Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to an aspect of the present disclosure comprises: a reception unit that receives a setting that indicates X channel measurement resources with respect to X transmission / reception points (TRPs) for coherent joint transmissions; and a control unit that controls reporting of a channel state information (CSI) part 1 and CSI part 2 on the basis of said setting. According to an aspect of the present disclosure, CSI reporting for CJT can be appropriately performed.

Description

[Technical Field]

[0001] This disclosure relates to terminals and wireless communication methods in next-generation mobile communication systems. 、 base station and system Regarding. [Background technology]

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

[0003] Successor systems to LTE (for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being 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 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In future wireless communication systems (e.g., NR), reporting of channel status information (CSI) based on the reception of a reference signal is being considered. Furthermore, the use of DL transmission from one or more transmission / reception points (TRPs) (single TRP (STRP) / multi-TRP (MTRP)) to a user terminal (User Equipment (UE)) is being explored. Coherent joint transmission (CJT) using multiple TRPs is also being considered.

[0006] However, progress has not been made in considering the setting / reporting of CSI to CJT. If such methods are not clearly defined, there is a risk of deterioration in communication throughput and communication quality.

[0007] Therefore, this disclosure provides a terminal and wireless communication method for appropriately submitting CSI reports to CJT. 、 base station and system One of the objectives is to provide [this]. [Means for solving the problem]

[0008] A terminal according to one aspect of this disclosure includes a control unit that controls the transmission of capability information indicating support for a codebook for coherent joint transmission (CJT), and a receiving unit that receives a channel status information (CSI) reporting setting that indicates a codebook for CJT as the codebook type and sets X channel measurement resources (CMRs). The capability information indicates the maximum value of X. . [Effects of the Invention]

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

[0010] [Figure 1] Figure 1 shows an example of a 16-level quantization table. [Figure 2] Figure 2 shows an example of an 8-level quantization table. [Figure 3] Figure 3 shows an example of transmission using K CSI-RS ports. [Figure 4] Figures 4A and 4B show examples of NCJT and CJT. [Figure 5] Figure 5 shows an example of option 1-1. [Figure 6] Figure 6 shows another example of option 1-1. [Figure 7] Figure 7 shows an example of option 1-2. [Figure 8] Figures 8A and 8B show an example of option 2-A. [Figure 9] Figure 9 shows an example of CJT CSI for option 3-A. [Figure 10] Figure 10 shows an example of a codebook for option 3-A. [Figure 11] Figure 11 shows an example of CJT CSI for option 3-B. [Figure 12] Figure 12 shows an example of a codebook for option 3-B. [Figure 13] Figure 13 shows an example of CJT CSI for Option 3-C. [Figure 14] Figure 14 shows an example of CJT CSI for option 3-D. [Figure 15] Figure 15 shows an example of a new table for the TRP amplitude codebook. [Figure 16] Figure 16 shows an example of a new table for the TRP phase codebook. [Figure 17] Figure 17 shows an example of a new table for the TRP inter-coefficient codebook. [Figure 18] Figures 18A and 18B show an example of the mapping sequence of CSI parts 1 and 2 according to the fifth embodiment. [Figure 19] Figure 19 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 20] Figure 20 shows an example of the configuration of a base station according to one embodiment. [Figure 21] Figure 21 shows an example of the configuration of a user terminal according to one embodiment. [Figure 22] Figure 22 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. [Figure 23] Figure 23 shows an example of a vehicle according to one embodiment. [Modes for carrying out the invention]

[0011] (CSI report (CSI report or reporting)) In Rel.15 NR, a terminal (also called a user terminal, User Equipment (UE), etc.) generates (determines, calculates, estimates, measures, etc.) channel state information (CSI) based on a reference signal (RS) (or a resource for the RS), and transmits (reports, provides feedback, etc.) the generated CSI to the 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 at least one of the following: a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), or a Demodulation Reference Signal (DMRS).

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

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

[0015] The UE may receive information regarding CSI reporting (report configuration information) and control CSI reporting based on said report configuration information. Such report configuration information may be, for example, the "CSI-ReportConfig" information element (IE) of Radio Resource Control (RRC). In this disclosure, RRC IE may be interpreted interchangeably with RRC parameters, higher layer parameters, etc.

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

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

[0018] Furthermore, the reported quantity information may specify at least one combination of the above CSI parameters (e.g., CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0019] Furthermore, resource information may also be the ID of a resource for RS. Such RS resources may include, for example, a non-zero-power CSI-RS resource or SSB and a CSI-IM resource (for example, a zero-power CSI-RS resource).

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

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

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

[0023] If wideband PMI reporting is established (decided), one wideband PMI may be reported for the entire CSI reporting band. On the other hand, if subband PMI reporting is established, a single wideband indication i1 may be reported for the entire CSI reporting band, and one or more subband indications i2 (e.g., subband indications for each subband) may be reported for each subband within the entire CSI reporting band.

[0024] The UE performs channel estimation using the received RS and estimates the channel matrix H. The UE then feeds back the index (PMI) determined based on the estimated channel matrix.

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

[0026] In a spatial 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. Single-beam can be rephrased as a single layer, and multi-beam can be rephrased as multiple beams. Furthermore, Type 1 CSI may not assume multi-user multiple input multiple output (MIMO), while Type 2 CSI may assume multi-user MIMO.

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

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

[0029] The Uphill Control Information (UCI) type may include at least one of the following: Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), scheduling request (SR), or CSI. The UCI may be carried by PUCCH or by PUSCH.

[0030] In Rel.15 NR, the UCI may include one CSI part for wideband PMI feedback. CSI report #n will include PMI wideband information if reported.

[0031] In Rel.15 NR, the UCI may include two CSI parts for subband PMI feedback. CSI part 1 contains wideband PMI information. CSI part 2 contains one wideband PMI piece and several subband PMI pieces. CSI parts 1 and 2 are encoded separately.

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

[0033] To enable more dynamic channel / interference hypotheses for NCJT, targeting both FR1 and FR2, evaluation and specification of CSI reporting for at least one multi-TRP and multi-panel transmission of DL are being considered.

[0034] (Multi-TRP) In NR, it is being considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) will use one or more panels (multi-panels) to perform DL transmission to the UE. Furthermore, it is being considered that the UE will use one or more panels to perform UL transmission to one or more TRPs.

[0035] Multiple TRPs may correspond to the same cell identifier (Cell Identifier (ID)) or to different cell IDs. This cell ID may be a physical cell ID or a virtual cell ID.

[0036] Multiple TRPs (TRP#1, #2) may be connected by an ideal / non-ideal backhaul, and information, data, etc., may be exchanged. Each TRP in a multi-TRP may transmit a different code word (CW) and a different layer. Non-coherent joint transmission (NCJT) may be used as one form of multi-TRP transmission.

[0037] In NCJT, for example, TRP1 modulates and layers a first codeword and transmits a first PDSCH using a first precode with a first number of layers (e.g., 2 layers). TRP2 modulates and layers a second codeword and transmits a second PDSCH using a second precode with a second number of layers (e.g., 2 layers).

[0038] Furthermore, multiple PDSCHs (Multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. In other words, 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] These first and second PDSCHs may be assumed not to be quasi-co-located. Reception of multiple PDSCHs may be reinterpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0040] Multiple PDSCHs from a multi-TRP (which may also be called multiple PDSCHs) may be scheduled using a single DCI (single DCI (S-DCI), single PDCCH) (single master mode). A single DCI may be transmitted from one TRP of the multi-TRP. Multiple PDSCHs from a multi-TRP may each be scheduled using multiple DCIs (multi-DCI (M-DCI), multi-PDCCH (multiple PDCCH)) (multi-master mode). Multiple DCIs may each be transmitted from the multi-TRP. The UE may be assumed to send separate CSI reports for different TRPs, each for each TRP. Such CSI feedback may be called separate feedback, separate CSI feedback, etc. In this disclosure, “separate” may be interpreted as “independent.”

[0041] Furthermore, CSI feedback may be used, where CSI reports for both TRPs are sent to a single TRP. Such CSI feedback may also be called joint feedback or joint CSI feedback.

