27 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0310] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0311] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0312] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.

[0313] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0314] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0315] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0316] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0317] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0318] The transceiver 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0319] The transceiver 220 (transmission processor 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0320] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0321] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0322] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0323] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0324] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0325] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0326] The transceiver 220 may receive a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission, and the controller 210 may control reporting of measurements on the X channel measurement resources based on the configuration.

[0327] The configuration may indicate at least one of X and X channel state information reporting configurations.

[0328] The configuration may indicate a plurality of channel state information reference signal ports.

[0329] The configuration may indicate 1 or X interference measurement resources.

[0330] The transceiver 220 may receive a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission. The controller 210 may control a CSI report including X channel state information (CSI) corresponding to the X channel measurement resources based on the configuration.

[0331] Each of the X CSIs may include a channel state information reference signal (CSI-RS) resource indicator (CRI) indicating a corresponding channel measurement resource, and CSI based on the corresponding channel measurement resource.

[0332] Each of the X CSIs may include an index indicating a difference in at least one of phase and amplitude between multiple TRPs.

[0333] i may be 2 or greater, and the i-th CSI may include an index indicating a difference in at least one of phase and amplitude between at least two of the 1st to i-1th channel measurement resources.

[0334] The transceiver 220 may receive a configuration indicating X channel measurement resources for X transmission / reception points (TRPs) for coherent joint transmission. The controller 210 may control reporting of channel state information (CSI) Part 1 and CSI Part 2 based on the configuration.

[0335] CSI Part 1 for one of the X TRPs may include at least one of a Channel State Information Reference Signal (CSI-RS) Resource Indicator (CRI) indicating a corresponding channel measurement resource and a reference CSI indicator indicating one of the X channel measurement resources.

[0336] CSI Part 2 for one of the X TRPs may include at least one of an index indicating a difference in at least one of phase and amplitude between multiple TRPs for at least one of a layer and a polarization, and a channel quality indicator (CQI) based on the X TRPs.

[0337] The index may be included in group 2 of groups 0 to 2, or in group 3 after group 2.

[0338] The controller 210 may determine a plurality of channel state information (CSI) corresponding to a plurality of transmitting and receiving points for coherent joint transmission, and the transceiver 220 may transmit a single CSI report including the plurality of CSI.

[0339] The plurality of CSIs may be based on at least one constraint of a rank indicator (RI), parameters for the plurality of CSIs, a maximum number of non-zero coefficients, a maximum number of spatial domain beams, and a maximum number of spatial domain vector sizes.

[0340] 3. The terminal according to claim 1, wherein the control unit selects a best result from measurement results corresponding to one of the plurality of transmission and reception points, and determines the plurality of CSIs based on the best result.

[0341] The control unit 210 may determine the multiple CSIs assuming coherent joint transmission using the multiple transmission and reception points.

[0342] The control unit 210 may cause the transceiver unit 220 to determine channel state information (CSI) between multiple transmitting and receiving points for coherent joint transmission. The transceiver unit 220 may transmit a CSI report including the CSI.

[0343] The CSI report may include CSI corresponding to one transmission / reception point among a plurality of transmission / reception points.

[0344] The controller 210 may select a plurality of best measurement results corresponding to each of the plurality of transmission and reception points, and determine the CSI based on the plurality of best measurement results.

[0345] The controller 210 may select a best measurement result corresponding to one of the plurality of transmission and reception points and determine the CSI based on the best measurement result.

[0346] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0347] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As mentioned above, the implementation method of each is not particularly limited.

[0348] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 28 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0349] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0350] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0351] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0352] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0353] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0354] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0355] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0356] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0357] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0358] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0359] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0360] (Variation) Note that terms explained in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0361] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0362] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0363] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0364] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0365] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0366] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0367] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0368] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0369] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0370] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0371] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0372] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0373] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0374] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0375] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0376] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0377] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0378] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0379] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0380] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0381] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0382] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0383] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0384] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0385] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0386] Note that the physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be called an RRC message, such as an RRC connection setup message or an RRC connection reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0387] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0388] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0389] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0390] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0391] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0392] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0393] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0394] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0395] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0396] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0397] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0398] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0399] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0400] 29 is a diagram showing an example of a vehicle according to an embodiment. Vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0401] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0402] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (e.g., an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0403] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0404] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0405] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0406] The driving assistance system unit 64 is configured with various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), Artificial Intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0407] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0408] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the above-mentioned base station 10 or user terminal 20. Furthermore, the communication module 60 may be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (or may function as at least one of the base station 10 and user terminal 20).

[0409] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0410] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0411] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0412] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as uplink channel and downlink channel may be read as sidelink channel.

[0413] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0414] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0415] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the specific order presented.

[0416] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. It may also be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0417] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0418] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0419] The term "determining," as used in this disclosure, may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0420] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0421] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0422] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0423] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0424] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0425] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0426] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0427] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0428] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0429] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a controller for determining a plurality of channel state information (CSI) signals corresponding to a plurality of transmission / reception points (TRPs) for coherent joint transmission; a transmitter for transmitting a CSI report including the plurality of CSIs; A terminal in which at least one of a maximum number of non-zero coefficients for each layer of the plurality of TRPs and a maximum number of non-zero coefficients for all layers of the plurality of TRPs is set based on information regarding the CSI report.

2. The terminal described in claim 1, wherein the control unit controls to include a common rank indicator (RI) in the CSI report.

3. A terminal as described in claim 1, wherein a combination of parameters for the CSI reporting sets parameters common to the multiple TRPs and parameters specific to the multiple TRPs.

4. determining a plurality of channel state information (CSI) respectively corresponding to a plurality of transmission / reception points (TRPs) for coherent joint transmission; transmitting a CSI report including the plurality of CSIs; A wireless communication method for a terminal, in which at least one of a maximum number of non-zero coefficients for each layer of the plurality of TRPs and a maximum number of non-zero coefficients for all layers of the plurality of TRPs is set based on information regarding the CSI report.

5. a transmitter for transmitting information related to a CSI report, the CSI report including a plurality of pieces of channel state information (CSI) corresponding to a plurality of transmission / reception points (TRPs) for coherent joint transmission; a control unit for controlling reception of the CSI report; A base station, wherein at least one of a maximum number of non-zero coefficients for each layer of the plurality of TRPs and a maximum number of non-zero coefficients for all layers of the plurality of TRPs is set based on information regarding the CSI report.

6. A system having a terminal and a base station, The terminal includes: a controller for determining a plurality of channel state information (CSI) corresponding to a plurality of transmission / reception points (TRPs) for coherent joint transmission; a transmitter for transmitting a CSI report including the plurality of CSIs; The base station includes a transmitter for transmitting information regarding the CSI report; a control unit for controlling reception of the CSI report; A system in which at least one of a maximum number of non-zero coefficients for each layer of the plurality of TRPs and a maximum number of non-zero coefficients for all layers of the plurality of TRPs is set based on information regarding the CSI report.

Images