Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives a configuration of a channel state information (CSI) report indicating a plurality of CSI-reference signal (RS) resources and a codebook type based on a type-2 codebook, the CSI report being used to perform reporting with respect to more than 32 first antenna ports or reporting of a plurality of CSI-RS resource indicators with respect to 32 or less second antenna ports; and a control unit that determines, on the basis of the configuration, the number of beams to be selected or the number of antenna ports to be selected, from among a part of candidate values for the number of beams to be selected or the number of antenna ports to be selected, in the type-2 codebook.

Description

Terminal, wireless communication method and base station

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

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

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) 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., NR), it is being considered that terminals (User Equipment (UE)) will control transmission and reception processing based on information regarding quasi-co-location (Quasi-Co-Location (QCL), Transmission Configuration Indication (TCI) state, beam).

[0006] However, the measurement / reporting of a large number of channel state information-reference signal (CSI-RS) resources for managing a large number of beams has not been sufficiently considered. If such measurement / reporting is not sufficiently considered, it may result in a decrease in communication quality / throughput, etc.

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

[0008] A terminal according to one aspect of the present disclosure includes a receiving unit that receives a channel state information (CSI) report configuration indicating a plurality of CSI-RS resources and a codebook type based on a Type 2 codebook for reporting for more than 32 first antenna ports or reporting a plurality of CSI-RS resource indicators for 32 or less second antenna ports, and a control unit that determines the number of beams to be selected or the number of antenna ports to be selected from a portion of candidate values ​​of the number of beams to be selected or the number of antenna ports to be selected in the Type 2 codebook based on the configuration.

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

[0010] FIG. 1 is a diagram illustrating an example of a CSI-RS location within a slot. FIG. 2 illustrates the association between the supported number of CSI-RS ports and a base station antenna layout for a single panel of the existing specifications. FIG. 3 illustrates the association between the supported number of CSI-RS ports and a base station antenna layout for a multi-panel of the existing specifications. FIG. 4 illustrates an example of multiple CSI-RS resources that are frequency-division multiplexed (FDM). FIG. 5 illustrates an example of multiple CSI-RS resources that are time-division multiplexed (TDM). FIG. 6 illustrates an example of a configuration according to Option 1 of embodiment AB1. FIG. 7 illustrates a first example of a configuration according to Option 2 of embodiment AB1. FIG. 8 illustrates a second example of a configuration according to Option 2 of embodiment AB1. FIGS. 9A and 9B illustrate an example of a base station antenna layout according to Option 2 of embodiment AB1. FIG. 10 illustrates a first example of a configuration according to Option 3 of embodiment AB1. FIG. 11 illustrates a second example of a configuration according to Option 3 of embodiment AB1. Figures 12A and 12B show an example of a base station antenna layout according to option 3 of embodiment AB1. Figures 13A and 13B show an example of a new (64,1) configuration for 128 ports according to embodiment AH1. Figures 14A to 14C show an example of a new (16,4) configuration for 128 ports according to embodiment AH1. Figure 15 shows an example of option 1-d of a new (16,4) configuration for 128 ports according to embodiment AH1. Figure 16 shows an example of option 2-a of a new (16,4) configuration for 128 ports according to embodiment AH1. Figure 17 shows an example of association candidates taking into account existing (N1,N2) of 32 ports according to option 1 of embodiment AH1. Figure 18 shows an example of association candidates taking into account existing (N1,N2) of 32 ports according to option 1 of embodiment AH2-1. Fig. 19 shows an example of association candidates that take into account 24 existing ports (N1, N2) in option 1 of embodiment AH2-2. Fig. 20 shows an example of association candidates that take into account 24 existing ports (N1, N2) in option 1 of embodiment AH3. Fig. 21 shows an example of association candidates that take into account 32 existing ports (N1, N2) in option 1 of embodiment AH4.FIG. 22 shows an example of association candidates considering 24 existing ports (N1, N2) in option 1 of embodiment AH5. FIG. 23 shows an example of association candidates for 32 ports for a multi-panel. FIG. 24 shows an example of multiple CSI-RS resources for a multi-panel. FIG. 25 shows an example of SD beam selection based on embodiment AB. FIG. 26 shows an example of SD beam selection according to embodiment AJ1. FIG. 27 shows an example of option A of embodiment AJ1. FIG. 28 shows an example of option B of embodiment AJ1. FIG. 29 shows an example of option C1 of embodiment AJ1. FIG. 30 shows an example of option C2 of embodiment AJ1. FIG. 31 shows an example of reporting multiple SD beams. FIG. 32 shows an example of option 2 of embodiment AK1. FIG. 33 shows an example of embodiment AK2. FIG. 34 shows an example of option 3 and option A of embodiment AK3. FIG. 35 shows an example of association according to embodiment AK0. FIG. 36 shows an example of a parameter combination in an extended type 2 CB. FIG. 37 shows an example of a parameter combination in an extended type 2 PSCB. FIG. 38 shows an example of a parameter combination in an additional extended type 2 PSCB. FIG. 39 shows an example of an SD beam group report. FIG. 40 shows an example of option 2a of embodiment AQ1. FIG. 41 shows an example of constraints on orthogonal SD basis vectors. FIG. 42 shows an example of assumptions regarding the number of ports, new (N1, N2), and (O1, O2) according to embodiment AW2. FIG. 43 shows an example of option 1-1 of embodiment AW2. FIG. 44 shows an example of option 1-2 of embodiment AW2. FIG. 45 shows an example of option 2-1 of embodiment AW2. FIG. 46 shows an example of option 2-2 of embodiment AW2. FIG. 47 shows an example of option 2-3 of embodiment AW2. FIG. 48 shows an example of assumptions regarding a variation of embodiment AW2. Fig. 49 shows an example of option 1-1 of a variation of embodiment AW2. Fig. 50 shows an example of option 1-2 of a variation of embodiment AW2. Fig. 51 shows an example of option 2-1 of a variation of embodiment AW2. Fig. 52 shows an example of option 2-2 of a variation of embodiment AW2.FIG. 53 shows an example of option 2-3 of a variation of embodiment AW2. FIG. 54 shows an example of table C1 of combination coefficients. FIG. 55 shows an example of table C2 of combination coefficients. FIG. 56 shows an example of table C3 of combination coefficients. FIG. 57 shows an example of combinations of the total number of CSI-RS ports P and (N1, N2). FIG. 58 shows a first part of an example of table C4 of combination coefficients. FIG. 59 shows a second part of an example of table C4 of combination coefficients. FIG. 60 shows a third part of an example of table C4 of combination coefficients. FIG. 61 shows an example of the number of bits required to indicate a combination. FIG. 62 shows a variation of embodiment CZ3. H and d v FIG. 63 shows an example of candidate values ​​for d according to embodiment CZ3. FIGs. 64A to 64C show a first example of group selection according to embodiment CZ4. FIG. 65 shows a second example of group selection according to embodiment CZ4. FIGs. 66A and 66B show an example of SD beam selection according to embodiment CZ4. FIGs. 67A and 67B show an example of port selection according to embodiment CZ4. FIG. 68 shows an example of the number of bits of combination coefficients according to embodiment CZ4. FIG. 69 shows an example of table C5 of combination coefficients. FIG. 70 shows a table C6 of d according to embodiment CZ5. H and d v FIG. 71 shows a relationship between multiple SD beams and multiple layers in Type 2CB. FIG. 72 shows a relationship between multiple SD beams and multiple layers according to embodiment DA1. FIG. 73 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 74 is a diagram showing an example of a configuration of a base station according to an embodiment. FIG. 75 is a diagram showing an example of a configuration of a user terminal according to an embodiment. FIG. 76 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. FIG. 77 is a diagram showing an example of a vehicle according to an embodiment.

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

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

[0013] The CSI-RS may include at least one of a non-zero power (NZP) CSI-RS and a CSI-Interference Management (CSI-Interference Measurement, CSI-IM). The SS / PBCH block is a block including an SS and a PBCH (and corresponding DMRS), and may be referred to as an SS block (SSB). The SS may include at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

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

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

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

[0017] For example, the report 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 reporting amount information may specify a combination of at least one of the above CSI parameters (for example, CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0034] (Codebook Configuration) The UE is configured with parameters (codebook configuration (CodebookConfig)) related to the codebook (CB) by higher layer signaling (RRC signaling). The codebook configuration is included in the CSI report configuration (CSI-ReportConfig) of the higher layer (RRC) parameters.

[0035] In the codebook setting, at least one codebook is selected from a plurality of codebooks including type 1 single panel (type I-Single Panel), type 1 multi-panel (type I-Multi Panel), type 2 (type II), and type 2 port selection (type II-Port Selection).

[0036] The codebook parameters include a parameter related to the codebook subset restriction (CBSR) ("...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. One bit in the CBSR bitmap corresponds to one codebook index / antenna port.

[0037] (CSI Reporting Configuration) The CSI reporting configuration (CSI-ReportConfig) of Rel. 16 includes a channel measurement resource (CMR), an interference measurement resource (IMR), etc. in addition to a codebook configuration (CodebookConfig). The IMR may be at least one of a zero power-interference measurement resource (ZP-IMR) and a non-zero power-interference measurement resource (NZP-IMR). Of the parameters of CSI-ReportConfig, parameters excluding codebookConfig-r16 are also included in the CSI reporting configuration of Rel. 15.

[0038] In the present disclosure, CMR, NZP CSI-RS resources, and resourcesForChannelMeasurement may be interchangeable. In the present disclosure, ZP-IMR, CSI-IM resources, and csi-IM-ResourcesForInterference may be interchangeable. In the present disclosure, NZP-IMR, NZP CSI-RS resources for interference measurement, and nzp-CSI-RS-ResourcesForInterference may be interchangeable.

[0039] Rel. 17 considers an extended CSI reporting configuration (CSI-ReportConfig) for CSI measurement / reporting of multi-TRP using NCJT. In this CSI reporting configuration, two CMR groups corresponding to two TRPs are configured. CMRs in a CMR group may be used for at least one of multi-TRP and single-TRP measurements using NCJT. N CMR pairs of NCJT are configured by RRC signaling. The UE may be configured by RRC signaling whether to use a CMR of a CMR pair for single-TRP measurements.

[0040] For CSI reporting related to multi-TRP / panel NCJT measurements configured by a single CSI reporting configuration, it is considered that at least one of the following options 1 and 2 will be supported.

[0041] <Option 1> The UE is configured to report X (X=0, 1, 2) CSIs related to single-TRP measurement hypotheses / hypotheses and one CSI related to NCJT measurements. If X=2, the two CSIs are related to two different single-TRP measurements using CMRs from different CMR groups.

[0042] <Option 2> The UE may be configured to report one CSI associated with the best measurement result among the measurement hypotheses for NCJT and single TRP.

[0043] As described above, in Rel. 15 / 16, the CBSR is configured per codebook configuration per CSI reporting configuration, i.e., the CBSR applies to all CMRs, etc. within the corresponding CSI reporting configuration.

[0044] However, in the CSI reporting configuration for multi-TRP in Rel. 17 with CSI reporting settings, if the above-mentioned options 1 and 2 are applied, the following measurement configurations may be made: ◆ Option 1 (X = 0): Measurement of NCJT CSI only. ◆ Option 1 (X = 1): Measurement of NCJT CSI and CSI of a single TRP (one TRP). ◆ Option 1 (X = 2): Measurement of NCJT CSI and CSI of a single TRP (two TRPs). ◆ Option 2: Measurement of both NCJT CSI and CSI of a single TRP.

[0045] The multiple subbands for a given CSI report #n as indicated by the upper layer parameter csi-ReportingBand may be numbered consecutively in ascending order, with the lowest subband of csi-ReportingBand as subband 0.

[0046] (PMI / Type 1 Codebook) Type 1 (type I) codebook (Rel. 15) specifies a type 1 single panel codebook and a type 1 multi-panel codebook for base station panels. In the type 1 single panel, the antenna model (antenna setting) of the CSI antenna port array (logical setting) is specified for (N1, N2). The number of CSI-RS antenna ports P CSI-RS In Type 1 multi-panel, the number of CSI-RS antenna ports P CSI-RS and (N g , N1, N2), an antenna model of the CSI antenna port array (logical configuration) is specified.

[0047] 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 interchanged. 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 interchanged. In the present disclosure, N1 and N2 may be interchanged, and the horizontal domain and the vertical domain may be interchanged.

[0048] In the present disclosure, an N1-by-N2 DFT vector, a spatial domain (SD) vector, a 2D-DFT vector, an SD DFT vector, an SD basis vector, an SD beam, and an SD basis may be interpreted interchangeably.

[0049] In the present disclosure, the terms port, antenna port, CSI-RS port, port index, and port number may be interchangeable.

[0050] In the present disclosure, (N1, N2), the two-dimensional number of antenna ports, the antenna configuration, and the base station antenna layout may be interchangeable. g The number of panels, the number of antenna groups, and the number of antenna port groups may be read interchangeably.

[0051] In the present disclosure, two polarizations, a first polarization and a second polarization, and a horizontal polarization and a vertical polarization may be interchangeable. In the present disclosure, one polarization, one of a first polarization and a second polarization, and one of a horizontal polarization and a vertical polarization may be interchangeable. In the present disclosure, co-phasing, phase difference, phase compensation between polarizations, and φ may be interchangeable.

[0052] In the present disclosure, the terms Type 1 codebook, Type 1 single-panel codebook, and Type 1 multi-panel codebook may be interpreted interchangeably.

[0053] (Type 1 Single Panel Codebook) For Rel. 15 Type 1 Single Panel CSI, the UE sets the codebook type upper layer parameter (subType in type1 in codebookType in CodebookConfig) to Type 1 Single Panel ('typeI-SinglePanel'). If the number of layers v is not {2,3,4}, the PMI value is calculated based on the three codebook indices i 1,1 ,i 1,2 , i2. When the number of layers v∈{2,3,4}, the PMI values ​​correspond to the four codebook indices i 1,1 ,i 1,2 ,i 1,3 , i2. If the number of layers v is not {2,3,4}, then the composite codebook index i1 = [i 1,1 i 1,2 ]. When the number of layers v∈{2,3,4}, the composite codebook index i1=[i 1,1 i 1,2 i 1,3 ].

[0054] P CSI-RS The supported (N1,N2) and (O1,O2) settings (combinations of values) are defined in the specification. (N1,N2) indicate the number of two-dimensional (2D) antenna elements and are set by the upper layer parameters n1-n2 in moreThanTwo in nrOfAntennaPorts in typeI-SinglePanel. n1-n2 are bitmap parameters with N1O1N2O2 bits. (O1,O2) are the 2D oversampling factors.

[0055] The precoding matrix for v=1 is W l,m,n (v) 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-RSThe precoding matrix for ≥ 16 and v = 3, 4 is W l,m,p,n (v) The precoding matrix for v=5,6 is W l,l',l'',m,m',m'',n (v) The precoding matrix for v=7,8 is Wl,l',l'',l''',m,m',m'',m''',n (v) l,l',l'',l''' are expressed as 1,1 and k1. m, m', m'', and m''' are determined by i 1,2 and k2. n is determined by i2. p is determined by P CSI-RS Of the (≧16) ports, the first half of the ports are 0 and the second half of the ports are 1.

[0056] The precoding matrix W can be expressed as the product of two matrices, W1W2, where W1 represents the wideband and long-term channel properties and the codebook index i1 (e.g., i 1,1 and i 1,2 ) is expressed by i 1,1 and i 1,2 and denote the beam selection in two dimensions, respectively. W2 denotes frequency selectivity (subband) and short-term channel characteristics and is represented by codebook index i2. i2 may denote the phase adjustment between the two polarizations. W1 may be given by the following equation E1 using matrix B:

[0057] B shows L 2D DFT beams, each oversampled by (O1, O2).

[0058] 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. i 1,3is mapped to k1 and k2 according to a table in the specification. For rank=2, 3, 4, the beams selected for different layers can be different when generating PMI.

[0059] The codebook for 1-layer CSI reporting and codebookMode=1 is index i corresponding to the horizontal component of the beam. 1,1 = l=0,1,...,N1O1-1 and the index i corresponding to the vertical component of the beam 1,2 = m = 0, 1, ..., N2O2-1 and indices i2 = n = 0, 1, 2, 3 corresponding to the subbands. Antenna ports 3000 to 2999+P CSI-RS Precoding matrix W for one-layer CSI reporting with l,m,n (1) is given by the following equation E2:

[0060] φ for the precoding matrix n , θ p , u m , v l,m , v ~ l,m is given by the following equation E3:

[0061] where [i 1,1 ,i 1,2 ,i2]=[l,m,n]. l,m is an N1-by-N2 DFT vector (SD basis vector, SD beam), expressed as exp(j2πln1 / O1N1) × exp(j2πmn2 / O2N2), n1 = 0, 1, ..., N1-1, n2 = 0, 1, ..., N2-1, and specified by v and l. l,m indicates one beam. The phase adjustment φ between the two polarizations n θ = exp(jπn / 2), which indicates the difference in phase of the second polarization relative to the phase of the first polarization. p indicates the phase of the second half port relative to the phase of the first half port.

[0062] (Type 1 Multi-Panel Codebook) For Rel. 15 Type 1 multi-panel CSI, the UE sets the codebook type upper layer parameter (subType in type1 in codebookType in CodebookConfig) to Type 1 multi-panel ('typeI-MultiPanel'). For Rel. 15 Type 1 multi-panel CSI, compared to Type 1 single-panel codebook, the number of panels N in addition to N1 and N2 is increased. g Compared with the Type 1 single-panel codebook, the (wideband) inter-panel co-phasing (phase compensation between panels) is set as i, 1,4 The same SD beam (DFT vector v l,m , SD basis indices l,m) are selected and only the inter-panel phase differences are added and reported.

[0063] P CSI-RS Supported (N g The settings (combination of values) of (N1,N2) and (O1,O2) are defined in the specification. (N1,N2) are set by ng-n1-n2 in typeI-MultiPanel. i 1,1 =l={0,1,...,N1O1-1} is the horizontal component 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 to -1 1,4,q =p={0,1,2,3} is the number of panels. i2=n={0,1,2,3} is the number of beams per panel.

[0064] The antenna configuration parameters for the Type 1 multi-panel codebook are ng-n1-n2 (N g , N1, N2). In the existing specifications, ranks up to 4 are supported, and ranks 5 and above are not supported.

[0065] Each PMI value corresponds to a codebook index i1, i2. v is the RI value (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 ].

[0066] When the codebook mode is set to 1, N g = 2, i 1,4 =i 1,4,1 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 the number of panels N g and codebook mode. N g Codebook mode 2 is supported only for [i 1,4,1 i 1,4,2 ] correspond to 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. N g = 2 and i in codebook mode 1 1,4 Only one value is reported, which represents the wideband retardation of the second panel (Panel 1) relative to the first panel (Panel 0).

[0067] When the codebook mode is set to 2, i2 = [i 2,0 i 2,1 i 2,2]. The number and value of i2 are related to the codebook mode and may be different from the Type 1 single panel codebook. If subband reporting is configured, i2 is the index for the subband. If wideband reporting is configured, i2 is the index for the wideband. In codebook mode 1, the number and value of i2 are the same as in the Type 1 single panel codebook, and i2 has one value for each subband. In codebook mode 2 (N g =2), the phase difference between the subbands has three values, representing the phase difference between the polarizations and between the panels.

[0068] Codebook mode 2 has a larger feedback overhead because it reports more phase differences for more accurate CSI. g Only supported for =2.

[0069] The Type-1 multi-panel codebook is based on the Type-1 single-panel codebook. In the Type-1 multi-panel codebook, the codebook for the first panel (Panel 0) follows the Type-1 single-panel codebook. The codebooks for the other panels apply the same precoder, with additional phase differences between the panels.

[0070] φ for the precoding matrix n , a p , b p , u m , v l,m is given by the following equation E4:

[0071] Antenna ports 3000 to 2999+P CSI-RS The precoding matrix for v-layer CSI reporting using (v) The number of panels in the i-th layer is N. g , the precoding matrix for codebook mode X is W l,m,p,n i,N_g,X It is expressed by [i 1,1 ,i 1,2 ,i 1,4,i2]=[l,m,p,n].

[0072] Codebook modes 1 and N g = {2, 4}, the precoding matrix W for 1-layer CSI reporting l,m,p,n (1) is W l,m,p,n 1,N_g,1 The codebook modes 1 and N are represented by g = {2,4}, the precoding matrix W for 2-layer CSI reporting 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) ] where 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:

[0073] where φ n =e jπn / 2 N g =2, p=p1, and N g For φ = 4, p = [p1, p2, p3]. p_1 , φ p_2 , φ p_3 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 φ p_1represents the phase difference of the second panel relative to the first panel. p_2 represents the phase difference of the third panel relative to the first panel. p_3 represents the phase difference of the fourth panel relative to the first panel.

[0074] Codebook modes 2 and N g = 2, the precoding matrix W for 1-layer CSI reporting l,m,p,n (1) is W l,m,p,n 1,2,1 The codebook modes 2 and N g = 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 ] where W l,m,p,n 1,2,2 and W l,m,p,n 2,2,2 is given by the following equation E6:

[0075] 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 has the same v l,m p = [p1 p1] and n = [n0, n1, n2]. p_1 represents the phase difference of the second panel (panel 1) relative to the first panel (panel 0) in the first polarization. p_2 represents the phase difference of the second panel (panel 1) relative to the first panel (panel 0) in the second polarization. n_0 represents the phase difference of the second polarization of the first panel relative to the first polarization of the first panel for each subband. n_1 represents the phase difference of the first polarization of the second panel relative to the first polarization of the first panel for each subband. n_2 represents the phase difference of the second polarization of the second panel relative to the first polarization of the first panel for each subband.

[0076] (PMI / Type 2 Codebook) In the present disclosure, the terms Type 2 (type II) codebook, extended Type 2 codebook, Type 2 port selection (PS) codebook, extended Type 2 PS codebook, additional extended Type 2 port PS codebook, codebook for CJT, and codebook for Doppler may be interpreted interchangeably.

[0077] (Type II Codebook) For a type II codebook (Rel. 15, type II CSI), the UE is configured with the upper layer parameter codebookType set to 'type II'.

[0078] In this disclosure, a matrix Z with X rows and Y columns may be expressed as Z(X×Y).

[0079] In Rel. 15 Type 2 CSI, for a given layer l, the subband-wise (SB-wise) precoding matrix is ​​based on the following equation F1: l (N t ×N3) = W1W 2,l (F1)

[0080] N t is the number of antennas / antenna ports. N3 is the total number of precoding (beamforming) matrices (precoders) indicated by the PMI (number of subbands).

[0081] W1(N t ×2L) are 2L DFT vectors (oversampled DFT vectors) and indicate 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 respectively b i ,b j It may also be expressed as:

[0082] W 2,l(2L×N3) is a matrix (LC coefficient matrix) consisting of linear combination coefficients (subband complex LC coefficients, coupling coefficients) for layer l. 2,l represents the beam selection and the co-phasing between the two polarizations. For example, for L=2 SD beams b i ,b j The LC coefficients corresponding to 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 The feedback overhead is mainly due to the LC coefficient matrix W 2,l Also, Type 2 CSI in Rel. 15 only supports ranks 1 and 2.

[0083] In Type-2 CSI, the channel (channel matrix) for a user is represented by a linear combination of two polarizations and L SD beams. Type-2 CSI in Rel. 15 supports ranks 1 and 2.

[0084] The value of L is set using the upper layer parameter numberOfBeams.

[0085] The L vectors combined by the codebook are 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) isx C y , 0 for x<y.

[0086] ((Enhanced Type 2 Codebook (Rel. 16))) For Rel. 16 Type 2 CSI (enhanced Type 2 codebook), the UE is configured with the upper layer parameter codebookType set to 'typeII-r16'.

[0087] Type 2 CSI in Rel. 16 uses frequency domain (FD) compression to compress the LC coefficient matrix W 2,l Rel. 16 Type 2 CSI supports ranks 3 and 4 in addition to ranks 1 and 2.

[0088] In Rel. 16 Type 2 CSI, the precoding matrix W for a given layer l is l is expressed by the following formula F2: l = W1W ~ l W f,l H (F2)

[0089] W in Type 2 CSI of Rel. 15 2,l is W ~ l W f,l H It is approximated by the matrix W ~ may be expressed by adding ~ to the W. ~ l is W ~ 2,l It can also be expressed as W f,l H is W f,l is the adjoint matrix of W f,l is obtained by the conjugate transpose of

[0090] For CSI reporting, the UE may be configured with one of two subband sizes: N PRB SBThe number of PMI subbands per CQI subband, R, is defined as consecutive PRBs and may depend on the total number of PRBs in the BWP. The number of PMI subbands per CQI subband, R, is configured by the RRC IE (numberOfPMI-SubbandsPerCQI-Subband). R controls the total number of precoding matrices, N3, represented by the PMI, as a function of the number of subbands configured in the csi-ReportingBand, the subband size configured by subbandSize, and the total number of PRBs in the BWP.

[0091] W1(N t ×2L) denotes the 2L DFT vectors. To represent this matrix, the indices of the SD basis and the two-dimensional over-sampling factor are reported.

[0092] W ~ l (2L×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 indicating the NZC positions and the quantized NZCs.

[0093] W f,l (N3×M v ) for layer l, M v DFT vectors (frequency domain (FD) DFT vector, FD basis vector, FD beam) indicate the selected frequency domain basis. Each DFT vector uses N3 FD bases (subbands). N3 is the total number (number of subbands) of precoding (beamforming) matrices (precoders) indicated by the PMI as a function of the number of subbands configured in the csi-ReportingBand. The csi-ReportingBand indicates contiguous or discontiguous subbands within a BWP when CSI for that BWP is reported. M vIf N3 > 19, there are M FD DFT vectors from the intermediate subset (InS) of size N3' (<N3). v FD DFT vectors (FD basis) are selected. If N3≦19, log2(C(N3−1,M v -1)) bits are reported, where C(N3-1,M v -1) is N3-1 to M v -Represents the number of combinations in which one can be selected (combinatorial coefficient), and is also called the binomial coefficient.

[0094] The frequency domain response / distribution (frequency response) represented by the linear combination of the FD DFT vector and the LC coefficients may be called an FD beam, which may correspond to a delay profile (time response).

[0095] The PMI subband size is given by 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 for a given rank v is M. v is ceil(p v ×N3 / R) The number of FD DFT vectors M v is the same for all layers l∈{1,2,3,4}. v is set by higher layers.