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

[0043] Such multi-TRP scenarios allow for more flexible transmission control using high-quality channels.

[0044] (Codebook settings) The UE (Unified Environment) configures its codebook parameters (CodebookConfig) via higher-layer signaling (RRC signaling). The codebook configuration is included in the higher-layer (RRC) parameter CSI-ReportConfig.

[0045] In the codebook configuration, 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 parameters related to codebook subset restriction (CBSR) (…Restriction). The CBSR setting is a bit that indicates which PMI reports are allowed ("1") and which are not allowed ("0") for the precoder associated with the CBSR bit. Each bit in the CBSR bitmap corresponds to one codebook index / antenna port.

[0047] (CSI reporting settings) The CSI reporting configuration (CSI-ReportConfig) in Rel.16 includes, in addition to the codebook configuration (CodebookConfig), CSI-RS resources for channel measurement (resourcesForChannelMeasurement (CMR)), CSI-RS resources for interference measurement (csi-IM-ResourcesForInterference (ZP-IMR), nzp-CSI-RS-ResourcesForInterference (NZP-IMR)), etc. Of the parameters of CSI-ReportConfig, all parameters except codebookConfig-r16 are also included in the CSI reporting configuration in Rel.15.

[0048] In Rel.17, an extended CSI reporting configuration (CSI-ReportConfig) for CSI measurement / reporting of multi-TRPs using NCJT is being considered. In this CSI reporting configuration, two CMR groups are set up, corresponding to each of the two TRPs. The CMRs within each CMR group may be used for at least one measurement of multi-TRPs and single TRPs using NCJT. The N CMR pairs of NCJT are set up by RRC signaling. The UE may be configured by RRC signaling to determine whether to use the CMRs of the CMR pairs for single TRP measurements.

[0049] For CSI reporting related to multi-TRP / panel NCJT measurements configured by a single CSI reporting setting, support for at least one of the following options 1 and 2 is being considered.

[0050] <Option 1> The UE is set to report X CSIs (X=0, 1, 2) associated with a single TRP measurement hypothesis / assumption 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 that corresponds to the best measurement result among the measurement hypotheses for NCJT and single TRP.

[0052] As mentioned above, in Rel.15 / 16, CBSR is set for each codebook setting for each CSI reporting configuration. In other words, CBSR applies to all CMRs, etc., within the corresponding CSI reporting configuration.

[0053] However, when applying options 1 and 2 above to the CSI reporting settings for Rel.17 multi-TRP, the following measurement settings may be made. Option 1 (X=0): Measurement of NCJT CSI only. Option 1 (X = 1): Measurement of the CSI of NCJT and the CSI of a single TRP (one TRP). Option 1 (X = 2): Measurement of the CSI of NCJT and the CSI of a single TRP (two TRPs). Option 2: Measurement of both the CSI of 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 being considered. For CJT multi-TRP for FDD, an improvement of the Rel. 16 / 17 type 2 codebook is being considered.

[0055] For the type 2 CSI of Rel. 16, for a given layer k, information based on the following equation may be reported by the UE. W = W1W ~ k W f,k H (1)

[0056] 》Here, W is a matrix, and W ~ indicates ~(tilde w) above W. N t is the number of ports. N3 is the number of sub-bands. L is the number of beams.

[0057] W1(N t × 2L) is a matrix consisting of spatial domain (SD) bases. Multiple indices of 2D-DFT vectors and a 2D over-sampling factor are reported.

[0058] W ~ k (2L × M v(W) is a matrix consisting of combination coefficients (sub-band complex linear combination (LC) coefficients). A maximum of K0 non-zero coefficients (NZCs) are reported. The report consists of two parts: a bitmap capturing the NZC positions and the quantized NZCs.

[0059] W f,k (N3×M v ) is a matrix consisting of frequency domain (FD) bases. There are M DFT bases for each layer. When N3 > 19, M DFTs from an intermediate subset (InS) of size N3' (< N3) are selected. When N3 ≤ 19, log2(C(N3 - 1, M v - 1)) bits are reported. Here, C(N3 - 1, M v - 1) is the number of combinations of choosing M v - 1 from N3 - 1, and is also called binomial coefficients.

[0060] <00003​​​​​​​​​​​​​​​​​​​​​​​​​​​​​The Rel.16 PUSCH-based Type 2 CSI feedback consists of two parts. Part 1 has a fixed payload size and is used to identify the number of information bits in Part 2. In the enhanced Type 2 CSI feedback, Part 1 includes the RI, the CQI, and an indication of the total number of non-zero amplitudes across multiple layers for the enhanced Type 2 CSI. The fields of Part 1 are encoded separately. Part 2 includes the PMI of the enhanced Type 2 CSI. Parts 1 and 2 are encoded separately. The CSI Part 2 (PMI) includes the oversampling factor, multiple indices of the 2D-DFT basis, and the index M of the initial DFT basis for the selected DFT window. initial This includes at least one of the following: a DFT basis selected for each layer, non-zero LC coefficients (amplitude and phase) for each layer, the strongest coefficient indicator for each layer, and the amplitude of the strongest coefficient for each layer / polarization.

[0062] Multiple PMI indices associated with different CSI Part 2 information may, for the k-th layer, follow the following: ·i 1,1 : Oversampling factor ·i 1,2 : Multiple indexes based on 2D-DFT ·i 1,5 : Index M of the initial DFT basis for the selected DFT window initial ·i 1,6,k : DFT basis selected for the k-th layer ·i 1,7,k : Bitmap for the k-th layer ·i 1,8,k : A coefficient indicator for the strongest (maximum intensity) layer of the kth layer. ·i 2,3,k : Amplitude of the strongest coefficient (for both polarizations) of the k-th layer ·i 2,4,k : Amplitude of the reported coefficient of the k-th layer ·i 2,5,k : Phase of the reported coefficients of the k-th layer

[0063] i 1,5 and i 1,6,k This is the PMI index for DFT reporting. Only when N3 > 19, i 1,5 It is reported.

[0064] As part of the CSI Part 2 grouping, PMI information for a given CSI report is grouped into three groups (groups 0 and 2). This is important when CSI omissions occur. Index i 2,4,l i 2,5,l i 1,7,l Each reported element is associated with a specific priority rule. Groups 0 and 2 follow the following: 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 highest (top) v2LM among them v -floor(K NZ / 2) priority elements, i 2,3,l i 2,4,l The highest (top) ceil (K NZ / 2)-v priority elements, i 2,5,l The highest (top) 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 (l=1,...,v) priority elements (l=1,...,v)

[0065] In Rel.16 Type 2 port selection (PS) CSI, the Type 2 PS codebook (CB) does not require the UE to derive the SD beam by considering the 2D-DFT basis within a normal Type 2 CB. Instead, the base station transmits CSI-RS using K beamformed CSI-RS ports that consider a set of spatial domain (SD) beams (Figure 3). The UE identifies the best L (≤K) CSI-RS ports and reports their index within W1.

[0066] For a layer l ∈ {1, 2, 3, 4}, precoder generation for each subband (subband(SB)-wise) is given by the following equation: W l (N t ×N3) = QW1W ~ l W f,l H (2)

[0067] Here, Q(N t ×K) represents the K SD beams used in CSI-RS beamforming. W1(K×2L) is a diagonal matrix. ~ k (2L×M) is the LC coefficient matrix. f,l (N3×M) is the DFT basis vector (FD basis). 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 If >4, then L∈{2,3,4}.

[0068] In Rel.17 Type 2PS CSI, each CSI-RS port is beamformed using the SD beam and FD basis vector. Each port is associated with an SD-FD pair.

[0069] For a given layer k, the UE may report information based on the following equation. W k(K × N3) = W1W ~ k W f,k H (3)

[0070] For W1(K × 2L), each matrix block consists of L columns of the K × K identity matrix. The base station transmits K beamformed CSI-RS ports. Each port is associated with an SD-FD pair. The UE selects L ports out of K and reports them to the base station as part of PMI(W 1,l ).

[0071] W ~ k (2L × M v ) is a matrix consisting of combination coefficients (sub-band complex LC coefficients). Up to 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.

