Terminal, wireless communication method, and base station

Abstract

Communication using information related to a channel state information reference signal reported from a terminal is appropriately performed. A terminal according to an aspect of the present disclosure includes a control unit that controls reporting of a plurality of first information related to a combination of a channel state information resource for a band combination and a number of ports for the band combination and second information related to a number of ports for each channel state information resource for the band combination, and a transmission unit that transmits the first information and the second 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

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is specified for the purpose of further high-speed data rates, low latency, and so on (Non-Patent Literature 1). Further, LTE-Advanced (3GPP Rel. 10-14) is specified for the purpose of further larger capacity, higher degree of integration, and so on than LTE (3rd Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] A subsequent system of LTE (for example, also referred to as a 5th generation mobile communication system (5G), 5G (plus), New Radio (NR), 3GPP Rel. 15 onwards, and so on) is also discussed.

[0004] PRIOR ART DOCUMENTS

[0005] NON-PATENT LITERATURE

[0006] Non-Patent Literature 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

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In Rel. 15 NR, UE capability information related to resources / ports of a reference signal (for example, CSI-RS) for Channel State Information (CSI) is supported to be reported from a UE to a network.

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

[0010] However, how the setting of the number of CSI-RS resources / number of ports is controlled based on the information (or, parameters) reported from the UE has not been sufficiently discussed. There is a concern that the communication quality deteriorates when the capability information on the number of CSI-RS resources / number of ports reported from the UE is inappropriate, or when appropriate CSI-RS transmission cannot be performed based on the capability information reported from the UE.

[0011] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station capable of appropriately performing communication using information on a channel state information reference signal reported from a terminal.

[0012] Means for solving the problem

[0013] The terminal according to the aspect of the present disclosure is characterized by including a control unit that controls reporting of a plurality of first information on a combination of a channel state information resource for a band combination and a number of ports for the band combination, and second information on a number of ports for each channel state information resource for the band combination, and a transmission unit that transmits the first information and the second information.

[0014] Effects of the Invention

[0015] According to the aspect of the present disclosure, it is possible to appropriately perform communication using information on a channel state information reference signal reported from a terminal. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a diagram showing an example of existing parameters reported by a UE in relation to CSI-RS.

[0017] Figure 2 is a diagram showing another example of existing parameters reported by a UE in relation to CSI-RS.

[0018] Figure 3 is a diagram showing an example of an activation period of CSI-RS.

[0019] Figure 4 is a diagram showing an example of the setting of CSI-RS resources / ports for a frequency band A / frequency band B.

[0020] Figure 5A and Figure 5B is a diagram representing an example of the report of the number of CSI-RS resources / number of ports involved in the first method.

[0021] Figure 6A and Figure 6B is a diagram representing an example of the parameters related to CSI-RS reported by the UE.

[0022] Figure 7A and Figure 7B is a diagram representing another example of the parameters related to CSI-RS reported by the UE.

[0023] Figure 8 is a diagram representing another example of the report of the number of CSI-RS resources / number of ports involved in the first method.

[0024] Figure 9 is a diagram representing an example of the number of CSI-RS resources / number of ports and parameters involved in the first method.

[0025] Figure 10 is a diagram representing another example of the number of CSI-RS resources / number of ports and parameters reported by the UE involved in the first method.

[0026] Figure 11 is a diagram representing another example of the number of CSI-RS resources / number of ports reported by the UE involved in the first method.

[0027] Figure 12 is a diagram representing another example of the number of CSI-RS resources / number of ports and parameters reported by the UE involved in the first method.

[0028] Figure 13 is a diagram representing another example of the number of CSI-RS resources / number of ports and parameters reported by the UE involved in the first method.

[0029] Figure 14 is a diagram representing another example of the number of CSI-RS resources / number of ports reported by the UE involved in the first method.

[0030] Figure 15 is a diagram representing another example of the number of CSI-RS resources / number of ports reported by the UE involved in the first method.

[0031] Figures 16A to 16D is a diagram illustrating multiple cases of the number of CSI-RS resources / number of ports reported by the UE.

[0032] Figure 17 is a diagram representing an example of the number of CSI-RS resources / number of ports reported by the UE involved in the second method.

[0033] Figure 18 FIG. 6 is a diagram representing another example of the CSI-RS resource quantity / port quantity reported by the UE involved in the second method.

[0034] Figure 19 FIG. 7 is a diagram representing an example of the CSI-RS resource quantity / port quantity reported by the UE involved in the fourth method.

[0035] Figure 20 FIG. 8 is a diagram representing an example of the port quantity per CSI resource quantity / CSI-RS resource quantity / port quantity reporting for BC involved in the fifth method.

[0036] Figure 21 FIG. 9 is a diagram representing an example of the port quantity per CSI resource quantity / CSI-RS resource quantity / port quantity reporting for BC involved in the sixth method.

[0037] Figure 22 FIG. 10 is a diagram representing an example of the outline structure of a wireless communication system involved in an embodiment.

[0038] Figure 23 FIG. 11 is a diagram representing an example of the structure of a base station involved in an embodiment.

[0039] Figure 24 FIG. 12 is a diagram representing an example of the structure of a user terminal involved in an embodiment.

[0040] Figure 25 FIG. 13 is a diagram representing an example of the hardware structure of a base station and a user terminal involved in an embodiment. DETAILED DESCRIPTION

[0041] (CSI report (or reporting))

[0042] In Rel. 15 NR, a terminal (also referred to as a user terminal, User Equipment (UE), etc.) generates (also referred to as decides, calculates, estimates, measures, etc.) channel state information (CSI) based on a reference signal (RS) (or a resource for the RS), and transmits (also referred to as reports, feeds back, etc.) the generated CSI to a network (for example, a base station). The CSI can be transmitted to the base station, for example, using an uplink control channel (for example, a Physical Uplink Control Channel (PUCCH)) or an uplink shared channel (for example, a Physical Uplink Shared Channel (PUSCH)).

[0043] The RS utilized in the generation of the CSI can be at least one of, for example, a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), a DeModulation Reference Signal (DMRS), and the like.

[0044] The CSI-RS can 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 can also be referred to as an SS block (SSB), and the like. Also, the SS can include at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).

[0045] The CSI can also contain at least one of parameters (CSI parameters) of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), an SS / PBCH Block Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), a Layer 1 Reference Signal Received Power (L1-RSRP), a Reference Signal Received Quality (L1-RSRQ), a Signal-to-Noise and Interference Ratio (L1-SINR) or a Signal-to-Interference and Noise Ratio (L1-SNR), and the like.

[0046] The UE can also receive information (report configuration information) related to the CSI report, and control the CSI report based on the report configuration information. The report configuration information can also be, for example, “CSI-ReportConfig” of an Information Element (IE) of Radio Resource Control (RRC). In addition, in the present disclosure, the RRC IE can also be referred to as an RRC parameter, a higher layer parameter, and the like.

[0047] The report configuration information (for example, “CSI-ReportConfig” of the RRC IE) can also contain, for example, at least one of the following.

[0048] • Information related to the type of the CSI report (report type information, for example, “reportConfigType” of the RRC IE)

[0049] • Information related to one or more quantities (one or more CSI parameters) of CSI that should be reported (report quantity information, for example, “reportQuantity” of the RRC IE)

[0050] • Information related to the resource used by the RS utilized in the generation of the amount (the CSI parameter) (resource information, such as "CSI-ResourceConfigld" of the RRC IE)

[0051] • Information related to the frequency domain that is the object of the CSI report (frequency domain information, such as "reportFreqConfiguration" of the RRC IE)

[0052] For example, the report type information can also indicate a periodic CSI (P-CSI) report, an aperiodic CSI (A-CSI) report, or a semi-persistent CSI (SP-CSI) report.

[0053] Further, the report amount information can also specify a combination of at least one of the above-described CSI parameters (for example, CRI, RI, PMI, CQI, LI, L-RSRP, and the like).

[0054] Further, the resource information can also be an ID of the RS resource. The RS resource can also include, for example, a non-zero-power CSI-RS resource or an SSB, and a CSI-IM resource (for example, a zero-power CSI-RS resource).

[0055] The UE performs channel estimation using the received RS, estimates a channel matrix H. The UE feeds back an index (PMI) decided based on the estimated channel matrix.

[0056] The PMI can also indicate a precoder matrix (also simply referred to as a precoder) that the UE considers to be suitable for precoding a downlink (DL) transmission to the UE. Each value of the PMI can also correspond to one precoder matrix. A set of values of the PMI can also correspond to a set of different precoder matrices referred to as a precoder codebook (may also be simply referred to as a codebook).

[0057] In the space domain, the CSI report can also contain more than one type of CSI. For example, the CSI can also contain at least one of a first type (Type 1 CSI) used for selection of a single beam and a second type (Type 2 CSI) used for selection of multiple beams. The single beam can also be referred to as a single layer, and the multiple beams can also be referred to as multiple layers. In addition, it can also be that the Type 1 CSI does not assume multi-user multiple-input multiple-output (MIMO), and the Type 2 CSI assumes multi-user MIMO.

[0058] The codebook described above can also contain a codebook for Type 1 CSI (also referred to as a Type 1 codebook, etc.) and a codebook for Type 2 CSI (also referred to as a Type 2 codebook, etc.). In addition, the Type 1 CSI can also contain Type 1 single-plane CSI and Type 1 multi-plane CSI, and different codebooks (Type 1 single-plane codebook, Type 1 multi-plane codebook) can be respectively defined.

[0059] In the present disclosure, Type 1 and Type I can be replaced with each other. In the present disclosure, Type 2 and Type II can be replaced with each other.

[0060] The uplink control information (UCI) type can also contain at least one of a hybrid automatic repeat request acknowledgement (HARQ-ACK), a scheduling request (SR), and CSI. The UCI can be transmitted by PUCCH or PUSCH.

[0061] The UE can also report a list of supported CSI-RS resources for each CSI codebook type. For example, the UE reports information related to the maximum number of transmission ports per resource, the maximum number of resources per band, and the total number of transmission ports per band (for example, {maxNumberTxPortsPerResource, maxNumberResourcesPerBand, totalNumberTxPorstPerBand}).

[0062] The maximum number of transmission ports per resource (maxNumberTxPortsPerResource) indicates the maximum number of transmission ports in a resource (e.g., the maximum number of transmission ports that can be set at the same time in a CSI-RS resource). The maximum number of resources per band (maxNumberResourcesPerBand) indicates the maximum number of resources in all CCs (or cells) in a band (e.g., the maximum number of CSI-RS resources that can be set at the same time through all CCs). The total number of transmission ports per band (totalNumberTxPortsPerBand) indicates the total number of transmission ports in all CCs in a band (e.g., the total number of transmission ports that can be set at the same time through all CCs). In addition, the CC corresponds to a CC included in the band.

[0063] The UE can also report codebook parameters (e.g., codebookParameters) related to the codebook as the band parameters (e.g., BandNR parameters) per band. The codebook parameters can also indicate parameters corresponding to the codebook supported by the UE. At least one of the following (1) to (4) parameters can also be included in the codebook parameters. For example, (1) is mandatory, and (2) to (4) can also be optional.