[0096] The multiple precoding matrix indicated by the PMI is L+M v is determined from vectors.

[0097] The L SD beams (SD DFT vectors) vm_1^(i), m_2^(i) for beam index i=0,1,...,L-1 are identified by q1, q2, n1, n2, and i 1,1 , i 1,2 is shown by

[0098] M v The FD DFT vectors are initial ∈{-2M v +1,-2Mv +2,...,0}, n 3,l =[n 3,l (0) ,...,n 3,l (M_v-1) ], n 3,l (f) ∈{0,1,...,N3-1}.

[0099] In the FD DFT vector, the elements (FD basis) for the FD basis (subband) index t=0,1,...,N3-1 and layer l=1,...,v are y t,l (f) =exp(j2πtn 3,l (f) / N3). M of FD DFT vector v indices f=0,1,...,M v M to -1 v The FD DFT vectors are 0,l (f) ,y 1,l (f) ,...,y N_3-1,l (f) ] T is.

[0100] W 2,l Each row of represents the channel frequency response of a particular SD beam. If the SD beam has high directivity, the channel taps per beam are limited (the power delay profile is sparse in the time domain). As a result, the channel frequency response per SD beam is highly correlated (approaching flat in the frequency domain). In this case, the channel frequency response can be approximated by a linear combination of a small number of FD DFT vectors. For example, M v = 2, the FD DFT vector f2,f q and LC coefficient d1 0 ,d2 0 and the frequency response associated with the SD beam b0 is given by d1 0 f2+,d2 0 f q is approximated by

[0101] Dominant M vM FD DFT vectors are selected. v <<By setting it to N3, W ~ l The overhead of W 2,l The overhead is much smaller than that of M v All or some of the FD DFT vectors are used to approximate the frequency response of each SD beam. A bitmap is used to report only the selected FD DFT vectors for each SD beam. If no bitmap is reported, all FD DFT vectors are selected for each SD beam. In this case, the NZCs of all FD DFT vectors are reported for each SD beam. The number of NZCs in a layer, K l NZ ≦K0=ceil(β×2LM v ) and the NZC number K across all layers NZ ≦2K0=ceil(β×2LM v ) where β is set by higher layers.

[0102] In the extended type 2 codebook, L, β, p v The combination of values ​​(parameter combination) is determined by the upper layer parameter paramCombination-r16 (parameter combination setting). L is the number of SD beams. v is the number of FD basis vectors for rank v, M v =ceil(p v × N3 / R). β is a parameter for calculating the maximum number of NZCs.

[0103] In the present disclosure, the terms codebook parameter combination, codebook parameter combination, parameter combination, and parameter combination setting may be read interchangeably.

[0104] Type 2 CSI feedback on PUSCH in Rel. 16 includes 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, which determines the size of CSI Part 2. The base station knows the size of CSI Part 2 after receiving CSI Part 1.

[0105] In Rel. 16 Enhanced Type 2 CSI feedback, CSI Part 1 includes the RI (if reported), the CQI, and an indicator of the total number of non-zero amplitude coefficients across layers for Enhanced Type 2 CSI. The fields in Part 1, RI (if reported), CQI, and the indicator of the total number of non-zero amplitude coefficients across layers, are coded separately. CSI Part 2 includes the PMI for Enhanced Type 2 CSI. Parts 1 and 2 are coded separately. CSI Part 2 (PMI) includes the oversampling factor, the index of the SD basis corresponding to each SD beam, and the index M of the initial FD DFT vector (start offset) for the selected DFT window. initial and at least one of the selected FD basis for each layer, NZC (amplitude and phase) for each layer, strongest coefficient indicator (SCI) for each layer, and amplitude of the strongest coefficient for each layer / polarization.

[0106] The multiple PMI indices (PMI values, codebook indices) associated with different CSI part 2 information are expressed 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 1,6,1i 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)

[0107] 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 indices of the SD basis corresponding to each SD beam. i 1,2 ∈{0,1,...,C(N1N2,L)-1}. L beam groups are selected from N1N2 (SD) beam groups, and i 1,2 Reported / displayed by i 1,5 : Codebook indicator. The index of the FD basis 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, then 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 : Bitmap indicator for the lth layer. The non-zero bits in the bitmap are i 2,4,l and i 2,5,l Identifies which coefficients in are 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 : The strongest coefficient indicator for the lth layer (the largest element k in the amplitude coefficient indicator) l,i,f (2) ).i 1,8,l The strongest coefficients in 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) -1, and 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 (wideband) coefficients of the lth layer. 2,3,l =[k l,0 (1) k l,1 (1) ]. ◆i 2,4,l : The amplitude coefficient indicator of the reported (subband) coefficient of the lth layer. 2,4,l =[k l,0 (2) ...kl,M_v-1 (2) ]. ◆i 2,5,l : Phase coefficient indicator of the reported (subband) coefficient of the lth layer. 2,5,l =[c l,0,f ...c l,M_v-1,f ].

[0108] f l * ∈{0,1,...,M v -1}, i 2,4,l Let i be the index of l * ∈{0,1,...,2L-1} is k l,f_l^* (2) Let f be the index of l * and i l * is the strongest coefficient for layer l=1,...,v, i.e., for layer l 2,4,l Elements kl,i_l^*,f_l^* (2) Identify the codebook index n 3,l is n 3,l (f_l^*) Regarding 3,l (f) =(n 3,l (f) -n 3,l (f_l^*) ) mod N3 and remapped to n 3,l (f_l^*) = 0. The index f is f l * Regarding f=(ff l * ) mod M v and after remapping, l * = 0 (l = 1,...,v). 2,4,l , i 2,5,l , and i 1,7,l indicates the amplitude coefficient, phase coefficient, and bitmap after remapping, respectively.

[0109] W ~ lEach reported LC coefficient (complex coefficient) in is a separately quantized amplitude and phase. ◆ Amplitude quantization Polarization-specific reference amplitudes are calculated from the table (amplitude coefficient indicator i 2,3,l Mapping of elements in: Amplitude coefficient indicator element k l,p (1) to amplitude coefficient p l,p (1) This table uses 16-level quantization with a 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) ∈{0,...,15}. All other coefficients are quantized according to the table defined in the specification (amplitude coefficient indicator i 2,4,l Mapping of elements in: Amplitude coefficient indicator element k l,i,f (2) to amplitude coefficient p l,i,f (2) This table uses 8-level quantization with a mapping to p l (2) =[p l,0 (2) ...p l,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) ∈{0,...,7}. ◆Phase quantization Amplitude coefficient indicator i 2,5,l Elements in (amplitude coefficient indicator elements) [c l,0 ...c l,M_v-1] is reported by the UE (using 4 bits). All phase coefficients are quantized using 16-PSK. The quantity φ for the phase difference l,i,f = exp(j2πc l,i,f / 16) is the phase coefficient c l,f =[c l,0,f ...c l,2L-1.f ], c l,i,fi ∈{0,...,15}.

[0110] 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.

[0111] i 1,5 and i 1,6,l is the PMI index for FD-based reporting. Only if N3>19, i 1,5 is reported.

[0112] 3000 to 2999+P CSI-RS The precoding matrix W is represented by the codebook for v (=1 to 4) layer CSI reporting using (v) is the precoding matrix W for layer l (= 1 to v) l Based on the precoding matrix W l is expressed by the following formula F3.

[0113] where beam index i=0,1,...,L-1, m1 (i) =O1n1 (i) +q1, m2 (i) =O2n2 (i) +q2, n1 (i) ∈{0,1,...,N1-1}, n2(i) n1 ∈{0,1,...,N2-1}. (i) , n2 (i) is the SD basis for representing the SD beam i. vm_1^(i),m_2^(i) are DFT vectors representing the SD beams. p l,0 (1) denotes the wideband amplitude coefficient. l,i,f (2) denotes the subband amplitude coefficient. l,i,f denotes a phase coefficient. Thus, the codebook for each layer includes the strongest coefficient for each polarization, the amplitude coefficient for each polarization, the FD beam, and the SD beam, and the phase coefficient for each polarization, the FD beam, and the SD beam.

[0114] For CSI Part 2 grouping, for a given CSI report, the PMI information is grouped into three groups (groups 0 to 2). This is important when CSI omission is performed. Index i 2,4,l , i 2,5,l , i 1,7,l Each reported element of is associated with a specific priority rule. Groups 0 to 2 follow the following: ◆ Group 0: Index i 1,1 , i 1,2 , i 1,8,l (l=1,...,v) ◆Group 1: Index i (if reported) 1,5 , index i (if reported) 1,6,l , i 1,7,l The highest (top) v2LM v -floor(K NZ / 2) priority elements, i 2,3,l , i 2,4,l The highest (upper) ceil(K NZ / 2)-v priority elements, i 2,5,l The highest (upper) ceil(K NZ / 2)-v priority elements (l=1,...,v) ◆Group 2: i 1,7,l The lowest (lowest) floor(K NZ / 2) priority elements, i 2,4,l The lowest (lowest) floor(K NZ / 2) priority elements, i 2,5,l The lowest (lowest) floor(K NZ / 2) priority elements (l=1,...,v)

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

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

[0117] In Rel. 15's Type 2 port selection CSI, the UE does not need to derive an SD beam by considering an SD DFT vector as in Type 2 CSI. The base station transmits CSI-RS using K CSI-RS ports beamformed by considering a 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's Type 2 PS CSI supports ranks 1 and 2.

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

[0119] For each polarization, L antenna ports are 1,1 Selected by i 1,1 ∈{0,1,...,ceil(P CSI-RS / (2d))-1}.

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

[0121] The operation of Rel. 16 Type 2 PS CSI is similar to Rel. 16 Type 2 CSI except for SD beam selection. Rel. 15 Type 2 PS CSI supports ranks 1 to 4.

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

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

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

[0125] The extended type 2 PS CSI increases the number of FD basis vectors from N3 to M in the same way as the type 2 CSI of Rel. 16. v By reducing it to (M v <<N3>>, which reduces overhead compared to Rel. 15 Type 2 PS CSI.

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

[0127] For the Rel. 17 Type 2 PS CSI / codebook (further enhanced Type 2 PS codebook), the UE configures the upper layer parameter codebookType set to 'typeII-PortSelection-r17'.

[0128] In Type 2 PS CSI of Rel. 17, each CSI-RS port #i transmits an SD-FD beam pair (SD beam b i and FD beam f i,j 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 at the UE based on an SD beam-FD beam pair can be reduced to less than the frequency selectivity of the channel frequency response observed at the UE based on an SD beam by delay pre-compensation.

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

[0131] In the supplemental enhanced type 2 PS codebook, the values ​​of α, M, and β (codebook parameter combination, parameter combination) are determined by the upper layer parameter paramCombination-r17 (codebook parameter setting). In the parameter combination α, M, and β for the supplemental enhanced type 2 PS codebook in Rel. 17, α is the number of selected CSI-RS ports in the PS codebook, K1 = αP CSI-RS is a parameter for calculating the maximum number of NZCs. M is the number of FD basis vectors. β is a parameter for calculating the maximum number of NZCs.

[0132] The precoding matrix indicated by the PMI is determined from L+M vectors, where L=K1 / 2 and K1=αP CSI-RS is.

[0133] L vectors v m^(i) (i=0,1,...,L-1) based on P CSI-RS K1 ports are selected from the vector v m^(i) is m=[m (0) ... [m (L-1) ], m (i) ∈{0,1,...,P CSI-RS / 2-1}. (i) is the index i 1,2∈{0,1,...,C(P CSI-RS / 2,L)-1}.

[0134] In the additional enhanced Type 2PS CSI of Rel. 17, each CSI-RS port is beamformed using an SD beam and an FD beam, and each port is associated with an SD-FD beam pair.

[0135] Precoding matrix W for a given layer l l is expressed by the following formula F5: l (K×N3) = W1W ~ l W f,l H (F5)

[0136] 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 the index of the selected port to the base station as part of the PMI. Note that in Rel. 16, each port is associated with an SD beam.

[0137] W ~ l (2L×M v ) is a matrix of combining coefficients (subband complex LC coefficients). Up to K0 NZCs are reported. The report consists of two parts: a bitmap indicating the NZC positions and the quantized NZCs.

[0138] In the additional extension type 2PS CSI of Rel. 17, 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 lNZ ≦2K0 is the total number of non-zero coefficients. If v≦2 and K NZ =K1Mv, i for layers l=1,...,v 1,7,l (Bitmap indicator for the lth layer) is not reported. That is, if the total number of reported NZCs is equal to the maximum number of K1Mv and v≦2, reporting of the bitmap indicating the position of NZCs is omitted. Note that in Rel. 16, the NZC position bitmap is always reported.

[0139] W f,l (N3×M v ) is M for each layer. v (M v = 1 or 2) FD basis vectors. Each vector contains N3 FD bases (FD-DFT bases). The base station f,l You can also erase. M v If W = 1, f,l is off and no additional FD basis vectors are reported. v If W = 2, f,l is on and M v additional FD basis vectors are reported. v = 2, the window size N ∈ {2, 4} of the FD basis is set by the upper layer parameter (valueOfN). f,l is always reported.

[0140] (JT) Joint transmission (JT) may refer to simultaneous data transmission from multiple points (eg, TRPs) to a single UE.

[0141] Rel. 17 supports non-coherent joint transmission (NCJT) from two TRPs. The PDSCHs from the two TRPs may be independently precoded and independently decoded. The frequency resources may be non-overlapping, partially overlapping, or fully overlapping. When overlap occurs, the PDSCH from one TRP will interfere with the PDSCH from the other TRP.

[0142] Rel. 18 is considering supporting coherent joint transmission (CJT, mTRP CJT) using up to four TRPs. Data from the four TRPs may be coherently precoded and transmitted to the UE on the same time-frequency resource. For example, the same precoding matrix may be used to consider channels from the four TRPs. "Coherent" may mean that there is a fixed relationship between the phases of multiple received signals. Using four-TRP joint precoding, signal quality may be improved and there may be no interference between the four TRPs. Data may only be subject to interference outside the four TRPs.

[0143] (NCJT CSI / Type 1 Codebook) In Rel. 17, the applicable scenario for NCJT CSI reporting is a single DCI-based MTRP NCJT with a Type 1 single-panel codebook. For NCJT CSI measurement, two channel measurement resource (CMR) groups, each with a CMR from one TRP, can be configured within a single CSI-ReportConfig. One CSI reporting mode can be configured from two modes:

[0144] Through RRC signaling, the CSI-ReportConfig for Rel. 17 non-coherent joint transmission (NCJT) CSI configures the CMR and the CSI reporting mode (csi-ReportMode).

[0145] K s Two CMR groups with K = K1 + K2 CMRs are configured in the UE. s ≦8. K s The CMRs correspond to NZP-CSI-RS resource sets for channel measurement. K1 and K2 are the numbers of CMRs in the two CMR groups, respectively. N (N sets) CMR pairs (resource pairs) are configured by higher layers by selecting from all possible pairs. N=1, K s =2 is supported. max Support for K = 2 is an optional feature for the UE. S,max =X support is an optional feature for the UE. Each CMR can contain up to 32 CSI-RS ports, depending on the UE capabilities. Each CMR pair is associated with one CRI value.

[0146] The bitmap signaled by RRC indicates N (N=1, 2) CMR pairs actually used for NCJT measurement by indicating one CMR from each CMR group. The UE measures single-TRP CSI for TRP1 and single-TRP CSI for TRP2 using CMRs in the two CMR groups, and measures NCJT CSI using N CMR pairs.

[0147] The UE selects one or more CSIs to report based on the mode (CSI reporting mode) configured by csi-ReportMode. csi-ReportMode indicates one of the following two modes (NCJT CSI modes): Mode 1 and Mode 2. ◆ Mode 1 The UE may be configured to report X CSIs associated with single-TRP measurement hypotheses and one CSI associated with the NCJT measurement hypothesis. X = 0, 1, 2. If X = 2, two CSIs are associated with two different single-TRP measurement hypotheses with multiple CMRs from different CMR groups. Support for X = 1, 2 is an optional UE feature for UEs that support Option 1. ◆ Mode 2 The UE is configured to report one CSI associated with the best one of the NCJT and single-TRP measurement hypotheses.

[0148] 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.

[0149] Within one CSI report, up to two single-TRP CSIs and one NCJT CSI can be reported (mode 1 with X=2). The NCJT CSI includes one CRI, two RIs (with one joint RI index), two PMIs, two LIs, and one CQI (up to four layers). The single-TRP CSI is the same as the existing CSI, and includes one CRI, one RI / PMI / LI, and one or two CQIs (up to eight layers, one CQI per CW).

[0150] New mapping orders (tables) of multiple fields within one CSI report are defined for some of the following cases: ◆ Wideband CSI mapping order for mode 1 with X=0. Wideband CSI is supported only for mode 1 with X=0, i.e., NCJT CSI. ◆ CSI Part 1 mapping order for modes 1 and 2. ◆ CSI Part 2 wideband mapping order for modes 1 and 2. ◆ CSI Part 2 subband mapping order for modes 1 and 2.

[0151] (CJT CSI / Type-2 Codebook) In the ideal case (where four TRPs are co-located), a joint estimation of the aggregated channel matrix H can be performed, and a joint precoding matrix V can be fed back. However, the large-scale path losses of the four paths can vary significantly. A joint precoding matrix V based on a constant module codebook is not accurate. In this case, the feedback per TRP and inter-TRP coefficients can be matched by the current NR Type-2 codebook.

[0152] For a CJT of up to four TRPs in FR1, the selection of the four TRPs may be semi-static. Therefore, the selection and configuration of the four CMRs (four CSI-RS resources) for channel measurement may also be semi-static. Dynamic indication of the four TRPs from a list of CSI-RS resources is also possible, but unlikely.

[0153] The path losses from the four TRPs to the UE are different, which makes it difficult to simply report one aggregated CSI that represents the joint channel matrix.

[0154] Considering fallback operation to NCJT (i.e., single TRP), CSI per TRP (i.e., single TRP CSI like NCJT CSI in Rel. 17) is also considered.

[0155] Assuming an ideal backhaul, synchronization, and the same number of antenna ports across multiple TRPs, CSI acquisition for coherent joint transmission (CJT) for FR1 and up to four TRPs is considered. For CJT multi-TRP for FDD, an extended (Rel. 16) Type 2 codebook and an additional extended (Rel. 17) Type 2 PS codebook are considered.

[0156] W1 (matrix representing SD DFT vector) / W for each TRP f (the matrix representing the FD DFT vector) may be the same or different. l (NZC) may be different. W1 / W for each TRP f / W l may be selected jointly or individually. W1 / W f / W l Different scenarios with different options are preferable for the design of W. φ may be reported as separate items or l These used policies relate to deployment scenarios (e.g., intra-site multi-TRP or inter-site multi-TRP).

[0157] For example, the precoding matrix for a 4-TRP CJT CSI (codebook) is W1 / W f / W l The W1 for each TRP may be the same or different, selected jointly or individually. l may be different and may be selected jointly or individually. fmay be the same or different, and may be jointly or individually selected.

[0158] There are two codebook mode settings for FD basis selection. In mode 1, we denote the FD basis offset for the j-th selected CSI-RS resource for j=2,...,N by i 1,9 In Mode 2, i 1,9 No reporting is required. All CSI-RS resources have the same FD basis selection.

[0159] ◆Mode 1 is SD / FD basis selection per TRP / TRP group. It allows independent FD basis selection across N TRPs / TRP groups. For example, its codebook structure is given by the following formula G1, where N is the number of TRPs or TRP groups.

[0160] ◆Mode 2 is SD basis selection per TRP / TRP group (port group or resource) and joint / common FD basis selection (across N TRPs / TRP groups). For example, its codebook structure is given by the following formula G2, where N is the number of TRPs or TRP groups.

[0161] In these two modes, detailed designs such as parameter combination, basis selection, TRP (group) selection, reference amplitude, and W2 quantization method may be shared.

[0162] For the enhanced Type II codebook for CJT (Type 2 CSI for CJT in Rel. 18), the UE may configure the higher layer parameter codebookType set to 'typeII-CJT-r18'. For the further enhanced Type II port selection codebook for CJT (Type 2 PS CSI for CJT in Rel. 18), the UE may configure the higher layer parameter codebookType set to 'typeII-CJT-PortSelection-r18'.

[0163] The UE uses N TRP ∈{1,2,3,4} CSI-RS resources can be configured.

[0164] In the extended type 2 codebook for CJT, the upper layer parameter paramCombination-CJT-L-r18 determines {L1,...,L N_TRP} value of N L A set of ∈{1,2,4} combinations is set. N L The value of is set by the higher layer parameter numberOfSDCombinations.

[0165] In the CJT additional extended type 2 PS codebook, the upper layer parameter paramCombination-CJT-PS-alpha-r18 determines {α1,...,α N_TRP} value of N L A set of ∈{1,2,4} combinations is set. N L The value of is set by the higher layer parameter numberOfSDCombinations-PS.

[0166] The UE may configure the upper layer parameter restrictedCMR-Selection. If restrictedCMR-Selection is configured, the number of selected CSI-RS resources N is NTRP Otherwise, the UE TRP , we expect to select N CSI-RS resources, and the selection is TRP The value is reported using a bitmap of bits.

[0167] In selecting / reporting an SD beam, selection / reporting of an SD beam per CSI-RS resource is applied.

[0168] In the extended type 2 codebook for CJT, the precoding matrix indicated by PMI is Σ j=1 N L σ_j +M v vectors, where {σ1,...,σ N} is 1≦σ1<…<σ N ≦N TRP are the indices of the N CSI-RS resources selected in ascending order so that TRP may be the number of CSI-RS resources configured for CSI reporting, or may be the number of TRPs for CJT. σ_1 ,...,L σ_N} is {L1,...,L N_TRP} is the corresponding value from the selected combination.

[0169] j=1,...,N, i=0,1,...,L σ_j −1, L corresponding to the j-th selected CSI-RS resource σ_j The vectors vm_1,f^(i),m_2,f^(i) are 1,1 , i 1,2 It is displayed / reported by, where i 1,1 , i 1,2 is given by the following equation G3: 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)

[0170] In the additional extended type 2PS codebook for CJT, the precoding matrix indicated by PMI is Σ j=1 N L σ_j +M vectors, where {σ1,...,σ N} is 1≦σ1<…<σ N ≦N TRP are the indices of the N CSI-RS resources selected in ascending order so that L σ_j =K 1,σ_j / 2, K 1,σ_j =α σ_j *P CSI-RS {α σ_1 ,...,α σ_N} is {α1,...,α N_TRP} is the corresponding value from the selected combination.

[0171] j=1,...,N, i=0,1,...,L σ_j -1, L σ_j vectors v m_j^(i) Based on this, P of the j-th selected CSI-RS resource is CSI-RS From the ports, K 1,σ_j ports are selected and i 1,2 It is displayed / reported by, where i 1,2 is given by the following equation G4: 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)

[0172] In the present disclosure, the CJT codebook, the CJT type 2 codebook, the CJT extended type 2 codebook, the Rel. 18 CJT type 2 codebook, type II-CJT-r18, the CJT supplemented extended type 2 PS codebook, the Rel. 18 CJT type 2 PS codebook, and type II-CJT-PortSelection-r18′ may be read interchangeably.

[0173] (Doppler CSI / Type-2 Codebook) It is being considered to extend / improve CSI reporting for UEs moving at high / medium speeds 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 and frequency domain basis, and to report from the UE the time-domain channel characteristics (time-domain correlation profile) measured via the tracking CSI-RS (TRS).

[0174] The channel coherent time (CCT) depends on the maximum Doppler shift. The channel coherent time is the time during which the measured channel characteristics are available or until the measured channel characteristics become unavailable (channel aging). The maximum Doppler shift is estimated by the relative velocity between the transmitter and receiver. The channel coherent time T c is 1 / Δf max where Δf max = v / λ. As the UE's moving speed increases, the channel coherence time decreases. For example, at a carrier frequency of 4.5 GHz, when the moving speed exceeds approximately 25 km / h, the channel coherence time decreases to less than 10 ms. The problem is how to deal with such high moving speeds and short channel coherence times.

[0175] 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 10 ms or more. ◆ CSI reporting for TRS is not assumed. There is no reporting configuration for P-TRS. Reporting can be configured, but the report quantity (reportQuantity) can only be set to 'none'. A maximum of 16 CSI-RS resources can be used per CSI-RS resource set.

[0176] The TRS is allocated to resources in the time domain and frequency domain. To measure the effect of Doppler shift, multiple RSs in the time domain are required within a specific frequency domain resource.

[0177] The CMR can be used to measure the effect of Doppler shift, but the RS used for the measurement depends on the UE implementation.

[0178] The amount of CSI reporting does not support information about Doppler shift. Through the CSI codebook (PMI), the UE reports information for determining W = W1W2, where W1 is the wideband characteristic and indicates the spatial beam, and W2 is the subband characteristic and indicates the amplitude / phase coefficient for each spatial beam.

[0179] Regarding measurements related to Doppler shift, there are possible cases: Case 1 in which the UE performs measurements based on CSI-RS, and Case 2 in which the base station performs measurements based on SRS. Regarding determination of the influence of Doppler shift, there are possible cases: Case 1-1 in which the UE performs determination based on CSI-RS measurement results, Case 1-2 in which the base station performs determination based on CSI-RS measurement results reported by the UE, and Case 2-1 in which the base station performs determination based on SRS measurement results.

[0180] A CSI-RS measurement window and a CSI reporting window are 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.

[0181] Assuming that the CSI is reported in slot n, the length of the basis vectors (DFT basis vectors) in the Doppler domain (DD) / time domain (TD) (the number of DD / TD bases) may be N4. meas Within a CSI measurement window of W −1, one or more CSI occasions for calculation of a CSI report may be measured, where k may be a slot index and W meas may be the measurement window length (number of slots). The CSI occasion may be configured in the CSI-ReportConfig. Slot [l,l+W CSI −1] may be associated with a CSI report in slot n, where l may be a slot index and W CSI may be the reporting window length (number of slots). ref It may also be expressed as:

[0182] CSI reporting window duration W CSI = dN4, where d and N4 are determined by the CMR setting. The start of the CSI reporting window is slot l. l = (nN CSI,ref ) may be used. l=(n+δ) may be used. δ={0,2} may be used, or δ={0,1,2} may be used.

[0183] A d-slot may be of duration in DD units.

