Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure is characterized by comprising a reception unit that receives a configuration for a plurality of Channel State Information (CSI)-Reference Signal (RS) resources each including more than two ports, and a control unit that controls, on the basis of the configuration, a report of at least one of Reference Signal Received Power (RSRP) and Signal to Interference plus Noise Ratio (SINR) corresponding to at least one of the more than two ports. According to the one aspect of the present disclosure, beam reporting can be appropriately performed.

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., 6G), it is being considered to use bands higher than 6 GHz (Upper-6 GHz), such as 6.4-7.1 GHz, and even higher bands (e.g., FR3) for communication. In these bands, it is being considered to apply beamforming to transmitted signals.

[0006] In addition, in future wireless communication systems (e.g., 6G), it is being considered to apply beamforming to transmitted signals using type 2 port selection (PS) CSI using beam management procedures.

[0007] However, the beam reporting in Type 2 PS CSI using the beam management procedure is not sufficiently considered. If such beam reporting is not sufficiently considered, there is a risk that communication quality / throughput will deteriorate.

[0008] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately perform beam reporting.

[0009] A terminal according to one aspect of the present disclosure is characterized by having a receiving unit that receives configurations for multiple Channel State Information (CSI)-Reference Signal (RS) resources, each having more than two ports, and a control unit that controls reporting of at least one of Reference Signal Received Power (RSRP) and Signal to Interference plus Noise Ratio (SINR) corresponding to at least one of the more than two ports based on the configurations.

[0010] According to one aspect of the present disclosure, beam reporting can be performed appropriately.

[0011] FIG. 1 is a diagram illustrating an example of CSI-RS positions within a slot. FIG. 2 is a diagram illustrating an example of SRS-based Type 2 PS CSI. FIG. 3 is a diagram illustrating an example of Type 2 PS CSI using a beam management procedure. FIG. 4 is a diagram illustrating an example of a correspondence relationship between CSI-RS ports and beams. FIGS. 5A and 5B are diagrams illustrating an example of a correspondence relationship between CSI-RS ports and beams. FIG. 6 is a diagram illustrating an example of ports reported in group-based reporting. FIG. 7 is a diagram illustrating an example of a QCL relationship of multi-port CSI-RS resources. FIG. 8 is a diagram illustrating an example of a QCL relationship of multi-port CSI-RS resources. FIG. 9 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 10 is a diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 11 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. FIG. 12 is a diagram illustrating an example of a hardware configuration of a base station and a user terminal according to an embodiment. FIG. 13 is a diagram illustrating an example of a vehicle according to an embodiment.

[0012] (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).

[0013] 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.

[0014] 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.

[0015] 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 a Doppler shift, a Doppler spread, an average delay, a delay spread, and a spatial parameter (e.g., a spatial Rx parameter) is the same between these different signals / channels (i.e., the signals / channels have a QCL with respect to at least one of these).

[0016] 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).

[0017] A plurality of types (QCL types) of QCL 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. The parameters (which may be referred to as QCL parameters) are as follows: QCL type A (QCL-A): Doppler shift, Doppler spread, mean delay, and delay spread QCL type B (QCL-B): Doppler shift and Doppler spread QCL type C (QCL-C): Doppler shift and mean delay QCL type D (QCL-D): Spatial reception parameters.

[0018] The QCL information as shown in the above QCL types A to D may be called a QCL property.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0023] 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)).

[0024] 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).

[0025] 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.

[0026] 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.

[0027] (CSI Report or Reporting) In Rel. 15 NR, a terminal (user terminal, User Equipment (UE)) 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 using, for example, an uplink control channel (e.g., a Physical Uplink Control Channel (PUCCH)) or an uplink shared channel (e.g., a Physical Uplink Shared Channel (PUSCH)).

[0028] 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.

[0029] 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).

[0030] The CSI may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a SS / PBCH Block Resource Indicator (SSBRI, SSB index), a Layer Indicator (LI), a Rank Indicator (RI), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), L1-SNR (Signal to Noise Ratio), and the like.

[0031] The UE may receive information about CSI reporting (report configuration information) and control CSI reporting based on the report configuration information. The report configuration information may be, for example, a "CSI-ReportConfig" information element (IE) of Radio Resource Control (RRC).

[0032] The reporting configuration information (e.g., "CSI-ReportConfig" of the RRC IE) may include, for example, at least one of the following: ◆ Information on the type of CSI report (report type information, e.g., "reportConfigType" of the RRC IE) ◆ Information on one or more quantities of CSI to be reported (one or more CSI parameters) (report quantity information, e.g., "reportQuantity" of the RRC IE) ◆ Information on the RS resources used to generate the quantities (the CSI parameters) (resource information, e.g., "CSI-ResourceConfigId" of the RRC IE) ◆ Information on the frequency domain to be used for CSI reporting (frequency domain information, e.g., "reportFreqConfiguration" of the RRC IE)

[0033] 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.

[0034] 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.).

[0035] 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).

[0036] 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.

[0037] 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).

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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).

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In Rel. 15 NR, UCI may contain one CSI part for wideband PMI feedback. CSI report #n contains PMI wideband information if reported.

[0047] 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.

[0048] 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).

[0049] 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.

[0050] In the present disclosure, CSI-RS, periodic CSI-RS (P-CSI-RS), semi-persistent CSI-RS (SP-CSI-RS), and aperiodic CSI-RS (AP-CSI-RS, A-CSI-RS) may be interchangeable. In the present disclosure, CSI-RS, periodic CSI reporting (P-CSI reporting), semi-persistent CSI reporting (SP-CSI reporting), and aperiodic CSI reporting (AP-CSI reporting, A-CSI reporting) may be interchangeable.

[0051] (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.

[0052] 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).

[0053] 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.

[0054] (CSI Reporting Configuration) The CSI reporting configuration (CSI-ReportConfig) of Rel. 16 includes a channel measurement resource (CMR), an interference measurement resource (IMR), etc. in addition to a codebook configuration (CodebookConfig). The IMR may be at least one of a zero power-interference measurement resource (ZP-IMR) and a non-zero power-interference measurement resource (NZP-IMR). Of the parameters of CSI-ReportConfig, parameters excluding codebookConfig-r16 are also included in the CSI reporting configuration of Rel. 15.

[0055] In the present disclosure, CMR, NZP CSI-RS resources, and resourcesForChannelMeasurement may be interchangeable. In the present disclosure, ZP-IMR, CSI-IM resources, and csi-IM-ResourcesForInterference may be interchangeable. In the present disclosure, NZP-IMR, NZP CSI-RS resources for interference measurement, and nzp-CSI-RS-ResourcesForInterference may be interchangeable.

[0056] 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.

[0057] 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.

[0058] <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.

[0059] <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.

[0060] 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.

[0061] However, in the CSI reporting configuration for multi-TRP in Rel. 17 with CSI reporting settings, if the above-mentioned options 1 and 2 are applied, the following measurement configurations may be made: ◆ Option 1 (X = 0): Measurement of NCJT CSI only. ◆ Option 1 (X = 1): Measurement of NCJT CSI and CSI of a single TRP (one TRP). ◆ Option 1 (X = 2): Measurement of NCJT CSI and CSI of a single TRP (two TRPs). ◆ Option 2: Measurement of both NCJT CSI and CSI of a single TRP.

[0062] 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.

[0063] (PMI / Type 1 Codebook) Type 1 (type I) codebook (Rel. 15) specifies a type 1 single panel codebook and a type 1 multi-panel codebook for base station panels. In the type 1 single panel, the antenna model (antenna setting) of the CSI antenna port array (logical setting) is specified for (N1, N2). The number of CSI-RS antenna ports P CSI-RS In Type 1 multi-panel, the number of CSI-RS antenna ports P CSI-RS and (N g , N1, N2), an antenna model of the CSI antenna port array (logical configuration) is specified.

[0064] In the present disclosure, the first dimension, the N1 dimension, one of the horizontal domain and the vertical domain, and the horizontal domain may be interchanged. In the present disclosure, the second dimension, the dimension perpendicular to the first dimension, the N2 dimension, the other of the horizontal domain and the vertical domain, and the vertical domain may be interchanged. In the present disclosure, N1 and N2 may be interchanged, and the horizontal domain and the vertical domain may be interchanged.

[0065] In the present disclosure, an N1-by-N2 DFT vector, a spatial domain (SD) vector, a 2D-DFT vector, an SD DFT vector, an SD basis vector, an SD beam, an SD basis, a precoder, a beam, and a vector may be interpreted interchangeably.

[0066] In the present disclosure, the terms port, antenna port, CSI-RS port, port index, and port number may be interchangeable.

[0067] In the present disclosure, (N1, N2), the two-dimensional number of antenna ports, the antenna configuration, and the base station antenna layout may be interchangeable. g, the number of panels, the number of antenna groups, and the number of antenna port groups may be read as interchangeable. In the present disclosure, N1, the number of antennas in the first dimension, and the number of antenna ports in the first dimension may be read as interchangeable. In the present disclosure, N2, the number of antennas in the second dimension, and the number of antenna ports in the second dimension may be read as interchangeable. In the present disclosure, O1, the number of oversamplings in the first dimension may be read as interchangeable. In the present disclosure, O2, the number of oversamplings in the second dimension may be read as interchangeable. In the present disclosure, N1O1, the number of beams in the first dimension, and the number of vectors in the first dimension may be read as interchangeable. In the present disclosure, N2O2, the number of beams in the second dimension, and the number of vectors in the second dimension may be read as interchangeable.

[0068] In the present disclosure, two polarizations, a first polarization and a second polarization, and a horizontal polarization and a vertical polarization may be interchangeable. In the present disclosure, one polarization, one of a first polarization and a second polarization, and one of a horizontal polarization and a vertical polarization may be interchangeable. In the present disclosure, co-phasing, phase difference, phase compensation between polarizations, and φ may be interchangeable.

[0069] In the present disclosure, the terms Type 1 codebook, Type 1 single-panel codebook, and Type 1 multi-panel codebook may be interpreted interchangeably.

[0070] (Type 1 Single Panel (SP) 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 ,i1,2 ,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 ].

[0071] 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.

[0072] The precoding matrix for v=1 is W l,m,n (v) The precoding matrix for v=2 is W l,l',m,m',n (v) It is expressed as P CSI-RS The precoding matrix for <16 and v=3,4 is W l,l',m,m',n (v) It is expressed as P CSI-RS The precoding matrix for ≥ 16 and v = 3, 4 is W l,m,p,n (v) The precoding matrix for v=5,6 is W l,l',l'',m,m',m'',n (v) The precoding matrix for v=7,8 is Wl,l',l'',l''',m,m',m'',m''',n (v) l,l',l'',l''' are expressed as 1,1 and k1. m, m', m'', and m''' are determined by i 1,2 and k2. n is determined by i2. p is determined by P CSI-RSOf the (≧16) ports, the first half of the ports are 0 and the second half of the ports are 1.

