Terminal, wireless communication method, base station and system

Abstract

A terminal according to an aspect of the present disclosure comprises: a reception unit for receiving a setting of a beam group type indicating at least one of whether a plurality of beams in a beam group are related to different spatial domain reception filters, whether the plurality of beams are used for spatial multiplexing or spatial diversity, and a maximum number of layers for each downlink reference signal in the beam group; and a control unit for controlling implementation of beam measurement and reporting of a beam group type on the basis of the setting. According to an aspect of the present disclosure, a beam group type in a group based beam report can be appropriately set or reported.

Description

Terminal, wireless communication method and base station

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

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

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered.

[0004] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

[0005] In Rel. 17 and later, in group-based beam reporting, it is being considered that the beam group type be set by the base station or reported by the UE.

[0006] However, the configuration / reporting in group-based beam reporting has not yet been sufficiently studied. If these studies are not sufficient, appropriate communication between the TRP and the UE may not be performed, and communication throughput may be reduced.

[0007] One of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately set / report beam group types in group-based beam reporting.

[0008] A terminal according to one aspect of the present disclosure has a receiving unit that receives a beam group type setting that indicates at least one of whether multiple beams in a beam group are associated with different spatial domain receive filters, whether the multiple beams are used for spatial multiplexing or spatial diversity, and the maximum number of layers per downlink reference signal in the beam group, and a control unit that controls the performance of beam measurements and the reporting of the beam group type based on the setting.

[0009] According to one aspect of the present disclosure, beam group types in group-based beam reporting can be appropriately set / reported.

[0010] Figures 1A and 1B are diagrams illustrating an example of RRC information elements related to CSI reporting configuration and CSI resource configuration. Figures 2A and 2B are diagrams illustrating an example of RRC information elements related to NZP CSI-RS resource sets and CSI-SSB resource sets. Figure 3 is a diagram illustrating an example of RRC information elements related to TCI states. Figure 4 is an excerpt of the RRC information element "CSI-ReportConfig." Figure 5 is a diagram illustrating an example of a CSI report in Rel. 15 NR. Figure 6 is a diagram illustrating an example of a beam usage environment assumed for multiple group-based beam reporting. Figure 7 is a diagram illustrating an example of a CSI report for Mode 1 of multiple group-based beam reporting. Figure 8 is a diagram illustrating an example of a CSI report for Mode 2 of multiple group-based beam reporting. Figure 9 is a diagram illustrating an example of beam group type configuration / reporting according to the first embodiment. Figure 10 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. Figure 11 is a diagram illustrating an example of a configuration of a base station according to an embodiment. Figure 12 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. Fig. 13 is a diagram illustrating an example of a hardware configuration of a base station and a user terminal according to an embodiment. Fig. 14 is a diagram illustrating an example of a vehicle according to an embodiment.

[0011] (CSI) In NR, the UE measures the channel state using a reference signal (or a resource for the reference signal) and feeds back (reports) channel state information (CSI) to the network (e.g., a base station).

[0012] The UE may measure the channel state using at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), a Demodulation Reference Signal (DMRS), etc.

[0013] The CSI-RS resource may include at least one of a Non Zero Power (NZP) CSI-RS resource, a Zero Power (ZP) CSI-RS resource, and a CSI Interference Measurement (CSI-IM) resource.

[0014] Resources for measuring signal components for CSI may be referred to as signal measurement resources (SMR) or channel measurement resources (CMR). The SMR (CMR) may include, for example, NZP CSI-RS resources, SSBs, etc. for channel measurement.

[0015] A resource for measuring interference components for CSI may be referred to as an interference measurement resource (IMR). The IMR may include, for example, at least one of an NZP CSI-RS resource, an SSB, a ZP CSI-RS resource, and a CSI-IM resource for interference measurement.

[0016] An SS / PBCH block is a block that includes a synchronization signal (e.g., a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS)) and a PBCH (and corresponding DMRS), and may also be referred to as an SS block (SSB).

[0017] The CSI may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), L1-SNR (Signal to Noise Ratio), and the like.

[0018] The CSI may have multiple parts: CSI Part 1 may include information with a relatively small number of bits (e.g., RI), and CSI Part 2 may include information with a relatively large number of bits (e.g., CQI), such as information determined based on CSI Part 1.

[0019] Furthermore, CSI may be classified into several CSI types. The type and size of information to be reported may differ depending on the CSI type. For example, a CSI type set for communication using a single beam (also referred to as type I CSI, single-beam CSI, etc.) and a CSI type set for communication using multiple beams (also referred to as type II CSI, multi-beam CSI, etc.) may be defined. The use of CSI types is not limited to this.

[0020] As CSI feedback methods, periodic CSI (P-CSI) reporting, aperiodic CSI (A-CSI) reporting, semi-persistent CSI (SP-CSI) reporting, etc. are being considered.

[0021] The UE may be notified of the CSI measurement configuration information using higher layer signaling, physical layer signaling, or a combination thereof.

[0022] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0023] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0024] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0025] The CSI measurement configuration information may be configured, for example, using the RRC information element "CSI-MeasConfig." The CSI measurement configuration information may include CSI resource configuration information (RRC information element "CSI-ResourceConfig"), CSI reporting configuration information (RRC information element "CSI-ReportConfig"), etc. The CSI resource configuration information relates to resources for CSI measurement, and the CSI reporting configuration information relates to how the UE performs CSI reporting.

[0026] 1A and 1B are diagrams illustrating an example of RRC information elements related to CSI reporting configuration and CSI resource configuration. In this example, excerpts of fields (which may also be referred to as parameters) included in the information elements are illustrated. 1A and 1B are written using ASN.1 (Abstract Syntax Notation One) notation. Note that other figures relating to RRC information elements (or RRC parameters) in the present disclosure are also written using the same notation.

