TERMINAL, RADIO COMMUNICATION METHOD, AND BASE STATION

A terminal according to an aspect of the present disclosure includes: a control section that controls mapping order of channel state information (CSI) fields included in a CSI report including information related to measurement of a plurality of transmission/reception points (TRPs), based on at least one of a substance of a parameter and a corresponding transport block (TB) index or TRP index; and a transmitting section that transmits the CSI report.

TECHNICAL FIELD

BACKGROUND ART

Successor systems of LTE (for example, also referred to as “5th generation mobile communication system (5G),” “5G+ (plus),” “6th generation mobile communication system (6G),” “New Radio (NR),” “3GPP Rel. 15 (or later versions),” and so on) are also under study.

CITATION LIST

SUMMARY OF INVENTION

Technical Problem

In NR, a user terminal (User Equipment (UE)) measures, based on a resource of a reference signal such as a channel state information reference signal (CSI-RS), a channel state, and feeds back (reports) the channel state information (CSI) to a network (for example, a base station).

For NR, it is under study that one or a plurality of transmission/reception points (TRPs) (multiple TRPs (multi-TRP (M-TRP))) perform DL transmission to a UE by using one or a plurality of panels (multiple panels). It is also under study that the UE performs UL transmission to the one or the plurality of TRPs by using the one or the plurality of panels.

However, in the NR specifications thus far, studies have not sufficiently been made on control of CSI reporting when the multiple panels/TRPs are used. For example, a known CSI priority does not take an account of the TRPs. Thus, with a known CSI priority used, CSI reporting cannot be appropriately performed for multiple TRPs, and this may cause throughput reduction or communication quality degradation.

In view of this, the present disclosure has one object to provide a terminal, a radio communication method, and a base station that enable appropriate control of CSI reporting even when a plurality of TRPs or panels are used.

Solution to Problem

A terminal according to an aspect of the present disclosure includes: a control section that controls mapping order of channel state information (CSI) fields included in a CSI report including information related to measurement of a plurality of transmission/reception points (TRPs), based on at least one of a substance of a parameter and a corresponding transport block (TB) index or TRP index; and a transmitting section that transmits the CSI report.

Advantageous Effects of Invention

According to an aspect of the present disclosure, even when a plurality of TRPs or panels are used, CSI reporting can be appropriately controlled.

DESCRIPTION OF EMBODIMENTS

In Rel-15 NR, a terminal (also referred to as a user terminal, a User Equipment (UE), and the like) generates (also referred to as determines, calculates, estimates, measures, and the like) 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, and the like) the generated CSI to a network (for example, a base station). The CSI may be transmitted to the base station by using an uplink control channel (for example, a Physical Uplink Control Channel (PUCCH)) or an uplink shared channel (for example, Physical Uplink Shared Channel (PUSCH)), for example.

The RS used for the generation of the CSI may be at least one of a channel state information reference signal (CSI-RS), a synchronization signal/broadcast channel (Synchronization Signal/Physical Broadcast Channel (SS/PBCH)) block, a synchronization signal (SS), a demodulation reference signal (DMRS), and the like, for example.

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

Note that the CSI may include at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), an SS/PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), L1-RSRP (reference signal received power in Layer 1) (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), an L1-SINR (Signal to Interference plus Noise Ratio), an L1-SNR (Signal to Noise Ratio), and the like.

The UE may receive information (report configuration information) related to a CSI report and control the CSI report based on the report configuration information. The report configuration information may be an information element (IE) “CSI-ReportConfig” of radio resource control (RRC), for example. Note that, in the present disclosure, the RRC IE may be interchangeably interpreted as an RRC parameter, a higher layer parameter, and the like.

The report configuration information (for example, the RRC IE “CSI-ReportConfig”) may include at least one of the following, for example.Information (report type information, for example, an RRC IE “reportConfigType”) related to a type of the CSI reportInformation (report quantity information, for example, an RRC IE “reportQuantity”) related to one or more quantities (one or more CSI parameters) of the CSI to be reportedInformation (resource information, for example, an RRC IE “CSI-ResourceConfigId”) related to the resource for the RS used for generation of the quantity (the CSI parameter)Information (frequency domain information, for example, an RRC IE “reportFreqConfiguration”) related to the frequency domain being a target of the CSI report

For example, the report type information may indicate a periodic CSI (P-CSI) report, an aperiodic CSI (A-CSI) report, or a semi-persistent (semi-permanent) CSI report (SP-CSI) report.

The report quantity information may specify at least one combination of the CSI parameters described above (for example, CRI, RI, PMI, CQI, LI, L1-RSRP, and the like).

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

The frequency domain information may indicate a frequency granularity of the CSI report. The frequency granularity may include, for example, a wideband and a subband. The wideband is the entire CSI reporting band. The wideband may be the whole of a certain carrier (component carrier (CC), cell, serving cell), or may be the whole of a bandwidth part (BWP) in the certain carrier, for example. The wideband may be interpreted as CSI reporting band, the entire CSI reporting band, and the like.

