Terminal, wireless communication method, base station, and system

Abstract

A terminal according to an aspect of the present disclosure includes: a control unit that controls generation of a joint CSI report including the first CSI and the second CSI on the assumption that a first rank represented by first channel state information, i.e., first CSI, and a second rank represented by second CSI are subject to certain restrictions; and a transmission unit that transmits the joint CSI report. According to an aspect of the present disclosure, it is possible to appropriately perform measurement and reporting of CSI for a multi-panel / TRP.

Description

Technical Field

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

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates, low latency, etc. (Non-Patent Document 1). In addition, for the purpose of further large capacity and high performance of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel. 10-14) has been standardized.

[0003] Research is also underway on a successor system to LTE (for example, also referred to as the 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.).

[0004] Prior Art Documents

[0005] Non-Patent Documents

[0006] Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] In NR, it is being studied to perform DL transmission (e.g., PDSCH transmission) to a user terminal (user terminal, User Equipment (UE)) using one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) with one or more panels (multi-panel).

[0009] However, in the NR specifications such as Rel.15 up to now, multi-panel / TRP has not been considered. Therefore, it is not clear how to perform the measurement and reporting of CSI in the case of using multi-panel / TRP. If the measurement and reporting of CSI are not properly performed, there is a concern about a decrease in system performance such as a reduction in throughput.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can properly perform the measurement and reporting of CSI for multi-panel / TRP.

[0011] Means for Solving the Problem

[0012] A terminal according to one aspect of the present disclosure includes: a control unit that controls the creation of a joint CSI report including the first CSI and the second CSI on the assumption that the first rank represented by the first channel state information, i.e., the first CSI, and the second rank represented by the second CSI are subject to certain constraints; and a transmission unit that transmits the joint CSI report.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, it is possible to properly perform the measurement and reporting of CSI for multi-panel / TRP. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a diagram showing an example of CSI report setting in Rel.15 NR.

[0016] Figure 2 It is a diagram showing an example of a multi-TRP scenario.

[0017] Figure 3 It is a diagram showing an example of CSI report setting according to the first embodiment.

[0018] Figure 4 It is a diagram showing an example of an RRC parameter indicating a CSI feedback type.

[0019] Figure 5 It is a diagram showing an example of a joint CSI setting.

[0020] Figure 6This is a diagram showing an example of CSI report settings according to the second embodiment.

[0021] Figure 7 This is a diagram showing an example of CSI report settings according to the second embodiment.

[0022] Figure 8 This is a diagram showing an example of CSI report settings according to the second embodiment.

[0023] Figure 9 This is a diagram showing an example of CSI report settings according to the second embodiment.

[0024] Figure 10 This is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment.

[0025] Figure 11 This is a diagram showing an example of the structure of a base station according to an embodiment.

[0026] Figure 12 This is a diagram showing an example of the structure of a user terminal according to an embodiment.

[0027] Figure 13 This is a diagram showing an example of the hardware structure of a base station and a user terminal according to an embodiment. Detailed Embodiment

[0028] (CSI Report (CSI report or reporting))

[0029] In Rel.15 NR, a terminal (also referred to as a user terminal, User Equipment (UE), etc.) generates (also referred to as determines, calculates, estimates, measures, etc.) channel state information (Channel State Information (CSI)) based on a reference signal (Reference Signal (RS)) (or the resources for the RS), and sends (also referred to as reports, feedbacks, etc.) the generated CSI to the network (e.g., a base station). This CSI can be sent to the base station using, for example, an uplink control channel (e.g., Physical Uplink Control Channel (PUCCH)) or an uplink shared channel (e.g., Physical Uplink Shared Channel (PUSCH)).

[0030] The RS used in the generation of CSI may also be at least one of, for example, a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Broadcast Channel (Synchronization Signal / Physical Broadcast Channel (SS / PBCH)) block, a Synchronization Signal (SS), a Demodulation Reference Signal (DMRS), etc.

[0031] The CSI-RS may also include at least one of a Non Zero Power (NZP) CSI-RS and a CSI-Interference Management (CSI-IM). The SS / PBCH block is a block that includes an SS and a PBCH (and the corresponding DMRS), and may also be referred to as an SS block (SSB), etc. In addition, the SS may also include at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).

[0032] In addition, the CSI may also include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), an SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), a Layer 1 Reference Signal Received Power (L1-RSRP), a Reference Signal Received Quality (L1-RSRQ), a Signal to Interference plus Noise Ratio (L1-SINR), a Signal to Noise Ratio (L1-SNR), etc.

[0033] The UE may also receive information related to the CSI report (report configuration information) and control the CSI report based on the report configuration information. For example, the report configuration information may also be the "CSI-ReportConfig" of an Information Element (IE) of Radio Resource Control (RRC). In addition, in the present disclosure, the RRC IE may also be interchangeable with RRC parameters, higher layer parameters, etc.

[0034] The report configuration information (e.g., "CSI-ReportConfig" of the RRC IE) may also include at least one of the following, for example.

[0035] · Information related to the type of CSI report (report type information, e.g., "reportConfigType" of the RRC IE)

[0036] · Information related to one or more quantities of CSI to be reported (one or more CSI parameters) (report quantity information, e.g., "reportQuantity" of the RRC IE)

[0037] · Information related to the resource for RS used in the generation of the quantity (the CSI parameter) (resource information, e.g., "CSI-ResourceConfigId" of RRC IE)

[0038] · Information related to the frequency domain that is the object of the CSI report (frequency domain information, e.g., "reportFreqConfiguration" of RRC IE)

[0039] For example, the report type information can also represent (indicate) a periodic CSI (Periodic CSI (P-CSI)) report, an aperiodic CSI (Aperiodic CSI (A-CSI)) report, or a semi-persistent CSI (Semi-Persistent CSI (SP-CSI)) report.

[0040] In addition, the reported quantity information can also specify a combination of at least one of the above CSI parameters (e.g., CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0041] In addition, the resource information can also be the ID of the resource for RS. The resource for RS can also include, for example, a CSI-RS resource with non-zero power or an SSB, and a CSI-IM resource (e.g., a CSI-RS resource with zero power).

[0042] In addition, the frequency domain information can also represent the frequency granularity of the CSI report. The frequency granularity can also include, for example, wideband and subbands. The wideband is the entire CSI reporting band. The wideband can be, for example, the entire certain carrier (Component Carrier (CC), cell, serving cell), or the entire bandwidth part (Bandwidth part (BWP)) within a certain carrier. The wideband can also be replaced with the CSI reporting band, the entire CSI reporting band (the entire CSI reporting band), etc.

[0043] In addition, the subband is a part within the wideband and can be composed of one or more resource blocks (Resource Block (RB) or Physical Resource Block (PRB)). The size of the subband can also be determined according to the size of the BWP (number of PRBs).