[0027] As shown in FIG. 1A , the CSI reporting configuration information ("CSI-ReportConfig") includes resource information for channel measurement ("resourcesForChannelMeasurement"). The CSI reporting configuration information may also include resource information for interference measurement (e.g., NZP CSI-RS resource information for interference measurement ("nzp-CSI-RS-ResourcesForInterference"), CSI-IM resource information for interference measurement ("csi-IM-ResourcesForInterference"), etc.). These pieces of resource information correspond to the ID (Identifier) ​​of the CSI resource configuration information ("CSI-ResourceConfigId").

[0028] In addition, the IDs of the CSI resource configuration information corresponding to each piece of resource information (which may also be called CSI resource configuration IDs) may be one or more of the same value, or may each have a different value.

[0029] 1B , the CSI resource configuration information (“CSI-ResourceConfig”) may include a CSI resource configuration information ID, CSI-RS resource set list information (“csi-RS-ResourceSetList”), a resource type (“resourceType”), etc. The CSI-RS resource set list may include at least one of NZP CSI-RS and SSB information for measurement (“nzp-CSI-RS-SSB”) and CSI-IM resource set list information (“csi-IM-ResourceSetList”).

[0030] The resource type indicates the time domain behavior of this resource configuration, and can be set to "aperiodic," "semi-persistent," or "periodic." For example, the corresponding CSI-RSs may be called A-CSI-RS, SP-CSI-RS, and P-CSI-RS, respectively.

[0031] The channel measurement resources may be used to calculate, for example, CQI, PMI, L1-RSRP, etc. The interference measurement resources may be used to calculate L1-SINR, L1-SNR, L1-RSRQ, and other indices related to interference.

[0032] When interference measurements are performed on CSI-IM, each CSI-RS for channel measurements may be associated with a CSI-IM resource in terms of resources based on the order of the CSI-RS resources and CSI-IM resources in the corresponding resource set.

[0033] The "nzp-CSI-RS-SSB" may include NZP CSI-RS resource set list information ("nzp-CSI-RS-ResourceSetList") and SSB resource set list information for CSI measurements ("csi-SSB-ResourceSetList"), which correspond to one or more NZP CSI-RS resource set IDs ("NZP-CSI-RS-ResourceSetId") and CSI-SSB resource set IDs ("CSI-SSB-ResourceSetId"), respectively, and may be used to identify resources to be measured.

[0034] The NZP CSI-RS resource set list information ("nzp-CSI-RS-ResourceSetList") may include an NZP CSI-RS resource set ID ("NZP-CSI-RS-ResourceSetId") of the maximum number of NZP CSI-RS resource sets per CSI resource configuration ("maxNrofNZP-CSI-RS-ResourceSetsPerConfig"), which may be up to 16 if the resource type is "aperiodic" and 1 otherwise (if the resource type is "semi-persistent" or "periodic").

[0035] The SSB resource set list information for CSI measurements ("csi-SSB-ResourceSetList") may include the CSI-SSB resource set IDs ("CSI-SSB-ResourceSetId") of the maximum number of SSB resource sets for CSI measurements per CSI resource configuration ("maxNrofCSI-SSB-ResourceSetsPerConfig"). The maximum number of SSB resource sets for CSI measurements per CSI resource configuration ("maxNrofCSI-SSB-ResourceSetsPerConfig") may be 1.

[0036] The CSI-IM resource set list information ("csi-IM-ResourceSetList") may include the CSI-IM resource set ID ("CSI-IM-ResourceSetId") of the maximum number of CSI-IM resource sets per CSI resource configuration ("maxNrofCSI-IM-ResourceSetsPerConfig"), which may be up to 16 if the resource type is "aperiodic" and 1 otherwise.

[0037] 2A and 2B are diagrams illustrating example RRC information elements for NZP CSI-RS resource sets and CSI-SSB resource sets.

[0038] As shown in FIG. 2A , the NZP CSI-RS resource set information (“NZP-CSI-RS-ResourceSet”) includes an NZP CSI-RS resource set ID and one or more NZP CSI-RS resource IDs (“NZP-CSI-RS-ResourceId”).

[0039] The NZP CSI-RS resource information ("NZP-CSI-RS-Resource") may include an NZP CSI-RS resource ID and an ID ("TCI-stateId") of a transmission configuration indication state (TCI state). The TCI state will be described later.

[0040] As shown in Figure 2B, the CSI-SSB resource set information ("CSI-SSB-ResourceSet") includes a CSI-SSB resource set ID and one or more SSB index information ("SSB-Index"), which may be an integer between 0 and 63, inclusive, and may be used to identify an SSB within an SS burst.

[0041] FIG. 3 is a diagram showing an example of RRC information elements related to the TCI state.

[0042] The TCI state is information about the Quasi-Co-Location (QCL) of a channel or a signal, and may also be called spatial reception parameters, spatial relation info, etc. The TCI state may be configured or specified to the UE on a per-channel or per-signal basis.

[0043] As shown in Fig. 3, the TCI state information ("TCI-State") may include a TCI state ID and one or more pieces of QCL information ("QCL-Info"). The QCL information may include at least one of information on a reference signal of the QCL source (RS-related information ("referenceSignal")) and information indicating a QCL type (QCL type information ("qcl-Type")). The RS-related information may include information such as an index of the RS (e.g., NZP CSI-RS resource ID, SSB index), a serving cell index, and an index of a BWP (Bandwidth Part) where the RS is located.

[0044] The UE may control reception processing (e.g., at least one of reception, demapping, demodulation, decoding, receive beam determination, etc.), transmission processing (e.g., at least one of transmission, mapping, modulation, coding, transmit beam determination, etc.), etc. for at least one of a signal and a channel (referred to as a signal / channel) based on the TCI state corresponding to the TCI state ID associated with the signal / channel.