[0184] When UE-side prediction is assumed, the UE is supported to predict the CSI / channel after slot l, and the position of slot l (from multiple candidate values) is configured by the base station via higher layer signaling. The multiple candidates for the slot l position are determined based on the existing CSI reference resource position (nNCSI,ref ) and (n+δ), where δ>0. The existing CSI reference resource in the existing operation, i.e., (nN CSI,ref ) is reused / repurposed to indicate the position of the last CSI-RS occasion used for CSI reporting.

[0185] For the parameter δ, an additional value of 2 is supported.

[0186] N4 is set by the base station via an upper layer parameter N4.

[0187] When N4=1, the DD basis may be the identity. There may be no DD compression. In this case, the codebook structure may be, for example, the following formula H1:

[0188] For N4>1, the Doppler domain orthogonal DFT basis may be commonly selected for all SD / FD basis sets. In this case, the codebook structure may be, for example, the following formula H2:

[0189] Only Q>1, which indicates the number of selected Doppler domain (DD) basis vectors, is allowed. The detailed design of the SD / FD basis with associated UCI parameters follows existing specifications.

[0190] For an enhanced Type II codebook for predicted PMI (Rel. 18 Type 2 CSI for predicted PMI), the UE may configure the higher layer parameter codebookType set to 'typeII-Doppler-r18'. For a further enhanced Type II port selection codebook for predicted PMI (Rel. 18 Type 2 PS CSI for predicted PMI), the UE may configure the higher layer parameter codebookType set to 'typeII-Doppler-PortSelection-r18'.

[0191] In the present disclosure, the Doppler codebook, the Doppler type 2 codebook, the extended type 2 codebook for predicted PMI, the Rel. 18 type 2 CSI codebook for predicted PMI, type II-Doppler-r18, the additional extended type 2 PS codebook for predicted PMI, the Rel. 18 type 2 PS codebook for predicted PMI, and type II-Doppler-PortSelection-r18 may be interpreted as interchangeable.

[0192] (TDCP Reporting) Reporting of time domain channel properties (TDCP) from the UE is under consideration.

[0193] The report quantity (upper layer parameter reportQuantity) is set to 'tdcp', the upper layer parameter Y ≥ 1, and the delays {D1,...,D Y}, and for the CSI-ReportConfig with TDCP =[k1 ... k Y ] is reported, where k i ∈{0,...,15}. For i=1,...,Y, the corresponding amplitude value is 1-a i It is obtained from k i From a i The mapping to is defined in the specification.

[0194] For Y>1, if the upper layer parameter phase is set, the TDCP phase c TDCP =[c1 ... c Y ] is reported, where c i ∈{0,...,15}. The corresponding phase value is exp(j2πc i / 16).

[0195] (CSI-RS Port) In Rel. 15, for example, the 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 time and frequency tracking. The CSI-RS supports 1, 2, 4, 8, 12, 16, 24, and 32 ports (antenna ports, CSI-RS ports). The CSI-RS supports periodic, semi-persistent, and aperiodic transmission. The frequency density of the CSI-RS is configurable to adjust overhead and CSI estimation accuracy.

[0196] FIG. 1 is a diagram showing an example of the location of CSI-RSs within a slot. Each row in the table indicates a row number, the number of ports, the frequency domain density, the CDM type, the time and frequency (time / frequency) location (the location of the component resource (k bar, l bar)), the 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 time and frequency resource (component resource) of the CSI-RS corresponding to one port. The notation k bar is 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.

[0197] CDM groups include no CDM (no CDM, N / A), FD-CDM2, CDM4, and CDM8. FD-CDM2 multiplexes two-port CSI-RSs at the same time and frequency by multiplying a frequency domain (FD)-orthogonal cover code (OCC) of length 2 on an RE-by-RE basis (FD2). CDM4 multiplexes four-port CSI-RSs at the same time and frequency by multiplying a length-2 FD-OCC with a length-2 time domain (TD)-OCC on an RE-by-symbol basis (FD2TD2). CDM8 multiplexes eight-port CSI-RSs at the same time and frequency by multiplying a length-2 FD-OCC with a length-4 TD-OCC on an RE-by-symbol basis (FD2TD4).

[0198] Since the maximum number of CSI-RS ports, 32, is greater than the maximum number of layers, 8, the UE can measure many channel conditions, improving measurement accuracy.

[0199] In Rel. 19 and later, massive MIMO using more than 32 ports is being considered.

[0200] (Base Station Antenna Layout) Figure 2 shows a table relating the supported number of CSI-RS ports to the base station antenna layout ((N1, N2) and (O1, O2) settings) for a single panel in the existing specifications. Figure 3 shows a table relating the supported number of CSI-RS ports to the base station antenna layout ((N g , N1, N2) and (O1, O2) settings).

[0201] (Considerations) Targeting FR1, a CSI supporting up to 128 CSI-RS ports is being considered. Specifically, the following items are being considered: ◆ Item 2a: An improvement to the Type 1 codebook that is based on an extension of the existing codebook and assumes existing CSI-RS resources (with up to 32 CSI-RS ports per resource) to support a total of up to 128 CSI-RS ports across all resources. ◆ Item 2b: An improvement to the Type 2 codebook that is based on an extension of the existing codebook and assumes existing CSI-RS resources (with up to 32 CSI-RS ports per resource) to support a total of up to 128 CSI-RS ports across all resources, without changing any codebook parameters other than the introduction of 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 per CRI for one or more CRIs) for hybrid beamforming supporting up to 32 CSI-RS ports per resource and up to 128 total CSI-RS ports across all resources without new codebook design.

[0202] However, there has been insufficient consideration given to a method for setting / reporting CSI to support more than 32 CSI-RS ports, and if such a method is not given sufficient consideration, there is a risk that communication quality / throughput will deteriorate.

[0203] Therefore, the inventors have studied methods for setting / reporting CSI and have come up with the following embodiments.

[0204] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0205] (Various Reinterpretations) In the present disclosure, a word enclosed in "( )" in a sentence may indicate an explanation of the word immediately preceding it (for example, an explanation of spelling), a paraphrase, a specific example, a supplementary explanation, etc. Furthermore, in the present disclosure, a word enclosed in "[ ]" in a sentence may be interpreted including the word in the meaning of the entire sentence, or may be interpreted excluding (ignoring) the word in the meaning of the entire sentence. Note that "( )" and "[ ]" may also be used for purposes / meanings other than those mentioned above.

[0206] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0207] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0208] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0209] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., messages from the core network such as positioning protocol (e.g., NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP)) messages), or a combination thereof.

[0210] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0211] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0212] In the present disclosure, ceil(x), ceiling function, and ceiling function may be interchangeable. In the present disclosure, floor(x), floor function, and floor function may be interchangeable. In the present disclosure, sqrt(x), square root of x, and root x may be interchangeable. In the present disclosure, x mod y, mod(x, y), mod function, and modulo operation may be interchangeable. In the present disclosure, Σ i=M M＋N－1 f(i), Σ i=MM+N-1 f i , f(i) or f for i = M, M+1, ..., M+N-1 i Summation of f(M) + f(M+1) + ... + f(M+N-1), f M +f M＋1 +...+f M＋N－1 , may be read interchangeably. C(n, k) is the number of combinations of k values ​​selected from n values ​​(combinatorial coefficient), binomial coefficients, n C k , C n k In the present disclosure, x / y and floor(x / y) may be read as interchangeable.

[0213] In this disclosure, A b , A_b, Ab, and A with b added to the bottom right may be read interchangeably. c , A^c, and the notation of A with c added to the upper right may be read interchangeably. b c , A_b^c, and the notation in which b is added to the bottom right of A and c is added to the top right of A may be read interchangeably. ～ may be expressed by adding 〜 to the x, or may be referred to as x tilde. － may be represented by placing a minus sign (-) on top of the x, or may be referred to as an x-bar. ＾ may be represented by placing a ^ above the x, and may be called an x-hat.

[0214] In the present disclosure, FR may be, for example, at least one of FR1, FR2, FR2-1, FR2-2, FR3, sub-terahertz, and terahertz. In the present disclosure, the frequency range corresponding to FR1 may be 410-7125 MHz. In the present disclosure, FR2 may include FR2-1 and FR2-2, and the frequency range corresponding to FR2-1 may be 24250-52600 MHz, and the frequency range corresponding to FR2-1 may be 52600-71000 MHz.

[0215] In this disclosure, the following abbreviations may be used: FDM: frequency division multiplexing TDM: time division multiplexing

[0216] In the present disclosure, the terms indicate, report, and select may be read interchangeably.

[0217] In the present disclosure, beam, SD beam, precoder, antenna port, vector, SD basis, SD vector, and SD basis vector may be interchangeable. In the present disclosure, vector, beam, SD beam, SD vector, SD basis, and SD basis vector may be interchangeable.

[0218] In the present disclosure, the number of extended ports, the number of extended CSI-RS ports, the new P CSI-RS , P new , new port number, number of ports greater than 32, 48 / 64 / 72 / 96 / 128, may be read as interchangeable. In the present disclosure, extended ports, extended CSI-RS ports, new ports, ports greater than 32, 48 / 64 / 72 / 96 / 128 ports, and ports associated with new port CSI-RS resources may be read as interchangeable.

[0219] In the present disclosure, the number of existing ports, the number of existing CSI-RS ports, the number of existing P CSI-RS , P legacy, 32 or less ports may be read as interchangeable. In the present disclosure, legacy ports, legacy CSI-RS ports, 32 or less ports, and ports associated with legacy port CSI-RS resources may be read as interchangeable.

[0220] In the present disclosure, (N1, N2), (N1, N2) setting, (N1, N2) value, n1-n2, antenna setting, antenna placement, antenna position, gNB antenna, two-dimensional antenna, two-dimensional placement, two-dimensional position, two-dimensional placement setting, and setting regarding the size of the two-dimensional matrix for antenna placement / beam selection may be read interchangeably.

[0221] In the present disclosure, the terms "existing (N1, N2)," "(N1, N2) for the number of existing ports," "setting of a two-dimensional antenna arrangement for 32 or fewer ports," and "first setting regarding a two-dimensional arrangement of multiple antennas for 32 or fewer ports" may be interchangeable. In the present disclosure, the terms "new (N1, N2)," "(N1, N2) for the number of expansion ports," "setting of a two-dimensional antenna arrangement for more than 32 ports," and "second setting regarding a two-dimensional arrangement of multiple antennas for more than 32 ports" may be interchangeable. In the present disclosure, the terms "new (N g1 ,N g2 ), a third setting for a two-dimensional arrangement of multiple groups of antennas based on (N1, N2) for an extended port number, a setting for a two-dimensional panel arrangement for more than 32 ports, and a setting for a two-dimensional arrangement of multiple groups of antennas each associated with multiple CSI-RS resources may be read as interchangeable.

[0222] In the present disclosure, x-port CSI-RS resources, CSI-RS resources associated with x-ports, and CSI-RS resources using x-ports may be read interchangeably.

[0223] In the present disclosure, CSI-RS resources, existing port CSI-RS resources, CSI-RS, CMR, port group, group of 32 or less ports, port group, group of 32 or less ports associated with one CSI-RS resource, CSI-RS resources associated with a group of 32 or less ports, CSI-RS resources associated with a group of N1N2O1O2 SD beams based on existing (N1, N2), CSI-RS resources associated with a group of N1N2O1O2 gNB antennas based on existing (N1, N2), existing N1N2O1O2 antennas, existing N1N2O1O2 SD beams may be read as interchangeable.

[0224] In the present disclosure, groups, sets, blocks, and pools of 32 or less ports for supporting an expanded port count may be interchangeable. In the present disclosure, groups, sets, blocks, and pools of N1N2O1O2 SD beams based on existing (N1, N2) for supporting an expanded port count may be interchangeable. In the present disclosure, groups, sets, blocks, pools, and panels of N1N2O1O2 gNB antennas based on existing (N1, N2) for supporting an expanded port count may be interchangeable.

[0225] In the present disclosure, CSI-RS resources for an extended port number, new port CSI-RS resources, extended port CSI-RS resources, extended CSI-RS, extended CMR, new group, multiple port group, CSI-RS resources associated with more than 32 ports, CSI-RS resources associated with a group of N1N2O1O2 SD beams based on a new (N1, N2), CSI-RS resources associated with a group of N1N2O1O2 gNB antennas based on a new (N1, N2), new N1N2O1O2 antennas, and new N1N2O1O2 SD beams may be read interchangeably.

[0226] In this disclosure, (N g1 ,N g2), ng1-ng2, panel setting, gNB panel setting, arrangement / position / two-dimensional arrangement of CSI-RS resources / port groups / panels / antenna groups may be read interchangeably. g , ng, panel setting, gNB panel setting, CSI-RS resource / port group / panel / antenna group, may be read interchangeably.

[0227] In the present disclosure, new N1N2 and N1×N2 based on new (N1, N2) may be read interchangeably. In the present disclosure, existing N1N2 and N1×N2 based on existing (N1, N2) may be read interchangeably.

[0228] In the present disclosure, new N1N2O1O2 and N1O1×N2O2 based on new (N1, N2) may be read interchangeably. In the present disclosure, existing N1N2O1O2 and existing (N1, N2)-based N1O1×N2O2 may be read interchangeably.

[0229] In the present disclosure, the positions within new (N1, N2), the positions of gNB antennas based on new (N1, N2), and the positions within N1N2O1O2 gNB antennas based on new (N1, N2) may be interchangeable. In the present disclosure, the positions within existing (N1, N2), the positions of gNB antennas based on existing (N1, N2), the positions within N1N2O1O2 gNB antennas based on existing (N1, N2), and the positions within N1N2O1O2 existing gNB antennas may be interchangeable.

[0230] In this disclosure, the terms "SD beam based on new (N1, N2)" and "SD beam among N1N2O1O2 SD beams based on new (N1, N2)" may be interchangeable. In this disclosure, the terms "position within existing (N1, N2)," "SD beam based on existing (N1, N2)," and "SD beam among N1N2O1O2 SD beams based on existing (N1, N2)" may be interchangeable.

[0231] In the present disclosure, 1,1 ,i 1,2), the index indicating the beam, the first index, the third index, and the two-dimensional index may be read interchangeably. 1,4 The index indicating the CSI-RS resource corresponding to the beam, the second index, the one-dimensional index, and the two-dimensional index may be interpreted as interchangeable.

[0232] In the present disclosure, one or more channel measurement resources associated with more than 32 ports (the number of extended ports), one or more CMRs, one or more new port CSI-RS resources, multiple existing port CSI-RS resources, one or more new groups, and corresponding resource sets for channel measurement may be interchangeable. In the present disclosure, multiple channel measurement resources, one or more CMRs, multiple existing port CSI-RS resources, and corresponding resource sets for channel measurement may be interchangeable. In the present disclosure, one or more IMRs, one or more CSI-RS / CSI-IM resources for interference measurement, and corresponding resource sets for interference measurement may be interchangeable.

[0233] In this disclosure, the terms "channel measurement occasion" and "at least one CSI-RS transmission occasion" may be interchangeable. In this disclosure, the terms "interference measurement occasion" and "CSI-RS / CSI-IM occasion" may be interchangeable.

[0234] In the present disclosure, port group, SD beam group, orthogonal beam group, orthogonal vector group, orthogonal SD vector group, orthogonal SD basis vector group, N1N2 SD beams, N1N2 SD beams identified by q1 = {0, 1, ..., O1-1} and q2 = {0, 1, ..., O2-1}, one port group among O1O2 port groups, beam group, antenna / port group, and group including a number of beams determined by the number of two-dimensional antennas N1N2 may be read interchangeably.

[0235] (Wireless communication method) A UE may calculate one or more CSIs by measuring one or more CSI-RSs (resources) using an antenna port to which at least one embodiment is applied based on a CSI reporting configuration (CSI-ReportConfig), and may report the one or more CSIs.

[0236] (Embodiment AA) <Consideration> It may be difficult to share the same CSI-RS resources between the existing CSI-RS (e.g., up to 32 ports in Rel. 15-18) and the new CSI-RS (e.g., more than 32 ports in Rel. 19). Because the existing UE cannot despread the new TD-OCC / FD-OCC, the base station needs to configure separate sets of CSI-RS resources for the existing (e.g., Rel. 15-18) UE and the new (e.g., Rel. 19) UE. This causes CSI-RS overhead. Attempts to reduce the CSI-RS overhead may limit performance improvements for more than 32 CSI-RS ports.

[0237] Embodiment AA1: Instead of introducing more than 32 ports into the same CSI-RS resource (time and frequency resource), different CSI-RS resources may use different CSI-RS ports. Multiple CSI-RS resources may be aggregated for a new UE.

[0238] For example, two CSI-RS resources may be configured, with the first CSI-RS resource associated with CSI-RS ports #0 to #31 and the second CSI-RS resource associated with CSI-RS ports #32 to #63. In this case, it is easy to share the CSI-RS resources between the existing UE and the new UE. For example, only the first CSI-RS resource may be configured for the existing UE, and both the first and second CSI-RS resources may be configured for the new UE.

[0239] According to this embodiment AA1, by changing the definition of the CSI-RS port mapping, it is possible to define more than 32 CSI-RS ports, with less impact on the specifications.

[0240] As in the example of Figure 4, FDM CSI-RS resource #1 and CSI-RS resource #2 may be configured, with CSI-RS resource #1 associated with CSI-RS ports #0 to #31 and CSI-RS resource #2 associated with CSI-RS ports #32 to #63.

[0241] As in the example of Figure 5, TDM CSI-RS resource #1 and CSI-RS resource #2 may be configured, with CSI-RS resource #1 associated with CSI-RS ports #0 to #31 and CSI-RS resource #2 associated with CSI-RS ports #32 to #63.

[0242] The size of the time resource of each CSI-RS resource may be slot / subslot / subframe. The size of the frequency resource of each CSI-RS resource may be PRB / 2 N Alternatively, the number of consecutive PRBs may be N (N=-2, -1, 1, 2, ...).

[0243] A method for mapping more than 32 CSI-RS ports across multiple CSI-RS resources may be according to at least one of several embodiments AA1-X below.

[0244] <<Embodiment AA1-1>> When a UE is configured with higher layer parameters enabling more than 32 CSI-RS ports and with x CSI-RS ports and y CSI-RS resources, the UE may map the CSI-RS ports according to at least one of the following rules. x may be less than or equal to 32. - The first resource of the y CSI-RS resources (or a CSI-RS resource set) is mapped to CSI-RS ports #0 to #x-1. - The second resource of the y CSI-RS resources (or a CSI-RS resource set) is mapped to CSI-RS ports #x to #2x-1. - The third resource of the y CSI-RS resources (or a CSI-RS resource set) is mapped to CSI-RS ports #2x to #3x-1. The i-th resource in the y CSI-RS resources (or CSI-RS resource set) is mapped to CSI-RS ports #(i-1)x to #ix-1, where the i-th resource may be the CSI-RS resource corresponding to the i-th time resource (e.g., slot) or the CSI-RS resource corresponding to the i-th frequency resource (e.g., PRB).

[0245] <<Embodiment AA1-2>> Aggregated CSI-RS resources may be associated with more than 32 CSI-RS ports. Each CSI-RS resource may be associated with 32 or fewer CSI-RS ports. The CSI-RS resources for aggregation may comply with at least one constraint from several of the following options: - Option 1: The number of CSI-RS resources for aggregation is M. For example, M may be 2. - Option 2: The number of ports associated with each CSI-RS resource for aggregation is fixed to N or is greater than O (equal to or greater than O). For example, N may be 32. For example, O may be 16. - Option 3: The CSI-RS resources for aggregation are configured within the same CSI-RS resource set or CSI-RS resource group. - Option 4: Multiple CSI-RS resources for aggregation may have the same configuration of at least one of density, number of ports, time operation setting, frequency resource allocation, time resource allocation, QCL assumption, scrambling ID, and new scrambling ID. The time operation setting may indicate a P, SP, or AP. The frequency resource allocation may be at the wideband level or the RB level. The wideband level may be the number of PRBs and the starting PRB. The time resource allocation may be at the slot level. The QCL assumption may be an associated SSB. Multiple CSI-RS resources for aggregation may have different configurations of at least one of time resource allocation, frequency resource allocation, and scrambling ID. - Option 5: Multiple CSI-RS resources for aggregation may be located in M ​​or fewer consecutive slots or in consecutive / comb-like frequency resources. Example: M=2 CSI-RS resources may be aggregated and associated with 64 CSI-RS ports, and each CSI-RS resource may be associated with 32 CSI-RS ports.The two CSI-RS resources are in the same CSI-RS resource set or CSI-RS resource group, have the same frequency resource configuration, and are respectively arranged in two consecutive slots.

[0246] <<Embodiment AA1-3>> In an aggregated multiple CSI-RS resource having more than 32 ports, some parameters may be additionally configured or existing parameters may be overwritten. For example, the some parameters may be at least one of density, new scrambling ID, number of PRBs, and starting PRB. To reduce the complexity of UE measurements, a density smaller than the existing density may be configured.

[0247] ((Embodiment AB)) <Considerations> The base station antenna layout and configuration for more than 32 CSI-RS ports has not been thoroughly considered.

[0248] Embodiment AB1: A novel antenna layout and configuration for CSI-RS with more than 32 ports may follow at least one of the following options.

[0249] - Option 1: A new (N1,N2) and a new (O1,O2) may be defined in the specification and configured in the UE. A new row may be added to the existing table. The new row may be used only if a CSI-RS with more than 32 ports for the CSI codebook is configured. A new table separate from the existing table may be added. The new table may be used only if a CSI-RS with more than 32 ports for the CSI codebook is configured, otherwise the existing table may be used.

[0250] 6 shows an example of a configuration according to Option 1 of embodiment AB1. At least one row in this table may be supported. This table shows multiple combinations (rows) of the number of CSI-RS ports (>32), (N1, N2), and (O1, O2).

[0251] - Option 2 (similar to the setting for multi-panel), N is combined with at least one value of existing (N1,N2) and existing (O1,O2). g A new parameter ng indicating the parameter ng may be added to the configuration. The new configuration may be defined in the specification and configured to the UE.

[0252] N g may be set as a separate parameter from the (N1, N2) setting. For example, N g Two parameters ng and n1-n2 may be configured, indicating the number of CSI-RS ports (>32) and (N1, N2), respectively. Figure 7 shows a first example of the configuration according to option 2 of embodiment AB1. At least one combination in this table may be supported. This table indicates the number of CSI-RS ports (>32) and N g This shows multiple combinations of existing (N1,N2) and (O1,O2). Different (N1,N2) may be included in separate lines. As with the example of Option 1, different (O1,O2) for different (N1,N2) may be different. Lines marked with * may not be needed by reusing existing settings for many ports.

[0253] N g may be set as a new parameter joint with the (N1,N2) setting. For example, (N g , N1, N2). Figure 8 shows a second example of the configuration according to option 2 of embodiment AB1. At least one row of this table may be supported. This table specifies the number of CSI-RS ports (>32) and the number of new (N g ,N1,N2) and (O1,O2). For the * lines, by reusing the existing settings of many ports, the * lines may not be needed.

[0254] The UE is g It may be appreciated that only one dimension is extended by the value. As an example of FIG. 9A, an antenna layout for 64 ports (N g,N1,N2)=(2,8,2) may mean two antenna layouts (N1,N2)=(8,2) in the horizontal direction. As in the example of FIG. 9B, the antenna layout (N g ,N1,N2)=(4,8,2) may mean a four antenna layout (N1,N2)=(8,2) in the horizontal direction. In these examples, the spacing between two adjacent antenna elements in the horizontal or vertical direction is d.

[0255] - Option 3 (N1, N2) combined with at least one value of existing (O1, O2) g1 ,N g2 A new parameter ng1-ng2 indicating the number of times the UE is connected to the UE may be added to the configuration. The new configuration may be defined in the specification and configured to the UE.

[0256] (N g1 ,N g2 ) may be set as a separate parameter from the (N1, N2) setting. For example, (N g1 ,N g2 Two parameters ng1-ng2 and n1-n2 may be set, indicating the number of CSI-RS ports (>32) and (N1, N2), respectively. FIG. 10 shows a first example of the setting according to option 3 of embodiment AB1. At least one combination in this table may be supported. This table specifies the number of CSI-RS ports (>32) and the number of CSI-RS ports (N g1 ,N g2 ), existing (N1,N2), and (O1,O2) are shown as multiple combinations. For the lines marked with *, by reusing the settings of many existing ports, the lines marked with * may not be needed.

[0257] (N g1 ,N g2 ) may be set as a new parameter joint with the (N1,N2) setting. For example, (N g1 ,N g2, N1, N2). FIG. 11 shows a second example of the configuration according to option 3 of embodiment AB1. At least one row of this table may be supported. This table specifies the number of CSI-RS ports (>32) and the number of new (N g1 ,N g2 ,N1,N2) and (O1,O2). For the * lines, by reusing the existing settings of many ports, the * lines may not be needed.

[0258] The UE is (N g1 ,N g2 ) values ​​may be recognized as extending two dimensions. g1 may correspond to N1 (horizontal direction), and N g2 may correspond to N2 (vertical direction). As an example of FIG. 12A, the antenna layout for 128 ports (N g1 ,N g2 ,N1,N2)=(2,2,8,2) may mean an antenna layout (N1,N2)=(8,2) with two horizontal and two vertical antennas. g1 ,N g2 ,N1,N2)=(4,1,8,2) may mean an antenna layout (N1,N2)=(8,2) with four horizontal and one vertical antenna elements. In these examples, the spacing between two horizontally or vertically adjacent antenna elements is d.

[0259] <<Variations>> The values ​​of (O1,O2) for each value of (N1,N2) may be defined in the specification or may be configurable. The values ​​of (O1,O2) may follow at least one of the following options: - Option 1: The values ​​of (O1,O2) are common to all ranks (number of layers). - Option 2: The values ​​of (O1,O2) are different for different ranks. For example, for lower ranks, (O1,O2) have larger values, and for higher ranks, (O1,O2) have smaller values. For example, when (N1,N2)=(16,2), (O1,O2)=(4,4) for ranks 1 to 2, and (O1,O2)=(1,1) for ranks 3 to 8.

[0260] According to this embodiment AB1, the UE can be properly configured with a base station antenna layout for CSI-RS that uses more than 32 ports.

[0261] ((Embodiment AH)) <Considerations> It is considered that CSI-RS resources for more than 32 ports will not be directly designed and transmitted. Instead, it is considered that multiple existing CSI-RS resources, each with up to 32 CSI-RS ports, will be used for measurements.