[0044] The frequency domain information can also indicate which of the wideband or subbands the PMI is reported for (the frequency domain information can also include, for example, the "pmi-FormatIndicator" of the RRC IE used to determine either the wideband PMI report or the subband PMI report). The UE can also determine the frequency granularity of the CSI report (i.e., either the wideband PMI report or the subband PMI report) based on at least one of the above-reported quantity information and the frequency domain information.

[0045] In the case where the wideband PMI report is set (determined), one wideband PMI can also be reported for the entire CSI reporting band. On the other hand, in the case where the subband PMI report is set, a single wideband indication i1 can also be reported for the entire CSI reporting band, and one or more subband indications i2 (e.g., subband indications for each subband) for each subband within the entire CSI report can also be reported.

[0046] The UE uses the received RS for channel estimation and estimates the channel matrix H. The UE feeds back an index (PMI) determined based on the estimated channel matrix.

[0047] The PMI can also represent a precoder matrix (which can also be abbreviated as a precoder) that the UE believes is suitable for downlink (DL) transmission to the UE. Each value of the PMI can also correspond to a precoder matrix. The set of values of the PMI can also correspond to a set of different precoder matrices called a precoder codebook (which can also be abbreviated as a codebook).

[0048] In the space domain, the CSI report can also include one or more types of CSI. For example, the CSI can include at least one of a first type (Type 1 CSI) used in the selection of a single beam and a second type (Type 2 CSI) used in the selection of multiple beams. A single beam can also be replaced by a single layer, and multiple beams can also be replaced by multiple beams. In addition, Type 1 CSI may not assume multi-user multiple input multiple output (MIMO), and Type 2 CSI may assume multi-user MIMO.

[0049] The above codebook may also include a codebook for type 1 CSI (also referred to as type 1 codebook, etc.) and a codebook for type 2 CSI (also referred to as type 2 codebook, etc.). In addition, type 1 CSI may also 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 specified respectively.

[0050] In the present disclosure, type 1 and type I may also be interchangeable. In the present disclosure, type 2 and type II may also be interchangeable.

[0051] The uplink control information (UCI) type may also include at least one of hybrid automatic repeat request acknowledgement (HARQ-ACK), scheduling request (SR), and CSI. UCI can be carried either by PUCCH or by PUSCH.

[0052] In Rel.15 NR, UCI can include one CSI part for wideband PMI feedback. When CSI report #n is reported, it includes wideband PMI information.

[0053] 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 information and several subband PMI information. CSI part 1 and CSI part 2 are separated and encoded.

[0054] In Rel.15 NR, the UE is set by the higher layer with N (N≥1) reporting settings for CSI report settings and M (M≥1) resource settings for CSI resources. For example, as Figure 1As shown, the CSI report setting (CSI-ReportConfig) includes resource settings for channel measurement (resourcesForChannelMeasurement), CSI-IM resource settings for interference (csi-IM-ResourceForInterference), NZP-CSI-RS resource settings for interference (nzp-CSI-RS-ResourceForInterference), report quantity (reportQuantity), etc. The resource settings for channel measurement, the CSI-IM resource settings for interference, and the NZP-CSI-RS resource settings for interference are respectively associated with the CSI resource settings (CSI-ResourceConfig, CSI-ResourceConfigId). The CSI resource settings include a list of CSI-RS resource sets (csi-RS-ResourceSetList, for example, NZP-CSI-RS resource set or CSI-IM resource set).

[0055] If interference measurement is performed in CSI-IM, each CSI-RS resource for channel measurement is associated with the CSI-IM resource in sequence for each resource in the order of the CSI-RS resources and CSI-IM resources within the corresponding resource set. The number of CSI-RS resources for channel measurement is equal to the number of CSI-IM resources.

[0056] That is, for interference measurement based on CSI-IM, the channel measurement resources (CMR) are mapped one-to-one with the interference measurement resources (IMR).

[0057] If the UE is set with a CSI report setting having a report quantity (higher layer parameter reportQuantity) set to 'cri-RSRP', 'cri-RI-PMI-CQI', 'cri-RI-i1', 'cri-RI-i1-CQI', 'cri-RI-CQI', or 'cri-RI-LI-PMI-CQI', and is set with K within the corresponding resource set for channel measurement S (K SIn the case of more than one resource, the UE uses the reported CRI as a condition to derive CSI parameters other than the CRI. CSI k (k≥0) corresponds to the (k+1)-th entry of the NZP-CSI-RS resource (nzp-CSI-RSResource) associated with the corresponding NZP-CSI-RS resource set (nzp-CSI-RS-ResourceSet) for channel measurement, and the (k+1)-th entry of the CSI-IM resource (csi-IM-Resource) associated with the csi-IM-ResourceSet if it is set.

[0058] That is, CSI k corresponds to the (k+1)-th CMR that is set and the (k+1)-th IMR that is set.

[0059] In order to enable more dynamic channel / interference hypotheses for NCJT for both FR1 and FR2, the evaluation and specification of CSI reports for DL transmission using at least one of multiple TRPs and multiple panels are being studied.

[0060] (Multi-TRP)

[0061] In NR, it is being studied that one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP (multi TRP (MTRP))) use one or more panels (multi-panel) to perform DL transmission to the UE. In addition, it is being studied that the UE uses one or more panels to perform UL transmission to one or more TRPs.

[0062] In addition, multiple TRPs can correspond to the same cell identifier (cell Identifier (ID)) or different cell IDs. This cell ID can be either a physical cell ID or a virtual cell ID.

[0063] Figure 2 It is a diagram showing an example of a multi-TRP scenario. In these examples, it is assumed that each TRP and the UE can utilize two different beams, but it is not limited thereto.

[0064] Multiple TRPs (TRP#1, #2) can also be connected via ideal / non-ideal backhaul and exchange information, data, etc. Different codewords (Code Word (CW)) and different layers can also be sent from each TRP of the multiple TRPs. As a way of multi-TRP transmission, Non-Coherent Joint Transmission (NCJT) can also be used.

[0065] In NCJT, for example, TRP1 modulates and maps the first codeword, performs layer mapping, and uses the first precoding for the first number of layers (e.g., two layers) to transmit the first PDSCH. In addition, TRP2 modulates and maps the second codeword, performs layer mapping, and uses the second precoding for the second number of layers (e.g., two layers) to transmit the second PDSCH.

[0066] In addition, multiple PDSCHs (multi-PDSCH) subject to NCJT can also be defined as partially or completely overlapping with respect to at least one of the time domain and the frequency domain. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP can overlap.

[0067] It can also be envisaged that these first PDSCH and second PDSCH are not in a Quasi-Co-Location (QCL) relationship (not quasi-co-located). The reception of multi-PDSCH can also be replaced by the simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0068] The UE receives multiple PDSCHs (which can also be referred to as multiple PDSCH) from multiple TRPs based on one or more DCIs. In addition, in this example, the UE is envisaged to send respective CSI reports (CSI report) related to each TRP for different TRPs. Such CSI feedback can also be referred to as separate feedback, separate CSI feedback, etc. In this disclosure, "separate" can also be interchanged with "independent".

