Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect disclosed herein comprises: a reception unit that receives a setting relating to one or more spatial domain (SD) vectors mapped to one or more layers; and a control unit that reports channel state information (CSI) about a domain different from the SD on the basis of the one or more SD vectors. According to one aspect disclosed herein, it is possible to appropriately measure / report CSI.

Description

Terminal, wireless communication method, and base station

[0001] This disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was specified with the aim of achieving even higher data rates and lower latency (Non-Patent Literature 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of further increasing the 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) are also being considered.

[0004] 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

[0005] In future wireless communication systems (e.g., 6G), it is being considered that terminals (user terminals, User Equipment (UE)) will measure and report channel status information (CSI) based on a codebook set by the network (NW).

[0006] However, a method for configuration / indication for this codebook has not been sufficiently studied. If such configuration / indication is not sufficiently studied, there is a risk of causing reduction in communication quality / throughput and the like.

[0007] Accordingly, one of the objects of the present disclosure is to provide a terminal, a radio communication method, and a base station that appropriately measure / report CSI.

[0008] A terminal according to one aspect of the present disclosure has a reception section that receives a configuration related to one or more spatial domain (SD) vectors mapped to one or more layers, and a control section that reports channel state information (CSI) of a domain different from the SD based on the one or more SD vectors.

[0009] According to one aspect of the present disclosure, CSI can be appropriately measured / reported.

[0010] Figure 1 shows i in 2-layer CSI reporting 1,3 shows an example of mapping from to k1 and k2. Figure 2 shows i in 3-layer and 4-layer CSI reporting 1,3Figure 3 shows an example of mapping from k1 to k2. Figure 4 shows an example of near-field (NF) and far-field (FF) mapping. Figure 5A and 5B show an example of a configurable codebook and other domain information according to embodiments 1-1 and 1-2. Figures 6A and 6B show an example of a configurable codebook and other domain information according to embodiments 1-3 and 1-4. Figures 7A-7C show an example of one or more vectors included in the full set according to option 1 of the second embodiment. Figures 8A-8C show an example of specifying an SD vector by index according to embodiment 3-1. Figures 9A and 9B show an example of mapping between an SD vector and a layer according to Alt. 1 of the fourth embodiment. Figures 10A-10D show an example of mapping between an SD vector and a layer according to Alt. 2 of the fourth embodiment. Figure 11 is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment of the present disclosure. Figure 12 is a diagram showing an example of a base station configuration according to one embodiment of the present disclosure. Figure 13 is a diagram showing an example of the configuration of a terminal according to one embodiment of the present disclosure. Figure 14 is a diagram showing an example of the hardware configuration of a base station and a terminal according to one embodiment of the present disclosure.

[0011] (CSI Reporting) Rel. 15 In NR, a terminal (also called a user terminal, User Equipment (UE), etc.) generates (also called determining, calculating, estimating, measuring, etc.) Channel State Information (CSI) based on a Reference Signal (RS) (or a resource for said RS), and transmits (also called reporting, 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 for generating CSI may be, for example, at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), a DeModulation Reference Signal (DMRS), and the like.

[0013] The CSI-RS may include at least one of a Non Zero Power (NZP) CSI-RS and CSI-Interference Management (CSI-Interference Measurement, CSI-IM). The SS / PBCH block is a block including the SS and the PBCH (and the corresponding DMRS), and may be referred to as an SS block (SSB) or the like. Further, the SS may 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, SSB Index), 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), L1-SNR (Signal to Noise Ratio).

[0015] The UE may receive information regarding CSI reporting (report configuration information) and control CSI reporting based on that report configuration information. This report configuration information may be, for example, the "CSI-ReportConfig" information element (IE) of Radio Resource Control (RRC).

[0016] The reporting configuration information (for example, "CSI-ReportConfig" in RRC IE) may include, for example, at least one of the following: ◆ Information about the type of CSI report (report type information, for example, "reportConfigType" in RRC IE) ◆ Information about one or more quantities (one or more CSI parameters) of CSI to be reported (report quantity information, for example, "reportQuantity" in RRC IE) ◆ Information about the RS resources used to generate the quantity (the CSI parameter) (resource information, for example, "CSI-ResourceConfigId" in RRC IE) ◆ Information about the frequency domain to which the CSI report is applied (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-mentioned CSI parameters (e.g., CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0019] Furthermore, the resource information may also be the ID of the RS resource. The RS resource 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 (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 PMI or subband PMI). Based on at least one of the above-mentioned reporting quantity information and frequency domain information, the UE may determine the frequency granularity of the CSI report (i.e., whether to report wideband PMI or subband PMI).

[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 subband indication i2 (e.g., subband indication for each subband) may be reported for one or more subbands 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 a 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 CSIs. 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. A single beam may be rephrased as a single layer, and a multi-beam as multiple beams. Furthermore, a Type 1 CSI may not assume multi-user multiple input multiple output (MU-MIMO), while a Type 2 CSI may assume multi-user MIMO.

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

[0028] The Upbound Control Information (UCI) type may include at least one of Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), scheduling request (SR), or CSI. The UCI may be carried by PUCCH or by PUSCH.

[0029] In Rel. 15 NR, the UCI may include one CSI part for wideband PMI feedback. CSI report #n includes PMI wideband information, if reported.

[0030] 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.

[0031] 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 a resource setting for channel measurement (resourcesForChannelMeasurement), a CSI-IM resource setting for interference (csi-IM-ResourceForInterference), an NZP-CSI-RS resource setting for interference (nzp-CSI-RS-ResourceForInterference), and a report quantity (reportQuantity). Each of the resource settings for channel measurement, the CSI-IM resource setting for interference, and the NZP-CSI-RS setting 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).

[0032] 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.

[0033] 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.

[0034] In this disclosure, CSI-RS, periodic CSI-RS (P-CSI-RS), semi-persistent CSI-RS (SP-CSI-RS), and aperiodic CSI-RS (AP-CSI-RS, A-CSI-RS) may be interpreted interchangeably. In this disclosure, CSI-RS, periodic CSI reporting (P-CSI reporting), semi-persistent CSI reporting (SP-CSI reporting), and aperiodic CSI reporting (AP-CSI reporting, A-CSI reporting) may be interpreted interchangeably.

[0035] (CSI-RS port) In Rel. 15, CSI-RS is used as a DL RS for at least one of channel state information (CSI) acquisition, beam management (BM), beam failure recovery (BFR), and fine tracking of time and frequency. CSI-RS supports 1, 2, 4, 8, 12, 16, 24, and 32 ports (antenna ports, CSI-RS ports). CSI-RS supports periodic, semi-persistent, and aperiodic transmissions. The frequency density of the CSI-RS is configurable to adjust overhead and CSI estimation accuracy.

[0036] The specification defines a table showing the CSI-RS locations within a slot. Each row in the table shows the row number, port number, frequency domain density, CDM type, time and frequency (time / frequency) location (component resource location (k-bar, l-bar)), code division multiplexing (CDM) group index, and the location of each resource within the component resource ((RE, symbol), (k', l')). Here, the time / frequency location is the location of the CSI-RS time and frequency resource (component resource) corresponding to one port. The k-bar is a notation with an overlined "k". The k-bar indicates the starting resource element (RE) index of the component resource, and the l-bar indicates the starting symbol (OFDM symbol) index of the component resource.

[0037] The CDM group includes no CDM (N / A), FD-CDM2, CDM4, and CDM8. FD-CDM2 multiplexes two-port CSI-RS at the same time and frequency by multiplying a 2-length frequency domain (FD)-orthogonal cover code (OCC) in RE units (FD2). CDM4 multiplexes four-port CSI-RS at the same time and frequency by multiplying a 2-length FD-OCC and a 2-length time domain (TD)-OCC in RE units and symbol units (FD2TD2). CDM8 multiplexes eight-port CSI-RS at the same time and frequency by multiplying a 2-length FD-OCC and a 4-length TD-OCC in RE units and symbol units (FD2TD4).

[0038] (CSI Reporting Configuration) The CSI reporting configuration (CSI-ReportConfig) includes the codebook configuration (CodebookConfig), channel measurement resource (CMR), interference measurement resource (IMR), etc. The IMR may be at least one of zero power-interference measurement resource (ZP-IMR) and non-zero power-interference measurement resource (NZP-IMR).

[0039] The UE (User Environment) configures the codebook (CB) parameters (CodebookConfig) through higher-layer signaling (RRC signaling). The codebook configuration is included in the higher-layer (RRC) parameter CSI-ReportConfig.

[0040] In the codebook configuration, at least one codebook is selected from among several codebooks, including Type I Single Panel (typeI-SinglePanel), Type I Multi Panel (typeI-MultiPanel), Type II, and Type II Port Selection (typeII-PortSelection, PS).

[0041] The codebook parameters include parameters related to codebook subset restrictions (CBSRs) ("...Restriction" in CodebookConfig). 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.

[0042] In the present disclosure, a codebook (CB), a Type 1 / Type 2 / Type 2PS CB, an extended CB based on a Type 1 / Type 2 / Type 2PS CB, CSI, and PMI may be read interchangeably with each other.

[0043] In the present disclosure, CMR, NZP CSI-RS resource, and resourcesForChannelMeasurement may be read interchangeably with each other. In the present disclosure, ZP-IMR, CSI-IM resource, and csi-IM-ResourcesForInterference may be read interchangeably with each other. In the present disclosure, NZP-IMR, NZP CSI-RS resource for interference measurement, and nzp-CSI-RS-ResourcesForInterference may be read interchangeably with each other.

[0044] (PMI / Type 1 Codebook) As the Type 1 (type I) codebook (Rel. 15), a Type 1 single-panel codebook and a Type 1 multi-panel codebook are defined for the base station panel. In the Type 1 single-panel, an antenna model (antenna configuration) of the CSI antenna port array (logical configuration) is defined for (N1, N2). Number of CSI-RS antenna ports P CSI-RS is 2N1N2. In the Type 1 multi-panel, number of CSI-RS antenna ports P CSI-RS and (N g , N1, N2), an antenna model of the CSI antenna port array (logical configuration) is defined.

[0045] In the present disclosure, the first dimension, the N1 dimension, one of the horizontal domain and the vertical domain, and the horizontal domain may be read interchangeably with each other. In the present disclosure, the second dimension, the dimension perpendicular to the first dimension, the N2 dimension, the other of the horizontal domain and the vertical domain, and the vertical domain may be read interchangeably with each other. In the present disclosure, N1 and N2 may be interchanged with each other, and the horizontal domain and the vertical domain may be interchanged with each other.

[0046] In this disclosure, the terms N1 x N2 DFT vector, spatial domain (SD) vector, 2D-DFT vector, SD DFT vector, SD basis vector, SD beam, SD basis, precoder, beam, and vector may be interpreted as interchangeable.

[0047] In this disclosure, the terms port, antenna port, CSI-RS port, port index, and port number may be interpreted interchangeably.

[0048] In this disclosure, (N1, N2), the number of antenna ports in two dimensions, the antenna configuration, and the base station antenna layout may be interpreted as interchangeable. g In this disclosure, the number of panels, the number of antenna groups, and the number of antenna port groups may be interpreted as mutually interchangeable. In this disclosure, N1, the number of antennas in the first dimension, and the number of antenna ports in the first dimension may be interpreted as mutually interchangeable. In this disclosure, N2, the number of antennas in the second dimension, and the number of antenna ports in the second dimension may be interpreted as mutually interchangeable. In this disclosure, O1, the number of oversamplings in the first dimension, and O2, the number of oversamplings in the second dimension may be interpreted as mutually interchangeable. In this disclosure, N1O1, the number of beams in the first dimension, and the number of vectors in the first dimension may be interpreted as mutually interchangeable. In this disclosure, N2O2, the number of beams in the second dimension, and the number of vectors in the second dimension may be interpreted as mutually interchangeable.

[0049] In this disclosure, two polarizations, a first polarization and a second polarization, horizontal polarization and vertical polarization may be interpreted as interchangeable. In this disclosure, one polarization, one of the first polarization and the second polarization, and one of the horizontal polarization and vertical polarization may be interpreted as interchangeable. In this disclosure, co-phasing, phase difference, phase compensation between polarizations, and φ may be interpreted as interchangeable.

[0050] In the present disclosure, Type 1 codebook, Type 1 single-panel codebook (codebookType='typeI-SinglePanel'), and Type 1 multi-panel codebook (codebookType='typeI-MultiPanel') may be read interchangeably with each other.

[0051] ((Type 1 Single-Panel (SP) Codebook)) For Rel-15 Type 1 single-panel CSI, the UE has the higher layer parameter for codebook type (subType in type1 in codebookType in CodebookConfig) set to Type 1 single-panel ('typeI-SinglePanel'). If the number of layers v is not in {2,3,4}, the PMI value corresponds to three codebook indices i 1,1 ,i 1,2 ,i2. If the number of layers v is in {2,3,4}, the PMI value corresponds to four codebook indices i 1,1 ,i 1,2 ,i 1,3 ,i2. If the number of layers v is not in {2,3,4}, the composite codebook index i1=[i 1,1 i 1,2 . If the number of layers v is in {2,3,4}, the composite codebook index i1=[i 1,1 i 1,2 i 1,3 .

[0052] For P CSI-RS , the supported configurations (value combinations) of (N1,N2) and (O1,O2) are specified in the standard. (N1,N2) denotes the number of two-dimensional (2D) antenna elements, and is configured by the higher layer parameter n1-n2 in moreThanTwo in nrOfAntennaPorts in typeI-SinglePanel. n1-n2 is a bitmap parameter of N1O1N2O2 bits. (O1,O2) are 2D oversampling factors.

[0053] The precoding matrix for v=1 is W l,m,n(v) It is expressed as follows. The precoding matrix for v=2 is W l,l',m,m',n (v) It is expressed as P CSI-RS The precoding matrix for <16 and v=3,4 is W l,l',m,m',n (v) It is expressed as P CSI-RS The precoding matrix for ≥16 and v=3,4 is W l,m,p,n (v) It is expressed as follows. The precoding matrix for v=5,6 is W l,l',l'',m,m',m'',n (v) It is expressed as follows. The precoding matrix for v=7,8 is Wl,l',l'',l''',m,m',m'',m''',n (v) It is expressed as follows: l,l',l'',l''' is i 1,1 and are determined by k1. m,m',m'',m''' are i 1,2 n is determined by and k2. n is determined by i2. p is P CSI-RS Of the (≥16) ports, the first half of the ports are 0 and the second half of the ports are 1.

[0054] The precoding matrix W can be expressed as the product of two matrices W1W2. W1 represents the wideband and long-term channel properties, and the codebook index i1 (for example, i 1,1 and i 1,2 It is represented by i. 1,1 and i 1,2 The beam selection in two dimensions is shown, respectively. W2 represents the frequency selectivity (subband) and short-term channel characteristics, and is represented by the codebook index i2. i2 may also represent the phase adjustment between the two polarizations. W1 may also be given by the following equation E1 using matrix B.

[0055] B represents L 2D DFT beams, each oversampled by (O1,O2).

[0056] If the rank is {1, 5, 6, 7, 8}, the codebook index for each PMI is i 1,1 ,i 1,2 , i2. If the rank is {2, 3, 4}, the codebook index for each PMI is i 1,1 ,i 1,2 ,i 1,3 i2. 1,3 These are mapped to k1 and k2 according to the specification table. At ranks 2, 3, and 4, the beams selected for different layers may differ when generating the PMI.

[0057] For a 1-layer CSI report and codebook mode (codebookMode) = 1, the codebook corresponds to index i, which represents the horizontal component of the beam. 1,1 =l=0,1,...,N1O1-1, and index i corresponding to the vertical component of the beam. 1,2 Includes =m=0,1,...,N2O2-1 and the corresponding subband indices i2=n=0,1,2,3. Antenna ports 3000 to 2999+P CSI-RS Precoding matrix W for one-layer CSI reporting using l,m,n (1) This is given by the following equation E2.

[0058] φ for precoding matrices n , θ p u m , v l,m , v ~ l,m This is given by the following equation E3.

[0059] Here, [i 1,1 ,i 1,2 [i2] = [l,m,n]. l,m This is the DFT vector (SD basis vector, SD beam) with N1 rows and N2 columns, expressed as exp(j2πln1 / O1N1)×exp(j2πmn2 / O2N2), where n1=0,1,...,N1-1 and n2=0,1,...,N2-1, and specified by v and l. l,mThis shows one beam. Phase adjustment φ between the two polarizations. n =exp(jπn / 2), which represents the phase difference of the second polarization relative to the phase of the first polarization. θ p This shows the phase of the second half of the port relative to the phase of the first half of the port.

[0060] ((Type 1 Multi-Panel (MP) Codebook)) For Rel. 15 Type 1 Multi-Panel CSI, the UE sets the higher-level parameter of the codebook type (subType within type1 within codebookType in CodebookConfig) to Type 1 Multi-Panel ('typeI-MultiPanel'). Compared to a Type 1 Single-Panel Codebook, Rel. 15 Type 1 Multi-Panel CSI has N1, N2 in addition to the number of panels N g This is set. Compared to the Type 1 single panel codebook, the inter-panel co-phasing (phase compensation between panels) is as follows: 1,4 The following is added and reported for each panel: the same SD beam (DFT vector v l,m The SD basis index (l,m) is selected, and only the inter-panel phase difference is added and reported.

[0061] P CSI-RS For the supported (N g The settings (combinations of values) for (N1,N2) and (O1,O2) are defined in the specification. (N1,N2) are set by ng-n1-n2 within typeI-MultiPanel. 1,1 =l={0,1,...,N1O1-1} represents the horizontal components of the oversampled SD basis. 1,2 =m={0,1,...,N2O2-1} is the vertical component of the oversampled SD basis. q=1,...,N g i for -1 1,4,q =p={0,1,2,3} represents the number of panels. i2=n={0,1,2,3} represents the number of beams per panel.

[0062] The antenna configuration parameters for the type 1 multi-panel codebook are ng-n1-n2 (N g , N1, N2). In existing specifications, up to rank 4 is supported, and rank 5 and above are not supported.

[0063] Each PMI value corresponds to codebook indices i1 and i2. v is the RI value (the number of layers). For v=1, i1=[i 1,1 i 1,2 i 1,4 . For v∈{2,3,4}, i1=[i 1,1 i 1,2 i 1,3 i 1,4 .