[0072] W f,k (N3 × M v ) is a matrix consisting of multiple FD bases. There are M v DFT bases per layer. The base station may cancel W f,k . If W f,k is on, M v additional FD bases are reported. If W f,k is off, no additional FD bases are reported.

[0073] For Rel.17's NCJT CSI, two CMR groups with K s (= K1 + K2) CMRs are set for the UE. K1 and K2 are the number of CMRs in the two CMR groups respectively. By being selected from all possible pairs, N CMR pairs are set by the upper layer. N = 1 and K s = 2 are supported. N max = 2 is an optional feature of the UE. K s,max=2 is an optional feature of UE.

[0074] 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 premise (hypotheses) and one CSI associated with an NCJT measurement premise. X may be 0, 1, or 2. If X=2, the two CSIs are associated with different single TRP measurement premises using multiple CMRs from different CMR groups. Supporting X=1 or 2 is an optional feature for this option 1. [Option 2] The UE may be configured to report one CSI associated with the best of the two NCJT measurement premises and the single TRP measurement premises.

[0075] (JT) Joint transmission (JT) may mean simultaneous data transmission from multiple points (e.g., TRPs) to a single UE.

[0076] Rel.17 supports NCJT from two TRPs. PDSCHs from the two TRPs may be precoded and decoded independently. Frequency resources may be non-overlapping, partially overlapping, or fully overlapping. If overlap occurs, a PDSCH from one TRP will interfere with a PDSCH from the other TRP.

[0077] Figure 4A shows an example of NCJT from two TRPs. Signal x1 from the first TRP is precoded by the precoding matrix V1 and transmitted, affected by the channel matrix H1, and received as signal y1. Signal x2 from the second TRP is precoded by the precoding matrix V2 and transmitted, affected by channel H2, and received as signal y2. Layer i may also come from a single TRP. Here, H1 = U1ΣV1 H H2 = U2ΣV2 H Alternatively, y1 = H1V1x1 and y2 = H2V2x2 may also be used.

[0078] Rel.18 considers supporting CJT using up to four TRPs. Data from the four TRPs may be coherently precoded and transmitted to the UE over the same time-frequency resources. For example, the same precoding matrix may be used to consider channels from four TRPs. Coherence may mean that there is a constant relationship between the phases of multiple received signals. Using 4TRP joint precoding may improve signal quality and eliminate interference between the four TRPs. The data may only be subject to interference outside the four TRPs.

[0079] Figure 4B shows an example of a CJT from four TRPs. Signals from the first to fourth TRPs are precoded by the precoding matrix V and transmitted. The signals x from the first to fourth TRPs are affected by the channel matrices H1, H2, H3, and H4 respectively and received as signals y. Layer i may also come from all four TRPs. Here, H = H1 + H2 + H3 + H4 = UΣV H Alternatively, y = HVx may also be used.

[0080] In the ideal case (where the four TRPs are collated (considered to be in the same position)), joint estimation of the aggregated channel matrix H can be performed, and the joint precoding matrix V can be fed back. However, the large-scale path losses of the four paths can differ significantly. The joint precoding matrix V based on a constant module codebook is not accurate. In this case, the feedback for each TRP and the coefficients between TRPs (inter-TRP) can be aligned with the current NR type 2 codebook.

[0081] For CJT of up to four TRPs in FR1, the selection of the four TRPs may be semi-static. Therefore, the selection and the setting of the four CMRs (four CSI-RS resources) for channel measurement may also be semi-static. Dynamic instruction of the four TRPs from the list of CSI-RS resources is also possible, but unlikely.

[0082] The path loss from the four TRPs to the UE is different. Therefore, it is insufficient to report only one aggregated CSI representing the joint channel matrix.

[0083] Considering the fallback behavior to NCJT (i.e., single TRP), per-TRP CSI (i.e., single TRP CSI like Rel.17noNCJT CSI) is also important.

[0084] To support dynamic operation between 2-TRP CJT, 3-TRP CJT, and 4-TRP CJT, the question arises as to how to report CJT CSIs and how to consider the possibility of x-TRP CJTs. The reported CJT CSIs may enable base station CSI updates for x-TRP CJTs.

[0085] The following problems are possible. [Problem 1] CMR settings for 4-TRP [Problem 2] IMR settings [Problem 3] New codebooks and reporting requirements for CJT CSI for up to four TRPs [Problem 4] CSI priority and CSI omission for new report contents

[0086] The issues surrounding these problems have not been adequately addressed. If these issues are not sufficiently addressed, there is a risk of degradation in throughput, communication quality, and other aspects.

[0087] Therefore, the inventors conceived a method for setting / reporting CSI to CJT.

[0088] The embodiments relating to this disclosure will be described in detail below with reference to the drawings. Each of the following embodiments (for example, each case) may be used individually or at least two may be applied in combination.

[0089] In this disclosure, "A / B" and "at least one of A and B" may be interpreted as mutually exclusive. In this disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0090] In this disclosure, terms such as activate, deactivate, indicate, select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and operable may be interpreted interchangeably.

[0091] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, information elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0092] In this disclosure, the upper-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0093] In this disclosure, MAC signaling may include, for example, MAC Control Elements (MAC CEs) and MAC Protocol Data Units (PDUs). Broadcast information may include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), and Other System Information (OSIs).

[0094] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0095] In this disclosure, terms such as index, identifier (ID), indicator, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, and subset may be interpreted interchangeably.

[0096] In this disclosure, the terms used include: panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmit entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relationship, 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 relationship group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) groups, PUCCH resource groups, resources (e.g., reference signal resources, SRS resources), resource sets (e.g., reference signal resource sets), CORESET pools, 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 assumptions, etc., may be interpreted interchangeably.

[0097] In this disclosure, time domain resource allocation and time domain resource assignment may be interpreted as mutually exclusive.

[0098] (Wireless communication method) In each embodiment, at least one of the above-mentioned Rel.16 type 2 CSI report, Rel.16 type 2 port selection CSI report, and Rel.17 type 2 port selection CSI report may be considered as a single TRP CSI.

[0099] In each embodiment, the X TRPs and x-TRPs may be interchangeable. In each embodiment, the CJT using the X TRPs and the x-TRP CJT may be interchangeable.

[0100] 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.

[0101] In each embodiment, "inter-TRP," "inter-TRP difference," and "inter-TRP comparison" may be interpreted interchangeably.

[0102] In each embodiment, the inter-TRP phase index and the inter-TRP phasing index may be interchangeable. In each embodiment, the inter-TRP index and the inter-TRP coefficient index may be interchangeable.

[0103] In each embodiment, the inter-TRP phase matrix and the inter-TRP phasing matrix may be interchangeable. In each embodiment, the inter-TRP matrix and the inter-TRP coefficient matrix may be interchangeable.

[0104] In each embodiment, the inter-TRP phase codebook and the inter-TRP phasing codebook may be interchangeable. In each embodiment, the inter-TRP codebook and the inter-TRP coefficient codebook may be interchangeable.

[0105] 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.

[0106] In each embodiment, the TRP inter-codebook and the multi-panel codebook for type 2 codebooks may be interchangeable.

[0107] In each embodiment, the operation of inter-TRP codebook reporting may be similar to the operation of inter-panel codebook reporting.

[0108] <First Embodiment> This embodiment relates to CMR.

[0109] If a new parameter indicating the codebook type is set (for example, codebookType=TypeII-CJT-r18 or TypeII-PortSelection-CJT-r18), new CJT CSI feedback based on existing Type 2 / Type 2 port selection may be set. New UE capabilities may be defined for each new codebook type for CJT.

[0110] The CMR settings / instructions may follow any of the following options 1-1 to 1-3.

[0111] 《Option 1-1》 The TRP number (CJT CSI number) may be explicitly set as X, or it may be implicitly indicated through the number of target resources (CMR (CSI-RS resource) / CMR group / CSI-RS resource set) in the CSI reporting configuration (CSI-ReportConfig). New UE capabilities for X may be defined. For example, X is an integer and may be up to 4, or 2, 3, 4, or greater than 4.