[0073] The precoding matrix W can be expressed as the product of two matrices, W1W2, where W1 represents the wideband and long-term channel properties and the codebook index i1 (e.g., i 1,1 and i 1,2 ) is expressed by i 1,1 and i 1,2 and denote the beam selection in two dimensions, respectively. W2 denotes frequency selectivity (subband) and short-term channel characteristics and is represented by codebook index i2. i2 may denote the phase adjustment between the two polarizations. W1 may be given by the following equation E1 using matrix B:

[0074] B shows L 2D DFT beams, each oversampled by (O1, O2).

[0075] If the rank is {1, 5, 6, 7, 8}, the codebook index for each PMI is i 1,1 , i 1,2 , i2. If the rank is {2, 3, 4}, the codebook index for each PMI is i 1,1 , i 1,2 , i 1,3 , i2. i 1,3 is mapped to k1 and k2 according to a table in the specification. For rank=2, 3, 4, the beams selected for different layers may be different when generating PMI.

[0076] The codebook for 1-layer CSI reporting and codebookMode=1 is index i corresponding to the horizontal component of the beam. 1,1 = l=0,1,...,N1O1-1 and the index i corresponding to the vertical component of the beam 1,2= m = 0, 1, ..., N2O2-1 and indices i2 = n = 0, 1, 2, 3 corresponding to the subbands. Antenna ports 3000 to 2999+P CSI-RS Precoding matrix W for one-layer CSI reporting with l,m,n (1) is given by the following equation E2:

[0077] φ for the precoding matrix n , θ p , u m , v l,m , v ~ l,m is given by the following equation E3:

[0078] where [i 1,1 ,i 1,2 ,i2]=[l,m,n]. l,m is an N1-by-N2 DFT vector (SD basis vector, SD beam), expressed as exp(j2πln1 / O1N1) × exp(j2πmn2 / O2N2), n1 = 0, 1, ..., N1-1, n2 = 0, 1, ..., N2-1, and specified by v and l. l,m indicates one beam. The phase adjustment φ between the two polarizations n θ = exp(jπn / 2), which indicates the difference in phase of the second polarization relative to the phase of the first polarization. p indicates the phase of the second half port relative to the phase of the first half port.

[0079] (Type 1 Multi-Panel (MP) Codebook) For Rel. 15 Type 1 multi-panel CSI, the UE sets the codebook type upper layer parameter (subType in type1 in codebookType in CodebookConfig) to Type 1 multi-panel ('typeI-MultiPanel'). For Rel. 15 Type 1 multi-panel CSI, compared to Type 1 single-panel codebook, the number of panels N in addition to N1 and N2 is increased. gCompared with the Type 1 single-panel codebook, the (wideband) inter-panel co-phasing (phase compensation between panels) is set as i 1,4 The same SD beam (DFT vector v l,m , SD basis indices l,m) are selected and only the inter-panel phase differences are added and reported.

[0080] 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.

[0081] The antenna configuration parameters for the Type 1 multi-panel codebook are ng-n1-n2 (N g , N1, N2). In the existing specifications, ranks up to 4 are supported, and ranks 5 and above are not supported.

[0082] Each PMI value corresponds to a codebook index i1, i2. v is the RI value (number of layers). For v=1, i1=[i 1,1 i 1,2 i 1,4 ]. For v∈{2,3,4}, i1=[i 1,1 i 1,2 i 1,3 i 1,4 ].

[0083] When the codebook mode is set to 1, Ng = 2, i 1,4 =i 1,4,1 N g = 4, i 1,4 =[i 1,4,1 i 1,4,2 i 1,4,3 ]. When the codebook mode is set to 2, i 1,4 =[i 1,4,1 i 1,4,2 ]. i 1,4 is the number of panels N g and codebook mode. N g Codebook mode 2 is supported only for [i 1,4,1 i 1,4,2 ] correspond to two polarizations, respectively. Each of the two values ​​represents the wideband phase difference of the second panel (Panel 1) relative to the first panel (Panel 0) in the corresponding polarization. N g = 2 and i in codebook mode 1 1,4 Only one value is reported, which represents the wideband retardation of the second panel (Panel 1) relative to the first panel (Panel 0).

[0084] When the codebook mode is set to 2, i2 = [i 2,0 i 2,1 i 2,2 ]. The number and value of i2 are related to the codebook mode and may be different from the Type 1 single panel codebook. If subband reporting is configured, i2 is the index for the subband. If wideband reporting is configured, i2 is the index for the wideband. In codebook mode 1, the number and value of i2 are the same as in the Type 1 single panel codebook, and i2 has one value for each subband. In codebook mode 2 (N g =2), the phase difference between the subbands has three values, representing the phase difference between the polarizations and between the panels.

[0085] Codebook mode 2 has a larger feedback overhead because it reports more phase differences for more accurate CSI. g Only supported for =2.

[0086] The Type-1 multi-panel codebook is based on the Type-1 single-panel codebook. In the Type-1 multi-panel codebook, the codebook for the first panel (Panel 0) follows the Type-1 single-panel codebook. The codebooks for the other panels apply the same precoder, with additional phase differences between the panels.

[0087] φ for the precoding matrix n , a p , b p , u m , v l,m is given by the following equation E4:

[0088] Antenna ports 3000 to 2999+P CSI-RS The precoding matrix for v-layer CSI reporting using (v) The number of panels in the i-th layer is N. g , the precoding matrix for codebook mode X is W l,m,p,n i,N_g,X It is expressed by [i 1,1 ,i 1,2 ,i 1,4 ,i2]=[l,m,p,n].

[0089] Codebook modes 1 and N g = {2, 4}, the precoding matrix W for 1-layer CSI reporting l,m,p,n (1) is W l,m,p,n 1,N_g,1 The codebook modes 1 and N are represented by g = {2,4}, the precoding matrix W for 2-layer CSI reporting l,l',m,m',p,n (2) is (1 / sqrt(2))[W l,m,p,n (1,N_g,1) W l',m',p,n(2,N_g,1) ] where N g =W for {2,4} l,m,p,n 1,N_g,1 and W l,m,p,n 2,N_g,1 (N g W for =2 l,m,p,n 1,2,1 and W l,m,p,n 2,2,1 And, N g W for =4 l,m,p,n 1,4,1 and W l,m,p,n 2,4,1 and ) are given by the following equation E5:

[0090] where φ n =e jπn / 2 N g =2, p=p1, and N g For φ = 4, p = [p1, p2, p3]. p_1 , φ p_2 , φ p_3 represents the inter-panel phase difference (inter-panel phase compensation). In each precoding matrix, the first and second rows correspond to the first panel (panel 0), the third and fourth rows correspond to the second panel (panel 1), the fifth and sixth rows correspond to the third panel (panel 2), and the seventh and eighth rows correspond to the fourth panel (panel 3). Since the same SD beam is selected for all panels, each row has the same v l,m φ p_1 represents the phase difference of the second panel relative to the first panel. p_2 represents the phase difference of the third panel relative to the first panel. p_3 represents the phase difference of the fourth panel relative to the first panel.

[0091] Codebook modes 2 and N g = 2, the precoding matrix W for 1-layer CSI reporting l,m,p,n (1) is W l,m,p,n 1,2,1 The codebook modes 2 and N g = 2, the precoding matrix W for two-layer CSI reporting l,l',m,m',p,n(2) is (1 / sqrt(2))[W l,m,p,n 1,2,2 W l',m',p,n 2,2,2 ] where W l,m,p,n 1,2,2 and W l,m,p,n 2,2,2 is given by the following equation E6:

[0092] In each precoding matrix, the first and second rows correspond to the first panel (panel 0), and the third and fourth rows correspond to the second panel (panel 1). Since the same SD beam is selected for all panels, each row has the same v l,m p = [p1 p1] and n = [n0, n1, n2]. p_1 represents the phase difference of the second panel (panel 1) relative to the first panel (panel 0) in the first polarization. p_2 represents the phase difference of the second panel (panel 1) relative to the first panel (panel 0) in the second polarization. n_0 represents the phase difference of the second polarization of the first panel relative to the first polarization of the first panel for each subband. n_1 represents the phase difference of the first polarization of the second panel relative to the first polarization of the first panel for each subband. n_2 represents the phase difference of the second polarization of the second panel relative to the first polarization of the first panel for each subband.

[0093] (PMI / Type 2 Codebook) In the present disclosure, the terms Type 2 (type II) codebook, extended Type 2 codebook, Type 2 port selection (PS) codebook, extended Type 2 PS codebook, additional extended Type 2 port PS codebook, codebook for CJT, and codebook for Doppler may be interpreted interchangeably.

[0094] (Type II Codebook) For a type II codebook (Rel. 15, type II CSI), the UE is configured with the upper layer parameter codebookType set to 'type II'.

[0095] In this disclosure, a matrix Z with X rows and Y columns may be expressed as Z(X×Y).

[0096] In Rel. 15 Type 2 CSI, for a given layer l, the subband-wise (SB-wise) precoding matrix is ​​based on the following equation F1: l (N t ×N3) = W1W 2,l (F1)

[0097] N t is the number of antennas / antenna ports. N3 is the total number of precoding (beamforming) matrices (precoders) indicated by the PMI (number of subbands).

[0098] W1(N t ×2L) are 2L DFT vectors (oversampled DFT vectors) and indicate the selected spatial domain basis. L∈{2,4} is the number of beams per layer. The actual number of beams considering two polarizations at one location is 2L. For example, the DFT vectors of L=2 SD beams are respectively b i ,b j It may also be expressed as:

[0099] 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,lAlso, Type 2 CSI in Rel. 15 only supports ranks 1 and 2.

[0100] 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.

[0101] The value of L is set using the upper layer parameter numberOfBeams.

[0102] The L vectors combined by the codebook are 1,1 and i 1,2 Identified by i 1,1 =[q1 q2] q1∈{0,1,...,O1-1} q2∈{0,1,...,O2-1} i 1,2 ∈{0,1,..., N_1*N_2 C L -1} n1=[n1 (0) ,...,n1 (L-1) ] n2=[n2 (0) ,...,n2 (L-1) ] n1 (i) ∈{0,1,...,N1-1} n2 (i) ∈{0,1,...,N2-1} C(x,y) is x C y , 0 for x<y.

[0103] ((Enhanced Type 2 Codebook (Rel. 16))) For Rel. 16 Type 2 CSI (enhanced Type 2 codebook), the UE is configured with the upper layer parameter codebookType set to 'typeII-r16'.

[0104] 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.

[0105] In Rel. 16 Type 2 CSI, the precoding matrix W for a given layer l is l is expressed by the following formula F2: l = W1W ~ l W f,l H (F2)

[0106] 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

[0107] For CSI reporting, the UE may be configured with one of two subband sizes: N PRB SB The 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.

[0108] 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.

[0109] 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.