[0045] As shown in Figure 2A, for the P-CSI-RS, the associated TCI state may be configured by RRC, whereas for the P-CSI-RS, SP-CSI-RS, and A-CSI-RS, the associated TCI state may be determined based on higher layer signaling, physical layer signaling, or a combination thereof.

[0046] (Beam Management) In Rel. 15 NR, a method of Beam Management (BM) has been considered. In this beam management, beam selection is performed based on the L1-RSRP reported by the UE. Changing (switching) the beam of a certain signal / channel may correspond to changing at least one of the TCI state and QCL assumption of the signal / channel.

[0047] The UE may report (transmit) measurement results for beam management using an uplink control channel (Physical Uplink Control Channel (PUCCH)) or an uplink shared channel (Physical Uplink Shared Channel (PUSCH)). The measurement results may be CSI including at least one of L1-RSRP, L1-RSRQ, L1-SINR, and L1-SNR, for example.

[0048] Measurement results (e.g., CSI) reported for beam management may be referred to as beam measurements, beam measurement reports, beam reports, beam report CSI, etc.

[0049] The CSI measurement for the beam report may include interference measurement. The UE may measure channel quality, interference, etc. using resources for CSI measurement to derive a beam report.

[0050] The beam report may include at least one of a channel quality measurement result and an interference measurement result. The channel quality measurement result may include, for example, L1-RSRP. The interference measurement result may include, for example, L1-SINR, L1-SNR, L1-RSRQ, or other interference-related indicators (e.g., any indicator other than L1-RSRP).

[0051] The CSI reporting configuration information taking into account the current NR beam management will be described with reference to Figure 4. Figure 4 is an excerpt of the RRC information element "CSI-ReportConfig". Figure 4 excerpts another part of the same CSI reporting configuration information (CSI-ReportConfig) as Figure 1A.

[0052] The CSI reporting configuration information may include a "report quantity" (which may be represented by the RRC parameter "reportQuantity"), which is information on parameters to be reported in one report instance (e.g., one CSI). The report quantity is defined by an ASN.1 object type called "choice type." Therefore, one of the parameters (cri-RSRP, ssb-Index-RSRP, etc.) defined as the report quantity is set.

[0053] A UE in which an upper layer parameter included in the CSI reporting setting information (e.g., the RRC parameter "groupBasedBeamReporting" related to group-based beam reporting) is set to disabled may include in a beam report (one report instance) for each report setting, different numbers of beam measurement resource IDs (e.g., SSBRI, CRI) for the upper layer parameter included in the CSI reporting setting information (e.g., the RRC parameter "nrofReportedRS" indicating the number of RSs to be reported), and measurement results (e.g., L1-RSRP) corresponding to each ID.

[0054] A UE with groupBasedBeamReporting enabled may include, for each report configuration, two different beam measurement resource IDs and two measurement results (e.g., L1-RSRP) corresponding to the respective IDs in the beam report. In other words, a UE with groupBasedBeamReporting enabled divides DL-RSs (e.g., CSI-RSs) into two groups and reports the ID and measurement results for the top RS in each group. Note that the two beam measurement resources (CSI-RS resources, SSB resources) may be simultaneously received by the UE using one spatial domain receive filter or multiple simultaneous spatial domain receive filters.

[0055] 2A may include information regarding repetition of resources within the resource set. The information regarding repetition may indicate, for example, 'on' or 'off'. Note that 'on' may be expressed as 'enabled' or 'valid', and 'off' may be expressed as 'disabled' or 'invalid'.

[0056] For example, for a resource set with repetition set 'on', the UE may assume that the resources in that resource set are transmitted using the same downlink spatial domain transmission filter, and in this case, the UE may assume that the resources in that resource set are transmitted using the same beam (e.g., from the same base station).

[0057] For a resource set for which repetition is set to 'off', the UE may control such that it must not (or may not) assume that resources within the resource set are transmitted using the same downlink spatial-domain transmit filter. In this case, the UE may assume that resources within the resource set are not transmitted using the same beam (transmitted using different beams). In other words, for a resource set for which repetition is set to 'off', the UE may assume that the base station is performing beam sweeping.

[0058] In Rel. 15 NR, the cri-RSRP and ssb-index-RSRP reporting parameters are related to beam management. A UE configured with cri-RSRP as the reporting parameter reports a CRI and the L1-RSRP corresponding to the CRI. A UE configured with ssb-index-RSRP as the reporting parameter reports an SSBRI and the L1-RSRP corresponding to the SSBRI.

[0059] Fig. 5 is a diagram illustrating an example of a CSI report in Rel. 15 NR. Fig. 5 illustrates the mapping order of CSI fields included in one CSI report (n-th CSI report #n) for CSI / RSRP or SSBRI / RSRP reporting, as specified in Rel. 15.

[0060] The CSI report in Fig. 5 may include one or more pairs of CRI / SSBRI and RSRP, the number of which may be configured by a higher layer parameter (e.g., the RRC parameter "nrofReportedRS") indicating the number of reference signal resources to be reported.

[0061] For L1-RSRP reporting, if nrofReportedRS is set to 1 (value 'n1'), RSRP#1, a field of a predetermined number of bits (e.g., m bits) indicating the L1-RSRP of the largest measurement value, is included in the CSI report. In Rel. 15 NR, m=7.

[0062] For L1-RSRP reporting, if nrofReportedRS is set to a value greater than 1 or if groupBasedBeamReporting is enabled, the UE uses differential L1-RSRP-based reporting. Specifically, the UE includes, in the same CSI report (reporting instance), RSRP#1 indicating the L1-RSRP of the largest measured value and differential RSRP#k calculated for the kth (k=2, 3, 4 in FIG. 5) largest L1-RSRP by referring to the largest measured value (e.g., as a difference from the measured value). Here, differential RSRP#k may be a field of fewer bits (e.g., n bits) than the predetermined number. In Rel. 15 NR, n=4.