[0064] (1) Parameters of a type 1 single panel codebook (type1 siglePanel) supported by the UE

[0065] (2) Parameters of a type 1 multi-panel codebook (type1 multiPanel) supported by the UE

[0066] (3) Parameters of a type 2 codebook (type2) supported by the UE

[0067] (4) Parameters of a type 2 codebook with port selection supported by the UE (type2-PortSelection)

[0068] Each of the parameters of (1) to (4) can also include information (supportedCSI-RS-ResourceList) related to a list of CSI-RS resources supported by the UE. In addition, the information related to the list of CSI-RS resources can also include a list of the following parameters described above.

[0069] • Maximum number of transmission ports per resource (maxNumberTxPortsPerResource)

[0070] • Maximum number of resources per band (maxNumberResourcesPerBand)

[0071] • Total number of transmission ports per band (totalNumberTxPortsPerBand)

[0072] The above parameters (1) to (4) related to codebook reported by the UE can also be referred to as FG2-36 / 2-40 / 2-41 / 2-43. The parameters {maxNumberTxPortsPerResource, maxNumberResourcesPerBand, totalNumberTxPortsPerBand} included in the list of CSI-RS resources can also be referred to as triplets.

[0073] In addition, the UE supporting the combination of multiple frequency bands can also report specific parameters (e.g., UE capability information) for each combination of frequency bands. The combination of frequency bands can also be referred to as Band Combination (BC).

[0074] The specific parameters (e.g., CA-ParametersNR, or csi-RS-IM-ReceptionForFeedbackPerBandComb) can also include a parameter equivalent to the maximum number of CSI-RS resources in all CCs / activated BWPs (e.g., maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC), and a parameter equivalent to the total number of ports of CSI-RS resources in all CCs / activated BWPs (e.g., totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC).

[0075] 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 simultaneously set through all CCs in the activated BWPs. This parameter limits the total number of CSI-RS resources that the NW can set through all CCs. The NW can apply this limit in addition to the limit notified by the maximum number of CSI-RS resources per CC (e.g., maxNumberSimultaneousNZP-CSI-RS-PerCC).

[0076] A parameter (e.g., totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC) equivalent to the total number of ports of CSI-RS resources in all CCs / activated BWP indicates the total number of ports of CSI-RS resources simultaneously set through all CCs in the activated BWP. This parameter limits the total number of ports that the NW can set through all CCs. The NW can apply this limit in addition to the limit notified through the total number of ports of CSI-RS resources per CC (totalNumberPortsSimultaneousNZP-CSI-RS-PerCC).

[0077] A specific parameter (or specific parameters reported per BC) related to Band Combination (BC) reported by the UE can also be referred to as FG2-33.

[0078] The UE reports a specific parameter (e.g., CA-ParametersNR) per BC (refer to Figure 1 ), and can also report a parameter (e.g., CodebookParameters) related to a codebook per band (refer to Figure 2 ) / triplet.

[0079] In the CSI processing criteria, the UE can also not be assumed to have the number of activated CSI-RS ports or the number of activated CSI-RS resources above the number reported as capability information in any slot. In the case of aperiodic CSI-RS, the CSI-RS (e.g., NZP CSI-RS) resource becomes activated during the period from the reception (e.g., the last symbol) of the PDCCH containing the CSI request to the transmission (e.g., the last symbol) of the PUSCH in which the CSI report is made (refer to Figure 3 ). In the case of periodic CSI-RS, the CSI-RS (e.g., NZP CSI-RS) resource becomes activated during the period from when the periodic CSI-RS is set through higher layer signaling to when the CSI-RS is released.

[0080] The UE reports a first parameter (e.g., FG2-36 / 2-40 / 2-41 / 2-43) / triplet related to more than one codebook per band. For example, assume the case where the UE reports the following list as the first parameter / triplet ({maxNumberTxPortsPerResource, maxNumberResourcesPerBand, totalNumberTxPortsPerBand}) for band A and band B.

[0081] Band A: {16, 1, 16}, {8, 2, 12}

[0082] Band B: {16, 1, 16}, {8, 2, 12}

[0083] In this case, when the UE utilizes the combination of Band A and Band B, it is required to support {16, 2, 32} and {8, 4, 24}.

[0084] However, a case where only common hardware with a certain budget is used for CSI computation of all bands in one UE is also considered. In this case, it is also considered that the UE can support a lower capability than the above (e.g., {16, 1, 16}, {8, 2, 12}) when the bands are combined.

[0085] Generally, since the parameters related to the codebook are reported for each band, the CSI processing capability is not shared among the bands supported by the UE. Therefore, if the UE reports the parameters related to the codebook (e.g., maxNumberResourcesPerBand and totalNumberTxPortsPerBand) for each band without considering the combination of the bands, it is possible that the CSI-RS resources / ports above the capability of the UE are set when the bands are combined.

[0086] As a method of avoiding such a case, it is considered to report a value lower than the actual UE capability (conservative reporting) as the value reported by the UE for each band. That is, it is assumed that the UE conservatively decides (conservative evaluation) the value of the first parameter / triplet related to the codebook reported for each band when the combination of the plurality of bands is considered.

[0087] For example, it is considered that the UE conservatively reports the first parameter (e.g., FG2-36 / 2-40 / 2-41 / 2-43) / triplet related to the codebook as follows with respect to Band A and Band B.

[0088] Band A: {4, 1, 4}

[0089] Band B: {4, 1, 4}

[0090] In the case where the UE performs conservative reporting, even when one band is utilized (single band mode is applied), the number of CSI-RS resources / ports scheduled from the network is reduced. Thus, in the case where the UE applies the single band mode, since the CSI-RS resources / ports are set less than the UE capability, there is a concern that the communication quality is degraded.

[0091] Therefore, it is contemplated that the UE reports specific parameters related to CSI processing capability considering the band combination. For example, as described above, for each band combination (BC), the UE reports a parameter equivalent to the maximum number of CSI-RS resources in all CCs / activated BWPs (e.g., maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC) and a parameter equivalent to the total number of ports of CSI-RS resources in all CCs / activated BWPs (e.g., totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC).

[0092] For example, the case where the first parameter related to the codebook (e.g., FG2-36 / 2-40 / 2-41 / 2-43) / triplet is reported and the specific parameter related to the BS (e.g., FG2-33) is discussed for band A and band B is discussed.

[0093] Band A: {16, 1, 16}, {8, 2, 12}

[0094] Band B: {16, 1, 16}, {8, 2, 12}

[0095] <Case 1>

[0096] It is assumed that the UE reports {2, 16} as the specific parameter related to the band combination (e.g., band A+B) (second parameter) {maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC, totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC}.

[0097] In this case, the NW can set 1 CSI-RS resource (or, 1 8-port CSI-RS resource) corresponding to 8 ports for band A and 1 CSI-RS resource (or, 1 8-port CSI-RS resource) corresponding to 8 ports for band B. However, it is not possible to set 2 CSI-RS resources (or, 2 CSI reports having 8-port CSI-RS resources) corresponding to 8 ports for each band, respectively.

[0098] This is because the maximum number of CSI-RS resources in the BC is limited to 2. In addition, in the case where 2 CSI-RS resources are set for only one band, since the total number of ports is limited to 12, it is not possible to set 2 8-port CSI-RSs for 1 band.

[0099] In addition, in a case where the report for each frequency band is interpreted as per frequency band, 8 ports (frequency band A) + 8 ports (frequency band B) can be set. However, in this case, the UE needs to process 16 port CSI-RS in 2 frequency bands. In a UE that shares a CSI processing unit between frequency bands, since the same CSI processing capability is assumed in both within a frequency band and between frequency bands, in a case where {x, 2, 12} is reported per frequency band, the CSI-RS for a total of 2 ports can also be processed for 12 ports in multiple frequency bands. Therefore, in order to avoid the above, the UE conservatively reports {x, 2, 6} per frequency band, while being set 16 port CSI-RS in 2 frequency bands.

[0100] <Case 2>

[0101] A case where the UE reports {1, 16} is assumed as a specific parameter related to a frequency band combination (e.g., frequency band A + B).

[0102] In this case, the number of CSI-RS resources simultaneously set in frequency band A and frequency band B is limited to 1. Therefore, if periodic CSI-RS is set in one of the frequency bands, CSI reporting is not supported in the other frequency band. In order to support CSI reporting in both frequency bands, aperiodic CSI-RS that does not overlap in the time direction needs to be set in each of the two frequency bands. However, in this case, control also needs to be performed so that aperiodic CSI-RS is not activated at the same time in 2 frequency bands.

[0103] <Case 3>

[0104] A case where the UE reports {2, 12} is assumed as a specific parameter related to a frequency band combination (e.g., frequency band A + B).

[0105] In this case, 1 CSI-RS resource can be set in each frequency band, 4 ports are set in one frequency band, and 8 ports are set in the other frequency band (setting 1, 2 of Figure 4 In addition, by staggering (TDM) aperiodic CSI-RS in the time direction between frequency band A and frequency band B, 1 CSI-RS resource corresponding to 12 ports can be set in each frequency band (setting 3 of Figure 4

[0106] In Case 3, the total number of port quantities in BC is limited to 12. Therefore, in one frequency band (frequency band A / B), even in a case where only a single frequency band is activated, 1 CSI-RS resource and 16 ports (16 port CSI-RS resource) are not supported in frequency band CA.

[0107] ​Thus, in the existing reporting method, a structure in which a specific parameter related to a band combination (for example, a specific parameter reported commonly for different CSI types) is reported becomes a structure. However, in this reporting method, there is a concern that the number of CSI-RS resources / port numbers set in each band cannot be appropriately set.

[0108] Therefore, the inventors of the present application have researched a reporting method / interpretation of a parameter related to a BC, and have conceived the present embodiment.

[0109] Hereinafter, the embodiments related to the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication method and each mode related to each embodiment can be applied individually, or can be applied in combination. In addition, in the present disclosure, "A / B" can be referred to as "at least one of A and B".

[0110] In the following description, the port, the CSI-RS port, and the CSI-RS resource can be replaced with each other. In addition, each band combination (BC) can be used as each CSI codebook type in addition to each BC.

[0111] (First Mode)

[0112] In the first mode, a case in which a plurality of parameters (or, a combination of parameters) is reported as a specific parameter related to a band combination (for example, FG2-33) is described.

[0113] In the following description, a case in which the maximum number of CSI-RS resources in all CCs / activated BWPs (for example, maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC) and the total number of ports of CSI-RS resources in all CCs / activated BWPs (for example, totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC) are reported as a specific parameter related to a band combination (BC) is described, but is not limited thereto. In addition, the maximum number of transmission ports of each resource can also be reported.

[0114] A structure in which reporting / listing of a plurality of combinations is supported (or, allowed) as a specific parameter related to a BC (for example, FG2-33) is provided. The number of specific parameters reported by the UE can also be determined based on a specific condition (for example, the number of CSI codebook types (or, the type of CSI)). The CSI-RS resource / CSI-RS port can also be reported / set for each BC and each CSI codebook type.

[0115] The UE controls the transmission of the UE capability information reported for each BC using at least one of the following reporting methods 1-1 to reporting method 1-3.

[0116] <Reporting method 1-1>

[0117] For example, the UE can report one or more combinations of {maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC, totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC} for each BC and each CSI codebook type (see FG2-36 / 2-40 / 2-41 / 2-43). Figure 5A , B). Figure 5A Reporting method 1-2 indicates a reporting method of the existing system reporting one specific parameter, Figure 5B Reporting method 1-3 indicates a reporting method reporting multiple specific parameters (also referred to as updating FG2-33 or expanding FG2-33).