[0069] In addition, CSI feedback that sends a CSI report related to both TRPs to one TRP can also be utilized. Such CSI feedback can also be referred to as joint feedback, joint CSI feedback, etc.

[0070] In Figure 2In this case, the UE is configured to use a certain PUCCH (PUCCH1) to send the CSI report for TRP#1 and use another PUCCH (PUCCH2) to send the CSI report for TRP#2 (separate feedback) for TRP#1. In the case of joint feedback, the UE sends the CSI report for TRP#1 and the CSI report for TRP#2 for either TRP#1 or TRP#2.

[0071] According to such a multi-TRP scenario, more flexible transmission control using a channel with good quality can be performed.

[0072] For multi-TRP transmission, the CSI for multiple different TRPs is usually different. Therefore, it is not clear how to measure and report the CSI for multiple different TRPs. For one TRP, the premise of the channel / interference changes depending on the decision of the transmission of surrounding TRPs (traffic).

[0073] For example, the CSI report for separate feedback (which can also be referred to as a separate CSI report) can also be configured using a CSI report configuration (CSI-ReportConfig) associated with one TRP.

[0074] This CSI report configuration can also correspond to a premise of one interference for one TRP (i.e., different CSI report configurations can be used for each TRP and for each interference premise). This CSI report configuration can also correspond to multiple interference premises for one TRP (i.e., different CSI report configurations can be used for each TRP, and one CSI report configuration can also be associated with multiple interference premises for a certain TRP).

[0075] In addition, for example, the CSI report for joint feedback (which can also be referred to as a joint CSI report) can also be configured using a CSI report configuration (CSI-ReportConfig) associated with multiple TRPs.

[0076] The CSI report configuration can also correspond to interference assumptions for multiple TRPs respectively (i.e., a CSI report including CSI for interference assumption #1 for TRP#1 and CSI for interference assumption #1 for TRP#2 can also be configured using a certain CSI report configuration, and a CSI report including CSI for interference assumption #2 for TRP#1 and CSI for interference assumption #1 for TRP#2 can also be configured using other CSI report configurations). The CSI report configuration can also correspond to multiple interference assumptions for multiple TRPs respectively (i.e., a CSI report including two CSIs for interference assumptions #1 and #2 for TRP#1 and two CSIs for interference assumptions #3 and #4 for TRP#2 can also be configured using a CSI report configuration).

[0077] In addition, the CSI report configuration for joint CSI reporting can also include resource configurations for each TRP (at least one of a resource configuration for channel measurement, a CSI-IM resource configuration for interference, and an NZP-CSI-RS configuration for interference). The resource configuration of a certain TRP can also be configured by being included in a resource configuration group.

[0078] In addition, the resource configuration group can also be identified by the configured resource configuration group index. The resource configuration group can also be interchanged with the report group. The resource configuration group index (which can also be abbreviated as the group index) can also indicate the CSI report associated with the TRP (which TRP a certain CSI report (or CSI report configuration, CSI resource configuration, CSI-RS resource set, CSI-RS resource, TCI state, QCL, etc.) corresponds to). For example, group index #i can correspond to TRP#i.

[0079] The CSI report configuration for individual CSI reporting can also be referred to as an individual CSI report configuration, an individual CSI configuration, etc. The CSI report configuration for joint CSI reporting can also be referred to as a joint CSI report configuration, a joint CSI configuration, etc.

[0080] Preferably, for MTRP, single TRP (STRP) transmission and MTRP transmission are dynamically switched according to the channel state, etc. For this purpose, the following CSIs are required:

[0081] · CSI for TRP1 (the first TRP) assuming STRP transmission (hereinafter, also referred to as CSI_A),

[0082] · CSI for TRP2 (the second TRP) assuming STRP transmission (hereinafter, also referred to as CSI_B),

[0083] · CSI of TRP1 that takes into account the TRP / beam interference from TRP2 and is sent to NCJT assuming MTRP (hereinafter, also referred to as CSI_C),

[0084] · CSI of TRP2 that takes into account the TRP / beam interference from TRP1 and is sent to NCJT assuming MTRP (hereinafter, also referred to as CSI_D).

[0085] CSI_A and CSI_B can be fed back either individually or jointly. On the other hand, regarding CSI_C and CSI_D, if they are fed back individually, there is a concern that the following problems may occur.

[0086] Problem 1 lies in the following point. That is, when the network performs NCJT transmission following the RI and PMI reported by the UE, the total RI from the two TRPs (which can also be interchanged with the number of layers and rank) may exceed the UE capability (for example, the maximum number of supported spatial multiplexing layers for DL reception (e.g., indicated by the RRC parameter "maxNumberMIMO-LayersPDSCH")).

[0087] In this case, it is required that the network obtains appropriate RI and PMI that satisfy the UE capability for NCJT. Alternatively, the UE operation (e.g., dropping the PDSCH of a part of the layers, not decoding, etc.) when the total rank from the MTRP exceeds the above UE capability can also be specified.

[0088] Problem 2 lies in the following point. That is, when the network performs NCJT transmission following the RI / PMI / CQI reported by the UE, the reported TRP interference may not match the actual TRP interference (in other words, the reported CSI is not accurate enough).

[0089] In this case, it is required that the network obtains CSI for NCJT that better matches the channel state.

[0090] In the existing NR specifications, the above problems 1 and 2 cannot be fully addressed. If these cannot be addressed, CSI reporting cannot be properly performed in the case of multiple TRPs, and there is a concern about throughput reduction or communication quality degradation.

[0091] Therefore, the inventors of the present invention have come up with a method for measuring and reporting appropriate CSI in the case of using multiple panels / TRPs.

[0092] Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods related to the respective embodiments can be applied either individually or in combination.

[0093] In the present disclosure, "A / B" and "at least one of A and B" can also be replaced with each other.

[0094] In the present disclosure, panel, uplink (UL) transmission entity, TRP, spatial relationship, control resource set (CORESET), PDSCH, codeword, base station, antenna port of a certain signal (e.g., demodulation reference signal (DMRS) port), antenna port group of a certain signal (e.g., DMRS port group), group for multiplexing (e.g., code division multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CW, redundancy version (RV), layer (MIMO layer, transmission layer, spatial layer) can also be replaced with each other. In addition, panel identifier (ID) and panel can also be replaced with each other. In the present disclosure, TRP ID and TRP can also be replaced with each other.

[0095] In the present disclosure, NCJT, NCJT using multiple TRPs, multiple PDSCHs using NCJT, multiple PDSCHs, multiple PDSCHs from multiple TRPs, etc. can also be replaced with each other. Additionally, multiple PDSCHs can mean multiple PDSCHs with at least a part of time resources (e.g., 1 symbol) overlapping, can also mean multiple PDSCHs with all time resources (e.g., all symbols) overlapping, can also mean multiple PDSCHs with all time resources non - overlapping, can also mean multiple PDSCHs carrying the same TB or the same CW, and can also mean multiple PDSCHs to which different UE beams (spatial domain reception filters, QCL parameters) are applied.