The subband may be part of the wideband and constituted of one or more resource blocks (RBs) or physical resource blocks (PRBs). The size of the subband may be determined according to the size of the BWP (the number of PRBs).

The frequency domain information may indicate which of a wideband PMI or subband PMI is to be reported (for example, the frequency domain information may include an RRC IE “pmi-FormatIndicator” used to determine which of wideband PMI reporting or subband PMI reporting). The UE may determine the frequency granularity (in other words, wideband PMI reporting or subband PMI reporting) for the CSI report, based on at least one of the report quantity information and frequency domain information.

If wideband PMI reporting is configured (determined), one wideband PMI may be reported for the entire CSI reporting band. On the other hand, if subband PMI reporting is configured, a single wideband indication i1may be reported for the entire CSI reporting band, and a subband indication (one subband indication) i2for each of one or more subbands (for example, subband indication for each subband) in the entire CSI report may be reported.

The UE performs channel estimation by using the received RS to estimate a channel matrix H. The UE feeds back an index (PMI) determined based on the channel matrix estimated.

The PMI may indicate a precoder matrix (also simply referred to as a precoder) that the UE considers appropriate for the use for downlink (DL) transmission to the UE. Each value of the PMI may correspond to one precoder matrix. Sets of values of the PMI may correspond to different sets of precoder matrices referred to as precoder codebooks (also simply referred to as codebooks).

In the space domain, the CSI report may include one or more types of CSI. For example, the CSI may include at least one of a first type (Type 1 CSI) to be used in selection of a single beam and a second type (Type 2 CSI) to be used in selection of multi-beam. The single beam may be interpreted as a single layer, and the multi-beam may be interpreted as a plurality of beams. Type 1 CSI may be configured not to assume multi-user multiple input multiple output (MIMO) and Type 2 CSI may be configured to assume multi-user MIMO.

The codebook may include a codebook for Type 1 CSI (also referred to as Type 1 codebook or the like) and a codebook for Type 2 CSI (also referred to as Type 2 codebook or the like). Type 1 CSI may include Type 1 single-panel CSI and Type 1 multi-panel CSI, for which respective different codebooks (Type 1 single-panel codebook and Type 1 multi-panel codebook) may be specified.

In the present disclosure, Type 1 and Type I may be interchangeably interpreted. In the present disclosure, Type 2 and Type II may be interchangeably interpreted.

An uplink control information (UCI) type may include at least one of a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), a scheduling request (SR), and CSI. The UCI may be delivered on a PUCCH, or may be delivered on a PUSCH.

In Rel-15 NR, the UCI may include one CSI part for wideband PMI feedback. CSI report #n includes PMI wideband information, if reported.

In Rel-15 NR, the UCI may include two CSI parts for subband PMI feedback. CSI part 1 includes wideband PMI information. CSI part 2 includes single wideband PMI information and some subband PMI information. CSI part 1 and CSI part 2 are coded separately.

In Rel-15 NR, the UE may be configured with reporting setting of N (N≥1) CSI report configurations and resource setting of M (M≥1) CSI resource configurations, by a higher layer. For example, as shown inFIG.1, the CSI report configurations (CSI-ReportConfig) includes resource setting for channel measurement (resources ForChannelMeasurement), CSI-IM resource setting for interference (csi-IM-ResourceForInterference), NZP-CSI-RS setting for interference (nzp-CSI-RS-ResourceForInterference), report quantity (reportQuantity), and/or the like. Each of the resource setting for channel measurement, the CSI-IM resource setting for interference, and the NZP-CSI-RS setting for interference is associated with the CSI resource configurations (CSI-ResourceConfig, CSI-ResourceConfigId). The CSI resource configurations include a list of CSI-RS resources sets (csi-RS-ResourceSetList, for example, NZP-CSI-RS resource set or CSI-IM resource set).

When interference measurement is performed in the CSI-IM, each CSI-RS resource for channel measurement is associated with a CSI-IM resource per resource, in order of CSI-RS resources and CSI-IM resources in a corresponding resource set. The number of CSI-RS resources for channel measurement is equal to the number of CSI-IM resources.

In other words, for the interference measurement based on the CSI-IM, there is a one-to-one mapping between cannel measurement resources (CMRs) and interference measurement resources (IMRs).

When the UE is configured with a CSI report configuration having a report quantity (higher layer parameter “reportQuantity”) being set equal to ‘cri-RSRP’, ‘cri-RI-PMI-CQI’, ‘cri-RI-i1’, ‘cri-RI-i1-CQI’, ‘cri-RI-CQI’, or ‘cri-RI-LI-PMI-CQI’, and KS(KS>1) resources are configured in a corresponding resource set for channel measurement, the UE derives a CSI parameter other than the CRI with the reported CRI as a condition. CSI k (k≥0) corresponds to a (k+1)-th entry configured with an associated NZP-CSI-RS resource (nzp-CSI-RSResource) in a corresponding NZP-CSI-RS resource set (nzp-CSI-RS-ResourceSet) for channel measurement and, if configured, to a (k+1)-th entry configured with an associated CSI-IM resource (csi-IM-Resource) in a CSI-IM resource set (csi-IM-ResourceSet).

