Terminal, wireless communication method and base station

Abstract

In order to properly report UE capability information, a terminal involved in one method of the present invention comprises: a receiving unit, which receives inquiry information of terminal capabilities, and the inquiry information of terminal capabilities includes at least one of information related to the maximum number of sending ports for each resource, information related to the maximum number of resources, and information related to the total number of sending ports; and a control unit, which, when reporting the combination of the maximum number of sending ports for each resource, the maximum number of resources, and the total number of sending ports as terminal capabilities, controls so that at least one of the maximum number of sending ports for each resource, the maximum number of resources, and the total number of sending ports is reported when the combination is smaller than a value notified by the inquiry information.

Description

Technical Field

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

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

[0003] Successor systems of LTE (for example, also referred to as fifth generation mobile communication system (5G), 5G+(plus), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

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

[0007] Problems to be solved by the invention

[0008] In Rel.15NR, support is provided for reporting UE capability information related to resources / ports of reference signals (eg, CSI-RS) used for channel state information (CSI) from the UE to the network.

[0009] For example, the UE reports information related to the number of CSI-RS resources / ports for each band and information related to the number of CSI-RS resources / ports for each combination of multiple bands (band combination (BC)) as UE capability information. The network (e.g., base station) controls the setting of CSI-RS resources / ports based on the information (or parameters) reported from the UE.

[0010] On the other hand, it is expected to reduce the overhead of UE capability information reported from the UE. In this case, it is considered to limit the reported UE capability information, but sufficient research has not been conducted on how to control the reported UE capability information.

[0011] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately report UE capability information.

[0012] Means for solving problems

[0013] A terminal involved in one method of the present disclosure is characterized in that it has: a receiving unit that receives inquiry information about terminal capabilities, the inquiry information about terminal capabilities including at least one of information related to the maximum number of sending ports for each resource, information related to the maximum number of resources, and information related to the total number of sending ports; and a control unit that, when reporting a combination of the maximum number of sending ports for each resource, the maximum number of resources, and the total number of sending ports as terminal capabilities, controls so that at least one of the maximum number of sending ports for each resource, the maximum number of resources, and the total number of sending ports is reported when the combination is smaller than a value notified by the inquiry information.

[0014] Effects of the Invention

[0015] According to one aspect of the present disclosure, UE capability information can be appropriately reported. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram showing an example of communication control between UE and the network related to UE capability information.

[0017] Figure 2 This is a diagram showing an example of CSI-RS-related parameters reported by the UE for each band.

[0018] Figure 3 This is a diagram showing an example of CSI-RS-related parameters reported by the UE for each BC.

[0019] Figure 4 This is a diagram showing an example of the activation period of the CSI-RS.

[0020] Figure 5 This is a diagram showing an example of the configuration of CSI-RS resources / ports for band A / band B.

[0021] Figure 6 (A) and Figure 6 (B) is a diagram showing an example of reporting the number of CSI-RS resources / number of ports.

[0022] Figure 7 This is a diagram showing an example of the content of UE-CapabilityTequestFilter notified by the network to the UE.

[0023] Figure 8 This is a diagram showing an example of reporting UE capability information based on a UE capability inquiry notified from the network.

[0024] Fig. 9 This is a diagram showing an example of reporting control of UE capability information involved in the first method.

[0025] Fig.10 This is a diagram showing another example of the reporting control of UE capability information involved in the first method.

[0026] Fig.11 This is a diagram showing another example of the reporting control of UE capability information involved in the first method.

[0027] Fig.12 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0028] Fig.13 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0029] Fig.14 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0030] Fig.15 This is a diagram showing an example of the hardware configuration of a base station and a user terminal involved in one embodiment. DETAILED DESCRIPTION

[0031] (UE capability report)

[0032] In a wireless communication system, a terminal (also referred to as a user terminal, user equipment (UE), etc.) reports the capability information of the terminal to the network (e.g., a base station or an operator) for each function used in communication. The UE capability information reported for each function is reported in various units such as per UE, per band, per BC, and per band in BC.

[0033] The network controls wireless communication (e.g., transmission / reception) with each UE based on the capability information reported from the UE. On the other hand, even if UE capability information that is not used in the wireless communication system (e.g., UE capability information for an unregulated band, etc.) is reported from the UE to the network, the network cannot use the reported UE capability information, and thus useless information is reported.

[0034] Therefore, the network may also notify the UE of information related to the communication conditions (e.g., supported bandwidth, etc.) used / supported in the network (or the communication system used by the network) before the UE reports the UE capability information of the terminal (see Figure 1 ). The UE may also determine the content / value of the UE capability information (eg, UECapabilityInformation) reported to the network based on the information notified from the network.

[0035] The information notified from the network to the UE may also be referred to as UE capability query / UE capability inquiry (eg, UECapabilityEnquiry) or UE capability request filter (eg, UE-CapabilityRequestFilter).

[0036] That is, the network may also notify the UE in advance of information related to UE capabilities that need to be reported (e.g., parameters, parameter ranges), or information related to UE capabilities that do not need to be reported (e.g., parameters, parameter ranges).

[0037] UE capability inquiry (e.g., UECapabilityEnquiry) information may also be included in a specific message sent from the network to the UE. The specific message may also be a DL-DCCH-Message. The UE capability inquiry information may also include information that the network requests the UE to filter UE capabilities (e.g., capabilityRequestFilter or UE-CapabilityRequestFilterNR). The information requesting filtering of UE capabilities may also include information related to the filter of the codebook parameters corresponding to the channel state information (CSI) (e.g., CodebookParameterFilter).

[0038] For example, the UE may also report information related to CSI reporting as UE capability information.

[0039] (CSI report or reporting)

[0040] In Rel.15NR, a terminal (also referred to as a user terminal, user equipment (UE), etc.) generates (also referred to as determining, calculating, estimating, measuring, etc.) channel state information (CSI) based on a reference signal (RS) (or resources used for the RS), and sends (also referred to as reporting, feedback, etc.) the generated CSI to a network (e.g., a base station). The CSI can also be sent to a base station using, for example, an uplink control channel (e.g., a physical uplink control channel (Physical Uplink Control Channel (PUCCH))) or an uplink shared channel (e.g., a physical uplink shared channel (Physical Uplink Shared Channel (PUSCH))).

[0041] The RS used in the generation of CSI may be, for example, at least one of the Channel State Information Reference Signal (CSI-RS), the Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, the Synchronization Signal (SS), the DeModulation Reference Signal (DMRS), etc.