[0118] Figure 5B In FG2-36 / 2-40 / 2-41 / 2-43, the UE reports codebook-related parameters (for example, FG2-36 / 2-40 / 2-41 / 2-43) for band A and band B as follows.

[0119] Band A: {16, 1, 16}, {8, 2, 12}

[0120] Band B: {16, 1, 16}, {8, 2, 12}

[0121] Further, a case where specific parameters (for example, updating FG2-33) related to BCs are reported as a list of 2 is shown as follows. Of course, the combination of the reported is not limited to 2, and can be 3 or more.

[0122] Band A+B: {1, 16}, {2, 12}

[0123] The UE can also report one or more combinations of {maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC, totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC} for each BC and each CSI codebook type (see FG2-36 / 2-40 / 2-41 / 2-43). In Figure 6A Figure 6A ​In the middle, the case where, for each BC (and each CSI codebook type), a parameter related to the maximum number of CSI-RS resources (e.g., maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC) and a parameter related to the total number of ports (e.g., totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC) are reported respectively is shown. Each list can also be specified to be selected from a certain number (refer to Figure 6B )

[0124] <Reporting method 1-2>

[0125] Alternatively, it can also be configured as follows: for each BC and each CSI codebook type, a parameter (e.g., csi-RS-IM-ReceptionForFeedbackPerBandComb) containing a certain parameter (e.g., updated FG2-33) is reported (refer to Figure 7A ).

[0126] <Reporting method 1-3>

[0127] Alternatively, it can also be configured as follows: for each BC and each CSI codebook type, a list of parameters (e.g., CA-ParametersNR-v1540) containing a parameter (e.g., csi-RS-IM-ReceptionForFeedbackPerBandComb) containing a certain parameter (e.g., updated FG2-33) is reported (refer to Figure 7B ).

[0128] <Reporting content>

[0129] The combination of the certain parameters (e.g., FG2-33) related to the BC can also be limited. That is, it can also be configured as a structure where only a limited combination is reported as the certain parameters (e.g., updated FG2-33) related to the BC.

[0130] The limitation of the certain parameters can also be determined based on the parameters related to the codebook (e.g., FG2-36 / 2-40 / 2-41 / 2-43) / triplet. For example, when the maximum value of the CSI-RS resources is 1, 2 in band A and 1, 2 in band B, the UE can also assume that the maximum value of the possible CSI-RS resources in the entire band A+B supports at least one or all of the following maximum values #1-#5.

[0131] Maximum value #1: maximum value of one of band A or band B

[0132] Maximum #2: maximum of the other one of Band A or Band B

[0133] Maximum #3: sum of Band A and Band B (1+1)

[0134] Maximum #4: sum of Band A and Band B (2+1 or 1+2)

[0135] Maximum #5: sum of Band A and Band B (2+2)

[0136] As the maximum of the CSI-RS resources possible in the Band A+B as a whole, the UE can also support the configuration of 1, 2, 3, 4. For example, as the specific parameters related to BC, the UE can also report at least one or all of {1, 16}, {2, 12}, {3, 4}, and {4, 4} (refer to Figure 8 ). In this case, the maximum of 3, 4 of the CSI-RS resources can also be limited to the case where the band combination is applied (and, the maximum CSI-RS resource of 1 CC is limited to 2).

[0137] In addition, as to the number of ports as well as the number of CSI-RS, it can also be decided based on the parameters related to the codebook (for example, FG2-36 / 2-40 / 2-41 / 2-43) / triplet.

[0138] In this way, as the specific parameters related to BC, a plurality of parameters / lists are reported. Thereby, for BC, a plurality of CSI-RS resources / ports can be reported, and thus even if the parameters related to the codebook (for example, FG2-36 / 2-40 / 2-41 / 2-43) / triplet are not conservatively reported, the number of CSI-RS resources / ports can be appropriately set.

[0139] Further, even in the case where 1 CSI-RS resource number is reported as the specific parameters related to BC, by additionally reporting a plurality of CSI-RS resource numbers, the CSI-RS resources can be set for a plurality of bands when BC is applied.

[0140] As the specific parameters related to BC, the UE can also explicitly notify at least one of information related to the maximum number of resources (for example, maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC), and information related to the total number of ports corresponding to the CSI-RS (for example, totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC).

[0141] <Report the total number of ports>

[0142] The UE can also be controlled to explicitly report a list of the total number of ports corresponding to the CSI-RS, and not explicitly report information on the maximum number of CSI-RS resources (refer to Figure 9 ). In this case, the index of the list can also correspond to the number of CSI-RS resources (e.g., 1 to 64).

[0143] For example, the initial value of the list can also correspond to the total number of CSI-RS ports for 1 CSI-RS resource. That is, the total number of ports to be reported {16, 8, 4, 2,...} can also correspond to the maximum number of CSI-RS resources {1, 2, 3, 4,...}, respectively. The ports can also be selected from 2 to 256.

[0144] In Figure 9 , 16 CSI-RS ports correspond to 1 CSI-RS resource, and 8 CSI-RS ports correspond to 2 CSI-RS resources. Thus, by setting the structure to not explicitly report the maximum number of CSI-RS resources, the increase in the overhead of the UE at the time of reporting can be suppressed.

[0145] Further, the total number of ports of a specific number can also be reported (refer to Figure 10 ). For example, the UE reports the total number of ports for the maximum number of N1 (here, 7 (1, 2, 4, 8, 16, 32, 64) ) CSI-RS resources. The index of the list can also correspond to the maximum number of N1 CSI-RS resources (1, 2, 4, 8, 16, 32, 64).

[0146] For example, the initial value of the list can also correspond to the total number of CSI-RS ports for 1 CSI-RS resource. That is, the total number of ports to be reported {16, 8, 4, 2,...} can also correspond to the maximum number of CSI-RS resources {1, 2, 4, 8,...}, respectively. The CSI-RS ports can also be selected from 2 to 256.

[0147] N1 can be defined in advance in the specification, or can be set to the UE from the network through higher layer signaling, etc.

[0148] Alternatively, N1 and the maximum value of the CSI-RS resources corresponding to N1 to be reported can also be determined based on the codebook-related parameters (FG2-36 / 2-40 / 2-41 / 2-43) / triplets reported for each frequency band.

[0149] For example, the UE assumes a case where the maximum number of CSI-RS resources is 1, 2 in frequency band A, and 1, 2 in frequency band B (refer to Figure 11). In this case, the maximum number of CSI-RS resources possible in the entire band A+B can also be reported as the total number of ports corresponding to the number of CSI-RS resources supported in the following maximum numbers #1-#5 of {1, 2, 3, 4,...}. That is, it can also be judged that N1=4 (1, 2, 3, 4).

[0150] Maximum #1: Maximum of one of band A or band B

[0151] Maximum #2: Maximum of the other of band A or band B

[0152] Maximum #3: Sum of band A and band B (1+1)

[0153] Maximum #4: Sum of band A and band B (2+1 or 1+2)

[0154] Maximum #5: Sum of band A and band B (2+2)

[0155] In this case, the index of the list can also correspond to the maximum number of N1 CSI-RS resources (1, 2, 3, 4). The total number of reported ports {16, 8, 4, 4} can also correspond to the maximum number of CSI-RS resources {1, 2, 3, 4}, respectively.

[0156] <Report the maximum number of CSI-RS resources>

[0157] The UE can also be controlled to explicitly report a list of the maximum number of CSI-RS resources, and not to explicitly report information on the total number of ports corresponding to the CSI-RS (refer to Figure 12 ). In this case, the index of the list can also correspond to the number of ports corresponding to the CSI-RS resources (for example, 2 to 256).

[0158] For example, the initial value of the list can also indicate the maximum number of CSI-RS resources for 2 ports. That is, the reported maximum number of CSI-RS resources {16, 8, 4, 2,...} can also correspond to the total number of ports {2, 3, 4, 5,...}, respectively. The CSI-RS resources can also be selected from 1 to 64.

[0159] In Figure 12 , 16 CSI-RS resources correspond to 2 ports, and 8 CSI-RS resources correspond to 3 ports. In this way, by setting a structure in which the total number of ports corresponding to the CSI-RS resources is not explicitly reported, it is possible to suppress an increase in overhead in the case where the UE reports.

[0160] Furthermore, the maximum number of a specific number of CSI-RS resources can also be reported (refer toFigure 13 For example, the UE reports the maximum number of CSI-RS resources for a total of N2 (here, 8 (2, 4, 8, 16, 32, 64, 128, 256)) ports. The index of the list can also correspond to the total number of N2 ports (2, 4, 8, 16, 32, 64, 128, 256).

[0161] For example, the initial value of the list can also correspond to the maximum number of CSI-RS resources for 2 ports. That is, the reported maximum number of CSI-RS resources {16, 8, 4, 2,...} can also correspond to the total number of ports {2, 4, 8, 16,...}, respectively. The CSI-RS resources can also be selected from 1 to 64.

[0162] N2 can be defined in advance in the specification, or can be set to the UE from the network through higher layer signaling, etc.

[0163] The maximum number of CSI-RS resources per BC included in the specific parameter (e.g., FG2-33) related to the BC can also be set to be in the following values / ranges.

[0164] <Range #1>

[0165] It can be set to the same value as the maximum number of CSI-RS resources per band (or, included in the triple) (maxNrofCSI-RS-ResourcesperBC = maxNrofCSI-RS-Resources).

[0166] <Range #2>

[0167] It can be set to a value smaller than the maximum number of CSI-RS resources per band (or, included in the triple) (maxNrofCSI-RS-ResourcesperBC < maxNrofCSI-RS-Resources).

[0168] <Range #3>

[0169] It can be set to a value greater than the maximum number of CSI-RS resources per band (or, included in the triple) (maxNrofCSI-RS-ResourcesperBC > maxNrofCSI-RS-Resources).

[0170] The value / range of the maximum number of CSI-RS resources per BC can be defined in advance in the specification, or can be set to the UE from the network through higher layer signaling, etc.

[0171] <Setting / Explanation of Specific Parameters Related to BC>

[0172] In a case where a plurality of combinations are reported as specific parameters (for example, FG2-33) related to BC reported from the UE, control can also be performed so that the maximum value of CSI-RS resources respectively included in each combination is different.

[0173] For example, a case where {1, 16}, {2, 12}, and {3, 8} of 3 combinations are reported as specific parameters {maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC, totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC} from the UE is assumed (refer to Figure 14 ). Here, the maximum number of CSI-RS resources of the specific parameters included in each combination / list is 1, 2, 3, and is different from each other.

[0174] In this case, in a case where 1 activated CSI-RS resource is set in the BC within a slot, a total of 16 ports are supported within the BC. Further, in a case where 2 activated CSI-RS resources are set in the BC within a slot, a total of 12 ports are supported within the BC. Further, in a case where 3 activated CSI-RS resources are set in the BC within a slot, a total of 8 ports are supported within the BC.

[0175] The specific parameters (for example, FG2-33) related to BC are used for reporting for a plurality of frequency bands, and thus, a structure can also be provided in which reporting of 1 CSI-RS resource is not performed as the specific parameters reported for each BC (refer to Figure 15 ). That is, the specific parameters can also be limited to reporting related to the number of CSI-RS resources having a value greater than 1.