[0063] For example, for each group, a 7-bit absolute RSRP value (ranging from -140 to -44 dBm with a 1 dB step size) for the first beam and a 4-bit differential RSRP value for the second beam are reported.

[0064] Note that when groupBasedBeamReporting is enabled, the UE includes RSRP#1 and differential RSRP#2 in the same CSI report.

[0065] CRI / SSBRI#k in FIG. 5 is a field indicating the CRI / SSBRI corresponding to RSRP#k or differential RSRP#k (included when reporting RSRP#k or differential RSRP#k).

[0066] In addition, in NRs from Rel. 16 onwards, nrofReportedRS may be a value equal to or greater than 4. A CSI report may include four or more sets of CRI / SSBRI and RSRP. The above m, n etc. are not limited to 7 and 4, respectively.

[0067] In addition, in NRs from Rel. 16 onwards, L1-SINR reporting may be performed. For the L1-SINR report, the RSRP in the above-mentioned L1-RSRP report may be replaced with SINR. In this case, the settings / parameters for SINR may be different from the settings / parameters for RSRP. For example, the above nrofReportedRS may be replaced with nrofReportedRSForSINR, which indicates the number of reference signal resources to be reported for SINR.

[0068] For L1-RSRP computation, the UE may be configured with a CSI-RS resource setting of up to 16 CSI-RS resource sets, with each resource set containing up to 64 resources. The total number of different CSI-RS resources across all resource sets may be up to 128.

[0069] For L1-SINR computation, in channel measurements, the UE may be configured with a CSI-RS resource setting of up to 16 CSI-RS resource sets, including a total of up to 64 CSI-RS resources or up to 64 SS / PBCH blocks.

[0070] For a UE configured with information about the CSI aperiodic trigger state list (higher layer parameter "CSI-AperiodicTriggerStateList"), if a resource setting linked to a CSI-ReportConfig has multiple aperiodic resource sets, only one of the aperiodic CSI-RS resources of the resource setting may be associated with a trigger state. In this case, the UE may be configured by a higher layer for each trigger state and for each resource setting to select one CSI-IM / NZP CSI-RS resource set from the resource setting.

[0071] The UE does not need to expect or assume that more than 64 NZP CSI-RS resources and / or SS / PBCH block resources are configured in the channel measurement resource setting of the CSI-ReportConfig in which the report quantity (higher layer parameter reportQuantity) is set to "none", "cri-RI-CQI", "cri-RSRP", "ssb-Index-RSRP", "cri-SINR", or "ssb-Index-SINR".

[0072] If a UE is configured with a CSI-ReportConfig in which the report quantity (higher layer parameter reportQuantity) is set to "cri-RSRP", "cri-SINR", or "none", and this CSI-ReportConfig is linked to a resource setting in which the higher layer parameter resourceType is set to "aperiodic", the UE may not assume that more than 16 CSI-RS resources are configured in the CSI-RS resource set included in this resource setting.

[0073] When a CSI-ReportConfig with the report quantity (higher layer parameter reportQuantity) set to "cri-RSRP", "cri-RI-PMI-CQI", "cri-RI-i1", "cri-RI-i1-CQI", "cri-RI-CQI", "cri-RI-LI-PMI-CQI", or "cri-SINR" is configured for a UE and two or more resources for channel measurement are configured in the corresponding resource set, the UE may derive CSI parameters other than the CRI based on the reported CRI. Here, CRI k (k≧0) may correspond to the configured k+1-th entry of the associated nzp-CSI-RS-Resources in the NZP-CSI-RS-ResourceSet for the corresponding channel measurement and the k+1-th entry of the associated csi-IM-Resource in the csi-IM-ResourceSet, or the k+1-th entry of the associated nzp-CSI-RS-Resources in the NZP-CSI-RS-ResourceSet for the corresponding interference measurement (when reportQuantity is set to "cri-SINR" in the CSI-ReportConfig). If two CSI-RS resources are configured, each resource may include up to 16 CSI-RS ports. If three to eight CSI-RS resources are configured, each resource may include up to eight CSI-RS ports.

[0074] If the UE is configured with a CSI-ReportConfig with the reporting quantity (higher layer parameter reportQuantity) set to "ssb-Index-RSRP", it may report an SSBRI, where SSBRI k (k≧0) may correspond to the k+1-th entry configured in the associated csi-SSB-ResourceList in the corresponding CSI-SSB-ResourceSet.

[0075] If the UE is configured with a CSI-ReportConfig with the report quantity (higher layer parameter reportQuantity) set to "ssb-Index-SINR", it may derive the L1-SINR conditioned on the reported SSBRI, where SSBRI k (k≧0) may correspond to the configured k+1-th entry of the associated csi-SSB-ResourceList in the corresponding CSI-SSB-ResourceSet for channel measurement and the k+1-th entry of the associated csi-IM-Resource in the csi-IM-ResourceSet, or the k+1-th entry of the associated nzp-CSI-RS-Resources in the corresponding NZP-CSI-RS-ResourceSet for interference measurement.

[0076] (Extended group-based beam reporting) For future wireless communication systems (e.g., Rel. 17 and later), beam management-related extensions (e.g., beam reports suitable for multiple TRPs, which may also be called extended group-based beam reporting) are being considered for user terminals (user terminals, User Equipment (UE)) with multiple panels (multi-panels), multiple transmission / reception points (multi-TRPs), etc.

[0077] The above-mentioned groupBasedBeamReporting can report two groups in one report, making it suitable for cases where multi-TRP transmission, multi-panel reception, etc. are applied. For example, it can be used to report the best beam for TRP1 as RSRP#1 and the best beam for TRP2 as differential RSRP#2.

[0078] As described above, in Rel. 15 and 16, a UE with group-based beam reporting enabled can only report two different CRIs / SSBRIs (which may be read as beam indices) for each reporting configuration. For this reason, for Rel. 17, studies are underway to increase the number of groups that can be reported by group-based beam reporting beyond two. Furthermore, for more flexible reporting, a configuration is also underway that allows reporting of two or more CRIs / SSBRIs within a group.