[0042] The CSI-RS may also include at least one of a non-zero power (NZP) CSI-RS and a CSI-Interference Management (CSI-IM). The SS / PBCH block is a block including the SS and the PBCH (and the corresponding DMRS), and may also be referred to as an SS block (SSB), etc. In addition, the SS may also include at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS).

[0043] CSI may also include at least one parameter (CSI parameter) such as Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), CSI-RS Resource Indicator (CRI), SS / PBCH Block Resource Indicator (SS / PBCH Block Indicator (SSBRI)), Layer Indicator (LI), Rank Indicator (RI), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal-to-Noise and Interference Ratio or Signal to Interference plus Noise Ratio), and L1-SNR (Signal to Noise Ratio).

[0044] The UE may also receive information related to CSI reporting (report configuration information) and control CSI reporting based on the report configuration information. The report configuration information may also be, for example, "CSI-ReportConfig" of the information element (IE) of the Radio Resource Control (RRC). In addition, in the present disclosure, the RRC IE may also be replaced by RRC parameters, high-layer parameters, etc.

[0045] The report configuration information (eg, "CSI-ReportConfig" of RRC IE) may include, for example, at least one of the following.

[0046] Information related to the type of CSI report (report type information, such as "reportConfigType" of RRC IE)

[0047] Information related to one or more quantities of CSI to be reported (one or more CSI parameters) (report quantity information, such as "reportQuantity" in RRC IE)

[0048] Information on the RS resources used to generate the quantity (the CSI parameter) (resource information, such as "CSI-ResourceConfigId" in RRC IE)

[0049] Information related to the frequency domain that is the subject of CSI reporting (frequency domain information, such as "reportFreqConfiguration" in RRC IE)

[0050] For example, the report type information may also represent (indicate) a periodic CSI (Periodic CSI (P-CSI)) report, an aperiodic CSI (Aperiodic CSI (A-CSI)) report, or a semi-permanent (semi-persistent, semi-persistent (Semi-Persistent)) CSI report (Semi-Persistent CSI (SP-CSI)) report.

[0051] In addition, the reporting amount information may also specify a combination of at least one of the above-mentioned CSI parameters (for example, CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0052] In addition, the resource information may be an ID of a resource for RS. The resource for RS may include, for example, a non-zero-power CSI-RS resource or an SSB and CSI-IM resource (for example, a zero-power CSI-RS resource).

[0053] The UE performs channel estimation using the received RS and estimates a channel matrix H. The UE feeds back an index (PMI) determined based on the estimated channel matrix.

[0054] The PMI may also represent a precoder matrix (also referred to as a precoder for short) that the UE considers suitable for downlink (downlink (DL)) transmission to the UE. Each value of the PMI may also correspond to a precoder matrix. A set of PMI values ​​may also correspond to a set of different precoder matrices referred to as a precoder codebook (also referred to as a codebook for short).

[0055] In the spatial domain, the CSI report may also include more than one type of CSI. For example, the CSI may also include at least one of a first type (type 1 CSI) used in the selection of a single beam and a second type (type 2 CSI) used in the selection of multiple beams. A single beam may also be replaced with a single layer, and multiple beams may be replaced with multiple beams. In addition, type 1 CSI may not assume multi-user multiple input multiple output (MIMO), and type 2 CSI may assume multi-user MIMO.

[0056] The above codebook may also include a codebook for type 1 CSI (also referred to as type 1 codebook, etc.) and a codebook for type 2 CSI (also referred to as type 2 codebook, etc.). In addition, type 1 CSI may also include type 1 single-panel CSI and type 1 multi-panel CSI, and different codebooks (type 1 single-panel codebook, type 1 multi-panel codebook) may be specified.

[0057] In the present disclosure, type 1 and type I may also be replaced with each other. In the present disclosure, type 2 and type II may also be replaced with each other.

[0058] The uplink control information (UCI) type may also include at least one of a hybrid automatic repeat request acknowledgement (HARQ-ACK), a scheduling request (SR), and CSI. UCI may be carried by either PUCCH or PUSCH.

[0059] The UE may also report a list of supported CSI-RS resources per CSI codebook type. For example, the UE reports information related to the maximum number of transmit ports per resource, the maximum number of resources per band, and the total number of transmit ports per band (e.g., {maxNumberTxPortsPerResource, maxNumberResourcesPerBand, totalNumberTxPortsPerBand}).

[0060] The maximum number of transmit ports per resource (maxNumberTxPortsPerResource) indicates the maximum number of transmit ports in the resource (for example, the maximum number of transmit ports that can be set simultaneously in the CSI-RS resource). The maximum number of resources per band (maxNumberResourcesPerBand) indicates the maximum number of resources in all CCs (or cells) within the band (for example, the maximum number of CSI-RS resources that can be set simultaneously across all CCs). The total number of transmit ports per band (totalNumberTxPortsPerBand) indicates the total number of transmit ports in all CCs within the band (for example, the total number of transmit ports that can be set simultaneously across all CCs). In addition, CC is equivalent to the CC included in the band.

[0061] The UE may also report codebook parameters (e.g., codebookParameters) related to the codebook as band parameters (e.g., band NR parameters) for each band. The codebook parameters may also indicate parameters corresponding to the codebook supported by the UE. The codebook parameters may also include at least one of the following parameters (1)-(4) ( Figure 2 ). For example, (1) can also be required (mandatory), and (2)-(4) can also be optional.

[0062] (1) Parameters of the type 1 single panel codebook (type 1 single panel (type1 singlePanel)) supported by the UE

[0063] (2) Parameters of the type 1 multi-panel codebook (type 1 multi-panel) supported by the UE

[0064] (3) Parameters of the type 2 codebook (type 2) supported by the UE

[0065] (4) Parameters of the type 2 codebook with port selection supported by the UE (type2-PortSelection)

[0066] Each parameter of (1) to (4) may include information related to a list of CSI-RS resources supported by the UE (supportedCSI-RS-ResourceList). In addition, the information related to the list of CSI-RS resources may include the following parameter lists described above.