[0112] Within the CSI-ReportConfig for CJT CSI feedback, up to X target resources (CMR (CSI-RS resource) / CMR group / CSI-RS resource set) may be configured for the first resource setting for channel measurement. Each of these target resources (CMR (CSI-RS resource) / CMR group / CSI-RS resource set) may correspond to one TRP.

[0113] It is preferable to use X CSI-RS resources. For X CMR groups / CSI-RS resource sets, an additional bitmap is required to indicate the combination of CMRs from those X CMR groups / CSI-RS resource sets.

[0114] One CMR from X CMRs may be measured and reported by the UE as a reference CSI. For example, the first CRI / CSI in the mapping order may be considered the reference CSI. Other CMRs may be measured considering the inter-TRP difference based on the reference CSI.

[0115] In the example in Figure 5, X=4. Four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured for each of the four TRPs.

[0116] [Variations] Up to N*X CMRs may be set to consider the selection of different x-TRPs (X TRPs). Here, each of the X CMRs may correspond to X TRPs for CJT CSI. The N combinations of x-TRPs may be measured and selected by the UE for CJT CSI. A new UE capability for N may be defined. For example, N may be 1 or 2.

[0117] In the example in Figure 6, 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 set up.

[0118] 《Options 1-2》 Up to X CSI reporting settings (CSI-ReportConfigs) may be set and associated with a CJT CSI. Here, each CSI-ReportConfig may correspond to one TRP. Up to N CMRs may be set for each CSI-ReportConfig. For example, N may be 1 or 2 or more.

[0119] The CMR settings / instructions may follow either option 1-2-1 or 1-2-2 below.

[0120] [Option 1-2-1] One of the X CSI-ReportConfigs may be set as the reference CSI-ReportConfig, and the other X-1 CSI-ReportConfigs may be associated with the reference CSI-ReportConfig.

[0121] In the example in Figure 7, four CSI-ReportConfigs (#1, #2, #3, #4) are configured for each of the four TRPs. CSI-ReportConfig#1 is set as the reference CSI-ReportConfig, and CSI-ReportConfig#2, #3, and #4 are associated with CSI-ReportConfig#1.

[0122] [Option 1-2-2] One CMR may be selected from one CSI-ReportConfig out of X CSI-ReportConfigs, and the CSI based on it may be reported as the reference CSI. Other CMRs from other CSI-ReportConfigs may be measured considering the difference between TRPs based on the reference CSI. Within each CSI-ReportConfig, only one CMR may be set for the CJT CSI, and a 1-bit indicator of the reference CSI may be reported for each CSI-ReportConfig. The 1-bit indicator may indicate whether the corresponding CSI is the reference CSI.

[0123] In option 1-1 described above, one CSI-ReportConfig may be associated with multiple TRPs. One CSI-RS (CSI-RS resource / CMR) may be associated with one TRP. In option 1-2 described above, one CSI-ReportConfig may be associated with one TRP.

[0124] Options 1-3 Within the CSI-ReportConfig for CJT CSI feedback, one or more N-port CSI-RS resources may be configured for CJT CSI measurement. Here, one or more ports from the N ports may correspond to one TRP. Some of the N ports may correspond to one TRP, while the other ports may correspond to other TRPs. N ≥ X may also apply.

[0125] For example, if one N-port CSI-RS resource is configured, the UE may measure all N ports and report one CSI. Alternatively, the UE may measure all N ports, assuming that each port is transmitted by multiple TRPs. In this case, CSI extension is not necessary (TRPs are not visible to the UE (transparent)), but a new QCL type may be required for that CSI-RS resource because it is transmitted by multiple TRPs instead of one.

[0126] According to this embodiment, the UE can appropriately configure the CMR for CJT CSI feedback.

[0127] <Second Embodiment> This embodiment relates to IMR.

[0128] It may be assumed that there is no interference between TRPs for CJT. Alternatively, interference from sources other than X TRPs (interference from sources other than X TRPs) may exist.

[0129] Within the CSI-ReportConfig for CJT CSI feedback, the same IMR (ZP CSI-RS resource) may be set for CMRs from X TRPs. Based on that IMR, interferences other than those from X TRPs may be measured.

[0130] IMR settings / instructions may follow either option 2-A or 2-B below.

[0131] [Option 2-A] For X CMRs, only one IMR may be configured within the second resource setting. The UE may assume that this applies to all CMRs.

[0132] In the example in Figure 8A, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured within the CSI-ReportConfig according to option 1-1 described above. Furthermore, within that CSI-ReportConfig, one IMR (ZP CSI-RS resource #2) is configured in a second resource setting for one of the CMRs. The UE applies this one IMR to the four CMRs.

[0133] [Option 2-B] A one-to-one CMR-IMR mapping configuration framework is maintained, but the same IMR resource may be configured for each CMR within a second resource setting. The UE may assume that the same IMR resource is configured for each CMR within the second resource setting, or it may correspond to the CMRs in the first resource setting.

[0134] In the example shown in Figure 8B, four CMRs (CSI-RS Resources #1, #4, #5, and #8) are configured within the CSI-ReportConfig according to option 1-1 described above. Furthermore, within that CSI-ReportConfig, the same IMR (ZP CSI-RS Resource #2) is configured in the second resource setting for each CMR. The UE applies the corresponding IMR to each CMR.

[0135] According to this embodiment, the UE can appropriately configure the IMR for CJT CSI feedback.

[0136] <Third Embodiment> This embodiment relates to the Codebook / CSI.

[0137] In the aforementioned Option 1-1, if X CMRs for TRPs are configured within one CSI-ReportConfig, the CSIs within one CSI report may follow any of the following Options 3-A through 3-D.

[0138] 《Option 3-A》 A CSI report may include at least one of the following CJT CSIs. The number of CJT CSIs may be less than four or more than five. The first CJT CSI may include existing single TRP CSIs and CRIs for the first TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set. The second CJT CSI includes 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 the following: an inter-TRP phasing index from the inter-TRP phasing matrix, an inter-TRP amplitude index from the inter-TRP amplitude matrix, and a single inter-TRP coefficient index from the inter-TRP coefficient matrix. This index may be an index based on a comparison with the first CJT CSI. The third CJT CSI includes 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 the following: an inter-TRP phasing index from the inter-TRP phasing matrix, an inter-TRP amplitude index from the inter-TRP amplitude matrix, and a single inter-TRP coefficient index from the inter-TRP coefficient matrix. This index may be an index based on a comparison with the first CJT CSI. The fourth CJT CSI includes existing single TRP CSIs and CRIs for the fourth TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one index of the following: an inter-TRP phasing index from the inter-TRP phasing matrix, an inter-TRP amplitude index from the inter-TRP amplitude matrix, and a single inter-TRP coefficient index from the inter-TRP coefficient matrix. This index may be an index based on a comparison with the first CJT CSI.

[0139] The i-th (i≧2) CJT CSI may include an index based on a comparison between the 1st CJT CSI and the i-th CJT CSI.

[0140] The CRI index of the first CJT CSI may be selected by the UE from X CMRs and reported using a bit size of log2(X). This CRI index may also be a reference CSI with the best channel conditions.

[0141] Using this CSI, base stations can update 2-TRP, 3-TRP, and 4-TRP CJT CSIs with reference TRPs for dynamic scheduling.

[0142] In the example of FIG. 9, in accordance with the aforementioned Option 1-1, within CSI-ReportConfig, four CMRs (CSI-RS resources #1, #4, #5, #8) are set. 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 based on CSI-RS resource #4 and a single TRP CSI, and an index of amplitude / phase between TRPs based on the reference CSI (the single TRP CSI of CSI-RS resource #1). The third CJT CSI includes a CRI based on CSI-RS resource #5 and a single TRP CSI, and an index of amplitude / phase between TRPs based on the reference CSI (the single TRP CSI of CSI-RS resource #1). The fourth CJT CSI includes a CRI based on CSI-RS resource #8 and a single TRP CSI, and an index of amplitude / phase between TRPs based on the reference CSI (the single TRP CSI of CSI-RS resource #1).