[0079] A group-based beam report using such a beam report (a beam report in which the number of groups for the report is greater than two or in which two or more CRIs / SSBRIs are reported within a group for the report) may be referred to as a multiple group-based beam, an extended group-based beam report, a Rel. 17 group-based beam report, etc. (hereinafter referred to as a multiple group-based beam report).

[0080] There are two possible modes for operating multiple group-based beam reporting: Mode 1: The UE can simultaneously receive multiple beams belonging to different groups; Mode 2: The UE can simultaneously receive multiple beams belonging to the same group.

[0081] Hereinafter, a situation in which multiple group-based beam reporting is used will be described using the environment of Fig. 6 as an example. Fig. 6 is a diagram showing an example of a beam usage environment assumed for multiple group-based beam reporting.

[0082] In Figure 6, the UE measures the resources of the reference signal (CSI-RS) transmitted from two TRPs (TRPs #1 and #2). The UE has two panels (Panels #1 and #2), each of which can form a different beam (B1-1, B1-2, B2-1, B2-2).

[0083] TRP #1 transmits CSI-RS using resources CRI #1-1 to CRI #1-4, each corresponding to a different beam. TRP #2 transmits CSI-RS using resources CRI #2-1 to CRI #2-4, each corresponding to a different beam. In the present disclosure, beams CRI #1-1 to CRI #1-4 may be interchangeably referred to as transmit beams #1-#4, respectively. In the present disclosure, beams CRI #2-1 to CRI #2-4 may be interchangeably referred to as transmit beams #5-#8, respectively.

[0084] In addition, each TRP and UE may transmit and receive by sweeping their respective beams (using different times / frequencies), or may transmit and receive using several beams simultaneously.

[0085] Note that Figure 6 is just an example, and for example, TRP #1 and #2 may be interpreted as two panels (panels #1 and #2) of a certain TRP.

[0086] The RSRP / SINR corresponding to CRI#1-1 to CRI#1-4 may be written as RSRP / SINR#1-1 to RSRP / SINR#1-4, respectively. The RSRP / SINR corresponding to CRI#2-1 to CRI#2-4 may be written as RSRP / SINR#2-1 to RSRP / SINR#2-4, respectively.

[0087] Furthermore, hereinafter, a resource corresponding to a certain CRI may be simply referred to as a certain CRI (for example, CRI#1-1 may mean CRI#1-1 or may mean a resource corresponding to CRI#1-1).

[0088] In the present disclosure, it is assumed that one resource configuration (which may be referred to as a reference signal (RS) configuration) corresponds to (is associated with) one TRP. The resource configuration corresponding to one TRP may correspond to at least one of CSI resource configuration information ("CSI-ResourceConfig"), a CSI-RS resource set list, an NZP CSI-RS resource set, and a CSI-SSB resource set.

[0089] For example, with respect to Figure 6, RRC configuration may be performed as follows: CSI reporting configuration #0 configured in the UE includes CSI resource configurations #0 and #1. CSI resource configuration #0 is associated with resource set #0 (CSI-RS resource set #0), and four CSI-RS resources corresponding to CRIs #1-1 to #1-4 are configured in resource set #0. CSI resource configuration #1 is associated with resource set #1 (CSI-RS resource set #1), and four CSI-RS resources corresponding to CRIs #2-1 to #2-4 are configured in resource set #1.

[0090] In addition, the contents of the present disclosure may also be applied when one resource setting corresponds to (is associated with) multiple TRPs.

[0091] Figure 7 shows an example of a CSI report for Mode 1 of multiple group-based beam reporting. In the example shown in Figure 7, the UE selects beams from two TRPs #1 measured using Panel #1 and selects beams from two TRPs #2 measured using Panel #2. Note that in this example, the UE assumes that Panel #1 is associated with Group #1 and Panel #2 is associated with Group #2.

[0092] Hereinafter, the numbers of elements in the CRI measurement results and CSI report configurations in the drawings of this disclosure are merely examples and are not limited to these numbers.

[0093] In this case, the UE determines CRI#1-1 and CRI#1-3 to be reported among the CRIs of CSI resource configuration #0 associated with TRP#1 for group #1 (panel #1). Also, the UE determines CRI#2-2 and CRI#2-3 to be reported among the CRIs of CSI resource configuration #1 associated with TRP#2 for group #2 (panel #2).

[0094] Figure 8 shows an example of a CSI report for Mode 2 of multiple group-based beam reporting. In the example of Figure 8, the UE selects, for each group, a beam from one TRP measured using Panel #1 and a beam from the other TRP measured using Panel #2.

[0095] In this case, for group #1, the UE selected CRI #1-1 as the report target from among the CRIs corresponding to TRP #1 in receiving panel #1, and CRI #2-2 as the report target from among TRP #2 different from TRP #1 in receiving panel #2. Also, for group #2, the UE selected CRI #2-3 as the report target from among the CRIs corresponding to TRP #2 in receiving panel #1, and CRI #1-2 as the report target from among TRP #1 different from TRP #2 in receiving panel #2.

[0096] Either Mode 1 or Mode 2 may be supported by the UE, or both may be supported.

[0097] (Analysis) Beam measurement / reporting may follow at least one of the following options 1 to 3. This beam measurement / reporting may be used for inter-TRP beam pairing, where option 1 corresponds to mode 1 and option 2 corresponds to mode 2. Each option may be referred to as a beam reporting option.

[0098] [Option 1] In CSI reporting, the UE may report N (N>1) pairs / groups and M (M>=1) beams per pair / group. Different beams in different pairs / groups may be received simultaneously.

[0099] [Option 2] In CSI reporting, the UE may report N (N>=1) pairs / groups and M (M>1) beams per pair / group. Different beams in one pair / group may be received simultaneously.