[0064] When the codebook mode is set to 1, for N g =2, i 1,4 =i 1,4,1 . For N g =4, i 1,4 =[i 1,4,1 i 1,4,2 i 1,4,3 . When the codebook mode is set to 2, i 1,4 =[i 1,4,1 i 1,4,2 . i 1,4 is related to the number of panels N g and the codebook mode. Codebook mode 2 is supported only for N g =2. [i in codebook mode 2 1,4,1 i 1,4,2 correspond to the two polarizations respectively. Each of the two values represents the wideband phase difference of the second panel (panel 1) relative to the first panel (panel 0) in the corresponding polarization. For N g =2 and codebook mode 1, only one value of i 1,4 is reported. This single value represents the wideband phase difference of the second panel (panel 1) relative to the first panel (panel 0).

[0065] When the codebook mode is set to 2, i2=[i 2,0 i2,1 i 2,2 . The number and value of i2 are related to the codebook mode, and may be different from those of the type 1 single-panel codebook. If subband reporting is configured, i2 is an index for a subband. If wideband reporting is configured, i2 is an index for a wideband. In codebook mode 1, the number and value of i2 are the same as those of the type 1 single-panel codebook, and i2 has one value for each subband. In codebook mode 2 (N g =2), the phase difference of the subband has three values, representing the phase difference between polarizations and the phase difference between panels.

[0066] Codebook mode 2 reports more phase differences for more accurate CSI, and thus has a larger feedback overhead. In addition, codebook mode 2 is supported only for N g =2.

[0067] The type 1 multi-panel codebook is based on the type 1 single-panel codebook. In the type 1 multi-panel codebook, the codebook of the first panel (panel 0) follows the type 1 single-panel codebook. The codebooks for other panels apply the same precoder, with an additional phase difference between the multiple panels.

[0068] φ for the precoding matrix n , a p , b p , u m , v l,m are given by the following equation E4.

[0069] The precoding matrix for v-layer CSI reporting using antenna ports 3000 to 2999+P CSI-RS is represented by W (v) . The precoding matrix for the i-th layer, the number of panels N g , and codebook mode X is represented by W l,m,p,n i,N_g,X . [i 1,1 ,i 1,2 ,i1,4 ,i2]=[l,m,p,n].

[0070] Codebook Modes 1 and N g For ={2,4}, the precoding matrix W for one-layer CSI reporting l,m,p,n (1) is, W l,m,p,n 1,N_g,1 Represented by Codebook Mode 1 and N g For ={2,4}, the precoding matrix W for two-layer CSI reporting is l,l',m,m',p,n (2) is (1 / sqrt(2))[W l,m,p,n (1,N_g,1) W l',m',p,n (2,N_g,1) It is represented by ]. Here, N g W for ={2,4} l,m,p,n 1,N_g,1 and W l,m,p,n 2,N_g,1 (N g W for =2 l,m,p,n 1,2,1 and W l,m,p,n 2,2,1 And, N g W for =4 l,m,p,n 1,4,1 and W l,m,p,n 2,4,1 And,) are given by the following equation E5.

[0071] Here, φ n =e jπn / 2 N g For =2, p=p1, N g For φ = 4, p = [p1, p2, p3]. p_1 , φ p_2 , φ p_3 This represents the inter-panel phase difference (inter-panel phase compensation). In each precoding matrix, the first and second rows correspond to the first panel (panel 0), the third and fourth rows correspond to the second panel (panel 1), the fifth and sixth rows correspond to the third panel (panel 2), and the seventh and eighth rows correspond to the fourth panel (panel 3). Since the same SD beam is selected for all panels, each row has the same v l,m It has. φ p_1This represents the phase difference between the second panel and the first panel. p_2 This represents the phase difference between the third panel and the first panel. p_3 This represents the phase difference between the fourth panel and the first panel.

[0072] Codebook Mode 2 and N g For =2, the precoding matrix W for one-layer CSI reporting. l,m,p,n (1) is, W l,m,p,n 1,2,1 Represented by Codebook Mode 2 and N g For =2, the precoding matrix W for two-layer CSI reporting l,l',m,m',p,n (2) is (1 / sqrt(2))[W l,m,p,n 1,2,2 W l',m',p,n 2,2,2 It is represented by ]. Here, W l,m,p,n 1,2,2 and W l,m,p,n 2,2,2 This is given by the following equation E6.

[0073] In each precoding matrix, the first and second rows correspond to the first panel (panel 0), and the third and fourth rows correspond to the second panel (panel 1). Since the same SD beam is selected for all panels, each row corresponds to the same v l,m It has p=[p1 p1] and n=[n0,n1,n2]. p_1 This represents the phase difference between the second panel (panel 1) and the first panel (panel 0) in the first polarization. p_2 This represents the phase difference between the second panel (panel 1) and the first panel (panel 0) in the second polarization. n_0 This represents the phase difference between the second polarization of the first panel and the first polarization of the first panel for each subband. n_1 This represents the phase difference between the first polarization of the second panel and the first polarization of the first panel for each subband. n_2 This represents the phase difference between the second polarization of the second panel and the first polarization of the first panel for each subband.

[0074] (PMI / Type 2 Codebook) In this disclosure, [Rel. 15] Type 2 codebook (codebookType='typeII'), [Rel. 15] Type 2 port selection (PS) codebook (codebookType='typeII-PortSelection'), [Rel. 16] Extended Type 2 codebook (codebookType='typeII-r16'), [Rel. 16] Extended Type 2 PS codebook (codebookType='typeII-PortSelection-r16'), [Rel. 17] Additional Extended Type 2 PS codebook (codebookType='typeII-PortSelection-r17'), [Rel. 18] Type 2 codebook for CJT (codebookType='typeII-CJT-r18'), [Rel. 18] Type 2 PS codebook for CJT (codebookType='typeII-CJT-PortSelection-r18'), [Rel. The [Type 2] codebook for Doppler (predictive PMI) (codebookType='typeII-Doppler-r18') and the [Rel. 18] [Type 2] PS codebook for Doppler (predictive PMI) (codebookType='typeII-Doppler-PortSelection-r18') may be interpreted as being interchangeable.

[0075] ((Type II Codebook)) For a Type II codebook (Rel. 15, Type II CSI), the UE sets the upper layer parameter codebookType to 'typeII'.

[0076] In this disclosure, a matrix Z with X rows and Y columns may be denoted as Z(X×Y).

[0077] For type 2 CSI in Rel. 15, the subband-wise precoding matrix for a given layer l is based on the following equation F1: W l (N t ×N3) = W1W 2,l (F1)

[0078] N t N is the number of antennas / antenna ports. N3 is the total number of precoding (beamforming) matrices (precoders) (number of subbands) indicated by PMI.

[0079] W1(N t ×2L) represents 2L DFT vectors (oversampled DFT vectors) and indicates the selected spatial domain basis. L∈{2,4} is the number of beams per layer. The actual number of beams considering two polarizations at one location is 2L. For example, the DFT vectors of L=2 SD beams are b i ,b j It may also be expressed as follows.

[0080] W 2,l (2L×N3) is a matrix (LC coefficient matrix) consisting of linear combination coefficients (linear combination (LC) coefficients, subband complex LC coefficients, combination coefficients) for layer l. 2,l This represents beam selection and the phase difference (co-phasing) between the two polarizations. For example, L = 2 SD beams b i ,b j The LC coefficients corresponding to each are c i ,c j For example, the channel vector h is a linear combination of L = 2 SD beams c i b i ,+c j b j It is approximated by the LC coefficient matrix W. The feedback overhead is mainly due to the LC coefficient matrix W. 2,l This is due to the following. Furthermore, Type 2 CSI in Rel. 15 only supports ranks 1 and 2.

[0081] In Type 2 CSI, the channel (channel matrix) for a given user is represented by a linear combination of two polarizations and L SD beams. Type 2 CSI Rel. 15 supports ranks 1 and 2.

[0082] The value of L is set using the upper layer parameter numberOfBeams (number of beams).

[0083] The L vectors joined by the codebook are as follows: 1,1 and i 1,2 Identified by i 1,1 =[q1 q2] q1∈{0,1,...,O1-1} q2∈{0,1,...,O2-1} i 1,2 ∈{0,1,..., N_1*N_2 C L -1} n1=[n1 (0) ,...,n1 (L-1) ] n2=[n2 (0) ,...,n2 (L-1) ] n1 (i) ∈{0,1,...,N1-1} n2 (i) ∈{0,1,...,N2-1} C(x,y) is such that x≧y x C y It is 0 for x < y.

[0084] ((Enhanced Type 2 Codebook (Rel. 16))) For Type 2 CSI (Enhanced Type 2 Codebook) Rel. 16, the UE sets the upper layer parameter codebookType to 'typeII-r16'.

[0085] Rel. 16 Type 2 CSI is compressed using frequency domain (FD) compression, resulting in the LC coefficient matrix W 2,l Reduces the overhead associated with it. Type 2 CSI Rel. 16 supports ranks 3 and 4 in addition to ranks 1 and 2.

[0086] In Type 2 CSI of Rel. 16, the precoding matrix W for a given layer l is given. l This is expressed by the following equation F2: W l = W1W ~ l W f,l H (F2)

[0087] W in Type 2 CSI of Rel. 15 2,l is, W ~ l W f,l H It is approximated by the matrix W. ~ It may also be represented by placing a tilde (~) above the W. ~ l is, W ~ 2,l It may also be expressed as: W f,l H is, W f,l The adjoint matrix of W f,l It is obtained by transposing the conjugate of .

[0088] For CSI reporting, the UE may set one of two subband sizes. That subband (CQI subband) is N PRB SB It is defined as a number of consecutive PRBs and may depend on the total number of PRBs in the BWP. The number of PMI subbands R per CQI subband is set by RRC IE (numberOfPMI-SubbandsPerCQI-Subband). R controls the total number N3 of precoding matrices represented by PMI as a function of the number of subbands set within the csi-ReportingBand, the subband size set by subbandSize, and the total number of PRBs in the BWP.

[0089] W1(N t The matrix (×2L) represents 2L DFT vectors. To represent this matrix, multiple indices of the SD basis and a two-dimensional over-sampling factor are reported.

[0090] W ~ l (2L x M) v ) is the LC coefficient matrix. To represent this matrix, up to K0 non-zero coefficients (NZCs, LC coefficients with non-zero amplitude) are reported. The report consists of two parts: a bitmap showing the NZC positions and the quantized NZCs.

[0091] W f,l (N3×M v ) is M for layer l. v The DFT vectors (frequency domain (FD), DFT vector, FD basis vector, FD beam) represent the selected frequency domain basis. Each DFT vector uses N3 FD basis (subbands). N3 is the total number of precoding (beamforming) matrices (precoders) shown by PMI as a function of the number of subbands set within the csi-ReportingBand (number of subbands). The csi-ReportingBand represents the continuous or discontinuous subbands within a given BWP (Broadwater Stream) when CSI is reported for that BWP. M per layer v There are FD DFT vectors. If N3 > 19, then M from an intermediate subset (InS) of size N3' (< N3). v A set of FD DFT vectors (FD basis) is selected. If N3 ≤ 19, log2(C(N3-1,M v -1)) bits are reported. Here, C(N3-1,M v -1) From N3-1 items, M v - This represents the number of combinations of choosing one item (combinatorial coefficient), and is also called the binomial coefficient.

[0092] The frequency domain response / distribution (frequency response) represented by a linear combination of FD DFT vectors and LC coefficients may be called an FD beam. The FD beam may also correspond to a delay profile (time response).

[0093] The PMI subband size is given by the CQI subband size / R, where R ∈ {1, 2}. In other words, R is the ratio of the CQI subband size to the PMI subband size. The number of FD DFT vectors M for a given rank v. v is, ceil(p v It is given by ×N3 / R). The number of FD DFT vectors M vThis is the same for all layers l ∈ {1, 2, 3, 4}. v This is set by the higher layer.

[0094] The multiple precoding matrices shown by PMI are L+M v It is determined by the number of vectors.

[0095] For beam indices i=0,1,...,L-1, L SD beams (SD DFT vectors) vm_1^(i),m_2^(i) are identified by q1, q2, n1, n2, i 1,1 i 1,2 This is shown by.

[0096] M v The number of FD DFT vectors is M initial ∈{-2M v +1,-2M v +2,...,0}, n 3,l =[n 3,l (0) ,...,n 3,l (M_v-1) ], n 3,l (f) It is identified by ∈{0,1,...,N3-1}.

[0097] In the FD DFT vector, the elements (FD basis) for the indices t=0,1,...,N3-1 and layers l=1,...,v of the FD basis (subband) are y t,l (f) =exp(j2πtn 3,l (f) / N3) is the M of the FD DFT vector. v The number of indices f = 0, 1, ..., M v M for -1 v The individual FD DFT vectors are, [y 0,l (f) ,y 1,l (f) ,...,y N_3-1,l (f) ] T That is the case.

[0098] W 2,lEach row represents the channel frequency response of a specific SD beam. When an SD beam has high directivity, the channel taps per beam are limited (the power delay profile is sparse in the time domain). As a result, the channel frequency responses of each SD beam are highly correlated (approaching flatness in the frequency domain). In this case, the channel frequency response can be approximated by a linear combination of a small number of FD DFT vectors. For example, M v If = 2, then the FD DFT vectors f2, f q and LC coefficient d1 0 d2 0 Using this, the frequency response associated with the SD beam b0 is d1 0 f2+,d2 0 f q It is approximated by this.

[0099] Dominant M v The number of FD DFT vectors is selected. v By making it N3, W ~ l The overhead is W 2,l It's considerably smaller than the overhead of M. v All or part of the FD DFT vectors are used to approximate the frequency response of each SD beam. A bitmap is used to report only the FD DFT vectors selected for each SD beam. If no bitmap is reported, all FD DFT vectors are selected for each SD beam. In this case, the NZC of all FD DFT vectors is reported for each SD beam. The number of NZCs in one layer is K. l NZ ≤K0=ceil(β×2LM) v ) and the NZC number K spans all layers. NZ ≤2K0 = ceil(β × 2LM) v ) β is set by the higher layer.

[0100] In the Extended Type 2 Codebook, L, β, p vThe combination of values ​​(parameter combination) is determined by the higher-layer parameter paramCombination-r16 (parameter combination setting). L is the number of SD beams. v M is the number of FD basis vectors for rank v. v =ceil(p v This is a parameter for calculating ×N3 / R). β is a parameter for calculating the maximum number of NZCs.

[0101] In this disclosure, the terms "codebook parameter combination," "codebook parameter combination," "parameter combination," and "parameter combination setting" may be interpreted interchangeably.

[0102] The Type 2 CSI feedback on PUSCH in Rel. 16 consists of two parts. CSI Part 1 has a fixed payload size and is used to identify the number of information bits in CSI Part 2. The size of Part 2 is variable (the UCI size depends on the number of NZCs, which is unknown to the base station). The UE reports the number of NZCs in CSI Part 1, and this number determines the size of CSI Part 2. After receiving CSI Part 1, the base station recognizes the size of CSI Part 2.

[0103] In the Extended Type 2 CSI Feedback of Rel. 16, CSI Part 1 includes (if reported) the RI, the CQI, and an indicator of the total number of non-zero amplitude coefficients across multiple layers for the Extended Type 2 CSI. The fields of Part 1, (if reported) the RI, the CQI, and the indicator of the total number of non-zero amplitude coefficients across multiple layers, are encoded separately. CSI Part 2 includes the PMI for the Extended Type 2 CSI. Parts 1 and 2 are encoded separately. CSI Part 2 (PMI) includes the oversampling factor, the index of the SD basis corresponding to each SD beam, and the index M of the initial FD DFT vector (start offset) of the selected DFT window. initialIt includes at least one of the following: a selected FD basis for each layer, NZC (amplitude and phase) for each layer, a strongest coefficient indicator (SCI) for each layer, and the amplitude of the strongest coefficient for each layer / polarization.

[0104] Multiple PMI indices (PMI values, codebook indices) associated with different CSI Part 2 information are represented by the following equation F21 for the l-th layer of rank v: i1 = [i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 ] (v=1) i1=[i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 i 1,6,2 i 1,7,2 i 1,8,2 ] (v=2) i1=[i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 i 1,6,2 i 1,7,2 i 1,8,2 i 1,6,3 i 1,7,3 i 1,8,3 ] (v=3) i1=[i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 i 1,6,2 i 1,7,2 i 1,8,2 i 1,6,3 i 1,7,3 i 1,8,3 i 1,6,4 i 1,7,4 i 1,8,4 ] (v=4) (F21)

[0105] Each index is defined as follows: ◆i 1,1 : Rotation factors [q1 q2] in two-dimensional oversampling. q1 ∈ {0, 1, ..., O1-1}, q2 ∈ {0, 1, ..., O2-1}. A beam index is selected within each (SD) beam group, i 1,1 Reported / displayed by ◆i 1,2 : Multiple SD base indices corresponding to each SD beam. 1,2 ∈{0,1,...,C(N1N2,L)-1}. From N1N2 (SD) beam groups, L beam groups are selected, i 1,2 Reported / displayed by ◆i 1,5 : Codebook indicator. The index of the FD base for the selected DFT window. i 1,5 ∈{0,1,...,2M v -1}. ◆i 1,6,l : Codebook indicator. The FD basis selected for the l-th layer. If N3 ≤ 19, i 1,6,l ∈{0,1,...,C(N3-1,M v -1)-1}. If N3 > 19, i 1,6,l ∈{0,1,...,C(2M v -1,M v -1)-1}. ◆i 1,7,l : A bitmap indicator for the l-th layer. The non-zero bits in that bitmap are i 2,4,l and i 2,5,l Identify which coefficients within it will be reported. 1,7,l =[k l,0 (3) ... k l,M_v-1 (3) ], k l,f (3) =[k l,0,f (3) ... k l,M_v-1,f (3) ], k l,i,f (3) ∈{0,1}. ◆i 1,8,l : Strongest coefficient indicator for the l-th layer (maximum element k in the amplitude coefficient indicator) l,i,f (2) ). i1,8,l The strongest coefficients of layer l, identified by ∈{0,1,...,2L-1}, are i for v=1. 1,8,l =Σ i=0 i_1^* k l,i,0 (3) Given -1, for 1 < v ≤ 4, i 1,8,l =i l * It is given as follows: ◆i 2,3,l : Amplitude coefficient indicator (for both polarizations) of the coefficient (wideband) of the l-th layer. 2,3,l =[k l,0 (1) k l,1 (1) ]. ◆i 2,4,l : Amplitude coefficient indicator of the reported (subband) coefficients of the l-th layer. 2,4,l =[k l,0 (2) ... k l,M_v-1 (2) ]. ◆i 2,5,l : Phase coefficient indicator of the reported (subband) coefficients of the l-th layer. 2,5,l =[c l,0,f ... c l,M_v-1,f ].