[0143] FIG. 10 shows an example of a new 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). The PMI index i 3,1 indicates, as new CSI information for CJT CSI, the inter-TRP phase index (compared with the reference CSI / TRP). The PMI index i 3,2 indicates, as new CSI information for CJT CSI, the inter-TRP amplitude index (compared with the reference CSI / TRP). The PMI index i3 indicates, as new CSI information for CJT CSI, the inter-TRP coefficient index (compared with the reference CSI / TRP).

[0144] 《Option 3-B》 The CSI report may include at least one of the following CJT CSIs. The number of CJT CSIs may be less than 4 or more than 5. The first CJT CSI may include existing single TRP CSIs and CRIs for the first TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set. The second CJT CSI includes 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 the following: an inter-TRP phasing index from the inter-TRP phasing matrix, an inter-TRP amplitude index from the inter-TRP amplitude matrix, and a single inter-TRP coefficient index from the inter-TRP coefficient matrix. This index may be an index based on a comparison with the first CJT CSI. The third CJT CSI includes 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 the following: an inter-TRP phasing index from the inter-TRP phasing matrix, an inter-TRP amplitude index from the inter-TRP amplitude matrix, and a single inter-TRP coefficient index from the inter-TRP coefficient matrix. This index 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 includes existing single TRP CSIs and CRIs for the fourth TRP / CMR / CSI-RS resource / CMR group / CSI-RS resource set, and may include at least one index of the following: an inter-TRP phasing index from the inter-TRP phasing matrix, an inter-TRP amplitude index from the inter-TRP amplitude matrix, and a single inter-TRP coefficient index from the inter-TRP coefficient matrix. This index may be at least one of the following: an index based on comparison with the first CJT CSI, an index based on comparison with the second CJT CSI, and an index based on comparison with the third CJT CSI.

[0145] The i-th (i≧2)th CJT CSI may include an index based on a comparison of the first to i-1th CJT CSIs.

[0146] The CRI index of the first CJT CSI may be selected by the UE from X CMRs and reported using a bit size of log2(X). This CRI index may be a reference CSI with the best channel conditions. 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.

[0147] Compared to option 3-A, option 3-B allows the base station to update any CJT CSI of 2-TRP, 3-TRP, or 4-TRP with a reference TRP for dynamic scheduling.

[0148] In the example in Figure 11, four CMRs (CSI-RS resources #1, #4, #5, #8) are configured within CSI-ReportConfig according to option 1-1 described above. The CSI report includes the first to fourth CJT CSIs. The first CJT CSI includes the CRI based on CSI-RS resource #1 and a single TRP CSI as the reference CSI. The second CJT CSI includes the CRI based on CSI-RS resource #4 and a single TRP CSI, and an amplitude / phase index between TRPs based on the reference CSI (single TRP CSI of CSI-RS resource #1). The third CJT CSI includes the CRI based on CSI-RS resource #5 and a single TRP CSI, an amplitude / phase index between TRPs based on the reference CSI (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 the CRI and single TRP CSI based on CSI-RS resource #8, the amplitude / phase index between TRPs based on the reference CSI (single TRP CSI of CSI-RS resource #1), the amplitude / phase index between TRPs based on the single TRP CSI of CSI-RS resource #4, and the amplitude / phase index between TRPs based on the single TRP CSI of CSI-RS resource #5.

[0149] Figure 12 shows an example of a novel codebook for at least one of the following: the inter-TRP phase index, the inter-TRP amplitude index, and the inter-TRP coefficient index (including both amplitude and phase). PMI Index i 3,1 This shows the inter-TRP phase index (compared to the reference CSI / TRP) as new CSI information for CJT CSI. PMI index i 3,2 This shows the inter-TRP amplitude index (compared to the reference CSI / TRP) as new CSI information for CJT CSI. PMI index i 3,3This presents the inter-TRP phase index (compared to the second reported CSI / TRP) as new CSI information for CJT CSI. PMI index i 3,4 This presents the inter-TRP amplitude index (compared to the second reported CSI / TRP) as new CSI information for CJT CSI. PMI index i 3,5 This presents the TRP interphase index (compared to the third reported CSI / TRP) as new CSI information for CJT CSI. PMI index i 3,6 This presents the inter-TRP amplitude index (compared to the third reported CSI / TRP) as new CSI information for CJT CSI.

[0150] 《Option 3-C》 Based on the aforementioned options 3-A / 3-B, at least one of the following additional items may be reported for the second / third / fourth CJT items. The number of CJT CSIs may be less than 4 or more than 5. The second CJT CSI may further include a CQI (2-TRP CQI) that assumes a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the second CJT CSI (CMR for the first CJT CSI and CMR for the second CJT CSI). The third CJT CSI may further include at least one of the following: 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 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) (3-TRP CQI). The fourth CJT CSI may further include at least one of the following: 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 assuming a 4-TRP CJT of the CRI in the first CJT CSI, the CRI in the second CJT CSI, the CRI in the third CJT CSI, and the 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).

[0151] The i-th (i≧2) CJT CSI may include CQIs that assume the i-TRP CJTs from the 1st to the ith.

[0152] New CQI (x-TRP CQI) reporting may be required for at least one of the following: a 2-TRP CJT (where one TRP is a reference TRP / CSI), a 3-TRP CJT (where one TRP is a reference TRP / CSI), and a 4-TRP CJT (where one TRP is a reference TRP / CSI).

[0153] Whether or not a new x-TRP CQI is reported within an x-TRP CJT CSI may be configured within the RRC IE (CSI-ReportConfig).

[0154] [Variations] No additional new x-TRP CQIs may be reported; instead, existing single TRP CQIs may be reported within each CJT CSI. An x-TRP CJT may contain CMR / TRPs reported in the first i CJT CSIs. For example, a 4-TRP CJT may contain CMR / TRPs reported in the first i CJT CSIs.

[0155] In the example in Figure 13, four CMRs (CSI-RS resources #1, #4, #5, and #8) are configured within CSI-ReportConfig according to option 1-1 described 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 a reference CSI. The second CJT CSI includes a CRI based on CSI-RS resource #4 and a single TRP CSI, where 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, where 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 a single TRP CSI based on CSI-RS resource #8, where the single TRP CQI may be replaced by a 4-TRP CQI (based on CSI-RS resources #1, #4, #5, and #8).

[0156] 《Option 3-D》 Based on the aforementioned options 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-1 CJT CSIs, as may be based on the i-1 CJT CSIs. The second CJT CSI may further include a CQI (2-TRP CQI) that assumes a 2-TRP CJT of the CRI in the first CJT CSI and the CRI in the second CJT CSI (CMR for the first CJT CSI and CMR for the second CJT CSI). The third CJT CSI may further include at least one of the following: 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 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) (3-TRP CQI). The 4th CJT CSI further includes a CQI assuming a 2-TRP CJT of the CRI in the 1st CJT CSI and the CRI in the 4th CJT CSI (CMR for the 1st CJT CSI, CMR for the 4th CJT CSI, and CMR for the 2nd CJT CSI), a CQI assuming a 2-TRP CJT of the CRI in the 2nd CJT CSI and the CRI in the 4th CJT CSI (CMR for the 2nd CJT CSI, CMR for the 4th CJT CSI, and CMR for the 2nd CJT CSI), a CQI assuming a 2-TRP CJT of the CRI in the 3rd CJT CSI and the CRI in the 4th CJT CSI (CMR for the 3rd CJT CSI, CMR for the 4th CJT CSI, and CMR for the 2nd CJT CSI), and the CRI in the 1st CJT CSI and the 2nd CJT CQI assuming a 3-TRP CJT of CRI within CSI and CRI within the 4th CJT CSI (CMR for the 1st CJT CSI, CMR for the 2nd CJT CSI, and CMR for the 4th CJT CSI), CQI assuming a 3-TRP CJT of CRI within the 1st CJT CSI, CRI within the 3rd CJT CSI, and CRI within the 4th CJT CSI (CMR for the 1st CJT CSI, CMR for the 3rd CJT CSI, and CMR for the 4th CJT CSI), CQI assuming a 3-TRP CJT of CRI within CSI, CRI within CSI, CRI within CSI, and CRI within CSI (CMR for the 2nd CJT CSI, CMR for the 3rd CJT CSI, and CMR for the 4th CJT CSI), and CQI assuming a 3-TRP CJT of CRI within CSI and CRI within CSI It may include at least one of the following: a CQI (4-TRP CQI) that assumes a 4-TRP CJT, consisting of a CRI in the CSI and a CRI in the 3rd CJT CSI and a CRI in the 4th CJT CSI (CMR for the 1st CJT CSI, CMR for the 2nd CJT CSI, CMR for the 3rd CJT CSI, and CMR for the 4th CJT CSI).