[0262] However, the method for mapping / associating each existing CSI-RS resource to a gNB antenna from the antenna configuration (N1, N2) has not been fully considered, which would lead to different UE behaviors regarding how to perform CSI calculations based on measurements of multiple CSI-RS resources. This association ensures that the gNB and UE have the same understanding of the reported SD beam.

[0263] The following three mappings / associations between factors A, B, and C are possible: ◆ Factor A: Port of CSI-RS resource ◆ Factor B: Indexing of port of extended port number ◆ Factor C: Position within new (N1, N2).

[0264] Embodiment AA1 shows the association between factors A and B.

[0265] Embodiment AH1 Embodiment AH1 relates to the generation of 128 ports.

[0266] To generate 128 ports, four 32-port CSI-RS resources (existing CSI-RS resources) may be configured to be transmitted, and the four 32-port CSI-RS resources may be TDM'd within the same slot or consecutive slots.

[0267] For each port of the transmitted 32-port CSI-RS, the mapping / association to a gNB antenna in the antenna configuration may be defined in the specification using the existing (N1, N2) configuration for the 32 ports or a new (N g1 ,N g2 ) configuration. The mapping / association may be based on at least one of several options:

[0268] ◆ Option 1: Association of 32-port CSI-RS to multiple antennas considers only the existing (N1, N2) for 32 ports. The existing (N1, N2) may be, for example, (4, 4), (8, 2), or (16, 1).

[0269] ◆ Option 2: The association of a 32-port CSI-RS to multiple antennas is not limited to the existing (N1, N2) for 32 ports. Any rule defined in the specification may be considered. ◆ For example, the association may first map the 32 ports to gNB antennas in the horizontal domain dimension and then map them to gNB antennas in the vertical dimension, or the association may first map the 32 ports to gNB antennas in the vertical domain dimension and then map them to gNB antennas in the horizontal dimension. ◆ For example, the association may first map the 32 ports to the 1st, (1 + d)th, ... gNB antennas in the horizontal dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the vertical dimension, or the association may first map the 32 ports to the 1st, (1 + d)th, ... gNB antennas in the vertical dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the horizontal dimension. -◆The association may map the 32 ports to multiple gNB antennas according to other rules.

[0270] For each port of one CSI-RS and antenna position within the existing (N1, N2), the existing rules may be applied / transferred to each embodiment for port mapping within each existing (N1, N2).

[0271] The following several new (N1, N2) configurations for 128 ports may be supported:

[0272] ◆ New (64,1) Configuration for 128 Ports If this configuration is supported, at least one rule from the following options may be defined: ◆ Option 1-a: Each 32-port CSI-RS resource may be defined to be associated with an existing (16,1) antenna using a specific order. In the example of FIG. 13A, four 32-port CSI-RSs are mapped to four (16,1) antennas arranged in the horizontal domain. As in the example of FIG. 13B, the four 32-port CSI-RSs may be TDM. The indexing of ports within the existing (N1,N2) = (16,1) of the 32-port CSI-RS may follow existing rules. The mapping of each CSI-RS port to a gNB antenna within the existing (N1,N2) may follow existing rules. The existing rules map ports first to antennas of one polarization and then to antennas of the other polarization. For example, of the 32 ports, ports 0 through 15 may be mapped to a horizontally polarized antenna in (16,1), and ports 16 through 31 may be mapped to a vertically polarized antenna in (16,1).

[0273] ◆ New (16,4) setting for 128 ports If this setting is supported, at least one rule of the following options may be defined:

[0274] Option 1-a: Each 32-port CSI-RS may be defined to be associated with an existing (4,4) antenna using a specific order. In the example of Figure 14A, four 32-port CSI-RSs are mapped to four (4,4) antennas. The four (4,4) antennas are arranged in the horizontal domain.

[0275] -◆Option 1-b: Each 32-port CSI-RS may be defined to be associated with an existing (8,2) antenna using a specific order. In the example of Figure 14B, four 32-port CSI-RSs are mapped to four (8,2) antennas. Of the four (8,2) antennas, two (8,2) antennas are arranged in the vertical domain and then in the horizontal domain.

[0276] Option 1-c: Each 32-port CSI-RS may be defined to be associated with an existing (16,1) antenna using a specific order. In the example of Figure 14C, four 32-port CSI-RSs are mapped to four (16,1) antennas. The four (16,1) antennas are arranged in the vertical domain.

[0277] -◆Option 1-d: Associations between (4,4), (8,2), and (16,1) and at least one existing (N1,N2) are supported, and a new (N g1 ,N g2 ) and the existing (N1,N2) for 32 ports. In the example of FIG. 15, the existing (N1,N2) of (4,4), (8,2), and (16,1) are specified / set by the new (N1,N2) of (4,1), (2,2), and (1,4). g1 ,N g2 ) are associated with each other.

[0278] -◆Option 2-a: The rule is that each CSI-RS is associated with multiple antennas distributed in the horizontal domain. In the example of Figure 16, the first CSI-RS is associated with antennas (1, 5, 9, 13) in the horizontal domain and antennas (1st to 4th) in the vertical domain. The second CSI-RS is associated with antennas (2, 6, 10, 14) in the horizontal domain and antennas (1st to 4th) in the vertical domain. The third CSI-RS is associated with antennas (3, 7, 11, 15) in the horizontal domain and antennas (1st to 4th) in the vertical domain. The fourth CSI-RS is associated with antennas (4, 8, 12, 16) in the horizontal domain and antennas (1st to 4th) in the vertical domain. If i = 1, 2, 3, 4 and j = 1, 2, 3, 4, the i-th CSI-RS is associated with the i+4(j-1)th antenna in the horizontal domain and the 1st to 4th antennas in the vertical domain.

[0279] -◆The antenna arrangement is not limited to the above example. The number of antennas arranged in the horizontal domain and the number of antennas arranged in the vertical domain may be reversed.

[0280] - For different associations, the measurements at the UE and the method of calculating the complete channel / CSI based on the four measurements may be different.

[0281] -◆When the channel variations in the four CSI-RS resources at different timings are considered, the performance of each association method (rule) may also be different.

[0282] ◆ New (32,2) setting for 128 ports If this setting is supported, at least one rule of the following options may be defined:

[0283] -◆Option 1-a: Each 32-port CSI-RS may be defined to be associated with an existing (8,2) antenna using a specific order.

[0284] -◆Option 1-b: Each 32-port CSI-RS may be defined to be associated with an existing (16,1) antenna using a specific order.

[0285] -◆Option 1-c: The association between (8,2) and (16,1) and at least one existing (N1,N2) is supported, and a new (N g1 ,N g2 ) and the existing (N1, N2) for 32 ports.

[0286] -◆Option 2-a: The rule is not limited to the existing (N1,N2) of (8,2) and (16,1).

[0287] ◆ New (8,8) setting for 128 ports If this setting is supported, at least one rule of the following options may be defined:

[0288] -◆Option 1-a: Each 32-port CSI-RS may be defined to be associated with an existing (4,4) antenna using a specific order.

[0289] -◆Option 1-b: Each 32-port CSI-RS may be defined to be associated with an existing (8,2) antenna using a specific order.

[0290] -◆Option 1-c: Each 32-port CSI-RS may be defined to be associated with an existing (16,1) antenna using a specific order.

[0291] -◆Option 1-d: Associations between (4,4), (8,2), and (16,1) and at least one existing (N1,N2) are supported, and a new (N g1 ,N g2 ) and the existing (N1, N2) for 32 ports.

[0292] -◆Option 2-a: The rule is not limited to the existing (N1,N2) of (4,4), (8,2) and (16,1).

[0293] 17 shows an example of association candidates considering 32 existing ports (N1, N2) in Option 1. As described above, this example is based on the number of CSI-RS antenna ports, 128, new (N1, N2), existing (N1, N2), and new (N g1 ,N g2 ) and . Only a subset of the associations in this example may be supported or configurable.

[0294] According to embodiment AH1, multiple CSI-RSs, each using 32 or fewer ports, can be appropriately mapped / associated to multiple gNB antennas, and 128 CSI-RS ports can be appropriately utilized.

[0295] Embodiment AH2 Embodiment AH2 relates to the creation of 96 ports.

[0296] At least one of the following embodiments AH2-1 and AH2-2 may be supported: At least one of the following embodiments AH2-1 and AH2-2 may be configurable.

[0297] <<Embodiment AH2-1>> To generate 96 ports, three 32-port CSI-RS resources (existing CSI-RS resources) may be configured to be transmitted, and the three 32-port CSI-RS resources may be TDM'd within the same slot or multiple consecutive slots.

[0298] For each port of the transmitted 32-port CSI-RS, the mapping / association to a gNB antenna in the antenna configuration may be defined in the specification using the existing (N1, N2) configuration for the 32 ports or a new (N g1 ,N g2 ) configuration. The mapping / association may be based on at least one of several options:

[0299] ◆ Option 1: Association of 32-port CSI-RS to multiple antennas considers only the existing (N1, N2) for 32 ports. The existing (N1, N2) may be, for example, (4, 4), (8, 2), or (16, 1).

[0300] ◆ Option 2: The association of a 32-port CSI-RS to multiple antennas is not limited to the existing (N1, N2) for 32 ports. Any rule defined in the specification may be considered. ◆ For example, the association may first map the 32 ports to gNB antennas in the horizontal domain dimension and then map them to gNB antennas in the vertical dimension, or the association may first map the 32 ports to gNB antennas in the vertical domain dimension and then map them to gNB antennas in the horizontal dimension. ◆ For example, the association may first map the 32 ports to the 1st, (1 + d)th, ... gNB antennas in the horizontal dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the vertical dimension, or the association may first map the 32 ports to the 1st, (1 + d)th, ... gNB antennas in the vertical dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the horizontal dimension. -◆The association may map the 32 ports to multiple gNB antennas according to other rules.

[0301] For each port of one CSI-RS and antenna position within the existing (N1, N2), the existing rules may be adapted or may be applied to the below-described embodiments for port mapping within each existing (N1, N2).

[0302] 18 shows an example of association candidates considering 32 existing ports (N1, N2) in Option 1. This example shows 96 CSI-RS antenna ports, new (N1, N2), existing (N1, N2), and new (N g1 ,N g2 ) and . Only a subset of the associations in this example may be supported or configurable.

[0303] New (N1,N2) = (12,4), Existing (N1,N2) = (4,4), New (N g1 ,N g2 In the case where (3,1) = (3,1), as in this example, three CSI-RSs may be associated with (4,4) antennas arranged in the horizontal domain, respectively.

[0304] <<Embodiment AH2-2>> To generate 96 ports, four 24-port CSI-RS resources (existing CSI-RS resources) may be configured to be transmitted, and the four 24-port CSI-RS resources may be TDM'd within the same slot or multiple consecutive slots.

[0305] For each port of the transmitted 24-port CSI-RS, the mapping / association to a gNB antenna in the antenna configuration may be defined in the specification using the existing (N1, N2) configuration for the 24 ports or a new (N g1 ,N g2 ) configuration. The mapping / association may be based on at least one of several options:

[0306] ◆ Option 1: Association of 24-port CSI-RS to multiple antennas considers only the existing (N1, N2) for 24 ports. The existing (N1, N2) may be, for example, (4, 3), (6, 2), or (12, 1).

[0307] ◆ Option 2: The association of a 24-port CSI-RS to multiple antennas is not limited to the existing (N1, N2) for 24 ports. Any rule defined in the specification may be considered. ◆ For example, the association may first map the 24 ports to gNB antennas in the horizontal domain dimension and then map them to gNB antennas in the vertical dimension, or the association may first map the 24 ports to gNB antennas in the vertical domain dimension and then map them to gNB antennas in the horizontal dimension. ◆ For example, the association may first map the 24 ports to the 1st, (1 + d)th, ... gNB antennas in the horizontal dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the vertical dimension, or the association may first map the 24 ports to the 1st, (1 + d)th, ... gNB antennas in the vertical dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the horizontal dimension. -◆The association may map the 24 ports to multiple gNB antennas according to other rules.

[0308] For each port of one CSI-RS and antenna position within the existing (N1, N2), the existing rules may be adapted or may be applied to the below-described embodiments for port mapping within each existing (N1, N2).

[0309] 19 shows an example of association candidates considering 24 existing ports (N1, N2) in Option 1. This example shows the number of CSI-RS antenna ports, 96, new (N1, N2), existing (N1, N2), and new (N g1 ,N g2 ) and . Only a subset of the associations in this example may be supported or configurable.

[0310] New (N1,N2) = (12,4), Existing (N1,N2) = (12,1), New (N g1 ,N g2 In the case where r = (1,4), as in this example, four CSI-RS may be associated with four (12,1) antennas arranged in the horizontal domain, respectively.

[0311] New (N1,N2) = (12,4), Existing (N1,N2) = (6,2), New (N g1 ,N g2 In the case where ≡(R,R)=(2,2), as in this example, of the four CSI-RSs, first two CSI-RSs may be associated with the vertical domain and then with the horizontal domain.

[0312] According to embodiment AH2, multiple CSI-RSs, each using 32 or fewer ports, can be appropriately mapped / associated to multiple gNB antennas, and 96 CSI-RS ports can be appropriately utilized.

[0313] Embodiment AH3 Embodiment AH3 relates to the creation of 72 ports.

[0314] To generate 72 ports, three 24-port CSI-RS resources (existing CSI-RS resources) may be configured to be transmitted, and the three 24-port CSI-RS resources may be TDM'd within the same slot or multiple consecutive slots.

[0315] For each port of the transmitted 24-port CSI-RS, the mapping / association to a gNB antenna in the antenna configuration may be defined in the specification using the existing (N1, N2) configuration for the 24 ports or a new (N g1 ,N g2 ) configuration. The mapping / association may be based on at least one of several options:

[0316] ◆ Option 1: Association of 24-port CSI-RS to multiple antennas considers only the existing (N1, N2) for 24 ports. The existing (N1, N2) may be, for example, (4, 3), (6, 2), or (12, 1).

[0317] ◆ Option 2: The association of a 24-port CSI-RS to multiple antennas is not limited to the existing (N1, N2) for 24 ports. Any rule defined in the specification may be considered. ◆ For example, the association may first map the 24 ports to gNB antennas in the horizontal domain dimension and then map them to gNB antennas in the vertical dimension, or the association may first map the 24 ports to gNB antennas in the vertical domain dimension and then map them to gNB antennas in the horizontal dimension. ◆ For example, the association may first map the 24 ports to the 1st, (1 + d)th, ... gNB antennas in the horizontal dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the vertical dimension, or the association may first map the 24 ports to the 1st, (1 + d)th, ... gNB antennas in the vertical dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the horizontal dimension. -◆The association may map the 24 ports to multiple gNB antennas according to other rules.

[0318] For each port of one CSI-RS and antenna position within the existing (N1, N2), the existing rules may be adapted or may be applied to the below-described embodiments for port mapping within each existing (N1, N2).

[0319] 20 shows an example of association candidates considering 24 existing ports (N1, N2) in Option 1. This example shows the number of CSI-RS antenna ports, 72, new (N1, N2), existing (N1, N2), and new (N g1 ,N g2 ) and . Only a subset of the associations in this example may be supported or configurable.

[0320] New (N1,N2) = (12,3), Existing (N1,N2) = (12,1), New (N g1 ,N g2 In the case where r = (1,3), as in this example, three CSI-RS may be associated with three (12,1) antennas arranged in the vertical domain, respectively.

[0321] New (N1,N2) = (12,3), Existing (N1,N2) = (4,3), New (N g1 ,N g2 In the case where r = (3,1), as in this example, three CSI-RS may be associated with three (4,3) antennas arranged in the horizontal domain, respectively.

[0322] For the new (N1,N2) = (9,4), it may not be possible to map to the existing 24-port (N1,N2) = (4,3), (6,2), or (12,1). For the new (N1,N2) = (9,4), at least one of the following options may be defined: ◆ Option a: For 72 ports, the new (N1,N2) = (9,4) antenna configuration is not supported. ◆ Option b: The association of the 24-port CSI-RS follows the other rules of Option 2. ◆ Option c: A 12-port CSI-RS is considered. That is, six 12-port CSI-RS may be configured to be transmitted. The six 12-port CSI-RS resources may be TDM'd within the same slot or multiple consecutive slots. Each CSI-RS resource may be TDM'd within the new (N g1 ,N g2 ) = (3,2) may be used to associate with the existing (N1,N2) = (3,2) antenna.

[0323] According to embodiment AH3, multiple CSI-RSs, each using 32 or fewer ports, can be appropriately mapped / associated to multiple gNB antennas, and 72 CSI-RS ports can be appropriately utilized.

[0324] Embodiment AH4 Embodiment AH4 relates to the creation of 64 ports.

[0325] To generate 64 ports, two 32-port CSI-RS resources (existing CSI-RS resources) may be configured to be transmitted, and the two 32-port CSI-RS resources may be TDM'd within the same slot or consecutive slots.

[0326] For each port of the transmitted 32-port CSI-RS, the mapping / association to a gNB antenna in the antenna configuration may be defined in the specification using the existing (N1, N2) configuration for the 32 ports or a new (N g1 ,N g2 ) configuration. The mapping / association may be based on at least one of several options:

[0327] ◆ Option 1: Association of 32-port CSI-RS to multiple antennas considers only the existing (N1, N2) for 32 ports. The existing (N1, N2) may be, for example, (4, 4), (8, 2), or (16, 1).

[0328] ◆ Option 2: The association of a 32-port CSI-RS to multiple antennas is not limited to the existing (N1, N2) for 32 ports. Any rule defined in the specification may be considered. ◆ For example, the association may first map the 32 ports to gNB antennas in the horizontal domain dimension and then map them to gNB antennas in the vertical dimension, or the association may first map the 32 ports to gNB antennas in the vertical domain dimension and then map them to gNB antennas in the horizontal dimension. ◆ For example, the association may first map the 32 ports to the 1st, (1 + d)th, ... gNB antennas in the horizontal dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the vertical dimension, or the association may first map the 32 ports to the 1st, (1 + d)th, ... gNB antennas in the vertical dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the horizontal dimension. -◆The association may map the 32 ports to multiple gNB antennas according to other rules.

[0329] For each port of one CSI-RS and antenna position within the existing (N1, N2), the existing rules may be adapted or may be applied to the below-described embodiments for port mapping within each existing (N1, N2).

[0330] 21 shows an example of association candidates considering 32 existing ports (N1, N2) in Option 1. This example shows the number of CSI-RS antenna ports as 64, new (N1, N2), existing (N1, N2), and new (N g1 ,N g2 ) and . Only a subset of the associations in this example may be supported or configurable.

[0331] New (N1,N2) = (8,4), Existing (N1,N2) = (8,2), New (N g1 ,N g2 In the case where (8,2) = (1,2), as in this example, two CSI-RS may be associated with two (8,2) antennas respectively arranged in the vertical domain.

[0332] New (N1,N2) = (8,4), Existing (N1,N2) = (4,4), New (N g1 ,N g2 In the case where (r, r) = (2, 1), as in this example, two CSI-RS may be associated with two (4, 4) antennas respectively arranged in the horizontal domain.

[0333] According to embodiment AH4, multiple CSI-RSs, each using 32 or fewer ports, can be appropriately mapped / associated to multiple gNB antennas, and 64 CSI-RS ports can be appropriately utilized.

[0334] Embodiment AH5 Embodiment AH5 relates to the creation of 48 ports.

[0335] To generate 48 ports, two 24-port CSI-RS resources (existing CSI-RS resources) may be configured to be transmitted, and the two 24-port CSI-RS resources may be TDM'd within the same slot or consecutive slots.

[0336] For each port of the transmitted 24-port CSI-RS, the mapping / association to a gNB antenna in the antenna configuration may be defined in the specification using the existing (N1, N2) configuration for the 24 ports or a new (N g1 ,N g2) configuration. The mapping / association may be based on at least one of several options:

[0337] ◆ Option 1: Association of 24-port CSI-RS to multiple antennas considers only the existing (N1, N2) for 24 ports. The existing (N1, N2) may be, for example, (4, 3), (6, 2), or (12, 1).

[0338] ◆ Option 2: The association of a 24-port CSI-RS to multiple antennas is not limited to the existing (N1, N2) for 24 ports. Any rule defined in the specification may be considered. ◆ For example, the association may first map the 24 ports to gNB antennas in the horizontal domain dimension and then map them to gNB antennas in the vertical dimension, or the association may first map the 24 ports to gNB antennas in the vertical domain dimension and then map them to gNB antennas in the horizontal dimension. ◆ For example, the association may first map the 24 ports to the 1st, (1 + d)th, ... gNB antennas in the horizontal dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the vertical dimension, or the association may first map the 24 ports to the 1st, (1 + d)th, ... gNB antennas in the vertical dimension and then map them to the 2nd, (2 + d)th, ... gNB antennas in the horizontal dimension. -◆The association may map the 24 ports to multiple gNB antennas according to other rules.

[0339] For each port of one CSI-RS and antenna position within the existing (N1, N2), the existing rules may be adapted or may be applied to the below-described embodiments for port mapping within each existing (N1, N2).

[0340] 22 shows an example of association candidates considering 24 existing ports (N1, N2) in Option 1. This example shows the number of CSI-RS antenna ports: 48, new (N1, N2), existing (N1, N2), and new (N g1 ,N g2) and . Only a subset of the associations in this example may be supported or configurable.

[0341] According to embodiment AH5, multiple CSI-RSs, each using 32 or fewer ports, can be appropriately mapped / associated to multiple gNB antennas, and 48 CSI-RS ports can be appropriately utilized.

[0342] <Variation 1 of Embodiment AH> For an extension port number exceeding 32, multiple CSI-RS resources having a number of existing ports smaller than the number of ports in Embodiments AH1 to AH4 may be configured. The extension port number may include, for example, at least one of 48, 64, 72, 96, and 128. The existing port number may include, for example, at least one of 12 and 16. Association of gNB antennas using CSI-RS resources for the existing port number may take into account the existing (N1, N2) setting of the existing port number.

[0343] If more CSI-RS resources are used (using the existing number of ports per CSI-RS resource), they need to be transmitted for a longer time period, which makes the measurement results less accurate due to the varying channel during that time period, and also makes the UE measurements more complex.

[0344] <Variation 2 of Embodiment AH> With regard to the factors A, B, and C described above, embodiment AA1 shows the association between factors A and B, and embodiments AH1 to AH5 show the association between factors A and C.

[0345] <<Variation 2A>> An association between factors A and C may be defined / established. This association may be combined with the association between factors A and B in embodiment AA1. The association between factors A and C may be based on at least one of several options:

[0346] ◆ Option 1: At each position in the new (N1, N2), the ports may be indexed first into the horizontal domain, then into the vertical domain, and then into the polarization domain. In the indexing, the order of the horizontal domain, the vertical domain, and the polarization domain may be other orders. The ports may be from 0 to X-1 or from 1 to X. For example, X may be 128 / 96 / 72 / 64 / 48.

[0347] ◆ Option 2: At each position in the new (N1, N2), g1 ,N g2 ) and existing (N1, N2) may be set. New (N g1 ,N g2 ) by N g1 ×N g2 The ports may be indexed into the horizontal domain, then into the vertical domain, then into the polarization domain, and then into the group domain. The indexing order of the horizontal domain, vertical domain, polarization domain, and group domain may be other orders. The ports may be numbered from 0 to 127 or from 1 to 128.

[0348] <<Variation 2B>> An association between factors A and C and an association between factors B and C may be defined / configured. The association between factors A and B in embodiment AA1 may not be used, and an association between factors A, B, and C may be established. The final result may not be that the first CSI-RS resource is mapped to port indexes 0 to 31. This may lead to other associations between factors A and B.

[0349] <<Variation 2C>> Associations between factors A, B and C may be defined / established.

[0350] <Variation 3 of Embodiment AH> Embodiment AH may be applied to an extension based on Type 1 / Type 2 / Extended Type 2 / Additional Extended Type 2 using new (N1, N2). In an extension based on Rel. 15 Type 1 multi-panel CSI, the mapping / association to be defined / configured may be based on at least one of the following options: ◆ Option 1: An association between factors A and B and an association between factors A and C are defined / configured. For example, each CSI-RS resource may correspond to one panel or multiple panels. Consecutive ports may be indexed for each panel. ◆ Option 2: An association between factors A and B and an association between factors A and C are defined / configured. ◆ Option 3: An association between factors A and C and an association between factors B and C are defined / configured. ◆ Option 4: An association between factors A, B, and C is defined / configured. A table for the association between factors A, B, and C may be defined, and a new association indicator may be defined to indicate / set the association between factors A, B, and C. For example, association indicator=1 may be associated with four antenna groups #1 to #4 of (16,1) antennas. Each group may be associated with a CSI-RS resource. Antenna group #1 may be associated with port indexes 0 to 31, antenna group #2 may be associated with port indexes 32 to 63, antenna group #3 may be associated with port indexes 64 to 95, and antenna group #4 may be associated with port indexes 96 to 127.

[0351] Figure 23 shows an example of a 32-port association candidate for a multi-panel. In this example, the multi-panel g1 ,N g2 ) are two panels based on the number of CSI-RS antenna ports of 64, new (N1, N2), existing (N1, N2), and new (N g1 ,N g2) and . Only a subset of the associations in this example may be supported or configurable.

[0352] New (N1,N2) = (8,4), Existing (N1,N2) = (8,2), New (N g1 ,N g2 In the case where (8,2) = (1,2), as in this example, two CSI-RS may be associated with two (8,2) antennas respectively arranged in the vertical domain.

[0353] New (N1,N2) = (8,4), Existing (N1,N2) = (4,4), New (N g1 ,N g2 In the case where (r, r) = (2, 1), as in this example, two CSI-RS may be associated with two (4, 4) antennas respectively arranged in the horizontal domain.

[0354] As in the example of FIG. 24, two CSI-RS resources may be TDM'd, with the first CSI-RS using ports 0 to 31 and the second CSI-RS using ports 32 to 63.

[0355] ((Embodiment AJ)) <Consideration> SD beam selection and i in embodiment AB 1,1 , i 1,2 (Additionally, for some ranks, 1,3 ) new (N1, N2) are defined for the number of expansion ports greater than 32. The number of expansion ports may be, for example, 48 / 64 / 72 / 96 / 128.