[0110] 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 for which CSI is reported. M v If N3 > 19, there are M FD DFT vectors from the intermediate subset (InS) of size N3' (<N3). v FD DFT vectors (FD basis) are selected. If N3≦19, log2(C(N3−1,M v -1)) bits are reported, where C(N3-1,M v -1) is N3-1 to M v -Represents the number of combinations in which one can be selected (combinatorial coefficient), and is also called the binomial coefficient.

[0111] 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).

[0112] The PMI subband size is given by CQI subband size / R, where R∈{1, 2}. In other words, R is the ratio of the CQI subband size to the PMI subband size. The number of FD DFT vectors for a given rank v is M. v is ceil(p v ×N3 / R) The number of FD DFT vectors M v is the same for all layers l∈{1,2,3,4}. v is set by higher layers.

[0113] The multiple precoding matrix indicated by the PMI is L+M v is determined from vectors.

[0114] 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

[0115] M v The FD DFT vectors are initial ∈{-2M v +1,-2M v +2,...,0}, n 3,l =[n 3,l (0) ,...,n 3,l (M_v-1) ], n 3,l (f) ∈{0,1,...,N3-1}.

[0116] In the FD DFT vector, the elements (FD basis) for the FD basis (subband) index t=0,1,...,N3-1 and layer l=1,...,v are y t,l (f) =exp(j2πtn 3,l (f) / N3). M of FD DFT vector v indices f=0,1,...,M v M to -1 v The FD DFT vectors are0,l (f) ,y 1,l (f) ,...,y N_3-1,l (f) ] T is.

[0117] 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

[0118] 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.

[0119] In the extended type 2 codebook, L, β, p v The combination of values ​​(parameter combination) is determined by the upper layer parameter paramCombination-r16 (parameter combination setting). L is the number of SD beams. v is the number of FD basis vectors for rank v, M v =ceil(p v × N3 / R). β is a parameter for calculating the maximum number of NZCs.

[0120] In the present disclosure, the terms codebook parameter combination, codebook parameter combination, parameter combination, and parameter combination setting may be read interchangeably.

[0121] 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.

[0122] 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.

[0123] The multiple PMI indices (PMI values, codebook indices) associated with different CSI part 2 information are expressed by the following equation F21 for the l-th layer of rank v: i1 = [i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 ] (v=1) i1=[i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 i 1,6,2 i 1,7,2 i 1,8,2 ] (v=2) i1=[i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 i 1,6,2 i 1,7,2 i 1,8,2 i 1,6,3 i1,7,3 i 1,8,3 ] (v=3) i1=[i 1,1 i 1,2 i 1,5 i 1,6,1 i 1,7,1 i 1,8,1 i 1,6,2 i 1,7,2 i 1,8,2 i 1,6,3 i 1,7,3 i 1,8,3 i 1,6,4 i 1,7,4 i 1,8,4 ] (v=4) (F21)

[0124] Each index is defined as follows: ◆i 1,1 : Rotation factors [q1 q2] in two-dimensional oversampling. q1∈{0,1,...,O1-1}, q2∈{0,1,...,O2-1}. A beam index is selected within each (SD) beam group, i 1,1 Reported / displayed by i 1,2 : Multiple indices of the SD basis corresponding to each SD beam. i 1,2 ∈{0,1,...,C(N1N2,L)-1}. L beam groups are selected from N1N2 (SD) beam groups, and i 1,2 Reported / displayed by i 1,5 : Codebook indicator. The index of the FD basis for the selected DFT window. i 1,5 ∈{0,1,...,2M v -1}. ◆i 1,6,l : Codebook indicator. The FD basis selected for the l-th layer. If N3≦19, then i 1,6,l ∈{0,1,...,C(N3-1,M v -1)-1}. If N3>19, i 1,6,l ∈{0,1,...,C(2M v -1,M v -1)-1}. ◆i 1,7,l : Bitmap indicator for the lth layer. The non-zero bits in the bitmap are i2,4,l and i 2,5,l Identifies which coefficients in are reported. 1,7,l =[k l,0 (3) ...k l,M_v-1 (3) ], k l,f (3) =[k l,0,f (3) ...k l,M_v-1,f (3) ], k l,i,f (3) ∈{0,1}. ◆i 1,8,l : The strongest coefficient indicator for the lth layer (the largest element k in the amplitude coefficient indicator) l,i,f (2) ).i 1,8,l The strongest coefficients in layer l, identified by ∈{0,1,...,2L-1}, are i for v=1. 1,8,l =Σ i=0 i_1^* k l,i,0 (3) -1, and for 1 < v ≤ 4, i 1,8,l =i l * It is given as follows. ◆i 2,3,l : Amplitude coefficient indicator (for both polarizations) of the (wideband) coefficients of the lth layer. 2,3,l =[k l,0 (1) k l,1 (1) ]. ◆i 2,4,l : The amplitude coefficient indicator of the reported (subband) coefficient of the lth layer. 2,4,l =[k l,0 (2) ...k l,M_v-1 (2) ]. ◆i 2,5,l : Phase coefficient indicator of the reported (subband) coefficient of the lth layer. 2,5,l =[c l,0,f ...c l,M_v-1,f ].

[0125] f l * ∈{0,1,...,M v -1}, i 2,4,lLet 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.

[0126] 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 (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) pl,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}.

[0127] 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.

[0128] 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.

[0129] 3000 to 2999+P CSI-RS The precoding matrix W is represented by the codebook for v (=1 to 4) layer CSI reporting using (v) is the precoding matrix W for layer l (= 1 to v) l Based on the precoding matrix W l is expressed by the following formula F3.

[0130] 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.

[0131] For CSI Part 2 grouping, for a given CSI report, the PMI information is grouped into three groups (groups 0 to 2). This is important when CSI omission is performed. Index i 2,4,l , i 2,5,l , i 1,7,l Each reported element of is associated with a specific priority rule. Groups 0 to 2 follow the following: ◆ Group 0: Index i 1,1 , i 1,2 , i 1,8,l (l=1,...,v) ◆Group 1: Index i (if reported) 1,5 , index i (if reported) 1,6,l , i 1,7,l The highest (top) v2LM v -floor(K NZ / 2) priority elements, i 2,3,l , i 2,4,l The highest (upper) ceil(K NZ / 2)-v priority elements, i 2,5,l The highest (upper) ceil(K NZ / 2)-v priority elements (l=1,...,v) ◆Group 2: i 1,7,l The lowest (lowest) floor(K NZ / 2) priority elements, i 2,4,l The lowest (lowest) floor(K NZ / 2) priority elements, i 2,5,l The lowest (lowest) floor(K NZ / 2) priority elements (l=1,...,v)

[0132] 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.

[0133] (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'.

[0134] 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.

[0135] The value of d is set using the upper layer parameter portSelectionSamplingSize. d ∈ {1, 2, 3, 4} and d ≦ min(P CSI-RS / 2,L).

[0136] For each polarization, L antenna ports are 1,1 Selected by i 1,1 ∈{0,1,...,ceil(P CSI-RS / (2d))-1}.

[0137] ((Enhanced Type 2 Port Selection Codebook (Rel. 16))) For Rel. 16 Type 2 PS CSI (enhanced Type 2 PS codebook), the UE is configured with the upper layer parameter codebookType set to 'typeII-PortSelection-r16'.

[0138] 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.

[0139] For layer l∈{1,2,3,4}, the precoding matrix W for generating a subband-wise (subband (SB)-wise) precoder is l is expressed by the following formula F4: l (N t ×N3) = QW1W ~ l W f,l H (F4)

[0140] 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}.

[0141] 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.

[0142] The extended type 2 PS CSI increases the number of FD basis vectors from N3 to M in the same way as the type 2 CSI of Rel. 16. v By reducing it to (M v <<N3>>, which reduces overhead compared to Rel. 15 Type 2 PS CSI.

[0143] In the extended type 2 PS codebook, L, β, p v The combination of values ​​(parameter combination) is determined by the upper layer parameter paramCombination-r16 (parameter combination setting).

[0144] For the Rel. 17 Type 2 PS CSI / codebook (further enhanced Type 2 PS codebook), the UE configures the upper layer parameter codebookType set to 'typeII-PortSelection-r17'.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] In the supplemental enhanced type 2 PS codebook, the values ​​of α, M, and β (codebook parameter combination, parameter combination) are determined by the upper layer parameter paramCombination-r17 (codebook parameter setting). In the parameter combination α, M, and β for the supplemental enhanced type 2 PS codebook in Rel. 17, α is the number of selected CSI-RS ports in the PS codebook, K1 = αP CSI-RS is a parameter for 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.

[0149] L vectors v m^(i) (i=0,1,...,L-1) based on P CSI-RS K1 ports are selected from the vector v m^(i) is m=[m (0) ... [m (L-1) ], m (i) ∈{0,1,...,P CSI-RS / 2-1}. (i) is the index i 1,2 ∈{0,1,...,C(P CSI-RS / 2,L)-1}.

[0150] 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.

[0151] Precoding matrix W for a given layer l l is expressed by the following formula F5: l (K×N3) = W1W ~ l W f,l H (F5)

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] (JT) Joint transmission (JT) may refer to simultaneous data transmission from multiple points (eg, TRPs) to a single UE.

[0157] 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.

[0158] 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.

[0159] (NCJT CSI / Type 1 Codebook) In Rel. 17, the applicable scenario for NCJT CSI reporting is a single DCI-based MTRP NCJT with a Type 1 single-panel codebook. For NCJT CSI measurement, two channel measurement resource (CMR) groups, each with a CMR from one TRP, can be configured within a single CSI-ReportConfig. One CSI reporting mode can be configured from two modes:

[0160] 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).

[0161] 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.

[0162] 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.

[0163] The UE selects one or more CSIs to report based on the mode (CSI reporting mode) configured by csi-ReportMode. csi-ReportMode indicates one of the following two modes (NCJT CSI modes): Mode 1 and Mode 2. ◆ Mode 1 The UE may be configured to report X CSIs associated with single-TRP measurement hypotheses and one CSI associated with the NCJT measurement hypothesis. X = 0, 1, 2. If X = 2, two CSIs are associated with two different single-TRP measurement hypotheses with multiple CMRs from different CMR groups. Support for X = 1, 2 is an optional UE feature for UEs that support Option 1. ◆ Mode 2 The UE is configured to report one CSI associated with the best one of the NCJT and single-TRP measurement hypotheses.

[0164] 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.

[0165] 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).

[0166] 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.

[0167] (CJT CSI / Type-2 Codebook) In the ideal case (where four TRPs are co-located), a joint estimation of the aggregated channel matrix H can be performed, and a joint precoding matrix V can be fed back. However, the large-scale path losses of the four paths can vary significantly. A joint precoding matrix V based on a constant module codebook is not accurate. In this case, the feedback per TRP and inter-TRP coefficients can be matched by the current NR Type-2 codebook.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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).