[0157] The i-th (i≧2) CJT CSI may include a CQI that assumes a j(2≦j≦i)-TRP CJT using at least two of the first to i-th CJTs.

[0158] New CQI (x-TRP CQI) reporting for at least one of the following may be stipulated: 2-TRP CJTs (with or without indication of 2 TRPs), 3-TRP CJTs (with or without indication of 3 TRPs), and 4-TRP CJTs.

[0159] In the example in Figure 14, four CMRs (CSI-RS resources #1, #4, #5, #8) are configured within CSI-ReportConfig according to option 1-1 described 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 a reference CSI. The second CJT CSI includes a CRI based on CSI-RS resource #4 and a single TRP CSI, and 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 a 2-TRP CQI / 3-TRP CQI. The fourth CJT CSI includes the CRI and single TRP CSI based on CSI-RS resource #8, as well as 2-TRP CQI / 3-TRP CQI / 4-TRP CQI.

[0160] Whether or not a new x-TRP CQI is reported within an x-TRP CJT CSI may be configured within the RRC IE (CSI-ReportConfig).

[0161] In options 1-2 described above, one CSI report may correspond to each of the X associated CSI-ReportConfigs. In this case, options 3-A / 3-B / 3-C / 3-D may be applied with the following differences. The first, second, third, and fourth CJT CSI contents within options 3-A / 3-B / 3-C / 3-D may be reported in separate CSI reports for the corresponding CSI-ReportConfig. In this case, a CRI report may not be required within each CSI report. Within each CSI report, a reference CSI indicator may be explicitly indicated along with the new content of one CJT CSI. For a CSI report 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.

[0162] According to this embodiment, the UE can properly report the CJT CSI.

[0163] <Fourth Embodiment> This embodiment relates to codebooks / CSI / quantization.

[0164] A new codebook table (quantization table) for new reporting content in the third embodiment may be specified.

[0165] A new table may be defined for the inter-TRP amplitude codebook, or an existing table (e.g., Figures 1 / 2) may be reused. Figure 15 shows an example of a new table for the inter-TRP amplitude codebook. For example, when M=3, 2 bits are used for display / reporting, and 4 values ​​can be displayed / reported. For example, when M=4, 3 bits are used for display / reporting, and 8 values ​​can be displayed / reported.

[0166] A new table may be defined for the TRP inter-phase codebook, or an existing table (e.g., Figure 1 / Figure 2) may be reused. Figure 16 shows an example of a new table for the TRP inter-phase codebook. For example, when P=4, 2 bits are used for display / reporting, and 4 values ​​can be displayed / reported. For example, when P=8, 3 bits are used for display / reporting, and 8 values ​​can be displayed / reported. For display / reporting of the phase, the range [0, 2π) may be divided into P parts (φ l,i = exp(j2πc i / P),c i (∈{0,...,P-1}).

[0167] A new table may be defined for the TRP coefficient codebook (TRP codebook). Figure 17 shows an example of a new table for the TRP coefficient codebook. Each value may include both amplitude and phase.

[0168] According to this embodiment, the UE can appropriately quantize the CJT CSI.

[0169] <Fifth Embodiment> This embodiment relates to CSI Part 1 / 2 and mapping sequence.

[0170] In option 1-1 described above, a delimiter between CSI Part 1 and CSI Part 2 may be specified for a new CJT CSI report for one TRP for one CSI-ReportConfig.

[0171] The x-TRP CQI may be located in either CSI Part 1 or CSI Part 2.

[0172] A new mapping sequence table for one or more CSI fields in one CSI report for CSI Part 1 and a new mapping sequence table for one or more CSI fields in one CSI report for CSI Part 2 may be specified. For example, the CRI may be at the beginning of Part 1, and the TRP inter-coefficient (phase / amplitude) index may be at the end of Part 2.

[0173] The mapping order of one or more CSI fields in CSI Part 1 for a CJT CSI to a single TRP may follow the following: • CRI (if reported) • Reference CSI indicator (if reported) • Rank Indicator (RI) • Channel Quality Indicator (CQI) (Single TRP CQI or x-TRP CQI, depending on the configuration) • Number of non-zero amplitude coefficients

[0174] This CSI Part 1 may have a fixed payload size.

[0175] The mapping order of one or more CSI fields in CSI Part 2 for a CJT CSI to a single TRP may follow the following: • Oversampling factor • Multiple indexes based on 2D-DFT • Index M of the initial DFT basis for the selected DFT window initial • Selected DFT basis for each layer • Bitmap for each layer • Non-zero LC coefficients (phase and amplitude) for each layer • Strongest (maximum intensity) coefficient indicator for each layer • Amplitude of the strongest coefficient for each layer / polarization • Index of inter-TRP amplitude for each layer (each polarization) (if reported) • TRP interphase index for each layer (each polarization) (if reported) • Index of TRP inter-coefficients for each layer (each polarization) (if reported) • Additional x-TRP CQI (if reported) (may be included in CSI Part 1)

[0176] The first, second, third, and fourth CJT CSI items may be present in a single CSI report.

[0177] The CSI report may follow either option 5-1 or 5-2 below.

[0178] [Option 5-1] A CSI Part 1 for each of the 1st, 2nd, 3rd, and 4th CJT CSIs may include the content of the aforementioned "One CSI Part 1 for each CJT CSI for each TRP". A CSI Part 2 for each of the 1st, 2nd, 3rd, and 4th CJT CSIs may include the content of the aforementioned "One CSI Part 2 for each CJT CSI for each TRP".

[0179] Figure 18A shows an example of CSI Parts 1 and 2 for 4-TRP CJT CSIs. Following the aforementioned "One CSI Part 1 for a CJT CSI for a 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. Following the aforementioned "One CSI Part 2 for a CJT CSI for a 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.

[0180] [Option 5-2] CSI Part 1 may include the content of the aforementioned "One CSI Part 1 for a CJT CSI for a Single TRP" for the reference (first) CJT CSI. CSI Part 2 may include other content.

[0181] Figure 18B shows an example of CSI Parts 1 and 2 for 4-TRP CJT CSIs. Following the previously mentioned "One CSI Part 1 for a CJT CSI for a TRP", CSI Part 1 for the first TRP (CJT CSI) is reported. Following the previously mentioned "One CSI Part 2 for a CJT CSI for a TRP", CSI Part 2 for the first TRP (CJT CSI) is reported. Following the previously mentioned "One CSI Part 1 for a CJT CSI for a TRP" and "One CSI Part 2 for a CJT CSI for a 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.

[0182] In a new mapping sequence table for one or more CSI fields of a single CSI report for CSI Part 1 / 2, the CSIs may be placed in TRP order (1st CJT CSI, 2nd CJT CSI, 3rd CJT CSI, 4th CJT CSI).

[0183] According to this embodiment, the UE can properly report the CJT CSI.

[0184] <Sixth Embodiment> This embodiment relates to CSI Part 2.

[0185] For the aforementioned "one CSI Part 2 for one TRP for one CJT CSI", the grouping of CSI Part 2 (based on the aforementioned groups 0 / 1 / 2) may follow either of the following options 6-1 and 6-2.

[0186] [Option 6-1] A new index of amplitude / phase / coefficient between TRPs may be placed in group 2.

[0187] For example, the aforementioned 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), and indices of amplitude / phase / coefficient between TRPs for each layer.

[0188] [Option 6-2] A new group 3 may be introduced. A new index of amplitude / phase / coefficient between TRPs may be placed in group 3. In CSI omission, group 3 may have a lower priority than group 2.

[0189] For example, in addition to the aforementioned groups 0 to 2, the following group 3 may also be defined. Group 3: Index of amplitude / phase / coefficient between TRPs for each layer

[0190] If an x-TRP CQI is located in CSI Part 2, that x-TRP CQI may be placed in Group 0 or 1, which has a higher priority.

