Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives a setting of a channel state information (CSI)-reference signal (RS) which uses more than 32 ports; and a control unit that measures CSI on the basis of the setting. The setting indicates at least one of: a combination of a horizontal antenna element number and a vertical antenna element number; a panel number; a combination of the panel number, the horizontal antenna element number, and the vertical antenna element number; and a combination of a horizontal panel number, a vertical panel number, the horizontal antenna element number, and the vertical antenna element number.

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, if a large number of periodic / semi-persistent channel state information-reference signals (CSI-RSs) are configured to manage a large number of beams, the resource utilization efficiency may be reduced, which may result in a decrease in 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 efficiently utilize CSI-RS resources.

[0008] A terminal according to one aspect of the present disclosure has a receiving unit that receives a channel state information (CSI)-reference signal (RS) configuration using more than 32 ports, and a control unit that measures the CSI based on the configuration, wherein the configuration indicates at least one of a combination of the number of horizontal antenna elements and the number of vertical antenna elements, a number of panels, a combination of the number of panels, the number of horizontal antenna elements, and the number of vertical antenna elements, a number of horizontal panels and the number of vertical panels, and a combination of the number of horizontal antenna elements and the number of vertical antenna elements.

[0009] According to one aspect of the present disclosure, CSI-RS resources can be utilized efficiently.

[0010] FIG. 1 is a diagram showing an example of a CSI-RS location within a slot. FIGS. 2A to 2D are diagrams showing examples of FD-OCC and TD-OCC. FIG. 3 is a diagram showing an example of a CSI-RS location for each number of ports. FIG. 4 is a diagram showing an example of 32-port CSI-RS mapping. FIGS. 5A and 5B are diagrams showing an example of a CSI-RS to which inter-PRB OCC is applied. FIGS. 6A to 6C are diagrams showing an example of inter-PRB OCC. FIGS. 7A and 7B are diagrams showing an example of overlapping of an old release CSI-RS and a new release CSI-RS. FIG. 8 is a diagram showing an example of CSI-RS measurement operation of a UE not configured with inter-PRB OCC. FIG. 9 is a diagram showing an example of a CSI-RS to which inter-slot OCC is applied. FIG. 10 is a diagram showing an example of existing CSI-RS resources and additional CSI-RS resources. FIG. 11 is a diagram illustrating an example of an additional OCC applied across existing CSI-RS resources and additional CSI-RS resources. FIG. 12 is a diagram illustrating an example of a case where at least one of time and frequency differs between existing CSI-RS resources and additional CSI-RS resources. FIG. 13 is a diagram illustrating an example of a case where at least one of sequence and scrambling ID differs between existing CSI-RS resources and additional CSI-RS resources. FIG. 14 illustrates an example of beam application timing 1. FIG. 15 illustrates an example of CSI-RS resource application timing. FIG. 16 illustrates the association between the supported number of CSI-RS ports and the base station antenna layout for a single panel of the existing specifications. FIG. 17 illustrates the association between the supported number of CSI-RS ports and the base station antenna layout for a multi-panel of the existing specifications. FIG. 18 illustrates an example of a configuration according to Option 1 of embodiment C1. FIG. 19 illustrates a first example of a configuration according to Option 2 of embodiment C1. Fig. 20 shows a second example of a setting according to option 2 of embodiment C1. Figs. 21A and 21B show an example of a base station antenna layout according to option 2 of embodiment C1. Fig. 22 shows a first example of a setting according to option 3 of embodiment C1. Fig. 23 shows a second example of a setting according to option 3 of embodiment C1. Figs. 24A and 24B show an example of a base station antenna layout according to option 3 of embodiment C1.Fig. 25 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. Fig. 26 is a diagram showing an example of a configuration of a base station according to an embodiment. Fig. 27 is a diagram showing an example of a configuration of a user terminal according to an embodiment. Fig. 28 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. Fig. 29 is a diagram showing an example of a vehicle according to an embodiment.

[0011] (TCI, spatial relationship, QCL) In NR, it is considered to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a UE of at least one of a signal and a channel (referred to as a signal / channel) based on a transmission configuration indication state (TCI state).

[0012] The TCI state may represent that which is applied to a downlink signal / channel, and the equivalent of the TCI state that is applied to an uplink signal / channel may be expressed as a spatial relation.

[0013] The TCI state is information about the Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relation information, etc. The TCI state may be configured in the UE for each channel or signal.

[0014] The QCL is an index indicating the statistical properties of signals / channels. For example, if a signal / channel has a QCL relationship with another signal / channel, it may mean that it can be assumed that at least one of the following parameters is the same between these different signals / channels (i.e., the QCL is true for at least one of the following parameters): Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter).

[0015] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may be replaced with sQCL (spatial QCL).

[0016] A plurality of types of QCLs (QCL types) may be defined. For example, four QCL types A to D may be provided, each having different parameters (or parameter sets) that can be assumed to be the same.

[0017] The UE's assumption that a Control Resource Set (CORESET), channel, or reference signal has a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0018] The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on the TCI condition or QCL assumption of the signal / channel.

[0019] The TCI state may be, for example, information about the QCL between the channel of interest (in other words, the Reference Signal (RS) for that channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0020] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0021] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0022] Furthermore, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).

[0023] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may also be referred to as an SS / PBCH block.

[0024] An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel / signal (DMRS), and this RS may be called a QCL source of QCL type X in the TCI state.

[0025] In the present disclosure, the terms TCI state, indicated TCI state, unified TCI state, TCI state applied to channels / signals configured to follow the unified TCI state, TCI state applied to a UE-specific PDSCH and a CORESET / PDCCH associated with a USS, and TCI state applied to a PUCCH and a PUSCH may be interpreted interchangeably.

[0026] (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)).

[0027] 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.

[0028] 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).

[0029] The CSI may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), 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.

[0030] The UE may receive information related to CSI reporting (report configuration information) and control CSI reporting based on the report configuration information. The report configuration information may be, for example, "CSI-ReportConfig" of an information element (IE) of Radio Resource Control (RRC). Note that in the present disclosure, the RRC IE may be interchangeably read as an RRC parameter, an upper layer parameter, or the like.

[0031] 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 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 targeted for CSI reporting (frequency domain information, e.g., "reportFreqConfiguration" of the RRC IE)

[0032] 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.

[0033] 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.).

[0034] 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).

[0035] 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.

[0036] 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).

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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).

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] In Rel. 15 NR, UCI may contain one CSI part for wideband PMI feedback. CSI report #n contains PMI wideband information if reported.

[0046] 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.

[0047] 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).

[0048] 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.

[0049] (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.

[0050] 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).

[0051] 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.

[0052] (CSI Reporting Configuration) The CSI reporting configuration (CSI-ReportConfig) of Rel. 16 includes, in addition to the codebook configuration (CodebookConfig), CSI-RS resources for channel measurement (resourcesForChannelMeasurement (CMR)), CSI-RS resources for interference measurement (csi-IM-ResourcesForInterference (ZP-IMR), nzp-CSI-RS-ResourcesForInterference (NZP-IMR)), etc. Of the parameters of CSI-ReportConfig, parameters excluding codebookConfig-r16 are also included in the CSI reporting configuration of Rel. 15.

[0053] 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.

[0054] 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.

[0055] <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.

[0056] <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.

[0057] 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.

[0058] However, in the CSI reporting configuration for Rel. 17 multi-TRP, when the above-mentioned options 1 and 2 are applied, the following measurement configurations may be performed: 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.

[0059] 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.

[0060] (PMI / Type 1 Codebook) Type 1 codebook (Rel. 15) specifies a Type 1 single panel codebook and a Type 1 multi-panel codebook for base station panels. In Type 1 single panel, the antenna model 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.

[0061] - 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 ]. i1 may be the index for the wideband. i2=n may be the index for the subband / phase.

[0062] 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.

[0063] 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 The precoding matrix for the one-layer CSI reporting codebook using 1,1 ,i 1,2 ,i2^(1)=W l,m,n (1) is given by the following equation:

[0064] where vl,m is an N1-by-N2 DFT vector (spatial domain (SD) vector, 2D-DFT vector, SD 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, l. l,m indicates one beam. The phase difference between the polarizations (horizontal polarization and vertical polarization) (co-phasing, phase compensation between polarizations) φ n =exp(jπn / 2), which indicates the phase of one polarized wave relative to the phase of the other polarized wave.

[0065] - 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, the number of panels N in addition to N1 and N2 is increased. g is set as the inter-panel co-phasing (phase compensation between panels), 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.

[0066] 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.