[0173] For example, the precoding matrix for a 4-TRP CJT CSI (codebook) is W1 / W f / W l The W1 for each TRP may be the same or different, selected jointly or individually. l may be different and may be selected jointly or individually. fmay be the same or different, and may be jointly or individually selected.

[0174] There are two codebook mode settings for FD basis selection. In mode 1, we denote the FD basis offset for the j-th selected CSI-RS resource for j=2,...,N by i 1,9 In Mode 2, i 1,9 No reporting is required. All CSI-RS resources have the same FD basis selection.

[0175] ◆Mode 1 is SD / FD basis selection per TRP / TRP group. It allows independent FD basis selection across N TRPs / TRP groups. For example, its codebook structure is given by the following formula G1, where N is the number of TRPs or TRP groups.

[0176] ◆ Mode 2 is SD basis selection per TRP / TRP group (port group or resource) and joint / common FD basis selection (across N TRPs / TRP groups). For example, its codebook structure is given by the following formula G2, where N is the number of TRPs or TRP groups.

[0177] In these two modes, detailed designs such as parameter combination, basis selection, TRP (group) selection, reference amplitude, and W2 quantization method may be shared.

[0178] For an enhanced Type II codebook for CJT (Type 2 CSI for CJT in Rel. 18), the UE may configure the higher layer parameter codebookType set to 'typeII-CJT-r18'. For a further enhanced Type II port selection codebook for CJT (Type 2 PS CSI for CJT in Rel. 18), the UE may configure the higher layer parameter codebookType set to 'typeII-CJT-PortSelection-r18'.

[0179] The UE uses N TRP ∈{1,2,3,4} CSI-RS resources can be configured.

[0180] In the extended type 2 codebook for CJT, the upper layer parameter paramCombination-CJT-L-r18 determines {L1,...,L N_TRP} value of N L A set of ∈{1,2,4} combinations is set. N L The value of is set by the higher layer parameter numberOfSDCombinations.

[0181] In the CJT additional extended type 2 PS codebook, the upper layer parameter paramCombination-CJT-PS-alpha-r18 determines {α1,...,α N_TRP} value of N L A set of ∈{1,2,4} combinations is set. N L The value of is set by the higher layer parameter numberOfSDCombinations-PS.

[0182] The UE may configure the upper layer parameter restrictedCMR-Selection. If restrictedCMR-Selection is configured, the number of selected CSI-RS resources N is NTRP Otherwise, the UE TRP , we expect to select N CSI-RS resources, and the selection is TRP The value is reported using a bitmap of bits.

[0183] In selecting / reporting an SD beam, selection / reporting of an SD beam per CSI-RS resource is applied.

[0184] In the extended type 2 codebook for CJT, the precoding matrix indicated by PMI is Σ j=1 N L σ_j +M v vectors, where {σ1,...,σ N} is 1≦σ1<…<σ N ≦N TRP are the indices of the N CSI-RS resources selected in ascending order so that TRP may be the number of CSI-RS resources configured for CSI reporting, or may be the number of TRPs for CJT. σ_1 ,...,L σ_N} is {L1,...,L N_TRP} is the corresponding value from the selected combination.

[0185] j=1,...,N, i=0,1,...,L σ_j −1, L corresponding to the j-th selected CSI-RS resource σ_j The vectors vm_1,f^(i),m_2,f^(i) are 1,1 , i 1,2 It is displayed / reported by, where i 1,1 , i 1,2 is given by the following equation G3: 1,1 =[i 1,1,1 ...i 1,1,N ] i 1,1,j =[q 1,j q 2,j ] q 1,j ∈{0,1,...,O1-1} q 2,j ∈{0,1,...,O2-1} i 1,2 =[i 1,2,1...i 1,2,N ] i 1,2,j ∈{0,1,...,C(N1N2,L σ_j )-1} (G3)

[0186] In the additional extended type 2PS codebook for CJT, the precoding matrix indicated by PMI is Σ j=1 N L σ_j +M vectors, where {σ1,...,σ N} is 1≦σ1<…<σ N ≦N TRP are the indices of the N CSI-RS resources selected in ascending order so that L σ_j =K 1,σ_j / 2, K 1,σ_j =α σ_j *P CSI-RS {α σ_1 ,...,α σ_N} is {α1,...,α N_TRP} is the corresponding value from the selected combination.

[0187] j=1,...,N, i=0,1,...,L σ_j -1, L σ_j vectors v m_j^(i) Based on this, P of the j-th selected CSI-RS resource is CSI-RS From the ports, K 1,σ_j ports are selected and i 1,2 It is displayed / reported by, where i 1,2 is given by the following equation G4: 1,2 =[i 1,2,1 ...i 1,2,N ] i 1,2,j ∈{0,1,...,C(P CSI-RS ,L σ_j )-1} (G4)

[0188] In the present disclosure, the CJT codebook, the CJT type 2 codebook, the CJT extended type 2 codebook, the Rel. 18 CJT type 2 codebook, type II-CJT-r18, the CJT supplemented extended type 2 PS codebook, the Rel. 18 CJT type 2 PS codebook, and type II-CJT-PortSelection-r18′ may be read interchangeably.

[0189] (Doppler CSI / Type-2 Codebook) It is being considered to extend / improve CSI reporting for UEs moving at high / medium speeds by utilizing time-domain correlation / Doppler-domain (DD) information. For example, it is being considered to improve the extended (Rel. 16) Type-2 codebook and the additional extended (Rel. 17) Type-2 PS codebook without changing the spatial and frequency domain basis, and to report from the UE the time-domain channel characteristics (time-domain correlation profile) measured via the tracking CSI-RS (TRS).

[0190] 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.

[0191] TRS is supported to track Doppler shift. However, TRS has the following problems: ◆ The number of ports per CSI-RS resource set is limited to one. Each CSI-RS resource uses a single port. ◆ The configurable period is 10 ms or more. ◆ CSI reporting for TRS is not assumed. There is no reporting configuration for P-TRS. Reporting can be configured, but the report quantity (reportQuantity) can only be set to 'none'. A maximum of 16 CSI-RS resources can be used per CSI-RS resource set.

[0192] 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.

[0193] The CMR can be used to measure the effect of Doppler shift, but the RS used for the measurement depends on the UE implementation.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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:

[0198] 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.

[0199] A d-slot may be of duration in DD units.

[0200] When UE-side prediction is assumed, the UE is supported to predict the CSI / channel after slot l, and the position of slot l (from multiple candidate values) is configured by the base station via higher layer signaling. The multiple candidates for the slot l position are determined based on the existing CSI reference resource position (nNCSI,ref ) and (n+δ), where δ>0. The existing CSI reference resource in the existing operation, i.e., (nN CSI,ref ) is reused / repurposed to indicate the position of the last CSI-RS occasion used for CSI reporting.

[0201] For the parameter δ, an additional value of 2 is supported.

[0202] N4 is set by the base station via an upper layer parameter N4.

[0203] When N4=1, the DD basis may be the identity. There may be no DD compression. In this case, the codebook structure may be, for example, the following formula H1:

[0204] For N4>1, the Doppler domain orthogonal DFT basis may be commonly selected for all SD / FD basis sets. In this case, the codebook structure may be, for example, the following formula H2:

[0205] 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.

[0206] For an enhanced Type II codebook for predicted PMI (Rel. 18 Type 2 CSI for predicted PMI), the UE may configure the higher layer parameter codebookType set to 'typeII-Doppler-r18'. For a further enhanced Type II port selection codebook for predicted PMI (Rel. 18 Type 2 PS CSI for predicted PMI), the UE may configure the higher layer parameter codebookType set to 'typeII-Doppler-PortSelection-r18'.

[0207] In the present disclosure, the Doppler codebook, the Doppler type 2 codebook, the extended type 2 codebook for predicted PMI, the Rel. 18 type 2 CSI codebook for predicted PMI, type II-Doppler-r18, the additional extended type 2 PS codebook for predicted PMI, the Rel. 18 type 2 PS codebook for predicted PMI, and type II-Doppler-PortSelection-r18 may be interpreted as interchangeable.

[0208] (CSI-RS Port) In Rel. 15, for example, the CSI-RS is used as a DL RS for at least one of channel state information (CSI) acquisition, beam management (BM), beam failure recovery (BFR), and fine time and frequency tracking. The CSI-RS supports 1, 2, 4, 8, 12, 16, 24, and 32 ports (antenna ports, CSI-RS ports). The CSI-RS supports periodic, semi-persistent, and aperiodic transmission. The frequency density of the CSI-RS is configurable to adjust overhead and CSI estimation accuracy.

[0209] 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.

[0210] 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).

[0211] (Event-based beam reporting) It is being considered that future wireless communication systems will support event-based beam reporting. Event-based beam reporting may also be called event-triggered beam reporting, and may mean UE-initiated beam reporting.

[0212] Examples of events defined in existing 5G NR include the following. Note that the events are not limited to those shown below, and other new events may be defined. Event A1: A case in which the measurement result of the serving [cell] is better than a threshold. Event A2: A case in which the measurement result of the serving [cell] is worse than a threshold. Event A3: A case in which the measurement result of the neighboring [cell] (a value obtained by adding an offset to the measurement result) is better than the measurement result of the SpCell (a value obtained by adding an offset to the measurement result). Event A4: A case in which the measurement result of the neighboring [cell] (a value obtained by adding an offset to the measurement result) is better than a threshold. Event A5: A case in which the measurement result of the SpCell is worse than a first threshold, and the measurement result of the neighboring [cell] (a value obtained by adding an offset to the measurement result) is better than a second threshold. Event A6: A case where the measurement result of the neighboring [cell] (a value obtained by adding an offset to the measurement result) is better than the measurement result of the serving cell (Secondary Cell (SCell)) (a value obtained by adding an offset to the measurement result). Event B1: A case where the measurement result of the inter-RAT neighboring [cell] is better than a threshold. Event B2: A case where the measurement result of the PCell is worse than a first threshold, and the measurement result of the inter-RAT neighboring [cell] (a value obtained by adding an offset to the measurement result) is better than a second threshold.

[0213] (Analysis) In future wireless communication systems (e.g., 6G), it is being considered to use bands higher than 6 GHz (Upper-6 GHz), such as 6.4-7.1 GHz, and even higher bands (e.g., FR3) for communication. In these bands, it is being considered to apply beamforming to the transmitted signals.

[0214] As shown in Figure 2, in NR, there are cases where SRS is used for Type 2 PS CSI (SRS-based Type 2 PS CSI). That is, the base station may apply beamforming to the CSI-RS based on the reception result of the SRS transmitted by the UE. The UE may report CSI based on the reception result of the CSI-RS.

[0215] Here, in future wireless communication systems (e.g., 6G), instead of SRS-based Type 2 PS CSI, Type 2 PS CSI using a beam management procedure is being considered.