[0100] [Option 3] The UE may report M (M >= 1) beams in N (N > 1) CSI reports corresponding to N (N > 1) reporting settings. Different beams corresponding to different CSI reports may be received simultaneously.

[0101] In Rel. 17 and later, it is being considered whether feedback related to UE panels / antennas (receiving panels / antennas / filters) (e.g., including group-based beam reporting option 2) is supported in beam reporting option 2 for multi-TRP. In the supported cases, at least one of the following options 1 to 3 is being considered: Option 1: Whether multiple beams are associated with different receiving panels / filters. Option 2: Whether multiple beams are received for spatial multiplexing or spatial diversity. Option 3: The maximum number of layers supported per DL RS in one group.

[0102] In addition, for Rel. 17 and later, for beam reporting option 2 for multi-TRP, it is being considered whether or not assumptions related to UE panels / antennas (receiving panels / antennas) are to be instructed / configured by the network (NW, e.g., base station) for the beam reporting option 2 for multi-TRP. In the case where such assumptions are supported, options 1 to 3 described above are being considered.

[0103] More specifically, for beam reporting option 2, it is considered that at least one of the following options A to C is performed, or at least one of options A and B is performed: Option A: The base station (NW) configures / instructs the UE whether to report beams associated with the same receive spatial filter or beams associated with different receive spatial filters. Option B: The UE notifies / reports to the NW (base station) whether the reported beams (reported beams in a beam group) are associated with the same receive spatial filter or whether the reported beams (reported beams in a beam group) are associated with different receive spatial filters. Option C: The base station (NW) is notified of the number of supported layers (maximum number) per receive spatial filter by UE capability signaling.

[0104] However, the setting / reporting in group-based beam reporting in Rel. 17 and later has not yet been sufficiently studied. If these studies are not sufficient, appropriate communication between the TRP and the UE may not be possible, and communication throughput may decrease.

[0105] Therefore, the inventors came up with a method of setting and reporting in group-based beam reporting.

[0106] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0107] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be read as interchangeable. In the present disclosure, sequence, list, set, group, group, cluster, subset, etc. may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be read as interchangeable.

[0108] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read interchangeably.

[0109] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher layer parameters, RRC information elements (IEs), RRC messages, and settings may be read interchangeably.

[0110] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. In the present disclosure, the MAC CE, an update command, and an activation / deactivation command may be read interchangeably.

[0111] The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI, SIB1), Other System Information (OSI), etc.

[0112] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, receive spatial filter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS of QCL type D for TCI state / QCL assumption, RS of QCL type A for TCI state / QCL assumption, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, and PL-RS may be interpreted as interchangeable. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, source of DL-RS, SSB, CSI-RS, and SRS may be read interchangeably.

[0113] In the present disclosure, the terms panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmitting entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), Spatial Relation, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), base station, antenna port of a certain signal (e.g., Demodulation Reference Signal (DMRS) port), DMRS, 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), Physical Uplink Control Channel (PUCCH) group, PUCCH resource group, resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, CORESET subset, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, redundancy version (RV), and layer (multi-input multi-output (MIMO) layer, transmission layer, spatial layer) may be read as interchangeable.In addition, a panel identifier (ID) and a panel may be interchangeable. In the present disclosure, a TRP ID and a TRP may be interchangeable.

[0114] The panel may be associated with at least one of a group index of an SSB / CSI-RS group, a group index of a group-based beam report, and a group index of an SSB / CSI-RS group for group-based beam reporting.

[0115] Furthermore, the panel identifier (ID) and the panel may be interchangeable. That is, the TRP ID and the TRP, the CORESET group ID and the CORESET group, etc. may be interchangeable.

[0116] In the present disclosure, the terms TRP, transmission point, panel, DMRS port group, CORESET pool, and one of two TCI states associated with one code point in the TCI field may be read interchangeably.

[0117] In this disclosure, the terms "single TRP," "single TRP system," "single TRP transmission," and "single PDSCH" may be interchangeable. In this disclosure, the terms "multiple TRP," "multiple TRP system," "multiple TRP transmission," and "multiple PDSCH" may be interchangeable. In this disclosure, the terms "single DCI," "single PDCCH," "multiple TRP based on a single DCI," and "activating two TCI states on at least one TCI codepoint" may be interchangeable.

[0118] In the present disclosure, single TRP, channel using single TRP, channel using one TCI state / spatial relationship, multi-TRP not enabled by RRC / DCI, multiple TCI states / spatial relationships not enabled by RRC / DCI, a CORESETPoolIndex value of 1 not set for any CORESET, and no code point in the TCI field mapped to two TCI states may be read interchangeably.

[0119] In the present disclosure, "multi-TRP," "channel using multi-TRP," "channel using multiple TCI states / spatial relationships," "multi-TRP being enabled by RRC / DCI," "multiple TCI states / spatial relationships being enabled by RRC / DCI," and "at least one of multi-TRP based on a single DCI" and "multi-TRP based on multiple DCI" may be interchangeable. In the present disclosure, "multi-TRP based on multiple DCI," and "setting a CORESET pool index (CORESETPoolIndex) value of 1 for the CORESET" may be interchangeable. In the present disclosure, "multi-TRP based on a single DCI," and "at least one code point in the TCI field is mapped to two TCI states" may be interchangeable.

[0120] In the present disclosure, TRP #1 (first TRP) may correspond to CORESET pool index = 0 or may correspond to the first of two TCI states corresponding to one code point in the TCI field. TRP #2 (second TRP) TRP #1 (first TRP) may correspond to CORESET pool index = 1 or may correspond to the second of two TCI states corresponding to one code point in the TCI field.

[0121] In the present disclosure, multi-DCI (mDCI), multi-PDCCH, multi-TRP system based on multi-DCI, mDCI-based MTRP, and setting two CORESET pool indices or CORESET pool index = 1 (or a value greater than or equal to 1) may be read interchangeably.