[0096] In the present disclosure, cell, CC, carrier, BWP, band can also be replaced with each other.

[0097] In the present disclosure, index, ID, indicator, resource ID, etc. can also be replaced with each other. In the present disclosure, beam, TCI, TCI state, DL TCI state, UL TCI state, unified TCI state, QCL, QCL assumption, spatial relationship, spatial relationship information, precoder, etc. can also be replaced with each other.

[0098] In the present disclosure, list, group, set (collection), subset, cluster, etc. can also be replaced with each other.

[0099] In the present disclosure, the TRP index, CORESET pool index (CORESETPoolIndex), pool index, group index, CSI report setting group index, CSI report group index, CSI report setting index, CSI report setting group index, resource setting group index may also be replaced with each other.

[0100] In the present disclosure, the resource setting for channel measurement, the resource for channel measurement, resourcesForChannelMeasurement may also be replaced with each other. In the present disclosure, the CSI-IM resource setting for interference, the resource for interference measurement based on CSI-IM (CSI-IM based), csi-IM-ResourceForInterference, the resource for interference measurement may also be replaced with each other. In the present disclosure, the NZP-CSI-RS resource setting for interference, the resource for interference measurement based on NZP-CSI-RS (NZP-CSI-RS based), nzp-CSI-RS-ResourcesForInterference, the resource for interference measurement may also be replaced with each other.

[0101] In the present disclosure, CSI report, CSI report setting, CSI setting, resource setting, etc. may also be replaced with each other.

[0102] (Wireless communication method)

[0103] <First Embodiment>

[0104] The first embodiment is an embodiment that particularly addresses the above-mentioned problem 1.

[0105] The UE may also be configured with a CSI report setting for individual CSI reports (individual CSI report setting) and a CSI report setting for joint CSI reports (joint CSI report setting) simultaneously. Additionally, the UE may be configured only with a CSI report setting for individual CSI reports or only with a CSI report setting for joint CSI reports.

[0106] In addition, individual CSI reports may also be used to report at least one of the above-mentioned CSI_A and CSI_B. Joint CSI reports may also be used to report at least one of the above-mentioned CSI_A and CSI_B.

[0107] The joint CSI report may also include a plurality of CSIs, the plurality of CSIs including a first CSI for a first TRP and a second CSI for a second TRP. The UE may also be assumed that the first rank represented by the first CSI (RI) and the second rank represented by the second CSI (RI) satisfy at least one of the following (are restricted by at least one of the following):

[0108] (1) The sum of the first rank and the second rank does not exceed the rank indicated by the UE capability.

[0109] (2) The first rank and the second rank do not exceed the value obtained by dividing the maximum number of spatial multiplexing layers to be supported by N (for example, N is the number of configured TRPs, the number of CORESET pools, etc.).

[0110] (3) The first rank and the second rank do not exceed the values based on higher layer signaling (e.g., RRC, MAC CE, etc.).

[0111] The UE capability in (1) above can also be the capability of the maximum number of spatial multiplexing layers supported for DL reception in Rel.15 NR (maxNumberMIMO-LayersPDSCH). In addition, in the case where the capability of the maximum number of spatial multiplexing layers supported for DL reception is defined for each TRP (e.g., it can also be indicated by the RRC parameter "maxNumberMIMO-LayersPDSCHperTRP"), the "rank indicated by the UE capability" in (1) above can also be replaced by the rank indicated by the capability of the maximum number of spatial multiplexing layers supported for DL reception for each TRP × N (N is the same as in (2) above).

[0112] Regarding (2) above, in the case where the capability of the maximum number of spatial multiplexing layers supported for DL reception is defined for each TRP, the "value obtained by dividing the maximum number of spatial multiplexing layers to be supported by N" in (1) above can also be replaced by the maximum number of spatial multiplexing layers supported for DL reception for each TRP.

[0113] Regarding (3) above, the value based on higher layer signaling can be either a value of the maximum rank allowed to be reported that is common among multiple CSIs (multiple TRPs) in the CSI report (i.e., different values are referred to for the first rank and the second rank), or a set of the maximum ranks allowed to be reported for each of multiple CSIs (TRPs) (different values are referred to for the first rank and the second rank).

[0114] Figure 3 It is a diagram showing an example of the CSI report setting related to the first embodiment. In this example, the UE is simultaneously configured with CSI report settings #1 and #2 related to individual CSI reports and CSI report setting #3 related to joint CSI reports.

[0115] For example, CSI report configuration #1 can also correspond to CSI_A for TRP1, and CSI report configuration #2 can also correspond to CSI_B for TRP2. CSI report configuration #3 can also correspond to CSI_C and CSI_D for MTRP. Additionally, the CSI_C and CSI_D comply with at least one of the above (1)-(3) restrictions.

[0116] [Whether the CSI report configuration is used alone or jointly]

[0117] Regarding whether the CSI report configuration is a single CSI configuration or a joint CSI configuration (which can also be referred to as CSI feedback type indication), it can also be explicitly configured by higher layer signaling (e.g., RRC parameters). Figure 4 It is a diagram showing an example of an RRC parameter representing the CSI feedback type indication. In this example, the CSI report configuration (CSI-ReportConfig) includes at least the RRC parameter representing the CSI feedback type indication.

[0118] In the case where the CSI report configuration does not include the CSI feedback type indication, the UE can also assume that the default feedback type is used for this CSI report configuration. The default feedback type can be either a single CSI configuration or a joint CSI configuration, or it can also be determined based on other parameters within the CSI report configuration as described later.

[0119] Regarding whether the CSI report configuration is a single CSI configuration or a joint CSI configuration, it can also be implicitly notified by other RRC parameters.

[0120] For example, in a case where Figure 1 at most one CMR (resourcesForChannelMeasurement), at most one ZP-IMR (csi-IM-ResourcesForInterference), and at most one NZP-IMR (nzp-CSI-RS-ResourcesForInterference) are included in the CSI report configuration, the UE can also determine that this CSI report configuration is a single CSI configuration. The UE can also assume that the CSI report based on this CSI report configuration includes only one CSI.

[0121] In a case where Figure 5When at least any one of a plurality of CMRs (resourcesForChannelMeasurement), a plurality of ZP-IMRs (csi-IM-ResourcesForInterference), and a plurality of NZP-IMRs (nzp-CSI-RS-ResourcesForInterference) is included in a CSI report setting, the UE may also determine that the CSI report setting is a joint CSI setting. The UE may also assume that the CSI report based on the CSI report setting includes a plurality of CSIs.

[0122] In addition, as Figure 5 shown, a set of CMR, ZP-IMR, and NZP-IMR may also be set for each TRP. Different multiple sets may also be set in association with different resource setting groups respectively.