[0356] In embodiment AB, for larger N1O1 and N2O2, i for each rank 1,1 , i 1,2 The feedback range and feedback bits of i need to be extended. For example, 1,1 = 0, 1, ..., N1O1-1 or 0, 1, ..., N1O1 / 2-1, and i 1,2 = 0, 1, ..., N2O2-1 or 0, 1, ..., N2O2 / 2-1.

[0357] For example, in embodiment AB, for 128 ports, New(N1,N2)=(16,4), Existing(N1,N2)=(8,2), New(N g1 ,N g2 In the case where (O1, O2) = (2, 2), if (O1, O2) = (4, 4) is assumed, as in the example of FIG. 25, the UE selects an SD beam from N1O1 × N2O2 = (16 × 4) × (4 × 4) = 64 × 16 SD beams based on the new (N1, N2), and defines the selected SD beam as (i 1,1 ,i 1,2 ) = (12,1).

[0358] However, other methods of reporting the selected SD beam are possible, considering setting a new (N1, N2) for the expansion port number based on the existing (N1, N2) for the existing port number.

[0359] <Embodiment AJ1> In an SD beam report for a specific new (N1, N2) setting, i for each rank 1,1 , i 1,2 The feedback range and feedback bits of are set to indicate the SD beam within multiple ports from the associated existing port CSI-RS resource and are based on the associated existing (N1, N2) value. To indicate the CSI-RS resource (port group) selected for that SD beam, 1,4 Additional feedback content may be introduced.

[0360] In this disclosure, i 1,4 may be represented by other indices, such as i x , i x,y , i x,y,z , or any other of the above. x, y, and z may be any integers.

[0361] At least one of the following options may be defined: ◆ Option 1: i 1,4 is an index. Its bit size is ceil(log2(N g1 N g2 )) is also possible. ◆ Option 2: i 1,4is a function of two indices (i 1,4,1 , i 1,4,2 ) and their bit sizes are ceil(log2(N g1 )) and ceil(log2(N g2 )) may be. If N g1 = 1 or N g2 If = 1, the corresponding feedback i 1,4,1 or i 1,4,2 The bit may be missing.

[0362] In the example of FIG. 26, for 128 ports, new (N1, N2) = (16, 4), existing (N1, N2) = (8, 2), new (N g1 ,N g2 In the case where (O1,O2) = (2,2), it is assumed that (O1,O2) = (4,4). In this example, (i 1,1 , i 1,2 ) = (12,1) indicates an SD beam selected from N1N2O1O2 SD beams (N1O1 × N2O2 = 32 × 8 SD beams) based on the existing (N1, N2) (for a certain layer). 1,4,1 ,i 1,4,2 ) = (0,0) is N g1 ×N g2 = 2 × 2 CSI-RS resources. One CSI-RS resource corresponds to N1N2O1O2 SD beams based on the existing (N1, N2). The association between the CSI-RS resource, the CSI-RS port index, and the antenna position of the new (N1, N2) may be based on embodiment AH. In this example, four CSI-RS resources correspond to four N1N2O1O2 antenna groups based on the existing (N1, N2), respectively. In this example, the UE selects an SD beam for the third CSI-RS resource.

[0363] (The SD beam for the first layer is the i 1,1 , i 1,2 , i 1,4 When displayed by i 1,3For the SD beams selected for different layers (determined via 1,1 +k1 or i 1,2 +k2 or i 1,1 + O1 or i 1,2 + For additional SD beams (for one or more other layers) determined from O2, i 1,1 ,i 1,2 is recognized as at least one of several options:

[0364] ◆ Option A: i from N1N2O1O2 SD beams based on new (N1, N2) 1,1 , i 1,2 In the example of Figure 27, for 128 ports, new (N1, N2) = (16, 4), existing (N1, N2) = (8, 2), new (N g1 ,N g2 In the case where (O1, O2) = (2, 2), it is assumed that (O1, O2) = (4, 4). In this example, the SD beams of the first layer are SD beams from N1N2O1O2 SD beams based on the new (N1, N2) according to embodiment AB (i 1,1 ,i 1,2 In this example, the SD beams of the other layers are represented by (i) = (12, 1). 1,1 ,i 1,2 + 2O2) = (12,1 + 8). In this example, the SD beam (i 1,1 ,i 1,2 ) to the SD beams of other layers. The offset from (N1, N2) to the SD beams of other layers may be represented by (0, 2O2) = (0, 8) in the N1N2O1O2 SD beams (N1O1 × N2O2 two-dimensional SD beams) based on the new (N1, N2).

[0365] ◆ Option B: i from N1N2O1O2 SD beams based on existing (N1, N2) 1,1 , i 1,2 The additional SD beams to be determined are i 1,4,1 , i 1,4,2Multiple SD beams for all layers may be selected from one and the same CSI-RS resource (N1N2O1O2 SD beams based on existing (N1,N2)). In the example of Figure 28, for 128 ports, new (N1,N2) = (16,4), existing (N1,N2) = (8,2), new (N g1 ,N g2 In the case where (O1,O2) = (2,2), it is assumed that (O1,O2) = (4,4). The association between the CSI-RS resource and the group of N1N2O1O2 antennas based on the existing (N1,N2) may be based on embodiment AH. In this example, four CSI-RS resources correspond to four groups of N1N2O1O2 antennas based on the existing (N1,N2), respectively. In this example, the UE selects an SD beam for the third CSI-RS resource. The selected CSI-RS resource or the selected group of N1N2O1O2 antennas based on the existing (N1,N2) is (i 1,4,1 ,i 1,4,2 In this example, the SD beam of the first layer indicates an SD beam from a group of N1N2O1O2 SD beams based on the existing (N1, N2) that corresponds to the third CSI-RS resource (i 1,1 ,i 1,2 In this example, the SD beams of the other layers are SD beams from the N1N2O1O2 SD beams based on the existing (N1, N2) in the same third CSI-RS resource (i 1,1 ,i 1,2 + 2O2) = (12,1). In this example, the SD beam (i 1,1 ,i 1,2 ) to the SD beams of other layers is indicated by (0, 202) in (N101 × N202 two-dimensional SD beams). In this example, the position (i 1,1 ,i 1,2 + 2O2) = (i 1,1mod N1O1, (i 1,2 + 2O2) mod N2O2) = (12 mod 64, 1 + 8 mod 8) = (12, 1).

[0366] ◆ Option C: i from N1N2O1O2 SD beams based on new (N1, N2) 1,1 , i 1,2 The additional SD beams to be determined are i 1,4,1 , i 1,4,2 The calculation of option C may be based on at least one of several options Cx below.

[0367] -◆ Option C1: The calculation is based on the location of multiple gNB antennas of new (N1, N2). In this option, the end result is the same as Option A. -◆ In the example of Figure 29, for 128 ports, new (N1, N2) = (16, 4), existing (N1, N2) = (8, 2), new (N g1 ,N g2 In the case where (O1,O2) = (2,2), it is assumed that (O1,O2) = (4,4). The association between the CSI-RS resources and the group of N1N2O1O2 antennas based on the existing (N1,N2) may be based on embodiment AH. In this example, four CSI-RS resources correspond to four groups of N1N2O1O2 antennas based on the existing (N1,N2). The CSI-RS resources selected for the first layer may be different from the CSI-RS resources selected for the other layers. In this example, the UE selects an SD beam in the third CSI-RS resource for the first layer. The selected CSI-RS resource or the selected group of N1N2O1O2 antennas based on the existing (N1,N2) is (i 1,4,1 ,i 1,4,2 In this example, the SD beam of the first layer indicates the SD beam (i) from a group of N1N2O1O2 SD beams based on the existing (N1,N2) that corresponds to the third CSI-RS resource. 1,1 ,i 1,2In this example, the SD beams of the other layers are SD beams (i 1,1 ,i 1,2 + 2O2) = (12,1 + 8). In this example, the SD beam (i 1,1 ,i 1,2 ) to the SD beams of other layers is indicated by (0,2O2) = (0,8) in N1N2O1O2 SD beams (N1O1 × N2O2 two-dimensional SD beams) based on the new (N1,N2).

[0368] -◆ Option C2: The calculation is based on the order of CSI-RS resources. -◆ In the example of Figure 30, for 128 ports, New (N1,N2) = (16,4), Existing (N1,N2) = (8,2), New (N g1 ,N g2 In the case where (O1,O2) = (2,2), it is assumed that (O1,O2) = (4,4). The association between the CSI-RS resources and the group of N1N2O1O2 antennas based on the existing (N1,N2) may be based on embodiment AH. In this example, four CSI-RS resources correspond to four groups of N1N2O1O2 antennas based on the existing (N1,N2). The CSI-RS resources selected for the first layer may be different from the CSI-RS resources selected for the other layers. In this example, the UE selects an SD beam in the third CSI-RS resource for the first layer. The selected CSI-RS resource or the selected group of N1N2O1O2 antennas based on the existing (N1,N2) is (i 1,4,1 ,i 1,4,2 In this example, the SD beam of the first layer indicates the SD beam (i) from a group of N1N2O1O2 SD beams based on the existing (N1,N2) that corresponds to the third CSI-RS resource. 1,1 ,i 1,2In this example, the SD beams of the other layers are SD beams (i 1,1 ,i 1,2 + 2O2) = (12,1). In this example, the SD beam (i 1,1 ,i 1,2 ) to the SD beams of other layers is shown by (0, 202) in the N1N20102 SD beams (N1O1 × N202 two-dimensional SD beams) based on the existing (N1, N2). In this example, the position (i 1,1 ,i 1,2 +2O2) is the (i 1,1 mod N1O1, (i 1,2 + 2O2) mod N2O2) = (12 mod 64, 1 + 8 mod 8) = (12, 1).

[0369] - Option C3: The calculation is based on the indexing order of the ports of the expansion port number. In this option, the final result may be determined by the association of the ports of the expansion port number with the base station antenna positions in embodiment AH.

[0370] <Supplement to embodiment AJ> The SD beam reporting method extended by embodiment AJ may be applied to an extension based on (Rel. 15) Type 1 single-panel CSI and an extension based on (Rel. 15) Type 1 multi-panel CSI.

[0371] Various SD beam reporting methods (e.g., SD beam reporting methods including at least one of embodiments AB and AJ) may be configurable by the NW depending on UE capabilities.

[0372] Various SD beam reporting methods (e.g., SD beam reporting methods including at least one of embodiment AB and embodiment AJ) may be applied to different cases. For example, the SD beam reporting method of embodiment AB may be applied to an extension based on (Rel. 15) Type 1 single-panel CSI, and the SD beam reporting method of embodiment AJ may be applied to an extension based on (Rel. 15) Type 1 multi-panel CSI. 1,4 may indicate the selected panel.

[0373] ((Embodiment AK)) <Study 1> i 1,1 , i 1,2 (Additionally, for some ranks, 1,3 Regarding the selection and reporting of an SD beam for a certain rank according to the above, embodiment AJ describes a method according to the association of CSI-RS resources, port indexes, and gNB antennas in embodiment AH. Embodiment AJ can be applied to a Type 1 single-panel codebook and a Type 1 multi-panel codebook (based on Rel. 15) when the number of SD beams L=1.

[0374] Embodiment AK considers a new method of SD beam reporting when L = 2, 4, or 6 SD beams are configured in the (Rel. 15) Type 2 codebook, the (Rel. 16) Extended Type 2 codebook, the (Rel. 16) Extended Type 2 PS codebook, and the (Rel. 17) Additional Extended Type 2 PS codebook.

[0375] L SD beams are 1,1 , i 1,2 For 128 ports, New(N1,N2) = (16,4), Existing(N1,N2) = (8,2), New(N g1 ,N g2 In the case where (O1, O2) = (2, 2), if (O1, O2) = (4, 4) and L = 4 are assumed, as in the example of Figure 31, 1,1 = [q1 q2], q1∈{0,1,...,O1-1}, q2∈{0,1,...,O2-1} may display / report / select beam groups. 1,2An existing (N1,N2) in ∈{0,1,...,C(N1N2,L)-1} may be extended to a new (N1,N2). 1,2 may display / report / select L=4 SD beams from the beam group.

[0376] In this disclosure, i 1,4 , i 1,5 may be represented by other indices, such as i x , i x,y , i x,y,z , or any other of the above. x, y, and z may be any integers.

[0377] Embodiment AK may be applied to cases where the total number of ports used for multiple existing port CSI-RS resources exceeds 32 (number of extended ports), or may be applied to cases where the total number of ports used for multiple existing port CSI-RS resources is 32 or less (number of existing ports).

[0378] <Embodiment AK1> A constraint may be defined or set in the specification that when reporting L SD beams for a certain new (N1, N2) value, all L beams are selected from the same existing port CSI-RS resource or the same port group based on the existing (N1, N2) value and the existing port CSI-RS resource associated with the new (N1, N2) value.

[0379] i 1,2 The feedback range and feedback bits of may be based on the associated existing (N1, N2) values. 1,2 ∈{0, 1,..., C(existing N1N2,L)−1}.

[0380] i 1,1 The feedback format of i may remain unchanged from Rel. 15 / 16 Type 2CB. 1,1 The size (number of bits) of may be related to (O1, O2) for a larger number of ports.

[0381] i 1,1may be [q1 q2], which indicates one beam group from O1O2 beam groups. One beam group may have N1N2 existing SD beams. 1,2 may be an index indicating L beams from one beam group (existing N1N2 SD beams).

[0382] Additional feedback content i indicating / reporting / selecting one selected (associated) CSI-RS resource (or one selected port group) for L SD beams 1,4 may be introduced. Its content may be based on at least one of the following options: ◆ Option 1: i 1,4 has one index, whose size is ceil(log2(N g1 N g2 )) is also possible. ◆ Option 2: i 1,4 is two indexes (i 1,4,1 ,i 1,4,2 ), whose sizes are ceil(log2(N g1 )) and ceil(log2(N g2 )) may also be used. g1 = 1 or N g2 If = 1, the corresponding feedback i 1,4,1 or i 1,4,2 The bit may be missing.

[0383] For 128 ports, new (N1,N2) = (16,4), existing (N1,N2) = (8,2), new (N g1 ,N g2 In the case of (O1, O2) = (2, 2), in the example of FIG. 32, when (O1, O2) = (4, 4), L = 4, option 2 is assumed, (i 1,4,1 ,i 1,4,2 ) is based on the association of embodiment AH, and N g1 ×N g2 = 2 × 2 CSI-RS resources #1 to #4, or one selected existing N1N2O1O2 = 8 × 2 × 4 × 2 antennas. 1,2denotes the L=4 SD beams based on the selected CSI-RS resources or the selected N1N2O1O2 existing antennas. In other words, the L=4 SD beams are restricted to the selected CSI-RS resources or the selected N1N2O1O2 existing antennas.

[0384] According to embodiment AK1, multiple SD beams based on the number of extended ports can be appropriately reported while reducing reporting overhead.

[0385] <Embodiment AK2> In reporting L SD beams for a certain new (N1, N2) value, each SD beam may be indicated / reported / selected by a combination of several of the following indexes: ◆i 1,4 The index may indicate the CSI-RS resource or port group to which the SD beam belongs. The size is ceil(log2(N g1 N g2 )) may also be used. 1,2 ∈{0, 1,..., existing N1N2-1}. Its index is i 1,4 It may indicate one SD beam from the existing N1N2 SD beams associated with the CSI-RS resource or port group indicated by

[0386] i 1,4 and i 1,2 L sets of i 1,1 may be used to represent the L SD beams, with

[0387] i 1,1 The feedback format of i may remain unchanged from Rel. 15 / 16 Type 2CB. 1,1 The size (number of bits) of may be related to (O1, O2) for a larger number of ports.

[0388] i 1,1 may be [q1 q2], which indicates one beam group from O1O2 beam groups. One beam group may have N1N2 existing SD beams. 1,2may be an index indicating one SD beam from one beam group.

[0389] For 128 ports, new (N1,N2) = (16,4), existing (N1,N2) = (8,2), new (N g1 ,N g2 In the case of (O1, O2) = (2, 2), when (O1, O2) = (4, 4) and L = 4 are assumed, in the example of FIG. 1,1 indicates a beam group containing new N1N2 = 16 × 4 SD beams. 1,4 and i 1,2 Each of the L=4 sets represents one SD beam. 1,4 is N g1 ×N g2 = 2 × 2 CSI-RS resources selected from CSI-RS resources #1 to #4, and i 1,2 is i 1,1 and the beam group selected by i 1,4 and the SD beam selected from the existing N1N2 = 8 × 2 SD beams based on.

[0390] According to embodiment AK2, multiple SD beams based on the number of extended ports can be appropriately reported without limiting CSI-RS resources.

[0391] Embodiment AK3 A constraint may be defined or configured in the specification that L SD beams reported for a new (N1, N2) value are selected from M existing port CSI-RS resources or M port groups based on the existing (N1, N2) values ​​and existing port CSI-RS resources associated with the new (N1, N2) value. For example, M∈{1, 2, ..., N g1 N g2} may also be used.

[0392] Additional feedback content i indicating / reporting / selecting one selected (associated) CSI-RS resource (or one selected port group) for L SD beams 1,4may be introduced. Its content may be based on at least one of the following options: ◆ Option 1: i 1,4 has M indexes. Each index may indicate one selected CSI-RS resource or one port group. The size of each index is ceil(log2(N g1 N g2 )) is also possible. ◆ Option 2: i 1,4 has one field to indicate the combination of M selected CSI-RS resources or M port groups. The size of the field is ceil(log2(C(N g1 N g2 ,M))) is also acceptable. ◆Option 3: i 1,4 is N g1 N g2 A bitmap with N bits. g1 N g2 The CSI-RS resource or port group may correspond to one of the CSI-RS resource or port groups, and may indicate whether the corresponding CSI-RS resource or port group is selected.

[0393] i 1,2 The feedback range and feedback bits may be based on at least one of several options:

[0394] ◆ Option A: The feedback range and feedback bits are based on M × existing N1N2 antennas. 1,4 The existing N1N2 antennas in the M antenna groups represented by i 1,2 The CSI-RS may be indexed according to at least one of a CSI-RS resource index, a port index, and a horizontal / vertical / polarization index for reporting. 1,2 ∈{0, 1,..., C(M × existing N1N2,L)-1}.

[0395] ◆ Option B: Similar to embodiment AK2, each SD beam may be represented / reported / selected by a combination of several of the following indices: - ◆ i 1,5 The index may indicate the CSI-RS resource or port group to which the SD beam belongs. The size may be ceil(log2(M)). 1,2 ∈{0, 1,..., existing N1N2-1}. Its index is i 1,5 may indicate one SD beam from the existing N1N2 SD beams associated with the CSI-RS resource or port group indicated by i. 1,4 and one value of i 1,1 With one value of and, i 1,5 and i 1,2 may be reported.

[0396] i 1,1 The feedback format of i may remain unchanged from Rel. 15 / 16 Type 2CB. 1,1 The size (number of bits) of may be related to (O1, O2) for a larger number of ports.

[0397] i 1,1 may be [q1 q2], which indicates one beam group from O1O2 beam groups. One beam group may have N1N2 existing beams. 1,2 may be an index indicating L beams from M beam groups (M × existing N1N2 beams).

[0398] For 128 ports, new (N1,N2) = (16,4), existing (N1,N2) = (8,2), new (N g1 ,N g2 In the case where (O1, O2) = (2, 2), (O1, O2) = (4, 4), L = 4, M = 2, Option 3, Option A are assumed. In the example of FIG. 34, i 1,1 indicates a beam group containing new N1N2 = 16 × 4 beams. 1,4 is N g1 ×N g2= 2 × 2 CSI-RS resources #1 to #4. In Option 3, i 1,4 is a bitmap "1010" indicating CSI-RS resources #1 and #3. In Option A, i 1,2 indicates L = 4 SD beams from M × existing N1N2 = 2 × 8 × 2 SD beams within CSI-RS resources #1 and #3.

[0399] The extended SD beam reporting method in embodiment AK may be applied to at least one of the (Rel. 15) Type 2 codebook, the (Rel. 16) extended Type 2 codebook, the (Rel. 16) extended Type 2 PS codebook, and the (Rel. 17) additional extended Type 2 PS codebook.

[0400] According to embodiment AK3, multiple SD beams based on the number of extended ports can be appropriately reported while reducing reporting overhead.

[0401] <Variations of Embodiment AK1 to Embodiment AK3> A plurality of SD beam reporting methods may be applied to a plurality of cases, for example, a plurality of codebook types, a plurality of numbers of extension ports (e.g., 48 / 64 / 72 / 96 / 128), a plurality of antenna configurations, existing (N1, N2) or new (N g1 ,N g2 ), multiple associations with the UE, multiple L values, multiple parameter combinations (paramCombinations), and multiple ranks. Multiple SD beam reporting methods may be configurable by the NW depending on UE capabilities.

[0402] <Study 2> Embodiment AK studies a new method of port reporting for (Rel. 17) Type 2 PS CB.

[0403] The precoding matrix indicated by the PMI is determined from L+M vectors, where L=K1 / 2 and K1=αP CSI-RS is.

[0404] L vectors v m^(i)(i=0,1,...,L-1) based on P CSI-RS K1 ports are selected from the vector v m^(i) is m=[m (0) ... [m (L-1) ], m (i) ∈{0,1,...,P CSI-RS / 2-1}. (i) is the index i 1,2 ∈{0,1,...,C(P CSI-RS / 2,L)-1}.

[0405] The L ports selected for each polarization are i 1,2 Reported by Existing P CSI-RS / 2 means the number of ports for one polarization.

[0406] <Embodiment AK0> (Rel. 15 / 16 / 17) In Type 2 PS CB, existing P CSI-RS (Number of existing ports) ∈ {4, 8, 12, 16, 24, 32} is supported. New P for extension based on Type 2 PS CB CSI-RS For (number of new ports) ∈ {48, 64, 72, 96, 128}, similar to embodiment AH, CSI-RS The association between the port index and the existing port CSI-RS resource within this port may be defined in the specification or may be configured.

[0407] The difference of Type 2CB from Type 2CB or Extended Type 2CB is that ports or CSI-RS resources do not need to be associated with gNB antenna locations. CSI reporting may be for selected ports. The gNB antenna structure may be transparent to the UE.

[0408] As shown in the example of FIG. 35, for Type 2 PS CB, CSI-RS And existing P CSI-RS And new N g An association between and may be supported / defined / established. In this example, one association is N g The first existing port CSI-RS resource corresponds to the first existing port CSI-RS resource.CSI-RS Ports are new P CSI-RS Port index for ports from 0 to existing ports CSI-RS -1. The second existing P CSI-RS Ports are new P CSI-RS Port index for the existing port CSI-RS From 2 x existing P CSI-RS Supports up to -1.

[0409] According to embodiment AK0, in the extension of the Type 2 PS CB, a port selected from the ports of the extension port number can be appropriately reported.

[0410] <Embodiment AK4> (Rel. 17) A new P in an extension based on Type 2 PS CB CSI-RS The L ports selected for the new P CSI-RS The existing P associated with CSI-RS Based on this, a constraint may be defined or set in the specification that all of the L ports are selected from the same existing port CSI-RS resource or the same port group.

[0411] i 1,2 The feedback range and feedback bits of CSI-RS It may be based on the value of i 1,2 ∈{0,1,...,C (existing P CSI-RS , L)−1}.

[0412] Additional feedback content i indicating / reporting / selecting one selected (associated) CSI-RS resource (or one selected port group) for L ports. 1,4 may be introduced.

[0413] According to embodiment AK4, in the extension of the Type 2 PS CB, L ports selected from the number of ports in the extension port number can be appropriately reported.

[0414] <Embodiment AK5> (Rel. 17) In an extension based on Type 2 PS CB, a new P CSI-RSEach port in the L ports selected for may be represented / reported / selected by a combination of some of the following indices: 1,4 The index may indicate the CSI-RS resource or port group to which the port belongs. The size is ceil(log2(N g )) may also be used. 1,2 ∈{0,1,..., existing P CSI-RS / 2-1}. The index is i 1,4 The existing P associated with the CSI-RS resource or port group indicated by CSI-RS / It may indicate one port out of two ports.

[0415] i 1,4 and i 1,2 may be used to represent the L ports.

[0416] According to embodiment AK5, in the extension of the Type 2 PS CB, L ports selected from the number of ports in the extension port number can be appropriately reported.

[0417] <Embodiment AK6> (Rel. 17) In an extension based on Type 2 PS CB, a new P CSI-RS The L ports selected for the new P CSI-RS The existing P associated with CSI-RS A constraint may be defined or set in the specification that all L ports are selected from M existing port CSI-RS resources or M port groups based on M∈{1, 2, ..., N g} may also be used.

[0418] Additional feedback content i indicating / reporting / selecting one selected (associated) CSI-RS resource (or one selected port group) for L ports. 1,4 may be introduced. Its content may be based on at least one of the following options: ◆ Option 1: i 1,4has M indexes. Each index may indicate one selected CSI-RS resource or one port group. The size of each index is ceil(log2(N g )) is also possible. ◆ Option 2: i 1,4 has one field to indicate the combination of M selected CSI-RS resources or M port groups. The size of the field is ceil(log2(C(N g ,M))) is also acceptable. ◆Option 3: i 1,4 is N g A bitmap with N bits. g The CSI-RS resource or port group may correspond to one of the CSI-RS resource or port groups, and may indicate whether the corresponding CSI-RS resource or port group is selected.

[0419] i 1,2 The feedback range and feedback bits may be based on at least one of several options:

[0420] ◆ Option A: The feedback range and feedback bit are M × existing P CSI-RS Based on antennas. 1,2 ∈{0,1,...,C(M×existing P CSI-RS / 2,L)-1}.

[0421] ◆ Option B: Similar to embodiment AK5, each port may be represented / reported / selected by a combination of several of the following indices: - ◆ i 1,5 The index may indicate the CSI-RS resource or port group to which the port belongs. The size may be ceil(log2(M)). 1,2 ∈{0,1,..., existing P CSI-RS / 2-1}. The index is i 1,5 The existing P associated with the CSI-RS resource or port group indicated by CSI-RSOne port from the number of ports may be displayed. 1,5 and i 1,2 may be reported.

[0422] According to embodiment AK6, in the extension of the Type 2 PS CB, L ports selected from the number of ports in the extension port number can be appropriately reported.

[0423] <Variations of Embodiments AK4 to AK6> In the Rel. 15 / 16 Type 2 PS CB, L ports are assigned for each polarization. 1,1 Selected by i 1,1 ∈{0,1,...,ceil(P CSI-RS / (2d))-1}.