[0216] As shown in FIG. 3, in Type 2 PS CSI using beam management procedures, the base station may transmit multiple DL beams to the UE. The UE may measure the multiple beams and transmit the measurement results (beam reports) to the base station. The base station may apply beamforming to the CSI-RS based on the measurement results (beam reports). The UE may report CSI based on the reception results of the CSI-RS. Furthermore, the UE may update the beam through at least one of the beam report and the CSI report.

[0217] In the above-mentioned multiple DL beam transmission and beam reporting, a CSI-RS associated with (having) more than one CSI-RS port (multi-port CSI-RS) may be used.

[0218] Type-2PS CSI using the beam management procedure described above is considered to have the following advantages 1 to 4 over SRS-based Type-2PS CSI. -◆Advantage 1: The beam management procedure only needs to capture slow fading and can be performed much less frequently than the CSI procedure. -◆Advantage 2: While SRS is UE-specific, the DL-RS for beam management is cell-specific. -◆Advantage 3: The average path loss for FR3 is approximately 5 to 10 dB higher than 3.5 GHz, and the SNR of the SRS may be low. -◆Advantage 4: To utilize SRS, UL-DL calibration is required for TDD and paired channel estimation / prediction for FDD.

[0219] However, the beam reporting in Type 2 PS CSI using the beam management procedure is not sufficiently considered. If such beam reporting is not sufficiently considered, there is a risk that communication quality / throughput will deteriorate.

[0220] Therefore, the present inventors have studied such beam reporting and conceived the following embodiments.

[0221] According to the following embodiments, beam reporting can be performed appropriately.

[0222] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0223] (Various Reinterpretations) In the present disclosure, a word enclosed in "( )" in a sentence may indicate an explanation of the word immediately preceding it (for example, an explanation of spelling), a paraphrase, a specific example, a supplementary explanation, etc. Furthermore, in the present disclosure, a word enclosed in "[ ]" in a sentence may be interpreted including the word in the meaning of the entire sentence, or may be interpreted excluding (ignoring) the word in the meaning of the entire sentence. Note that "( )" and "[ ]" may also be used for purposes / meanings other than those mentioned above.

[0224] 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."

[0225] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0226] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0227] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., messages from the core network such as positioning protocol (e.g., NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP)) messages), or a combination thereof.

[0228] 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.

[0229] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0230] In the present disclosure, ceil(x), ceiling function, and ceiling function may be interchangeable. In the present disclosure, floor(x), floor function, and floor function may be interchangeable. In the present disclosure, sqrt(x), square root of x, and root x may be interchangeable. In the present disclosure, x mod y, mod(x, y), mod function, and modulo operation may be interchangeable. In the present disclosure, Σ i=M M+N-1 f(i),Σ i=MM+N-1 f i , f(i) or f(i) for i=M, M+1, ..., M+N-1 i summation, f(M)+f(M+1)+...+f(M+N-1), f M +f M+1 +...+f M+N-1 , may be read interchangeably. C(n, k) is the number of combinations of selecting k values ​​from n values ​​(combinatorial coefficient), binomial coefficients, n C k , C n k , may be read as interchangeable. In the present disclosure, x / / y and floor(x / y) may be read as interchangeable.

[0231] In this disclosure, A b , A_b, Ab, and A with b added to the bottom right may be read interchangeably. c , A^c, and the notation of A with c added to the upper right may be read interchangeably. b c , A_b^c, and the notation in which b is added to the bottom right of A and c is added to the top right of A may be read interchangeably. ~ may be expressed by adding 〜 to the x, or may be referred to as x tilde. - may be represented by placing a - on top of the x, or may be referred to as an x-bar. ＾ may be represented by placing a ^ above the x, or may be called an x-hat.

[0232] In the present disclosure, FR may be, for example, at least one of FR1, FR2, FR2-1, FR2-2, FR3, sub-terahertz, and terahertz. In the present disclosure, the frequency range corresponding to FR1 may be 410-7125 MHz. In the present disclosure, FR2 may include FR2-1 and FR2-2, and the frequency range corresponding to FR2-1 may be 24250-52600 MHz, and the frequency range corresponding to FR2-1 may be 52600-71000 MHz.

[0233] In the present disclosure, the terms indicate, report, and select may be read interchangeably.

[0234] In the present disclosure, the terms beam, SD beam, precoder, antenna port, vector, SD basis, SD vector, SD basis vector, DFT basis, 2D DFT basis, angle, and angle of arrival (AoA) may be interchangeable. In the present disclosure, the terms angle, angular spectrum, spatial spectrum, angular distribution, spatial distribution, angular domain, spatial domain, angular range, specific range, and angular width may be interchangeable.

[0235] In the present disclosure, codebook (CB), codebook type, codeword (CW), PMI, CSI, and CSI report may be read interchangeably.

[0236] In the present disclosure, Type 2 CB, extended Type 2 CB, Type 2 port selection CB, extended Type 2 port selection CB, additional extended Type 2 port selection CB, and Type 2-based CB may be read interchangeably.

[0237] In the present disclosure, CSI-RS [resources] associated with more than one CSI-RS port, CSI-RS [resources] with more than one CSI-RS port, CSI-RS [resources] of more than one CSI-RS port, CSI-RS [resources] associated with N (> 1) ports, CSI-RS [resources] with N (> 1) ports, CSI-RS [resources] of N (> 1) ports, CSI-RS [resources] of more than two CSI-RS ports CSI-RS [resources] associated with a port, CSI-RS [resources] having more than two CSI-RS ports, CSI-RS [resources] of more than two CSI-RS ports, CSI-RS [resources] associated with N (> 2) ports, CSI-RS [resources] having N (> 2) ports, CSI-RS [resources] of N (> 2) ports, multi-port CSI-RS [resources], etc. may be read interchangeably.

[0238] In the present disclosure, CSI-RS resource, CRI, CMR, IMR, etc. may be read interchangeably.

[0239] In the present disclosure, Type 2PS CSI using beam management procedures, beam reporting using multi-port CSI-RS, beam reporting, L1-RSRP / L1-SINR reporting, L3-RSRP / L3-SINR reporting, RSRP / SINR reporting, L1-RSRP / L1-SINR-based beam reporting, CSI reporting, etc. may be read interchangeably.

[0240] In the present disclosure, beam, [CSI-RS] port, L1-RSRP / L1-SINR, L3-RSRP / L3-SINR, RSRP / SINR, CSI, etc. may be read interchangeably.

[0241] In the present disclosure, the terms "a CSI-RS [resource] is associated with X [CSI-RS] ports," "a CSI-RS [resource] has X [CSI-RS] ports," "a CSI-RS [resource] corresponds to X [CSI-RS] ports," etc. may be read interchangeably.

[0242] In the present disclosure, the CSI-RS [resource] associated with port X, the CSI-RS [resource] having port X, the CSI-RS [resource] of port X, etc. may be read interchangeably.

[0243] (Wireless Communication Method) First Embodiment The first embodiment relates to the configuration of CSI-RS resources.

[0244] For channel measurement for L1-RSRP / L1-SINR based beam reporting, a CSI-RS with N (>2) ports may be configured.

[0245] In this case, the existing (e.g., NR) CSI-RS port numbering may be reused / applied. Also, the existing (e.g., NR) (CSI-RS) resource mapping may be reused / applied.

[0246] In the existing resource mapping for a CSI-RS with more than one port, the frequency domain density may be 0.5 or 1. In the resource mapping for a 1-port CSI-RS for beam management, the frequency domain density may be 3 (i.e., the case where row is 1 in FIG. 1). To maintain the SNR, an increased frequency domain density for a CSI-RS with more than one port may be configured.

[0247] In one resource configuration (e.g., CSI reporting configuration), S When (≧1) CSI-RS resources are configured, each CSI-RS resource may be associated with one CSI-RS port, may be associated with two CSI-RS ports, or may be associated with N (>2) CSI-RS ports.

[0248] Each of one or more CSI-RS ports associated with one CSI-RS resource may correspond to one beam. For example, as shown in Figure 4, four CSI-RS ports (ports #1 to #4) associated with CRI #0 (CSI-RS resources corresponding to CRI #0) may correspond to four beams.

[0249] The beams (SD bases) corresponding to the CSI-RS ports associated with each CRI (or the corresponding CSI-RS resource) may be adjacent (e.g., FIG. 5A) or not (e.g., FIG. 5B). Also, as shown in FIGS. 5A and 5B, the beams (SD bases) corresponding to the CSI-RS ports associated with different CRIs may be different from each other.

[0250] It may be expected / assumed that the port numbers are the same for all CSI-RS resources in a resource configuration, and it may also be expected / assumed that the reference signal power per port / resource element (RE) is the same for all CSI-RS resources in a resource configuration.

[0251] The resource configuration may be cell-specific or UE-specific.

[0252] For L1-RSRP reporting, RSRP may be measured per port per CSI-RS resource.

[0253] Measurement of RSRP per port per CSI-RS resource may be applied in 1-port / 2-port CSI-RS reception.

[0254] For L1-SINR reporting, one or two resource configurations may be configured.

[0255] Since it is preferable to measure the SINR per CSI-RS port rather than per CSI-RS resource, the SINR measurement may follow at least one of the following options 1-1-1 and 1-1-2.

[0256] ◆ Option 1-1-1: When one resource configuration is configured, L1-SINR may be measured for each of the N CSI-RS ports within one CSI-RS resource.

[0257] ◆ Option 1-1-2: When two resource configurations are configured, the IMR may be CSI-IM or one-port NZP CSI-RS. For all CSI-RS ports within one CSI-RS resource (e.g., N CSI-RS ports), L1-SINR may be measured based on the same IMR.

[0258] In the above Option 1-1-2, of the two resource configurations, one resource configuration may be a configuration for channel measurement, and the other resource configuration may be a configuration for interference measurement.

[0259] <<Variations of the First Embodiment>> When one CSI-RS resource having N (>1) CSI-RS ports is configured, the method of utilizing multiple CSI-RS ports to calculate L1-RSRP / L1-SINR may be according to at least one of the following options 1-2-1 to 1-2-3.

[0260] ◆ Option 1-2-1: RSRP / SINR for each CSI-RS port may be calculated / reported.

[0261] ◆ Option 1-2-2: The average result / mean value (RSRP / SINR) across all CSI-RS ports (N (>1) CSI-RS ports) may be calculated / reported.

[0262] For example, in option 1-2-2, if one CSI-RS resource has four CSI-RS ports (e.g., CSI-RS ports #0, #1, #2, and #3), one RSRP / SINR may be calculated / reported, which may be an average result / average value across the four CSI-RS ports (CSI-RS ports #0, #1, #2, and #3).

[0263] ◆ Option 1-2-3: An average result / average value for each of A (<N) CSI-RS ports may be calculated / reported. That is, for N CSI-RS ports, multiple average results / average values ​​(RSRP / SINR) for each of A CSI-RS ports may be calculated / reported.

[0264] In Option 1-2-3, A may be 2 or more. Also, the A CSI-RS ports may be interpreted as a set / subset / group of CSI-RS ports. The N CSI-RS ports associated with one CSI-RS resource may include a plurality of A CSI-RS ports (sets / subsets / groups of CSI-RS ports).