[0123] According to the first embodiment described above, for example, the UE can use a joint CSI report to report a plurality of RIs suitable for NCJT transmission.

[0124] <Second Embodiment>

[0125] The second embodiment is an embodiment specifically corresponding to the above-mentioned problem 2.

[0126] In the second embodiment, for a joint CSI report, the CMR for a certain CSI (TRP) is equivalent to the IMR for another CSI (TRP). According to this structure, it is expected that the two CSIs included in the joint CSI report for NCJT transmission match the actual inter-TRP interference well (accurate enough for direct scheduling). In addition, it is not required to further update the CSI through the network.

[0127] [Explicit IMR Setting]

[0128] The UE may also assume that for a certain CSI report setting, the CMR of one resource setting group (the resource specified by resourcesForChannelMeasurement) is included in the NZP-IMR (the resource specified by nzp-CSI-RS-ResourcesForInterference) (or the same) of another resource setting group.

[0129] Figure 6 is a diagram showing an example of the CSI report setting related to the second embodiment. Figure 6 Similar to Figure 5 , thus, no repeated description will be given.

[0130] In this example, it is shown that when the SSB / CSI-RS ID = X (X is an integer, for example) is set for the CMR for TRP#1 (or resource setting group #1), the same SSB / CSI-RS ID = X is set for the NZP-IMR for TRP#2 (or resource setting group #2).

[0131] Furthermore, in this example, it is shown that when the SSB / CSI-RS ID = Y (Y is an integer, for example) is set for the CMR for TRP#2, the same SSB / CSI-RS ID = Y is set for the NZP-IMR for TRP#1.

[0132] In addition, as Figure 6 shown, the ZP-IMR can also be set individually for each TRP.

[0133] Figure 7 FIG. is a diagram showing an example of the CSI report setting according to the second embodiment. Figure 7 Similar to Figure 6 this, a repeated description will not be given. Figure 7 Different from Figure 6 this is that the ZP-IMR is set commonly (in a shared manner) for the two TRPs.

[0134] In addition, when multiple SSB / CSI-RS IDs (multiple CMRs are set) are set as the CMR for TRP#1 (#2), multiple SSB / CSI-RS IDs can also be set in the same order as the NZP-IMR for TRP#2 (#1). For example, the i-th list / ID / set of the CMR for a certain TRP can also be mapped to the i-th list / ID / set of the IMR for the other TRP.

[0135] In addition, the mapping (corresponding relationship) between the list / ID / set of the CMR for a certain TRP and the i-th list / ID / set of the IMR for the other TRP can be set by higher layer signaling or can be predetermined by the specification.

[0136] [Implicit IMR Setting]

[0137] The UE can also assume that there is no explicit IMR setting for inter-TRP interference for a certain CSI report setting (joint CSI setting). In this case, the specification can also stipulate the assumption of the additional IMR when the joint CSI setting is set.

[0138] For example, in the joint CSI setting, it can also be conceived that, based on or instead of the explicit ZP-IMR / NZP-IMR, the CMR (resources specified by resourcesForChannelMeasurement) for a certain TRP is included in the additional NZP-IMR (or the same) for other TRPs. Here, the additional NZP-IMR for the other TRP is not explicitly set.

[0139] The information related to the additional NZP-IMR can either be predetermined by the specification or be notified to the UE using at least one of RRC, MAC CE, and DCI.

[0140] Figure 8 It is a diagram showing an example of the CSI report setting related to the second embodiment. Figure 8 Similar to Figure 6 so, duplicate explanations will not be given. Figure 8 Similar to Figure 6 The difference from

[0141] is that the NZP-IMR for TRP#1 is not explicitly set with SSB / CSI-RS ID = Y, and the NZP-IMR for TRP#2 is not explicitly set with SSB / CSI-RS ID = X.

[0142] Figure 9 It is a diagram showing an example of the CSI report setting related to the second embodiment. Figure 9 Similar to Figure 8 so, duplicate explanations will not be given. Figure 9 Similar to Figure 8 the difference is that the ZP-IMR and NZP-IMR are set commonly (in a shared manner) in the two TRPs.

[0143] The UE can also use the commonly set NZP-IMR and the SSB / CSI-RS ID = Y equivalent to the CMR of TRP#2 as the NZP-IMR of TRP#1. The UE can also use the commonly set NZP-IMR and the SSB / CSI-RS ID = X equivalent to the CMR of TRP#1 as the NZP-IMR of TRP#2.

[0144] According to the second embodiment described above, for example, the UE can use a joint CSI report to report CSI for NCJT transmission that appropriately takes into account the interference between TRPs.

[0145] (Wireless communication system)

[0146] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure.

[0147] Figure 10 FIG. is an example showing a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5G NR), or the like.

[0148] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0149] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0150] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (e.g., dual connectivity (NR-NR dual connectivity (NN-DC))) where both the MN and the SN are base stations (gNBs) of NR).

[0151] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is configured within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration, number, etc. of each cell and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0152] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of carrier aggregation (CA) and dual connectivity (DC) that uses multiple component carriers (CCs).

[0153] 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). Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these. For example, FR1 may correspond to a frequency band higher than FR2.

[0154] Furthermore, the user terminal 20 may communicate in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0155] Multiple base stations 10 can also be connected via wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is utilized as a backhaul between base stations 11 and 12, the base station 11 equivalent to the upper station can also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to the relay station (relay) can also be referred to as an IAB node.

[0156] Base stations 10 can also be connected to the core network 30 via other base stations 10 or directly. The core network 30 can also include, for example, at least one of an Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0157] The user terminal 20 can also be a terminal that supports at least one of communication methods such as LTE, LTE-A, 5G, etc.

[0158] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also be utilized. For example, in at least one of the Downlink (DL) and Uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. can also be utilized.

[0159] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, in the wireless access methods of UL and DL, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used.

[0160] As a downlink channel, in the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc., which are shared among the respective user terminals 20, can also be used.

[0161] In addition, as an uplink channel, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc., which are shared among the respective user terminals 20, can also be used.

[0162] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through the PDSCH. User data, high-layer control information, etc. can also be transmitted through the PUSCH. In addition, the Master Information Block (MIB) can also be transmitted through the PBCH.

[0163] Low-layer control information can also be transmitted through the PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and the downlink control information includes scheduling information for at least one of the PDSCH and the PUSCH.

[0164] In addition, the DCI that schedules the PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH can also be replaced with DL data, and the PUSCH can also be replaced with UL data.

[0165] In the detection of PDCCH, a control resource set (CORESET) and a search space can also be utilized. A CORESET corresponds to the resource for searching DCI. A search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space configuration.

[0166] A search space can also correspond to PDCCH candidates equivalent to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. Additionally, in the present disclosure, terms such as "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. can be used interchangeably.

[0167] Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (such as hybrid automatic repeat request acknowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted through PUCCH. A random access preamble for establishing a connection with a cell can also be transmitted through PRACH.