[0424] Similar to embodiment AK4 / embodiment AK5 / embodiment AK6, the selected / associated existing P CSI-RS By considering L ports per polarization, L ports may be displayed.

[0425] A plurality of port reporting methods may be applied to a plurality of cases, such as a plurality of codebook types, a plurality of extension port numbers (e.g., 48 / 64 / 72 / 96 / 128), a plurality of antenna configurations, a plurality of existing P CSI-RS The port reporting method may be defined by at least one of multiple associations with , multiple L values, multiple parameter combinations (paramCombinations), and multiple ranks. The multiple port reporting methods may be configurable by the NW depending on the UE capabilities.

[0426] <Study 3> (Rel. 16) The parameter combination (paramCombination) setting in the extended type 2 CB is defined as shown in Figure 36. (Rel. 16) The paramCombination setting in the extended type 2 PS CB is defined as shown in Figure 37. (Rel. 17) The paramCombination setting in the additional extended type 2 PS CB is defined as shown in Figure 38.

[0427] Parameter settings of ranks 5 to 8 for more than 32 ports are considered. Parameter settings may vary depending on at least one of the codebook type, the number of ports, ranks 1 to 8, antenna configuration (N1, N2), and number of subbands N3, R. Even if the supported ranks are not extended for more than 32 ports, new values ​​may be considered for parameter settings.

[0428] <Embodiment AK7> In setting parameters / paramCombination for a codebook, specific values ​​of specific parameters may be supported / defined / set according to at least one of the following options: ◆ Option 1: Values ​​of L greater than the existing (extended type 2 CB / extended type 2 PS CB / additional extended type 2 PS CB) value (e.g., at least one of 8 and 10) are not supported. ◆ Option 2: p v ◆ Option 2: Values ​​other than the existing (Extended Type 2 CB / Extended Type 2 PS CB / Additional Extended Type 2 PS CB) values ​​of β (e.g., at least one of a value smaller than the existing value, a value larger than the existing value, 1 / 16, 3 / 4) are not supported. ◆ Option 3: Values ​​other than the existing (Extended Type 2 CB / Extended Type 2 PS CB / Additional Extended Type 2 PS CB) values ​​of β (e.g., at least one of a value smaller than the existing value, a value larger than the existing value, 1 / 8, 1 / 16, 7 / 8, 1) are not supported. ◆ Option 4: Values ​​other than the existing (Extended Type 2 CB / Extended Type 2 PS CB / Additional Extended Type 2 PS CB) values ​​of M (e.g., 3 / 4) are not supported. ◆ Option 5: Values ​​other than the existing (Extended Type 2 CB / Extended Type 2 PS CB / Additional Extended Type 2 PS CB) values ​​of α (e.g., at least one of 1 / 4, 1 / 8) are not supported.

[0429] A new paramCombination may be defined to take into account revisions to one or more of the aforementioned parameters. The new paramCombination may vary depending on at least one factor of the codebook type, the number of ports, the rank 1 to 8, the antenna configuration (N1, N2), the number of subbands N3, and R.

[0430] The value of the parameter / paramCombination may depend on the UE capabilities, which may be defined / reported per the value of its at least one factor.

[0431] According to embodiment AK7, in the extension of Type 2 CB / Type 2 PS CB, appropriate parameters can be set.

[0432] Supplement to embodiment AK The UE can support a two-dimensional arrangement of multiple antennas for 32 or fewer ports (e.g., existing (N1, N2)), a two-dimensional arrangement of multiple antennas for more than 32 ports (e.g., new (N1, N2)), and multiple groups of multiple antennas for more than 32 ports (e.g., new (N g1 ,N g2 ) or new N g ), a plurality of CSI-RS resources, and a CSI codebook. Based on the configuration, the UE may associate each CSI-RS resource with 32 or fewer ports, associate a plurality of CSI-RS resources with more than 32 ports, and determine a plurality of beams and one or more CSI-RS resources corresponding to the plurality of beams among the plurality of CSI-RS resources for reporting.

[0433] ((Embodiment AQ)) <Considerations> When a Type 1 single panel codebook is supported / configured for antenna configurations for more than 32 ports (n1-n2 or ng-n1-n2 or ng1-ng2-n1-n2), the codebook design may be the same as that of Rel. 15 Type 1 CSI. The existing codebook design for the existing CSI-RS is 1,1 , i 1,2 , i2 or i 1,1 , i 1,2 , i 1,3 , i2 and the number of bits of the feedback values. For larger N1O1 and N2O2 (new N1, N2 / new O1O2 / existing O1O2), the number of i for each rank is 1,1 , i1,2 The range of the feedback values ​​and the number of bits of the feedback values ​​may be expanded.

[0434] i 1,1 , i 1,2 The SD basis for one or more layers different from the layer of i is based on the existing type-1 codebook, 1,3 or may be defined in a specification. The design of SD bases for one or more different layers in a Type-1 codebook is more complicated than the structure of a Type-2 codebook, where a SD base common to multiple layers is reported directly. It is preferable to consider SD beam reporting for one or more different layers for more than 32 ports.

[0435] In embodiment AJ, in the SD beam report for a particular new (N1, N2) configuration, i for each rank 1,1 , i 1,2 The feedback range and feedback bits of are set to indicate the SD beam within multiple ports from the associated existing port CSI-RS resource and are based on the associated existing (N1, N2) value. To indicate the CSI-RS resource (port group) selected for that SD beam, 1,4 Additional feedback content may be introduced.

[0436] <Embodiment AQ1> Regarding SD beam reporting for multiple layers for a specific new (N1, N2) setting for more than 32 ports, embodiment AQ1 relates to SD beam selection for one polarization (e.g., one of horizontal polarization and vertical polarization).

[0437] i 1,1 , i 1,2 For this, at least one of several reporting methods may be used:

[0438] ◆ Method 1: This method is based on a Type 1 codebook. 1,1 = {0, 1, ..., N1O1-1}. 1,1 The size of i is log2(N1O1) bits. 1,2= {0, 1, ..., N2O2-1}. 1,2 The size of is log2(N2O2) bits. N1 and N2 may represent new(N1,N2) for more than 32 ports.

[0439] ◆ Method 2: This method is based on a type 2 codebook. 1,1 = [q1 q2], q1 = {0, 1, ..., O1-1}, q2 = {0, 1, ..., O2-1}. i 1,1 The size of i is log2(O1O2) bits. 1,2 = {0, 1, ..., N1N2-1}. 1,2 The size of is log2(N1N2) bits, where N1 and N2 may represent new(N1,N2) for more than 32 ports.

[0440] Method 3: This method is based on embodiment AJ. 1,1 , i 1,2 indicates the SD beam from the existing N1N2O1O2. i 1,4 may be based on at least one of the following options: Option 1: 1,4 is an index. Its size is ceil(log2(N g1 N g2 )) bits. -◆Option 2: i 1,4 is a function of two indices (i 1,4,1 , i 1,4,2 ) and their sizes are ceil(log2(N g1 )) bits and ceil(log2(N g2 )) bits. N1 and N2 may represent new (N1, N2) for more than 32 ports.

[0441] SD beam reporting for multiple layers may be based on at least one of the following options:

[0442] ◆Option 1: One SD beam common to multiple layers is i 1,1 , i 1,2 For all layers, (i 1,1 ,i1,2 ) may be reported.

[0443] ◆ Option 2: For each layer, an independent / separate SD beam is reported. For rank v, (i 1,1 ,i 1,2 ) may be reported.

[0444] ◆ Option 3: For each codeword (CW), an independent / separate SD beam is reported. If rank v is 4 or less, (i 1,1 ,i 1,2 ) may be reported, and if rank v is greater than 4, then (i 1,1 ,i 1,2 ) may be reported.

[0445] ◆ Option 4: Independent / separate SD beams are reported for every two layers. For example, the SD beams reported for every two layers may be the same SD beam for Layer 1 and Layer 2, the same SD beam for Layer 3 and Layer 4, etc. If the rank v is 2 or less, (i 1,1 ,i 1,2 ) may be reported, and if rank v is greater than 2 but less than or equal to 4, then (i 1,1 ,i 1,2 ) may be reported, and if rank v is greater than 4 but less than or equal to 6, then (i 1,1 ,i 1,2 ) may be reported, and if rank v is greater than 6 but less than or equal to 8, then (i 1,1 ,i 1,2 ) may be reported. Which layers have the same SD beam may be defined in the formula for the precoding matrix W for the specified codebook. This option allows for a balance between overhead and flexibility.

[0446] ◆ Option 5: In any of Options 1 to 4, there may be an additional constraint that the SD beams for one or more layers other than the first layer are selected within the same SD beam group (orthogonal SD beam group, group) as the first layer. The SD beam group is i 1,1 There may be N1N2 SD beams represented by [q1 q2]. One SD beam in the SD beam group is i 1,2 39, one SD beam group from the new N1N2O1O2 SD beams may be represented by i 1,1 = [1 1]. This selection may be based on at least one of the following examples:

[0447] -◆Example 1: When Method 2 is applied, the above options 2 to 4 may be rewritten as the following options 2a to 4a, respectively. -◆Option 2a: From the same SD beam group, independent / separate SD beams are reported for each layer. For rank v, i for the indication of the SD beam group 1,1 and for the representation of beams in groups v i 1,2 In the example of Figure 40, the rank v = 4 and one i representing one SD beam group 1,1 and v = 4 i, which respectively indicate v = 4 SD beams in the SD beam group. 1,2 , and are reported. --◆Option 3a: From the same SD beam group, an independent / separate SD beam is reported for each CW. If rank v is 4 or less, (i 1,1 ,i 1,2 ) may be reported, and if rank v is greater than 4, one i 1,1 and two i's 1,2and may be reported. --Option 4a: Independent / separate SD beams are reported for every two layers from the same SD beam group. For example, the SD beams reported for every two layers may be the same SD beam for layer 1 and layer 2, the same SD beam for layer 3 and layer 4, etc. One i for displaying the SD beam group 1,1 If the rank v is less than or equal to 2, then one i 1,2 may be reported, and if the rank v is greater than 2 but less than or equal to 4, then two i 1,2 may be reported, and if rank v is greater than 4 but less than or equal to 6, then three i 1,2 may be reported, and if rank v is greater than 6 but less than or equal to 8, then four i 1,2 may be reported.

[0448] -◆Example 2: When Method 1 is applied, the above options 2 to 4 may be rewritten as the following options 2b to 4b, respectively. -◆Option 2b: Independent / separate SD beams are reported for each layer within the same SD beam group. For rank v, (i 1,1 ,i 1,2 ) and v-1 i for the other layers. new and may be reported. i for each layer other than layer 1 new may refer to an SD beam in the same SD beam group as the SD beam in layer 1. new The size of may be log2(N1N2) bits. Option 3b: Independent / separate SD beams are reported for each CW from the same SD beam group. If rank v is 4 or less, (i 1,1 ,i 1,2 ) for the first CW may be reported if the rank v is greater than 4. 1,1 ,i 1,2 ) and one set of i for the second CW new and may be reported. new may refer to an SD beam in the same SD beam group as the SD beam for the first CW.new The size of may be log2(N1N2) bits. Option 4b: Independent / separate SD beams are reported for every two layers from the same SD beam group. For example, the SD beams reported for every two layers may be the same SD beam for Layer 1 and Layer 2, the same SD beam for Layer 3 and Layer 4, etc. One i for indicating the SD beam group 1,1 may be reported for Layer 1 and Layer 2. 1,1 ,i 1,2 ) may be reported, and if the rank v is greater than 2 but less than or equal to 4, one set of i for one or more layers other than layer 1 and layer 2 may be reported. new may be reported, and if the rank v is greater than 4 but less than or equal to 6, two i new may be reported, and if the rank v is greater than 6 but less than or equal to 8, three i for multiple layers other than layer 1 and layer 2 new may be reported. new For two layers other than Layer 1 and Layer 2, may refer to an SD beam in the same SD beam group as the SD beam for Layer 1 and Layer 2. new The size of may be log2(N1N2) bits.

[0449] - Variation 1: The "within the same SD beam group" constraint can be applied per CW or per two layers. 1,1 or the number of i reported using Method 1 new The number of SD beam groups may be different from the example in Option 5. If there are X SD beam groups, then i 1,1 X sets of may be reported.

[0450] -◆Variation 2: Which layer's SD beams have the "within the same SD beam group" constraint may be defined in the formula for the precoding matrix W for the specified codebook.

[0451] According to embodiment AQ1, for certain new (N1, N2) configurations for more than 32 ports, the UE can properly report SD beams for multiple layers.

[0452] <Embodiment AQ2> Embodiment AQ2 relates to the relationship between SD beams between two polarized waves.

[0453] When SD beam selection is performed for multiple layers of one polarization (first polarization, e.g., one of horizontal polarization and vertical polarization) based on embodiment AQ1, SD beam selection for another polarization (second polarization, e.g., the other of horizontal polarization and vertical polarization) may be based on at least one of the following options.

[0454] ◆ Option 1: No inter-polarization co-phasing is used and the same SD beam as the first polarization is selected / reported for the second polarization.

[0455] ◆ Option 2: Using a common inter-polarization phase adjustment for all layers, the same SD beam as the first polarization is selected / reported for the second polarization. One inter-polarization phase adjustment is reported.

[0456] ◆ Option 3: Using layer-specific inter-polarization phase adjustments, the same SD beam as the first polarization is selected / reported for the second polarization. For rank v, v inter-polarization phase adjustments are reported.

[0457] ◆ Option 4: Using the CW-specific inter-polarization phase adjustment, the same SD beam as the first polarization is selected / reported for the second polarization. If rank v is less than or equal to 4, one inter-polarization phase adjustment is reported. If rank v is greater than 4, two inter-polarization phase adjustments are reported.

[0458] ◆Option 5: A common inter-polarization phase adjustment is used for each of the two layers, and the same SD beam as the first polarization is selected / reported for the second polarization.

[0459] ◆Option 6: An independent / separate SD beam is selected / reported for the second polarization (based on embodiment AQ1).

[0460] ◆ Variation: Which layers have the same phase alignment across polarizations may be defined in the formula for the precoding matrix W for a specific codebook.

[0461] The precoding matrix W based on the type 1 codebook structure may be given by the following equation L1:

[0462] v can be a rank. j can be a layer. i 1,1,j and i 1,2,j may denote the SD beam for layer j. n,j may denote the cross-polarization phase adjustment for layer j.

[0463] In embodiment AQ1 / embodiment AQ2, if different options are applied, v_i 1,1,j ,i 1,2,j and φ n,j may be the same for different layers, may be different for different layer j, may be reported by the UE for different layer j, or may be defined in the formula for the precoding matrix W for the specified codebook for different layer j.

[0464] According to embodiment AQ2, for certain new (N1, N2) configurations for more than 32 ports, the UE can properly report SD beams for multiple polarizations and multiple layers.

[0465] ((Embodiment AW)) <Discussion> For at least RI=1 to 4, an extended CB structure for more than 32 ports based on Type 1 CB is considered to be based on at least one of the following schemes. ◆ Scheme 1 (Baseline): The extended CB structure uses a direct extension based on the existing Type 1 CB for two codebook modes and two CB structures for ranks 3 to 4. 2N1N2 (>32) is the total number of CSI-RS ports across the aggregated NZP CSI-RS resources. ◆ Scheme 2: The extended CB structure uses L=1 layer-specific SD beams with layer-specific inter-polarization M-PSK phase adjustment (M∈{2, 4, 8, 16}). New (N1, N2) are added. 2N1N2 (>32) is the total number of CSI-RS ports across the aggregated NZP CSI-RS resources. ◆ Scheme 2B: SD beam selection is the same as Scheme 2. The extended CB structure considers both amplitude and phase scaling for W2. ◆ Scheme 3: The extended CB structure reuses the SD basis of the existing (Rel. 16) extended type 2 CB using L > 1 SD basis. New (N1, N2) are added. 2N1N2 (> 32) is the total number of CSI-RS ports across the aggregated NZP CSI-RS resources. ◆ Scheme 4: The extended CB structure uses the existing (N1, N2) values ​​for each NZP CSI-RS resource to obtain the PMI for each NZP CSI-RS resource, and combines the K PMIs through phase adjustment between the NZP CSI-RS resources. ◆ Scheme 5: The first SD beam is the same as the existing CB. The second SD beam is selected from the set of (N1-1)N2O2 + (N2-1)N1O1 - (N1-1)(N2-1) orthogonal beams. A new (N1,N2) is added. 2N1N2 (>32) is the total number of CSI-RS ports across the aggregated NZP CSI-RS resources. ◆ Scheme 6: It is unclear whether the extended CB structure belongs to a single SD beam per layer or multiple SD beams per layer. A new (N1,N2) is added. 2N1N2 (>32) is the total number of CSI-RS ports across the aggregated NZP CSI-RS resources.

[0466] In CB designs for RI=5 to 8 in an extended CB for more than 32 ports based on Type 1 CB, CB designs with low complexity for RI=5 to 8 based on RI=1 to 4 have not been thoroughly studied. Embodiment AJ is consistent with Scheme 1. Embodiment AQ is consistent with Scheme 2.

[0467] <Embodiment AW0> One of methods 1 to 6, embodiment AJ, and embodiment AQ may be applied to any RI, including RI=5 to 8.

[0468] In this case, a uniform CB structure may be applied to any RI from 1 to 8.

[0469] As an example of when Scheme 2 is applied, even when RI≧5, L=1 SD basis vectors (SD bases, SD beams) may be selected independently for multiple layers, and layer-specific inter-polarization M-PSK phase adjustment may be applied. Furthermore, selection of a common SD basis vector for a pair of layers and layer multiplexing via orthogonal polarization phase adjustment for a pair of layers having a common SD basis vector may be applied to RI=5 to 8, as well as RI=1 to 4. Such additional schemes may be applied only to specific ranks / layers.

[0470] As an example of a case where embodiment AQ is applied, SD basis vector (SD basis, SD beam) selection may be applied for any RI per layer / every two layers / per CW / per all layers, and inter-polarization phase adjustment may be applied for any RI per layer / every two layers / per CW / per all layers. When RI=3, 5, or 7, if SD beam selection for every two layers is applied, the specifications may define which two layers have the same SD beam. For example, when RI=3, the specifications may define that the first and second layers have the same SD beam, or that the second and third layers have the same SD beam, or that the first and third layers have the same SD beam.

[0471] Freely selecting vectors for multiple layers independently, without further constraints on the layers, may mean selecting one vector out of N1*N2*O1*O2 vectors for each layer.

[0472] Using the constraint of orthogonal SD basis vectors, vectors are selected independently for multiple layers, which may mean that the SD basis vectors selected for multiple layers are orthogonal. In the example of Figure 41, 64 ports, new (N1, N2) = (8, 4), (O1, O2) = (4, 4) are used. In this example, the SD basis vectors (i 1,1,i ,i 1,2,i ) = (n1*N1+q1,n2*N2+q2) = (1,5) (n1∈{0,1,...,N1-1}, n2∈{0,1,...,N2-1}, q1∈{0,1,...,O1-1}, q2∈{0,1,...,O2-1}) are selected. There are O1*O2=32 orthogonal SD basis vector groups (orthogonal vector groups) in total. Each orthogonal SD basis vector group contains N1*N2=16 SD basis vectors. The orthogonal SD basis vector group containing the SD basis vectors for the first layer is (i 1,1,i ,i 1,2,i ) = (n1 * N1 + 1, n2 * N2 + 1), (q1, q2) = (1, 1). The orthogonal SD basis vector constraint in this case may be that the SD basis vectors for other layers are selected from the orthogonal SD basis vector group.

[0473] According to embodiment AW0, the UE can report the appropriate CB for rank / RI greater than 4 as an extended CB for more than 32 ports based on Type 1 CB.

[0474] <Embodiment AW1> For RI=1 to 4 and RI=5 to 8, independently, one of methods 1 to 6, embodiment AJ, and embodiment AQ may be applied.

[0475] There may be two sets of feedback contents: a first set for layers 1 to 4 and a second set for layers 5 and above. The first set may include one PMI (W 1,RI=4 , first precoding matrix, first PMI). The second set may be considered as one PMI (W 2,RI=v-4 , second precoding matrix, second PMI). The structure of the second PMI may be different from the structure of the first PMI.

[0476] Two PMIs may be reported within one CSI report. The precoding matrix W for generating two PMIs for rank v (v≧5) may be given by the following equation M1: 1 / sqrt(vP CSI-RS )*[W 1,RI=4 W 2,RI=v-4 ] (M1)

[0477] The two PMIs may or may not report amplitude (amplitude ratio). The two PMIs may or may not report phase adjustment. Whether the two PMIs report amplitude or phase adjustment may be defined in the specification, configured by RRC, or based on UE capability reporting.

[0478] At least one of the amplitude and phase adjustments may be common to multiple polarizations or polarization-specific. Whether at least one of the amplitude and phase adjustments is common to multiple polarizations or polarization-specific may be defined in a specification, configured by RRC, or based on a UE capability report.

[0479] The precoding matrix W for rank v (v≧5) when there is a common polarization amplitude p for layers 1 to 4 and layers 5 and above, and a common polarization phase adjustment φ for layers 1 to 4 and layers 5 and above may be expressed as the following equation M2: 1 / sqrt(vP CSI-RS )*[W 1,RI=4 pφW 2,RI=v-4] (M2)

[0480] Polarization-specific amplitudes p of layers 5 and above for layers 1 to 4 (1) ,p (2) and the polarization-specific phase adjustment φ of layers 5 and above relative to layers 1 to 4. (1) ,φ (2) When there are and , the precoding matrix W for rank v may be expressed as the following equation M3: where (1) and (2) represent the first polarization and the second polarization, respectively.

[0481] A difference between embodiment AW0 and embodiment AW1 may be that the PMI for layers 5 and above is independent of the PMI for layers 4 and below. For example, in embodiment AW0, when multiple SD beams for multiple layers comply with orthogonal vector group constraints, the SD beams for layers 5 and above may be in the same orthogonal vector group as the SD beams for layers 4 and below. In embodiment AW1, the orthogonal vector group constraints may be applied independently to layers 4 and below and to layers 5 and above. That is, the SD beams for layers 4 and below may be orthogonal to each other, and the SD beams for layers 5 and above may be orthogonal to each other, and the SD beams for layers 4 and below and the SD beams for layers 5 and above may belong to two orthogonal vector groups, respectively.

[0482] According to embodiment AW1, the UE can report the appropriate CB for rank / RI greater than 4 as an extended CB for more than 32 ports based on Type 1 CB.

[0483] <Embodiment AW2> For RI=1 to 4, one of Schemes 1 to 6, Embodiment AJ, and Embodiment AQ may be applied. For RI=5 to 8, a low-complexity CB design based on feedback for Layers 1 to 4 for RI=1 to 4 may be applied. The information size of feedback (PMI) for any of Layers 5 to 8 may be smaller than the information size of feedback (PMI) for any of Layers 1 to 4. SD basis vector selection may be based on at least one of the following options:

[0484] ◆ Option 1: No separate (separate from layers 1 to 4) SD basis vector selection / reporting for layers 5 to 8. This option may be based on at least one of several options 1-x below.

[0485] --◆Option 1-1: The SD basis vectors selected for layers 1 to 4 are applied directly to layers 5 to 8 based on the rule between layers i and j. The rule may be based on at least one of the following rules: --◆For example, the specification may define that the SD basis vectors selected for layer i (1≦i≦4) are applied to layer j=i+4. --◆For example, the specification may define that the SD basis vectors selected for layer 1 are applied to layers 5 to 6, and the SD basis vectors selected for layer 2 are applied to layers 7 to 8. --◆Other rules for mapping between layers i and j may be defined in the specification.

[0486] -◆Option 1-2: An orthogonal SD basis vector group based on the SD basis vector selected for layer i (1≦i≦4) is applied to layer j (5≦j≦8) based on a rule. In other words, from the orthogonal SD basis vector group including the SD basis vector selected for layer i, an SD basis vector for layer j is selected based on a rule. The rule may be based on at least one of the following several rules: -◆For example, if the SD basis vector selected for layer i is (i 1,1,i,i 1,2,i ), then the SD basis vectors selected for layer j are (i 1,1,i +O1,i 1,2,i ) or (i 1,1,i ,i 1,2,i +O2) or (i 1,1,i +O1,i 1,2,i +O2) or (i 1,1,i +2O1,i 1,2,i ) or (i 1,1,i ,i 1,2,i +2O2) or (i 1,1,i +2O1,i 1,2,i +2O2), etc. The mapping between i and j may be defined in the specification.

[0487] -◆In option 1, there is no additional feedback overhead for SD basis vectors for layers 5 to 8.

[0488] In the following example of option 1, 64 ports are assumed, as shown in Figure 42, with new (N1, N2) = (8, 4) and (O1, O2) = (4, 4). In this example, the SD basis vectors selected for layer i = 1 are (i 1,1,i ,i 1,2,i ) = (1,5).

[0489] -◆ Option 1-1 is used in the example of Figure 43. In this example, the SD basis vectors selected for layer j=5 are the same as the SD basis vectors selected for layer i=1.

[0490] In the example of Figure 44, option 1-2 is used. In this example, the SD basis vectors selected for layer j=5 are the same as the SD basis vectors selected for layer i=1 (i 1,1,i ,i 1,2,i ) based on (i 1,1,i +O1,i 1,2,i )

[0491] - In the formula L1 in the embodiment AQ, when different choices / options in the embodiments AW1 and AW2 are applied, for different layers j, vi_1,1,j, i_1,2,j and φ n,jmay be the same or different.

[0492] Based on equation L1, the precoding matrix W for RI=5 when option 1-1 is applied may be given by the following equation M4:

[0493] Based on equation L1, the precoding matrix W for RI=8 when option 1-1 is applied may be given by the following equation M5:

[0494] Based on equation L1, the precoding matrix W for RI=5 when option 1-2 is applied may be given by the following equation M6:

[0495] Based on equation L1, the precoding matrix W for RI=8 when option 1-2 is applied may be given by the following equation M7:

[0496] ◆ Option 2: There is separate selection / reporting of SD basis vectors for layers 5 to 8 (separate from layers 1 to 4). The difference between the SD basis vector selection for layers 5 to 8 and that for layers 1 to 4 is that constraints for layers 5 to 8 are taken into account to reduce feedback overhead. There is additional feedback overhead required for the SD basis vectors for layers 5 to 8, but due to the constraints applied, it is smaller than the feedback overhead for layers 1 to 4. This option may be based on at least one of several options 2-x below.