[0265] For example, in Option 1-2-3, if one CSI-RS resource has four CSI-RS ports (e.g., CSI-RS ports #0, #1, #2, and #3), two RSRP / SINRs (e.g., a first RSRP / SINR and a second RSRP / SINR) may be calculated / reported. The first RSRP / SINR may be an average result / average value across two of the four CSI-RS ports (e.g., CSI-RS ports #0 and #1). The second RSRP / SINR may be an average result / average value across the remaining two of the four CSI-RS ports (e.g., CSI-RS ports #2 and #3) (not used in the calculation / reporting of the first RSRP / SINR). In this case, CSI-RS ports #0 and #1 (associated / corresponding to the first RSRP / SINR) may be referred to as the first [CSI-RS port] set / subset / group, and CSI-RS ports #2 and #3 (associated / corresponding to the second RSRP / SINR) may be referred to as the second [CSI-RS port] set / subset / group.

[0266] Which of the above options 1-2-1 to 1-2-3 is supported / applied may be in accordance with at least one of the following options 1-3-1 and 1-3-2.

[0267] ◆ Option 1-3-1: Of the above options 1-2-1 to 1-2-3, only one option may be supported.

[0268] ◆ Option 1-3-2: Of the above options 1-2-1 to 1-2-3, more than one option may be supported.

[0269] In option 1-3-2, one option (selected / applied from options 1-2-1 to 1-2-3) may be set / indicated by RRC signaling / MAC CE / DCI.

[0270] According to the first embodiment described above, multi-port CSI-RS resources can be appropriately configured.

[0271] Second Embodiment The second embodiment relates to the configuration of L1-RSRP / L1-SINR reporting.

[0272] In the present disclosure, a beam / L1-RSRP / L1-SINR report including only one CRI may be interchangeably referred to as a non-group-based [beam / L1-RSRP / L1-SINR] report, a first beam report, a first L1-RSRP / L1-SINR report, a first CSI report, etc.

[0273] In the present disclosure, a beam / L1-RSRP / L1-SINR report including more than one CRI may be interchangeably referred to as a group-based [beam / L1-RSRP / L1-SINR] report, a second beam report, a second L1-RSRP / L1-SINR report, a second CSI report, etc.

[0274] <<Embodiment 2.1>> Embodiment 2.1 relates to non-group-based reporting.

[0275] When multiple multi-port CSI-RS resources are configured for L1-RSRP / L1-SINR reporting (e.g., the first embodiment), the UE may select one CRI, multiple port indexes, and M (≦M) of the N CSI-RS ports that the reporting resource (i.e., one CSI-RS resource corresponding to the one CRI) has. max ) CSI-RS ports, and the corresponding L1-RSRP / L1-SINR values ​​for the CSI-RS ports.

[0276] The specific configuration for non-group-based reporting (e.g., CSI reporting configuration) may follow at least one of options 2-1-1 and 2-1-2 below.

[0277] ◆Option 2-1-1: M (value) may be set by specific settings (e.g., CSI reporting settings).

[0278] ◆Option 2-1-2: M max (The value of) M may be configured by a specific configuration (e.g., CSI reporting configuration), may be predefined by a specification, or may be reported by the UE as a capability. In this case, (the value of) M may be reported (by the UE).

[0279] <<Embodiment 2.2>> Embodiment 2.2 relates to group-based reporting.

[0280] When multiple multi-port CSI-RS resources are configured for L1-RSRP / L1-SINR reporting (e.g., the first embodiment), the UE s K different CRIs may be reported from the CSI-RS resources, where 2≦K≦K. max The maximum number of reported CRIs, K, may be satisfied. max may be defined in the specification, configured by a higher layer parameter, or reported by the UE as a capability. For the k+1 (k=0, 1, ..., K-1)-th reported CRI, the UE selects M of the N CSI-RS ports. k (k=0, 1, ..., K-1) CSI-RS ports may be selected / reported. k is M k ≦M max In the present disclosure, the k+1 (k=0, 1, ..., K-1)th reported CRI may be read as the k (k=1, 2, ..., K)th reported CRI. In the present disclosure, M k (k=0, 1, ..., K-1) CSI-RS ports are k This may also be interpreted as (k=1, 2, ..., K) CSI-RS ports.

[0281] M k The same options as those of M in the above embodiment 2.1 may be applied to kAt least one of options 2-1-1 and 2-1-2 may be applied in embodiment 2.2.) Also, M max The same options as in embodiment 2.1 above may be applied to this.

[0282] The base station may assume that multiple reported beams (corresponding to CSI-RS resources / CSI-RS ports) are received simultaneously by the UE. The UE may receive multiple reported beams (corresponding to CSI-RS resources / CSI-RS ports) simultaneously.

[0283] The multiple beams reported and received simultaneously may be used as multiple SD bases for Type 2 PS CSI.

[0284] The specific configuration for group-based reporting (e.g., CSI reporting configuration) may follow at least one of options 2-2-1 to 2-2-4 below.

[0285] ◆ Option 2-2-1: For existing CSI-RS (1-port / 2-port), K (value) may be configured by a specific configuration (e.g., CSI reporting configuration).

[0286] ◆ Option 2-2-2: For existing CSI-RS (1-port / 2-port), K max (The value of) K may be configured by a specific configuration (e.g., CSI reporting configuration) or may be predefined by a specification, in which case (the value of) K may be reported (by the UE).

[0287] ◆ Option 2-2-3: For N (> 2) port CSI-RS, K max (value) and M max (The value of) K may be set separately or may be predefined separately by a specification. In this case, (the value of) K and M k (The value of) may be reported.

[0288] ◆ Option 2-2-4: For N (>2) CSI-RS ports, the total number of reported CSI-RS ports across all CSI-RS resources may be configured by a specific configuration (e.g., CSI reporting configuration) or may be predefined by a specification. In this case, the value of K and M may be set (by the UE). k (The value of) may be reported.

[0289] 6 is a diagram showing an example of ports reported in group-based reporting. The UE may select two CSI-RS ports (e.g., port #2 and port #3) from among the CSI-RS ports associated with CRI #0. The UE may also select one CSI-RS port (e.g., port #4) from among the CSI-RS ports associated with CRI #1. The UE may report the selected CSI-RS ports (e.g., port #2 and port #3 associated with CRI #0 and port #4 associated with CRI #1) in one beam report.

[0290] The UE may determine whether to apply the above-described embodiment 2.1 or 2.2 (or may switch between the operations of embodiment 2.1 and 2.2) based on a specific condition. The specific condition may be receiving information indicating the application of embodiment 2.1 / 2.2 (e.g., higher layer parameters), reporting a capability indicating support for embodiment 2.1 / 2.2, etc.

[0291] According to the second embodiment described above, the UE can appropriately perform L1-RSRP / L1-SINR reporting according to the above configuration. When a multi-port CSI-RS for beam management is used, delay can be reduced through simultaneous transmission / reception of multiple beams (e.g., procedures (1a) and (1b) in FIG. 3 can be simplified). Furthermore, by combining with group-based beam reporting, multiple beam reporting in a single reporting instance can be extended.

[0292] <Third Embodiment> The third embodiment relates to the contents of an L1-RSRP / L1-SINR report.

[0293] The UE may report at least one of the CRI, the port index, and the value of L1-RSRP / L1-SINR.

[0294] <<Embodiment 3.1>> Embodiment 3.1 relates to reporting of CRI and port index.

[0295] Based on the configuration of Option 2-1-1 and Option 2-1-2 in embodiment 2.1, each of the M selected port indices (corresponding to CSI-RS ports) may be reported using ceil(log2N) bits. Alternatively, a combination of the M selected port indices (corresponding to CSI-RS ports) may be reported using ceil(log2C(N,M)) bits. Also, for the configuration of Option 2-1-2 in embodiment 2.1, the value of M may be reported using ceil(log2M max ) bit.

[0296] Based on the settings of Option 2-2-1 and Option 2-2-2 in embodiment 2.2, each of the K CRIs is expressed as ceil(log2K s Alternatively, a combination of K CRIs may be reported using ceil(log2C(K s ,K)) bits. Also, for the setting of Option 2-2-2 in embodiment 2.1, (the value of) K may be reported using ceil(log2K max ) bit.

[0297] Reporting based on the settings of Option 2-2-3 and Option 2-2-4 in embodiment 2.2 may follow at least one of Options 3-1-1 to 3-1-4 below.

[0298] ◆ Option 3-1-1: In this option, the reporting of K CRIs and (the value of) K may follow the same method as the reporting of K CRIs and (the value of) K based on the settings of Option 2-2-1 and Option 2-2-2 in the above-mentioned embodiment 2.2. That is, each of the K CRIs is expressed as ceil(log2K sAlternatively, a combination of K CRIs may be reported using ceil(log2C(K s ,K)) bits, and if K is ceil(log2K max ) bit.

[0299] In Option 3-1-1, for each reported CRI, M k The value of ceil(log2M max ) bits (M0, M1, M2, ..., M K-1 Each of these is ceil(log2M max ) bit).

[0300] In Option 3-1-1, for each reported CRI, M k Each of the selected port indices (corresponding to CSI-RS ports) may be reported using ceil(log2N) bits. k The (one) combination of the selected port indices (corresponding to the CSI-RS ports) is ceil(log2C(N,M k )) bit.

[0301] ◆ Option 3-1-2: In this option, the reporting of K CRIs and (the value of) K may follow the same method as the reporting of K CRIs and (the value of) K based on the settings of Option 2-2-1 and Option 2-2-2 in the above-mentioned embodiment 2.2. That is, each of the K CRIs is expressed as ceil(log2K s Alternatively, a combination of K CRIs may be reported using ceil(log2C(K s ,K)) bits, and if K is ceil(log2K max ) bit.

[0302] In option 3-1-2, Σ over all reported CRIs (K CRIs) k=0 K-1 M kA combination of port indices (corresponding to CSI-RS ports) is expressed as ceil(log2C(NK,Σ k=0 K-1 M k )) bit, thereby M k The values ​​of M0, M1, M2, ..., M K-1 may each be implied).

[0303] ◆Option 3-1-3: (K s (across CSI-RS resources)Σ k=0 K-1 M k A combination of port indices (corresponding to CSI-RS ports) is expressed as ceil(log2C(NK,Σ k=0 K-1 M k )) bits, thereby reporting K CRIs and M k may be implied (K CRIs and M0, M1, M2, ..., M K-1 may each be implied).

[0304] ◆ Option 3-1-4: NK s A bitmap with K CRIs and M k may be implied (K CRIs and M0, M1, M2, ..., M K-1 may each be implied).

[0305] <<Embodiment 3.2>> Embodiment 3.2 relates to reporting of L1-RSRP / L1-SINR values.

[0306] The L1-RSRP / L1-SINR value(s), if reported, may follow at least one of options 3-2-1 to 3-2-3 below.