[0067] For codebook mode (codebookMode) = 1, antenna ports 3000 to 2999+P CSI-RS The precoding matrix for the one-layer CSI reporting codebook using 1,1 ,i 1,2 ,i 1,4 , i2 and W_i 1,1 ,i 1,2 ,i 1,4 ,i2^(1), where W l,m,p,n (1) =W l,m,p,n ^(1,N g ,1).

[0068] For codebook mode = 1, antenna ports 3000 to 2999+P CSI-RS For a two-layer CSI reporting codebook using g ={2,4}, the precoding matrix W_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 W_l,m,p,n^(1,N g ,1) and W_l,m,p,n^(2,N g ,1) (first layer, N g = 2, precoding matrix W for codeBookMode = 1 l,m,p,n 1,2,1 and the second layer, N g = 2, precoding matrix W for codeBookMode = 1 l,m,p,n 2,2,1 and the first layer, N g = 4, precoding matrix W for codeBookMode = 1 l,m,p,n1,4,1 and the second layer, N g = 4, precoding matrix W for codeBookMode = 1 l,m,p,n 2,4,1 and ) are given by the following equations:

[0069] where φ n =e jπn / 2 N g =2, p=p1, and N g For =4, p=[p1,p2,p3]. φ_p1, φ_p2, and φ_p3 represent inter-panel phase differences (inter-panel phase compensation). The same SD beam is selected for panels 0, 1, 2, and 3, and φ_p1 represents the phase difference of panel 1 relative to panel 0, φ_p2 represents the phase difference of panel 2 relative to panel 0, and φ_p3 represents the phase difference of panel 3 relative to panel 0.

[0070] Codebook mode = 2, N g =2, antenna ports 3000 to 2999+P CSI-RS The precoding matrix for the one-layer CSI reporting codebook using l,m,p,n (1) =W l,m,p,n ^(1,N g ,2).

[0071] (PMI / Type 2 Codebook) - Type 2 Codebook For Type 2 CSI (Type 2 Codebook) in Rel. 15, the UE is configured with the higher layer parameter codebookType set to 'type II'.

[0072] In this disclosure, a matrix Z with X rows and Y columns may be expressed as Z(X×Y).

[0073] In Rel. 15, Type 2 CSI assumes that for a given layer l, the subband-wise (SB-wise) precoding matrix is ​​based on the following equation: l (N t ×N3) = W1W 2,l (F1)

[0074] N tis the number of antennas / antenna ports. N3 is the total number of precoding (beamforming) matrices (precoders) indicated by the PMI (number of subbands).

[0075] 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 horizontal and vertical polarization 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:

[0076] 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.

[0077] 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.

[0078] - Enhanced Type 2 Codebook (Rel. 16) For Type 2 CSI (enhanced Type 2 codebook) in Rel. 16, the UE is configured with the upper layer parameter codebookType set to 'typeII-r16'.

[0079] 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.

[0080] In Rel. 16 Type 2 CSI, the precoding matrix W for a given layer l is l is expressed by the following formula: W l = W1W ~ l W f,l H (F2)

[0081] 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

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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 It represents the number of combinations where one is chosen (combinatorial coefficient C(x,y)), and is also called the binomial coefficient.

[0086] 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).

[0087] The PMI subband size is given by CQI subband size / R, where R∈{1,2}. 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.

[0088] The multiple precoding matrix indicated by the PMI is L+M v is determined from vectors.

[0089] 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

[0090] M v The FD DFT vectors are initial ∈{-2M v +1,-2M v +2,...,0}, n 3,l =[n3,l (0) ,...,n 3,l (M_v-1) ], n 3,l (f) ∈{0,1,...,N3-1}.

[0091] 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 v In the FD DFT vectors, the index of the FD DFT vector f=0,1,...,M v The FD DFT vector for -1 is [y 0,l (f) ,y 1,l (f) ,...,y N_3-1,l (f) ] T is.

[0092] 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

[0093] Dominant M v M 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.

[0094] In the Rel. 16 extended type 2 codebook, L, β, p v The value of (codebook parameter combination, parameter combination) is determined by the upper layer parameter paramCombination-r16 (codebook combination setting).

[0095] 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.

[0096] 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.

[0097] The multiple PMI indices (PMI values, codebook indices) associated with different CSI Part 2 information may be as follows for the l-th layer: 1,1 : Rotation factor [q1 q2] in two-dimensional oversampling. q1∈{0,1,...,O1-1}, q2∈{0,1,...,O2-1}. ・i 1,2 : Multiple indices of the SD basis corresponding to each SD beam. i 1,2 ∈{0,1,...,C(N1N2,L)-1}. ・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(2Mv -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 2,3,l : Amplitude coefficient indicator of the coefficients (wideband) (both polarizations) of the lth layer. i 2,3,l =[k l,0 (1) k l,1 (1) ]. ・i 2,4,l : Amplitude coefficient indicator of reported coefficient (subband) of l-th layer. i 2,3,l =[k l,0 (2) ...k l,M_v-1 (2) ]. ・i 2,5,l : Phase coefficient indicator of the reported coefficient (subband) of the lth layer. 2,5,l =[c l,0,f ...c l,M_v-1,f ].

[0098] 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, and after remapping, 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. 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 * is given.

[0099] W ~ l Each reported LC coefficient (complex coefficient) in is a separately quantized amplitude and phase. - Amplitude quantization: Polarization specific reference amplitudes are calculated from the table defined in the specification (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}.

[0100] 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.

[0101] 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.

[0102] 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 equation:

[0103] 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,fdenotes 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.

[0104] 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: 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)

[0105] 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.

[0106] - 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'.

[0107] 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.

[0108] - 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 higher layer parameter codebookType set to 'typeII-PortSelection-r16'.

[0109] 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.

[0110] 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: W l (N t ×N3) = QW1W ~ l W f,l H (H1)

[0111] 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}.

[0112] 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.

[0113] Rel. 16 Type 2 PS CSI, like Rel. 16 Type 2 CSI, reduces the number of FD basis vectors from N3 to M v By reducing it to (M v <<N3>>, which reduces overhead compared to Rel. 15 Type 2 PS CSI.

[0114] - Further enhanced Type 2 port selection codebook (Rel. 17) For the Type 2 PS CSI / codebook in Rel. 17 (further enhanced Type 2 PS codebook), the UE is configured with the higher layer parameter codebookType set to 'typeII-PortSelection-r17'.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] Parameter combinations L, β, p for Rel. 16 type 2 codebooks v where 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.

[0119] In the Rel. 17 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 Rel. 17 supplemental enhanced type 2 PS codebook, α is the number of selected CSI-RS ports in the PS codebook, K1 = αP CSI-RS is a parameter for the calculation of M. M is the number of FD basis vectors. β is a parameter for the calculation of the maximum number of NZCs. The precoding matrix indicated by PMI is determined from L+M vectors, where L=K1 / 2 and K1=αP CSI-RS is.

[0120] 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.

[0121] Precoding matrix W for a given layer l l is expressed by the following formula: W l (K×N3) = W1W ~ l W f,l H (H2)

[0122] 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.

[0123] 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.

[0124] 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 l NZ ≦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.

[0125] 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. 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.

[0126] (JT) Joint transmission (JT) may refer to simultaneous data transmission from multiple points (eg, TRPs) to a single UE.

[0127] 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.

[0128] 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.

[0129] (NCJT CSI) In Rel. 17, the applicable scenario for NCJT CSI reporting is single-DCI-based MTRP NCJT with 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:

[0130] 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).

[0131] 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.

[0132] 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.

[0133] 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: 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.

[0134] 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.

[0135] 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).

[0136] 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.

[0137] (CJT CSI) 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 the inter-TRP coefficients can be matched by the current NR type 2 codebook.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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).

[0143] 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. f may be the same or different, and may be jointly or individually selected.

[0144] In the (Rel. 18) Type 2 codebook (codebook structure) for CJT multi-TRP (mTRP), at least one of the following modes (CJT codebook mode, CJT CSI mode) may be supported.

[0145] - Mode 1 is SD / FD basis selection per TRP / TRP group. It allows independent FD basis selection across N TRPs / TRP groups. For example, the codebook structure is given by the following equation: where N is the number of TRPs or TRP groups.

[0146] 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: where N is the number of TRPs or TRP groups.

[0147] In these two modes, detailed designs such as parameter combination, basis selection, TRP (group) selection, reference amplitude, and W2 quantization method may be shared.

[0148] For Type II CSI for CJT (enhanced Type II codebook for CJT) in Rel. 18, the UE may configure the higher layer parameter codebookType set to 'typeII-CJT-r18'. For Type II PS CSI for CJT (further enhanced Type II port selection codebook for CJT) in Rel. 18, the UE may configure the higher layer parameter codebookType set to 'typeII-CJT-PortSelection-r18'.