[0067] The maximum number of transmit ports per resource (maxNumberTxPortsPerResource)

[0068] The maximum number of resources per band (maxNumberResourcesPerBand)

[0069] The total number of transmit ports per band (totalNumberTxPortsPerBand)

[0070] The parameters (1)-(4) related to the above codebook reported by the UE may also be referred to as FG2-36 / 2-40 / 2-41 / 2-43. The parameters {first parameter (e.g., maxNumberTxPortsPerResource), second parameter (e.g., maxNumberResourcesPerBand), third parameter (e.g., totalNumberTxPortsPerBand)} included in the list of CSI-RS resources may also be referred to as triplets (e.g., Triplets). The triplets may also be replaced by a combination of parameters (or elements) included in the list of CSI-RS resources.

[0071] In addition, a UE supporting a combination of multiple bands may also report specific parameters (eg, UE capability information) for each combination of bands. The combination of bands may also be referred to as a Band Combination (BC).

[0072] Specific parameters (e.g., CA-ParametersNR, or csi-RS-IM-ReceptionForFeedbackPerBandComb) may also include a parameter corresponding to the maximum number of CSI-RS resources in all CCs / activated BWPs (e.g., maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC) and a parameter corresponding to the total number of ports of CSI-RS resources in all CCs / activated BWPs (e.g., totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC).

[0073] The parameter equivalent to the maximum number of CSI-RS resources in all CCs / activated BWPs (e.g., maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC) indicates the maximum number of CSI-RS resources that can be configured simultaneously across all CCs in an activated BWP. This parameter limits the total number of CSI-RS resources that the NW can configure across all CCs. This limitation can also be applied by the NW in addition to the limitation notified by the maximum number of CSI-RS resources per CC (e.g., maxNumberSimultaneousNZP-CSI-RS-PerCC).

[0074] The parameter equivalent to the total number of ports of CSI-RS resources in all CCs / activated BWPs (e.g., totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC) indicates the total number of ports of CSI-RS resources that are simultaneously set across all CCs in the activated BWP. This parameter limits the total number of ports that the NW can set across all CCs. This limitation can also be applied in addition to the limitation that the NW is notified of by the total number of ports of CSI-RS resources per CC (e.g., totalNumberPortsSimultaneousNZP-CSI-RS-PerCC).

[0075] A specific parameter related to a band combination (BC) reported by the UE (or a specific parameter reported per BC) may also be referred to as FG2-33.

[0076] The UE may also report codebook-related parameters (e.g., CodebookParameters) / triplets per band (see Figure 2 ), specific parameters (e.g., CA-ParametersNR) may also be reported per BC (see Figure 3 ).

[0077] In the CSI processing criteria, the UE may not assume that there are more than the number of activated CSI-RS ports or activated CSI-RS resources reported as capability information in any time slot. In the case of aperiodic CSI-RS, a CSI-RS (e.g., NZP CSI-RS) resource becomes active from the reception of a PDCCH containing a CSI request (e.g., the last symbol) to the transmission of a PUSCH for a CSI report (e.g., the last symbol) (see Figure 4 ). In the case of periodic CSI-RS, the CSI-RS (eg, NZP CSI-RS) resource becomes active from the time when the periodic CSI-RS is set by higher layer signaling until the CSI-RS is released.

[0078] The UE reports one or more codebook-related parameters (e.g., FG2-36 / 2-40 / 2-41 / 2-43) / triplets per band. For example, assume that the UE reports the following list as parameters / triplets ({maxNumberTxPortsPerResource, maxNumberResourcesPerBand, totalNumberTxPortsPerBand}) for band A and band B.

[0079] Band A: {16,1,16}, {8,2,12}

[0080] Band B: {16,1,16}, {8,2,12}

[0081] In this case, when the UE uses band A and band B in combination, it is necessary to support {16, 2, 32} and {8, 4, 24}.

[0082] However, it is also possible to consider a case where only common hardware with a certain budget (certain budget) is used in CSI calculations for all bands in one UE. In such a case, it is also possible to consider a case where the capability that the UE can actually handle when combining bands is lower than the above (for example, {16, 1, 16}, {8, 2, 12}).

[0083] Generally, codebook-related parameters are reported for each band, so CSI processing capability is not shared between bands supported by the UE. Therefore, if the UE reports codebook-related parameters (e.g., maxNumberResourcesPerBand and totalNumberTxPortsPerBand) for each band without considering the combination of bands, CSI-RS resources / ports exceeding the UE's capability may be set when combining bands.

[0084] As a method to avoid such a situation, it is considered to report (underreport) a value lower than the actual UE capability as the value reported by the UE for each band. That is, the UE assumes that when assuming a combination of multiple bands, the value of the parameter / triplet related to the codebook reported for each band is reduced (under-evaluated).

[0085] For example, the UE considers under-reporting of codebook-related parameters (eg, FG2-36 / 2-40 / 2-41 / 2-43) / triplets for band A and band B as follows.

[0086] Band A: {4,1,4}

[0087] Band B: {4,1,4}

[0088] In the case where the UE reports too little, the number of CSI-RS resources / ports scheduled from the network is also set to be less when using one band (applying the single-band mode). Therefore, when the UE applies the single-band mode, the CSI-RS resources / ports are set to be less than the UE capability, which may cause a concern about the degradation of communication quality.

[0089] Therefore, it is considered that the UE reports specific parameters related to the CSI processing capability taking into account the band combination. For example, as described above, the UE reports a parameter corresponding to the maximum number of CSI-RS resources in all CCs / activated BWPs (e.g., maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC) and a parameter corresponding to the total number of ports of CSI-RS resources in all CCs / activated BWPs (e.g., totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC) for each band combination (BC).

[0090] For example, a study is underway to report codebook-related parameters (eg, FG2-36 / 2-40 / 2-41 / 2-43) / BC-related specific parameters (eg, FG2-33) in the case of a triplet for band A and band B as follows.

[0091] Band A: {16,1,16}, {8,2,12}

[0092] Band B: {16,1,16}, {8,2,12}

[0093] <Scenario 1>

[0094] It is assumed that the UE reports {2, 16} as the specific parameters {maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC, totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC} related to the band combination (e.g., band A+B).

[0095] In this case, the NW can set one CSI-RS resource corresponding to 8 ports for band A (or one 8-port CSI-RS resource), and one CSI-RS resource corresponding to 8 ports for band B. However, two CSI-RS resources corresponding to 8 ports (or two CSI reports with 8-port CSI-RS resources) cannot be set for each band.

[0096] This is because the maximum number of CSI-RS resources in BC is limited to 2. In addition, when two CSI-RS resources are set for only one band, since the total number of ports is limited to 12, two 8-port CSI-RS cannot be set for one band.