[0106] f l * ∈{0,1,...,M v -1}, i 2,4,l Let i be the index. l * k ∈{0,1,...,2L-1} l,f_l^* (2) Let this be the index of f. l * and i l * This is the strongest coefficient for layers l=1,...,v, i, i for layer l. 2,4,l elements kl, i_l^*, f_l^* (2) Identification. Codebook index n 3,l is n 3,l (f_l^*) Regarding n 3,l (f) =(n 3,l (f)-n 3,l (f_l^*) ) is remapped to mod N3, and after remapping, n 3,l (f_l^*) = 0. The index f is f l * Regarding f=(ff l * ) mod M v It is remapped as and after remapping f l * =0 (l=1,...,v). 2,4,l i 2,5,l , and i 1,7,l The following shows the amplitude coefficient, phase coefficient, and bitmap after remapping.

[0107] W ~ l Each LC coefficient (complex coefficient) reported within is the amplitude and phase, quantized separately. ◆ Amplitude quantization polarization eigenreference amplitude is defined in the table (amplitude coefficient indicator i) in the specification. 2,3,l Mapping of elements within: Amplitude coefficient indicator element k l,p (1) from the amplitude coefficient p l,p (1) This is a 16-level quantization using mapping to p l (1) =[p l,0 (1) p l,1 (1) ] is [k l,0 (1) k l,1 (1) ], k l,p (1) It is quantized to ∈{0,...,15}. All other coefficients are defined in the table (amplitude coefficient indicator i) in the specification. 2,4,l Mapping of elements within: Amplitude coefficient indicator element k l,i,f (2) from the amplitude coefficient p l,i,f (2) This is an 8-level quantization using mapping to p l (2) =[p l,0 (2) ... pl,M_v-1 (2) ], p l,f (2) =[p l,0,f (2) ... p l,2L-1.f (2) ] is k l,f (2) =[k l,0,f (2) ... k l,2L-1.f (2) ], k l,i,f (2) It is quantized to ∈{0,...,7}. ◆Phase quantization amplitude coefficient indicator i 2,5,l Internal elements (amplitude coefficient indicator elements) [c l,0 ... c l,M_v-1 ] is reported by UE (using 4 bits). All phase coefficients are quantized using 16-PSK. Quantity φ for phase difference l,i,f = exp(j2πc l,i,f The phase coefficient in / 16) is c l,f =[c l,0,f ... c l,2L-1.f ], c l,i,fi It is quantized to ∈{0,...,15}.

[0108] The amplitude coefficient indicator element kl,floor(i_l^* / L) corresponds to the strongest coefficient of layer l. (1) =15 (maximum value), and the amplitude coefficient indicator element k l,i_l^*,0 (2) =7 (maximum value), and the phase coefficient indicator element c l,i_l^*,0 (2) =0 (minimum value). For l=1,...,v, kl,floor(i_l^* / L) (1) , k l,i_l^*,0 (2) , c l,i_l^*,0 (2) =0 is not reported.

[0109] i 1,5 and i 1,6,l This is the PMI index for reporting based on FD. Only when N3 > 19, i 1,5 It is reported.

[0110] 3000 to 2999+PCSI-RS The precoding matrix W represented by the codebook for v (=1 to 4) layer CSI reporting using (v) This is the precoding matrix W for layer l (=1 to v). l Based on the precoding matrix W. l This is expressed by the following equation F3.

[0111] Here, the beam indices i = 0, 1, ..., L-1, m1 (i) =O1n1 (i) +q1, m2 (i) =O2n2 (i) +q2, n1 (i) ∈{0,1,...,N1-1}, n2 (i) ∈{0,1,...,N2-1}. (i) n2 (i) This is the SD basis for representing the SD beam i. vm_1^(i) and m_2^(i) are the DFT vectors representing the SD beam. l,0 (1) This indicates the wideband amplitude coefficient. l,i,f (2) This indicates the subband amplitude coefficient. φ l,i,f This indicates the phase coefficient. Thus, the codebook for each layer includes the strongest coefficient for each polarization, the amplitude coefficient for each polarization, each FD beam, and each SD beam, and the phase coefficient for each polarization, each FD beam, and each SD beam.

[0112] In 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 are performed.

[0113] In extended type 2 reporting and predictive PMI type 2 reporting, where N4=1 is set, for a given CSI report n, the index i is numbered by l, i, and f. 2,4,l i 2,5,l , and i 1,7,l The reported elements are l=1,2,...v, i=0,1,...,2L-1, and f=0,1,...,M vUsing -1, π(f) = min(2・n 3,l (f) ,2・(N3-n 3,l (f) Using (-1), the priority value Pri(l,i,f) = 2・L・v・π(f) + v・f + l. The element with the highest priority has the lowest association value Pri(l,i,f). Part 2 CSI omissions are for priority reporting levels (priority reporting table, priority 0, 1, ..., 2N). rep , N rep This follows the number of CSI reports set to be transported on PUCH. Groups 0 and 2 are based on the following: ◆ Group 0 is i 1,1 And, i 1,2 And, i 1,8,l (l=1,...,v) and (if reported) a second wideband CQI (TB). ◆Group 1 is i 1,5 And, i 1,6,l And, i 1,7,l v2LM with the highest priority (highest priority) v Q-floor(K NZ / 2) elements and i 2,3,l And, i 2,4,l From the highest priority among them (higher priority), max(0,ceil(K NZ (2)-v) elements, and i 2,5,l From the highest priority among them (higher priority), max(0,ceil(K NZ (2)-v) elements and (if reported) i 1,10,l and (if reported) the second subband CQI (of the TB) of the even-indexed subbands. ◆Group 2 is i 1,7,l From the lowest priority (lowest priority) among them, floor(K NZ / 2) elements and i 2,4,l min(K) from the lowest priority (lowest priority) NZ -v,floor(K NZ / 2)) elements and i 2,5,l min(K) from the lowest priority (lowest priority) NZ -v,floor(K NZIt includes (2)) elements and (if reported) the second (TB) subband CQI of the odd-indexed subband.

[0114] In the priority reporting table, priorities are 0, 1, ..., 2N. rep This is based on the following: ◆Priority 0 corresponds to CSI reports 1 to N rep This is Group 0 CSI up to [date]. ◆Priority 1 is Group 1 CSI in CSI Report 1. ◆Priority 2 is Group 2 CSI in CSI Report 1. ◆Priority 3 is Group 1 CSI in CSI Report 2. ◆Priority 4 is Group 2 CSI in CSI Report 2. ... ◆Priority 2N rep -1 is CSI Report N rep This is Group 1 CSI. ◆Priority 2N rep This is CSI Report N rep This is Group 2CSI.

[0115] In Type 1 CSI, the SD beam, represented using the SD DFT vector, is sent towards the UE. In Type 2 CSI, L SD beams are linearly combined and sent towards the UE. Each SD beam can be associated with multiple FD DFT vectors (FD beam, FD basis, frequency response). For the corresponding SD beams, the channel frequency response can be obtained by the linear combination of these FD DFT vectors. The channel frequency response corresponds to the power delay profile.

[0116] (Type 2 Port Selection Codebook) For Type 2 port selection (PS) CSI (Type 2 PS Codebook) Rel. 15, the UE sets the upper layer parameter codebookType to 'typeII-PortSelection'.

[0117] In Rel. 15 Type 2 Port Selection CSI, the UE does not need to derive the SD beam by considering the SD DFT vector as in Type 2 CSI. The base station transmits CSI-RS using K beamformed CSI-RS ports considering the set of SD beams. The UE selects / identifies the best L (≤K) CSI-RS ports for each polarization and reports their indices in W1. Rel. 15 Type 2 PS CSI supports ranks 1 and 2.

[0118] The value of d is set using the higher-level parameter portSelectionSamplingSize. d ∈ {1, 2, 3, 4} and d ≤ min (P CSI-RS ( / 2,L)

[0119] L antenna ports for each polarization i 1,1 Selected by i 1,1 ∈ {0, 1, ..., ceil (P CSI-RS The formula is (2d) - 1.

[0120] ((Enhanced Type 2 Port Selection Codebook (Rel. 16))) For Type 2PS CSI (Enhanced Type 2PS Codebook) Rel. 16, the UE sets the upper layer parameter codebookType to 'typeII-PortSelection-r16'.

[0121] The operation of the Rel. 16 Type 2 PS CSI is the same as the Rel. 16 Type 2 CSI, except for the SD beam selection. The Rel. 15 Type 2 PS CSI supports ranks 1 through 4.

[0122] For a layer l ∈ {1, 2, 3, 4}, a precoding matrix W is used for generating subband-wise precoders. l This is expressed by the following equation F4: W l (N t ×N3) = QW1W ~ l W f,l H(F4)

[0123] Here, Q(N t ×K) represents the K SD beams used in CSI-RS beamforming. W1(K×2L) is a block diagonal matrix. ~ l (2L×M) is the LC coefficient matrix. f,l (N3×M) is a matrix consisting of M vectors (FD basis vectors), where each vector contains N3 FD basis vectors. K is set by the upper layer. L is set by the upper layer. P CSI-RS ∈{4,8,12,16,24,32}. P CSI-RS If >4, then L∈{2,3,4}.

[0124] In Rel. 15 / 16 Type 2PS CSI, each CSI-RS port #i is connected to SD beam b i It is associated with.

[0125] The extended type 2PS CSI is similar to the type 2 CSI of Rel. 16 in that it changes the number of FD basis vectors from N3 to M. v By reducing to (M v Compared to the Type 2PS CSI of (N3), Rel. 15, overhead is reduced.

[0126] In the expanded type 2PS codebook, L, β, p v The combination of values ​​(parameter combination) is determined by the higher-level parameter paramCombination-r16 (parameter combination setting).

[0127] ((Additional Enhanced Type 2 Port Selection Codebook (Rel. 17))) For the Rel. 17 Type 2PS CSI / codebook (further enhanced Type 2PS codebook), the UE sets the upper layer parameter codebookType to 'typeII-PortSelection-r17'.

[0128] In Rel. 17 Type 2PS CSI, each CSI-RS port #i uses an SD-FD beam pair (SD beam b) instead of an SD beam. i and FD beam f i,j It is associated with a pair (where j is the frequency index). In this example, ports 3 and 4 are associated with the same SD beam and different FD beams.

[0129] The frequency selectivity of the channel frequency response observed in UE based on an SD beam-FD beam pair can be reduced compared to the frequency selectivity of the channel frequency response observed in UE based on an SD beam by delay pre-compensation.

[0130] The main scenario in Rel. 17 Type 2PS Codebook is FDD. Channel reciprocity based on SRS measurements is not perfect (the angles of the UL and DL beams may differ, the UL and DL frequencies may differ in FDD, and the effective antenna spacing differs at those UL and DL frequencies). However, the base station can obtain / select some partial information (dominant angles and delays (SD beam and FD beam)). By using SRS measurements at the base station in addition to CSI reporting, the base station can obtain CSI for determining the DL MIMO precoder. In this case, some CSI reporting may be omitted to reduce CSI overhead.

[0131] In the additional extension type 2PS codebook, the values ​​of α, M, and β (codebook parameter combinations, parameter combinations) are determined by the higher-layer parameter paramCombination-r17 (codebook parameter setting). In the parameter combinations α, M, and β for the additional extension type 2PS codebook of Rel. 17, α is the number of selected CSI-RS ports in the PS codebook K1 = αP CSI-RSThese are the parameters for the calculation of . M is the number of FD basis vectors. β is the parameter for calculating the maximum number of NZCs. The precoding matrix shown by PMI is determined from L+M vectors, where L=K1 / 2 and K1=αP CSI-RS That is the case.

[0132] L vectors v m^(i) Based on (i=0,1,...,L-1), P CSI-RS K1 ports are selected from the available ports. Vector v m^(i) m=[m (0) ... [m (L-1) ], m (i) ∈{0,1,...,P CSI-RS Identified by / 2-1} m (i) is index i 1,2 ∈{0,1,...,C(P CSI-RS Reported / displayed by / 2,L)-1}

[0133] In the Rel. 17 additional extension type 2PS CSI, each CSI-RS port is beamformed using an SD beam and an FD beam. Each port is associated with an SD-FD beam pair.

[0134] Precoding matrix W for a given layer l l This is expressed by the following equation F5: W l (K × N³) = W¹W ~ l W f,l H (F5)

[0135] For W1 (K×2L), each matrix block consists of L columns of a K×K identity matrix. The base station transmits K beamformed CSI-RS ports. Each port is associated with an SD-FD beam pair. The UE selects L ports out of the K and reports an index indicating the selected ports to the base station as part of the PMI. In Rel. 16, each port is associated with an SD beam.

[0136] W ~ l (2L x M) v The matrix consists of coupling coefficients (subband complex LC coefficients). Up to K0 NZCs are reported. The report consists of two parts: a bitmap showing the NZC locations and the quantized NZCs.

[0137] In Rel. 17 additional expansion type 2PS CSI, K l NZ =Σ i=0 k1-1 Σ f=0 M-1 k l,i,f (3) ≤K0 is the number of non-zero coefficients in layers l=1,...,v, and K NZ =Σ l=1 v K l NZ ≤ 2K0 is the total number of non-zero coefficients. If v ≤ 2 and K NZ If =K1Mv, then i for layers l=1,...,v 1,7,l The bitmap indicator for the l-th layer is not reported. In other words, if the total number of reported NZCs is equal to the maximum number of K1Mv and v ≤ 2, the reporting of the bitmap indicating the location of the NZCs is omitted. Note that in Rel. 16, the bitmap of the NZC location is always reported.

[0138] W f,l (N3×M v ) is M per layer v (M v It is a matrix consisting of 1 or 2 FD basis vectors. Each vector contains N3 FD basis vectors (FD-DFT basis vectors). The base station is W f,l You may delete it. M v If = 1, W f,l It is off, and no additional FD basis vectors are reported. v If = 2, W f,l It is on, M v An additional number of FD basis vectors are reported. vIf = 2, the window size N ∈ {2, 4} of the FD basis is set by the upper layer parameter (valueOfN). Note that in Rel. 16, W f,l This is always reported.

[0139] (JT) Joint transmission (JT) may mean simultaneous data transmission from multiple points (e.g., TRPs) to a single UE.

[0140] Rel. 17 supports non-coherent joint transmission (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.

[0141] In Rel. 18, support for coherent joint transmission (CJT, mTRP CJT) using up to four TRPs is being considered. 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 for channels from the four TRPs. "Coherent" may mean that there is a constant relationship between the phases of multiple received signals. Using 4TRP joint precoding, signal quality may be improved and there may be no interference between the four TRPs. The data may only be subject to interference outside the four TRPs.

[0142] (NCJT CSI / Type 1 Codebook) In Rel. 17, the scenario to which NCJT CSI reporting is applicable is a single DCI-based MTRP NCJT with a Type 1 single-panel codebook. For NCJT CSI measurement, two CMR groups can be configured within a single CSI-ReportConfig, each with a channel measurement resource (CMR) from one TRP. One CSI reporting mode can be configured from two modes.

[0143] RRC signaling enables CSI-ReportConfig for Rel. 17 non-coherent joint transmission (NCJT) CSI to configure the CMR and the CSI reporting mode (csi-ReportMode).

[0144] K s Two CMR groups with K1 + K2 CMRs are set to UE. 2 ≤ K s ≤ 8. K s Each CMR corresponds to an NZP-CSI-RS resource set for channel measurement. K1 and K2 are the number of CMRs in two CMR groups, respectively. N (N sets) of CMR pairs (resource pairs) are set up by the upper layer through selection from all possible pairs. N=1, K s =2 is supported. N max Support for =2 is an optional feature of UE. S,max Support for =X is an optional feature of the UE. Each CMR can contain up to 32 CSI-RS ports, depending on the UE's capabilities. Each CMR pair is associated with one CRI value.

[0145] The bitmap generated by RRC signaling shows the N (N=1,2) CMR pairs actually used for NCJT measurement by indicating one CMR from each CMR group. The UE measures a single TRP CSI for TRP1 and a single TRP CSI for TRP2 using the CMRs in two CMR groups, and measures the NCJT CSI using the N CMR pairs.

[0146] The UE selects one or more CSIs to report based on the mode (CSI reporting mode) set by csi-ReportMode. csi-ReportMode indicates one of two modes (NCJT CSI modes) below: ◆ Mode 1 The UE may be configured to report X CSIs associated with a single TRP measurement hypothesis and one CSI associated with an NCJT measurement hypothesis. X=0,1,2. If X=2, two CSIs are associated with two different single TRP measurement hypothesis with multiple CMRs from different multiple CMR groups. Support for X=1,2 is an optional feature of the UE for a UE that supports option 1. ◆ Mode 2 The UE is configured to report one CSI associated with the best of the NCJT and single TRP measurement hypothesis.

[0147] In Mode 1, the UE reports a total of X+1 CSIs, including X (X=0,1,2) single TRP CSIs and one NCJT CSI. In Mode 2, the UE reports one best CSI (one CSI) from all single TRP CSIs and one NCJT CSI.

[0148] Within a single CSI report, up to two single TRP CSIs and one NCJT CSI may be reported (Mode 1 with X=2). An NCJT CSI includes one CRI, two RIs (with one joint RI index), two PMIs, two LIs, and one CQI (four layers or less). A single TRP CSI is the same as an existing CSI and includes one CRI, one RI / PMI / LI, and one or two CQIs (eight layers or less, one CQI per CW).

[0149] New mapping sequences (tables) for multiple fields within a single CSI report are defined for the following cases: ◆ Mapping sequence for wideband CSI for mode 1 with X=0. Wideband CSI is supported only for mode 1 with X=0, i.e., NCJT CSI. ◆ Mapping sequence for CSI Part 1 for modes 1 and 2. ◆ Mapping sequence for CSI Part 2 wideband for modes 1 and 2. ◆ Mapping sequence for CSI Part 2 subbands for modes 1 and 2.