[0168] In addition, in the present disclosure, the downlink, uplink, etc. can also be expressed without "link". Furthermore, it can also be expressed without "Physical" at the beginning of various channels.

[0169] In the wireless communication system 1, it is also possible to transmit a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. As the DL-RS, in the wireless communication system 1, it is also possible to transmit a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc.

[0170] The synchronization signal can also be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0171] Furthermore, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), it is also possible to transmit a reference signal for measurement (sounding reference signal (Sounding Reference Signal (SRS))), a demodulation reference signal (DMRS), etc. In addition, DMRS may also be referred to as a user terminal-specific reference signal (UE-specific Reference Signal).

[0172] (Base station)

[0173] Figure 11FIG. 0 is a diagram showing an example of the structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission path interface (transmission line interface) 140. In addition, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

[0174] In addition, in this example, functional blocks of the characteristic parts in the present embodiment are mainly shown, and it can be assumed that the base station 10 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0175] The control unit 110 implements overall control of the base station 10. The control unit 110 can be constituted by a controller, a control circuit, etc. that can be described based on common knowledge in the technical field related to the present disclosure.

[0176] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission / reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequence, etc. to be transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 may also perform call processing (setting, releasing, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0177] The transmission / reception 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 transmission / reception unit 120 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. that can be described based on common knowledge in the technical field related to the present disclosure.

[0178] The transmission / reception unit 120 may be constituted as an integrated transmission / reception unit, or may be constituted by a transmission unit and a reception unit. The transmission unit may be constituted by the transmission processing unit 1211 and the RF unit 122. The reception unit may be constituted by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0179] The transmission / reception antenna 130 can be constituted by an antenna that can be described based on common knowledge in the technical field related to the present disclosure, such as an array antenna or the like.

[0180] The transmission / reception unit 120 can also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 120 can also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0181] The transmission / reception unit 120 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0182] The transmission / reception unit 120 (transmission processing unit 1211) can also perform, for example, processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0183] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing (filtering), Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0184] The transmission / reception unit 120 (RF unit 122) can also modulate the baseband signal to a radio frequency band, perform filter processing, amplification, etc., and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0185] On the other hand, the transmission / reception unit 120 (RF unit 122) can also amplify, perform filter processing, demodulate to a baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0186] The transmission / reception unit 120 (reception processing unit 1212) may also apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as required), filter processing, 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 and the like.

[0187] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also perform measurements on received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0188] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30, other base stations 10, etc., and may also acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0189] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0190] In addition, the transmission / reception unit 120 may also send setting information for a joint CSI report including first Channel State Information (CSI) and second CSI to the user terminal 20.

[0191] The control unit 110 may also receive the joint CSI report that is assumed to be generated by the terminal under certain constraints on the first rank represented by the first CSI and the second rank represented by the second CSI.

[0192] (User Terminal)

[0193] Figure 12 FIG. is an example showing the structure of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0194] In addition, in this example, mainly the functional blocks of the characteristic parts in this embodiment are shown, and it may be assumed that the user terminal 20 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0195] The control unit 210 implements overall control of the user terminal 20. The control unit 210 may be composed of a controller, a control circuit, etc. that can be explained based on the common knowledge in the technical field related to the present disclosure.

[0196] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission / reception unit 220.

[0197] The transmission / reception 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 transmission / reception unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. that can be explained based on the common knowledge in the technical field related to the present disclosure.

[0198] The transmission / reception unit 220 can be configured as an integrated transmission / reception unit, or can be composed of a transmission unit and a reception unit. The transmission unit can also be composed of a transmission processing unit 2211 and an RF unit 222. The reception unit can also be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0199] The transmission / reception antenna 230 can be composed of an antenna described based on common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0200] The transmission / reception unit 220 can also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 can also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0201] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0202] The transmission / reception unit 220 (transmission processing unit 2211) can also perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0203] The transmission / reception unit 220 (transmission processing unit 2211) can also perform transmission processing such as channel coding (which can include error correction coding), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0204] In addition, regarding whether to apply DFT processing, it can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is effective (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform. In other cases, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-mentioned transmission processing.

[0205] The transmission / reception unit 220 (RF unit 222) can also perform modulation to the radio frequency band, filter processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0206] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filtering, demodulation to baseband signals, etc. on the signals in the radio frequency band received through the transmission / reception antenna 230.

[0207] The transmission / reception unit 220 (reception processing unit 2212) can also perform 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 on the obtained baseband signal, and obtain user data, etc.

[0208] The transmission / reception unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 can also measure received power (e.g., RSRP), reception quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 210.

[0209] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure can also be composed of at least one of the transmission / reception unit 220, the transmission / reception antenna 230, and the transmission path interface 240.

[0210] In addition, the control unit 210 can also assume that there are certain restrictions on the first rank represented by the first channel state information (Channel State Information (CSI)) and the second rank represented by the second CSI, and control the creation (generation) of the joint CSI report including the first CSI and the second CSI.

[0211] The transmission / reception unit 220 can also transmit the joint CSI report.

[0212] The control unit 210 can also assume that the total rank of the first rank and the second rank does not exceed the rank represented by the UE capability.

[0213] In the case of a CSI report setting that includes information indicating a joint CSI report (CSI feedback type indication indicating a joint CSI report) or a CSI report setting that does not indicate a separate CSI report, the control unit 210 can also control the creation of the joint CSI report.

[0214] The control unit 210 may also be conceived such that the channel measurement resource (CMR) for the first CSI serves as the interference measurement resource (IMR, e.g., at least one of NZP-IMR and ZP-IMR) for the second CSI, and controls the generation of the joint CSI report.

[0215] (Hardware Structure)

[0216] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Furthermore, the implementation method of each functional block is not particularly limited. That is, each functional block may be implemented by a single device physically or logically combined, or may be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected with these multiple devices. The functional block may also be implemented by combining the above single device or the above multiple devices with software.

[0217] Here, in terms of functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, conception, expectation, regarded as, broadcasting, notification, communication, forwarding, constitution (configuration), reconstitution (reconfiguration), allocation (mapping), assignment, etc., but not limited to these. For example, the functional block (structural unit) that implements the transmission function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0218] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 13 FIG. is an example of a hardware structure of a base station and a user terminal according to an embodiment. The above base station 10 and user terminal 20 may also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0219] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be replaced with each other. The hardware structures of the base station 10 and the user terminal 20 can be configured to include one or more of each device shown in the figure, or can be configured not to include some devices.

[0220] For example, only one processor 1001 is illustrated, but there can also be multiple processors. In addition, the processing can be executed by one processor, or can be executed simultaneously, sequentially, or by other means by two or more processors. Additionally, the processor 1001 can also be implemented by one or more chips.

[0221] Regarding each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003, thereby implementing the function.

[0222] The processor 1001, for example, operates the operating system to control the entire computer. The processor 1001 can also be composed of a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, at least a part of the above control unit 110 (210), transmission / reception unit 120 (220), etc. can also be implemented by the processor 1001.