[0097] In addition, regarding the report of each band, when it is always interpreted as each band, 8 ports (band A) + 8 ports (band B) can be set. However, in this case, the UE needs to process 16-port CSI-RS in two bands. UEs that share a CSI processing unit between bands have the same CSI processing capabilities both within and between bands. Therefore, assuming that {x, 2, 12} is reported for each band, even if there are multiple bands, a maximum of 12 ports can only be processed for a total of two CSI-RS. Therefore, in order to avoid being set with 16-port CSI-RS in two bands as described above, the UE reports too little for each band, such as {x, 2, 6}.

[0098] <Scenario 2>

[0099] Assume that the UE reports {1, 16} as a specific parameter related to a band combination (eg, band A+B).

[0100] In this case, the number of CSI-RS resources set simultaneously in band A and band B is limited to one. Therefore, if a periodic CSI-RS is set in any one band, CSI reporting is not supported in the other band. In order to support CSI reporting in both bands, it is necessary to set non-periodic CSI-RS that do not overlap in the time direction in both bands. However, in this case, it is also necessary to control so that the non-periodic CSI-RS in the two bands are not activated at the same time.

[0101] <Scenario 3>

[0102] Assume that the UE reports {2, 12} as a specific parameter related to a band combination (eg, band A+B).

[0103] In this case, one CSI-RS resource can be set in each band, and 4 ports can be set for one band and 8 ports can be set for the other band. Figure 5 In addition, by shifting the non-periodic CSI-RS in the time direction between band A and band B (TDM), it is possible to set a CSI-RS resource corresponding to 12 ports in each band ( Figure 5 Settings 3).

[0104] In case 3, the total number of ports in BC is limited to 12. Therefore, in one band (band A / B), even if multiple CCs in only a single band become activated, one CSI-RS resource and 16 ports (16-port CSI-RS resource) are not supported in inter-band CA.

[0105] Thus, in the existing reporting method, a specific parameter related to a band combination is reported (for example, a common specific parameter is reported for different CSI types). However, in such a reporting method, there is a concern that the number of CSI-RS resources / ports set for each band cannot be appropriately set.

[0106] In order to solve such a problem, it is considered to report a plurality of parameters (or a combination of parameters) as specific parameters related to the band combination (for example, FG2-33).

[0107] For example, consider that the UE reports one or more combinations of the maximum number of CSI-RS resources (e.g., maxNumberResourcesPerBC) and the total number of ports (e.g., totalNumberTxPortsPerBC) per BC / per CSI codebook type (see Figure 6 (A) Figure 6(B)). The combination of the maximum number of CSI-RS resources and the total number of ports may also be {maxNumberResourcesPerBC,totalNumberTxPortsPerBC}, or {maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC,totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC}.

[0108] Figure 6 (A) shows a reporting method of an existing system for reporting a specific parameter, Figure 6 (B) shows a reporting method for reporting multiple specific parameters (also called updated FG2-33 or extended FG2-33).

[0109] exist Figure 6 In (B), the UE reports codebook-related parameters (e.g., FG2-36 / 2-40 / 2-41 / 2-43) / triplets for band A and band B as follows.

[0110] Band A: {16,1,16}, {8,2,12}

[0111] Band B: {16,1,16}, {8,2,12}

[0112] Furthermore, the case where two specific parameters (eg, update FG2-33) / lists related to BC are reported as follows is shown. Of course, the combination reported is not limited to two, and may be three or more.

[0113] Band A+B: {1,16}, {2,12}

[0114] In this way, by reporting a plurality of parameters (or a combination of parameters) as specific parameters related to BC (for example, FG2-33), the number of resources and the number of ports for each BC can be appropriately set, thereby preventing insufficient reporting by UE.

[0115] On the other hand, even when reporting a combination of the maximum number of CSI-RS resources per BC (e.g., maxNumberResourcesPerBC) and the total number of ports (e.g., totalNumberTxPortsPerBC), there is a concern that the number of resources / ports may be set to exceed the UE capability.

[0116] For example, assume that the UE reports the following list as a parameter / triplet ({maxNumberTxPortsPerResource, maxNumberResourcesPerBand, totalNumberTxPortsPerBand}) for band A and band B.

[0117] Band A: {8,6,48}, {16,2,32}

[0118] Band B: {8,6,48}, {16,2,32}

[0119] Furthermore, it is envisaged that the UE reports the following values ​​as specific parameters (eg, update FG2-33) / list related to BC ({maxNumberResourcesPerBC, totalNumberTxPortsPerBC}).

[0120] Band A+B: {6,48}, {2,32}

[0121] However, when {6, 48} or {2, 32} is reported for BC (here, band A+B), it is considered that the following configuration may be set (for 3 resources, a total of 48 ports).

[0122] Band A: 16 ports + 16 ports (2 resources)

[0123] Band B: 16 ports (1 resource)

[0124] This is because {16, 2, 32} is satisfied for band A, {16, 2, 32} is satisfied for band B, and {6, 48} is satisfied for band A+B (FG2-33) (i.e., 3 resources are set simultaneously in band A+B and the total number of ports is 48 or less). However, such a structure may exceed the UE capability.

[0125] Therefore, consider that the UE also reports the maximum number of ports per resource (e.g., maxNumberTxPortsPerResource, or maxNumberTxPortsPerResourceperBC) for BC (or for each BC). However, when the maximum number of ports per resource (e.g., maxNumberTxPortsPerResource), the maximum number of CSI-RS resources (e.g., maxNumberResourcesPerBC), and the total number of ports (e.g., totalNumberTxPortsPerBC) are also reported for BC (or for each BC), there is a concern that the overhead of the reported signaling increases.

[0126] (UE capability query for CSI reporting)

[0127] In order to reduce the overhead of reporting UE capability information related to CSI, it is considered that the network notifies the UE of a UE capability query (e.g., UECapabilityEnquiry) (or UE-capabilityRequestFilter, CodebookParameterFilter). The UE may also limit the value of the reported CSI parameter (or CSI codebook parameter) based on the notification from the network.

[0128] For example, the UE may also limit a combination of parameters (for example, a triplet) reported per band or a combination of parameters reported per BC based on information (for example, UECapabilityEnquiry) from the network.