[0149] (Doppler CSI) Exploring / improving CSI reporting for UEs moving at high / medium speeds by utilizing time-domain correlation / Doppler-domain (DD) information is being considered. For example, improving 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 reporting time domain channel properties (TDCP, time domain correlation profile) measured via tracking CSI-RS (TRS) from the UE are being considered.

[0150] 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.

[0151] TRS is supported to track Doppler shift. However, TRS has the following issues: - 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.

[0152] 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.

[0153] The CMR can be used to measure the effect of Doppler shift, but the RS used for the measurement depends on the UE implementation.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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:

[0158] 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.

[0159] A d-slot may be of duration in DD units.

[0160] 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 to indicate the position of the last CSI-RS occasion used for CSI reporting.

[0161] For the parameter δ, an additional value of 2 is supported.

[0162] N4 is configured by the base station via higher layer signaling.

[0163] For N4=1, the DD basis may be identity. There may be no DD compression. The codebook structure in this case may be, for example,

[0164] For N4>1, the Doppler domain orthogonal DFT basis may be selected commonly for all SD / FD bases. The codebook structure in this case may be, for example,

[0165] 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.

[0166] For Type II CSI for predicted PMI (enhanced Type II codebook for predicted PMI) in Rel. 18, the UE may configure the higher layer parameter codebookType set to 'type II-Doppler-r18'. For Type II PS CSI for predicted PMI (further enhanced Type II port selection codebook for predicted PMI) in Rel. 18, the UE may configure the higher layer parameter codebookType set to 'type II-Doppler-PortSelection-r18'.

[0167] (CSI-RS) 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.

[0168] 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.

[0169] 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).

[0170] 2A to 2D are diagrams showing examples of FD-OCC and TD-OCC. The FD-OCC series is ｆ (k'), and the TD-OCC series is w ｔ (k'). Figure 2A shows the case where the CDM type is no CDM. Figure 2B shows the case where the CDM type is FD-CDM2. Figure 2C shows the case where the CDM type is CDM4. Figure 2D shows the case where the CDM type is CDM8.

[0171] Fig. 3 is a diagram showing an example of CSI-RS positions for each number of ports based on Fig. 1. This diagram shows the frequency density, component resource size (size in the frequency direction [RE], size in the time direction [symbol]), and CDM type for each number of ports.

[0172] For example, Figure 4 shows an example of resource element (RE) mapping of CSI-RS in which the number of ports is set to 32 and the component resource size is set to 2 subcarriers x 2 symbols (row index 17 in Figure 1). In the frequency domain and time domain of 1 physical resource block (PRB) x 1 slot, 4 component resources of 2 subcarriers x 2 symbols are multiplexed (frequency division multiplexing (FDM)) in the frequency domain and 2 component resources are multiplexed (time division multiplexing (TDM)) in the time domain, thereby mapping 4 x 2 component resources. Furthermore, the CSI-RS in each component resource is multiplied by a 2-subcarrier FD-OCC and a 2-symbol TD-OCC, thereby multiplexing 4 CSI-RS (code division multiplexing (CDM)) (CDM4, FD2TD2). Therefore, 32-port CSI-RS are transmitted in a resource of 1 PRB x 1 slot.

[0173] Since the maximum number of CSI-RS ports is 32, which is greater than the maximum number of layers, 8, the UE can measure many channel conditions, improving measurement accuracy.

[0174] In Rel. 19 and later, massive MIMO using more than 32 ports is being considered.

[0175] (Considerations) The following considerations are possible: - Consideration 1: For more than 32 CSI-RS ports, the base station antenna layout and settings have not been sufficiently considered. - Consideration 2: For more than 32 CSI-RS ports, the supported codebooks / CSI types have not been sufficiently considered.

[0176] If these considerations are not made clear, there is a risk that communication quality / throughput will decline.

[0177] Therefore, the present inventors have conceived a method for setting / reporting more CSI-RS ports.

[0178] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Note that each of the following embodiments (e.g., each case) may be used alone or in combination of at least two of them.

[0179] 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."

[0180] In the present disclosure, terms such as activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0181] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, 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.

[0182] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0183] 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.

[0184] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0185] In this disclosure, a b , a_b, and a with b added to the bottom right of a may be read interchangeably. c , a^c, and the notation of a with c added to the upper right of a may be read interchangeably. b c , a_b^c, a notation with b added to the bottom right of a and c added to the top right, may be read as interchangeable. In the present disclosure, ceil(x), ceiling function, and ceiling function may be read as interchangeable. In the present disclosure, floor(x), floor function, and floor function may be read as interchangeable. In the present disclosure, x ~ may be expressed by adding 〜 to the x, or may be referred to as x tilde. - may be represented by an x ​​with a - or may be called an x-bar.

[0186] In this disclosure, the following abbreviations may be used: time division multiplexing (TDM); time-division-multiplexed (TDM); frequency division multiplexing (FDM); frequency-division multiplexed (FDM).

[0187] In the present disclosure, the terms port, CSI-RS port, and antenna port may be interchangeable. In the present disclosure, the terms CSI-RS resource, CSI-RS configuration, and time and frequency resource for CSI-RS may be interchangeable.

[0188] In the present disclosure, beam, precoding, precoder, quasi co-location (QCL) assumption, QCL relationship, transmission configuration indicator (TCI) state, spatial domain filter, spatial domain receive filter, spatial domain transmit filter, reference signal (RS), and spatial receive parameter may be interchangeable.

[0189] In the present disclosure, the terms "existing CSI-RS resource" and "CSI-RS resource of Rel. 15" may be interchangeable. The terms "additional CSI-RS resource," "CSI-RS resource not included in Rel. 15," and "CSI-RS resource added in a new release" may be interchangeable.

[0190] In the present disclosure, applying an OCC to a CSI-RS and multiplying a CSI-RS by an OCC may be interchangeable. In the present disclosure, applying an OCC to a received signal, multiplying a received signal by an inter-PRB OCC, and dividing a received signal by the inter-PRB OCC may be interchangeable.

[0191] (Wireless Communication Method) <Embodiment A1> <Inter-PRB OCC> An OCC spanning multiple PRBs (frequency-domain OCC, inter-PRB OCC (inter-PRB OCC)) may be applied to the CSI-RS. Each value (element) in the inter-PRB OCC may be applied to each PRB. Each value in the inter-PRB OCC may be applied to more than one PRB. Each value in the inter-PRB OCC may be applied to each precoding resource block group (PRG).

[0192] A PRG may be consecutive PRBs to which the same DL precoding is applied. The UE may assume that the same precoding is applied to consecutive DL allocations of multiple PRBs within a PRG.

[0193] The inter-PRB OCC may be applied to consecutive PRBs, for example, as shown in Figure 5A, an inter-PRB OCC of length 2 may be applied to PRB #0 and PRB #1.

[0194] Inter-PRB OCC may be applied to non-consecutive PRBs. The non-consecutive PRBs may be PRBs with even PRB indices among the multiple PRBs configured in the CSI-RS resources, PRBs with odd PRB indices among the multiple PRBs configured in the CSI-RS resources, PRBs with a certain number of PRB intervals among the multiple PRBs configured in the CSI-RS resources, a comb configuration for the multiple PRBs configured in the CSI-RS resources, or may be specified in order from the lowest PRB (PRB with the smallest index) or the highest PRB (PRB with the largest index) among the multiple PRBs configured in the CSI-RS resources.

[0195] For example, as shown in FIG. 5B, an inter-PRB OCC [w f (0) w f (1)] may be applied to PRB#0 and PRB#2 with even PRB indices. f (0) w f (1)] may be [+1 +1] or [+1 −1].

[0196] When the CSI-RS is mapped only to PRBs with odd PRB indices or PRBs with even PRB indices, inter-PRB OCC may not be applied. When the CSI-RS is mapped only to PRBs with odd PRB indices or PRBs with even PRB indices, inter-PRB OCC may be applied.

[0197] For each inter-PRB OCC length, an association (e.g., a table) between the OCC index i and the inter-PRB OCC value may be defined. Each inter-PRB OCC value may be defined using a cyclic shift α (e.g., exp(jα·m), exp(j2πφ(m) / N), etc.).

[0198] If the inter-PRB OCC length is 2, the inter-PRB OCC may be a Rel. 15 time-domain OCC (double-symbol OCC). The inter-PRB OCC may be defined with a cyclic shift α={0,π}.