[0497] -◆Option 2-1: (If free SD basis vector selection for layers 1 to 4 is adopted) The SD basis vector (i 1,1,i ,i 1,2,i), the constraints of the orthogonal SD basis vector group are considered for layers 5 to 8. In this case, the number of candidates for SD basis vectors selected for layers 5 to 8 from the orthogonal SD basis vector group, excluding the SD basis vector selected for layer i, is N1*N2-1.

[0498] -◆Option 2-2: (When free SD basis vector selection for layers 1 to 4 is adopted, or when orthogonal SD basis vector selection for layers 1 to 4 is adopted) The SD basis vector (i 1,1,i ,i 1,2,i ), a certain number of closest orthogonal SD basis vectors are considered for selection for layers 5 to 8. For example, the orthogonal SD basis vector candidates selected for layer j are three candidates (i 1,1,i +O1,i 1,2,i ), (i 1,1,i ,i 1,2,i +O2), (i 1,1,i +O1,i 1,2,i +O2). The orthogonal SD basis vector candidates may have other indices / numbers / positions.

[0499] -◆Option 2-3: (If free SD basis vector selection for layers 1 to 4 is adopted) For layers 5 to 8, the SD basis vector (i 1,1,i ,i 1,2,i ) other constraints on the SD basis vectors are considered, considering both orthogonal and non-orthogonal SD basis vectors. For example, an extended set of orthogonal SD basis vectors can be candidates for selecting SD basis vectors. The number of candidates may be (N1-1)N2O2 + (N2-1)N1O1 - (N1-1)(N2-1).

[0500] ◆ Variation: For layers 5 to 8, other constraints in embodiment AQ may be applied. For example, SD basis vectors are selected every two layers / every four layers / every CW. For j (5≦j≦8) defined in the specification, the SD basis vectors for layer j may be based on the SD basis vectors for another layer k (5≦k≦8). Candidates for selecting SD basis vectors for layer j may be based on the SD basis vectors for another layer k (5≦k≦8).

[0501] For multiple RIs or multiple layers, different options may be applied.

[0502] In the following Option 2 example, as in the previous Option 1 example, 64 ports are assumed, with new (N1,N2) = (8,4), (O1,O2) = (4,4). In this example, the SD basis vectors selected for layer i=1 are (i 1,1,i ,i 1,2,i ) = (1,5).

[0503] Option 2-1 is used in the example of Fig. 45. In this example, an SD basis vector for layer j=5 is selected from N1*N2-1 SD basis vectors excluding the SD basis vector selected for layer i=1, out of an orthogonal SD basis vector group including N1*N2 SD basis vectors including the SD basis vector selected for layer i=1.

[0504] 46, option 2-2 is used. In this example, an SD basis vector for layer j=5 is selected from three SD basis vectors near the SD basis vector selected for layer i=1 in an orthogonal SD basis vector group including N1*N2 SD basis vectors including the SD basis vector selected for layer i=1. Candidates for the SD basis vector selected for layer j=5 may have indexes / numbers / positions different from the indexes / numbers / positions in this example.

[0505] 47, option 2-3 is used. In this example, SD basis vectors for layer j=5 are selected from an orthogonal SD basis vector group containing N1*N2 SD basis vectors, including the SD basis vector selected for layer i=1, and non-orthogonal SD basis vectors obtained by first-dimensional rotation and second-dimensional rotation of the orthogonal SD basis vector group. The number of SD basis vector candidates selected for layer j=5 is calculated as follows: "number of (orthogonal and non-orthogonal) SD basis vectors obtained by first-dimensional rotation" + "number of (orthogonal and non-orthogonal) SD basis vectors obtained by second-dimensional rotation" - "number of orthogonal SD basis vectors overlapping between first-dimensional rotation and second-dimensional rotation" = 7*16 + 3*32 - 21 = 187.

[0506] In the following example variation, 64 ports, new (N1, N2) = (8, 4), (O1, O2) = (4, 4) are assumed, as in the example of Figure 48. In this example, the SD basis vectors selected for layer k = 5 based on any of the options of embodiment AW2 are (i 1,1,i ,i 1,2,i ) = (1,5).

[0507] 49, option 1-1 is used. In this example, the SD basis vectors selected for layer j=6 are the same as the SD basis vectors selected for layer k=5.

[0508] In the example of Figure 50, option 1-2 is used. In this example, the SD basis vectors (i 1,1,i ,i 1,2,i ), the SD basis vectors selected for layer j=6 are (i 1,1,i +O1,i 1,2,i )

[0509] In the example of Figure 51, option 2-1 is used. In this example, the SD basis vectors (i 1,1,i ,i 1,2,iOf the orthogonal SD basis vector group containing N1*N2 SD basis vectors including (N1*N2), the SD basis vector for layer j=6 is selected from N1*N2-1 SD basis vectors excluding the SD basis vector selected for layer k=5.

[0510] 52, option 2-2 is used. In this example, an SD basis vector for layer j=6 is selected from three SD basis vectors near the SD basis vector selected for layer k=5 in an orthogonal SD basis vector group including N1*N2 SD basis vectors, including the SD basis vector selected for layer k=5. The candidates for the SD basis vector selected for layer j=5 may have indexes / numbers / positions different from the indexes / numbers / positions in this example.

[0511] 53, option 2-3 is used. In this example, SD basis vectors for layer j=6 are selected from an orthogonal SD basis vector group containing N1*N2 SD basis vectors, including the SD basis vector selected for layer k=5, and non-orthogonal SD basis vectors obtained by first-dimensional rotation and second-dimensional rotation of the orthogonal SD basis vector group. The number of SD basis vector candidates selected for layer j=6 is calculated as follows: "number of (orthogonal and non-orthogonal) SD basis vectors obtained by first-dimensional rotation" + "number of (orthogonal and non-orthogonal) SD basis vectors obtained by second-dimensional rotation" - "number of orthogonal SD basis vectors overlapping between first-dimensional rotation and second-dimensional rotation" = 7*16 + 3*32 - 21 = 187.

[0512] According to embodiment AW2, the UE can reduce the complexity / overhead of SD basis vectors in extended CBs for more than 32 ports based on Type 1 CB for ranks / RIs greater than 4.

[0513] <Embodiment AW3> For RI = 1 to 4, one of Schemes 1 to 6, Embodiment AJ, and Embodiment AQ may be applied. For RI = 5 to 8, a low-complexity CB design based on feedback for Layers 1 to 4 for RI = 1 to 4 may be applied. The information size of feedback (PMI) for any of Layers 5 to 8 may be smaller than the information size of feedback (PMI) for any of Layers 1 to 4. The information size of phase adjustment for any of Layers 5 to 8 may be smaller than the information size of phase adjustment for any of Layers 1 to 4. Inter-polarization co-phasing may be based on at least one of the following options:

[0514] ◆ Option 1: No separate (separate from layers 1 to 4) inter-polarization phase adjustment reporting for layers 5 to 8. This option may be based on at least one of several options 1-x below.

[0515] -◆Option 1-1: The inter-polarization phase adjustment for layers 5 to 8 is defined in the specification as a fixed value. For example, the fixed value is +1, -1, etc.

[0516] - Option 1-2: The inter-polarization phase adjustment reported to layers 1 to 4 is applied directly to layers 5 to 8 based on the rule between layers i and j. The rule may be obtained by replacing the SD basis vector with the inter-polarization phase adjustment in option 1-1 of embodiment AW2.

[0517] - Option 1-3: The inter-polarization phase adjustment reported to layers 1 to 4 is applied to layers 5 to 8 using an additional phase adjustment, which may be defined in the specification, configured by RRC, or based on UE capability reporting.

[0518] ◆ Option 2: Separate inter-polarization phase adjustments (separate from layers 1 to 4) are reported for layers 5 to 8. The difference between layers 5 to 8 and layers 1 to 4 may be that the granularity of the inter-polarization phase adjustments for layers 5 to 8 is coarser than that for layers 1 to 4 (i.e., the number of quantization levels for the inter-polarization phase adjustments for layers 5 to 8 is smaller than that for layers 1 to 4). In this case, the overhead of the inter-polarization phase adjustments for layers 5 to 8 is lower than that of the inter-polarization phase adjustments for layers 1 to 4. For example, if M-PSK phase adjustments are defined for layers 1 to 4, where M is one of {2, 4, 8, 16}, then N-PSK phase adjustments may be defined for layers 5 to 8, where N≦M. For example, M=8 and N=4. For example, M=4 and N=2.

[0519] ◆ Option 3: A combination of Option 1 and Option 2. In addition to the rules in Option 1, reporting of additional inter-polarization phase adjustments for layers 5 to 8 may be supported.

[0520] Based on Equation L1, the precoding matrix W for RI=v (5≦v≦8) when Option 1-1 is applied may be given by the following Equation M8: where the cross-polarization phase adjustment φ for layer j (5≦j≦8) is n,j is a fixed value [+1 -1 +1 -1].

[0521] Based on Equation L1, the precoding matrix W for RI=8 when Option 1-2 is applied may be given by the following Equation M9: where the cross-polarization phase adjustment φ for Layer i+4 (1≦i≦4) is n,i+4 is the inter-polarization phase adjustment φ for layer i (1 ≤ i ≤ 4) n,i is the same as

[0522] Based on Equation L1, the precoding matrix W for RI=5 when options 1-3 are applied may be given by the following Equation M10: where the cross-polarization phase adjustment for layer i+4 (1≦i≦4) is the cross-polarization phase adjustment φ for layer i (1≦i≦4). n,i are obtained by multiplying the phases by additional phase adjustments [+1 -1 +1 -1] respectively.

[0523] Based on Equation L1, the precoding matrix W for RI=8 when Option 2 is applied may be given by the following Equation M11: where the cross-polarization phase adjustment θ for layer j (5≦j≦8) is n,j The granularity of is the inter-polarization phase adjustment φ for layer i (1≦i≦4). n,i Coarser than the grain size of

[0524] Based on Equation L1, the precoding matrix W for RI=8 when Option 1-2 and Option 2 are applied may be given by the following Equation M12: where the cross-polarization phase adjustment φ for Layer i+4 (1≦i≦4) is n,i+4 is the inter-polarization phase adjustment φ for layer i (1 ≤ i ≤ 4) n,i The additional (φ n,i (multiplied by) Inter-polarization phase adjustment θ n,j The granularity of is the inter-polarization phase adjustment φ for layer i (1≦i≦4). n,i Coarser than the grain size of

[0525] According to embodiment AW3, the UE can reduce the complexity / overhead of cross-polarization phase adjustment in extended CB for more than 32 ports based on Type 1 CB for rank / RI greater than 4.

[0526] <Variations of Embodiment AW2 and Embodiment AW3> Embodiment AW2 and embodiment AW3 may be applied simultaneously. A combination of a specific option in embodiment AW2 and a specific option in embodiment AW3 may be applied. The specific option in embodiment AW2 may be a different type of option from the specific option in embodiment AW3.

[0527] No additional feedback may be required for layers 5 to 8. PMIs for layers 5 to 8 may be derived based on feedback for layers 1 to 4. Rules for the relationship between CBs for layers 1 to 4 and CBs for layers 5 to 8 may be defined in the specification.

[0528] <Variations of Embodiment AW1 and Embodiment AW2 / Embodiment AW3> Based on embodiment AW2 / Embodiment AW3, there may or may not be additional feedback for the second PMI for layers 5 to 8.

[0529] No additional feedback may be required for layers 5 to 8. PMIs for layers 5 to 8 may be derived based on feedback for layers 1 to 4. Rules for the relationship between CBs for layers 1 to 4 and CBs for layers 5 to 8 may be defined in the specification.

[0530] In addition to embodiment AW2 / embodiment AW3, at least one of a common polarization amplitude or a polarization-specific amplitude and a phase adjustment for two PMIs (between layers 1 to 4 and layers 5 to 8) may be fed back.

[0531] <Supplement to embodiment AW> Which embodiment / option is applied, which embodiment / option is configured by RRC, and which embodiment / option is reported as UE capability may be common to all supported existing port number / new port number / (N1, N2) configurations.

[0532] Which embodiment / option applies, which embodiment / option is configured by RRC, and which embodiment / option is reported as UE capability may be individual for the number of existing ports / number of new ports / (N1, N2) configuration.

[0533] Other values ​​of (O1,O2) may be applied, for example, (O1,O2) = (2,2), (1,4), (4,1), or (1,1).

[0534] ((Embodiment CZ)) <Type 2CB> In Type 2CB, i 1,2 is given as above (Type 2 codebook) and denotes the combination of L SD beams from N1 * N2 SD beams, where C(x,y) is the sum of L SD beams for x ≥ y. x C y , 0 for x<y and is given by table C1 (FIG. 54).

[0535] The elements of n1 and n2 are calculated using the following algorithm (i 1,2 Decryption) is used to 1,2 It can be obtained from s －1 =0 ◆For i=0,...,L-1, ―◆i 1,2 -s i-1 ≧C(x * ,Li) * Find ∈{L-1-i,...,N1N2-1-i}. -◆e i =C(x * ,Li) ―◆s k =s i-1 +e i ―◆n (i) =N1N2-1-x * ―◆n1 (i) =n (i) mod N1 ―◆n2 (i) =(n (i) -n1 (i) ) / N1

[0536] If n1 and n2 are known, then i 1,2 is the following algorithm (i 1,2 n (i)=N1n2 (i) +n1 (i) -◆Here, as i increases, n (i) Indices i=0,1,...,L-1 are assigned so that i increases. 1,2 =Σ i=0 L-1 C(N1N2-1-n (i) , Li) -◆ where C(x,y) is given by the above-mentioned table C1.

[0537] <Extended Type 2CB> (Rel. 16) Extended Type 2CB supports L=6, FD basis selection for Mv subbands out of N3 subbands, and a larger table C2 (Figure 55) for the combination coefficients C(x,y). 1,2 The encoding and decoding algorithms are the same as those of Type 2 CB.

[0538] <Additional Extended Type 2PS CB> As mentioned above, in the (Rel. 17) additional extended type 2PS CB, 1,2 ∈{0,1,...,C(P CSI-RS / 2,L)-1}. That is, i 1,2 is P CSI-RS The combination of selecting L ports from / 2 ports is shown.

[0539] The elements of m are determined by the following algorithm (i 1,2 Decoding) using C(x,y) 1,2 It can be obtained from s －1 =0 ◆For i=0,...,L-1, ―◆i 1,2 -s i-1 ≧C(x * , Li), if Li≦9, then in table C2, and if Li>9, then in table C3, then * ∈{L-1-i,...,P CSI-RS / 2-1-i}. -◆e i =C(x * ,Li) ―◆s k =s i-1 +e i―◆m (i) =P CSI-RS / 2-1-x *

[0540] m (i) If is known, then i 1,2 is the following algorithm (i 1,2 ◆i 1,2 =Σ i=0 L-1 C(P CSI-RS / 2-1-m (i) , Li) -◆ where C(x,y) is given by the above-mentioned Table C2 and Table C3. As i increases, m (i) Indices i=0,1,...,L-1 are assigned such that .

[0541] <Number of new ports and new (N1, N2)> In the extended CB for the number of new ports (greater than 32), it is considered that the following combinations (Figure 57) will be supported for the total number P of CSI-RS ports across multiple aggregated resources and (N1, N2): ◆ P = 48, (N1, N2) = (8, 3) ◆ P = 48, (N1, N2) = (6, 4) ◆ P = 64, (N1, N2) = (16, 2) ◆ P = 64, (N1, N2) = (8, 4) ◆ P = 128, (N1, N2) = (16, 4) ◆ P = 128, (N1, N2) = (8, 8)

[0542] The extended CB may be an extended CB based on Type 1 CB, or (Rel. 16) an extended CB based on Extended Type 2 CB, or (Rel. 18) an extended CB based on Type 2 Doppler CB.

[0543] In the expansion port selection (PS) CB, the number of new ports P CSI-RS = {48,64} is under consideration for support. The extended PS CB may be a (Rel. 17) additional extended type 2 PS CB.

[0544] <Issue 1> In an extended CB based on Type 2 CB (including Rel. 16 extended Type 2 CB, Rel. 17 additional extended Type 2 PS CB, and Rel. 18 Type 2 Doppler CB), in order to support combinations of up to L SD beam instructions from new N1*N2 (e.g., 24, 32, 64) SD beams, the existing i 1,2 When the encoding / decoding is diverted, the table of combination coefficients C(x, y) is not sufficiently considered.

[0545] In the extended CB based on the extended type 2 CB (Rel. 16) and the extended CB based on the type 2 Doppler CB (Rel. 18), L denotes the selection of L SD beams from the new N1*N2 SD beams. In the extended CB based on the additional extended type 2 PS CB (Rel. 17), L denotes the selection of L SD beams from the new P for one polarization. CSI-RS This means selecting L ports from / 2 ports.

[0546] In the present disclosure, the terms SD beam and vector may be interpreted interchangeably.

[0547] <Embodiment CZ1> In an extended CB for more than 32 ports based on Type 2 CB, a combination of up to L (e.g., L∈{2,4,6}) SD beams from new N1*N2 (e.g., N1*N2∈{24,32,64}) SD beams (for up to 128 ports) or a combination of up to L (e.g., L∈{2,4,6}) SD beams (for up to 64 ports) CSI-RS / 2 (e.g., P CSI-RS / 2∈{24,32}} ports, up to L port combinations. 1,2 may be reused, and a larger table of combination coefficients C(x, y) (for example, table C4 as shown in FIGS. 58, 59, and 60) may be defined. The maximum value of combination coefficients (or the number of candidates, the number of elements in the table) for the extended CB may be larger than the maximum value of combination coefficients (or the number of candidates, the number of elements in the table) for the existing CB.

[0548] This embodiment may be based on at least one of the following additions:

[0549] *Note 1: In the combination coefficient table, the value of y may depend on the maximum value of L. For example, if 4 is supported as the maximum value of L, 5 and 6 are not required to be voted for as y values. For example, if 4 and 6 are not supported as values ​​of L, 3 to 6 are not required to be voted for as y values. For example, if larger values ​​of L, such as 8 or 10, are supported, columns for y values ​​7 to 8 or 7 to 10 are added to the table.

[0550] ◆ Note 2: Separate or common tables may be defined for multiple maximum values ​​of at least one of x and y. For example, three separate tables may be defined for the maximum values ​​of x of 23, 31, and 63. The maximum value of x may be the new N1*N2-1. The tables for the maximum values ​​of x of 23, 31, and 63 may have 24, 32, and 64 rows, respectively, corresponding to the new N1*N2 values. The maximum value of x may be the new P CSI-RS -1. The table of maximum values ​​of x, 23, 31, is CSI-RS For example, for maximum x values ​​of 23, 31, and 63, the maximum y value may be different in the three separate tables. For example, for maximum x values ​​of 63 and maximum y values ​​of 2, L may be 2. For example, for maximum x values ​​of 31 and maximum y values ​​of 4, L may be 4.

[0551] ◆Note 3: Each value in the table may be calculated as the value of the combination of C(x,y).

[0552] ◆ Supplement 4: As with the previously mentioned additional expansion type 2PS CB, the existing i 1,2 To support encoding / decoding of x, a table with large (some, close to the maximum value of x) y values ​​may be defined.

[0553] According to embodiment CZ1, in an extended CB based on Type 2 CB for using more than 32 ports, the UE / gNB can use an appropriate combination coefficient to select / indicate / report an SD beam or port.

[0554] <Point 2> As shown in Figure 61, new N1*N2 or new PCSI-RS The number of bits (size) required to represent the combination varies for multiple values ​​of / 2 and L. In certain cases, the number of bits required to represent the combination can be quite large, up to 27 bits.

[0555] A method for reducing the number of bits of a combination has not been fully considered. It is possible to avoid defining a table with a size larger than the existing size, as in embodiment CZ1.

[0556] In the present disclosure, the minimum distance, spacing, number of beams in a group, and number of ports in a group may be read interchangeably.

[0557] <Embodiment CZ2> Embodiment CZ2 relates to Supplement 2 of Embodiment CZ1.

[0558] The value of L for 128 ports using the new N1*N2=64 may be based on at least one of several options: ◆ Option 1: Only L=2 is supported (L=4,6 are not supported). ◆ Option 2: L=2,4 are supported (L=6 is not supported). ◆ Option 3: Only L=2,4,6 are supported.

[0559] New N1*N2=32 or new P CSI-RS The value of L for 64 ports using / 2=32 may be based on at least one of the following options: ◆ Option 1: Only L=2 is supported (L=4,6 are not supported). ◆ Option 2: L=2,4 are supported (L=6 is not supported). ◆ Option 3: Only L=2,4,6 are supported.

[0560] New N1*N2=24 or new P CSI-RS The value of L for 48 ports using / 2=24 may be based on at least one of the following options: ◆ Option 1: Only L=2 is supported (L=4,6 are not supported). ◆ Option 2: L=2,4 are supported (L=6 is not supported). ◆ Option 3: Only L=2,4,6 are supported.

[0561] New N1*N2 or new P CSI-RS The combination of / 2 and L may be defined in the specification, configured by RRC, or may depend on UE capabilities, such as 128 / 64 / 48 ports and / or a larger L (e.g., L=4 and / or L=6) depending on optional UE capabilities other than support for CSI reporting using more than 32 ports (e.g., 128 ports).

[0562] According to embodiment CZ2, the UE / gNB receives the new N1 * N2 or the new P CSI-RS Any suitable combination of / 2 and L can be used.

[0563] <Embodiment CZ3> In an extended CB for more than 32 ports (e.g., up to 128 ports) based on Type 2 CB, additional constraints on the L SD beams may be supported for selecting a combination of up to L SD beams from the new N1*N2 (e.g., N1*N2∈{24, 32, 64}) SD beams. The constraints may be based on at least one of the following options:

[0564] ◆ Option 1: For two SD beams out of the L number of SD beams, a minimum distance d (d > 1) in one dimension is defined. This is equivalent to grouping the new N1 * N2 SD beams into new groups of fewer than N1 * N2 SD beams, resulting in d groups. This option may be based on at least one of several options 1x below: ◆ Option 1a: For two SD beams out of the L number of SD beams, a minimum distance d (d > 1) in one dimension is defined. H ) may be defined. - Option 1b: For two SD beams out of L SD beams, the minimum distance in the second dimension (N2 dimension, vertical dimension) (e.g., d v ) may be defined.

[0565] ◆ Option 2: For two SD beams out of L SD beams, two minimum distances in two dimensions (e.g., d H and dv ) is defined. H and d v The candidate values ​​of may be associated with N1 and N2, respectively. H and d v Each can be divided by (d H and d v (Note that N1 and N2 may be divisors of N1 and N2, respectively.) Figure 62 shows H and d v An example of candidate values ​​for d is shown below. H and d v The candidate values ​​of may be defined in the specification, may be configured by the RRC, or may depend on the UE capabilities. H and d v At least one final value of may be common to all new (N1, N2) configurations. For example, for all new (N1, N2) configurations, H = 2. d H and d v At least one final value of may be defined / set individually for multiple new (N1, N2) configurations. H and d v Preferably, only one smaller value of is supported and only one value is defined in the specification.

[0566] In an extended CB for more than 32 ports (for example, up to 64 ports) based on the Type 2 PS CB, a new P CSI-RS / 2 (e.g., P CSI-RS For the selection of up to L port combinations from the (24, 32) ports, further constraints on the L ports may be supported. A minimum distance d between any two ports among the L ports may be defined. This is the new P CSI-RS / 2 ports, new P CSI-RSGrouping ports into groups of fewer than 1 / 2 is equivalent to grouping them into d groups. The meaning of the minimum distance d may be the same as portSelectionSamplingSize. To set the minimum distance d, portSelectionSamplingSize may be used, or a parameter based on portSelectionSamplingSize (e.g., portSelectionSamplingSize-r19) may be introduced.

[0567] The candidate value of d is the new P CSI-RS / 2. New P CSI-RS / 2 may be divisible by d (d is P CSI-RS (It may be a divisor of / 2.) Figure 63 shows an example of candidate values ​​for d. The candidate values ​​for d may be defined in the specification, configured by RRC, or may depend on the UE capabilities. The final value of d is calculated based on the CSI-RS / 2 settings. For example, all new P CSI-RS For the / 2 setting, d may be 2. The final value of d is determined by the number of new P CSI-RS May be defined / set separately for / 2 settings. CSI-RS Preferably, only values ​​smaller than / 2 are supported.

[0568] According to embodiment CZ3, in an extended CB for more than 32 ports based on a Type 2 CB or a Type 2 PS CB, L groups of SD beams or ports can be appropriately selected / displayed / reported.

[0569] <Embodiment CZ4> Using the constraints of embodiment CZ3, i 1,2 The total number of combinations for C(x,y) can be reduced, and the size of the table of combination coefficients C(x,y) can also be reduced. H -1 or new N1*N2 / d v -1 or new N1*N2 / (d H *d v )-1 or new P CSI-RS / 2d may also be used.

[0570] For example, for each new (N1, N2) setting, d H = 2, the maximum value of X is the new N1*N2 / d H -1, and the number of rows in the C(x,y) table is reduced to half that of table C4 in embodiment CZ1. Based on embodiment CZ1, a maximum value of X of 31 is sufficient for the new C(x,y) table.

[0571] For example, for new (N1, N2) = (16, 2), d H =d v = 2, the maximum value of X is the new N1*N2 / (d H *d v )-1=8-1=7, and the number of rows in the C(x,y) table is reduced to 1 / 4 of that of table C4 in embodiment CZ1.

[0572] For example, for new (N1, N2) = (16, 4), d H =d v = 2, the maximum value of X is the new N1*N2 / (d H *d v )-1=16-1=15, and the number of rows in the C(x,y) table is reduced to 1 / 4 of that of table C4 in embodiment CZ1.

[0573] For example, new P CSI-RS = 64, when d = 2, the maximum value of X is the new P CSI-RS / 2d-1=16-1=15, and the number of rows in the C(x,y) table is reduced to half that of table C4 in embodiment CZ1.

[0574] As shown in the example of FIG. 64A, for new (N1, N2) = (16, 4), d H = 2, the selection of L SD beams from N1*N2=16*4=64 SD beams is N1*N2 / d H =16*4 / 2=32 groups to select L groups.

[0575] As shown in the example of FIG. 64B, for new (N1, N2) = (16, 4), d v = 2, the selection of L SD beams from N1*N2=16*4=64 SD beams is N1*N2 / dv =16*4 / 2=32 groups to select L groups.