[0176] It can also be assumed that even in a case where there is no explicit indication / limitation based on high layer signaling or the like, the UE is not allowed to report a total of 1 CSI-RS resource for each BC.

[0177] Alternatively, it can also be assumed that even in a case where there is no explicit indication / limitation based on high layer signaling or the like, the UE is not allowed to report a total of 1 CSI-RS resource for each BC when reporting the maximum 1 CSI-RS resource quantity in any one of the frequency bands.

[0178] In a case where a total of 1 CSI-RS resource is set (e.g., in a case of a single band), the maximum number of CSI-RS ports can also be limited based on the parameters reported for each band (e.g., at least one of maxNumberTxPortsPerResource and totalNumberTxPortsPerBand).

[0179] (Second Method)

[0180] In the second method, UE operation in a case where a single band is applied or set is described.

[0181] In a case where the codebook-related parameters (e.g., FG2-36 / 2-40 / 2-41 / 2-43) / triplet reported for each band and the BC-specific parameters (e.g., F2-33) reported for each BC are reported, consider the following Cases 2-1 ~ 2-4.

[0182] <Case 2-1>

[0183] For each band report of the codebook-related parameters / triplet, multiple CSI-RS resources are allowed, and for each BC of the specific parameters, multiple CSI-RSs are allowed (refer to Figure 16A ). In Figure 16A , it is shown that the maximum number of CSI-RS resources for band A is 4, the maximum number of CSI-RS resources for band B is 2, and the maximum number of CSI-RS resources for a band combination (band A+B) is 2.

[0184] In this case, in a case where a single band is applied, if both the codebook-related parameters / triplet and the BC-specific parameters are considered, the maximum number of CSI-RS resources becomes as follows: band A = 2, band B = 2, and band A+B = 2.

[0185] <Case 2-2>

[0186] For each band report of the codebook-related parameters / triplet, multiple CSI-RS resources are allowed, and for each BC of the specific parameters, 1 CSI-RS is allowed (refer to Figure 16B ). In Figure 16B , it is shown that the maximum number of CSI-RS resources for band A is 4, the maximum number of CSI-RS resources for band B is 2, and the maximum number of CSI-RS resources for a band combination (band A+B) is 1.

[0187] In this case, if both the codebook-related parameter / triplet and the specific parameter related to the BC are considered when a single frequency band is applied, the maximum number of CSI-RS resources becomes as follows: frequency band A = 1, frequency band B = 1, frequency band A+B = 1.

[0188] <Case 2-3>

[0189] For each frequency band report of the codebook-related parameter / triplet, 1 CSI-RS resource is allowed, and for each BC of the specific parameter, multiple CSI-RSs are allowed (refer to Figure 16C ). In Figure 16C , it is shown that the maximum number of CSI-RS resources for frequency band A is 1, the maximum number of CSI-RS resources for frequency band B is 1, and the maximum number of CSI-RS resources for the frequency band combination (frequency band A+B) is 2.

[0190] In this case, if both the codebook-related parameter / triplet and the specific parameter related to the BC are considered when a single frequency band is applied, the maximum number of CSI-RS resources becomes as follows: frequency band A = 1, frequency band B = 1, frequency band A+B = 2.

[0191] <Case 2-4>

[0192] For each frequency band report of the codebook-related parameter / triplet, 1 CSI-RS resource is allowed, and for each BC of the specific parameter, multiple CSI-RSs are allowed (refer to Figure 16D ). In Figure 16D , it is shown that the maximum number of CSI-RS resources for frequency band A is 1, the maximum number of CSI-RS resources for frequency band B is 1, and the maximum number of CSI-RS resources for the frequency band combination (frequency band A+B) is 1.

[0193] In this case, if both the codebook-related parameter / triplet and the specific parameter related to the BC are considered when a single frequency band is applied, the maximum number of CSI-RS resources becomes as follows: frequency band A = 1, frequency band B = 1, frequency band A+B = 1.

[0194] In the above case (for example, Case 2-3), if both the codebook-related parameter / triplet and the specific parameter related to the BC are considered when a single frequency band is applied, the number of CSI-RS resources allowed when a single frequency band is applied cannot be set.

[0195] Therefore, it is also possible to have a structure in which, when a single frequency band is applied or set, the number of CSI-RS resources / port numbers is limited by the report of each frequency band of the codebook-related parameter / triplet and is not limited by the report of the specific parameter related to the BC.

[0196] For example, the UE can determine the number of CSI-RS resources / ports based on the value reported by the parameter / triplet related to the codebook, even in the case where a single frequency band is applied or set. That is, the UE, which operates as a UE in a single frequency band, can ignore the value reported with the specific parameter related to the BC and assume that the CSI-RS resource / ports corresponding to the value reported by the parameter / triplet related to the codebook are set (see Figure 17 ).

[0197] Figure 17 It is shown that {16, 1, 16}, {8, 2, 12} are respectively reported as the parameter / triplet related to the codebook corresponding to the frequency band A and the frequency band B (for example, FG2-36 / 2-40 / 2-41 / 2-43), and {2, 12} is reported as the specific parameter related to the BC corresponding to the frequency band combination (frequency band A+B).

[0198] In the case where a single frequency band A or a single frequency band B is applied / set, the network can set a maximum of 1 CSI-RS resource having a total of 16 ports, or a maximum of 2 CSI-RS resources having a total of 12 ports. In the case where a single frequency band is set, the UE can ignore the specific parameter related to the BC.

[0199] In the case where the frequency band combination (frequency band A+B) is applied / set, the network can set a maximum of 2 CSI-RS resources having a total of 12 ports (for example, 6 ports of the frequency band A + 6 ports of the frequency band B).

[0200] Thus, the CSI-RS resource / ports in a single frequency band (for example, a CSI-RS resource of 16 ports) can be appropriately set regardless of the value reported as the specific parameter related to the BC. Thus, appropriate CSI-RS resources / ports can be applied when a single frequency band is applied, and thus the communication quality can be improved.

[0201] In addition, the second method can be applied to the case where a plurality of specific parameters related to the BC are reported (for example, the first method).

[0202] Figure 18 It is shown that {16, 1, 16}, {8, 2, 12}, and {8, 4, 8} are respectively reported as the parameter / triplet related to the codebook corresponding to the frequency band A and the frequency band B (for example, FG2-36 / 2-40 / 2-41 / 2-43), and {2, 16}, {4, 8} are reported as the specific parameter related to the BC corresponding to the frequency band combination (frequency band A+B).

[0203] In a case where single band A or single band B is applied / set, the network can also set a maximum of 1 CSI-RS resource with a total of 16 ports, a maximum of 2 CSI-RS resources with a total of 12 ports, or a maximum of 4 CSI-RS resources with a total of 8 ports. In a case where single band is set, the UE can also ignore specific parameters related to BC.

[0204] In a case where band combination (band A+B) is applied / set, the network can also set a maximum of 2 CSI-RS resources with a total of 12 ports (for example, 6 ports of band A + 6 ports of band B). Alternatively, the network can also set a maximum of 4 CSI-RS resources with a total of 8 ports (for example, 4 ports of band A + 4 ports of band B).

[0205] In this way, in a case of single band, CSI-RS resources / ports are set based on parameters / triplets reported for each band without being limited to parameters related to BC (for example, FG2-33), and by setting such a structure, it is possible to eliminate the problems of the above-described case 1-2, case 1-3, case 2-3, and the like.

[0206] <Modification>

[0207] The UE can also report at least a list (for example, 2 lists) containing a maximum of 1 case of the number of CSI-RS resources as the first parameter (for example, FG2-36 / 2-40 / 2-41 / 2-43) reported for each band / triplet. In this case, the UE can also be controlled so as not to report multiple combinations (for example, report 1 parameter) with respect to the second parameter (for example, FG2-33) reported for each BC.

[0208] For example, assume a case where {1, 12} is reported as the second parameter related to BC for band A+B. In this case, the UE can also determine the value of the number of 1 CSI-RS resources (for example, the number of corresponding ports, and the like) based on the first parameter / triplet reported for each band. On the other hand, it can also be configured as a structure in which, in a case where the value of the number of 1 CSI-RS resources is reported as the first parameter / triplet reported for each band, a case where the number of CSI-RS resources is 1 ({1, x}) is not reported as the second parameter related to BC does not occur.

[0209] In addition, in a case where the UE reports 3 or more parameters (or, lists) as the first parameter reported for each band, the UE can also report multiple combinations as the second parameter related to BC.

[0210] For example, the UE envisages a case where, as the first parameter reported for each band, it reports, with respect to band A and band B, as follows.

[0211] Band A: {16, 1, 16}, {8, 2, 10}

[0212] Band B: {16, 1, 16}, {8, 2, 10}, {4, 3, 8}

[0213] In this case, when, as the second parameter reported for each BC, only one can be reported, only one of {3, 8} or {2, 10} can be reported. At this time, if only {3, 8} is reported, {2, 10} cannot be set, and if {2, 10} is reported, {3, 8} cannot be set. Therefore, it is also possible to provide a structure in which, when N (for example, 3) first parameters / lists are reported as single bands, N-1 (for example, 2) second parameters are reported.

[0214] Thus, in both single bands and multiple bands, it is possible to flexibly control the setting of CSI-RS resources / ports.

[0215] <Method of determining specific parameters related to BC>

[0216] It is also possible to determine, based on the parameters (for example, FG2-36 / 2-40 / 2-41 / 2-43) / triplets reported for each band, the parameters related to the maximum number of CSI-RS resources (for example, maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC) and the parameters related to the total number of ports (for example, totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC) reported for each BC.

[0217] In a case where a plurality of triplets are reported for a certain band, the maximum number of CSI-RS resources reported for each BC can also be set to be the same as the maximum value among the plurality of CSI-RS resource quantities included in the plurality of triplets.

[0218] For example, the UE envisages a case where, as the first parameter reported for each band, it reports, with respect to band A and band B, as follows.

[0219] Band A: {16, 1, 16}, {8, 2, 10}

[0220] Band B: {16, 1, 16}, {8, 2, 10}, {4, 3, 8}

[0221] In this case, the maximum number of CSI-RS resources reported per BC can also be set to 3. In addition, the total number of ports reported per BC can also be set to 8.

[0222] At this time, a case where the number of ports reported per BC is set to a value corresponding to the maximum number of the number of CSI-RS resources reported per band (3 in this case) is shown, but is not limited thereto. The maximum number of CSI-RS resources reported per band and the total number of ports reported per band can also be selected from different lists, respectively, rather than from one list.

[0223] (Third method)

[0224] In the third method, a method of applying a specific parameter (for example, update FG2-33) related to BC is explained.

[0225] The extension function of the specific parameter (for example, update FG2-33) related to BC shown in the first method can also be applied as a UE capability of Rel. 16.

[0226] Alternatively, the extension function can also be applied as a UE capability of Rel. 15. At this time, in order to secure backward compatibility with terminals not having the extension function (or, to avoid a change without downward compatibility), the following structure can also be provided.

[0227] A new UE can signal the capability of each legacy band with conservative numbers, the capability of a new band with braver numbers, and the capability of each new BC for inter-band CA. At this time, an old base station can read the capability of each legacy band with conservative numbers. A new base station can ignore the capability of each legacy band, and read the capability of each new band with braver numbers, and the capability of each new BC for inter-band CA.