[0199] When the inter-PRB OCC length is 4, the inter-PRB OCC may be defined by a table or may be defined using a cyclic shift. The inter-PRB OCC may be defined using a cyclic shift α={0, π / 2, π, 3π / 2}.

[0200] When the inter-PRB OCC length is 3, the inter-PRB OCC may be defined using a cyclic shift α={0, π / 3, 2π / 3} or by a table containing values ​​resulting from the cyclic shift. The cyclic shift α may be {0, −π / 3, −2π / 3}.

[0201] For example, based on the table of Figure 6A, a CSI-RS to which inter-PRB OCC [+1 +1] with OCC index = 0 is applied is the same as a CSI-RS to which inter-PRB OCC is not applied, and is therefore received and measured by the same operations as in Rel. 15 and is received by Rel. 15 UEs and new release UEs. A CSI-RS to which inter-PRB OCC [+1 -1] with OCC index = 1 is applied is received and measured only by new release UEs.

[0202] For example, based on the table of Figure 6B, a CSI-RS to which inter-PRB OCC [exp(j0 * 0) exp(j0 * 1) exp(j0 * 2)] (same as [+1 +1 +1]) with OCC index = 0 is applied is the same as a CSI-RS to which inter-PRB OCC is not applied, and is therefore received and measured by the same operation as in Rel. 15 and is received by Rel. 15 UEs and new release UEs. CSI-RS to which inter-PRB OCC with OCC index = 1 or 2 is applied is received and measured only by new release UEs.

[0203] For example, based on the table of Figure 6C, a CSI-RS to which inter-PRB OCC [+1 +1 +1 +1] with OCC index = 0 is applied is the same as a CSI-RS to which inter-PRB OCC is not applied, and is therefore received and measured by the same operation as in Rel. 15 and is received by Rel. 15 UEs and new release UEs. CSI-RS to which inter-PRB OCC with OCC index = 1, 2, or 3 is applied is received and measured only by new release UEs.

[0204] <UE Operation> A UE that supports inter-PRB OCC (e.g., a new release UE) may measure the CSI-RS obtained by multiplying a value in the inter-PRB OCC for each PRB and adding the obtained multiple multiplication results (in-phase combining).

[0205] A UE that does not support inter-PRB OCC or is not configured with inter-PRB OCC (e.g., an older release UE) may measure the CSI-RS obtained by adding up the received signals of each PRB of multiple PRBs.

[0206] The UE does not need to assume that the time and frequency resources of the CSI-RS to which inter-PRB OCC is applied only partially overlap with the time and frequency resources of the CSI-RS of another UE. For example, as shown in FIG. 7A , the UE does not need to assume a case in which the new release CSI-RS is mapped to PRBs #0 and #1 to apply inter-PRB OCC, and the old release CSI-RS is mapped to PRB #1. In such a case, the new release CSI-RS and the old release CSI-RS are not orthogonal (cannot be separated by the UE).

[0207] All of the time and frequency resources of the CSI-RS to which inter-PRB OCC is applied may overlap with all of the time and frequency resources of the CSI-RS of other UEs. For example, as shown in Figure 7B, the new release CSI-RS may be mapped to PRBs #0 and #1 to apply inter-PRB OCC, and the old release CSI-RS may be mapped to PRBs #0 and #1. In such a case, the new release CSI-RS and the old release CSI-RS are orthogonal (can be separated by the UE).

[0208] The transmission bandwidth (number of PRBs) of the CSI-RS may be a multiple of the inter-PRB OCC length. The UE may assume that the transmission bandwidth (number of PRBs) of the CSI-RS is a multiple of the inter-PRB OCC length. The UE may measure the CSI-RS by applying the inter-PRB OCC over a bandwidth that is a multiple of the inter-PRB OCC length.

[0209] By summing the received signals per PRB over multiples of the inter-PRB OCC length, an older release UE can measure only the CSI-RS where inter-PRB OCC does not apply (corresponding to inter-PRB OCCs with all +1 values) and can filter out the CSI-RS corresponding to other inter-PRB OCCs.

[0210] If the transmission bandwidth of the CSI-RS is not a multiple of the inter-PRB OCC length, the UE may measure only the bandwidth of the CSI-RS that is a multiple of the inter-PRB OCC length, and may not measure the remaining band. For example, if the inter-PRB OCC length is 2, the UE may apply the inter-PRB OCC to the received signal of the CSI-RS resource every two PRBs (the corresponding value of the inter-PRB OCC may be applied to the received signal of each of the two PRBs). The UE may not measure the remaining band that is smaller than two PRBs.

[0211] Even in a case such as that shown in Figure 7B above, if an older release UE does not know the inter-PRB OCC length, it may not be able to measure the CSI-RS properly, and the new release CSI-RS may cause interference.

[0212] For multiple CSI-RSs transmitted using the same precoding, in the absence of channel fluctuations, the measurement accuracy of the CSI-RSs is improved by combining the CSI-RSs in phase.

[0213] The old release UE may in-phase combine the received signal (complex number) of the CSI-RS for each PRB in the PRG. By this operation, the old release UE can measure the CSI-RS by the same receiving operation as when all +1 inter-PRB OCC is applied, even if it does not know that inter-PRB OCC is applied. Therefore, the old release CSI-RS and the new release CSI-RS are orthogonalized.

[0214] The inter-PRB OCC length may be the number of PRBs in a PRG. Alternatively, the CSI-RS may be mapped to all PRBs in a PRG and the inter-PRB OCC may be applied.

[0215] The inter-PRB OCC length may be the number of PRBs to which the CSI-RS is mapped in the PRG. For example, assume that one PRG is 4 PRBs, the CSI-RS is mapped to 2 PRBs in the PRG, and the inter-PRB OCC length is 2. In this case, the old release UE performs reception operations equivalent to when inter-RB OCC [+1 +1] is applied by in-phase combining the received signal of the CSI-RS in the PRG and measuring the CSI-RS, even if it does not know that inter-PRB OCC has been applied. This allows the old release UE to suppress interference from the new release CSI-RS and measure the old release CSI-RS. In this case, since the new release UE knows that inter-PRB OCC has been applied, it applies inter-PRB OCC [+1 -1] and in-phase combines the received signal of the CSI-RS in the PRG to measure the CSI-RS. This allows the new release UE to measure the new release CSI-RS while reducing interference from the old release CSI-RS.

[0216] If the number of PRBs in a PRG is not a multiple of the inter-PRB OCC length, the UE may measure only the bandwidth of the PRG that is a multiple of the inter-PRB OCC length, and not measure the remaining bandwidth.

[0217] [Measurement of the Entire Resource Range] A CSI-RS to which inter-PRB OCC is applied may be transmitted to another UE in the same time and frequency resources as a CSI-RS to which inter-PRB OCC is applied or a CSI-RS to which inter-PRB OCC is not applied. A UE may measure a CSI-RS corresponding to a specific inter-PRB OCC by receiving a CSI-RS within a resource range (e.g., a band) to which inter-PRB OCC may be applied.

[0218] In the example of Figure 8, CSI-RS #0-0 in PRB #0 and CSI-RS #1-0 in PRB #1 are mapped to the same position in the same slot within each PRB and have the same CSI-RS sequence (transmission signal sequence).

[0219] A UE configured with CSI-RS resources to which inter-PRB OCC (e.g., [+1 +1]) with all values ​​of +1 is applied, or a UE configured with CSI-RS resources to which inter-PRB OCC is not applied, may measure the CSI-RS in each PRB without using the inter-PRB OCC, provided that the CSI-RS of another UE multiplexed on the time and frequency resources of the CSI-RS is not transmitted.

[0220] If inter-PRB OCC may be applied, the UE cannot accurately measure the CSI-RS in each PRB without knowing the inter-PRB OCC.

[0221] Within a resource range where an inter-PRB OCC may be applied, the UE may measure the CSI-RS corresponding to the particular inter-PRB OCC by applying the particular inter-PRB OCC, all of which have a value of +1, to the entire received signal in the resource range.

[0222] A resource range in which inter-PRB OCC may be applied may be specified in a specification or may be configured in a UE by higher layer signaling. The resource range may be indicated in units of 2 PRBs (a pair of an even PRB index and an odd PRB index), 3 PRBs, or 4 PRBs. The UE may determine the resource range in which inter-PRB OCC is applied based on the configured CSI-RS resource band (PRB).

[0223] The UE may be notified of whether inter-PRB OCC is applied by at least one of higher layer signaling, MAC CE, and DCI. The UE may switch its reception operation according to this notification. For example, a UE notified that inter-PRB OCC is not applied (or that CSI-RS for other UEs are not multiplexed into the CSI-RS time and frequency resources) may measure the CSI-RS in each of at least one PRB within the resource range, or may in-phase combine multiple PRBs within the CSI-RS resource. For example, a UE notified that inter-PRB OCC is applied (or that CSI-RS for other UEs are multiplexed into the CSI-RS time and frequency resources) may identify the inter-PRB OCC based on the received signals of all PRBs and measure the CSI-RS to which the identified inter-PRB OCC is applied.