[0122] The QCL in the present disclosure may be interchangeably read as QCL Type D.

[0123] In the present disclosure, expressions such as "TCI state A is of QCL type D, the same as TCI state B," "TCI state A is the same as TCI state B," and "TCI state A is of QCL type D with TCI state B" may be interpreted interchangeably.

[0124] In the present disclosure, CSI-RS, NZP-CSI-RS, periodic (P)-CSI-RS, P-TRS, semi-persistent (SP)-CSI-RS, aperiodic (A)-CSI-RS, TRS, tracking CSI-RS, CSI-RS having TRS information (upper layer parameter trs-Info), NZP CSI-RS resource in an NZP CSI-RS resource set having TRS information, NZP-CSI-RS resource in an NZP-CSI-RS resource set consisting of multiple NZP-CSI-RS resources of the same antenna port, TRS resource, may be interpreted as interchangeable. In the present disclosure, CSI-RS resource, CSI-RS resource set, CSI-RS resource group, information element (IE), may be interpreted as interchangeable.

[0125] In this disclosure, the terms determine, judge, discover, search, and measure may be read interchangeably.

[0126] (Wireless Communication Method) In each embodiment, at least one of the above options 1, 2, and 3 may be referred to as a beam group type. For example, the beam group type may indicate at least one of whether multiple (two) beams in one beam group are associated with different receive spatial filters, whether multiple (two) beams in one beam group are received for spatial multiplexing or for spatial diversity, and the (maximum) number of layers supported per DL RS in one group. In each embodiment, the terms beam group type, type, scheme, mode, and setting may be interchangeable.

[0127] <First embodiment> The UE may be configured with a beam group type from a network / base station in a group-based beam report. The UE may report the beam group type in a group-based beam report (see FIG. 9).

[0128] The UE may receive the beam group type configuration using higher layer signaling (e.g., RRC signaling / MAC CE). The beam group type may be reported in a beam report.

[0129] After the UE is configured with a beam group type from the network / base station, it may perform beam measurements based on the configuration to determine (discover) a specific number of beam groups (e.g., N, where N is an integer greater than or equal to 1).

[0130] The determined beam group may be a beam group whose reception index (or measurement result, for example, L1-RSRP / L1-SINR) exceeds a certain threshold.

[0131] When the UE has determined (could determine) N beam groups, it may report the N beam groups using the same beam group type indication (information indicating the beam group type) / identifier as the beam group type set by the NW / base station. Note that determining N beam groups may mean that at least N beam groups whose reception indicators exceed a specific threshold have been found.

[0132] If the UE has not determined (e.g., cannot determine) the N beam groups, it may not report the N beam groups using the same beam group type indication / identifier as the beam group type set by the NW / base station. For example, if the UE has not determined (e.g., cannot determine) the N beam groups, it may measure / determine / discover beam groups of a beam group type different from the beam group type set by the NW / base station and report the N beam groups using an indication / identifier of the beam group type different from the set beam group type.

[0133] In this case, the N beam groups may belong to the same beam group type. In this case, the N beam groups may have the same beam group type.

[0134] In addition, the beam group type indication / identifier may indicate whether the beam group reported by the UE is the same as the beam group type set by the NW / base station.

[0135] For example, if the UE has not determined (e.g., could not determine) N beam groups, it may report an indication / identifier of a beam group type different from the configured beam group type and not report the beam measurement results corresponding to that report. For example, if the UE has not determined (e.g., could not determine) N beam groups, it may report only the beam groups that it has been able to determine and not report the beam measurement results for the number of beams less than N. This method makes it possible to implicitly indicate to the NW that N beam groups have not been determined.

[0136] For example, if the UE does not (e.g., cannot) determine N beam groups for the configured beam group type, but determines fewer than N (e.g., X) beam groups for the configured beam group type, the UE may measure / determine / discover N-X beam groups of a beam group type different from the configured beam group type. The UE may report the total N beam groups to the NW / base station using an indication / identifier of the beam group type for each beam group.

[0137] The NW / base station may configure multiple (e.g., two) different beam group types in the CSI reporting configuration and configure the same or different number of beam groups for each beam group type. The UE may be configured with multiple (e.g., two) different beam group types through the CSI reporting configuration and configure the same or different number of beam groups for each beam group type. This allows the UE to report the indication / identifier of the beam group type for each of multiple beam groups.

[0138] If the UE does not (could not) determine the beam / beam group, the UE may report a specific reception index value in a correspondence relationship (e.g., a table) defined in advance (in the specification) as the measurement result. The specific reception index value may be, for example, the lowest reception index value in the correspondence relationship.

[0139] According to the first embodiment described above, by having the network / base station set the beam group type for the UE, the network / base station that recognizes the traffic type / schedule information can set the beam group type within the beam group required by the UE, and the type of each beam group reported from the UE can be effectively used for scheduling. Furthermore, by having the UE report the beam group type to the network / base station, the network / base station can appropriately determine the receive spatial filter determined by the UE.

[0140] Second Embodiment A higher layer parameter (RRC IE) / UE capability corresponding to a function (feature) in at least one of the above embodiments may be defined. The UE capability may indicate that the function is supported.

[0141] A UE configured with higher layer parameters corresponding to the function (enabling the function) may perform the function. It may also be specified that "a UE not configured with higher layer parameters corresponding to the function shall not perform the function (for example, in accordance with Rel. 15 / 16)."

[0142] A UE that reports a UE capability indicating that it supports the function may perform the function. It may also be specified that a UE that does not report a UE capability indicating that it supports the function shall not perform the function (e.g., in accordance with Rel. 15 / 16).

[0143] If the UE reports a UE capability indicating that it supports the function and the corresponding higher layer parameters are configured, the UE may perform the function. It may also be specified that "if the UE does not report a UE capability indicating that it supports the function or if the corresponding higher layer parameters are not configured, the UE shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0144] The UE capability may indicate whether the UE supports this feature.