[0129] For example, the network may also use the value of at least a part of the CSI codebook parameters (e.g., the number of transmission ports, the number of resources, etc.) as a UE capability query, and the UE may also control not to report UE capability information exceeding the notified value. For example, in the case where the network only supports a maximum of X ports, reporting of UE capability information related to the number of transmission ports exceeding X is unnecessary for the network, and thus the reporting overhead can be suppressed by limiting the value reported from the UE.

[0130] The network may also include information related to codebook parameters (e.g., CodebookParameterFilter) in the UE capability query and notify the UE (see Figure 7). CodebookParameterFilter may also include at least one of information related to the maximum number of transmit ports (e.g., maxNumberTxPorts), information related to the maximum number of transmit ports per resource (e.g., maxNumberTxPortsPerResource), and information related to the maximum number of resources per band (e.g., maxNumberResourcePerBand).

[0131] In addition, CodebookParameterFilter may also include information related to the maximum number of CSI-RS resource lists (eg, maxNumberCSI-RS-ResourceList) and information related to the requested codebook type (eg, requestedCodebookTypes).

[0132] The information related to the maximum number of transmit ports (eg, maxNumberTxPorts) may also be a codebook parameter that limits the UE to report (see Figure 7 ) contains a value for the total number of transmit ports per band (e.g., totalNumberTxPortsPerBand).

[0133] The information related to the maximum number of transmit ports per resource (eg, maxNumberTxPortsPerResource) may also be a codebook parameter that limits the UE to report (see Figure 7 ) contains a filter for the value of the maximum number of transmit ports per resource (e.g., maxNumberTxPortsPerResource).

[0134] The information related to the maximum number of resources per band (eg, maxNumberResourcePerBand) may also be a codebook parameter that limits the UE to report (see Figure 7 ) contains the value of the maximum number of resources per band (maxNumberResourcePerBand).

[0135] The information related to the maximum number of CSI-RS resource lists (eg, maxNumberCSI-RS-ResourceList) may also be a codebook parameter that limits the UE to report (see Figure 7 ) contains a filter based on the number of entries in the supported CSI-RS resource list (e.g., supportedCSI-RS-ResourceList).

[0136] The information related to the requested codebook type (e.g., requestedCodebookTypes) may also be information that limits the codebook parameters reported by the UE (see Figure 7 ) contains filters of type (type).

[0137] When receiving a UE capability query including CodebookParameterFilter, the UE may also control so that a value smaller than the value indicated by the CodebookParameterFilter is reported in the codebook parameter reported by the UE.

[0138] For example, when CodebookParameterFilter includes information related to the maximum number of transmission ports (e.g., maxNumberTxPorts), the UE includes in the codebook parameter SupportedCSI-RS-Resource reporting when totalNumberTxPortsPerBand becomes smaller than the value notified by CodebookParameterFilter (e.g., maxNumberTxPorts).

[0139] In addition, when CodebookParameterFilter includes information related to the maximum number of transmission ports for each resource (e.g., maxNumberTxPortsPerResource), the UE includes maxNumberTxPortsPerResource in the codebook parameter and reports SupportedCSI-RS-Resource that becomes smaller than the value notified by CodebookParameterFilter (e.g., maxNumberTxPortsPerResource).

[0140] In addition, when CodebookParameterFilter includes information related to the maximum number of resources per band (e.g., maxNumberResourcePerBand), the UE includes SupportedCSI-RS-Resource in the codebook parameter when maxNumberResourcePerBand becomes smaller than the value notified by CodebookParameterFilter (e.g., maxNumberResourcePerBand) and reports it.

[0141] In this way, the network's assumed value (e.g., the maximum value of UE capability information) can be notified to the UE for each parameter (e.g., maxNumberTxPorts, maxNumberTxPortsPerResource, maxNumberResourcePerBand), and the UE can control the report so as not to exceed the notified value. This can reduce the UE's reporting overhead.

[0142] On the other hand, the report value included in the codebook parameter reported by the UE for each band (for example, the report value of each CSI type) is composed of at least one triplet. For example, the UE may also report the following triplet for band A. In addition, the following value is an example and is not limited to this.

[0143] Band A: {16,1,16}, {8,2,12}

[0144] In other words, the UE reports various parameters for band A as follows.

[0145] <Triple #1>

[0146] maxNumberTxPortsPerResource=16

[0147] maxNumberResourcePerBand=1

[0148] totalNumberTxPortsPerBand=16

[0149] <Triple #2>

[0150] maxNumberTxPortsPerResource=8

[0151] maxNumberResourcePerBand=2

[0152] totalNumberTxPortsPerBand=12

[0153] Here, it is assumed that the following values ​​are notified from the network as a UE capability inquiry (e.g., UECapabilityEnquiry) or CodebookParameterFilter.

[0154] maxNumberTxPortsPerResource=10

[0155] maxNumberResourcePerBand=2

[0156] maxNumberTxPorts(or totalNumberTxPortsPerBand)=16

[0157] In this case, the maximum number of transmit ports per resource in triple #1 (maxNumberTxPortsPerResource) becomes larger than the value notified from the network. If reporting is controlled based on UE capability query, triple #1 {16,1,16} is not reported, and only triple #2 {8,2,12} is reported (refer to Figure 8 ).

[0158] However, the inventors of the present invention noticed that, from the network's perspective, when triplet #1 {16,1,16} is reported from the UE, since it can be determined that the network's capability limit of {10,1,16} can be set to the UE at a maximum, the reporting of triplet #1 is useful to the network.

[0159] Therefore, the inventors of the present invention studied the content / value of reporting based on the UE capability query (for example, UECapabilityEnquiry) or CodebookParameterFilter notified from the network when reporting in combination of multiple parameters, and conceived of the present embodiment.

[0160] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods and methods involved in each embodiment can be applied separately or in combination. In addition, in the present disclosure, "A / B" can also be replaced by "at least one of A and B".

[0161] In the following description, port, CSI-RS port, and CSI-RS resource port may be interchanged. In addition, each band combination (BC) may be set for each BC or for each CSI codebook type.

[0162] In the following description, the maximum number of CSI-RS resources (e.g., maxNumberResourcesPerBC) and the maximum number of CSI-RS resources in all CCs / activated BWPs (e.g., maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC) may also be replaced with each other. The total number of ports (e.g., totalNumberTxPortsPerBC) and the total number of ports of CSI-RS resources in all CCs / activated BWPs (e.g., totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC) may also be replaced with each other.