[0307] ◆ Option 3-2-1: Individual L1-RSRP / L1-SINR values ​​for each selected port for each reported CRI (L1-RSRP / L1-SINR values ​​for each selected port) may be reported.

[0308] ◆ Option 3-2-2: One individual L1-RSRP / L1-SINR value for each reported CRI may be reported. This option may be applied even when multiple ports within one CSI-RS resource are reported.

[0309] In option 3-2-2, for example, 16 beams in four CRIs each having four ports may be reported using four RSRP values, i.e., in option 3-2-2, an L1-RSRP / L1-SINR value may be reported for each reported CRI, and each reported CRI may have one or more CSI-RS ports.

[0310] ◆ Option 3-2-3: One L1-RSRP / L1-SINR value for all reported beams may be reported.

[0311] In option 3-2-3, for example, 16 beams in four CRIs each with four ports may be reported using one RSRP value.

[0312] Embodiment 3.2 may follow existing quantization rules (i.e., differential quantization).

[0313] In embodiment 3.2, other dynamic ranges may be used, i.e., not necessarily limited to the existing 7-bit / 4-bit combination.

[0314] <<Variations of Embodiment 3.1>> The selection of RSRP / SINR reporting may follow at least one of the following options 3-3-1 and 3-3-2.

[0315] ◆Option 3-3-1: K max ×M max Among the X RSRP / SINR measurements, the X best measurements (and their corresponding CRIs and port indices) may be reported.

[0316] ◆ Option 3-3-2: K maxM for each of the CSI-RS resources max The average RSRP / SINR across the ports may be compared, and the CSI-RS resource with the best average RSRP / SINR may be selected. For the selected CSI-RS resource, M RSRP / SINR measurements may be reported.

[0317] In this disclosure, the terms "best," "highest," "largest," "biggest," etc. may be read interchangeably.

[0318] The RSRP / SINR measurement result may be at least one of the following options 3-4-1 and 3-4-2.

[0319] ◆ Option 3-4-1: One absolute value for one measurement result (for example, the best measurement result) and differential values ​​for all other measurement results.

[0320] ◆Option 3-4-2: Absolute values ​​for all measurement results.

[0321] According to the third embodiment described above, the UE can appropriately report the L1-RSRP / L1-SINR value for each CRI or each port index.

[0322] <Fourth Embodiment> The fourth embodiment relates to the QCL relationship of multi-port CSI-RS resources.

[0323] When multiple multi-port CSI-RS resources are configured for L1-RSRP / L1-SINR reporting (e.g., the first embodiment), each CSI-RS resource may be configured with one QCL source RS or one set of QCL source RSs, which may be at least one of SSB and other P-CSI-RS resources.

[0324] In this case, at least QCL type D may be supported / configured as a QCL parameter. Also, if applicable, other QCL types (e.g., at least one of QCL types A, B, and C) may be supported / configured.

[0325] All ports of the multi-port CSI-RS within that (single) CSI-RS resource may be set / configured / indicated / defined to be QCL with the same QCL source RS, and the UE may assume that all ports of the multi-port CSI-RS within that (single) CSI-RS resource are QCL with the same QCL source RS.

[0326] 7 is a diagram showing an example of the QCL relationship of multi-port CSI-RS resources. In FIG. 7, all four ports of CRI#0 (ports#1 to #4 of CRI#0) are QCL'd with SSB#0, and all four ports of CRI#1 (ports#1 to #4 of CRI#1) are QCL'd with SSB#1.

[0327] Each port of the multi-port CSI-RS within the (single) CSI-RS resource may be set / configured / indicated / defined as being QCL'd with a separate (different) QCL source RS, and the UE may assume that each port of the multi-port CSI-RS within the (single) CSI-RS resource is QCL'd with a separate (different) QCL source RS.

[0328] 8 is a diagram showing an example of the QCL relationship of multi-port CSI-RS resources. As shown in FIG. 8, each of the four ports (ports #1 to #4 of CRI #0) of CRI #0 may have a different SSB and QCL. Similarly, each of the four ports (ports #1 to #4 of CRI #1) of CRI #1 may have a different SSB and QCL. One port of CRI #0 and one port of CRI #1 may have the same SSB and QCL, or may have different SSB and QCL.

[0329] When multiple multi-port CSI-RS resources are configured for L1-RSRP / L1-SINR reporting (e.g., the first embodiment) and the time domain behavior (of those multi-port CSI-RS resources) is periodic or semi-persistent (i.e., the CSI-RS transmitted in those multi-port CSI-RS resources is P-CSI-RS or SP-CSI-RS), each port of one resource (one of those multi-port CSI-RS resources) may be configured as a QCL source RS for one or more other RSs / channels.

[0330] According to the fourth embodiment described above, the QCL relationship of the multi-port CSI-RS resources can be appropriately determined.

[0331] Fifth Embodiment The fifth embodiment relates to beam updating using multi-port CSI-RS resources.

[0332] The above-described embodiments may be applied when P-CSI-RS / SP-CSI-RS / AP-CSI-RS resources are configured, and when periodic / semi-persistent / aperiodic / event-triggered beam reporting is configured, in which case existing signaling for configuration / activation / deactivation may be reused.

[0333] Periodic / semi-persistent / aperiodic / event-triggered beam updates may be supported for P-CSI-RS / SP-CSI-RS / AP-CSI-RS resources, and the beam updates may follow at least one of options 5-1 and 5-2 below.

[0334] ◆Option 5-1: The UE may be configured to report a complete (new) beam list for beam update (i.e., at least one of the CRI, port index, and L1-RSRP / L1-SINR values ​​described in embodiment 3).

[0335] ◆Option 5-2: The UE may be configured to update the list of previously reported beams through reporting.

[0336] Option 5-2 may further be in accordance with at least one of the following options 5-2-1 and 5-2-2.

[0337] ◆Option 5-2-1: Through the report, the beam index may be deleted / released.

[0338] ◆Option 5-2-2: Through the report, at least one of the beam index and L1-RSRP / L1-SINR values ​​may be added / updated.

[0339] According to the fifth embodiment described above, it is possible to appropriately update beams using multi-port CSI-RS resources.

[0340] <Variation 1> The above-described multi-beam reporting may be applied to SSB-based L1-RSRP / L1-SINR reporting.

[0341] SSB may be time division multiplexed (TDM) or frequency division multiplexed (FDM).

[0342] A UE with one receive panel (Rx panel) may receive one SSB (TDMed) in a certain time resource.

[0343] A UE with multiple receiving panels may simultaneously receive multiple SSBs (FDM-encoded) in a given time resource. The period of the multiple SSBs (FDM-encoded) may be the same as in existing specifications (e.g., NR).

[0344] The above-mentioned multiple beam reporting may be applied to SSB-based L1-RSRP / L1-SINR reporting only if the SSB is configured for channel measurement for L1-RSRP / L1-SINR reporting.

[0345] The above-mentioned embodiment 2.2 may be applied to L1-RSRP / L1-SINR reporting using SSB, i.e., the UE may be configured to report more than two SSBs (SSB indexes and L1-RSRP / L1-SINR values).

[0346] <Variation 2> 256 beams may be transmitted using 32 CSI-RS resources with 8 ports per CSI-RS resource.

[0347] The UE may be configured to report up to 16 beams and their RSRPs.

[0348] K max may be up to 4, and M per reported CRI max may be up to four.

[0349] The beam reporting may be based on Option 3-1-1 above. For example, if the UE reports four CRIs and four ports for each CRI, the UE may report up to K max = 4 CRI number K reported ceil(log2K max )) = 2 bits, and for each CRI, K S = ceil(log2K) for reporting one CRI out of 32 CRIs S )) = 5 bits, and a maximum of M max = 4 for the number of ports M reported as ceil(log2M max )) = 2 bits, and for each port, ceil(log2N)) = 3 bits may be used to report one port index out of N = 8 port indexes. RSRP reporting may be based on Option 3-2-2 above. For example, the average RSRP of the CRI with the largest RSRP may be quantized to 7 bits, and other differential values ​​for the other K-1 = 3 CRIs may be quantized to 4 bits. In this case, the (maximum) payload size of the beam report may be 2 + 4 × (5 + 2 + 4 × 3) + 7 + 3 × 4 = 95 bits. This payload size limits reporting overhead, and PUCCH format 2 can be used for reporting.

[0350] <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, RRC message, LTE positioning protocol (LPP) message), specific signals / channels (e.g., DCI, PDCCH, PDSCH, reference signal), or a combination thereof.

[0351] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards. The MAC CE may be an extension of an existing MAC CE. For example, the MAC CE may be an existing MAC CE with a new octet introduced.

[0352] When the notification is performed by a DCI, the notification may be performed by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc. The specific field may be an existing DCI field or a new DCI field. The RNTI may be an existing RNTI or a new RNTI. The format of the DCI may be an existing DCI format or a new DCI format.

[0353] In addition, notification of any information to the UE in the above embodiments may be periodic, semi-persistent (triggered by the UE or the gNB), or aperiodic (triggered by the UE or the gNB).

[0354] In the above embodiment, the UE may receive information on at least one of the following QCL rules from the NW: QCL Type A QCL Type B QCL Type C QCL Type D

[0355] In the above embodiment, the QCL source RS for each QCL type may be at least one of the following several RSs: ◆ SSB ◆ CSI-RS with / without repetition ◆ TRS ◆ DMRS of PDCCH / PDSCH

[0356] In the above-described embodiment, the information from the NW may be set / instructed by the following methods: Common to multiple UEs or UE-specific Cell-specific or common to multiple cells Per UE / per CC / per BWP / per band / per cell / per cell group (CG)

[0357] <<Notification of Information from UE>> In the above-described embodiments, notification of any information from the UE [to the NW] (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE, RRC message, LPP message), specific signals / channels (e.g., UCI, PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0358] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader. The MAC CE may be an extension of an existing MAC CE. For example, the MAC CE may be an extension of an existing MAC CE by introducing a new octet.

[0359] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0360] In addition, notification of any information from the UE in the above embodiments may be periodic, semi-persistent (triggered by the UE or the gNB), or aperiodic (triggered by the UE or the gNB).

[0361] <<Regarding Application of Each Embodiment>> In a UE / BS, specific (one or more) processes / operations / controls / assumptions / information for at least one of the above-mentioned embodiments may be applied (used) when one or more of the following conditions are met: - a higher layer parameter indicating the specific processes / operations / controls / assumptions / information is configured; - the specific processes / operations / controls / assumptions / information is determined based on related higher layer parameters; - the specific processes / operations / controls / assumptions / information is specified / activated / triggered by a MAC CE / DCI / UCI / resource / channel / RS; - a specific UE capability indicating (or related to) the specific processes / operations / controls / assumptions / information is reported or supported; - the application of the specific processes / operations / controls / assumptions / information is determined based on specific conditions.