[0228] An old UE can signal only the capability of each legacy band with conservative numbers. At this time, an old base station can read the capability of each legacy band with conservative numbers. A new base station can read the capability of each legacy band with conservative numbers.

[0229] In order to secure downward compatibility, all UEs directly report legacy signaling, but a new UE can further report capability signaling of each new band and capability signaling of each BC for parameters related to a codebook (for example, FG2-36 / 2-40 / 2-41 / 2-43).

[0230] (Fourth Mode)

[0231] In the fourth mode, an explanation method of the specific parameters related to BC which the UE reports (for example, update FG2-33) is explained.

[0232] The following case is assumed: that is, the UE reports as the first parameters / triplets related to the codebook, for the band A and the band B as follows, and as the specific parameters related to BC, for the band A+B as follows (refer to Figure 19 ).

[0233] Band A: {16, 1, 16}, {8, 2, 12}

[0234] Band B: {16, 1, 16}, {8, 2, 12}

[0235] Band A+B: {2, 16}

[0236] In this case, the network can set 1 CSI-RS for the band A and 1 CSI-RS for the band B. In this case, the number of CSI-RS ports corresponding to each CSI-RS resource can also be explained as either of the following Explanation 1 or Explanation 2.

[0237] <Explanation 1>

[0238] The UE can also explain that a total of 12 ports are supported in the band A+B as a whole. This is because the reported value of the band A or the band B is {8, 2, 12}, the reported value of the band A+B is {2, 16}, and according to the limitation of the lower value (here, the value of the number of ports is lower, “2, 12”), a total of 12 ports are assumed for the band A+B.

[0239] <Explanation 2>

[0240] The UE can also explain that a total of 16 ports are supported in the band A+B as a whole. This is because the reported value of the band A or the band B is {16, 1, 16}, the reported value of the band A+B is {2, 16}, and according to the limitation of the lower value (here, the value of the number of resources is lower, “1, 16”), a total of 16 ports are assumed for the band A+B.

[0241] In the case where the Explanation 2 is applied, even in the case where the total number of ports included in the second parameters related to BC is set to be lower than the total number of ports included in the first parameters, one band in the BC can be supported by the total number of ports included in the first parameters.

[0242] (Fifth Mode)

[0243] In a fifth approach, a case where a plurality of parameters (or, a combination of parameters) are reported as parameters related to band combination (e.g., FG2-33), and information on the maximum number of ports per resource for BC is reported, is explained.

[0244] As a specific parameter related to BC, the UE can also report the maximum number of CSI-RS resources (e.g., maxNumberResourcesPerBC), and the total number of ports of CSI-RS resources (e.g., totalNumberTxPortsPerBC). In addition, the UE can also report the maximum number of ports per resource (e.g., maxNumberTxPortsPerResource, or maxNumberTxPortsPerResourceperBC) related to BC (or, per BC).

[0245] The maximum number of CSI-RS resources (maxNumberResourcesPerBC) can also be referred to as the maximum number of CSI-RS resources in all CCs / activated BWPs (e.g., maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC). The total number of ports of CSI-RS resources (e.g., totalNumberTxPortsPerBC) can also be referred to as the total number of ports of CSI-RS resources in all CCs / activated BWPs (e.g., totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC).

[0246] As a specific parameter related to BC (e.g., FG2-33), reporting / listing of more than one (or, multiple) combinations can also be supported (or, allowed). As the maximum number of ports per resource for BC, reporting / listing of more than one (or, multiple) can also be supported (or, allowed).

[0247] The UE can also control transmission of UE capability information reported per BC using at least one of the following reporting method 5-1 ~ reporting method 5-2.

[0248] <Reporting method 5-1>

[0249] For example, the UE can also report more than one combination of {maxNumberResourcesPerBC, totalNumberTxPortsPerBC}, and the maximum number of ports per resource (maxNumberTxPortsPerResource) per BC per codebook type (refer to FG2-33).Figure 20 ). Figure 20 The case where a plurality of specific parameters (also referred to as updated FG2-33 or extended FG2-33), and parameters related to the maximum number of port numbers per resource are reported separately or independently is shown.

[0250] Figure 20 In the middle, the case where the UE reports parameters related to the codebook (for example, FG2-36 / 2-40 / 2-41 / 2-43) / triplet for band A and band B as follows is shown.

[0251] Band A: {16, 1, 16}, {8, 2, 10}

[0252] Band B: {16, 1, 16}, {8, 2, 12}, {4, 3, 8}

[0253] At this time, the case where the UE reports 2 specific parameters (for example, updated FG2-33) / list related to BC (here, band A+B) as follows is shown. Of course, the combination of the reported is not limited to 2, and can be 3 or more.

[0254] Band A+B (first information): {maxNumberResourcesPerBC, totalNumberTxPortsPerBC} = {2, 10}, {3, 8}

[0255] Band A+B (second information): maxNumberTxPortsPerResource = 8

[0256] As for the first information (here, {2, 10}, {3, 8}) and the second information (here, 8), the UE can also report them separately. For example, the UE can also report the first information and the second information using different bits (for example, capability bits). The plurality of combinations (here, {2, 10}, {3, 8}) included in the first information can also be reported as different lists.

[0257] In this way, by reporting the first information and the second information separately, the amount of signaling can be reduced compared to the case where the triplet reported for each band is reported for each BC itself.

[0258] <Reporting method 5-2>

[0259] For example, the UE can also report 1 or more combinations of {maxNumberResourcesPerBC, totalNumberTxPortsPerBC} and the maximum number of ports per resource (maxNumberTxPortsPerResource) for each BC / each CSI codebook type (see Figure 21 ) per each resource. Figure 21 The case where multiple specific parameters are reported with the same list (also referred to as updated FG2-33 or extended FG2-33) and the parameter related to the maximum number of ports per resource is shown.

[0260] Figure 21 In the middle, the case where the UE reports the parameters related to the codebook (FG2-36 / 2-40 / 2-41 / 2-43) / triplet for Band A and Band B as follows is shown.

[0261] Band A: {16, 1, 16}, {8, 2, 10}

[0262] Band B: {16, 1, 16}, {8, 2, 12}, {4, 3, 8}

[0263] At this time, the case where the UE reports the specific parameters related to the BC (here, Band A+B) (for example, updated FG2-33) and the parameter related to the maximum number of ports per resource with one list is shown. Of course, the combination of the reported parameters is not limited thereto.

[0264] Band A+B (first information): {X, (Y1, Z1), (Y2, Z2)}

[0265] X: maxNumberTxPortsPerResource

[0266] Y: maxNumberResourcesPerBC (or, maxNumberSimultaneousNZP-CSI-RS-ActBWP-AllCC)

[0267] Z: totalNumberTxPortsPerBC (or, totalNumberPortsSimultaneousNZP-CSI-RS-ActBWP-AllCC)

[0268] In Figure 21In this case, the UE can also report {8, (2, 10), (3, 8)} as the capability information for BC (in this case, frequency band A+B). At this time, X corresponds to (Y1, Z1), and also corresponds to (Y2, Z2). That is, it is equivalent to the case where (X, Y1, Z1), (X, Y2, Z2) are reported.

[0269] In this way, the maximum number of ports per resource is commonly set for a plurality of combinations of the maximum number of CSI-RS resources (e.g., maxNumberResourcesPerBC) and the total number of ports of CSI-RS resources (e.g., totalNumberTxPortsPerBC). Thereby, even in a case where the maximum number of ports per resource is reported for each BC, it is possible to suppress an increase in the amount of signaling.

[0270] In addition, with respect to the maximum number of ports per resource, it is also supported or allowed for the UE to report a plurality of values (e.g., X1, X2). For example, the number of pieces of information reported with respect to the maximum number of ports per resource (or the number of reports) is not limited to 1. The number of reports of the maximum number of ports per resource reported can also be less than or equal to the number of reports with respect to a plurality of combinations of the maximum number of CSI-RS resources (e.g., maxNumberResourcesPerBC) and the total number of ports of CSI-RS resources (e.g., totalNumberTxPortsPerBC).

[0271] (Sixth Mode)

[0272] In the sixth mode, a case where, as the parameter with respect to the frequency band combination, the same parameter as the triplet (or a parameter equivalent to the triplet) is reported for each BC, and reporting is not performed (or, reporting is omitted) for a part of the reports is described.

[0273] The UE can also report, for each BC / each CSI codebook type, the maximum number of ports per resource (e.g., maxNumberTxPortsPerResource, or maxNumberTxPortsPerResourceperBC), the maximum number of CSI-RS resources (e.g., maxNumberResourcesPerBC), and the total number of ports of CSI-RS resources (e.g., totalNumberTxPortsPerBC).

[0274] For example, the UE can also report {maxNumberTxPortsPerResource, maxNumberResourcesPerBC, totalNumberTxPortsPerBC} = {X, Y, Z} per BC per CSI codebook type through more than one (or, multiple) lists. As an example, the UE can also report (X1, Y1, Z1), (X2, Y2, Z2), and (X3, Y3, Z3) as the parameters related to BC. Of course, the number of reports (or, the number of lists reported) is not limited thereto.

[0275] In addition, the UE can also not perform reporting of a part of the reports (or, parameters) among the multiple reports (or, parameters), or omit the reporting. The omitted reporting can be a specific parameter (e.g., maxNumberTxPortsPerResource), or other parameters.

[0276] As an example, among (X1, Y1, Z1), (X2, Y2, Z2), and (X3, Y3, Z3), the reporting of X2, X3 can also be omitted, and reported as (X1, Y1, Z1), (—, Y2, Z2), and (—, Y3, Z3). The value (or, parameter) not reported can also be interpreted based on a specific condition / specific rule.

[0277] The network (e.g., base station) can also assume a specific value for the value (or, parameter) not reported based on a specific condition / specific rule.

[0278] For example, the specific value can also be other values reported per BC. When the UE reports (X1, Y1, Z1), (—, Y2, Z2), and (—, Y3, Z3), the parameter omitted from the reporting (here, X2, X3) can also be interpreted as the same value as X1. When X is reported multiple times, the value of X omitted from the reporting is determined considering the relationship with other parameters Y / Z.

[0279] Alternatively, the specific value can also be determined based on the combination of (x, y, z) (e.g., triplets) reported per band. When the UE reports (X1, Y1, Z1), (—, Y2, Z2), and (—, Y3, Z3), the parameter omitted from the reporting (here, X2, X3) can also be determined considering the combination of (x1, y1, z1), (x2, y2, z2), and (x3, y3, z3)… reported per band. For example, the specific value can be determined considering the relationship between the value of y / z and the value of x reported per band.

[0280] Alternatively, the UE can also omit the reporting of the combination (or list) equivalent to a single frequency band. For example, the UE can also omit the reporting of the maximum number of CSI-RS resources per BC (e.g., maxNumberResourcesPerBC) of 1 (e.g., (X, 1, Z)). This is because (X, 1, Z) is equivalent to a single frequency band, and thus the necessity of reporting with BC is low.

[0281] In this way, by omitting the transmission of a part of the reporting (or, parameter), even in the case of reporting the maximum number of ports per resource, it is possible to suppress the increase in the size of the information (e.g., higher layer message) to be reported by the UE.