[0163] In the following description, UE capability inquiry (e.g., UECapabilityEnquiry) can also be replaced by UE capability RAT request list (e.g., UE-CapabilityRAT-RequestList), UE capability RAT request (e.g., UE-CapabilityRAT-Request), capabilityRequestFilter, UE-CapabilityRequestFilterNR, or CodebookParameterFilter.

[0164] (First method)

[0165] In the first aspect, when reporting a combination of a plurality of parameters, if all elements of the combination are greater than the values ​​notified from the network, the combination is not reported or is not requested to be reported.

[0166] In the following description, as a combination / list of multiple parameters reported by the UE, a combination (e.g., a triplet) of the maximum number of transmit ports per resource (e.g., maxNumberTxPortsPerResource), the maximum number of resources per band (e.g., maxNumberResourcePerBand), and the total number of transmit ports per band (e.g., totalNumberTxPortsPerBand) is listed as an example for description, but the present invention is not limited thereto. It is also possible to report a combination of two of the three parameters.

[0167] In the following description, the UE capability reported for each band is taken as an example for description, but it can also be applied to the UE capability reported for each BC / each CSI type.

[0168] When reporting a combination of multiple parameters (maxNumberTxPortsPerResource, maxNumberResourcePerBand, totalNumberTxPortsPerBand), the UE may also control the reporting of the combination when at least one of the parameters (or elements) of the combination is less than a specific value (or less than a specific value) notified from the network. In the case of a parameter whose specific value is not notified from the network, the UE may also control the reporting of the combination.

[0169] The specific value notified from the network may also be notified through a UE capability query (e.g., UECapabilityEnquiry). The specific value notified from the network may also include at least one of a value related to the maximum number of transmit ports (e.g., maxNumberTxPorts), a value related to the maximum number of transmit ports per resource (e.g., maxNumberTxPortsPerResource), and a value related to the maximum number of resources per band (e.g., maxNumberResourcePerBand).

[0170] For example, it is assumed that the UE wants to report the following triplet for band A. The following values ​​are examples and are not limited thereto.

[0171] Band A: {16,1,16}, {8,2,12}

[0172] In other words, the UE reports various parameters for band A as follows.

[0173] <Triple #1>

[0174] maxNumberTxPortsPerResource=16

[0175] maxNumberResourcePerBand=1

[0176] totalNumberTxPortsPerBand=16

[0177] <Triple #2>

[0178] maxNumberTxPortsPerResource=8

[0179] maxNumberResourcePerBand=2

[0180] totalNumberTxPortsPerBand=12

[0181] Here, it is assumed that the following values ​​are notified from the network as a UE capability inquiry (e.g., UECapabilityEnquiry) or CodebookParameterFilter.

[0182] maxNumberTxPortsPerResource=10

[0183] maxNumberResourcePerBand=2

[0184] maxNumberTxPorts(or totalNumberTxPortsPerBand)=16

[0185] In this case, the maximum number of transmit ports per resource in triple #1 (maxNumberTxPortsPerResource) becomes larger than the value notified from the network. On the other hand, the values ​​of other parameters (maxNumberResourcePerBand, totalNumberTxPortsPerBand) in triple #1 become less than (not greater than) the values ​​notified from the network. Therefore, the UE may also be allowed to report both triple #1 {16,1,16} and triple #2 {8,2,12} (refer to Fig. 9 ).

[0186] As a result, from the perspective of the network, the values ​​of some parameters included in the combination reported from the UE can be applied (or set to the UE), so by reporting the combination to the network, the communication quality can be improved.

[0187] In addition, Fig. 9 In the case of reporting triplet #1, the UE may also modify the value of some parameters (e.g., parameters exceeding the value notified from the network) and report it. For example, the UE may also modify the maxNumberTxPortsPerResource in triplet #1 to the value notified from the network (here {10,1,16}) and report it.

[0188] In addition, when reporting a combination of multiple parameters (maxNumberTxPortsPerResource, maxNumberResourcePerBand, totalNumberTxPortsPerBand), the UE may also apply at least one of the following UE operations 1 to 4 when all parameters (or all elements) of the combination are greater than the value notified from the network. In the case where there is a parameter whose specific value is not notified from the network, the parameter may also be removed from all elements.

[0189] <UE operation 1>

[0190] When the values ​​of all parameters (e.g., X1, Y1, Z1) included in the combination scheduled to be reported (e.g., triple #A) are greater than the values ​​(e.g., X, Y, Z) notified from the network (e.g., X1>X, Y1>Y, Z1>Z), the UE may also control not to report the combination (see Fig.10). In this case, from the network's perspective, it is not possible to use the values ​​of all parameters included in the combination of scheduled reports. Therefore, by controlling not to report the combination, it is possible to suppress the increase in the UE's reporting overhead.

[0191] <UE Operation 2>

[0192] It may also be configured such that, when the values ​​of all parameters included in a combination (e.g., a triplet) to be reported are greater than the values ​​notified from the network, the UE is not requested (or expected) to report the combination. In this case, reporting of the combination may also be permitted according to the implementation of the UE.

[0193] <UE operation 3>

[0194] When the values ​​of all parameters (e.g., X1, Y1, Z1) included in the combination to be reported (e.g., triple #A) are greater than the values ​​(e.g., X, Y, Z) notified from the network (e.g., X1>X, Y1>Y, Z1>Z), the UE may also report the values ​​of the parameters included in the combination after modifying them (see Fig.11 ). For example, the UE may also modify the value of each parameter included in the combination to a value not exceeding the value notified from the network. The UE may modify the values ​​of all parameters included in the combination or only modify the values ​​of some parameters.

[0195] This allows the network to set the number of resources / transmission ports using the values ​​of the parameters included in the combination reported from the UE.

[0196] <UE Operation 4>

[0197] In the case where the values ​​of all parameters included in the combination (e.g., triplet) to be reported are greater than the values ​​notified from the network, the UE may not report the combination, but report the content (all parameters included in the combination exceed the values ​​notified from the network) to the network. In this case, the UE can use fewer bits (e.g., 1 bit) to notify the network, thereby suppressing the increase in the UE's reporting overhead.

[0198] (Second method)

[0199] In the second embodiment, the application conditions of the UE operation (at least one of the UE operations 1 to 4) in the first embodiment are described.

[0200] In Rel. 15, since the triplet is reported per band, there is a case where the UE reports too few reported triplet values. Therefore, in Rel. 16 and later, it is assumed that the UE reports multiple triplets per band and per BC.