[0362] The specific UE capability may indicate at least one of the following: ◆ Supporting the specific process / operation / control / assumption / information ◆ Capability of each embodiment ◆ Capability of each option in each embodiment, or capability of a combination of multiple options in each embodiment ◆ Capability of each option in each embodiment, or capability of a combination of multiple options in each embodiment.

[0363] 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).

[0364] 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)).

[0365] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0366] The information on whether one or more of the above embodiments / options / choices / examples apply / are used, or which of several of the above embodiments / options / choices / examples apply / are used, may be based on several of the following methods: ◆ The information is configured by one or more higher layer parameters / RRC IEs. ◆ The information is determined by one or more related higher layer parameters / RRC IEs. ◆ The information is indicated by a MAC CE / DCI. ◆ The information is based on one or more UE capabilities. ◆ The information is described / defined in a specification. ◆ The information is based on conditions described / defined in a specification. ◆ The information is determined by a combination of several of the above information. For example, the information is determined by the configuration / indication of higher layer parameters / MAC CE / DCI and reported by a UE capability.

[0367] The above embodiments / options / choices may be combined into one embodiment / option / choice.

[0368] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver that receives a configuration for a plurality of Channel State Information (CSI)-Reference Signal (RS) resources, each having more than two ports; and a controller that controls reporting of at least one of Reference Signal Received Power (RSRP) and Signal to Interference plus Noise Ratio (SINR) corresponding to at least one of the more than two ports based on the configuration. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the controller measures at least one of the RSRP and the SINR for each port. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the controller measures at least one of the RSRP and the SINR across all of the more than two ports. [Supplementary Note 4] The terminal according to any one of Supplements 1 to 3, wherein the controller measures at least one of the RSRP and the SINR for each of a plurality of ports within the more than two ports.

[0369] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver that receives a configuration for a plurality of Channel State Information (CSI)-Reference Signal (RS) resources, each having more than two ports; and a controller that controls reporting of one or more ports corresponding to each of a portion of the plurality of CSI-RS resources based on the configuration. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the controller controls reporting of the number of the portion of CSI-RS resources and the number of ports corresponding to each of the portion of CSI-RS resources. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the controller assumes that all of the more than two ports corresponding to one CSI-RS resource of the plurality of CSI-RS resources are quasi-co-located with the same reference signal. [Supplementary Note 4] The control unit assumes that more than two ports corresponding to one CSI-RS resource among the plurality of CSI-RS resources are quasi-colocated with different reference signals. The terminal according to any one of Supplementary Note 1 to Supplementary Note 3.

[0370] (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.

[0371] 9 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).

[0372] 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.

[0373] 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.

[0374] 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))).

[0375] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The location, number, shape, size, etc. of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as the base station 10.

[0376] The wireless communication system 1 may utilize multi-input multi-output (MIMO). For example, one cell may be formed by one antenna / base station 10, or may be formed by multiple antennas / base stations 10. One [virtual] cell (which may be called, for example, a supercell) may be composed of multiple [virtual] cells (which may be called, for example, subcells). A supercell may correspond to a cell with a fixed physical range, and a subcell may correspond to a cell with a quasi-static / dynamically variable physical range. In this case, the wireless communication system 1 may be called a cell-free system.

[0377] 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).

[0378] 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.

[0379] 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.

[0380] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 / Xn interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0381] 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.

[0382] 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.

[0383] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0384] 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).

[0385] 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.

[0386] 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.

[0387] 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.

[0388] 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).

[0389] 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.

[0390] 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.

[0391] 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.

[0392] 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.

[0393] 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.

[0394] 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.

[0395] 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.

[0396] 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.

[0397] 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).

[0398] (Base Station) Fig. 10 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.

[0399] 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.

[0400] 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.

[0401] 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.

[0402] 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.

[0403] 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.

[0404] 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.

[0405] 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.

[0406] 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.

[0407] 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.

[0408] 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.

[0409] 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.

[0410] 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.

[0411] 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.

[0412] 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.

[0413] 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.

[0414] 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.

[0415] The base station 10 may be separated into three elements: a radio unit (RU), a distributed unit (DU), and a central unit (CU). For example, the RU may implement RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level functions of the physical layer (precoding, IFFT, FFT, etc.). The DU may implement higher-level functions of the physical layer (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may implement the functions of the PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer.

[0416] In the present disclosure, the base station 10 may include a single device that realizes all of the functions of the RU, DU, and CU, or may include multiple devices that each realize some of the functions of the RU, DU, and CU and are connected to each other. In the present disclosure, the base station 10 may be interchangeably read as RU / DU / CU.

[0417] The transceiver 120 may transmit configurations for one or more Channel State Information (CSI)-Reference Signal (RS) resources, each having more than two ports (e.g., the first embodiment, the second embodiment).

[0418] The control unit 110 may also control the reception of reports of at least one of Reference Signal Received Power (RSRP) and Signal to Interference plus Noise Ratio (SINR) corresponding to at least one of the more than two ports, which are transmitted based on the settings (e.g., the first embodiment).

[0419] The control unit 110 may also control the reception of reports of one or more ports corresponding to each of some of the CSI-RS resources among the plurality of CSI-RS resources, which are transmitted based on the setting (e.g., the second embodiment, the third embodiment).

[0420] (User Terminal) Fig. 11 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.

[0421] 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.

[0422] 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.

[0423] 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.

[0424] 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.

[0425] 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.

[0426] 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.

[0427] 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.

[0428] 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.

[0429] 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.

[0430] 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.

[0431] 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.

[0432] 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.

[0433] 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.

[0434] 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.

[0435] 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.

[0436] The measurement unit 223 may derive channel measurements for CSI calculation based on 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 interference measurement resources. The interference measurement resources may be at least one of NZP CSI-RS resources for interference measurement, CSI-Interference Measurement (IM) resources, 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.

[0437] 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.

[0438] In addition, the transceiver unit 220 may receive configurations for multiple Channel State Information (CSI)-Reference Signal (RS) resources, each having more than two ports (e.g., the first embodiment, the second embodiment).

[0439] The control unit 210 may measure at least one of the RSRP and the SINR for each port (for example, the first embodiment).

[0440] The control unit 210 may measure at least one of the RSRP and the SINR across all of the more than two ports (e.g., the first embodiment).

[0441] The control unit 210 may measure at least one of the RSRP and the SINR for each of a plurality of ports among the two or more ports (for example, the first embodiment).

[0442] The control unit 210 may control reporting of the number of the partial CSI-RS resources and the number of ports corresponding to each of the partial CSI-RS resources (e.g., the second embodiment, the third embodiment).

[0443] The control unit 210 may assume that all of the more than two ports corresponding to one CSI-RS resource among the plurality of CSI-RS resources are quasi-colocated with the same reference signal (e.g., the fourth embodiment).

[0444] The control unit 210 may assume that more than two ports corresponding to one CSI-RS resource among the plurality of CSI-RS resources are quasi-colocated with different reference signals (e.g., the fourth embodiment).

[0445] (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.

[0446] 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.

[0447] For example, a base station, a user terminal, or the like according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 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, and the like.

[0448] 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.

[0449] 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.

[0450] 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.

[0451] 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.

[0452] 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.

[0453] 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.

[0454] 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.

[0455] 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.

[0456] 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).

[0457] 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.

[0458] 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.

[0459] In addition, the devices included in the core network 30 (for example, network nodes that provide NF) may also be realized by the above-mentioned functional block / hardware configuration.

[0460] (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.

[0461] 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.

[0462] 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.

[0463] 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.

[0464] 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.

[0465] 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.

[0466] For example, one subframe may be referred to as a TTI, 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.

[0467] 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.

[0468] 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.

[0469] 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.

[0470] 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.

[0471] 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.

[0472] 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.

[0473] 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.

[0474] 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.

[0475] 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.

[0476] 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.

[0477] 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.

[0478] 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."

[0479] 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.

[0480] 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.

[0481] 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.

[0482] 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.

[0483] 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.

[0484] 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.

[0485] With respect to any information (e.g., variables, constants, parameters) described in the present disclosure, even if not specifically stated in the above embodiments, any first device (e.g., UE / base station) may notify any second device (e.g., base station / UE) of information indicating / specifying (or relating to) the value of the any information.

[0486] 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.

[0487] 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).

[0488] 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).

[0489] 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).

[0490] 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.

[0491] 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.

[0492] 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).

[0493] 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.

[0494] 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.

[0495] 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.

[0496] 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.

[0497] 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.

[0498] 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.

[0499] 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.

[0500] 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.

[0501] 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.

[0502] 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.

[0503] 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.

[0504] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0505] 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.

[0506] 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.

[0507] 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.

[0508] 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.

[0509] 13 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.

[0510] 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.

[0511] 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).

[0512] 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.

[0513] 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.

[0514] 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.

[0515] 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.

[0516] 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.

[0517] 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).

[0518] 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.

[0519] 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)).

[0520] 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.

[0521] 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.

[0522] 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.

[0523] 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.

[0524] 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.

[0525] 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).

[0526] 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."

[0527] 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.

[0528] 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.

[0529] 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.

[0530] 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.

[0531] 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...."

[0532] 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 ..." or "do ... (if the above "..." is a to-infinitive, a verb with "to")," etc. "does not expect ..." may be interchangeably read as "be not expected ..." or "does not ... (if the above "..." is a to-infinitive, a verb with "to")," etc. 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" (for example, if apparatus A is a UE, apparatus B may be a base station).

[0533] 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.

[0534] 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."

[0535] 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.

[0536] 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."

[0537] 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.

[0538] 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.

[0539] 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 any integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0540] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0541] 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.

[0542] 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.

[0543] 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

a receiver for receiving configurations for a plurality of Channel State Information (CSI)-Reference Signal (RS) resources, each having more than two ports; A terminal having a control unit that controls reporting of at least one of Reference Signal Received Power (RSRP) and Signal to Interference plus Noise Ratio (SINR) corresponding to at least one port among the more than two ports based on the setting. 　 The terminal according to claim 1 , wherein the control unit measures at least one of the RSRP and the SINR for each port. 　 The terminal of claim 1 , wherein the control unit measures at least one of the RSRP and the SINR across all of the more than two ports. 　 The terminal according to claim 1 , wherein the control unit measures at least one of the RSRP and the SINR for each of a plurality of ports in the more than two ports. 　 receiving a configuration for one or more Channel State Information (CSI)-Reference Signal (RS) resources, each having more than two ports; and controlling reporting of at least one of Reference Signal Received Power (RSRP) and Signal to Interference plus Noise Ratio (SINR) corresponding to at least one of the more than two ports based on the setting. 　 a transmitter configured to transmit configurations for one or more Channel State Information (CSI)-Reference Signal (RS) resources, each having more than two ports; a control unit that controls reception of reports of at least one of Reference Signal Received Power (RSRP) and Signal to Interference plus Noise Ratio (SINR) corresponding to at least one port among the more than two ports, which are transmitted based on the setting.

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