[0223] Furthermore, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes based on them. As the program, a program that causes the computer to execute at least a part of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operating in the processor 1001, and the same can be applied to other functional blocks.

[0224] The memory 1002 may also be a computer-readable recording medium, which is constituted by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), and other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), a software module, etc. that can be executed to implement the wireless communication method according to an embodiment of the present disclosure.

[0225] The storage 1003 may also be a computer-readable recording medium, which is constituted by at least one of, for example, a flexible disc, a floppy (registered trademark) disc, an optical disc (such as a compact disc (compact disc read-only memory (CD-ROM)), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc, a removable disc, a hard disk drive, a smart card, a flash device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0226] The communication device 1004 is hardware (a transmitting and receiving device) for performing communication 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, a communication module, etc. In order to implement at least one of, for example, frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-described transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated and implemented by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0227] The input device 1005 is an input device that accepts input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that performs output to the outside (e.g., display, speaker, Light Emitting Diode (LED) lamp, etc.). Additionally, the input device 1005 and the output device 1006 may also be integrated (e.g., touch panel).

[0228] 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 constituted by a single bus or may be constituted by different buses between each device.

[0229] In addition, the base station 10 and the user terminal 20 may also 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), a Field Programmable Gate Array (FPGA), etc., and part or all of each functional block may be implemented by this hardware. For example, the processor 1001 may also be implemented using at least one of these hardwares.

[0230] (Variant example)

[0231] Also, regarding the terms described in this disclosure and the terms required for understanding this disclosure, they may also be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may also be replaced with each other. Additionally, a signal may also be a message. A Reference Signal can also be abbreviated as RS and may also be referred to as a Pilot, a pilot signal, etc. according to the applied standard. Furthermore, a Component Carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0232] A radio frame may also be constituted by one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be constituted by one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) independent of numerology.

[0233] Here, the parameter set may also refer to communication parameters applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering process performed by the transmitter-receiver in the frequency domain, specific windowing process performed by the transmitter-receiver in the time domain, etc.

[0234] A time slot may also be composed of one or more symbols (orthogonal frequency division multiplexing (OFDM) symbols, single carrier frequency division multiple access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on the parameter set.

[0235] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as PDSCH (PUSCH) mapping type B.

[0236] A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol all represent time units for transmitting signals. A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol may also use their respective other names. In addition, the time units such as frames, sub-frames, time slots, mini-slots, symbols, etc. in the present disclosure may also be replaced with each other.

[0237] For example, a sub-frame may also be referred to as a TTI, multiple consecutive sub-frames may also be referred to as a TTI, and a time slot or a mini-slot may also be referred to as a TTI. That is, at least one of a sub-frame and a TTI may be a sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (e.g., 1 - 13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may not be referred to as a sub-frame, but as a time slot, a mini-slot, etc.

[0238] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each user terminal) to each user terminal in units of TTI. Additionally, the definition of the TTI is not limited to this.

[0239] The TTI can also be the transmission time unit for data packets (transport blocks), code blocks, codewords, etc. that have undergone channel coding, and can also be the processing unit for scheduling, link adaptation, etc. Additionally, when the TTI is given, the time interval (e.g., the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped can also be shorter than the TTI.

[0240] Additionally, when one time slot or one mini - time slot is referred to as the TTI, one or more TTIs (i.e., one or more time slots or one or more mini - time slots) can also be the minimum time unit for scheduling. Furthermore, the number of time slots (mini - time slot numbers) that make up the minimum time unit of this scheduling can also be controlled.

[0241] The TTI with a time length of 1 ms can also be referred to as the normal TTI (TTI in 3GPP Rel.8 - 12), standard TTI, long TTI, normal sub - frame, standard sub - frame, long sub - frame, time slot, etc. The TTI shorter than the normal TTI can also be referred to as the shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened sub - frame, short sub - frame, mini - time slot, sub - time slot, time slot, etc.

[0242] Additionally, the long TTI (e.g., normal TTI, sub - frame, etc.) can also be replaced with a TTI having a time length exceeding 1 ms, and the short TTI (e.g., shortened TTI, etc.) can also be replaced with a TTI having a TTI length less than the long TTI and a TTI length of 1 ms or more.

[0243] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and can also include one or more consecutive sub - carriers (sub - carriers) in the frequency domain. The number of sub - carriers included in the RB can be the same regardless of the parameter set, for example, it can be 12. The number of sub - carriers included in the RB can also be determined based on the parameter set.

[0244] Furthermore, the RB can also include one or more symbols in the time domain, and can also be the length of one time slot, one mini - time slot, one sub - frame, or one TTI. One TTI, one sub - frame, etc. can also be composed of one or more resource blocks respectively.

[0245] In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0246] Furthermore, a resource block may also be composed of one or more Resource Elements (REs). For example, one RE may also be a wireless resource area of a subcarrier and a symbol.

[0247] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used for a certain parameter set in a certain carrier. Here, the common RBs may also be determined by the indexes of the RBs based on the common reference point of the carrier. A PRB may also be defined in a certain BWP and be numbered additionally within that BWP.

[0248] A BWP may also include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may also be set within a carrier.

[0249] At least one of the set BWPs may also be active, and the UE may not assume to transmit and receive specific signals / channels outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced with "BWP".

[0250] In addition, the structures such as the above-mentioned radio frames, subframes, time slots, mini time slots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini time slots included in a time slot, the symbols and the number of RBs included in a time slot or mini time slot, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0251] Furthermore, the information, parameters, etc. described in the present disclosure may be represented by absolute values, may also be represented by relative values with respect to a specific value, and may also be represented by corresponding other information. For example, a radio resource may also be indicated by a specific index.

[0252] In the present disclosure, the names used for parameters and the like are not restrictive names in all aspects. Furthermore, mathematical formulas and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. Various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name. Therefore, the various names assigned to these various channels and information elements are not restrictive names in all aspects.

[0253] The information, signals, etc. described in the present disclosure can also be represented using any one of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0254] In addition, information, signals, etc. can be output in at least one of the following directions: from the higher layer (upper layer) to the lower layer (lower layer), and from the lower layer to the higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0255] The information, signals, etc. input and output can be stored in a specific location (e.g., a memory), or can be managed using a management table. The information, signals, etc. input and output can be overwritten, updated, or appended. The information, signals, etc. output can also be deleted. The information, signals, etc. input can also be sent to other devices.

[0256] The notification of information is not limited to the methods / embodiments described in the present disclosure, and other methods can also be used. For example, the notification of information in the present disclosure can also be implemented by physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0257] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, for example, it may also be an RRC connection setup message, an RRC connection reconfiguration (RRC connection reset (RRCConnection Reconfiguration)) message, etc. In addition, MAC signaling may also be notified, for example, using a MAC control element (MAC Control Element (CE)).