[0576] As shown in the example of FIG. 64C, for new (N1, N2) = (16, 4), d H =d v = 2, the selection of L SD beams from N1*N2=16*4=64 SD beams is N1*N2 / (d H *d v )=16*4 / (2*2)=16 groups to select L groups.

[0577] As shown in the example of Figure 65, new P CSI-RS = 64, and d = 2, P CSI-RS The selection of L ports from / 2=64 / 2=32 ports is CSI-RS The selection of L groups is made from / 2d=64 / (2*2)=16 groups.

[0578] Using the constraints of embodiment CZ3, after the L groups are selected / displayed, the L SD beams or L ports may be determined based on at least one of the following options:

[0579] ◆ Option 1: Within each selected group, H SD beams or d v SD beams or (d H *d v ) SD beams or d ports, the first SD beam or the first port is selected. - ◆ Variation: 1st, 2nd, ..., d within each selected group H th, d v th, (d H *d v )th or dth SD beam or port may be selected in the specification. - ◆ According to this option, no additional feedback is required for the selection of the SD beam or port.

[0580] ◆ Option 2: The selected SD beam or port is the feedback content i x Within each selected group, dH SD beams or d v SD beams or (d H *d v ) SD beams or d ports, i to indicate one SD beam or port. x The size (number of bits) of H )), ceil(log2(d v )), ceil(log2(d H *d v )), ceil(log2(d)), or ceil(log2(d)). The selected SD beam or port (feedback content i x ) is common to the L groups. - ◆ Variation: The selected SD beam or port (feedback content i x ) may be individual for each group. The selected SD beam or port (feedback content i x ) may be common to a certain number of groups and individual for the remaining groups.

[0581] Which options are supported may be defined in the specification, may be configured by the RRC, or may depend on the UE capabilities.

[0582] As shown in the example of FIG. 66A, for new (N1, N2) = (16, 4), d H = 2, the selection of L SD beams from N1*N2=16*4=64 SD beams is N1*N2 / d H = 16 * 4 / 2 = 32 groups, resulting in the selection of L groups. In this example, L = 2, option 1 is assumed. The specification defines that L = 2 groups are selected, and the first SD beam in each group is selected.

[0583] As shown in the example of FIG. 66B, for new (N1, N2) = (16, 4), d H =d v = 2, the selection of L SD beams from N1*N2=16*4=64 SD beams is N1*N2 / (d H *d v) = 16 * 4 / (2 * 2) = 16 groups, resulting in the selection of L groups. In this example, L = 4, option 2 is assumed. L = 4 groups are selected, and one SD beam in each group is selected as i x is shown by

[0584] As shown in the example of Figure 67A, new P CSI-RS = 64, and d = 2, P CSI-RS The selection of L ports from / 2=64 / 2=32 ports is CSI-RS The selection of L groups is made from / 2d=64 / (2*2)=16 groups. In this example, L=2, option 1 is assumed. The specification defines that L=2 groups are selected and the first port in each group is selected.

[0585] As shown in the example of Figure 67B, new P CSI-RS = 64, and d = 2, P CSI-RS The selection of L ports from / 2=64 / 2=32 ports is CSI-RS / 2d=64 / (2*2)=16 groups to select L groups. In this example, L=2, option 2 is assumed. L=2 groups are selected, and one port in each group is assigned to i x is shown by

[0586] d H =2 or d v The number of bits for the combination coefficients in option 1 when d=2 or d=2 is assumed is shown in Figure 68. In option 2, this number of bits is x A bit is added for a specific new (N1, N2) setting or a specific new P CSI-RS To reduce the supported y / L for a setting, embodiment CZ2 may be applied to embodiment CZ4.

[0587] d H =2 or d v When d=2 or d=2 is assumed, the combination coefficient table C5 is as shown in Figure 69. 1,2 The encoding / decoding of the above may be diverted.

[0588] According to embodiment CZ4, in an extended CB for more than 32 ports based on a Type 2 CB or a Type 2 PS CB, L SD beams or L ports can be appropriately selected / displayed / reported.

[0589] <Multi-CRI-based CSI Reporting> Regarding item 2c above, in the CRI-based CSI extension / improvement for more than 32 CSI-RS ports, K S The value and the maximum number of ports per NZP CSI-RS resource may be based on at least one of several combinations of: S =2,3,4, Maximum number of ports per resource = 32 ◆K S =5,6,7,8, while max number of ports per resource = 16

[0590] <Embodiment CZ5> In multi-CRI reporting based on (Rel. 16) Extended Type 2 for item 2c, embodiment CZ2 may be applied to at least one of multiple settings for the number of CSI-RS resources (CMR) and multiple values ​​for the maximum number of ports per resource. For multiple settings for the number of CSI-RS resources, the value of L may be based on at least one of the following options: ◆ Option 1: Only L=2 is supported (L=4,6 is not supported). ◆ Option 2: L=2,4 is supported (L=6 is not supported). ◆ Option 3: Only L=2,4,6 is supported.

[0591] For each CMR, the constraints of L SD beams and embodiment CZ3 may be applied in the combination of selecting up to L SD beams from the existing N1*N2 SD beams. The selection of up to L SD beams may be based on at least one of several options: ◆ Option 1: For two SD beams out of the L SD beams, a minimum distance d (d > 1) in one dimension is defined. This is equivalent to grouping the existing N1*N2 SD beams into groups of fewer than the existing N1*N2 SD beams, resulting in d groups. ◆ Option 2: For two SD beams out of the L SD beams, two minimum distances in two dimensions (e.g., d H and d v ) is defined. H and d v An example of candidate values ​​for is shown below.

[0592] According to embodiment CZ4, in multi-CRI reporting based on extended type 2CB, L SD beams can be appropriately selected / displayed / reported.

[0593] ((Embodiment DA)) <Type 2 CB> In an extended CB based on Type 2 CB, the combination of SD beams (L vectors) is, as described above (Type 2 codebook), 1,1 and i 1,2 Identified by i 1,1 denotes a group with multiple orthogonal ports / SD beams / vectors. 1,2 indicates a combination of L SD beams from N1 * N2 SD beams. The L SD beams are common to all layers. In the example of Figure 71, L = 4 SD beams common to all layers are selected.

[0594] <Issues> Embodiments AJ and AQ describe a method for reporting one SD beam per layer in an extended CB based on Type 1 CB.

[0595] Embodiments AK and CZ describe a method for reporting multiple SD beams common to all layers by combined display in an extended CB based on Type 2 CB.

[0596] In the extended CB based on Type-1 CB, multiple SD beams can be reported jointly for all layers using a signaling method similar to that used for reporting combination indications in Type-2 CB. The combination of L SD beams reported in Type-2 CB applies to each layer (the same L SD beams are applied to each layer). On the other hand, the combination of L SD beams reported in Type-1 CB applies to multiple layers (one SD beam is applied per layer). The order of the L SD beams selected in Type-2 CB is not important. However, the order of the L SD beams selected in Type-1 CB is important because it affects which SD beams are applied to which layers. The value of L in Type-2 CB is set by the NW and is fixed for the UE. On the other hand, the value of L in Type-1 CB is variable and related to the reported rank.

[0597] This signaling method reduces feedback overhead in some cases compared to reporting individual SD beams for each layer, and can achieve unified signaling feedback for SD beam reporting in Type 1 CB and Type 2 CB.

[0598] In the present disclosure, an extended CB for more than 32 ports based on a Type 1 CB, a Type x CB, may be read interchangeably, where x may be an integer equal to or greater than 3.

[0599] <Embodiment DA1> In an extended CB for more than 32 ports based on Type 1 CB, the SD beam reporting design may be similar to the SD beam reporting design in Type 2 CB.

[0600] i 1,1 may denote a group having multiple orthogonal ports / SD beams / vectors. 1,2may indicate a combination of LL SD beams from N1 * N2 SD beams. The meaning of LL may be different from the meaning of L in the existing Type 2 CB. In Type 1 CB, LL may mean the reported rank v (LL = v). One SD beam from LL SD beams corresponds to one layer from v layers.

[0601] For example, if the rank v is 4, LL=4 SD beams are selected / reported. For example, if the rank v is 6, LL=6 SD beams are selected / reported.

[0602] If the maximum rank reported by the UE is configured to be MAX_v, then the rank v(LL) reported by the UE will not exceed the selected MAX_v.

[0603] Embodiment DA1 may be applied only for RI=1 to 4. Even if MAX_v is set to be greater than 4, the maximum value of LL may be 4. For RI=5 to 8, embodiment AW may be further applied, and the reporting overhead for more than four layers may be reduced by introducing some constraints on SD beams between multiple layers.

[0604] In embodiment DA1, i 1,2 The size (number of bits) of Ĥ is related to the rank v reported by the UE and may be variable.

[0605] Variation: LL may be determined by the UE based on the rank v reported by the UE. LL≦v may also be true. In this case, an additional report of the actual LL value is required, the size of which is ceil(log2(v)) bits. For example, if MAX_v=4 is set and the UE reports v=3, LL is indicated by two bits from {1, 2, 3}. In the example of Figure 72, one SD beam is selected for each of the v=4 layers, resulting in a total of LL=4 SD beams.

[0606] The L vectors combined by the codebook are 1,1 and i1,2 Identified by i 1,1 =[q1 q2] q1∈{0,1,...,O1-1} q2∈{0,1,...,O2-1} i 1,2 ∈{0,1,..., N_1N_2 C LL -1}

[0607] According to embodiment DA1, the UE / gNB can properly report SD beams in an extended CB for more than 32 ports based on Type 1 CB.

[0608] <Embodiment DA2> When LL=v (when the number of selected SD beams and the number of layers are the same), the mapping of LL SD beams to v layers may be based on at least one of the following options:

[0609] ◆ Option 1: The mapping of LL SD beams to v layers is a one-to-one mapping between multiple SD beams and multiple layers using rules. No additional feedback is required. i 1,2 The LL SD beams reported by may be derived based only on the combination. For example, the first SD beam corresponds to the first layer, the second SD beam corresponds to the second layer, and the i-th SD beam corresponds to the i-th layer. SD beams with smaller indices may correspond to layers with smaller indices.

[0610] ◆ Option 2: Add an additional i to indicate the mapping order of LL SD beams to v layers (the association between LL SD beams and v layers, the index / order of LL SD beams corresponding to each v layer, and the index / order of v layers corresponding to each LL SD beam). 1,x For example, there are two ways: LL*(LL-1)*...*, so i 1,x The size of is ceil(log2(LL*(LL-1)*...*2)) bits. For example, if LL=4, there are 4*3*2=24 ways, so i 1,xThe size of is ceil(log2(24) = 5 bits. For example, if LL=3, there are 3*2=6 ways, so i 1,x The size of is ceil(log2(6)) = 3 bits.

[0611] ◆ Option 3: The mapping of LL SD beams to v layers is a one-to-one mapping without additional feedback. 1,2 The LL SD beams reported by N_1*N_2 P LL ) for Type 2. 1,2 The encoding / decoding of the above may not be diverted.

[0612] ◆ Option 4: The mapping of LL SD beams to v layers is one-to-one mapping for only a portion of the LL SD beams and v layers. For example, the UE reports mapping between one or more SD beams and the first / second layer, and rule-based mapping (e.g., option 1) is applied to the remaining layers. The UE may be required to report additional bits for only a portion of the v layers (e.g., the first / second layer).

[0613] If LL≦v, the mapping of the LL SD beams to the v layers may be based on at least one of the following options:

[0614] ◆ Option 1: The mapping of LL SD beams to v layers is a mapping using a rule. There may be constraints between LL and v. No additional feedback may be required.

[0615] ◆ Option 2: Add i to indicate the mapping order of LL SD beams to v layers. 1,x is reported. It may be required that v be divisible by LL (LL is a factor of v).

[0616] For at least one of the C(x,y) table and the reduction in the number of combinations, embodiment CZ may be applied to signaling of combinations in an extended CB based on type 1 CB.

[0617] According to embodiment DA2, the UE / gNB can properly associate LL SD beams to v layers.

[0618] <Supplement to embodiment DA> Other values ​​of (O1, O2) may be applied, for example, at least one of (O1, O2)=(2, 2), (1, 4), (4, 1), and (1, 1) may be applied.

[0619] ((Supplementary Note)) <<Notification of Information to UE>> In the above-described embodiments, any information may be notified to the UE [from a Network (NW) (e.g., a Base Station (BS))] (in other words, reception of any information from the BS by the UE) using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE, RRC message, LTE positioning protocol (LPP) message), specific signal / channel (e.g., DCI, PDCCH, PDSCH, reference signal), or a combination thereof.

[0620] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards. The MAC CE may be an extension of an existing MAC CE. For example, the MAC CE may be an existing MAC CE with a new octet introduced.

[0621] When the notification is performed by a DCI, the notification may be performed by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc. The specific field may be an existing DCI field or a new DCI field. The RNTI may be an existing RNTI or a new RNTI. The format of the DCI may be an existing DCI format or a new DCI format.

[0622] In addition, notification of any information to the UE in the above embodiments may be periodic, semi-persistent (triggered by the UE or the gNB), or aperiodic (triggered by the UE or the gNB).

[0623] In the above embodiment, the UE may receive information on at least one of the following QCL rules from the NW: QCL Type A QCL Type B QCL Type C QCL Type D

[0624] In the above embodiment, the QCL source RS for each QCL type may be at least one of the following several RSs: ◆ SSB ◆ CSI-RS with / without repetition ◆ TRS ◆ DMRS of PDCCH / PDSCH

[0625] In the above-described embodiment, the information from the NW may be set / instructed by the following methods: Common to multiple UEs or UE-specific Cell-specific or common to multiple cells Per UE / per CC / per BWP / per band / per cell / per cell group (CG)

[0626] <<Notification of Information from UE>> In the above-described embodiments, notification of any information from the UE [to the NW] (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE, RRC message, LPP message), specific signals / channels (e.g., UCI, PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0627] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader. The MAC CE may be an extension of an existing MAC CE. For example, the MAC CE may be an extension of an existing MAC CE by introducing a new octet.

[0628] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0629] In addition, notification of any information from the UE in the above embodiments may be periodic, semi-persistent (triggered by the UE or the gNB), or aperiodic (triggered by the UE or the gNB).

[0630] <<Regarding Application of Each Embodiment>> In a UE / BS, specific (one or more) processes / operations / controls / assumptions / information for at least one of the above-mentioned embodiments may be applied (used) when one or more of the following conditions are met: - a higher layer parameter indicating the specific processes / operations / controls / assumptions / information is configured; - the specific processes / operations / controls / assumptions / information is determined based on related higher layer parameters; - the specific processes / operations / controls / assumptions / information is specified / activated / triggered by a MAC CE / DCI / UCI / resource / channel / RS; - a specific UE capability indicating (or related to) the specific processes / operations / controls / assumptions / information is reported or supported; - the application of the specific processes / operations / controls / assumptions / information is determined based on specific conditions.

[0631] The specific UE capability may indicate at least one of the following: ◆ Supporting the specific process / operation / control / assumption / information ◆ Capability of each embodiment ◆ Capability of each option in each embodiment, or capability of a combination of multiple options in each embodiment ◆ Capability of each option in each embodiment, or capability of a combination of multiple options in each embodiment.

[0632] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0633] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0634] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0635] The information on whether one or more of the above embodiments / options / choices / examples apply / are used, or which of several of the above embodiments / options / choices / examples apply / are used, may be based on several of the following methods: ◆ The information is configured by one or more higher layer parameters / RRC IEs. ◆ The information is determined by one or more related higher layer parameters / RRC IEs. ◆ The information is indicated by a MAC CE / DCI. ◆ The information is based on one or more UE capabilities. ◆ The information is described / defined in a specification. ◆ The information is based on conditions described / defined in a specification. ◆ The information is determined by a combination of several of the above information. For example, the information is determined by the configuration / indication of higher layer parameters / MAC CE / DCI and reported by a UE capability.

[0636] The above embodiments / options / choices may be combined into one embodiment / option / choice.

[0637] In the above embodiments, the RS to be measured may be a QCL source RS in an active / indicated / unified TCI state.

[0638] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver that receives a channel state information (CSI) report configuration indicating a plurality of CSI-RS resources and a codebook type based on a type-2 codebook, for reporting for more than 32 first antenna ports or for reporting a plurality of CSI-RS resource indicators for 32 or less second antenna ports; and a controller that determines, based on the configuration, the number of selected beams or the number of selected antenna ports from among some of candidate values ​​for the number of selected beams or the number of selected antenna ports in the type-2 codebook. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the controller selects a plurality of groups of beams or antenna ports and controls transmission of reports for the plurality of groups. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the controller selects a plurality of groups of beams or antenna ports and controls transmission of a report for one beam or one antenna port common to the plurality of groups. [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the maximum number of combination coefficients when using the first antenna port is greater than the maximum number of combination coefficients when using 32 or fewer antenna ports.

[0639] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver that receives a channel state information (CSI) report configuration indicating a plurality of CSI-RS resources and a codebook type based on a Type 2 codebook, for reporting for more than 32 first antenna ports or for reporting a plurality of CSI-RS resource indicators for 32 or less second antenna ports; and a controller that selects a plurality of groups of beams or antenna ports based on the configuration and controls transmission of reports for the plurality of groups. [Supplementary Note 2] The terminal described in Supplementary Note 1, wherein the controller selects a plurality of groups of beams or antenna ports and controls transmission of a report of one beam or one antenna port common to the plurality of groups. [Supplementary Note 3] The terminal described in Supplementary Note 1 or Supplementary Note 2, wherein the controller supports some of the candidate values ​​for the number of beams to be selected or the number of antenna ports to be selected in the Type 2 codebook. [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the maximum number of combination coefficients when using the first antenna port is greater than the maximum number of combination coefficients when using 32 or fewer antenna ports.

[0640] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal having: a receiver that receives a CSI report configuration indicating multiple channel state information (CSI)-reference signal (RS) resources using more than 32 antenna ports and a codebook type based on a Type 1 codebook; and a controller that controls transmission of a report of multiple beams corresponding to multiple layers based on the configuration. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the number of the multiple beams is equal to a reported rank. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the multiple beams correspond to the multiple layers, respectively. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the controller controls transmission of a report indicating association of the multiple beams with the multiple layers.

[0641] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0642] 73 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) specified by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0643] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0644] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (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.

[0645] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0646] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The location, number, shape, size, etc. of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as the base station 10.

[0647] 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 may be formed by multiple antennas / base stations 10. One [virtual] cell (which may be called, for example, a supercell) may be composed of multiple [virtual] cells (which may be called, for example, subcells). A supercell may correspond to a cell with a fixed physical range, and a subcell may correspond to a cell with a quasi-static / dynamically variable physical range. In this case, the wireless communication system 1 may be called a cell-free system.

[0648] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0649] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0650] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0651] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 / Xn interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0652] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0653] The core network 30 may include network functions (Network Functions (NF)) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0654] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0655] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0656] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0657] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0658] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0659] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0660] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0661] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0662] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0663] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0664] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0665] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0666] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0667] 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 an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0668] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0669] (Base Station) Fig. 74 is a diagram showing an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that there may be one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0670] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0671] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0672] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0673] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0674] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0675] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0676] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0677] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0678] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0679] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0680] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0681] 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.

[0682] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0683] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0684] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between 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 user terminal 20.

[0685] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0686] 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 functions of the physical layer (precoding, IFFT, FFT, etc.). The DU may implement higher-level functions of the physical layer (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may implement the functions of the PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer.

[0687] In the present disclosure, the base station 10 may include a single device that realizes all of the functions of the RU, DU, and CU, or may include multiple devices that each realize some of the functions of the RU, DU, and CU and are connected to each other. In the present disclosure, the base station 10 may be interchangeably read as RU / DU / CU.

[0688] The transceiver 120 may transmit a channel state information (CSI) report configuration indicating a plurality of CSI-RS resources and a codebook type based on a Type-2 codebook for a report for more than 32 first antenna ports or a report of a plurality of CSI-RS resource indicators for 32 or less second antenna ports. The controller 110 may control reception of a report of the number of selected beams or the number of selected antenna ports from among some of candidate values ​​of the number of selected beams or the number of selected antenna ports in the Type-2 codebook based on the configuration.

[0689] The transceiver 120 may transmit a channel state information (CSI) report configuration indicating a plurality of CSI-RS resources and a codebook type based on a Type 2 codebook for reporting a plurality of CSI-RS resource indicators for more than 32 first antenna ports or for reporting a plurality of CSI-RS resource indicators for 32 or less second antenna ports. The controller 110 may select a plurality of groups of beams or antenna ports based on the configuration and control reception of reports for the plurality of groups.

[0690] The transceiver 120 may transmit a channel state information (CSI) report configuration indicating multiple CSI-reference signal (RS) resources using more than 32 antenna ports and a codebook type based on a Type 1 codebook. The controller 110 may control reception of reports of multiple beams corresponding to multiple layers based on the configuration.

[0691] (User terminal) Fig. 75 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0692] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0693] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0694] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0695] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0696] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0697] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0698] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0699] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0700] The transceiver 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, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0701] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0702] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0703] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0704] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0705] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0706] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0707] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The 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 the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0708] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0709] The transceiver 220 may receive a channel state information (CSI) reporting configuration indicating a plurality of CSI-RS resources and a codebook type based on a Type-2 codebook for reporting for more than 32 first antenna ports or for reporting a plurality of CSI-RS resource indicators for 32 or less second antenna ports. The controller 210 may determine the number of selected beams or the number of selected antenna ports from among a subset of candidate values ​​for the number of selected beams or the number of selected antenna ports in the Type-2 codebook based on the configuration.

[0710] The controller 210 may select multiple groups of beams or antenna ports and control the transmission of reports for the multiple groups.

[0711] The controller 210 may select multiple groups of beams or antenna ports and control transmission of reports of one beam or one antenna port common to the multiple groups.

[0712] The maximum number of combination coefficients when using the first antenna port may be greater than the maximum number of combination coefficients when using 32 or fewer antenna ports.

[0713] The transceiver 220 may receive a channel state information (CSI) reporting configuration indicating a plurality of CSI-RS resources and a codebook type based on a Type 2 codebook for reporting a plurality of CSI-RS resource indicators for more than 32 first antenna ports or for reporting a plurality of CSI-RS resource indicators for 32 or less second antenna ports. The controller 210 may select a plurality of groups of beams or antenna ports based on the configuration and control transmission of reports for the plurality of groups.

[0714] The controller 210 may select multiple groups of beams or antenna ports and control transmission of reports of one beam or one antenna port common to the multiple groups.

[0715] The control unit 210 may support some of the candidate values ​​of the number of beams selected in the type 2 codebook or the number of antenna ports selected.

[0716] The maximum number of combination coefficients when using the first antenna port may be greater than the maximum number of combination coefficients when using 32 or fewer antenna ports.

[0717] The transceiver 220 may receive a channel state information (CSI) report configuration indicating multiple CSI-reference signal (RS) resources using more than 32 antenna ports and a codebook type based on a Type 1 codebook. The controller 210 may control transmission of reports of multiple beams corresponding to multiple layers based on the configuration.

[0718] The number of beams may be equal to the reported rank.

[0719] The plurality of beams may correspond to the plurality of layers, respectively.

[0720] The control unit 210 may control the transmission of a report indicating the association between the plurality of beams and the plurality of layers.

[0721] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0722] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0723] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 76 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0724] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0725] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0726] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0727] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0728] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0729] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0730] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0731] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0732] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0733] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0734] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0735] In addition, the devices included in the core network 30 (for example, network nodes that provide NF) may also be realized by the above-mentioned functional block / hardware configuration.

[0736] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0737] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0738] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0739] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0740] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0741] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0742] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0743] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0744] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0745] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0746] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0747] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0748] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0749] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0750] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0751] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0752] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0753] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0754] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0755] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0756] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0757] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0758] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0759] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0760] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0761] With respect to any information (e.g., variables, constants, parameters) described in the present disclosure, even if not specifically stated in the above embodiments, any first device (e.g., UE / base station) may notify any second device (e.g., base station / UE) of information indicating / specifying (or relating to) the value of the any information.

[0762] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0763] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0764] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0765] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0766] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0767] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0768] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0769] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0770] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0771] The group may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0772] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0773] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0774] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0775] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0776] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0777] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0778] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0779] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0780] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0781] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0782] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0783] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0784] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0785] 77 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0786] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0787] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0788] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0789] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0790] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0791] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0792] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0793] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0794] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0795] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0796] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0797] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0798] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0799] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0800] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0801] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advance...

Claims

1. A terminal having a receiver that receives a CSI report configuration indicating a plurality of CSI-RS resources and a codebook type based on a type 2 codebook for reporting on more than 32 first antenna ports or reporting on a plurality of CSI-RS resource indicators for 32 or less second antenna ports; and a controller that determines the number of beams to be selected or the number of antenna ports to be selected from a portion of candidate values ​​for the number of beams to be selected or the number of antenna ports to be selected in the type 2 codebook based on the configuration.

2. The terminal according to claim 1, wherein the control unit selects multiple groups of beams or antenna ports and controls transmission of reports of the multiple groups.

3. The terminal according to claim 1, wherein the control unit selects multiple groups of beams or antenna ports and controls the transmission of reports of one beam or one antenna port common to the multiple groups.

4. The terminal according to claim 1, wherein the maximum number of combination coefficients when using the first antenna port is greater than the maximum number of combination coefficients when using 32 or fewer antenna ports.

5. A wireless communication method for a terminal, comprising: a step of receiving a CSI report configuration indicating a plurality of CSI-RS resources and a codebook type based on a type 2 codebook for reporting on more than 32 first antenna ports or reporting a plurality of CSI-RS resource indicators for 32 or less second antenna ports; and a step of determining the number of selected beams or the number of selected antenna ports from a portion of candidate values ​​of the number of selected beams or the number of selected antenna ports in the type 2 codebook based on the configuration.

6. A base station having: a transmitter that transmits a channel state information (CSI) report configuration indicating a plurality of CSI-RS resources and a codebook type based on a type 2 codebook for reporting on more than 32 first antenna ports or reporting on a plurality of CSI-RS resource indicators for 32 or less second antenna ports; and a controller that controls, based on the configuration, reception of a report on the number of selected beams or the number of selected antenna ports from among a portion of candidate values ​​for the number of selected beams or the number of selected antenna ports in the type 2 codebook.

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