[0224] According to this embodiment, by applying inter-PRB OCC to CSI-RSs across multiple PRBs, it is possible to increase the number of orthogonalized (multiplexed) CSI-RSs (ports).

[0225] <Embodiment A2> <Inter-Time-Field OCC> An OCC spanning multiple time fields in the time domain (time-domain OCC, inter-time-field OCC) may be applied to the CSI-RS. Each value (element) in the inter-time-field OCC may be applied to each time field (period). The time field may be any of a subframe, slot, subslot, minislot, or symbol. The time field may be longer than a symbol.

[0226] An inter-time field OCC may be applied to consecutive time fields. For example, as shown in FIG. 9, if the time fields are slots and an inter-slot OCC of length 2 [w t (0) w t (1)] may be applied to slot #0 and slot #1. t (0) w t (1)] may be [+1 +1] or [+1 −1].

[0227] For the inter-time field OCC, similarly to the inter-PRB OCC of embodiment A1, an association (e.g., a table) between the OCC index i and the inter-time field OCC value may be defined for each inter-time field OCC length. Each value of the inter-time field OCC may be defined using a cyclic shift α (e.g., exp(jα·m), exp(j2πφ(m) / N), etc.). When the OCC length is 2, each value of the inter-time field OCC may be defined using a cyclic shift α={0, π}. When the OCC length is 3, the OCC may be defined using a cyclic shift α={0, π / 3, 2π / 3} or may be defined by a table containing values ​​obtained from the cyclic shift. The cyclic shift α may be {0, −π / 3, −2π / 3}. When the OCC length is 4, the OCC may be defined by a table or may be defined using a cyclic shift α={0, π / 2, π, 3π / 2}. As in the case where the OCC length is 3, the order of the values ​​of the cyclic shift α may be reversed.

[0228] The inter-time field OCC may be applied to non-consecutive time fields, which may be multiple time fields with even indexes within a period configured for the CSI-RS resources, multiple time fields with odd indexes within a period configured for the CSI-RS resources, multiple time fields spaced apart by a certain number of time fields within a period configured for the CSI-RS resources, or may be specified in order from the earliest (smallest index) or latest (largest index) time field within a period configured for the CSI-RS resources.

[0229] When the CSI-RS is mapped only to the time fields with odd indices or the time fields with even indices, the inter-time-field OCC may not be applied. When the CSI-RS is mapped only to the time fields with odd indices or the time fields with even indices, the inter-time-field OCC may be applied. In this case, orthogonality other than the inter-time-field OCC can be maintained, and degradation of measurement quality can be prevented.

[0230] The inter-time-field OCC length may be the number of time fields (eg, slots) within an application period (eg, radio frame) consisting of a given number of time fields.

[0231] If sequence hopping of CSI-RS is performed within the application period, it is possible that the orthogonality between multiple inter-time-field OCCs multiplexed within the application period may be lost. Therefore, sequence hopping may be stopped in a resource range where the inter-time-field OCC may be applied.

[0232] The CSI-RS sequence may be a pseudo-random sequence (a pseudo-noise (PN) sequence, for example, a Gold sequence, a Gold sequence of length 31, or an M sequence). In Rel. 15, the initial value c used to determine the CSI-RS sequence is init is based on the slot index and the symbol index.

[0233] If inter-time field OCC (inter-slot OCC) is applied between slots over the application period, sequence hopping within the application period may be stopped (c of the first or last symbol init may be applied to all symbols within the application period).

[0234] c init Since is set uniquely to the UE, the network (e.g., base station) can set c init A scrambling ID (e.g., scramblingID) for may be configured in the UE by higher layer signaling.

[0235] <UE Operation> A UE that supports inter-time-field OCC (e.g., a new release UE) may measure the CSI-RS obtained by multiplying the values ​​in the inter-time-field OCC for each time field and adding the multiplication results (in-phase combining).

[0236] A UE that does not support inter-time-field OCC or is not configured for inter-time-field OCC (e.g., an older release UE) may measure the CSI-RS obtained by adding the received signals of each time field of multiple time fields.

[0237] The UE does not need to assume that the time and frequency resources of the CSI-RS to which inter-time field OCC is applied overlap with part of the time and frequency resources of the CSI-RS of other UEs.

[0238] All of the time and frequency resources of the CSI-RS to which inter-time field OCC is applied may overlap with all of the time and frequency resources of the CSI-RS of other UEs.

[0239] The duration (number of time fields) of the CSI-RS may be a multiple of the OCC length between time fields.

[0240] An older release UE can measure only the CSI-RS for which the inter-time field OCC does not apply (corresponding to the inter-time field OCCs with all +1 values) by summing the received signals for each time field over multiples of the inter-time field OCC length, and can filter out the CSI-RS corresponding to other inter-time field OCCs.

[0241] If the transmission bandwidth of the CSI-RS is not a multiple of the inter-time-field OCC length, the UE may measure only the period of the CSI-RS that is a multiple of the inter-time-field OCC length, and not measure the remaining period.

[0242] [Measurement of the Entire Resource Range] A CSI-RS to which an inter-time-field OCC is applied may be transmitted to another UE in the same time and frequency resources as a CSI-RS to which an inter-time-field OCC is applied or a CSI-RS to which an inter-time-field OCC is not applied. A UE may measure a CSI-RS corresponding to a specific inter-time-field OCC by receiving a CSI-RS within a resource range (e.g., a period) to which the inter-time-field OCC may be applied.

[0243] A UE configured with CSI-RS resources to which inter-time-field OCCs with all values ​​of +1 (e.g., [+1 +1]) are applied, or a UE configured with CSI-RS resources to which no inter-time-field OCC is applied, may measure the CSI-RS in each time field without using the inter-time-field OCC, provided that no CSI-RS of other UEs multiplexed onto the time and frequency resources of the CSI-RS is transmitted.

[0244] If an inter-time-field OCC may be applied, the UE cannot accurately measure the CSI-RS in each time field without knowing the inter-time-field OCC.

[0245] Within a resource range where an inter-time-field OCC may be applied, the UE may measure the CSI-RS corresponding to the particular inter-time-field OCC by applying the particular inter-time-field OCC, which has all values ​​of +1, to the entire received signal in the resource range.

[0246] The resource range to which the inter-time-field OCC may be applied may be specified in the specification or may be configured in the UE by higher layer signaling. The resource range may be indicated in units of two time fields (a pair of an even time field index and an odd time field index), three time fields, or four time fields. The UE may determine the resource range to which the inter-time-field OCC may be applied based on the duration (number of symbols) of the configured CSI-RS resource.

[0247] The UE may be notified of whether inter-time-field OCC is applied by at least one of higher layer signaling, MAC CE, and DCI. The UE may switch its reception operation according to this notification. For example, a UE notified that inter-time-field OCC is not applied (or that CSI-RSs for other UEs are not multiplexed into the time and frequency resources of the CSI-RS) may measure the CSI-RS in each of at least one time field within the resource range, or may perform in-phase combining of multiple time fields within the CSI-RS resource. For example, a UE notified that inter-time-field OCC is applied (or that CSI-RSs for other UEs are multiplexed into the time and frequency resources of the CSI-RS) may identify the inter-time-field OCC based on the received signals of all time fields and measure the CSI-RS to which the identified inter-time-field OCC is applied.

[0248] According to this embodiment, by applying inter-time-field OCC to CSI-RSs across multiple time fields, the number of orthogonalized (multiplexed) CSI-RSs (ports) can be increased.

[0249] <Embodiment A3> Rel. 15 supports up to 32 CSI-RS ports using 32 resources (REs, subcarriers × symbols) within one PRB. The number of CSI-RS ports may be increased by increasing the time and frequency resources per PRB.

[0250] The UE may receive the CSI-RS using at least one resource (time and frequency resource) not used for the CSI-RS (existing CSI-RS resource) of Rel. 15. As shown in Fig. 10, new CSI-RS resources (additional CSI-RS resources) may be defined for symbols #2, #3, #9, and #10 in addition to the existing CSI-RS resources. As a result, 64 REs of CSI-RS resources are used within one PRB, and can be associated with 64 ports.

[0251] At least one of a time domain OCC and a frequency domain OCC may be applied to the additional CSI-RS resources.