[0201] That is, it is assumed that the UE reports at least one of the following report contents #A to #C (hereinafter referred to as reports #A to #C).

[0202] Report #A: Triplet corresponding to Rel.15 (per band field)

[0203] Report #B: New triples corresponding to Rel.16 and later (per band domain)

[0204] Report #C: New triples corresponding to Rel.16 and later (per BC)

[0205] Base stations corresponding to Rel. 15 recognize only Report #A. Base stations corresponding to Rel. 16 may assume that only Report #A is recognized and the value reported is underreported, or may assume report values ​​of Report #B and Report #C, or may assume a value greater than Report #A.

[0206] It is also possible to set a structure in which the UE operation in the first embodiment is applied to report #B and report #C, but not to report #A. Thus, when the structure in which the value of the parameter related to the triplet is included in the UE capability query (for example, UECapabilityEnquiry) is supported from Rel.16, the UE operation in the first embodiment can be applied without affecting the operation of Rel.15.

[0207] Alternatively, the UE operation in the first embodiment may be applied to all of Report #A, Report #B, and Report #C.

[0208] (Variation 1)

[0209] The UE may also be instructed / configured by the network whether to report at least one of Report #A to Report #C. For example, the network may instruct / configure the UE whether to report at least one of Report #A to Report #C using a UE capability query (eg, UECapabilityEnquiry).

[0210] A UE (e.g., a UE supporting Rel.16) that has not been instructed / configured by the network (e.g., through UE capability query) regarding the presence or absence of reports related to Report #A to Report #C may also report Report #A, Report #B, and Report #C respectively.

[0211] On the other hand, a UE (e.g., a UE supporting Rel.16) that is notified from the network (e.g., through UE capability inquiry) that Report #B and Report #C are not required can also be controlled so as not to report Report #B and Report #C. This can suppress the increase in the UE's reporting overhead. Alternatively, the UE is not requested / expected to report Report #B and Report #C. In this case, Report #B / Report #C can also be reported by the UE.

[0212] Alternatively, a UE (for example, a UE supporting Rel.16) that has not been instructed / set by the network (for example, through UE capability inquiry) to report #A to #C may be controlled to report only report #A. In a network where reporting only report #A is sufficient (a network where underreporting is not a big problem), such control can suppress the increase in UE reporting overhead. As a result, the resource size of the PUSCH used in sending UE capabilities can be reduced, thereby improving resource utilization efficiency. In addition, a network where underreporting is not a big problem may be, for example, a network where the number of transmit ports / resources that can be set is small (for example, below a specific value).

[0213] On the other hand, a UE (e.g., a UE supporting Rel.16) that has been requested to report Report #B and Report #C from the network (e.g., through UE capability inquiry) may also be controlled to report Report #B and Report #C in addition to Report #A. Alternatively, the UE may be controlled not to report Report #B / Report #C.

[0214] (Variation 2)

[0215] It is also considered to further report triplets for type 2 CSI codebook (eg, Rel. 16-type 2 CSI codebook). Type 2 CSI may also not be advantageous for multi-beam selection.

[0216] In this case, the first method / variation 1 may also be applied to the type 2 CSI codebook. The network may indicate / set the necessity of reporting the triplet for the type 2 CSI codebook to the UE (for example, through UE capability inquiry), and the UE may control the reporting of the triplet based on the indication / setting from the network.

[0217] A UE that is notified that reporting on a triplet for the type 2 CSI codebook is not necessary (or is not instructed / configured to report) may not report the triplet, but may report whether the type 2 CSI codebook is supported (for example, by reporting using 1 bit).

[0218] It may also be configured such that a UE that reports the content of supporting the type 2 CSI codebook and does not report a triplet supports a specific triplet. The specific triplet may be defined in the specification or determined based on the report value of other CSI codebooks.

[0219] For example, a specific triplet may be selected from one or more triplet(s) included in a list of triplet(s) corresponding to the type 1 CSI codebook (Rel.15 or Rel.16). For example, the first triplet or the last triplet(s) included in the list may be selected as a specific triplet. Alternatively, a triplet in which at least one parameter (or element) becomes a minimum value may be selected as a specific triplet.

[0220] The triplet corresponding to the type 2 CSI codebook may also be a structure including more parameters (or elements) than the triplet corresponding to other CSI codebooks (e.g., type 1 CSI codebook). For example, the triplet corresponding to the type 2 CSI codebook may also be a structure including four parameters (or four elements).

[0221] For example, the triplet corresponding to the type 2 CSI codebook may also be a structure in which R (R=1 or 2) is added to the three parameters / elements (maxNumberTxPortsPerResource, maxNumberResourcePerBand, totalNumberTxPortsPerBand). R may also be a value indicating the association between the PMI subband size / number and the CQI subband size / number. In the case of R=1, it may also indicate that the PMI subband size / number is equal to the CQI subband size / number. In the case of R=2, it may also indicate that the relationship between the PMI subband size / number and the CQI subband size / number is 1:2 (the size of one subband is half the size of the other subband).

[0222] (Wireless Communication System)

[0223] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0224] Fig.121 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0225] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0226] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0227] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0228] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0229] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0230] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0231] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0232] Multiple base stations 10 may also be connected via wired (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0233] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also 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.

[0234] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0235] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0236] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0237] As downlink channels, the wireless communication system 1 may use 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.

[0238] In addition, as uplink channels, 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)) and the like can also be used in the wireless communication system 1.

[0239] User data, high-layer control information, system information block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, master information block (MIB) can also be transmitted through PBCH.

[0240] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0241] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be replaced by DL data, and the PUSCH may also be replaced by UL data.

[0242] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0243] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0244] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted through PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted through PRACH.

[0245] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0246] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0247] 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 SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0248] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0249] (Base Station)

[0250] Fig.13 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0251] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0252] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0253] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0254] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are explained based on the common knowledge in the technical field involved in the present disclosure.

[0255] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0256] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0257] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0258] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0259] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0260] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0261] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0262] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filtering, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0263] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0264] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0265] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0266] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0267] The transmitting and receiving unit 120 may also transmit the terminal capability inquiry information including at least one of information on the maximum number of transmission ports per resource, information on the maximum number of resources, and information on the total number of transmission ports.

[0268] In the case where a combination of the maximum number of sending ports for each resource, the maximum number of resources, and the total number of sending ports is reported from the terminal as terminal capabilities, the control unit 110 may also assume that at least one of the maximum number of sending ports for each resource, the maximum number of resources, and the total number of sending ports is smaller than the value notified by the query information.