[0150] (CJT CSI / Type 2 Codebook) In the ideal case where 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 loss of the four paths can differ significantly. The joint precoding matrix V based on the constant module codebook is not accurate. In this case, the feedback per TRP and the coefficients between TRPs (inter-TRP) can be aligned with the current NR Type 2 codebook.

[0151] 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.

[0152] 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.

[0153] Considering the fallback operation to NCJT (i.e., single TRP), a CSI for each TRP (i.e., a single TRP CSI like the NCJT CSI in Rel. 17) is also conceivable.

[0154] 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-TRPs for FDDs, improvements to the extended (Rel. 16) Type 2 codebook and the additional extended (Rel. 17) Type 2 PS codebook are being considered.

[0155] W1 (matrix representing the SD DFT vector) for each TRP / W f The matrix (showing the FD DFT vectors) may be the same or different. W for each TRP l (NZC) may be different. W1 / W for each TRP f / W l These may be selected jointly or individually. W1 / W f / W l For the design, it is preferable to have different scenarios with different options. φ This may be reported as individual content, W lThese may be reported internally. The policies used relate to deployment scenarios (e.g., intra-site multi-TRP or inter-site multi-TRP).

[0156] For example, the precoding matrix for 4-TRP CJT CSI (codebook) is W1 / W for each TRP. f / W l It may be represented by . W1 for each TRP may be the same, different, jointly selected, or individually selected. W for each TRP l These may be different, jointly selected, or individually selected. W for each TRP f They may be the same, they may be different, they may be chosen jointly, or they may be chosen individually.

[0157] There are two codebook mode settings for FD basis selection. In mode 1, to show the FD basis offset for the j-th selected CSI-RS resource for j=2,...,N, i 1,9 A report is required. In mode 2, i 1,9 Reporting is not required. All CSI-RS resources have the same FD basis selection.

[0158] ◆Mode 1 is a basis selection of SD / FD per TRP / TRP group. It allows independent FD basis selections across N TRPs / TRP groups. For example, its codebook structure is given by the following equation G1, where N is the number of TRPs or TRP groups. [W 1,1 W ~ 2,1 W f,1 H ... W 1,N W ~ 2,N W f,N H ] T (G1)

[0159] ◆Mode 2 consists of SD basis selection per TRP / TRP group (port group or resource) and joint / common FD basis selection (spanning N TRPs / TRP groups). For example, its codebook structure is given by the following equation G2, where N is the number of TRPs or TRP groups. [W 1,1 W ~ 2,1 W f H ... W 1,N W ~ 2,N W f H ] T (G2)

[0160] In these two modes, detailed design elements such as parameter combinations, basis selection, TRP (group) selection, reference amplitude, and W2 quantization scheme may be common to all.

[0161] For the enhanced Type II codebook for CJT (Type II CSI for CJT of Rel. 18), the UE may set the higher-level parameter codebookType to 'typeII-CJT-r18'. For the further enhanced Type II port selection codebook for CJT (Type II PS CSI for CJT of Rel. 18), the UE may set the higher-level parameter codebookType to 'typeII-CJT-PortSelection-r18'.

[0162] UE is N within the resource set for channel measurement. TRP ∈{1,2,3,4} CSI-RS resources can be configured.

[0163] In the extended type 2 codebook for CJT, the upper layer parameter paramCombination-CJT-L-r18 is used to define {L1,...,L N_TRP The value of NL A set of ∈{1,2,4} combinations is established. L The value is set by the higher-level parameter numberOfSDCombinations.

[0164] In the additional extension type 2PS codebook for CJT, the upper layer parameter paramCombination-CJT-PS-alpha-r18 is used to define {α1,...,α N_TRP The value of N L A set of ∈{1,2,4} combinations is established. L The value is set by the higher-level parameter numberOfSDCombinations-PS.

[0165] The UE may have the upper layer parameter restrictedCMR-Selection set. If restrictedCMR-Selection is set, the number of CSI-RS resources to be selected N is N TRP Therefore, if not, UE is 1 ≤ N ≤ N TRP We expect to select N CSI-RS resources, and the selection is N TRP It is reported using a bitmap of bits.

[0166] In SD beam selection / reporting, the SD beam selection / reporting method for each CSI-RS resource is applied.

[0167] In the extended type 2 codebook for CJT, the precoding matrix shown by PMI is Σ j=1 N L σ_j +M v It is determined from the number of vectors. Here, {σ1,...,σ N} is 1≦σ1<…<σ N ≤N TRP This is an index of N CSI-RS resources selected in ascending order. TRP This could be the number of CSI-RS resources configured for CSI reporting, or the number of TRPs for CJT. σ_1 ,...,L σ_N} is {L1,...,L N_TRP This is the corresponding value from the selected combination of}.

[0168] j=1,...,N, i=0,1,...,L σ_j For -1, L corresponds to the j-th selected CSI-RS resource. σ_j The vectors vm_1, f^(i), m_2, f^(i) are i 1,1 i 1,2 It is displayed / reported by i. 1,1 i 1,2 This is given by the following equation G3: i 1,1 =[i 1,1,1 ... i 1,1,N ] i 1,1,j =[q 1,j q 2,j ] q 1,j ∈{0,1,...,O1-1} q 2,j ∈{0,1,...,O2-1} i 1,2 =[i 1,2,1 ... i 1,2,N ] i 1,2,j ∈{0,1,...,C(N1N2,L σ_j )-1} (G3)

[0169] In the additional extension type 2PS codebook for CJT, the precoding matrix shown by PMI is Σ j=1 N L σ_j It is determined from +M vectors. Here, {σ1,...,σ N} is 1≦σ1<…<σ N ≤N TRP This is an index of N CSI-RS resources selected in ascending order. σ_j =K 1,σ_j / 2, K 1,σ_j =α σ_j *P CSI-RS It is. {α σ_1 ,...,α σ_N} is {α1,...,α N_TRP This is the corresponding value from the selected combination of}.

[0170] j=1,...,N, i=0,1,...,L σ_j -1 vs L σ_j individual vectors v m_j^(i) Based on this, the P of the j-th selected CSI-RS resource CSI-RS From these ports, K 1,σ_j A number of ports are selected, i 1,2 It is displayed / reported by i. 1,2 This is given by the following equation G4: i 1,2 =[i 1,2,1 ... i 1,2,N ] i 1,2,j ∈{0,1,...,C(P CSI-RS ,L σ_j )-1} (G4)

[0171] In this disclosure, the following terms may be interpreted interchangeably: CJT codebook, CJT type 2 codebook, CJT extended type 2 codebook, Rel. 18 CJT type 2 codebook, codebookType='typeII-CJT-r18', CJT additional extended type 2 PS codebook, Rel. 18 CJT type 2 PS codebook, codebookType='typeII-CJT-PortSelection-r18'.

[0172] (Doppler CSI / Type 2 Codebook) It is being considered to extend / improve the capabilities of CSI reporting for fast / medium-speed moving UEs by utilizing time-domain correlation / Doppler-domain (DD) information. For example, it is being considered to improve the extended (Rel. 16) Type 2 codebook and the additional extended (Rel. 17) Type 2 PS codebook without changing the spatial domain basis and frequency domain basis, and to report time-domain channel characteristics (time-domain correlation profiles) measured via tracking RS (TRS) from the UE.

[0173] The channel coherent time (CCT) depends on the maximum Doppler shift. Channel coherent time is the time during which the measured channel characteristics are available, or the time until the measured channel characteristics become unavailable (channel aging). The maximum Doppler shift is estimated by the relative velocity between the transmitter and receiver. c is 1 / Δf max It is approximated by Δf max =v / λ. As the UE's movement speed increases, the channel coherence time decreases. For example, at a carrier frequency of 4.5 GHz, when the movement speed exceeds approximately 25 km / h, the channel coherence time falls below 10 ms. The problem then becomes how to deal with such high movement speeds and short channel coherence times.

[0174] TRS is supported to track Doppler shift. However, TRS has the following problems: ◆ The number of ports per CSI-RS resource set is limited to one. Each CSI-RS resource uses a single port. ◆ The configurable period is 10ms or longer. ◆ CSI reporting for TRS is not assumed. There is no reporting setting for P-TRS. Reporting can be set, but the report quantity can only be set to none ('none'). A maximum of 16 CSI-RS resources are used per CSI-RS resource set.

[0175] TRS (Time-Resistance Systems) are deployed in time-domain and frequency-domain resources. To measure the effects of Doppler shift, multiple time-domain RSs are required within a specific frequency-domain resource.

[0176] CMR can be used to measure the effects of Doppler shift. However, the RS used for measurement depends on the UE implementation.

[0177] Information regarding Doppler shift is not supported in the CSI report. Information for determining W=W1W2 is reported by the UE via the CSI Codebook (PMI), where W1 is the wideband characteristic and represents the spatial beam, and W2 is the subband characteristic and represents the amplitude / phase coefficient for each spatial beam.

[0178] Regarding the measurement of Doppler shift, two cases are possible: Case 1, where the UE performs the measurement based on CSI-RS, and Case 2, where the base station performs the measurement based on SRS. Regarding the determination of the effect of Doppler shift, three cases are possible: Case 1-1, where the UE makes the determination based on the CSI-RS measurement results; Case 1-2, where the base station makes the determination based on the CSI-RS measurement results reported by the UE; and Case 2-1, where the base station makes the determination based on the SRS measurement results.

[0179] CSI-RS measurement windows and CSI reporting windows are being considered. Within a CSI-RS measurement window, one or more CSI-RS occasions may be measured. The reported CSI may be associated with a CSI reporting window.

[0180] Assuming a CSI report within slot n, the length of the Doppler domain (DD) / time domain (TD) basis vector (DFT basis vector) (number of basis vectors for DD / TD) may be N4. Slot [k, k+W meas Within the CSI measurement window of -1], one or more CSI occasions for calculating the CSI report may be measured. Here, k may be a slot index, and W meas This may be the measurement window length (number of slots). CSI occasions may be set within CSI-ReportConfig. Slots [l, l+W CSI The CSI reporting window of -1] may be associated with the CSI report in slot n, where l may be the slot index, and W CSI This may be the reporting window length (number of slots). The location of the CSI reference resource is n refIt may also be expressed as follows.

[0181] CSI reporting window duration (W) CSI = dN4. d and N4 are determined by the CMR settings. The starting point of the CSI reporting window is slot l. l = (nN CSI,ref ) may also be the case. l = (n + δ) may also be the case. δ = {0, 2} may also be the case, or δ = {0, 1, 2} may also be the case.

[0182] The d slot may also represent the duration in DD units.

[0183] If UE-side prediction is assumed, the UE is supported in predicting the CSI / channel after slot l, and the base station sets the position of slot l (from multiple candidate values) via upper-layer signaling. The multiple candidates for the position of slot l are the existing CSI reference resource positions (nN CSI,ref This includes (nN) and (n+δ), where δ > 0. This includes existing CSI reference resources in existing operations, i.e., (nN CSI,ref ) will be reused / repurposed to indicate the location of the last CSI-RS occasion used in the CSI report.

[0184] An additional value of 2 is supported for the parameter δ.

[0185] N4 is set by the upper layer parameter N4 from the base station.

[0186] In N4=1, the DD basis may be identical (identity). DD compression is not required. In this case, the codebook structure may be, for example, the following equation H1: W=W1W ~ 2(W f ) H (H1)

[0187] In N4 > 1, the Doppler domain orthogonal DFT basis may be selected commonly for all SD / FD basis bases. In this case, the codebook structure may be, for example, the following equation H2: W = W1W ~ 2(W f ×W d) H (H2)

[0188] Only Q > 1, indicating the number of selected Doppler domain (DD) basis vectors, is acceptable. The detailed design of the SD / FD basis, including the associated UCI parameters, follows existing specifications.

[0189] For the enhanced Type II codebook for predicted PMI (Rel. 18 Type II CSI for predicted PMI), the UE may set the upper layer parameter codebookType to 'typeII-Doppler-r18'. For the further enhanced Type II port selection codebook for predicted PMI (Rel. 18 Type II PS CSI for predicted PMI), the UE may set the upper layer parameter codebookType to 'typeII-Doppler-PortSelection-r18'.

[0190] In this disclosure, Doppler CB, Doppler CSI, Type 2 Doppler CB, Doppler Type 2 CB, Extended Type 2 Codebook for Predictive PMI, [Rel. 18] Type 2 CSI Codebook for Predictive PMI, codebookType='typeII-Doppler-r18', Additional Extended Type 2 PS Codebook for Predictive PMI, [Rel. 18] Type 2 PS Codebook for Predictive PMI, codebookType='typeII-Doppler-PortSelection-r18' may be interpreted as one another.

[0191] (Contents of Type 1SP CB) In a codebook mode 1 with a general structure, for RI=1 to 8, one or more SD basis vectors and one or more phase adjustments are reported as follows:

[0192] ◆RI=1 ―◆One or more SD basis vectors are {beam1}. beam1 is [i1,1 ,i 1,2 It is displayed by ]. —◆Phase adjustment is {phi}.

[0193] ◆RI=2 ―◆One or more SD basis vectors are {beam1,beam2}. beam2 is represented by the offset i 1,3 It is displayed by [this]. —◆The phase adjustment is {phi,-phi}.

[0194] ◆RI=3 ―◆One or more SD basis vectors are {beam1, beam2, beam1}. beam2 is offset i 1,3 It is displayed by: ―◆Phase adjustment is {phi,phi,-phi}.

[0195] ◆RI=4 ―◆One or more SD basis vectors are {beam1,beam2,beam1,beam2}. beam2 is offset i 1,3 It is displayed by: ―◆The phase adjustment is {phi,phi,-phi,-phi}.

[0196] ◆RI=5 ―◆One or more SD basis vectors are {beam1,beam1,beam2,beam2,beam3}. beam2 / beam3 has a predefined offset from beam1. ―◆The phase adjustment is {phi,-phi,+1,-1,1}.

[0197] ◆RI=6 ―◆One or more SD basis vectors are {beam1,beam1,beam2,beam2,beam3,beam3}. beam2 / beam3 has a predefined offset from beam1. ―◆Phase adjustment is {phi,-phi,phi,-phi,+1,-1}.

[0198] ◆RI=7 ―◆One or more SD basis vectors are {beam1,beam1,beam2,beam3,beam3,beam4,beam4}. beam2 / beam3 / beam4 have a predefined offset from beam1. ―◆The phase adjustment is {phi,-phi,phi,+1,-1,+1,-1}.

[0199] ◆RI=8 ―◆One or more SD basis vectors are {beam1,beam1,beam2,beam2,beam3,beam3,beam4,beam4}. beam2 / beam3 / beam4 have a predefined offset from beam1. ―◆The phase adjustment is {phi,-phi,phi,-phi,+1,-1,+1,-1}.

[0200] phi is the inter-polarization indication φ. Phase adjustment between multiple layers is defined. In two layers using the same SD beam, a phase adjustment offset of -1 is applied to achieve inter-layer orthogonality.

[0201] Thus, the codebook index reported for the SD basis vector is, in the case of rank={2,2,4}, [i 1,1 ,i 1,2 ,i 1,3 ] and otherwise [i 1,1 ,i 1,2 The reported phase adjustment index is i2.

[0202] Figure 1 shows i in a two-layer CSI report using a Type 1SP CB. 1,3 An example of mapping from to k1 and k2 (Table T1-3) is shown. Figure 2 shows i in 3-layer and 4-layer CSI reports using Type 1SP CB. 1,3 An example of mapping from to k1 and k2 (Table T1-4) is shown. As shown in these examples, i 1,3 It is either 1 bit or 2 bits.

[0203] (Rel. 19 MIMO Consideration) Because the maximum number of CSI-RS ports, 32, is greater than the maximum number of layers, 8, the UE can measure the status of many channels and improve measurement accuracy.

[0204] Since Rel. 19, massive MIMO using more than 32 ports has been considered.

[0205] A CSI supporting up to 128 CSI-RS ports is being considered, targeting FR1. Specifically, the following items are being considered: ◆ Item 2a: An improvement to the Type 1 codebook that supports up to 128 CSI-RS ports in total across all resources, based on an extension of the existing codebook and assuming existing CSI-RS resources (with up to 32 CSI-RS ports per resource). ◆ Item 2b: An improvement to the Type 2 codebook that supports up to 128 CSI-RS ports in total across all resources, based on an extension of the existing codebook and assuming existing CSI-RS resources (with up to 32 CSI-RS ports per resource), without changing any codebook parameters other than introducing an additional value for the codebook parameter for the number of ports. ◆Item 2c: Extension of CRI-based CSI reporting (reporting of CQI / PMI / RI calculated for each CRI for one or more CRIs) for hybrid beamforming that supports up to 128 CSI-RS ports in total across all resources, using up to 32 CSI-RS ports per resource, without requiring a new codebook design. ◆Item 2d: For 6 / 8Rx low complexity receivers supporting more than four layers, SRS port grouping and association of SRS port groupings to two codewords are being considered using existing codebooks. The 6 / 8Rx low complexity receiver may use six or eight Rx antennas. Extensions to the mapping from codewords to layers, DL resource placement, CSI feedback, and DCI format are not required.

[0206] <Rel. 19 Type 1SP CB> In Rel. 19 Type 1SP CB, the following two schemes are supported.

[0207] ◆Rel. 19 Type 1SP CB Scheme A (Economical). This CB uses the following principles, W1 and W2. —◆Principle Rel. 15 Type 1SP CB is extended to new (N1,N2) using simplification. This CB supports only Codebook Mode 1. This CB follows the general CB structure for fewer than 16 ports. —◆W1 —◆For RI≦4, W1 is almost the same as the existing Type 1SP CB and has the following structure. —◆The initial SD basis vector selection is the existing [i 1,1 ,i 1,2 ]. ---◆Other SD basis vector selections use existing offset display i that uses existing mapping between SD basis vectors and layers. 1,3 (2 bits). ---◆For RI > 4, W1 is extended based on the existing type 1SP CB and has the following structure. ---◆The first SD basis vector selection is the existing (i 1,1 ,i 1,2 ) is. ---◆Other SD basis vector selections are new displays, but are existing mappings between SD basis vectors and layers. That is, the subsequent two SD basis vectors (RI=5 to 6) or three SD basis vectors (RI=7 to 8) can be freely selected and are orthogonal in at least one dimension. ---◆W2 ---◆W2 is a single interpolarization phase adjustment report, similar to the existing Type 1SP CB, and has the following structure: ---◆Two bits from {+1,+j,-1,-j}. ---◆The phase adjustment structure for each layer follows the existing Type 1SP CB.