[0252] To maintain compatibility with Rel. 15, at least one of the time-domain OCC and the frequency-domain OCC of Rel. 15 may be applied to the CSI-RS, and then at least one of the additional time-domain OCC and the frequency-domain OCC (additional OCC) may be applied.

[0253] For example, as shown in Figure 11, after at least one of the time-domain OCC and the frequency-domain OCC of Rel. 15 is applied to the existing CSI-RS resources and the additional CSI-RS resources in Figure 10, an additional time-domain OCC w t '(m) is applied. t '(0) w t '(1)] may be [+1 +1] or [+1 −1]. Each value of the additional time-domain OCC may be applied every two symbols.

[0254] In this example, symbols #4 and #5 are t '(0) is applied to symbols #2 and #3. t '(1) is applied, and symbols #11 and #12 are t '(0) is applied to symbols #9 and #10. t '(1) applies.

[0255] The first value of the additional OCC (e.g., w t '(0)) is always +1, and the value of CSI-RS does not change even when an additional OCC is applied. Therefore, the first value of the additional OCC (for example, w t '(0)) is applied to the additional CSI-RS resource, and the value after the beginning of the additional OCC (for example, w t '(1)) may be applied, which allows the old release UE to measure the CSI-RS and increases the number of ports for the new release CSI-RS.

[0256] [w t '(0) w t'(1)] may be applied in order from a larger symbol index to a smaller symbol index, or from a smaller symbol index to a larger symbol index. For example, if w is applied to symbols #2 and #3, t '(0) is applied to symbols #4 and #5. t '(1) may apply.

[0257] According to this embodiment, it is possible to increase the time and frequency resources for CSI-RS and increase the number of CSI-RS ports.

[0258] Embodiment A4 In Rel. 15, the UE does not assume that the REs for the CSI-RS are the same as the REs for the DMRS, which reduces the flexibility of the configuration of at least one of the CSI-RS and the DMRS.

[0259] The CSI-RS may be punctured.

[0260] In the present disclosure, puncturing the CSI-RS, not mapping the CSI-RS to some of the time and frequency resources of the CSI-RS, and not transmitting some of the CSI-RS may be interpreted as interchangeable.

[0261] In resources to which the CSI-RS for a certain UE is not mapped due to puncturing, a signal (eg, CSI-RS) for another UE may be transmitted.

[0262] Puncturing may be performed in units of a certain size of time and frequency resources (eg, component resources, resources to which frequency-domain OCC is applied, or resources to which time-domain OCC is applied).

[0263] The CSI-RS may be transmitted based on at least one of the following CSI-RS resource control methods 1 to 3.

[0264] <<CSI-RS Resource Control Method 1>> The NZP-CSI-RS may be punctured in the configured zero power (ZP)-CSI-RS. The NZP-CSI-RS may be mapped to resources configured for the NZP-CSI-RS, excluding the resources configured for the ZP-CSI-RS.

[0265] When the time and frequency resources of the ZP-CSI-RS and the time and frequency resources of the NZP-CSI-RS at least partially overlap, the UE may not receive the NZP-CSI-RS in the overlapping REs, may not receive the NZP-CSI-RS in the overlapping PRBs, may not receive the ZP-CSI-RS in the overlapping REs, may not receive the ZP-CSI-RS in the overlapping PRBs, may not assume that a DMRS will be configured (or mapped) on the overlapping resources, may measure (receive) at least one of the ZP-CSI-RS and the NZP-CSI-RS on the overlapping resources when a DMRS is configured (or mapped) on the overlapping resources, or may measure (receive) the DMRS on the overlapping resources when a DMRS is configured (or mapped) on the overlapping resources.

[0266] <<CSI-RS Resource Control Method 2>> The UE may be notified of a bitmap indicating puncturing positions (e.g., at least one of time and frequency positions) among the time and frequency resources of the CSI-RS. The bitmap may be included in the CSI-RS resources. The UE may puncture the CSI-RS at the positions indicated by the bitmap. The UE may puncture the NZP-CSI-RS or the ZP-CSI-RS at the positions indicated by the bitmap.

[0267] Each bit in the bitmap may correspond to an RE (subcarrier) or a PRB. The UE may not receive the NZP-CSI-RS in the RE indicated by the bitmap, or may not receive the NZP-CSI-RS in the PRB indicated by the bitmap. The UE may not receive the ZP-CSI-RS in the RE indicated by the bitmap, or may not receive the ZP-CSI-RS in the PRB indicated by the bitmap. A DMRS may not be configured (or mapped) to the resource indicated by the bitmap. The UE may not assume that a DMRS will be configured (or mapped) to the resource indicated by the bitmap. A DMRS may be configured (or mapped) to the resource indicated by the bitmap, and the UE may receive or measure the DMRS on the resource indicated by the bitmap.

[0268] <<CSI-RS Resource Control Method 3>> When the CSI-RS is punctured based on CSI-RS Resource Control Method 1 or 2, the PDSCH does not need to be transmitted in resources to which the CSI-RS is not mapped due to puncturing (it does not need to be mapped to the punctured position).

[0269] In a resource to which the CSI-RS is not mapped by puncturing, the PDSCH may be rate-matched or punctured, and the UE may assume that the PDSCH will be rate-matched or punctured in that resource.

[0270] In a resource to which the CSI-RS is not mapped due to puncturing, the PDSCH may not be rate-matched or punctured. The UE may assume that the PDSCH is not rate-matched or punctured in that resource. In a resource to which the CSI-RS is not mapped due to puncturing, the PDSCH may be transmitted (the PDSCH may be mapped to that resource).

[0271] The UE may be notified of the position where the PDSCH is rate matched or punctured. The position where the PDSCH is rate matched or punctured may be notified as antenna port information, may be notified as a CDM group of the CSI-RS, or may be notified as a subcarrier number (e.g., k0) and a symbol number (e.g., l0).

[0272] According to this embodiment, the CSI-RS is appropriately punctured and resources to which the CSI-RS is not mapped due to puncturing are appropriately handled, thereby increasing the flexibility of the CSI-RS configuration.

[0273] <Embodiment A5> Multiple groups of CSI-RS resources (CSI-RS resource groups) may be associated with different groups of CSI-RS ports (CSI-RS port groups).

[0274] The multiple CSI-RS resource groups may be grouped according to at least one of the following CSI-RS resource grouping methods 1 and 2.

[0275] <<CSI-RS Resource Grouping Method 1>> At least one of the time and frequency resources for the CSI-RS may be different among multiple CSI-RS resource groups.

[0276] Multiple CSI-RS resource groups may be multiplexed with one another using at least one of FDM and TDM. For example, as shown in FIG. 12, CSI-RS resource groups #0 and #1 may be TDM. CSI-RS resource group #0 may be associated with a group of CSI-RS ports #0 to #31, and CSI-RS resource group #1 may be associated with a group of CSI-RS ports #32 to #64. CSI-RS resource group #0 may be an existing CSI-RS resource, and CSI-RS resource group #1 may be an additional CSI-RS resource.

[0277] Entries (rows) containing groups of additional CSI-RS resources may be added to a table such as that of Figure 1. Entries indicating numbers of ports greater than 32 may also be added to the table.

[0278] In a table showing existing CSI-RS resources and additional CSI-RS resources, additional CSI-RS resources may be added to both entries showing a port number of 32 or less (low-order port number) and entries showing a port number of more than 32 (high-order port number), or additional CSI-RS resources may be added only to entries showing a high-order port number.

[0279] The UE may be configured with additional CSI-RS resources by higher layer signaling. The UE may be configured with existing CSI-RS resources by higher layer signaling and determine the additional CSI-RS resources using at least one of a time and a frequency offset. For example, in the example of FIG. 12 , the UE may determine the additional CSI-RS resources by adding an offset of −2 symbols in the time direction to the existing CSI-RS resources.

[0280] Since multiple CSI-RS resource groups are orthogonalized by time and frequency resources, UEs can receive without using a new OCC, improving compatibility with older release UEs.

[0281] <<CSI-RS Resource Grouping Method 2>> Among multiple CSI-RS resource groups, a CSI-RS sequence and an initial value c used to determine the CSI-RS sequence are determined. init At least one of the scramble IDs for may be different.

[0282] For example, as shown in Figure 13, CSI-RS resource groups #0 and #1 may be associated with different scrambling IDs. CSI-RS resource group #0 may be associated with a group of CSI-RS ports #0 to #31, and CSI-RS resource group #1 may be associated with a group of CSI-RS ports #32 to #64. CSI-RS resource group #0 may be an existing CSI-RS resource, and CSI-RS resource group #1 may be an additional CSI-RS resource.