[0282] (Variation)

[0283] In the case of reporting the maximum number of transmission ports per resource (maxNumberTxPortsPerResource) per BC, the following Rule 1 or 2 can also be applied.

[0284] <Rule 1>

[0285] As for the maximum number of transmission ports in the CSI-RS resource of a certain frequency band, the value of maxNumberTxPortsPerResource reported per frequency band is an upper limit value, and it can also be further limited to be below the value reported per BC.

[0286] <Rule 2>

[0287] As for the maximum number of transmission ports in the CSI-RS resource of a certain BC, the inter-band sum of the values of maxNumberTxPortsPerResource reported per frequency band is an upper limit value, and it can also be further limited to be below the value reported per BC.

[0288] The maximum number of transmission ports per resource (maxNumberTxPortsPerResource) is equivalent to the maximum number of transmission ports in a certain CSI-RS, and thus, in the case of being reported per BC, there is a concern that it is not clear which frequency band's CSI-RS. Therefore, by applying the following Rule 1 or 2, it is possible to solve this problem.

[0289] <Reporting of UE capability>

[0290] The UE can also report to the network whether or not the capability of reporting at least a part of the elements included in the triple as each BC is supported as a part of the UE capability. A capability bit / parameter for reporting whether or not the capability is supported can also be specified. Alternatively, the network can judge whether or not the capability is supported based on the configuration, structure, value of the report per band / per BC reported from the UE.

[0291] (Wireless communication system)

[0292] Hereinafter, a configuration of a wireless communication system to which an embodiment of the present disclosure relates will be described. In the wireless communication system, any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof is used for communication.

[0293] Figure 22 is a diagram illustrating an example of a schematic configuration of a wireless communication system to which an embodiment relates. The wireless communication system 1 can also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0294] Further, the wireless communication system 1 can also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). The MR-DC can include E-UTRA-NR Dual Connectivity (EN-DC), NR-E-UTRA Dual Connectivity (NE-DC), and the like.

[0295] In EN-DC, a base station (eNB) of LTE (E-UTRA) is a master node (MN), and a base station (gNB) of NR is a secondary node (SN). In NE-DC, a base station (gNB) of NR is an MN, and a base station (eNB) of LTE (E-UTRA) is an SN.

[0296] The wireless communication system 1 can also support dual connectivity between a plurality of base stations within the same RAT (for example, dual connectivity in which both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC)).

[0297] The wireless communication system 1 can also have a base station 11 that forms a macro cell C1 with a wide coverage, and base stations 12 (12a-12c) that are arranged within the macro cell C1 and form small cells C2 that are narrower than the macro cell C1. The user terminal 20 can also be located within at least one of the cells. The arrangement, number, and the like of the cells and the user terminal 20 are not limited to the illustrated manner. Hereinafter, the base stations 11 and 12 are collectively referred to as base stations 10 without distinction.

[0298] The user terminal 20 can also be connected to at least one of a plurality of base stations 10. The user terminal 20 can also use at least one of carrier aggregation (CA) using a plurality of component carriers (CCs) and dual connectivity (DC).

[0299] Each CC can be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 can be included in the FR1, and the small cell C2 can be included in the FR2. For example, the FR1 can be a sub-6 GHz band, and the FR2 can be an above-24 GHz band. Note that the frequency bands, definitions, and the like of the FR1 and the FR2 are not limited thereto, and for example, the FR1 can correspond to a band higher than the FR2.

[0300] Furthermore, the user terminal 20 can also use at least one of time division duplex (TDD) and frequency division duplex (FDD) for communication in each CC.

[0301] The plurality of base stations 10 can be connected through wired (for example, optical fiber in compliance with Common Public Radio Interface (CPRI), X2 interface, or the like) or wireless (for example, NR communication) means. For example, in a case where NR communication is utilized as a backhaul between the base stations 11 and 12, the base station 11, which corresponds to a higher layer station, can be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12, which corresponds to a relay station (relay), can also be referred to as an IAB node.

[0302] The base station 10 can also be connected to the core network 30 via another base station 10 or directly to the core network 30. The core network 30 can also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), or the like.

[0303] The user terminal 20 can also be a terminal that supports at least one of LTE, LTE-A, 5G, or the like.

[0304] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) can also be utilized. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like can be utilized in at least one of Downlink (DL) and Uplink (UP).

[0305] The wireless access scheme can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access schemes (for example, other single carrier transmission schemes, other multicarrier transmission schemes) can also be utilized for the wireless access scheme of UL and DL.

[0306] In the wireless communication system 1, as the downlink channel, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared among the user terminals 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and the like can also be used.

[0307] Further, in the wireless communication system 1, as the uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), and the like shared among the user terminals 20 can also be used.

[0308] Through the PDSCH, user data, higher layer control information, a System Information Block (SIB), and the like are transmitted. Through the PUSCH, user data, higher layer control information, and the like can also be transmitted. Further, through the PBCH, a Master Information Block (MIB) can also be transmitted.

[0309] Through the PDCCH, lower layer control information can also be transmitted. The lower layer control information can include, for example, downlink control information (DCI: Downlink Control Information) including scheduling information of at least one of the PDSCH and the PUSCH.

[0310] In addition, the DCI that schedules the PDSCH can also be referred to as a DL assignment, a DL DCI, and the like, and the DCI that schedules the PUSCH can also be referred to as a UL grant, a UL DCI, and the like. In addition, the PDSCH can be replaced with DL data, and the PUSCH can be replaced with UL data.

[0311] In the detection of the PDCCH, a control resource set (CORESET) and a search space can also be utilized. The CORESET corresponds to a resource in which the DCI is searched for. The search space corresponds to a search area of the PDCCH candidate and a search method. One CORESET can also be associated with one or a plurality of search spaces. The UE can also monitor the CORESET associated with a certain search space based on a search space configuration.

[0312] One search space can also correspond to the PDCCH candidate equivalent to one or a plurality of aggregation levels. One or a plurality of search spaces can also be referred to as a search space set. In addition, the "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", and the like of the present disclosure can also be replaced with each other.

[0313] Through the PUCCH, uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (for example, also referred to as a hybrid automatic repeat request acknowledgement (HARQ-ACK), ACK / NACK, and the like), and a scheduling request (SR) can also be transmitted. Through the PRACH, a random access preamble for establishing a connection with a cell can also be transmitted.

[0314] In addition, in the present disclosure, the downlink, uplink, and the like can also be expressed without the "link" being attached. Furthermore, the beginning of various channels can also be expressed without the "physical" being attached.

[0315] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like can also be transmitted. In the wireless communication system 1, as the DL-RS, 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)), and the like can also be transmitted.

[0316] The synchronization signal can also be at least one of, for example, a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block containing the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) can also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), or the like. In addition, the SS, the SSB, and the like can also be referred to as a reference signal.

[0317] Furthermore, 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), and the like can also be transmitted. In addition, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific Reference Signal).

[0318] (Base station)

[0319] Figure 23is a diagram showing an example of a structure of a base station according to an embodiment. The base station 10 has a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. Note that the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 can each be included more than one.

[0320] In addition, in the present example, functional blocks of characteristic parts in the present embodiment are mainly shown, and it is also conceivable that the base station 10 has other functional blocks required for wireless communication. Part of the processing of each unit described below can also be omitted.

[0321] The control unit 110 implements control of the entire base station 10. The control unit 110 can be constituted by a controller, a control circuit, or the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0322] The control unit 110 can also control generation of signals, scheduling (for example, resource allocation, mapping), and the like. The control unit 110 can also control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 can also generate data, control information, a sequence, and the like to be transmitted as signals, and forward them to the transmission / reception unit 120. The control unit 110 can also perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of wireless resources, and the like.

[0323] The transmission / reception unit 120 can include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 can include a transmission processing unit 1211 and a reception processing unit 1212. The transmission / reception unit 120 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0324] The transmission / reception unit 120 can be constituted as an integrated transmission / reception unit, or can be constituted by a transmission unit and a reception unit. The transmission unit can be constituted by the transmission processing unit 1211 and the RF unit 122. The reception unit can be constituted by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0325] The transmission / reception antenna 130 can be constituted by an antenna such as an array antenna described based on common knowledge in the technical field to which the present disclosure pertains.

[0326] The transmission / reception unit 120 can also transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission / reception unit 120 can also receive the above-described uplink channel, uplink reference signal, and the like.

[0327] The transmission / reception unit 120 can also form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

[0328] The transmission / reception unit 120 (transmission processing unit 1211) can also perform processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (for example, RLC retransmission control), processing of a Medium Access Control (MAC) layer (for example, HARQ retransmission control), and the like, on data, control information, and the like acquired from the control unit 110, for example, and generate a bit string to be transmitted.

[0329] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing of channel coding (which can include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (as necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, and the like, on the bit string to be transmitted, and output a baseband signal.

[0330] The transmission / reception unit 120 (RF unit 122) can also perform modulation to a wireless band, filter processing, amplification, and the like, on the baseband signal, and transmit a signal of the wireless band via the transmission / reception antenna 130.

[0331] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform amplification, filter processing, demodulation to a baseband signal, and the like, on a signal of the wireless band received by the transmission / reception antenna 130.

[0332] The transmission / reception unit 120 (reception processing unit 1212) can also apply, to the acquired baseband signal, reception processing such as analog / digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as necessary), filter processing, demapping, demodulation, decoding (which can also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, and acquire user data and the like.

[0333] The transmission / reception unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, and the like, based on the received signal. The measurement unit 123 can also measure a reception power (for example, Reference Signal Received Power (RSRP)), a reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), a signal strength (for example, Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), and the like. The measurement results can also be output to the control unit 110.

[0334] The transport path interface 140 can also transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, and the like, and acquire, transport, and the like, user data (user plane data), control plane data, and the like, for the user terminal 20.

[0335] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure can also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transport path interface 140.

[0336] The transmission / reception unit 120 can also receive a plurality of first information relating to a combination of a channel state information used resource for a frequency band combination and a number of ports for the frequency band combination, and second information relating to a number of ports for each channel state information used resource for the frequency band combination.

[0337] The control unit 110 can also control transmission of the channel state information used reference signal based on the first information and the second information.

[0338] (User terminal)

[0339] Figure 24 is a diagram showing an example of a structure of a user terminal according to an embodiment. The user terminal 20 has 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 can each be included more than one.

[0340] In addition, in this example, functional blocks of characteristic parts in the present embodiment are mainly shown, and it can also be assumed that the user terminal 20 has other functional blocks necessary for wireless communication. A part of the processing of each unit described below can also be omitted.

[0341] The control unit 210 implements control of the entire user terminal 20. The control unit 210 can be constituted by a controller, a control circuit, or the like described based on common knowledge in the technical field to which the present disclosure relates.

[0342] The control unit 210 can also control generation, mapping, and the like of signals. The control unit 210 can also control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, and the like to be transmitted as signals, and forward them to the transmission / reception unit 220.

[0343] The transmission / reception unit 220 can include a baseband unit 221, an RF unit 222, a measurement unit 223. The baseband unit 221 can include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like described based on common knowledge in the technical field to which the present disclosure relates.

[0344] The transmission / reception unit 220 can be constituted by an integrated transmission / reception unit, or can be constituted by a transmission unit and a reception unit. The transmission unit can be constituted by the transmission processing unit 2211 and the RF unit 222. The reception unit can be constituted by the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0345] The transmission / reception antenna 230 can be constituted by an antenna such as an array antenna based on common knowledge in the technical field to which the present disclosure pertains.