[0208] ◆Rel. 19 Type 1SP CB Scheme B (Advanced). This CB uses the following principles, W1 and W2. ---◆Principle This CB reuses the SD basis vectors of Rel. 16 Extended Type 2 CB to determine independent SD basis vectors for multiple layers. ---◆W1 ---◆For RI≦4, W1 has independent SD basis vectors for each layer and has the following structure. ---◆Common representation for layers (q1,q2). ---◆SD basis vector representation with ceil(log2(N1N2)) bits for each layer. ---◆For RI>4, W1 has independent SD basis vectors for every two layers and has the following structure. ---◆Common representation for layers (q1,q2). ---◆Combinatorial indication of ceil(v / 2) SD basis vectors for RI=v. The combined representation has ceil(log2(C(N1N2,ceil(v / 2)))) bits. ---◆The mapping between the SD basis vectors and two layers follows the existing type 1CB, except that when v is odd, the last vector is applied to the orphan (the remaining single layer of two layers). ---◆W2 ---◆For RI≦4, W2 is a layer-specific interpolarization phase adjustment report and has the following structure: ---◆Two bits from {+1,+j,-1,-j} for each layer. ---◆For RI>4, W2 has the following structure: ---◆Two bits from {+1,+j,-1,-j} for an isolated layer. ---◆One bit from {(1,-1),(j,-j)} to achieve interlayer orthogonality for two layers sharing the same SD basis vector.

[0209] Rel. 19 Type 1SP CB may support wideband and subband reporting. The method of displaying the SD basis vectors may be the same between wideband and subband reporting. The only difference between wideband and subband reporting may be the method of displaying the phase adjustment. In subband reporting of Scheme A, the difference in payload size between rank=1 and rank>1 may be represented only by the display of additional SD basis vectors. In subband reporting of Scheme B, the difference in payload size between rank=1 and rank>1 arises from both the layer-specific SD basis vector display and the layer-specific phase adjustment display. Therefore, in Scheme B, the payload size gap between different ranks becomes larger.

[0210] (Near-field (NF)) The radiation field of an antenna array can be divided into a far-field (FF) and a near-field (NF). When the length of the array is L and the wavelength of the carrier is λ, the boundary between NF and FF (distance from the array), as in the example in Figure 3, is L 2 It is proportional to / λ. In FF, the wavefront is approximately planar, and the array response depends only on the angle. In NF, the wavefront is considered spherical, and the array response depends on both the angle and the distance.

[0211] For use in NF (Non-Functional) systems, a ring-type codebook is being considered. This codebook takes into account the distance and direction of the UE (Union Emission) from the center of the radiation array, enabling dynamic beam focusing for UEs within the NF region. This codebook separates angle-dependent and distance-dependent terms.

[0212] (Spherical wave vectors) In DFT vectors, the basis vectors are defined by angles in the N1,N2 domains (N1,N2 dimensions), as defined in the NR specification. In spherical wave vectors, in addition to angles, distance in the N3 domain (N3 dimensions) is also considered for the basis vectors.

[0213] Precoders in ring-type codebooks are, for example, distance-dependent precoders / matrices (e.g., W Ring ) and angle-dependent precoders / matrices (e.g., W DFT It may also be calculated by the product of (for example, the Hadamard product, e.g., element-wise product) ). In this example, the precoder may be calculated by the following equation 1.

[0214] Here, X n This could be the distance from the center of the array to element n within the array, or D F k may be the axial distance between the array and the focal position, and k may be an index corresponding to the phase in the DFT.

[0215] Figure 4 shows an example of a precoder in a ring-type codebook. Figure 4 shows an example of a uniform and linear array. In the example shown in Figure 4, beam focusing is first performed at the boresight. The distance-dependent precoder described above may be used for this beam focusing. Next, the focal position is shifted using the DFT vector. The angle-dependent precoder described above may be used for this shifting.

[0216] In other examples, the precoder may be calculated using the following equation 2.

[0217] In the angular domain, cosθ may be uniformly quantized. The uniform quantization of cosθ may be given by cosθ = 2l / N1O1-1, where l is the index in the angular domain, and l may be 0, 1, ..., N1O1-1.

[0218] In the distance domain, 1 / r may be uniformly quantized. The uniform quantization of 1 / r is given by 1 / r = (o / N3O3-1)(1 / r min -1 / r max ) + 1 / r maxIt may also be given by the following: Here, o is the index in the distance domain, and o = 0, 1, ..., N3O3-1.

[0219] (Unified / Scalable Codebook) In 6G, to support various use cases (e.g., single-user (SU) / multi-user (MU), single-TRP / multi-TRP, NF / FF, frequency range (e.g., FR1 / FR2), duplex scheme (e.g., TDD / FDD)) and codebook types (e.g., Type 1, Type 2, Extended Type 2, port selection, Doppler CSI), it is being considered to define a unified codebook framework or a scalable codebook.

[0220] One way to define such a unified / scalable codebook is through a downloadable / configurable codebook. In MIMO channels between the BS and UE, there is channel state information (CSI) that can be long-term information, especially in the case of non-high mobility. This long-term information can be measured / acquired by the BS (e.g., based on UL SRS or other implementation algorithms including AI-based methods) and set directly in the UE, thereby reducing the load on the UE to measure / calculate long-term information. The UE can then measure other short-term information. In this way, the overhead of CSI reporting is also reduced because the long-term information does not need to be reported by the UE.

[0221] This disclosure describes a unified, downloadable / configurable codebook.

[0222] (Analysis / Issues) Existing NR codebook types are based on DFT beams / vectors. Various codebook types consider the following codebook structures: ◆W1: Spatial domain (SD) vectors. One or more vectors for a single layer, and one or more identical or different vectors for each layer. ◆W2 or Wf : Frequency / subband domain (FD) or delay domain. ◆W d : Doppler domain (DD) or time domain (TD). ◆W coeff : Coefficients for each domain and each vector, or coefficients for combinations of vectors from the different domains mentioned above. -W coeff This may include amplitude / co-phasing information. -W coeff The wideband coefficient (W coeff_wb ) and subband coefficient (W coeff_sb ) may also be divided into these parts.

[0223] For larger antenna arrays and higher frequencies, the effectiveness of near-field (NF) testing may be considered, and NF codebooks may be based on DFT vectors or spherical waves.

[0224] In the case of NF based on DFT vectors, existing NR codebook structures like the one described above may be reused [generally] by changing the method of setting / selecting SD vectors.

[0225] In the case of NF based on spherical waves, the above SD vector W1 may be based not only on the antenna (N1,N2) but also on the spherical wave vector related to the distance N3 between the UE and BS.

[0226] In the above codebook, W1 may be considered [generally] as long-term information (long-term CSI). As mentioned above, such long-term information may be set by the UE to reduce the load on the UE to measure / calculate W1, and the UE may set other [short-term] information (e.g., W2 / W). d / W coeff ) may be measured and reported. Also, in certain cases, in addition to W1, the FD / DD / TD vectors may be considered long-term information and set to UE.

[0227] The above codebooks are still based on predefined SD basis vectors (e.g., DFT vectors related to N1,N2, or spherical wave vectors related to N1,N2,N3). However, in AI-advanced 6G, for example, the predicted SD basis vectors for a UE or cell may be non-predefined vectors, or even arbitrary vectors. Thus, how to incorporate AI-predicted codebooks (downloaded codebooks) into the configurable codebook framework described above in future wireless communication systems has not been sufficiently considered.

[0228] If the codebook framework for future wireless communication systems is not adequately considered, there is a risk that communication quality and throughput may deteriorate.

[0229] Therefore, the inventors conceived of a unified, downloadable / configurable codebook for future wireless communication systems.

[0230] The embodiments relating to this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination. This disclosure also provides embodiments in which some / all of one embodiment is combined with some / all of another embodiment.

[0231] (Various substitutions) In this disclosure, words enclosed in parentheses () may indicate an explanation of the preceding word (e.g., an explanation of spelling), a paraphrase, a specific example, or supplementary explanation. Also, in this disclosure, words enclosed in square brackets ([]) may be interpreted as part of the overall meaning of the text, or they may be interpreted as being excluded (ignored). Note that parentheses () and square brackets ([]) may be used for purposes / meanings other than those described above.

[0232] 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".

[0233] In this disclosure, terms such as notice, activate, deactivate, indicate (or specify), select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and capable of operating may be interpreted interchangeably.

[0234] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, fields, Information Elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Elements (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0235] In this disclosure, terms such as signaling, message, field, parameter, information, and payload may be interpreted interchangeably.

[0236] In this disclosure, the upper-layer signaling may be any or a combination thereof, such as Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, Non-Access Stratum (NAS) signaling [of the control plane], and other messages (e.g., messages communicated with the core network, such as positioning protocol (e.g., NR Positioning Protocol A (NRPPPa) / LTE Positioning Protocol (LPP)) messages).

[0237] 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).

[0238] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0239] In this disclosure, ceil(x), the ceiling function, and the ceiling function may be interpreted as interchangeable. In this disclosure, floor(x), the floor function, and the floor function may be interpreted as interchangeable. In this disclosure, ceil(x) and floor(x) may be interpreted as interchangeable. In this disclosure, sqrt(x), the square root of x, and the root x may be interpreted as interchangeable. In this disclosure, x mod y, mod(x, y), the mod function, and the modulo operation may be interpreted as interchangeable. In this disclosure, Σ i=M M+N-1 f(i), Σ i=M M+N-1 f i f(i) or f over i = M, M+1, ..., M+N-1 i The sum of f(M) + f(M+1) + ... + f(M+N-1), f M +f M+1 +...+f M+N-1, can be read interchangeably. C(n,k) is the number of combinations of choosing k values ​​from n values ​​(combinatorial coefficient), binomial coefficients, n C k , C n k , may be interpreted as mutually exclusive. In this disclosure, x / / y and floor(x / y) may be interpreted as mutually exclusive.

[0240] In this disclosure, A b The notations A_b, Ab, and A with a b placed to the lower right may be interpreted as interchangeable. In this disclosure, A c The notation A^c, with a c superscripted above A, may be interpreted as interchangeable. In this disclosure, A b c The notation A_b^c, where b is placed to the lower right of A and c is placed to the upper right of A, may be interpreted as being interchangeable. In this disclosure, x ~ x may be represented by placing a ~ above x, or it may be called x tilde. In this disclosure, x - x may be represented by placing a hyphen above it, or it may be called an x-bar. In this disclosure, x ＾ This can also be represented by placing a caret (^) above x, or it may be called an x-hat.

[0241] In this disclosure, Long-term information, Long-term CSI, Codebooks set by the NW, Codebooks not measured / calculated / reported by the UE, and [unified] downloadable / configurable codebooks may be interpreted as interchangeable.

[0242] In this disclosure, Short-Term Information, Short-Term CSI, Codebooks measured / calculated / reported by UE, and other [Domain] Information may be interpreted as mutually exclusive.

[0243] In this disclosure, CSI, codebook [structure] [information], vector [pair / combination], [precoding] matrix, precoder, coefficient [matrix], and weight [matrix] may be interpreted as each other.

[0244] In this disclosure, the codebook set by NW may be specific to a cell [group] or specific to a UE [group].

[0245] In this disclosure, the terms SD and FD / DD one or more vectors, one or more SD vectors and one or more FD vectors, one or more pairs of SD vectors and FD vectors, one or more combinations of SD vectors, FD vectors and DD vectors, one or more pairs / combinations of SD vectors and FD / DD vectors, one or more SD-FD [vectors] [pairs], one or more SD-FD-DD [vectors] [combinations], one or more SD-FD / -DD [vectors] [pairs / combinations], one or more SD / FD / DD [vectors] [pairs / combinations], and one or more vector pairs / combinations may be interpreted as one another.

[0246] (Wireless Communication Method) Each embodiment of the present disclosure assumes that one or more vectors of SD and FD / DD are set by the NW as information / codebook, and other domain information is measured / calculated / reported by the UE, but the application of each embodiment of the present disclosure is not limited thereto.

[0247] The relevant settings parameters in each embodiment of this disclosure may be reset / updated / instructed by RRC / MAC CE / DCI.

[0248] <First Embodiment> This embodiment relates to a configurable codebook and other domain information.

[0249] With respect to the configurable codebook and other domain information, at least one of the following multiple embodiments 1-x may be applied.

[0250] <<Embodiment 1-1>> The NW has one or more SD vectors and other domain information (e.g., W2 / W f / W d / W coeffReporting settings for reporting ( / RI / CQI / LI) may be set / instructed to the UE. The UE may measure / calculate other domain information based on one or more set / instructed SD vectors. The UE may also report other domain information based on the reporting settings.

[0251] Figure 5A shows an example of a configurable codebook and other domain information according to Embodiment 1-1. As in this example, the NW may set / instruct one or more SD vectors and reporting settings for other domain information. Based on the set / instructed reporting settings, the UE will report other domain information (e.g., W2 / W f / W d / W coeff You may report ( / RI / CQI / LI).

[0252] <<<Embodiment 1-1a>>> NW includes one or more SD vectors, plus a wideband coefficient W for each SD vector. coeff_wb You may set / instruct UE to do this. coeff_wb This may include only amplitude information, or it may include both amplitude and phase adjustment information.

[0253] According to Embodiment 1-1 described above, the UE is no longer required to calculate / report the SD vector. Therefore, the load on the UE related to calculating / reporting the SD vector can be reduced.

[0254] <<Embodiment 1-2>> NW includes one or more vectors of SD and FD / DD, and other domain information (e.g., W d / W coeff Reporting settings for reporting ( / RI / CQI / LI) may be set / instructed to the UE. The UE may measure / calculate other domain information based on one or more set / instructed SD and FD / DD vectors. The UE may also report other domain information based on the reporting settings.

[0255] Figure 5B shows an example of a configurable codebook and other domain information according to Embodiment 1-2. As in this example, the NW may configure / instruct one or more SD / FD / DD vectors (or one or more SD vectors and FD / DD vectors [pairs]) and reporting [reporting settings for] other domain information. Based on the configured / instructed reporting settings, the UE will report other domain information (e.g., W d / W coeff You may report ( / RI / CQI / LI).

[0256] <<<Embodiment 1-2a>>> NW is a wideband coefficient W for each of the SD and FD / DD vectors, in addition to one or more vectors of SD and FD / DD. coeff_wb You may set / instruct UE to do this. coeff_wb This may include only amplitude information, or it may include both amplitude and phase adjustment information.

[0257] According to Embodiments 1-2 described above, the UE is no longer required to calculate / report one or more vectors of SD and FD / DD. Therefore, the load on the UE for calculating / reporting one or more vectors of SD and FD / DD can be reduced.

[0258] <<Embodiment 1-3>> The NW provides one or more SD vectors [range / candidates] for the UE to down-select, a report of one or more SD vectors selected by the UE, and other domain information (e.g., W2 / W f / W d / W coeff Reporting settings for reporting / RI / CQI / LI may be set / instructed to the UE. The UE may measure / calculate one or more selected SD vectors and other domain information based on one or more set / instructed SD vectors [range / candidates]. The UE may also report one or more selected SD vectors and other domain information from one or more set / instructed SD vectors [range / candidates] based on the reporting settings.

[0259] Figure 6A shows an example of a configurable codebook and other domain information according to Embodiment 1-3. As in this example, the NW may set / instruct the UE to set / instruct one or more SD vectors [range / candidates] for downselecting, and reporting settings [for reporting one or more selected SD vectors and other domain information]. Based on the set / instructed reporting settings, the UE will report one or more selected SD vectors and other domain information (e.g., W2 / W f / W d / W coeff You may report ( / RI / CQI / LI).

[0260] <<<Embodiment 1-3a>>> NW is one or more SD vectors [range / candidates] for UE to downselect, plus a wideband coefficient W for each SD vector coeff_wb You may set / instruct UE to do this. coeff_wb This may include only amplitude information, or it may include both amplitude and phase adjustment information.

[0261] According to the embodiments 1-3 described above, the UE no longer needs to select an SD vector from all SD bases, but only needs to select from a narrow range set by the NW. Therefore, the load on the UE for selecting an SD vector can be reduced.

[0262] <<Embodiment 1-4>> NW provides a range / candidates for one or more SD and FD / DD vectors for UE to downselect, a report of one or more SD and FD / DD vectors selected by UE, and other domain information (e.g., W d / W coeff Reporting settings for reporting ( / RI / CQI / LI) may be set / instructed to the UE. The UE may measure / calculate one or more selected SD and FD / DD vectors and other domain information based on one or more vectors [range / candidates] of the set / instructed SD and FD / DD. The UE may also report one or more selected SD and FD / DD vectors and other domain information from one or more vectors [range / candidates] of the set / instructed SD and FD / DD based on the reporting settings.

[0263] Figure 6B shows an example of a configurable codebook and other domain information according to Embodiment 1-4. As in this example, the NW may set / instruct the UE to set / instruct one or more vectors [range / candidates] of SD and FD / DD for downselection, and to set / instruct the reporting settings [for reporting] of the selected SD and FD / DD vectors and other domain information. Based on the set / instructed reporting settings, the UE will report the selected SD and FD / DD vectors and other domain information (e.g., W d / W coeff You may report ( / RI / CQI / LI).

[0264] <<<Embodiment 1-4a>>> NW includes one or more SD and FD / DD vectors [range / candidates] for UE to downselect, in addition to a wideband coefficient W for each SD / FD / DD vector (or pair of SD and FD / DD vectors) coeff_wb You may set / instruct UE to do this. coeff_wb This may include only amplitude information, or it may include both amplitude and phase adjustment information.

[0265] According to Embodiments 1-4 described above, the UE is no longer required to select one or more SD and FD / DD vectors from all SD / FD / DD bases, and can select from a narrow range set by the NW. Therefore, the load on the UE for selecting one or more SD and FD / DD vectors can be reduced.

[0266] <Second Embodiment> This embodiment relates to the definition of a configurable codebook. This embodiment may be applied to the configurable codebook in the first embodiment.

[0267] Regarding the definition of configurable codebooks, at least one of the following options x may apply.