[0283] The association between at least one of the CSI-RS sequence and scrambling ID and at least one of the CSI-RS resource and CSI-RS port may be specified in the specification. For example, the CSI-RS of ports #0 to #X-1 may be specified in the table showing the existing CSI-RS resource (e.g., FIG. 1) and the table showing the CSI-RS resource specified in the previous release. init The CSI-RS of ports #X to #2X-1 is determined based on the table and the modified c init It may be determined based on:

[0284] c init and deformation c init may be based on different upper layer parameters (e.g., different scrambling IDs, scramblingID and scramblingID_2).

[0285] The UE is init Set a scrambling ID (e.g., a different scrambling ID) for c init Using a different calculation, based on the scramble ID, init For example, the UE may calculate a value obtained by adding a specific value to the configured scrambling ID as the modified c init As a scramble ID for init By using it in the calculation formula, the transformation c init The specific value may be a cell ID, etc. The UE may calculate the modified c by adding the specific value to the configured scrambling ID and performing a modulo operation. initmay be calculated.

[0286] In a table showing existing CSI-RS resources and additional CSI-RS resources, additional CSI-RS resources may be added to both entries showing a port number of 32 or less (low-order port number) and entries showing a port number of more than 32 (high-order port number), or additional CSI-RS resources may be added only to entries showing a high-order port number.

[0287] Since the CSI-RS sequence (pseudo-random sequence) has little correlation with other sequences, the time and frequency resources of the CSI-RS associated with a low port number (e.g., a number less than half the number of ports) (e.g., existing CSI-RS resources) and the time and frequency resources of the CSI-RS associated with a high port number (e.g., a number equal to or greater than half the number of ports) (e.g., additional CSI-RS resources) may overlap in whole or in part.

[0288] The UE may be configured with additional CSI-RS resources by higher layer signaling. The UE may be configured with existing CSI-RS resources by higher layer signaling and may determine the additional CSI-RS resources using at least one offset in time and frequency. For example, in the example of FIG. 13 , the UE may determine the time and frequency resources for the additional CSI-RS by adding an offset of 0 symbols in the time direction and an offset of 0 PRBs in the frequency direction to the existing CSI-RS resources. The UE may assume that the additional CSI-RS resources completely overlap with the existing CSI-RS resources in time and frequency.

[0289] Since multiple CSI-RS resource groups are distinguished by CSI-RS sequences, UEs can receive signals without using a new OCC, improving compatibility with older release UEs. Even if the CSI-RS sequences (pseudo-random sequences) are not completely orthogonal, interference between ports can be reduced by applying different precoding (beams) between ports.

[0290] <Considerations> 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 23 CSI-RS ports.

[0291] <Embodiment B1> In this embodiment, more than 32 ports are not introduced for the same CSI-RS resource (time and frequency resource), and different CSI-RS resources may use different CSI-RS ports. Multiple CSI-RS resources may be aggregated for a new UE.

[0292] 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.

[0293] According to this embodiment, 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.

[0294] As in the example of Figure 14, CSI-RS resource #1 and CSI-RS resource #2 may be configured to be FDM-modulated, 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.

[0295] As in the example of Figure 15, TDM CSI-RS resource #1 and CSI-RS resource #2 may be configured, CSI-RS resource #1 may be associated with CSI-RS ports #0 to #31, and CSI-RS resource #2 may be associated with CSI-RS ports #32 to #63.

[0296] 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, ...).

[0297] 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 B1-X below.

[0298] <<Embodiment B1-1>> 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).

[0299] <<Embodiment B1-2>> Multiple 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 multiple 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: Multiple 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.

[0300] <<Embodiment B1-3>> 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.

[0301] <Base Station Antenna Layout> Figure 16 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 17 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).

[0302] <Configuration / Measurement / Reporting of CSI> The UE may acquire CSI by measuring a CSI-RS (resource) using a port to which at least one of embodiments A1 to A5 and embodiment B1 is applied. The configuration / reporting of the CSI may be in accordance with at least one of embodiments C1 and C2 below.

[0303] <Embodiment C1> This embodiment relates to the above-mentioned study 1.

[0304] The novel antenna layout and configuration for CSI-RS with more than 32 ports may follow at least one of the following options:

[0305] - 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.

[0306] 18 shows an example of a configuration according to Option 1 of embodiment C1. 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).

[0307] - 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.

[0308] 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 set, which respectively indicate the number of CSI-RS ports (>32) and (N1, N2). Figure 19 shows a first example of the setting according to option 2 of embodiment C1. At least one combination in this table may be supported. This table specifies 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.

[0309] N gmay be set as a new parameter joint with the (N1,N2) setting. For example, (N g , N1, N2) may be configured. FIG. 20 shows a second example of the configuration according to option 2 of embodiment C1. At least one row in 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.

[0310] The UE is g It may be appreciated that only one dimension is extended by a value. As an example of FIG. 21A, 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. 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.

[0311] - 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.

[0312] (N g1 ,N g2 ) may be set as a separate parameter from the (N1, N2) setting. For example, (N g1 ,N g2Two parameters ng1-ng2 and n1-n2 may be set, which respectively indicate the number of CSI-RS ports (>32) and (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.

[0313] (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) may be configured. FIG. 23 shows a second example of the configuration according to option 3 of embodiment C1. At least one row in 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.

[0314] 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. 24A, 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.

[0315] <<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.

[0316] According to this embodiment, the UE can be properly configured with a base station antenna layout for CSI-RS that uses more than 32 ports.

[0317] <Embodiment C2> This embodiment relates to the above-mentioned study 2.

[0318] With a CSI-RS that uses more than 32 ports, at least one of the following CSI / codebooks may be supported or configured: - Rel. 15 Type 1 CSI (Type 1 single panel codebook) - Rel. 15 Type 1 multi-panel CSI (Type 1 multi-panel codebook) - Rel. 15 Type 2 CSI (Type 2 codebook) - Rel. 15 Type 2 PS CSI (Type 2 port selective codebook) - Rel. 16 Type 2 CSI (Extended Type 2 codebook) - Rel. 16 Type 2 PS CSI (Extended Type 2 port selective codebook) - Rel. 17 Type 2 PS CSI (Additional Extended Type 2 port selective codebook)

[0319] A CSI-RS using more than 32 ports may be supported only for one or more specific CSI codebooks. For example, the one or more specific CSI codebooks may be at least one of a Type 1 single-panel codebook and a Type 1 multi-panel codebook. This can simplify specifications / UE operation.

[0320] The CSI supporting a CSI-RS using more than 32 ports may be an extension of the CSI for CJT (CJT codebook). The CSI for CJT may be at least one of the Rel. 18 CJT extended type 2 CSI (CJT extended type 2 codebook) and the Rel. 18 CJT supplemental extended type 2 PS CSI (CJT supplemental extended type 2 PS codebook). While the Rel. 18 CJT CSI assumes a separate SD basis for each TRP, the CSI for CJT extended for a CSI-RS using more than 32 ports may assume a common SD basis across multiple TRPs, similar to the aforementioned CJT CSI mode 2. The CSI for a CSI-RS using more than 32 ports may be an extension of the CSI for CJT mode 2. Either mode 1 of CSI for CJT or mode 2 of CSI for CJT for CSI-RS using more than 32 ports may be set or switched by a higher layer parameter.

[0321] The set values ​​of (N1, N2) and (O1, O2) may depend on the type of codebook / CSI or may differ depending on the type of codebook / CSI. For example, in a type 1 multi-panel codebook, the setting of option 2 / 3 in embodiment C1 may be applied. For example, in a type 1 single-panel codebook, the setting of option 1 / 2 / 3 in embodiment C1 may be applied.

[0322] According to this embodiment, the UE can use the appropriate codebook / CSI for CSI-RS with more than 32 ports.

[0323] <Supplementary Information> [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), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0324] 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.

[0325] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0326] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0327] [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), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0328] 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.

[0329] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0330] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0331] [Application of Each Embodiment] At least one of the above-described embodiments may be applied when a specific condition is met. The specific condition may be defined in a standard or may be notified to a UE / BS using higher layer signaling / physical layer signaling.

[0332] At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.

[0333] The specific UE capability may indicate at least one of the following: The UE supports specific processing / operation / control / information for at least one of the above embodiments. The UE supports 48, 64, 72, 96, or 128 ports for CSI measurement. The UE supports at least one setting of (N1, N2) and (O1, O2) for more than 32 ports (48, 64, 72, 96, or 128 ports). The UE supports at least one setting of (N1, N2) and (O1, O2) for a certain codebook / CSI type. The UE supports at least one setting of ng-n1-n2 and (O1, O2) for more than 32 ports (48, 64, 72, 96, or 128 ports). The UE supports at least one configuration of ng-n1-n2 and (O1,O2) for a certain codebook / CSI type. The UE supports at least one configuration of ng1-ng2-n1-n2 and (O1,O2) for more than 32 ports (48, 64, 72, 96, or 128 ports). The UE supports at least one configuration of ng1-ng2-n1-n2 and (O1,O2) for a certain codebook / CSI type. The UE supports rank-specific (O1,O2) or rank-common (O1,O2).