[0191] In the aforementioned Option 5-2, "CSI Parts 1 and 2 for 4-TRP CJT CSIs," the content of the original CSI Part 1 for a CJT CSI (the second / third / fourth CJT CSI) for a single TRP is contained within CSI Part 2. The content of the original CSI Part 1 may also be placed within Group 0 in CSI Part 2.

[0192] If Group 3 is introduced, the priority reporting level for Part 2 CSI may be changed.

[0193] The relationship between CSI Part 2 priority and the CSI Part 2 mapping sequence table may follow the following: N Rep This could also be the number of CSI reports. • Priority 0: CSI Report 1 to N Rep For CSI reports set to 'typeII-r16' or 'typeII-PortSelection-r16' or 'xx-CJT-r18', Group 0 CSI; for CSI reports set to other, Part 2 Wideband CSI • Priority 1: Group 1 CSI for CSI Report 1 if set to 'typeII-r16', 'typeII-PortSelection-r16', or 'xx-CJT-r18'; Part 2 subband CSI for even-numbered subbands for CSI Report 1 if set to anything else. • Priority 2: Group 2 CSI for CSI Report 1 if set to 'typeII-r16', 'typeII-PortSelection-r16', or 'xx-CJT-r18'; Part 2 subband CSI for odd-numbered subbands for CSI Report 1 if set to anything else. • Priority 3: Group 3 CSI for CSI Report 1 if set to 'typeII-r16', 'typeII-PortSelection-r16', or 'xx-CJT-r18'; Part 2 subband CSI for odd-numbered subbands if set to anything else for CSI Report 1 • Priority 4: Group 1 CSI for CSI Report 2 if set to 'typeII-r16', 'typeII-PortSelection-r16', or 'xx-CJT-r18'; Part 2 subband CSI for even-numbered subbands for CSI Report 1 if set to anything else. • Priority 5: Group 2 CSI for CSI Report 2 if set to 'typeII-r16', 'typeII-PortSelection-r16', or 'xx-CJT-r18'; Part 2 subband CSI for odd-numbered subbands for CSI Report 1 if set to anything else. • Priority 6: Group 3 CSI for CSI Report 2 if set to 'typeII-r16', 'typeII-PortSelection-r16', or 'xx-CJT-r18'; Part 2 subband CSI for odd-numbered subbands for CSI Report 1 if set to anything else. Priorities 7 and above may be defined according to the same rules as priorities 1 through 6.

[0194] For priorities 1 through 3, if set to 'xx-CJT-r18', the mapping order of CSIs from groups 1 through 3 to CSI report 1 may follow either mapping order 1 or 2 below.

[0195] [Mapping Order 1] • Group 1 CSI for TRP of the 1st CJT CSI • Group 1 CSI for TRP of the 2nd CJT CSI • Group 1 CSI for TRP of the 3rd CJT CSI • CSI Report 1 for TRP of the 4th CJT CSI Group 1 CSI • Group 2 CSI for CSI Report 1 to TRP of the 1st CJT CSI • Group 2 CSI for TRP of the 2nd CJT CSI • Group 2 CSI for CSI Report 1 to TRP of the 3rd CJT CSI • CSI Report 1 for TRP of the 4th CJT CSI Group 2 CSI • Group 3 CSI for CSI Report 1 to TRP of the 1st CJT CSI · Group 3 CSI for CSI Report 1 with respect to the TRP of the second CJT CSI · Group 3 CSI for CSI Report 1 with respect to the TRP of the third CJT CSI · Group 3 CSI for CSI Report 1 with respect to the TRP of the fourth CJT CSI

[0196] [Mapping Order 2] · Group 1 CSI for CSI Report 1 with respect to the TRP of the first CJT CSI · Group 2 CSI for CSI Report 1 with respect to the TRP of the first CJT CSI · Group 3 CSI for CSI Report 1 with respect to the TRP of the first CJT CSI · Group 1 CSI for CSI Report 1 with respect to the TRP of the second CJT CSI · Group 2 CSI for CSI Report 1 with respect to the TRP of the second CJT CSI · Group 3 CSI for CSI Report 1 with respect to the TRP of the second CJT CSI · Group 1 CSI for CSI Report 1 with respect to the TRP of the third CJT CSI · Group 2 CSI for CSI Report 1 with respect to the TRP of the third CJT CSI · Group 3 CSI for CSI Report 1 with respect to the TRP of the third CJT CSI · Group 1 CSI for CSI Report 1 with respect to the TRP of the fourth CJT CSI · Group 2 CSI for CSI Report 1 with respect to the TRP of the fourth CJT CSI · Group 3 CSI for CSI Report 1 with respect to the TRP of the fourth CJT CSI

[0197] According to this embodiment, the UE can appropriately report the CJT CSI.

[0198] <Other Embodiments> 《UE Capability Information / Upper Layer Parameters》 Higher layer parameters (RRC IE) / UE capabilities may be defined corresponding to the functions (features) in each of the above embodiments. The higher layer parameters may indicate whether or not to enable the function. The UE capabilities may indicate whether or not the UE supports the function.

[0199] A UE that has the corresponding higher-level parameter set may perform that function. It may also be stipulated that "a UE that does not have the corresponding higher-level parameter set may not perform that function (for example, according to Rel. 15 / 16)."

[0200] A UE that reports / submits UE capability indicating support for that function may perform that function. It may be stipulated that "a UE that has not reported UE capability indicating support for that function shall not perform that function (e.g., in accordance with Rel. 15 / 16)."

[0201] If the UE reports / sends a UE capability indicating support for that function, and the corresponding higher-layer parameters are set, the UE may perform that function. It may also be stipulated that "if the UE does not report / send a UE capability indicating support for that function, or if the corresponding higher-layer parameters are not set, the UE shall not perform that function (e.g., in accordance with Rel. 15 / 16)."

[0202] Which of the above multiple embodiments / options / choices / features is used may be set by higher-layer parameters, reported by the UE as UE capability, specified in the specification, or determined by the reported UE capability and the setting of the higher-layer parameters.

[0203] UE capability may indicate whether the UE supports at least one of the following features: • Reporting of TRP amplitude. One or more codebooks with different quantization granularities. • Reporting of inter-TRP phase. One or more codebooks with different quantization granularities. • Reporting of TRP coefficients (including both amplitude and phase). One or more codebooks with different quantization granularities. • Reference CSI indicator report. • Reporting of x-TRP CQI (aggregated CJT CQI). Reporting of x-TRP CQI as an alternative to single TRP CQI. Reporting of x-TRP CQI in addition to single TRP CQI. Reporting of x-TRP designations such as x-TRP CQI.

[0204] UE capability may represent at least one of the following values: The value of x in x-TRP CJT. The maximum value of x in x-TRP CJT.

[0205] Based on the above UE capabilities / higher layer parameters, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0206] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0207] Figure 19 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0208] Furthermore, the wireless communication system 1 may 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)), and so on.

[0209] 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.

[0210] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0211] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0212] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).

[0213] Each CC may be included in at least one of the first frequency range (Frequency Range 1 (FR1)) and the second frequency range (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 higher than 24 GHz (above-24 GHz). Note that the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0214] Also, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0215] The plurality of base stations 10 may be connected by wire (e.g., an optical fiber compliant with Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the upper-level 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.

[0216] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0217] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0218] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. 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), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0219] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0220] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0221] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0222] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0223] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0224] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0225] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0226] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0227] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0228] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0229] 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, as DL-RS, 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.

[0230] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0231] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0232] (base station) Figure 20 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0233] In this example, the functional blocks of the characteristic parts of this 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 part described below may be omitted.

[0234] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0235] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. 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 also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0236] The transmitting / receiving 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 transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0237] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0238] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0239] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0240] The transmitting / receiving unit 120 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0241] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0242] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0243] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0244] 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 130.

[0245] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0246] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to 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 also measure received power (e.g., Reference Signal Received Power (RSRP)), reception 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.

[0247] The transmission path interface 140 may send and receive signals (backhaul signaling) with 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.