[0268] ◆Option 1: For configurable codebooks, a full set of SD / FD / DD vectors may be predefined in the specification. At least one (subset) of the predefined full set may be configured / instructed by the NW via RRC / DCI / MAC CE / SIB, or reported by the UE as UE capability. At least one of the following options 1-x may be applied to the full set.

[0269] - ◆Option 1-1 The full set may include one or more DFT vectors.

[0270] Figure 7A shows an example of one or more DFT vectors included in the full set according to option 1-1 of the second embodiment. As in this example, each DFT vector included in the full set may be a vector defined by an angle in N1,N2 dimensions.

[0271] - ◆Option 1-2 The full set may include one or more spherical wave vectors.

[0272] Figure 7B shows an example of one or more spherical wave vectors included in the full set according to option 1-2 of the second embodiment. As in this example, each spherical wave vector included in the full set may be a vector defined by angles in N1 and N2 dimensions and distance in N3 dimension.

[0273] -◆Option 1-3 The full set may include one or more other vectors that are predefined [in the specification].

[0274] Figure 7C shows an example of one or more other vectors included in the full set according to options 1-3 of the second embodiment. As in this example, each vector included in the full set may be a predefined vector or it may be indexed. The full set (e.g., a table of indexes and vectors) may be predefined [in the specification], or at least one of several predefined full sets [in the specification] may be set / instructed by the network.

[0275] ◆Option 2: Regarding configurable codebooks, the full set of SD / FD / DD vectors may not be predefined in the specification and may be downloadable by the NW from other functions (NF, e.g., AI agent). The full set downloaded by the NW may be set in the UE by the NW. The full set may also be set in the UE using PDSCH. In this case, the full set (e.g., one or more SD vectors) is treated as data from the perspective of RRC / MAC / PHY and is therefore transparent to the NW's RRC / MAC / PHY layer.

[0276] For the full set of SD / FD / DD vectors described above, each vector may be indexed. At least one (a subset) of the full set may be set / indicated based on the index. The indexing rule may be at least one of the following options x:

[0277] ◆Option A The indexing rules may be predefined in the specification. The indexing rules may be at least one of the following options A-x.

[0278] - Option A-1 Structured indexing may be applied. A third embodiment of this option may be applied.

[0279] For the DFT vectors of the SD basis, two indices corresponding to the N1 and N2 dimensions may be applied. Oversampling [factor] (e.g., O1 / O2) may or may not be considered in the indexing. For example, the SD vector may be represented by a two-dimensional index (n1,n2) containing the N1-dimensional index n1=0,1,...,N1-1 and the N2-dimensional index n2=0,1,...,N2-1, or it may be represented by a two-dimensional index (n1,n2) containing the oversampled N1-dimensional index n1=0,1,...,N1O1-1 and the oversampled N2-dimensional index n2=0,1,...,N2O2-1.

[0280] For the DFT vector of the FD basis (or SD-FD), N subband A single index corresponding to the dimension may be applied, or N1, N2, N subband Three indices corresponding to the dimensions may be applied. In indexing, oversampling [factors] (e.g., N1 / N2 / N) may be used. subband O1 / O2 / O corresponding to each dimension subband ) may or may not be considered. For example, a pair of SD vectors and FD vectors has N1-dimensional indices n1=0,1,...,N1-1 and N2-dimensional indices n2=0,1,...,N2-1, and N subband Dimensional index n subband =0,1,…,N subband -1 and a 3D index (n1, n2, n subband It may also be represented by the oversampled N1-dimensional index n1=0,1,…,N1O1-1, the oversampled N2-dimensional index n2=0,1,…,N2O2-1, and the oversampled N subband Dimensional index n subband =0,1,…,N subband O subband -1 and a 3D index (n1, n2, n subband ) may be represented by

[0281] For the DFT vectors of the DD basis (SD-DD or SD-FD-DD), N timedomainlength A single index corresponding to the dimension may be applied, or N1, N2, N timedomainlength Three indices corresponding to the dimensions may be applied, or N1 / N2 / N subband / N timedomainlength Four indices corresponding to the dimensions may be applied. In indexing, oversampling [factors] (e.g., N1, N2, N) may be used. subband ,N timedomainlength O1 / O2 / O corresponding to each dimension subband / O timedomainlength ) may or may not be considered.

[0282] For the spherical wave vectors of the SD basis, three indices corresponding to the N1, N2, and N3 dimensions may be applied, or the N1, N2, N3 dimensions and N subband / N timedomainlength Four or five indices corresponding to the dimensions may be applied. In indexing, oversampling [factors] (e.g., N1 / N2 / N3 / N) may be applied. subband / N timedomainlength O1 / O2 / O3 / O corresponding to each dimension subband / O timedomainlength ) may or may not be considered.

[0283] - Option A-2 Non-structured indexing may be applied. A third embodiment may be applied to this option.

[0284] For example, if the full set has Z vectors [of SD / FD / DD basis, DFT, or spherical wave], each vector may be assigned an index 0, 1, ..., Z-1. Such unstructured indexing can be applied to any of the multiple options 1-x of the second embodiment of the SD / FD / DD basis type.

[0285] For some domains, structured indexing may be applied, while for others, unstructured indexing may be applied. Whether structured or unstructured indexing is applied to each domain may be predefined by the specification, configured / instructed by the network via RRC / DCI / MAC CE / SIB, or reported by the user audience as user audience capability.

[0286] ◆Option B For Option 2 of Embodiment 2, indexing does not have to be applied (it does not have to be required), and indexing may be provided with the downloaded data (it may be downloadable).

[0287] <Third Embodiment> This embodiment relates to the setting / instruction of a configurable codebook.

[0288] Regarding the setting / instruction of the configurable codebook, at least one of the following multiple embodiments 3-x may be applied.

[0289] <<Embodiment 3-1>> This embodiment relates to signaling for setting / indicating one or more SD vectors. One or more SD vectors may be set / indicated via signaling (e.g., RRC / DCI / MAC CE), or a specific range (e.g., a range of indices) that represents one or more SD vectors may be set / indicated.

[0290] For an index pointing to one SD vector in the full set of SD vectors, at least one of the following options x may be applied.

[0291] ◆Option A: One index may indicate one SD vector. In other words, each SD vector [included in the full set] may be assigned one index.

[0292] -◆Option A-1 A single index may indicate one of N1N2 (or N1N2O1O2) vectors.

[0293] For example, each vector may be assigned an index of 0, 1, ..., N1N2-1 (or 0, 1, ..., N1N2O1O2-1).

[0294] -◆Option A-2 A single index may indicate one of N1N2N3 (or N1N2N3O1O2O3) vectors.

[0295] For example, each vector may be assigned an index of 0, 1, ..., N1N2N3-1 (or 0, 1, ..., N1N2N3O1O2O3-1).

[0296] As a variation, there may be no oversampling O3 for N3 dimensions. In this case, one index may indicate one of N1N2N3O1O2 vectors. For example, each vector may be assigned an index of 0, 1, ..., N1N2N3O1O2-1.

[0297] - Option A-3 A single index may indicate one of the Z vectors.

[0298] For example, each vector may be assigned an index of 0, 1, ..., Z-1.

[0299] Figure 8A shows an example of specifying an SD vector by index according to option A of Embodiment 3-1. As in this example, one index i (for example, i=0,1,...,N1N2N3-1) corresponds to one SD vector W. i This may be instructed.

[0300] ◆Option B A single SD vector may be indicated by two indices. In other words, every SD vector [included in the full set] may be assigned two indices.

[0301] -◆Option B-1 One (first) index may indicate one of N1 (or N1O1) vectors, and another (second) index may indicate one or more of N2 (or N2O2) vectors.

[0302] -◆Option B-2 One (first) index may indicate one of one or more one-dimensional vectors, and another (second) index may indicate one of one or more combined two-dimensional vectors.

[0303] For example, the first index may indicate one of N3 (or N3O3) vectors, and the second index may indicate one of N1N2 (or N1N2O1O2) vectors. For example, each one-dimensional vector may be assigned the first index 0,1,...,N3-1 (or 0,1,...,N3O3-1), and each combined two-dimensional vector may be assigned the second index 0,1,...,N1N2-1 (or 0,1,...,N1N2O1O2-1).

[0304] For example, the first index may indicate one of N1 (or N1O1) vectors, and the second index may indicate one of N2N3 (or N2N3O2O3) vectors. For example, each one-dimensional vector may be assigned the first index 0,1,...,N1-1 (or 0,1,...,N1O1-1), and each combined two-dimensional vector may be assigned the second index 0,1,...,N2N3-1 (or 0,1,...,N2N3O2O3-1).

[0305] Figure 8B shows an example of an index for an SD vector according to option B of Embodiment 3-1. As in this example, a single SD vector W is formed by a first index i1 (e.g., i1=0,1,...,N1-1) and a second index i2 (e.g., i2=0,1,...,N2N3-1). i1,i2 This may be instructed.

[0306] ◆Option C A single SD vector may be indicated by three indices. In other words, all SD vectors [included in the full set] may each be assigned three indices.

[0307] - Option C-1 Three indices may indicate three one-dimensional vectors.

[0308] For example, the first index may indicate one of N1 (or N1O1) vectors, the second index may indicate one of N2 (or N2O2) vectors, and the third index may indicate one of N3 (or N3O3) vectors. For example, each of the N1 (or N1O1) one-dimensional vectors may be assigned the first index 0,1,...,N1-1 (or 0,1,...,N1O1-1), each of the N2 (or N2O2) one-dimensional vectors may be assigned the second index 0,1,...,N2-1 (or 0,1,...,N2O2-1), and each of the N3 (or N3O3) one-dimensional vectors may be assigned the third index 0,1,...,N3-1 (or 0,1,...,N3O3-1).

[0309] Figure 8C shows an example of an index for an SD vector according to option C of Embodiment 3-1. As in this example, a single SD vector W is formed by a first index i1 (e.g., i1=0,1,...,N1-1), a second index i2 (e.g., i2=0,1,...,N2-1), and a third index i3 (e.g., i3=0,1,...,N3-1). i1,i2,i3 This may be instructed.

[0310] For multiple indices that point to multiple SD vectors within the full set of SD vectors, at least one of the following Alt. x may be applied:

[0311] ◆Alt. 1 It may be predefined [in the specification] that there are no constraints / relationships between multiple SD vectors that are set / instructed. Alternatively, information indicating that there are no such constraints / relationships may be set / instructed to the UE.

[0312] ◆Alt. 2 A constraint / relationship may be predefined [in the specification] that multiple SD vectors set / instructed to be included in one orthogonal SD vector group. Alternatively, such a constraint / relationship may be set / instructed to the UE. One orthogonal SD vector group may consist of N1*N2 orthogonal SD vectors that are not oversampled, out of N1*O1*N2*O2 SD vectors that are oversampled. The spacing of orthogonal SD vectors in N1 dimensions may consist of 1 SD basis out of N1*O1 SD bases that are oversampled. The spacing of orthogonal SD vectors in N2 dimensions may consist of 2 SD bases out of N2*O2 SD bases that are oversampled.

[0313] ◆Alt. 3 Constraints / relationships may be predefined [in the specification] such that multiple set / instructed SD vectors are contained within a specific range in N1 / N2 / N3 dimensions, or within a specific range among Z vectors. Furthermore, constraints / relationships may be predefined [in the specification] such that multiple set / instructed SD vectors are adjacent to each other within that specific range. Alternatively, such constraints / relationships may be set / instructed for the UE.

[0314] The signaling format for setting / instructing multiple indexes may differ depending on which of the above Alt. 1 / 2 / 3 is applied. Regarding the signaling format, at least one of the following Alt. x may be applied.

[0315] -◆Alt. A The index may be set / instructed separately for each SD vector. Options A / B / C of Embodiment 3-1 may be applied to the index of each SD vector.

[0316] -◆Alt. B One or more orthogonal SD vector groups may be predefined [in the specification] or set / instructed [in advance]. One of the SD vector groups from the one or more orthogonal SD vector groups (for example, one or more N1N2 / N1N2N3 / O1O2 / O1O2O3 groups) may be set / instructed. One or more SD vectors from the set / instructed SD vector group may be further set / instructed by separate settings / instructions for each SD vector, or by settings / instructions for rearrangements / combinations of multiple SD vectors.

[0317] -◆Alt. C A range containing multiple SD vectors may be set / indicated. For example, a range containing multiple SD vectors may be set / indicated via a predefined range distribution [in the specification] and the setting / indication of a range ID. Alternatively, a range containing multiple SD vectors may be set / indicated via the indication of the first SD vector and a predefined or set range [in the specification] for that first SD vector.

[0318] For example, if the first SD vector (n1, n2, n3) of a range is set, and the number of SD vectors included in that range (M1, M2, M3) is set, the range containing multiple SD vectors may be between (n1, n2, n3) and (n1+M1-1, n2+M2-1, n3+M3-1).

[0319] Alt. C may be applied in combination with Alt. B. For example, the first SD vector in Alt. C may be set / indicated by Alt. B from one or more orthogonal SD vector groups.

[0320] -◆Alt. D One or more SD vectors within a range containing multiple SD vectors may be further set / instructed by separate settings / instructions for each SD vector, or by settings / instructions for sorting / combining multiple SD vectors. The range containing the multiple SD vectors may be set / instructed based on Alt. C, and the one or more SD vectors may be one or more SD vectors different from the first SD vector in Alt. C.

[0321] For example, from a range that includes multiple SD vectors (between (n1,n2,n3) and (n1+M1-1,n2+M2-1,n3+M3-1)), one or more SD vectors different from the first SD vector (n1,n2,n3) may be further set / specified (e.g., (n1+M1-1,n2,n3), (n1,n2+M2-2,n3+M3-3), (n1+M1-1,n2+M2-1,n3+M3-1)).

[0322] <<Embodiment 3-2>> This embodiment relates to signaling for setting / indicating one or more SD and FD / DD vectors. One or more SD / FD / DD vectors may be set / indicated via signaling (e.g., RRC / DCI / MAC CE), or a specific range (e.g., a range of indices) that represents one or more SD / FD / DD vectors may be set / indicated.

[0323] For setting / instructing one or more vectors of SD and FD / DD, at least one of the following options x may be applied.

[0324] ◆Option A: The vectors for each domain (SD / FD / DD) may be set / instructed separately.

[0325] Regarding the SD vectors, the setting / instruction of one or more SD vectors may be in accordance with Embodiment 3-1.

[0326] Regarding the FD vector, N subband One of the FD vectors among the vectors may be set / specified. Also, N subbandMultiple FD vectors within a given vector may be set / instructed by separate settings / instructions for each FD vector, by settings / instructions for sorting / combining multiple FD vectors, or by a specific range.

[0327] Regarding DD vectors, N timedomainlength One of the vectors may be set / specified. Also, N timedomainlength Multiple DD vectors within a given vector may be set / instructed by separate settings / instructions for each DD vector, by settings / instructions for sorting / combining multiple DD vectors, or by a specific range.

[0328] ◆Option B: One or more vectors of SD and FD / DD may be set / indicated together.

[0329] For example, all SD and FD / DD vectors may be indexed sequentially in ascending or descending order within a single queue. One or more SD and FD / DD vectors among all SD and FD / DD vectors may be set / indicated by that index.

[0330] For example, one or more SD and FD / DD vectors may be set / indicated via a first SD-FD / -DD instruction and a range of SD / FD / DD predefined or set [in the specification] for that first SD-FD / -DD.

[0331] The network (NW) may set multiple vectors (pairs / combinations) for the user (UE) in such a way that it is transparent to the UE which vector (pair / combination) is SD / FD / DD. In other words, the NW does not need to set / instruct the UE which vector (pair / combination) is SD / FD / DD.

[0332] <<Embodiment 3-3>> This embodiment has a wideband coefficient W coeff_wb Regarding signaling for setting / instructing W coeff_wbThis may include only amplitude information, or it may include both amplitude and phase adjustment information.

[0333] Regarding the amplitude setting, at least one of the following options x may be applied.

[0334] ◆Option 1 The absolute value may be set / indicated for each SD / FD / DD vector (or each SD-FD / -DD). The absolute value may be quantized to a certain number of bits (e.g., x bits) and set / indicated by the bit value.

[0335] ◆Option 2 May be set / indicated by the difference value with another vector [pair / combination]. The difference value may be quantized to a certain number of bits (e.g., y bits) and set / indicated by the bit value. The other vector [pair / combination] may be the best (highest quality) vector [pair / combination], or may be set / indicated by NW [along with the difference value].

[0336] For setting the phase adjustment, a reference SD / FD / DD vector (or reference SD-FD / -DD) may be set / indicated / reported. The phase adjustment of other vectors [pairs / combinations] may be determined / quantized based on the phase information of the reference vectors [pairs / combinations].

[0337] <Fourth Embodiment> This embodiment relates to mapping between configurable codebooks and layers. The mapping between one or more configured SD vectors and one or more layers may be predefined [in the specification] or may be configured / instructed by RRC / MAC CE / DCI.

[0338] This embodiment assumes one or more SD vectors as the configurable codebook, but the application of this embodiment is not limited to this. This embodiment can also be applied when the configurable codebook is one or more vectors of SD and FD / DD.

[0339] Regarding the mapping between configurable codebooks and layers, at least one of the following Alt. x may be applied.

[0340] ◆Alt. 1 The same one or more SD vectors may be mapped to multiple different layers. For mapping between the same one or more SD vectors and multiple different layers, at least one of the following Alt. 1-x may be applied.

[0341] -Alt. 1-1 A single common SD vector may be mapped to multiple different layers. For example, only one SD vector may be set / instructed.

[0342] Figure 9A shows an example of mapping between SD vectors and layers according to Alt. 1-1 of the fourth embodiment. As in this example, multiple different layers (e.g., L1,...,L) can be mapped. X2 For each of these, one common SD vector (e.g., W1) may be mapped.

[0343] -Alt. 1-2 Multiple common SD vectors may be mapped to multiple different layers. For example, multiple SD vectors may be set / instructed to be common to all layers.

[0344] Figure 9B shows an example of mapping between SD vectors and layers according to Alt. 1-2 of the fourth embodiment. As in this example, multiple different layers (e.g., L1,...,L) can be mapped. X2 For each of the following, X1 common SD vectors (for example, W1,...,W X1 ) may be mapped.