[0346] The transmission / reception unit 220 can also receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission / reception unit 220 can also transmit the above-described uplink channel, uplink reference signal, and the like.

[0347] The transmission / reception unit 220 can also form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

[0348] The transmission / reception unit 220 (transmission 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), and the like on data, control information, and the like acquired from the control unit 210, for example, and generate a bit string to be transmitted.

[0349] The transmission / reception unit 220 (transmission processing unit 2211) can also perform transmission processing of channel coding (which can include error correction coding), modulation, mapping, filter processing, DFT processing (as necessary), IFFT processing, precoding, digital-to-analog conversion, and the like on the bit string to be transmitted, and output a baseband signal.

[0350] In addition, whether or not to apply DFT processing can also be based on the setting of transform precoding. The transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-described transmission processing in order to transmit a certain channel (for example, PUSCH) using a DFT-s-OFDM waveform in a case where transform precoding is enabled for the channel, and can not perform DFT processing as the above-described transmission processing in a case where this is not so.

[0351] The transmission / reception unit 220 (RF unit 222) can also perform modulation to a wireless band, filter processing, amplification, and the like on the baseband signal, and transmit a signal of the wireless band via the transmission / reception antenna 230.

[0352] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filter processing, demodulation to a baseband signal, and the like on a signal of the wireless band received by the transmission / reception antenna 230.

[0353] The transmission / reception unit 220 (the reception processing unit 2212) can also perform reception processing such as analog / digital conversion, FFT processing, IDFT processing (as necessary), filter processing, demapping, demodulation, decoding (which can include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, and the like on the acquired baseband signal, and acquire user data and the like.

[0354] The transmission / reception unit 220 (the measurement unit 223) can also perform measurement related to the received signal. For example, the measurement unit 223 can also perform RRM measurement, CSI measurement, and the like based on the received signal. The measurement unit 223 can also measure reception power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result can also be output to the control unit 210.

[0355] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure can also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0356] The transmission / reception unit 220 can also transmit a plurality of first information related to a combination of a channel state information resource for a frequency band combination and a number of ports for the frequency band combination, and second information related to a number of ports for each channel state information resource for the frequency band combination.

[0357] The control unit 210 can also control reporting of a plurality of first information related to a combination of a channel state information resource for a frequency band combination and a number of ports for the frequency band combination, and second information related to a number of ports for each channel state information resource for the frequency band combination.

[0358] The control unit 210 can also control such that the first information and the second information are reported respectively. Alternatively, the control unit 210 can also control such that the first information and the second information are reported by being included in the same list.

[0359] The control unit 210 can also control reporting of a plurality of information related to a combination of a number of ports for each channel state information resource for a frequency band combination, a channel state information resource for a frequency band combination, and a number of ports for a frequency band combination. Further, the control unit 210 can also control such that a number of ports for each channel state information resource for a frequency band combination is not reported in at least one of the plurality of information.

[0360] (Hardware structure)

[0361] Further, the block diagrams in the above-described embodiments show blocks using functional units. These functional blocks (structural units) are realized by any combination of hardware and software, and the method of realizing each functional block is not particularly limited. That is, each functional block can be realized by one device physically or logically integrated, or two or more devices physically or logically separated can be directly or indirectly (for example, by wire, wireless, or the like) connected and realized by the plurality of devices. Each functional block can also be realized by combining software with the above-described one device or the above-described plurality of devices.

[0362] Here, functions include judging, deciding, determining, calculating, computing, processing, deriving, investigating, searching, confirming, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, supposing, expecting, considering, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited thereto. For example, a functional block (structural unit) that functions to transmit can also be referred to as a transmitting unit, a transmitter, or the like. Regardless of which, the method of realizing the same is not particularly limited as described above.

[0363] For example, the base station, the user terminal, and the like in one embodiment of the present disclosure can function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 25 is a diagram showing an example of a hardware structure of a base station and a user terminal according to one embodiment. The base station 10 and the user terminal 20 can be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0364] Further, in the present disclosure, the terms of device, circuit, equipment, section, unit, and the like can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or a plurality of each device illustrated, or can be configured not to include a part of the devices.

[0365] For example, the processor 1001 is illustrated as only 1, but there can be a plurality of processors. Further, processing can be executed by 1 processor, and processing can also be executed by 2 or more processors simultaneously, sequentially, or using other methods. In addition, the processor 1001 can also be realized by 1 or more chips.

[0366] Each function in the base station 10 and the user terminal 20 is realized, for example, by reading specific software (a program) into the processor 1001, the memory 1002, and the like, and performing computation by the processor 1001, and controlling communication via the communication device 1004, or controlling reading and writing of data in the memory 1002 and the storage 1003, at least one of them.

[0367] The processor 1001 controls the entire computer, for example, by causing an operating system to operate. The processor 1001 can be constituted by a central processing device (a Central Processing Unit (CPU)) including an interface with a peripheral device, a control device, a computation device, a register, and the like. For example, at least a part of the above-described control unit 110 (210), the transmission-reception unit 120 (220), and the like can also be realized by the processor 1001.

[0368] Further, the processor 1001 reads a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processing based on them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 110 (210) can be realized by a control program stored in the memory 1002 and operated in the processor 1001, and the same can also be applied to other functional blocks.

[0369] The memory 1002 is a computer-readable recording medium, and can be constituted by at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), other suitable storage medium, for example. The memory 1002 can also be referred to as a register, a cache, a main storage (a main storage device), and the like. The memory 1002 can hold an executable program (program code), a software module, and the like for implementing a wireless communication method related to an embodiment of the present disclosure.

[0370] The storage 1003 is a computer-readable recording medium, and can be constituted by at least one of, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disk - read only memory (CD-ROM) or the like), a digital versatile disk, a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, an intelligent disk, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, another appropriate storage medium. The storage 1003 can also be referred to as an auxiliary storage device.

[0371] The communication device 1004 is hardware (a transmission-reception device) for communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, or the like, for example, in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-described transmission-reception unit 120 (220), the transmission-reception antenna 120 (230), or the like can also be implemented by the communication device 1004. The transmission-reception unit 120 (220) can also be implemented to be physically or logically separated by a transmission unit 120a (220a) and a reception unit 120b (220b).

[0372] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that receives an input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, or the like) that performs an output to the outside. In addition, the input device 1005 and the output device 1006 can also be a structure that is integrated (e.g., a touch panel).

[0373] Furthermore, the processor 1001, the memory 1002, and the like are connected by a bus 1007 for performing information communication. The bus 1007 can be constituted by a single bus, or can be constituted by different buses between each device.

[0374] Furthermore, the base station 10 and the user terminal 20 can be configured with 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 like hardware, and a part or all of each functional block can be implemented using the hardware. For example, the processor 1001 can be implemented using at least one of these hardware.

[0375] (Modified example)

[0376] In addition, as for the terms explained in the present disclosure and the terms necessary for understanding the present disclosure, terms having the same or similar meanings can be substituted. For example, a channel, a symbol and a signal (or signaling) can be substituted for each other. Furthermore, a signal can be a message. A reference signal can be simply referred to as RS, and according to the applied standard, can be referred to as a pilot, a pilot signal and the like. Furthermore, a component carrier (CC) can be referred to as a cell, a frequency carrier, a carrier frequency and the like.

[0377] A radio frame can also be configured with one or a plurality of periods (frames) in the time domain. The one or a plurality of periods (frames) configuring the radio frame can also be referred to as a subframe. Further, a subframe can also be configured with one or a plurality of slots in the time domain. A subframe can be a fixed length (for example, 1 ms) independent of numerology.

[0378] Here, numerology can be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology can represent at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering processing performed by a transmitter-receiver in the frequency domain, a specific windowing processing performed by a transmitter-receiver in the time domain and the like.

[0379] A slot can also be constituted by 1 or a plurality of symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Further, a slot can also be a time unit based on a numerology.

[0380] A slot can also include a plurality of mini-slots. Each mini-slot can be constituted by 1 or a plurality of symbols in the time domain. Further, a mini-slot can also be referred to as a sub-slot. A mini-slot can also be constituted by a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted by a time unit larger than a mini-slot can also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted with a mini-slot can also be referred to as PDSCH (PUSCH) mapping type B.

[0381] A radio frame, a subframe, a slot, a mini-slot, and a symbol each represent a time unit for transmitting a signal. A radio frame, a subframe, a slot, a mini-slot, and a symbol can also be referred to by other names corresponding to each. In addition, a time unit in the present disclosure, such as a frame, a subframe, a slot, a mini-slot, a symbol, and the like, can be replaced with each other.

[0382] For example, 1 subframe can also be referred to as a TTI, a plurality of continuous subframes can also be referred to as a TTI, 1 slot or 1 mini-slot can also be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in the existing LTE, can be a period shorter than 1 ms (for example, 1-13 symbols), or can be a period longer than 1 ms. In addition, a unit representing a TTI can also be referred to as a slot, a mini-slot, or the like, instead of a subframe.

[0383] Here, a TTI, for example, refers to a minimum time unit of scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling in which a radio resource (a frequency bandwidth, a transmission power, and the like that can be used in each user terminal) is allocated to each user terminal in units of a TTI. In addition, the definition of a TTI is not limited thereto.

[0384] A TTI can be a transmission time unit of a data packet (a transport block), a code block, a codeword, and the like after channel coding, or can become a processing unit of scheduling, link adaptation, and the like. In addition, when a TTI is given, a time interval (for example, a number of symbols) to which a transport block, a code block, a codeword, and the like are actually mapped can be shorter than the TTI.

[0385] In addition, in a case where one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) can be a minimum time unit of scheduling. Further, the number of slots (the number of mini-slots) constituting the minimum time unit of scheduling can also be controlled.

[0386] A TTI having a length of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a long subframe, a slot, etc. A TTI shorter than the normal TTI can also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0387] In addition, the long TTI (e.g., normal TTI, subframe, etc.) can also be replaced with a TTI having a length longer than 1 ms, and the short TTI (e.g., shortened TTI, etc.) can also be replaced with a TTI having a length shorter than the length of the long TTI and a length of 1 ms or more.

[0388] A resource block (RB) is a unit of resource allocation in the time domain and the frequency domain, and can also include one or more contiguous subcarriers in the frequency domain. The number of subcarriers included in the RB can also be the same regardless of the numerology, and can be 12, for example. The number of subcarriers included in the RB can also be determined based on the numerology.

[0389] In addition, the RB can include one or more symbols in the time domain, and can be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. can also be composed of one or more resource blocks, respectively.

[0390] In addition, one or more RBs can also be referred to as a physical resource block (physical RB (PRB)), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0391] In addition, a resource block can also be composed of one or more resource elements (REs). For example, one RE can also be a wireless resource area of one subcarrier and one symbol.

[0392] A bandwidth part (BWP) (may also be referred to as a partial bandwidth, etc.) can also indicate a subset of contiguous common RBs (common resource blocks) for a certain numerology in a certain carrier. Here, the common RBs can also be determined by the indices of the RBs with reference to a common reference point of the carrier. The PRB can also be defined in a certain BWP, within which numbering is performed.

[0393] The BWP can also include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs can also be configured in a carrier for a UE.