[0269] (User Terminal)

[0270] Fig.142 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided in one or more pieces.

[0271] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0272] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0273] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0274] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0275] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0276] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0277] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0278] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0279] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0280] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0281] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0282] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0283] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filtering, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0284] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0285] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also 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 also be output to the control unit 210.

[0286] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0287] The sending and receiving unit 220 may also receive inquiry information about terminal capabilities including at least one of information related to a first parameter (e.g., the maximum number of sending ports for each resource), information related to a second parameter (e.g., the maximum number of resources), and information related to a third parameter (e.g., the total number of sending ports).

[0288] In the case where a combination of a first parameter (e.g., the maximum number of sending ports for each resource), a second parameter (e.g., the maximum number of resources), and a third parameter (e.g., the total number of sending ports) is reported as terminal capabilities, the control unit 210 may also control the report to be combined when at least one of the maximum number of sending ports for each resource, the maximum number of resources, and the total number of sending ports is less than a value notified through the query information.

[0289] When the maximum number of transmission ports per resource in the combination, the maximum number of resources, and the total number of transmission ports are all greater than the values ​​notified by the inquiry information, the control unit 210 may control not to report the combination.

[0290] When the maximum number of sending ports for each resource in the combination, the maximum number of resources, and the total number of sending ports are all greater than the values ​​notified through the query information, the control unit 210 may also control to change at least one of the maximum number of sending ports for each resource, the maximum number of resources, and the total number of sending ports and report it.

[0291] When the maximum number of transmission ports of each resource in the combination, the maximum number of resources, and the total number of transmission ports are all greater than the values ​​notified by the inquiry information, the control unit 210 may control to report this fact.

[0292] (Hardware Structure)

[0293] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0294] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0295] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.15 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0296] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be used interchangeably. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of the devices shown in the figure, or to exclude some of the devices.

[0297] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0298] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0299] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0300] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0301] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0302] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0303] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0304] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0305] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0306] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0307] (Variation Example)

[0308] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0309] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0310] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filtering process performed by a transmitter and receiver in the frequency domain, a specific windowing process performed by a transmitter and receiver in the time domain, and the like.

[0311] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0312] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0313] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0314] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0315] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0316] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when 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.

[0317] In addition, when a time slot or a mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0318] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0319] In addition, a long TTI (e.g., normal TTI, subframe, etc.) may be replaced by a TTI having a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) may be replaced by a TTI having a TTI length shorter than that of the long TTI and longer than 1 ms.

[0320] 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 (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0321] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0322] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0323] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0324] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, common RBs may also be identified by the index of the RB relative to the common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0325] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0326] At least one of the configured BWPs may be activated, and the UE may not assume that it transmits or receives a specific signal / channel other than the activated BWP. In addition, the "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0327] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0328] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0329] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0330] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0331] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0332] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0333] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0334] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0335] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0336] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0337] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0338] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0339] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0340] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0341] In the present disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0342] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0343] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0344] There are also cases where a mobile station is 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, hand set, user agent, mobile client, client or some other appropriate terminology.

[0345] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device carried in a mobile body, a mobile body, etc. The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0346] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0347] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0348] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node (uppernode) depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, considering the Mobility Management Entity (MME)), the Serving-Gateway (S-GW), etc., but not limited to these) or a combination thereof.

[0349] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0350] The various modes / implementations described in the present disclosure may also be applied to 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)) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems expanded based on them. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0351] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0352] The term "determining" used in this disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (for example, searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0353] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0354] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0355] In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and so on.

[0356] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be replaced by "access".

[0357] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0358] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0359] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0360] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0361] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

[0362] This application is based on Japanese Patent Application No. 2020-080376 filed on April 30, 2020, the entire contents of which are incorporated herein by reference.

Claims

1. A terminal having: a receiving unit, receiving information related to the query of capability information; and a control unit that reports at least the first information related to CSI-RS resources of one or more codebook types for each band corresponding to Rel.15, second information related to CSI-RS resources of one or more codebook types for each band corresponding to Rel.16 or later, and third information related to CSI-RS resources of one or more codebook types for each band combination corresponding to Rel.16 or later, and determines whether to report the second information and the third information based on the information related to the query, The control unit determines whether to report the second information and the third information related to the CSI-RS resources for the type 2 CSI codebook based on the information related to the query.

2. A wireless communication method, which is a wireless communication method of a terminal, comprising: The step of receiving information related to the query of capability information; A step of reporting at least the first information related to CSI-RS resources of one or more codebook types for each band corresponding to Rel.15, second information related to CSI-RS resources of one or more codebook types for each band corresponding to Rel.16 or later, and third information related to CSI-RS resources of one or more codebook types for each band combination corresponding to Rel.16 or later, and judging whether to report the second information and the third information based on the information related to the query; and A step of determining whether to report the second information and the third information related to the CSI-RS resources for the type 2 CSI codebook based on the information related to the query.

3. A base station, comprising: A sending unit, sending information related to the query of capability information; a receiving unit, receiving a report of at least the first information related to CSI-RS resources of one or more codebook types for each band corresponding to Rel.15, second information related to CSI-RS resources of one or more codebook types for each band corresponding to Rel.16 or later, and third information related to CSI-RS resources of one or more codebook types for each band combination corresponding to Rel.16 or later; as well as a control unit, instructing reporting of the second information and the third information based on information related to the query, The control unit instructs reporting of the second information and the third information related to CSI-RS resources for a type-2 CSI codebook based on the information related to the query.

4. A system comprising a terminal and a base station, The terminal has: A receiving unit, receiving information related to the query of capability information; as well as a control unit that reports at least the first information related to CSI-RS resources of one or more codebook types for each band corresponding to Rel.15, second information related to CSI-RS resources of one or more codebook types for each band corresponding to Rel.16 or later, and third information related to CSI-RS resources of one or more codebook types for each band combination corresponding to Rel.16 or later, and determines whether to report the second information and the third information based on the information related to the query, The control unit determines, based on the information related to the query, whether to report the second information and the third information related to the CSI-RS resources for the type 2 CSI codebook, The base station has: A sending unit, sending information related to the query of the capability information; a receiving unit, receiving a report of at least the first information; as well as The control unit instructs reporting of the second information and the third information based on information related to the query.

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