[0345] ◆Alt. 2 Different / separate SD vectors may be mapped to multiple different layers. For mapping between different / separate SD vectors and multiple different layers, at least one of the following Alt. 2-x may be applied.

[0346] -Alt. 2-1 One SD vector may be mapped to one layer. For example, X SD vectors may be set / instructed for X layers.

[0347] Figure 10A shows an example of mapping between SD vectors and layers according to Alt. 2-1 of the fourth embodiment. As in this example, multiple different layers (e.g., L1,...,L X For each of these, one different SD vector (for example, W1,...,W X ) may be mapped.

[0348] -Alt. 2-2 A single SD vector may be mapped to multiple layers. For example, if one SD beam is mapped to two layers, X / 2 SD beams may be set / instructed for X layers.

[0349] Figure 10B shows an example of mapping between SD vectors and layers according to Alt. 2-2 of the fourth embodiment. As in this example, multiple different layers (e.g., L1,...,L) can be mapped. X For each of the two layers, there is one different SD vector (for example, W1,...,W X / 2 ) may be mapped.

[0350] -Alt. 2-3 Multiple SD vectors may be mapped to a single layer. For example, if X1 SD beams are mapped to one layer, X1*X2 SD beams may be set / instructed for X2 layers.

[0351] Figure 10C shows an example of mapping between SD vectors and layers according to Alt. 2-3 of the fourth embodiment. As in this example, multiple different layers (e.g., L1,...,L) are used. X2 For each of the ) layers, X1 different SD vectors may be mapped. In this case, for a total of X2 layers, a total of X1*X2 SD vectors (e.g., W1,...,W X1*X2 ) may be mapped.

[0352] -Alt. 2-4 Multiple SD vectors may be mapped to multiple layers. For example, if X1 SD beams are mapped to two layers, (X1*X2) / 2 SD beams may be set / instructed for X2 layers.

[0353] Alt. 2-1 / 2-2 may apply to Type 1 [like] CSIs, and Alt. 2-3 / 2-4 may apply to [extended] Type 2 [like] CSIs.

[0354] Figure 10D shows an example of mapping between SD vectors and layers according to Alt. 2-4 of the fourth embodiment. As in this example, multiple different layers (e.g., L1,...,L) can be mapped. X2 For each of the two layers, X1 different SD vectors may be mapped. In this case, for a total of X2 layers, a total of (X1*X2) / 2 SD vectors (e.g., W1,...,W) may be mapped. (X1*X2) / 2 ) may be mapped.

[0355] One or more of the above-mentioned Alt. 1-1 / 1-2 / 2-1 / 2-2 / 2-3 / 2-3 may be applied to one or more different rank / layer / codebook types.

[0356] When the same SD beam is mapped to multiple layers, the phase offset between the layers may be predefined [in the specification] or set / instructed / reported to the UE. This ensures orthogonality between different layers.

[0357] <Supplement> <<Notification of Information to UE / BS>> In the embodiments described above, notification of any information from the Network (NW) (e.g., Base Station (BS)) / NW node) to the UE / BS (in other words, reception of any information from the BS / NW node at the UE / BS) may be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE, NAS signaling, LPP messages, NRPPa messages), specific signals / channels (e.g., PDCCH, PDSCH, reference signals), or a combination thereof.

[0358] If the above notification is made by a MAC CE, the MAC CE may be identified by the inclusion of a new Logical Channel ID (LCID) not defined in existing standards in the MAC subheader.

[0359] If the above notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble the Cyclic Redundancy Check (CRC) bits assigned to the DCI, or the format of the DCI.

[0360] Furthermore, the notification of arbitrary information to the UE / BS in the above-described embodiments may be periodic, semi-persistent, or aperiodic. Semi-persistent or aperiodic notification of information may be triggered by instructions from the UE / BS / NW.

[0361] In the embodiments described above, the UE may receive information from the NW of at least one of the following QCL rules: ◆ QCL Type A ◆ QCL Type B ◆ QCL Type C ◆ QCL Type D

[0362] In the embodiments described above, the QCL source RS for each QCL type may be at least one of the following RSs: ◆SSB ◆CSI-RS with / without repetition ◆TRS ◆DMRS for PDCCH / PDSCH

[0363] In the embodiments described above, information from the network may be set / instructed by any or a combination thereof in the following ways: - Common to multiple UEs, or individual to each UE (per UE); - Common to multiple BSs, or individual to each BS (per BS); - Common to multiple frequencies (e.g., one or a combination thereof, such as a cell, band, band combination, bandwidth part (BWP), component carrier, etc.), or frequency-specific (per frequency, e.g., per cell).

[0364] <<Notification of Information from UE / BS>> Notification of any information from UE / BS to the NW in the embodiments described above (in other words, transmission / reporting of any information from UE / BS to BS / NW nodes) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE, NAS signaling, LPP messages, NRPPa messages), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0365] If the above notification is made by a MAC CE, the MAC CE may be identified by the inclusion of a new LCID not specified in existing standards in the MAC subheader.

[0366] If the above notice is made by the UCI, the notice may be transmitted using PUCCH or PUSCH.

[0367] Furthermore, notifications of arbitrary information from the UE / BS in the above-described embodiments may be periodic, semi-persistent, or aperiodic. Semi-persistent or aperiodic notifications of information may be triggered by instructions from the UE / BS / NW.

[0368] <<Regarding the application of each embodiment>> In a UE / BS, specific (e.g., one or more, or some) processing / operation / control / assumption / information for at least one of the embodiments described above may be applied (or used) if any or more of the following conditions are met: - A higher-layer parameter indicating the specific processing / operation / control / assumption / information is set in the UE / BS; - The specific processing / operation / control / assumption / information is determined in the UE / BS based on the relevant higher-layer parameter; - The specific processing / operation / control / assumption / information is designated / activated / triggered for the UE / BS by MAC CE / DCI / UCI / Resource / Channel / RS; - The UE / BS reports or supports a specific capability (e.g., UE capability) indicating (or related to) the specific processing / operation / control / assumption / information; - The application of the specific processing / operation / control / assumption / information is determined in the UE / BS based on specific conditions.

[0369] The above-mentioned specific capabilities may represent at least one of the following: ◆ Supporting the above-mentioned specific processing / operation / control / assumption / information; ◆ The capabilities of each embodiment; ◆ The capabilities of each option in each embodiment, or the capabilities of a combination of multiple options in each embodiment; ◆ The capabilities of each choice in each embodiment, or the capabilities of a combination of multiple choices in each embodiment.

[0370] In this disclosure, "to support" and "whether or not to support" may be interpreted interchangeably.

[0371] Furthermore, the above-mentioned specific capabilities may be capabilities that apply across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., one or a combination thereof, such as cell, band, band combination, BWP, component carrier, etc.), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), capabilities per subcarrier spacing (SCS), or capabilities per feature set (FS) or feature set per component-carrier (FSPC).

[0372] Furthermore, the specific capabilities described above may be capabilities that apply across all duplexing schemes (common to all duplexing schemes regardless of the duplexing scheme), or they may be capabilities specific to each duplexing scheme (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0373] If the above conditions are not met, UE / BS may follow the behavior specified in existing 3GPP releases.

[0374] Information regarding whether one or more of the above embodiments / options / choices / examples apply / are used, or which of the above embodiments / options / choices / examples apply / are used, may be based on several of the following methods: ◆ The information is set by one or more higher layer parameters / RRC IEs. ◆ The information is determined by one or more relevant higher layer parameters / RRC IEs. ◆ The information is indicated by MAC CE / DCI. ◆ The information is determined based on one or more UE capabilities. ◆ The information is described / defined in the specification. ◆ The information is based on conditions described / defined in the specification. ◆ The information is determined by a combination of several of the above methods. For example, the information is determined by the setting / indication of higher layer parameters / MAC CE / DCIs and reported by UE capabilities.

[0375] The above multiple embodiments / options / choices may be combined into a single embodiment / option / choice.

[0376] In the embodiments described above, the measured RS may be a QCL source RS in an active TCI state / indicated / unified TCI state.

[0377] (Note) The following inventions are added with respect to one embodiment of the present disclosure. [Note 1] A terminal having: a receiving unit that receives settings for one or more spatial domain (SD) vectors mapped to one or more layers; and a control unit that reports channel state information (CSI) of a domain different from the SD based on the one or more SD vectors. [Note 2] The terminal according to Note 1, wherein the control unit reports at least one of the one or more SD vectors. [Note 3] The terminal according to Note 1 or Note 2, wherein the receiving unit receives at least one of settings for one or more frequency domain (FD) vectors and settings for one or more Doppler domain (DD) vectors. [Note 4] The terminal according to any one of Notes 1 to 3, wherein the one or more SD vectors have one or more indices corresponding to two or more dimensions. [Note A] A base station having a transmitting unit that transmits settings relating to one or more spatial domain (SD) vectors mapped to one or more layers, and a control unit that controls the reception of channel state information (CSI) of a domain different from the SD based on the one or more SD vectors. <Supplement> The terminal in Notes 1 to 4 may be a user terminal 20. The receiving unit / transmitting unit in Notes 1 to 4 may be a transmitting / receiving unit 220. The control unit in Notes 1 to 4 may be a control unit 210. The base station in Note A may be a base station 10. The receiving unit / transmitting unit in Note A may be a transmitting / receiving unit 120. The control unit in Note A may be a control unit 110.

[0378] (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 of the wireless communication methods according to the above embodiments of this disclosure, or a combination thereof.

[0379] Figure 11 shows an example of a schematic configuration of a wireless communication system according to one embodiment of the present disclosure. The wireless communication system 1 (which may also be simply called 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).

[0380] 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 the like.

[0381] 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.

[0382] 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))).

[0383] 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. Terminals 20 may be located within at least one cell. The arrangement, number, shape, size, etc., of each cell and 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.

[0384] The wireless communication system 1 may utilize Multi Input Multi Output (MIMO). For example, one cell may be formed by one antenna / base station 10, or by multiple antennas / base stations 10. One [virtual] cell (which may be called a supercell, for example) may be composed of multiple [virtual] cells (which may be called subcells, for example). A supercell may correspond to a cell with a fixed physical range, and a subcell may correspond to a cell whose physical range fluctuates quasi-statically / dynamically. In this case, the wireless communication system 1 may be called a cell-free system.

[0385] Terminal 20 may be connected to at least one of the multiple base stations 10. Terminal 20 may utilize at least one of Carrier Aggregation (CA) using multiple Component Carriers (CC) and Dual Connectivity (DC).

[0386] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz. Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be in a frequency band higher than FR2.

[0387] Furthermore, terminal 20 may communicate in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0388] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 / Xn interface, etc.) or wireless (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0389] 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, 5GC), Next Generation Core (NGC), etc.

[0390] The core network 30 may include, for example, network functions (Network Functions (NFs)) such as User Plane Function (UPF), Access and Mobility Management Function (AMF), Session Management Function (SMF), Unified Data Management (UDM), Application Function (AF), Data Network (DN), Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM)). Multiple functions may be provided by a single network node (which may simply be called a node). Furthermore, communication with an external network (e.g., the Internet) may occur via the DN.

[0391] Terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0392] 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-OFDM), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0393] 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.

[0394] 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, which is shared by each terminal 20.

[0395] 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 Random Access Channel (PRACH), or the like, all of which are shared by each terminal 20.

[0396] 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.

[0397] 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.

[0398] Furthermore, the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc., and the DCI that schedules PUSCH may be called UL grant, UL DCI, etc. Furthermore, PDSCH may be read as DL data, and PUSCH may be read as UL data.

[0399] 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. A UE may monitor CORESETs associated with a given search space based on the search space configuration.

[0400] 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.

[0401] PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgment information (for example, 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.

[0402] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted from the names of various channels.

[0403] 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, the DL-RS may include 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.

[0404] 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. Note that SS, SSB, etc. may also be called reference signals.

[0405] Furthermore, in the wireless communication system 1, the uplink reference signal (UL-RS) may include a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. The DMRS may also be called a user-specific reference signal (UE-specific Reference Signal).

[0406] (Base Station) Figure 12 shows an example of the configuration of a base station according to one embodiment of the present disclosure. The base station 10 includes a control unit 110, a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmitting / receiving unit 120, the transmitting / receiving antenna 130, and the transmission line interface 140 may be provided.

[0407] 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.

[0408] 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 technical field related to this disclosure.

[0409] 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 transmitting / receiving unit 120, transmitting / receiving antenna 130, and 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 transmitting / receiving 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 wireless resources, etc.

[0410] 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.

[0411] 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.

[0412] 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.

[0413] 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.

[0414] The transmitting / receiving unit 120 may use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like to form at least one of the transmitting beam and the receiving beam.

[0415] 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), and the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), to generate a bit sequence to be transmitted.

[0416] 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.

[0417] 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.

[0418] 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.

[0419] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (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.

[0420] 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.

[0421] The transmission path interface 140 may send and receive signals (backhaul signaling) with devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the terminal 20.

[0422] 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.

[0423] The base station 10 may be separated into three elements: a Radio Unit (RU), a Distributed Unit (DU), and a Central Unit (CU). For example, the RU may implement RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level physical layer functions (precoding, IFFT, FFT, etc.). The DU may implement higher-level physical layer functions (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may implement PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer functions.

[0424] In this disclosure, base station 10 may include a single device that implements all the functions of RU, DU, and CU, or it may include multiple devices that each implement some of the functions of RU, DU, and CU and are connected to each other. In this disclosure, base station 10 may be interpreted as RU / DU / CU.

[0425] (Terminal) Figure 13 shows an example of the configuration of a terminal according to one embodiment of the present disclosure. The 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.

[0426] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0427] The control unit 210 performs control of the entire 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.

[0428] 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.

[0429] 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.

[0430] 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.

[0431] 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.

[0432] 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.

[0433] The transmitting / receiving unit 220 may use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like to form at least one of the transmitting beam and the receiving beam.

[0434] 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 to generate a bit sequence to be transmitted.

[0435] 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.

[0436] 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.

[0437] 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.

[0438] 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.

[0439] 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.

[0440] 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.

[0441] The measurement unit 223 may derive channel measurements for CSI calculation based on channel measurement resources. Channel measurement resources may be, for example, Non Zero Power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on interference measurement resources. Interference measurement resources may be at least one of the following: NZP CSI-RS resources for interference measurement, CSI-Interference Measurement (IM) resources, etc. CSI-IM may also be called CSI-Interference Management (IM), and may be interpreted interchangeably with Zero Power (ZP) CSI-RS. In this disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc., may be interpreted interchangeably.

[0442] In this disclosure, the transmitting unit and receiving unit of the terminal 20 may be composed of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0443] (Hardware Configuration) The block diagram used in the description of the above embodiment shows functional units. These functional blocks (components) are realized by hardware, software, or a combination thereof. 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.

[0444] For example, a base station, terminal, network node, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 14 is a diagram showing an example of the hardware configuration of a base station and terminal according to one embodiment of the present disclosure. The base station 10 and 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.

[0445] In this disclosure, any two terms selected from the set of terms such as apparatus, circuit, device, section, unit, module, chip, and means may be read as interchangeable. The hardware configuration of the base station 10 and 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.

[0446] Each function in the base station 10 and 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 the reading, writing, or both of the reading and writing of data in the memory 1002 and storage 1003.

[0447] 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 devices, 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. Although only one processor 1001 is shown, there may be multiple processors.

[0448] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from the storage 1003, the communication device 1004, or both 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.

[0449] The various processes described above may be executed by a single processor 1001, or by two or more processors 1001 simultaneously, sequentially, or by other means. The processor 1001 may be implemented using one or more chips. The program may be transmitted from a network via a telecommunications line, or provided to the computer device via, for example, a communication device 1004.

[0450] Furthermore, this disclosure also provides a computer program product, which includes a computer program. This computer program product may implement the steps of the method described in the above embodiments when the computer program is executed by a computer (for example, a processor 1001).

[0451] Memory 1002 is a non-temporary computer-readable recording medium and may consist of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or at least two combinations thereof. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of the present disclosure.

[0452] The storage 1003 is a [non-temporary] computer-readable recording medium, which may consist of, for example, a flexible disk, a floppy disk, an optical disk (e.g., Compact Disc ROM (CD-ROM), etc.), a digital multipurpose disk, a Blu-ray disk), a magneto-optical disk, a removable disk, a hard disk drive, a smart card, flash memory (e.g., a card, stick, key drive), a magnetic stripe, or at least two of these. The storage 1003 may also be called an auxiliary storage device.

[0453] The recording medium described above may be, for example, a memory 1002, a storage 1003, or a database, server, or other suitable medium including both the memory 1002 and the storage 1003.

[0454] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via a wired network, a wireless network, or both wired and wireless networks, 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 a high-frequency switch, duplexer, filter, frequency synthesizer, or at least two combinations thereof. For example, the above-mentioned transmit / receive unit 120 (220), transmit / receive antenna 130 (230), etc., may be implemented by the communication device 1004. The transmit / receive unit 120 (220) may be implemented in physically or logically separated form, consisting of a transmit unit 120a (220a) and a receive unit 120b (220b).

[0455] 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., or at least two combinations thereof). 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., or at least two combinations thereof). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0456] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0457] Furthermore, the base station 10 and terminal 20 may be configured with hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), a graphics processing unit (GPU), a neural processing unit (NPU), or a combination of at least two of these, and some or all of each functional block may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0458] In this disclosure, the term “processor” may encompass a single processor or a group of processors, for example, a single-core processor, a multi-core processor, multiple processors in a single device, or multiple processors that can communicate with each other by wire or wireless means. Similarly, the term “[non-temporary] computer-readable recording medium” may encompass a single storage medium or a group of storage mediums, or multiple storage mediums that can communicate with each other by wire or wireless means.

[0459] The devices in this disclosure, such as processors and storage media, may be distributed locally or remotely, and may perform processing by operating cooperatively or independently using buses, networks, the internet, clouds, etc.

[0460] Furthermore, devices included in the core network 30 (for example, network nodes that provide NF) may also be implemented using the functional block / hardware configuration described above.