[0145] The function may be the application of beam group types in group-based beam reporting.

[0146] The UE capability may be defined as whether or not the UE supports at least one of the configuration by the base station of the beam group type and the reporting by the UE. The configuration by the base station of the beam group type and the reporting by the UE may be performed for each reporting configuration and / or for each beam group in the CSI reporting configuration.

[0147] UE capability may be defined as whether or not the UE supports at least one of the base station configuration and UE reporting of indication of multiple beam group types in one CSI reporting configuration.

[0148] According to the second embodiment, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0149] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0150] 10 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0151] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0152] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0153] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0154] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0155] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0156] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0157] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0158] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0159] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0160] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0161] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0162] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0163] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0164] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0165] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0166] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0167] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0168] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0169] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0170] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0171] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0172] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0173] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0174] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0175] 11 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0176] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0177] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0178] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0179] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0180] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0181] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0182] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0183] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0184] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0185] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0186] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0187] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0188] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0189] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0190] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0191] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0192] The transceiver 120 may transmit a beam group type setting indicating at least one of whether multiple beams in a beam group are associated with different spatial domain receive filters, whether the multiple beams are used for spatial multiplexing or spatial diversity, and the maximum number of layers per downlink reference signal in the beam group. The control unit 110 may determine the beam group type to be reported based on the setting.

[0193] (User Terminal) Fig. 12 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

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

[0195] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

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

[0197] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

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

[0199] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0200] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0201] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

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

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

[0204] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0205] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0206] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0207] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

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

[0209] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0210] The transceiver 220 may receive a beam group type configuration indicating at least one of whether multiple beams in a beam group are associated with different spatial domain receive filters, whether the multiple beams are used for spatial multiplexing or spatial diversity, and the maximum number of layers per downlink reference signal in the beam group. The controller 210 may control the performance of beam measurements and the reporting of the beam group type based on the configuration.

[0211] If the beam measurement cannot determine a specific number (e.g., N) of beam groups based on the settings, the control unit 210 may determine the specific number of beam groups of a beam group type different from the settings and control the reporting of the determined beam groups.

[0212] If the beam measurement cannot determine a specific number (e.g., N) of beam groups based on the settings, and determines a first number (e.g., X) of beam groups that is smaller than the number based on the settings, the control unit 210 may determine the first number of beam groups of a beam group type based on the settings and control reporting of the determined beam groups.

[0213] If the beam measurement cannot determine a specific number (e.g., N) of beam groups based on the setting, and determines a first number (e.g., X) of beam groups that is smaller than the number based on the setting, the control unit 210 may determine the first number of beam groups of a beam group type based on the setting and a number (N-X) of beam groups of a beam group type different from the setting, which is the specific number minus the first number, and control the reporting of the determined beam groups.

[0214] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0215] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0216] For example, a base station, a user terminal, or the like according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 13 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0217] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0218] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0219] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0220] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0221] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0222] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0223] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0224] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0225] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0226] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0227] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0228] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0229] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0230] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0231] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0232] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0233] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0234] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0235] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0236] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0237] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0238] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0239] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0240] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0241] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0242] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0243] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0244] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0245] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0246] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0247] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0248] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0249] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0250] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0251] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0252] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0253] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0254] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0255] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0256] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0257] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0258] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0259] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0260] 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," "transmit 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. may be used interchangeably.

[0261] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0262] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0263] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0264] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0265] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0266] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0267] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0268] 14 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0269] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0270] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0271] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0272] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0273] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0274] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0275] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0276] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10, the user terminal 20, etc. described above. Furthermore, the communication module 60 may be, for example, the base station 10, the user terminal 20, etc. described above (or may function as the base station 10, the user terminal 20, etc.).

[0277] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0278] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0279] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0280] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0281] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0282] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0283] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0284] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0285] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0286] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0287] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0288] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0289] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0290] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0291] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0292] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0293] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0294] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0295] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0296] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0297] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

[0298] This application is based on Japanese Patent Application No. 2021-187075, filed on November 17, 2021, the contents of which are incorporated herein in their entirety.

Claims

1. A control unit that, when a specific number of beam groups based on settings cannot be determined in beam measurement and a first number of beam groups of a first type that is smaller than the specific number is determined, determines the first number of first beam groups of the first type and a second number of second beam groups of a second type different from the first type; a transmitting unit that transmits the first beam group and the second beam group in a report of one report instance, The terminal, wherein the second number is the specific number minus the first number.

2. A terminal as described in claim 1, wherein the multiple beams in each beam group of the first beam group and the second beam group are associated with different spatial domain filters.

3. When a specific number of beam groups based on the settings cannot be determined in beam measurement and a first number of beam groups of a first type that is smaller than the specific number is determined, a step of determining the first number of first beam groups of the first type and a second number of second beam groups of a second type different from the first type; transmitting the first beam group and the second beam group in a single report instance; The wireless communication method for a terminal, wherein the second number is the specific number minus the first number.

4. In a terminal, when a specific number of beam groups based on settings cannot be determined in beam measurement and a first number of beam groups of a first type that is smaller than the specific number is determined, a control unit controls the reception of a report of one report instance including the first number of first beam groups of the first type and a second number of second beam groups of a second type different from the first type; a transmitter that transmits the setting, The base station, wherein the second number is the specific number minus the first number.

5. A system including a terminal and a base station, The terminal a control unit that, when a specific number of beam groups based on the setting cannot be determined in beam measurement and a first number of beam groups of a first type that is smaller than the specific number is determined, determines the first number of first beam groups of the first type and a second number of second beam groups of a second type different from the first type; a transmitting unit that transmits the first beam group and the second beam group in a report of one report instance, the second number is the specific number minus the first number, The base station a transmitter for transmitting the configuration.