[0258] In addition, the notification of specific information (for example, the notification of "is X") is not limited to explicit notification, and may also be performed implicitly (for example, by not performing the notification of the specific information, or by the notification of other information).

[0259] The determination can be made by a value represented by one bit (0 or 1), can also be made by a true / false value (Boolean value) represented by true or false, and can also be made by a numerical comparison (for example, comparison with a specific value).

[0260] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, processes, functions, etc.

[0261] In addition, software, instructions, information, etc. can also be sent and received via a transmission medium. For example, in the case of using at least one of wired technologies (coaxial cables, fiber optic cables, twisted pairs, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared rays, microwaves, etc.) to send software from a website, server, or other remote source, at least one of these wired technologies and wireless technologies is included in the definition of the transmission medium.

[0262] In the present disclosure, terms such as "system" and "network" can be used interchangeably. A "network" can also mean a device (e.g., a base station) included in the network.

[0263] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. can be used interchangeably.

[0264] In the present disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. can be used interchangeably. There are also cases where base stations are referred to using terms such as macro cell, small cell, femto cell, pico cell, etc.

[0265] The base station can accommodate one or more (e.g., three) cells. In the case where the base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within the coverage range.

[0266] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0267] There are also cases where the mobile station is referred to by subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other appropriate terms.

[0268] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station can be a device mounted on a moving body, the moving body itself, etc. The moving body can be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0269] In addition, the base station in the present disclosure can also be replaced by a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced by communication between multiple user terminals (for example, it can also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various methods / embodiments of the present disclosure can also be applied. In this case, it can also be configured such that the user terminal 20 has the functions of the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. can also be replaced by a side channel.

[0270] Similarly, the user terminal in the present disclosure can also be replaced by a base station. In this case, it can also be configured such that the base station 10 has the functions of the above-mentioned user terminal 20.

[0271] In the present disclosure, an action performed by a base station may sometimes be performed by its upper node according to circumstances. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0272] The various methods / embodiments described in the present disclosure can be used alone, in combination, or switched during execution. In addition, the processing procedures, sequences, flowcharts, etc. of the various methods / embodiments described in the present disclosure can also be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, elements of various steps are presented in an exemplary order, but are not limited to the specific order presented.

[0273] Each mode / embodiment described in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, the fourth generation mobile communication system (4G), the fifth generation mobile communication system (5G), the sixth generation mobile communication system (6G), the xth generation mobile communication system (xG) (x is an integer or a decimal, for example), 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 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended based on them, etc. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G) for application.

[0274] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0275] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not comprehensively define the quantity or order of these elements. These terms can be used in this disclosure as a convenient method for distinguishing between more than two elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted, or that the first element must be prior to the second element in a certain form.

[0276] The term "determining" used in this disclosure may cover a variety of actions in some cases. For example, "determining" may also be a case where judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiry in, for example, a table, database or other data structure), ascertaining, etc. are regarded as performing "determining".

[0277] In addition, "determining" may also be a case where receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing data in a memory), etc. are regarded as performing "determining".

[0278] In addition, "determining" may also be a case where resolving, selecting, choosing, establishing, comparing, etc. are regarded as performing "determining". That is, "determining" may also be a case where some actions are regarded as performing "determining".

[0279] In addition, "determining" may also be replaced by "assuming", "expecting", "considering", etc.

[0280] The "maximum transmit power" described in this disclosure may either mean the maximum value of the transmit power, or the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0281] As used in this disclosure, the terms "connected" and "coupled", or any variations thereof, mean all direct or indirect connections or couplings between two or more elements, and can include the situation where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination of them. For example, "connected" can also be replaced by "access".

[0282] In this disclosure, when two elements are connected, it is possible to consider using one or more wires, cables, printed electrical connections, etc., and electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, optical (both visible and invisible) region, etc., as several non-limiting and non-inclusive examples, and being "connected" or "coupled" to each other.

[0283] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other". Additionally, this term can also mean "A and B are each different from C". Terms such as "separated" and "combined" can be interpreted in the same way as "different".

[0284] When the terms "include", "including", and their variations are used in this disclosure, these terms, like the term "comprising", are meant in an inclusive sense. Furthermore, the term "or" used in this disclosure does not mean the exclusive or.

[0285] In this disclosure, for example, in the case where articles are added through translation such as a, an, and the in English, this disclosure can also include the case where the nouns following these articles are in the plural form.

[0286] Above, the invention related to this disclosure has been described in detail, but for those skilled in the art, the invention related to this disclosure is obviously not limited to the embodiments described in this disclosure. The invention related to this disclosure can be implemented in the form of modifications and changes without departing from the gist and scope of the invention determined based on the claims. Therefore, the description of this disclosure is for the purpose of illustration and does not carry any restrictive meaning for the invention related to this disclosure.

Claims

1. A terminal, comprising: a control unit that controls the transmission of capability information indicating a first maximum number of layers for each of a plurality of physical downlink shared channels (PDSCHs) transmitted from each of a plurality of transmission and reception points (TRPs), and a second maximum number of layers for the sum of the plurality of PDSCHs; and a receiving unit that receives the plurality of PDSCHs, wherein the control unit controls the reporting of a channel state information (CSI) for the plurality of TRPs, the CSI indicating a first rank and a second rank determined based on a set of ranks of higher layer signaling.

2. A wireless communication method, which is a wireless communication method of a terminal, comprising: a step of controlling the transmission of capability information indicating a first maximum number of layers for each of a plurality of physical downlink shared channels (PDSCHs) transmitted from each of a plurality of transmission and reception points (TRPs), and a second maximum number of layers for the sum of the plurality of PDSCHs; a step of receiving the plurality of PDSCHs; and a step of controlling the reporting of a channel state information (CSI) for the plurality of TRPs, the CSI indicating a first rank and a second rank determined based on a set of ranks of higher layer signaling.

3. A base station, comprising: a control unit that controls the reception of capability information indicating a first maximum number of layers for each of a plurality of physical downlink shared channels (PDSCHs) transmitted from each of a plurality of transmission and reception points (TRPs), and a second maximum number of layers for the sum of the plurality of PDSCHs; and a transmitting unit that transmits the plurality of PDSCHs, wherein the control unit controls the reception of a channel state information (CSI) for the plurality of TRPs, the CSI indicating a first rank and a second rank determined based on a set of ranks of higher layer signaling.

4. A system including a terminal and a base station, wherein the terminal comprises: a control unit that controls the transmission of capability information indicating a first maximum number of layers for each of a plurality of physical downlink shared channels (PDSCHs) transmitted from each of a plurality of transmission and reception points (TRPs), and a second maximum number of layers for the sum of the plurality of PDSCHs; and a receiving unit that receives the plurality of PDSCHs, wherein the base station comprises a transmitting unit that transmits the plurality of PDSCHs, and the control unit of the terminal controls the reporting of a channel state information (CSI) for the plurality of TRPs, the CSI indicating a first rank and a second rank determined based on a set of ranks of higher layer signaling.

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