[0394] At least one of the BWPs that can be configured can be activated, and the UE can not be assumed to transmit and receive a specific signal / channel outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure can also be replaced with "BWP".

[0395] In addition, the structures of the wireless frame, the subframe, the slot, the mini-slot, the symbol, etc. described above are merely examples. For example, the number of subframes included in the wireless frame, the number of slots per subframe or wireless frame, the number of mini-slots included in the slot, the number of symbols and RBs included in the slot or mini-slot, the number of subcarriers included in the RB, and the number of symbols, the symbol length, the Cyclic Prefix (CP) length, etc. within the TTI can be variously changed.

[0396] Further, the information, the parameters, etc. described in the present disclosure can be expressed using absolute values, can be expressed using relative values with respect to specific values, or can be expressed using corresponding other information. For example, the wireless resources can also be indicated by a specific index.

[0397] The names used for the parameters, etc. in the present disclosure are not names that are limited in any point. Further, the mathematical expressions, etc. using these parameters can also be different from the mathematical expressions explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and the information elements can be identified by all appropriate names, and thus the various names assigned to these various channels and information elements are not names that are limited in any point.

[0398] The information, the signal, etc. described in the present disclosure can be expressed using any one of various different technologies. For example, the data, the instruction, the command, the information, the signal, the bit, the symbol, and the chip, etc. that can be mentioned throughout the above description can be expressed by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0399] Further, information, a signal, and the like can be output in at least one of a high layer to a low layer and a low layer to a high layer. Information, a signal, and the like can also be input and output via a plurality of network nodes.

[0400] Information, a signal, and the like that are input and output can be saved in a specific region (for example, a memory) and can be managed using a management table. Information, a signal, and the like that are input and output can also be overwritten, updated, or appended. Information, a signal, and the like that are output can also be deleted. Information, a signal, and the like that are input can also be transmitted to other devices.

[0401] Notification of information is not limited to the manners / embodiments described in the present disclosure and can be performed using other methods. For example, notification of information in the present disclosure can be implemented through physical layer signaling (for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high layer signaling (for example, Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), and the like), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0402] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Further, RRC signaling can also be referred to as an RRC message, for example, can be an RRC Connection Setup message, an RRC Connection Reconfiguration message, and the like. Further, MAC signaling can also be notified using, for example, a MAC Control Element (CE).

[0403] Further, notification of specific information (for example, notification of "X is") is not limited to explicit notification and can be performed implicitly (for example, by not performing notification of the specific information or by notification of other information).

[0404] The determination can be made by a value represented by 1 bit (0 or 1), by a true or false value represented by true or false), or by comparison of numerical values (for example, comparison with a specific value).

[0405] Software, regardless of being referred to as software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, execution threads, procedures, functions, etc.

[0406] Furthermore, software, instructions, information, and the like can be transmitted and received via a transmission medium. For example, in the case where software is transmitted from a website, a server, or other remote source using at least one of wired technologies (coaxial cables, optical cables, twisted pair cables, and Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared rays, microwaves, etc.), at least one of these wired technologies and wireless technologies is included in the definition of the transmission medium.

[0407] The terms "system" and "network" used in the present disclosure can be used interchangeably. The "network" can also mean an apparatus (for example, a base station) included in the network.

[0408] In the present disclosure, the terms "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", and the like can also be used interchangeably.

[0409] In the present disclosure, the terms "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", and the like are used interchangeably. The base station also exists in a case where it is referred to as a macro cell, a small cell, a femto cell, a pico cell, and the like.

[0410] The base station can accommodate one or multiple (for example, three) cells. In a case where the base station accommodates multiple cells, the coverage area of the base station as a whole can be divided into multiple smaller areas, and each smaller area can also provide a communication service by a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or all of the coverage area of at least one of the base station and the base station subsystem that provides a communication service in the coverage.

[0411] In the present disclosure, the terms "mobile station (MS)", "user terminal", "User Equipment (UE)", "terminal", and the like can be used interchangeably.

[0412] The mobile station also exists in a case where it is referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

[0413] At least one of the base station and the mobile station can also be referred to as a transmission device, a reception device, a wireless communication device, or the like. In addition, at least one of the base station and the mobile station can be a device mounted on a mobile body, the mobile body itself, or the like. The mobile body can be a vehicle (for example, an automobile, an airplane, or the like), can be a mobile body that moves in an unmanned manner (for example, a drone, a self-driving automobile, or the like), or can be 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 at the time of communication operation. For example, at least one of the base station and the mobile station can also be a sensor or the like, an Internet of Things (IoT) device.

[0414] Furthermore, the base station in the present disclosure can also be replaced with a user terminal. For example, for a structure in which communication between the base station and the user terminal is replaced with communication between a plurality of user terminals (for example, also referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), or the like), each of the modes / embodiments of the present disclosure can also be applied. In this case, the user terminal 20 can be configured to have the functions of the base station 10 described above. Furthermore, the words "uplink", "downlink", and the like can also be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, the uplink channel, the downlink channel, and the like can also be replaced with a side channel.

[0415] Likewise, the user terminal in the present disclosure can also be replaced with a base station. In this case, the base station 10 can be configured to have the functions of the user terminal 20 described above.

[0416] In the present disclosure, in the case of operations performed by the base station, they are sometimes performed by an upper node thereof depending on the situation. In a network including one or a plurality of network nodes having a base station, various operations performed for communication with a terminal can obviously be performed by the base station, one or more network nodes other than the base station (for example, consider a Mobility Management Entity (MME), a Serving-Gateway (S-GW), or the like, but not limited thereto), or a combination thereof.

[0417] The modes / embodiments described in the present disclosure can be used alone, in combination, or switched in conjunction with execution. Furthermore, the processing procedures, timing, flowcharts, and the like of the modes / embodiments described in the present disclosure can be exchanged in order as long as they are not contradictory. For example, regarding the methods described in the present disclosure, the elements of various steps are prompted using the illustrated order, and are not limited to the specific order prompted.

[0418] The modes / embodiments described in the present disclosure can be applied to a Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER3G, 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 an integer, a decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), and systems using other appropriate wireless communication methods, next-generation systems expanded based on them, and the like. Furthermore, a plurality of systems can be combined (for example, LTE or LTE-A, in combination with 5G, and the like) and applied.

[0419] The expression "based on" as used in this disclosure, unless otherwise explicitly described, does not mean "only based on". In other words, the expression "based on" means both "only based on" and "at least based on".

[0420] The term "determining" as used in this disclosure, sometimes includes a wide variety of actions. For example, "determining" can be regarded as equivalent to "deciding", "calculating", "computing", "processing", "deriving", "investigating", "looking up" (e.g., in tables, databases, or other data structures), "ascertaining" and the like.

[0421] Further, "determining" can also be regarded as equivalent to "receiving" (e.g., receiving information), "transmitting" (e.g., transmitting information), "inputting", "outputting", "accessing" (e.g., accessing data in a memory) and the like.

[0422] Further, "determining" can also be regarded as equivalent to "resolving", "selecting", "choosing", "establishing", "comparing" and the like. That is, "determining" can be regarded as equivalent to "determining" certain operations.

[0423] Further, "determining" can also be replaced with "assuming", "expecting", "considering" and the like.

[0424] The term "connected", "coupled" or all their derivatives as used in this disclosure means all kinds of connection or coupling between two or more elements directly or indirectly, and can include a case where one or more intermediate elements exist between the two elements which are "connected" or "coupled" with each other. The coupling or connection between elements can be physical or logical, or a combination thereof. For example, "connected" can be replaced with "accessed".

[0425] In the present disclosure, in the case where 2 elements are connected, it can be considered that they are "connected" or "combined" with each other using one or more electric wires, cables, printed electric connections, and the like, and as several non-limiting and non-exhaustive examples, using electromagnetic energy having a wavelength in the wireless frequency domain, the microwave region, the light (both visible and invisible) region, and the like, are "connected" or "combined" with each other.

[0426] In the present disclosure, the term "A is different from B" can also mean "A and B are mutually different". In addition, this term can also mean "A and B are respectively different from C". With respect to the terms "separated", "combined", and the like, the same can also be interpreted as "different".

[0427] In the present disclosure, in the case where "include", "including", and variations thereof are used, these terms mean inclusive, as with the term "comprising". Further, the term "or" used in the present disclosure is not an exclusive logical or.

[0428] In the present disclosure, for example, in the case where an article such as a, an, and the in English is added due to translation, the present disclosure can also include the case where the noun connected after the article is plural.

[0429] The above describes the invention related to the present disclosure in detail, but for those skilled in the art, the invention related to the present disclosure is obviously not limited to the embodiments described in the present disclosure. The invention related to the present disclosure can be implemented as a modification and a change without departing from the spirit and scope of the invention determined based on the recitations of the claims. Therefore, the recitations of the present disclosure are for the purpose of illustration and do not impose any restrictive meaning on the invention related to the present disclosure.

[0430] This application is based on Japanese Patent Application No. 2020-074780 filed on April 20, 2020. The content of the application is incorporated herein in its entirety.

Claims

1. A terminal having: a plurality of combinations of a band and a resource, and a parameter including a maximum number of ports of each resource; and a control unit that controls to cause a report of information related to support of a capability of reporting the maximum number of ports of each resource per each band combination in a part of terminal capability, and a transmission unit that transmits the parameter including the combinations, and the parameter including the maximum number of ports of each resource. The control unit controls to report the following parameters per each band combination: a parameter including a combination of a maximum number of simultaneous channel state information reference signal resources in an active bandwidth part (BWP) of all component carriers (CCs) and a total number of CSI-RS ports of simultaneous channel state information reference signal resources in the active BWP of the all CCs; 2. A wireless communication method of a terminal having: a plurality of combinations of a band and a resource, and a parameter including a maximum number of ports of each resource; and a control unit that controls to cause a report of information related to support of a capability of reporting the maximum number of ports of each resource per each band combination in a part of terminal capability, and a step of transmitting the parameter including the combinations, and the parameter including the maximum number of ports of each resource.

3. A system including a terminal and a base station, the terminal having: a plurality of combinations of a band and a resource, and a parameter including a maximum number of ports of each resource; and a control unit that controls to cause a report of information related to support of a capability of reporting the maximum number of ports of each resource per each band combination in a part of terminal capability, and a transmission unit that transmits the parameter including the combinations, and the parameter including the maximum number of ports of each resource, the base station having: a reception unit that receives the parameter including the combinations, and the parameter including the maximum number of ports of each resource, and a control unit that controls to cause a report of information related to support of a capability of reporting the maximum number of ports of each resource per each band combination in a part of terminal capability. ​ ​ ​ ​ controlling to report the following parameters per each band combination: a number of maximum combinations of the number of simultaneous channel state information reference signal resources in the active bandwidth part, BWP, of all component carriers, CCs, and the total number of CSI-RS ports of simultaneous channel state information reference signal resources in the active BWP of the all CCs; ​ ​ ​ ​ ​ ​ ​ The control unit controls to report the following parameters per each band combination: a parameter including a combination of a maximum number of simultaneous channel state information reference signal resources in an active bandwidth part (BWP) of all component carriers (CCs) and a total number of CSI-RS ports of simultaneous channel state information reference signal resources in the active BWP of the all CCs; ​ ​ ​ ​ ​ ​ ​

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