[0334] 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).

[0335] 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)).

[0336] Furthermore, at least one of the above-described embodiments may be applied when specific information related to the above-described embodiments (or performing the operations of the above-described embodiments) is configured / activated / triggered in the UE by higher layer signaling / physical layer signaling. For example, the specific information may be information indicating that the operations of the above-described embodiments are enabled, any RRC parameters for a specific release (e.g., Rel. 18 / 19), etc.

[0337] If the UE does not support at least one of the specific UE capabilities or is not configured with the specific information, the UE may apply, for example, Rel. 15 / 16 behavior.

[0338] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal including: a receiver that receives a channel state information (CSI)-reference signal (RS) configuration using more than 32 ports; and a controller that measures the CSI based on the configuration, wherein the configuration indicates at least one of a combination of the number of horizontal antenna elements and the number of vertical antenna elements, a number of panels, a combination of the number of panels, the number of horizontal antenna elements, and the number of vertical antenna elements, a number of horizontal panels and the number of vertical panels, and a combination of the number of horizontal antenna elements and the number of vertical antenna elements. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the configuration indicates either a combination of the number of horizontal oversamples and the number of vertical oversamples that is common to all ranks, or a combination of the number of horizontal oversamples and the number of vertical oversamples that depends on the rank. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the controller supports a part of multiple codebook types for CSI-RS using 32 or fewer ports. [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the configuration indicates a codebook type based on a codebook for coherent joint transmission.

[0339] (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.

[0340] 25 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0341] 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.

[0342] 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.

[0343] 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))).

[0344] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0345] 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).

[0346] 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.

[0347] 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.

[0348] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between 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.

[0349] 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.

[0350] 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.

[0351] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0352] 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).

[0353] 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.

[0354] 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.

[0355] 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.

[0356] 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).

[0357] 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.

[0358] 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.

[0359] 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.

[0360] 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.

[0361] 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.

[0362] 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.

[0363] 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.

[0364] 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.

[0365] 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).

[0366] 26 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0367] 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.

[0368] 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.

[0369] 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.

[0370] 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.

[0371] 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.

[0372] 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.

[0373] 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.

[0374] 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.

[0375] 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.

[0376] 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.

[0377] 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.

[0378] 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.

[0379] 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.

[0380] 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.

[0381] 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.

[0382] 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.

[0383] In addition, the transceiver unit 120 may transmit a channel state information (CSI)-reference signal (RS) configuration using more than 32 ports. The control unit 110 may control reception of CSI reports based on the configuration. The configuration may indicate at least one of a combination of the number of horizontal antenna elements and the number of vertical antenna elements, the number of panels, a combination of the number of panels, the number of horizontal antenna elements, and the number of vertical antenna elements, and a combination of the number of horizontal panels and the number of vertical panels, and the number of horizontal antenna elements and the number of vertical antenna elements.

[0384] (User Terminal) Fig. 27 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0385] 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.

[0386] 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.

[0387] 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.

[0388] 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.

[0389] 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.

[0390] 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.

[0391] 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.

[0392] 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.

[0393] 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.

[0394] 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.

[0395] 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.

[0396] 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.

[0397] 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.

[0398] 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.

[0399] 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.

[0400] 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.

[0401] Note that 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.

[0402] The transceiver 220 may receive a channel state information (CSI)-reference signal (RS) configuration using more than 32 ports. The controller 210 may measure the CSI based on the configuration. The configuration may indicate at least one of a combination of the number of horizontal antenna elements and the number of vertical antenna elements, the number of panels, a combination of the number of panels, the number of horizontal antenna elements, and the number of vertical antenna elements, the number of horizontal panels, the number of vertical panels, and a combination of the number of horizontal antenna elements and the number of vertical antenna elements.

[0403] The setting may indicate either a combination of horizontal and vertical oversampling numbers that is common to all ranks, or a combination of horizontal and vertical oversampling numbers that depends on the rank.

[0404] The controller 210 may support a subset of multiple codebook types for CSI-RS using 32 or fewer ports.

[0405] The configuration may indicate a codebook type based on the codebook for coherent joint transmission.

[0406] (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.

[0407] 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.

[0408] 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 28 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0409] 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.

[0410] 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.

[0411] 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.

[0412] 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.

[0413] 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.

[0414] 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.

[0415] 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.

[0416] 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.

[0417] 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).

[0418] 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.

[0419] 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.

[0420] (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.

[0421] 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.

[0422] 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.

[0423] 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.

[0424] 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.

[0425] 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.

[0426] 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.

[0427] 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.

[0428] 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.

[0429] 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.

[0430] 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.

[0431] 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.

[0432] 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.

[0433] 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.

[0434] 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.

[0435] 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.

[0436] 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.

[0437] 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.

[0438] 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."

[0439] 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.

[0440] 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.

[0441] 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.

[0442] 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.

[0443] 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.

[0444] 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.

[0445] 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.

[0446] 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).

[0447] 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).

[0448] 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).

[0449] 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.

[0450] 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.

[0451] 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).

[0452] 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.

[0453] 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.

[0454] 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.

[0455] 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.

[0456] 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.

[0457] 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.

[0458] 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.

[0459] 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.

[0460] 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.

[0461] 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.

[0462] 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.

[0463] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0464] 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.

[0465] 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.

[0466] 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.

[0467] 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.

[0468] 29 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.

[0469] 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.

[0470] 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).

[0471] 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.

[0472] 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.

[0473] 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.

[0474] 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.

[0475] 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.

[0476] 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).

[0477] 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.

[0478] 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)).

[0479] 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.

[0480] 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.

[0481] 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.

[0482] 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.

[0483] 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.

[0484] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0485] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0486] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0487] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0488] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0489] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0490] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0491] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ...." "does not expect ..." may be interchangeably read as "be not expected ...." Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (e.g., if apparatus A is a UE, apparatus B may be a base station).

[0492] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0493] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0494] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0495] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0496] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0497] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0498] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0499] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0500] In the present disclosure, terms such as "when A, B," "if A, (then) B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at (the same time as) / on A," "B after A," "B since A," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0501] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0502] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A receiving unit that receives channel status information (CSI) - reference signal (RS) settings using more than 32 ports, The system includes a control unit that measures CSI based on the above settings, The above setting represents at least one of the combinations of the number of antenna elements in two dimensions and the combination of the number of panels and the number of antenna elements in two dimensions. The aforementioned combination of two-dimensional antenna element numbers corresponds to a terminal with a two-dimensional oversample number combination common to all ranks.

2. The terminal according to claim 1, wherein the control unit supports a first type single-panel codebook, a first type multi-panel codebook, and an extended second type codebook for a CSI-RS using more than 32 ports.

3. The steps include receiving the channel status information (CSI) - reference signal (RS) settings using more than 32 ports, The process includes the step of measuring the CSI based on the above setting, The above setting represents at least one of the combinations of the number of antenna elements in two dimensions and the combination of the number of panels and the number of antenna elements in two dimensions. A wireless communication method for a terminal, wherein the combination of the number of two-dimensional antenna elements corresponds to a combination of two-dimensional oversample numbers common to all ranks.

4. A transmitting unit that transmits channel status information (CSI) - reference signal (RS) settings using more than 32 ports, The system includes a control unit that controls the reception of CSI reports based on the aforementioned settings, The above setting represents at least one of the combinations of the number of antenna elements in two dimensions and the combination of the number of panels and the number of antenna elements in two dimensions. The aforementioned combination of two-dimensional antenna element numbers corresponds to a base station with a two-dimensional combination of oversample numbers common to all ranks.

5. A system having a terminal and a base station, The terminal includes a receiving unit that receives channel status information (CSI) - reference signal (RS) settings using more than 32 ports, The system includes a control unit that measures CSI based on the above settings, The base station includes a transmitting unit that transmits the settings, The system includes a control unit that controls the reception of CSI reports based on the aforementioned settings, The above setting represents at least one of the combinations of the number of antenna elements in two dimensions and the combination of the number of panels and the number of antenna elements in two dimensions. The aforementioned combination of two-dimensional antenna element numbers corresponds to a system where the combination of two-dimensional oversample numbers is common to all ranks.