[0248] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0249] The transmitting / receiving unit 120 may transmit a setting indicating X channel measurement resources for X transmit / receive points (TRPs) for coherent joint transmission. The control unit 110 may control the reception of measurement reports for the X channel measurement resources based on the setting.

[0250] The transmitting / receiving unit 120 may transmit a setting indicating X channel measurement resources for X transmit / receive points (TRPs) for coherent joint transmission. Based on the setting, the control unit 110 may control the reception of a CSI report containing X channel status information (CSI) corresponding to each of the X channel measurement resources.

[0251] The transmitting / receiving unit 120 may transmit a setting indicating X channel measurement resources for X transmit / receive points (TRPs) for coherent joint transmission. The control unit 110 may control the reception of channel status information (CSI) part 1 and CSI part 2 reports based on the setting.

[0252] (User terminal) Figure 21 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0253] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, 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 part described below may be omitted.

[0254] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0255] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0256] The transmitting / receiving 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 transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0257] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0258] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0259] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0260] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0261] The transmitting / receiving unit 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 and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0262] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0263] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0264] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0265] 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.

[0266] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (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.

[0267] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0268] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0269] The transmitting / receiving unit 220 may receive a setting indicating X channel measurement resources for X transmit / receive points (TRPs) for coherent joint transmission. The control unit 210 may control the reporting of measurements for the X channel measurement resources based on the setting.

[0270] The above setting may represent at least one of X and X channel status information reporting settings.

[0271] The above setting may indicate multiple channel status information reference signal ports.

[0272] The above setting may indicate one or X interference measurement resources.

[0273] The transmitting / receiving unit 220 may receive a setting indicating X channel measurement resources for X transmit / receive points (TRPs) for coherent joint transmission. Based on the setting, the control unit 210 may control a CSI report including X channel status information (CSI) corresponding to each of the X channel measurement resources.

[0274] Each of the X CSIs may include a channel status information reference signal (CSI-RS) resource indicator (CRI) that indicates the corresponding channel measurement resource, and a CSI based on the corresponding channel measurement resource.

[0275] Each of the X CSIs may include an index that indicates at least one difference in phase and amplitude between multiple TRPs.

[0276] i is 2 or greater, and the i-th CSI may include an index that shows at least one difference between phase and amplitude between at least two of the channel measurement resources from 1 to i-1.

[0277] The transmitting / receiving unit 220 may receive a setting indicating X channel measurement resources for X transmit / receive points (TRPs) for coherent joint transmission. The control unit 210 may control the reporting of channel status information (CSI) part 1 and CSI part 2 based on the setting.

[0278] The 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 the corresponding channel measurement resource, and a reference CSI indicator indicating one of the X channel measurement resources.

[0279] The CSI Part 2 for one of the X TRPs may include at least one of the following: an index indicating at least one difference in phase and amplitude between the TRPs for at least one of the layer and polarization; and a channel quality indicator (CQI) based on the X TRPs.

[0280] The aforementioned index may be included in group 2 of groups 0 to 2, or in group 3 after group 2.

[0281] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0282] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0283] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 22 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0284] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0285] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0286] 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 the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0287] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0288] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0289] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0290] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital multipurpose disk, a Blu-ray disk), 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 called an auxiliary storage device.

[0291] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0292] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0293] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0294] 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), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0295] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0296] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist 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.

[0297] Here, the neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0298] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0299] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0300] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0301] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0302] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0303] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0304] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0305] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0306] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0307] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0308] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0309] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0310] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0311] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0312] A BWP may include UL BWPs (BWPs for UL) and DL BWPs (BWPs for DL). One or more BWPs may be configured within a single carrier for a UE.

[0313] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0314] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots within a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0315] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0316] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements that use these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0317] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0318] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0319] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0320] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0321] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0322] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not notifying the specified information or by notifying other information).

[0323] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0324] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0325] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0326] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0327] In this 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," and "panel" may be used interchangeably.

[0328] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0329] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0330] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0331] A mobile station may also be called 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 appropriate term.

[0332] 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. At least one of the base station and the mobile station may also be a device mounted on a moving object, the moving object itself, etc.

[0333] The term "mobile object" refers to any movable object, regardless of its speed, and naturally includes cases where the mobile object is stationary. Examples of such mobile objects include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and items carried on them. Furthermore, such mobile objects may be autonomously driven objects operating based on operational commands.

[0334] The mobile entity may be a vehicle (e.g., a car, an airplane), an unmanned mobile entity (e.g., a drone, an autonomous vehicle), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0335] Figure 23 shows an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a pneumatic 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.

[0336] The drive unit 41 consists of, for example, at least one of an engine, a motor, or an engine-motor hybrid. 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.

[0337] The electronic control unit 49 consists of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 installed in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0338] Signals from various sensors 50-58 include current signals from current sensor 50 for sensing motor current, rotational speed signals of front wheels 46 / rear wheels 47 acquired by rotational speed sensor 51, air pressure signals of front wheels 46 / rear wheels 47 acquired by air pressure sensor 52, vehicle speed signals acquired by vehicle speed sensor 53, acceleration signals acquired by acceleration sensor 54, accelerator pedal depression signal of accelerator pedal 43 acquired by accelerator pedal sensor 55, brake pedal depression signal of brake pedal 44 acquired by brake pedal sensor 56, operation signals of shift lever 45 acquired by shift lever sensor 57, and detection signals for detecting obstacles, vehicles, pedestrians, etc., acquired by object detection sensor 58.

[0339] The information service unit 59 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, displays, television, and radio, and one or more ECUs that control these devices. The information service unit 59 uses information acquired from external devices via a communication module 60 or the like to provide various types of information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0340] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0341] The driver assistance system unit 64 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, 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 Unit (IMU), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driver assistance functions or autonomous driving functions.

[0342] 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 sends and receives data (information) via the communication port 63 to the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40.

[0343] 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 external devices. For example, it can send and receive various types of information to and from external devices 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 base station 10 or the user terminal 20 described above. Alternatively, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 (it may function as at least one of the base station 10 and the user terminal 20).

[0344] The communication module 60 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above input.

[0345] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 installed in the vehicle. The information service unit 59 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[0346] 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, axle 48, various sensors 50-58, etc., which are provided in the vehicle 40.

[0347] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this 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), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel and downlink channel may be interpreted as sidelink channel.

[0348] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0349] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0350] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0351] Each aspect / embodiment described in this disclosure includes 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 (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may apply to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that are extended, modified, created, or defined based on these. It may also apply to combinations of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0352] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0353] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0354] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0355] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0356] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0357] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0358] The term "maximum transmit power" as used in this disclosure may mean the maximum transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0359] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0360] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0361] In this 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 "combine" may be interpreted similarly to "different."

[0362] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0363] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0364] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

Claims

1. A control unit that controls the transmission of capability information indicating support for a codebook for coherent joint transmission (CJT), The system includes a receiving unit that receives channel status information (CSI) reporting settings, which indicate the codebook type as the codebook for the CJT and set up X channel measurement resources (CMR), The aforementioned capability information is a terminal that shows the maximum value of X.

2. The steps include controlling the transmission of capability information indicating support for codebooks for coherent joint transmission (CJT), The step of receiving a channel status information (CSI) report setting, which specifies the codebook type as the codebook for the CJT and sets up X channel measurement resources (CMR), The capability information indicates the maximum value of X, and is a wireless communication method for a terminal.

3. A receiving unit that receives capability information indicating support for a codebook for coherent joint transmission (CJT), The system includes a control unit that specifies the codebook type as the codebook for the CJT and controls the transmission of a channel status information (CSI) reporting setting that sets up X channel measurement resources (CMRs), The aforementioned capability information is a base station that shows the maximum value of X.

4. A system having terminals and base stations, The aforementioned terminal is A control unit that controls the transmission of capability information indicating support for a codebook for coherent joint transmission (CJT), The system includes a receiving unit that receives channel status information (CSI) reporting settings, which indicate the codebook type as the codebook for the CJT and set up X channel measurement resources (CMR), The aforementioned capability information indicates the maximum value of X, The aforementioned base station is A system having a receiving unit that receives the aforementioned capability information.

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