[0461] (Modifications) Each aspect / embodiment described in this disclosure is Long Term Evolution (LTE), LTE-Advanced (LTE-A), International Mobile Telecommunications-Advanced (IMT-Advanced), 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G-Advanced (5G-A), 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 (NR), New radio access (NX), Future generation radio access (FX), Open Radio Access Network (Open RAN (O-RAN)), Wideband Code Division Multiple Access (W-CDMA®), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.11x (where x is any string such as b, a, g, n, ac, ax, be, bn, etc., and x=n is Wi-Fi4, x=ac is Wi-Fi5, x=ax is Wi-Fi6 or Wi-Fi6E, x=be is Wi-Fi7, x=bn is Wi-Fi8, etc.)The invention may also be applied to systems based on technologies such as Wi-Fi (a registered trademark), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth®, network virtualization technologies (e.g., Network Function Virtualization (NFV), Service Function Chaining (SFC), Software Defined Networking (SDN)), or Low Power Wide Area (LPWA). Furthermore, each aspect / embodiment described in this disclosure may be applied to systems based on a combination of at least two of these technologies. Hereinafter, "based on" means not only systems that utilize the technologies, but also systems that utilize extensions or modifications of the technologies.

[0462] In this disclosure, the terms "Base Station (BS)", "Radio Base Station", "Fixed Station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "Access Point (AP)", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "Radio Unit (RU)", "Remote Unit (RU)", "Control Unit (CU)", "Distributed Unit (DU)", "Remote Radio Head (RRH)", "Node", "Gateway", "Ground Base Station", "Stratospheric Base Station", "Unmanned Aerial Vehicle", "High Altitude Platform Station (HAPS)", "Airborne Platform", "Panel", "Cell", and "Radio Access Network (Radio Access)" are used. Any two terms selected from the set of terms such as "Network (RAN)" and "Network" may be used interchangeably. Each cell accommodated by a base station may be referred to by terms such as macrocell, small cell, femtocell, picocell, serving cell, or supercell. In this disclosure, any two terms selected from the set of terms such as "cell," "sector," "cell group," "carrier," "component carrier," "cluster," "bandwidth part (BWP)," and "carrier bandwidth" may be used interchangeably.

[0463] In this disclosure, any two terms selected from the set of terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "Device", "module", and "terminal" may be used interchangeably.

[0464] The terminal may 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, router (e.g., home router, mobile router, etc.), Telematics Control Unit (TCU), or some other appropriate term.

[0465] A base station and a terminal may each consist of one or more devices. At least some of the devices constituting a base station and a terminal may be called a transmitting device, a receiving device, a wireless communication device, etc. Furthermore, the devices constituting at least a part of each base station and terminal may be, but are not limited to, objects themselves such as 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, unmanned aerial vehicles, stratospheric base stations (e.g., High Altitude Platform Stations (HAPS)), artificial satellites (e.g., Low Earth Orbit (LEO) satellites, Middle Earth Orbit (MEO) satellites, Geostationary Earth Orbit (GEO) satellites), drones (registered trademark), multicopters, quadcopters, balloons, and Internet of Things (IoT) devices (e.g., smart meters, sensors), or include, but are not limited to, objects or devices mounted on such objects. Furthermore, the object in question may be a moving object (hereinafter referred to as a "moving object," without prejudice that the moving object may be in a stationary state) or a fixedly positioned object (hereinafter referred to as a "non-moving object").

[0466] Furthermore, the term "base station" in this disclosure may be interpreted as "terminal." For example, the various aspects / embodiments of this disclosure may be applied to configurations in which communication between a base station and a terminal is replaced with communication between multiple terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.) or communication over a Non-Terrestrial Network (NTN). In this case, the 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") or terms corresponding to NTN (for example, feeder link, service link). For example, uplink channel, downlink channel, etc., may be interpreted as sidelink channel.

[0467] Furthermore, this disclosure is also applicable when at least some of the equipment constituting the base station and terminal operates outside of the ground (for example, in the atmosphere or in outer space).

[0468] Similarly, the term "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 terminal 20 described above.

[0469] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node, or by a part of it (e.g., CU, RU, DU, etc.). It is clear that various operations performed for communication with terminals in a RAN or core network may be performed by at least a part of the base station and other network nodes other than the base station. The other network nodes may be a single node or a combination of multiple nodes. A network node is, for example, a node provided in various core networks such as an Evolved Packet Core (EPC) or a 5G Core Network (5GCN, 5GC), and provides one or more Network Functions (NFs).

[0470] Furthermore, in this disclosure, the action of "a terminal receiving information from a base station" is accompanied by the actions of "a base station transmitting the information to the terminal," "a base station generating the information," or both. Similarly, the action of "a terminal transmitting information to a base station" is accompanied by the action of "a base station receiving the information from the terminal." In addition, actions such as "a terminal is configured to..." or "a terminal is configured to..." may include the actions of "a base station transmitting configuration information regarding the terminal's settings" or "the terminal configuring a predetermined action based on the configuration information."

[0471] 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 at least two combinations thereof.

[0472] Physical layer signaling may also be called Layer 1 (L1) control information. MAC signaling may be called, for example, a MAC control element (CE), a MAC protocol data unit (PDU), etc. RRC signaling may also be called an RRC message or an information element (IE) within such an RRC message. Such RRC signaling may be a message used for, for example, controlling an RRC connection (e.g., setup, reconfiguration, establishment, reestablishment, release, or resume), mobility, measurement report, terminal capability notification, etc., or it may be an information element within such a message.

[0473] Furthermore, notification of information may be explicit or implicit. Explicit notification of information means notifying the information itself, while implicit notification of information may be notification of other information or the fulfillment of certain conditions which constitutes notification of the information.

[0474] Furthermore, information notification may include not only notifications between the same layer of different devices (for example, between lower layers or upper layers of base station 10 and terminal 20), but also notifications between different layers within the same or different devices (for example, between lower layers and upper layers within base station 10 or terminal 20). Also, information notification from one device to another may be carried out via one or more devices.

[0475] Any information described in this disclosure (e.g., variables, constants, parameters, settings) may be communicated from any first device (e.g., terminal / base station) to any second device (e.g., base station / terminal) to any second device (e.g., base station / terminal) to any first device (e.g., base station / terminal) to any secondbase station) to any second device (e.g., base station / base station) to any second device (e.g., base station / base station) to any second device (e.g., base station / base station) to

[0476] 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 using exemplary order and are not limited to the specific order presented. Also, at least one step may be omitted in the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure.

[0477] 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.

[0478] In this disclosure, a radio resource may be defined as a combination of units of resources in one or more domains, such as the time domain, frequency domain, spatial domain, code domain, and power domain.

[0479] For example, a resource in the time domain (which may also be called a time resource) may be defined by one or more time units. These one or more time units may include, for example, a radio frame, a subframe, a slot, a symbol, and a transmission time interval (TTI), or at least two of these, but the names of the time units are not limited to these. Furthermore, these time units may be fixed-length time units that do not depend on numerology, variable-length time units that depend on numerology, or both.

[0480] Examples of fixed-length time units include, but are not limited to, subframes consisting of one or more slots, and wireless frames containing multiple subframes. Examples of variable-length time units include, but are not limited to, symbols and slots containing a fixed number of symbols. A certain time unit may be divided into shorter time units. Examples of shorter time units include, but are not limited to, mini-slots consisting of fewer symbols than the number of symbols that make up a slot. Such time units may include, for example, time units used as units for scheduling, link adaptation, etc. Furthermore, any time unit in this disclosure may be interpreted as a substitute for another time unit.

[0481] Numerology refers to parameters that define the physical layer structure, and may be parameters based on at least one of the following: subcarrier spacing (SCS), symbol length, cyclic prefix length, and sampling time.

[0482] Resources in the frequency domain (which may also be called frequency resources) may be defined, for example, by one or more frequency units. Such one or more frequency units may include, for example, subcarriers, resource blocks (RBs), bandwidth parts (BWPs), carrier bandwidths, or at least two combinations thereof, but the names of frequency units are not limited to these. Furthermore, the number of subcarriers included in a frequency unit may be a fixed number regardless of the neurology, or it may be a variable number that changes depending on the neurology.

[0483] For example, an RB consists of a predetermined number of consecutive subcarriers in the frequency domain, and the number of subcarriers included in the RB may be the same regardless of the neurology, and may be, for example, 12, but is not limited thereto. Also, a BWP may consist of, for example, one or more consecutive RBs within a certain carrier bandwidth, but is not limited thereto. One or more BWPs may be set up for a terminal 20 within a single carrier, and at least one of the BWPs may be activated. Furthermore, any frequency unit in this disclosure may be interpreted as any other frequency unit.

[0484] Furthermore, resources in both the time domain and the frequency domain may be defined in one or more time / frequency units, for example, consisting of time units and frequency units. Such time / frequency units are, but are not limited to, a Resource Element (RE) consisting of one symbol and one subcarrier, a Resource Element Group (REG) consisting of a predetermined number of REs, or a Control Resource Set (CORESET) consisting of a predetermined number of symbols and a predetermined number of RBs.

[0485] Resources in a spatial domain (which may also be called spatial resources) may be defined, for example, by one or more spatial units. Such one or more spatial units include, but are not limited to, beams, Multi Input Multi Output (MIMO) layers, antenna ports, or at least two combinations thereof.

[0486] Resources in the code domain (which may also be called code resources) may be defined, for example, by one or more code units. These one or more code units include, but are not limited to, cyclic shifts (CS), orthogonal cover codes (OCC), or combinations thereof.

[0487] 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.

[0488] In this disclosure, the words "decide," "determine," "judge," "select," "specify," "compute," "calculate," "process," "derive," "look up / search / inquiry," "confirm," "assume," "expect," and "consider" may be interpreted interchangeably. Also, in this disclosure, performing a certain process (e.g., sending, receiving) may be interpreted interchangeably with deciding to perform that process. Furthermore, in this disclosure, "do not assume that..." may be interpreted interchangeably with "assume that..."

[0489] In this disclosure, "expect" may be rephrased as "be expected." For example, "expect(s) ..." (where "..." may be expressed as a that clause, an infinitive, etc.) may be rephrased as "be expected ..." or "do (the verb without "to" if "..." is an infinitive)." Similarly, "does not expect ..." may be rephrased as "be not expected ..." or "do not (the verb without "to" if "..." is an infinitive)." Furthermore, "An apparatus A is not expected ..." may be rephrased as "An apparatus B other than apparatus A does not expect ... from apparatus A" (for example, if apparatus A is a UE, apparatus B may be a base station).

[0490] In this disclosure, "less than or equal to," "less than," "greater than or equal to," "more than," and "equal to" may be interpreted interchangeably. In addition, in this disclosure, words meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees. In addition, in this disclosure, words meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees, by adding "i-th" (where i is any integer) to the expression (for example, "highest" may be interpreted interchangeably with "i-th highest").

[0491] In this disclosure, "of," "for," "regarding," "related to," and "associated with" may be interpreted as being interchangeable.

[0492] In this disclosure, phrases such as "when A, B", "if A, then B", "B upon A", "B in response to A", "B based on A", "B during / while A", "B before A", "B at (the same time as) / on A", "B after A", "B since A", and "B until A" may be interchangeable. Furthermore, A, B, etc., may be replaced with appropriate expressions such as nouns, gerunds, or regular sentences depending on the context. The time difference between A and B may be approximately zero (immediately after or immediately before). Additionally, a time offset may be applied to the time when A occurs. For example, "A" may be interpreted as "before / after the time offset when A occurs". The time offset (e.g., one or more symbols / slots) may be predetermined or determined by the UE based on notified information.

[0493] In this disclosure, timing, time, duration, time instance, any unit of time (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc., may be interpreted interchangeably.

[0494] In this disclosure, terms such as “precoding,” “precoder,” “weight (precoding weight),” “quasi-co-location (QCL),” “transmission configuration indication state (TCI state),” “spatial relation,” “spatial relation information,” “spatial domain filter,” “transmit power,” “phase rotation,” “antenna port,” “port,” “layer,” “number of layers,” “rank,” “resource,” “resource set,” “beam,” “beam width,” “beam angle,” “antenna,” “antenna element,” “panel,” “UE panel,” “transmitting entity,” and “receiving entity” may be used interchangeably.

[0495] In this disclosure, "antenna port" may be interpreted interchangeably with "antenna port for any signal / channel (e.g., a DeModulation Reference Signal (DMRS) port)." In this disclosure, "resource" may be interpreted interchangeably with "resource for any signal / channel (e.g., a reference signal resource)." Furthermore, a spatial domain filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0496] In this disclosure, beam, sounding reference signal (SRS), resource indicator (SRS Resource Indicator (SRI)), control resource set (CORESET), CORESET pool, physical downlink shared channel (PDSCH), physical uplink shared channel (PUSCH), codeword (CW), transport block (TB), reference signal (RS) and the like may be interchangeable.

[0497] In this disclosure, TCI state, TCI, Downlink (DL) TCI state, Uplink (UL) TCI state, unified TCI state, common TCI state, joint TCI state, etc., may be interpreted interchangeably.

[0498] Furthermore, in this disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) properties," and "specific QCL type (e.g., Type A, Type D)" may be interpreted interchangeably.

[0499] In this disclosure, the terms index, identifier (ID), identity (ID), indicator, indication, resource ID, etc., may be interpreted interchangeably. In this disclosure, the terms sequence, list, set, group, cluster, subset, etc., may be interpreted interchangeably.

[0500] In this disclosure, the group may include, for example, at least one of the following: a spatial relationship group, a Code Division Multiplexing (CDM) group, an RS group, a CORESET group, a Physical Uplink Control Channel (PUCCH) group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, or a panel group.

[0501] The information in this disclosure (e.g., variables, constants, parameters, settings) may be interpreted as IDs of such information. For example, TCI status and TCI status ID may be interpreted as IDs of such information. In addition, the information in this disclosure may be interpreted as "a set of such information," "one or more such pieces of information," etc.

[0502] Any signal / channel in this disclosure (e.g., PUCCH) may be interpreted as another signal / channel (e.g., PUSCH, PDSCH, any RS). A signal / channel may be interpreted as a signal / channel for the same direction (e.g., if the above signal / channel is in the UL direction, it is UL, and if it is in the DL direction, it is DL), or as a signal / channel for the opposite direction (e.g., if the above signal / channel is in the UL direction, it is DL, and if it is in the DL direction, it is UL). Also, in this disclosure, descriptions relating to DL communication and descriptions relating to UL communication may be interpreted as one another. In this case, the operation of DL (UL) may be interpreted as the operation of the corresponding UL (DL). For example, the reception of PDSCH at a terminal may be interpreted as the transmission of PUSCH at the same terminal.

[0503] In this disclosure, "X's number," "X number," "the number of X(s)," and "a number of X(s)" may be interpreted as interchangeable. Herein, X may be replaced with a noun, gerund, or ordinary sentence as appropriate, depending on the context. In this disclosure, "number" may be interpreted as maximum number, minimum number, average number, total number, etc. Furthermore, in this disclosure, terms related to "value," "index," "number," and "quantity" may be interpreted as interchangeable.

[0504] Values / ranges in this disclosure may be interpreted as approximations, as if preceded by the words “about” or “near.” In this disclosure, “[A and B] [are] the same” (where A and B are any words) may mean “[A and B] [are] identical,” “[A and B] [are] almost the same,” “[A and B] [are] partly the same (or [partly] overlapped),” or “[There is] an error within a certain range [between A and B]” (i.e., these words may be interpreted as interchangeable). Furthermore, in this disclosure, "A and B are the same" may mean that at least part of A and at least part of B are the same (or overlapped).

[0505] In this disclosure, “one embodiment,” “several embodiments,” and “another embodiment” may be used interchangeably. In this disclosure, the terms “one embodiment,” “several embodiments,” and “another embodiment” do not necessarily all refer to the same embodiment, nor do they necessarily mean that they are mutually exclusive.

[0506] In this disclosure, expressions such as “at least one of A and B,” “at least one of A or B,” “A and / or B,” and “A / B” may be interpreted as including “only A,” “only B,” or “both A and B.” Furthermore, in this disclosure, expressions such as “at least one of A, B or C,” “at least one of A, B or C,” “A, B and / or C,” and “A / B / C” may be interpreted as including “only A,” “only B,” “only C,” “A and B,” “B and C,” “C and A,” or “all of A, B and C.” Similar reinterpretations may be applied to any expression in this disclosure that means "at least X of ..." (where the number of elements in "..." and X are arbitrary numbers).

[0507] In this disclosure, expressions such as “A, [and] B, and the like” / “such as A and B”,” “A, [or] B, or the like” / “such as A or B”,” “A, B, etc.” / “A, B, and so on” / “A, B, and so forth”,” and “A, B, [and / or] the others” may be interpreted as one another.

[0508] In this disclosure, expressions representing one / singular X (e.g., "a X," "one X," "a single X"), expressions representing one or more X (e.g., "one or more X(s)," "at least one of X(s)"), and expressions representing multiple X (e.g., "Xs," "more than one X(s)," "multiple X(s)," "a plurality of X(s)") may be interpreted as one another. These expressions may also be interpreted as one another with expressions that include specific wording (e.g., "pieces of," "amount of," etc., when X is an uncountable noun). For example, "a plurality of pieces of spatial relation information" may be interpreted as "a plurality of spatial relation information."

[0509] The above description of the disclosure is illustrative, and the present invention is not limited to the embodiments described herein. The disclosure can be implemented as modified and altered forms without departing from the spirit of the invention. The disclosure and its modifications and altered forms are included within the scope of the present invention and its equivalents.

Claims

1. A terminal comprising: a receiving unit that receives settings relating to one or more spatial domain (SD) vectors mapped to one or more layers; and a control unit that reports channel status information (CSI) of a domain different from the SD based on the one or more SD vectors.

2. The terminal according to claim 1, wherein the control unit reports at least one of the one or more SD vectors.

3. The terminal according to claim 1, wherein the receiving unit receives at least one of one of the settings relating to one or more frequency domain (FD) vectors and one or more settings relating to one or more Doppler domain (DD) vectors.

4. The terminal according to claim 1, wherein the one or more SD vectors have one or more indices corresponding to two or more dimensions.

5. A wireless communication method for a terminal, comprising the steps of: receiving a setting relating to one or more spatial domain (SD) vectors mapped to one or more layers; and reporting channel state information (CSI) of a domain different from the SD based on the one or more SD vectors.

6. A base station having a transmitting unit that transmits settings relating to one or more spatial domain (SD) vectors mapped to one or more layers, and a control unit that controls the reception of channel status information (CSI) of a domain different from the SD based on the one or more SD vectors.

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