In other words, CSI k corresponds to a (k+1)-th CMR configured and a (k+1)-th IMR configured.

For both of FRI and FR2, in order to enable more dynamic channel/interference hypotheses for NCJT, evaluation and prescription for CSI reporting for DL transmission for at least one of multi-TRP and multi-panel are under study.

For NR, it is under study that one or a plurality of transmission/reception points (TRPs) (multiple TRPs (multi-TRP (M-TRP))) perform DL transmission to a UE by using one or a plurality of panels (multiple panels). It is also under study that the UE performs UL transmission to the one or the plurality of TRPs by using the one or the plurality of panels.

Note that the plurality of TRPs may correspond to the same cell identifier (ID) or may correspond to different cell IDs. The cell ID (s) may be physical cell ID(s) or may be virtual cell ID (s).

FIG.1is a diagram to show an example of a multi-TRP scenario. In shown examples, it is assumed that TRPs and UE each can use two different beams, but the examples are not limited to this.

Multiple TRPs (TRPs #0 and #1) may be connected to each other by means of an ideal/non-ideal backhaul, and information, data, and/or the like may be communicated between the multiple TRPs. Each TRP of the multiple TRPs may transmit a different codeword (Code Word (CW)) and a different layer. As one mode of the multi-TRP transmission, non-coherent joint transmission (NCJT) may be used.

In NCJT, for example, TRP #0 performs modulation mapping on a first codeword, performs layer mapping, and transmits a first PDSCH in layers of a first number (for example, two layers) by using first precoding. TRP #1 performs modulation mapping on a second codeword, performs layer mapping, and transmits a second PDSCH in layers of a second number (for example, two layers) by using second precoding.

Note that it may be defined that a plurality of PDSCHs (multiple PDSCHs) transmitted by NCJT partially or completely overlap in at least one of time and frequency domains. In other words, the first PDSCH from the first TRP #0 and the second PDSCH from the second TRP #1 may overlap in at least one of time and frequency resources.

The first PDSCH and second PDSCH may be assumed not to be in a quasi-co-location (QCL) relation (assumed to be not quasi-co-located). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs of a QCL type other than a given QCL type (for example, QCL type D).

Based on one or a plurality of DCI, the UE receives a plurality of PDSCHs (which may be referred to as multi-PDSCH (multiple PDSCHs)) from multiple TRPs. In the present example, for the different TRPs, the UE is assumed to separately transmit CSI reporting (CSI report) related to each of the TRPs. Such CSI feedback may be referred to as separate feedback, separate CSI feedback, and the like. Note that CSI feedback to transmit, to one TRP, a CSI report related to both TRPs may be referred to as joint feedback, joint CSI feedback, and the like.

InFIG.1, the UE is configured to transmit, to TRP #0, a CSI report for TRP #0 by using a given PUCCH (PUCCH 1) and transmit, to TRP #1, a CSI report for TRP #1 by using another PUCCH (PUCCH 2).

The multi-TRP scenario as described above allows more flexible transmission control using a high quality channel.

It is under study that options as below are supported for CSI reporting related to a multi-TRP/panel NCJT measurement hypothesis configured through single CSI report configuration.

The UE may be configured to perform reporting of X CSI/CSIs related to a single-TRP measurement hypothesis and single CSI related to a NCJT (or multi-TRP) measurement hypothesis. X may be configured/defined equal to a given value (for example, X=0, 1, 2).

With X=2, two CSIs may be related to two different single-TRP measurement hypotheses having channel measurement resources (CMRs) of different CMR groups. A case of X=1, 2 may be options for the UE that supports Option 1.

The UE may be configured to perform reporting of single CSI related to the best CSI in NCJT (or multi-TRP) and single-TRP measurement hypotheses.

The single CSI report configuration for multiple TRPs may correspond to both of Option 1 (for example, X=0/1/2) and Option 2.

(Mapping Order in CSI Field of CSI Report)

In an existing system (for example, Rel. 16 or earlier versions), mapping order of CSI fields of one CSI report is specified. For example, one or more parameters (or contents) are mapped to CSI fields of a given CSI report (for example, CSI report #n) based on a given order.

FIG.2shows an example of a table showing mapping order of CSI fields of CSI report #n specified in Rel. 16.FIG.2corresponds to mapping order of CSI fields of CSI report #n when a PMI format indicator indicates wideband PMI (for example, pmi-FormatIndicatro=widebandPMI) and a COI format indicator indicates wideband CQI (for example, cqi-Format Indicatro=widebandCQI).

FIG.3shows an example of a table showing mapping order of CSI fields of CSI report #n (CSI part 1) specified in Rel. 16.FIG.3corresponds to mapping order of CSI fields of CSI report #n (CSI part 1) when the PMI format indicator indicates subband PMI (for example, pmi-FormatIndicatro=subbandPMI) and the CQI format indicator indicates subband CQI (for example, cqi-Format Indicatro=subbandCQI).

FIG.4shows an example of a table showing mapping order of CSI fields of CSI report #n (CSI part 2 wideband) specified in Rel. 16.FIG.4corresponds to mapping order of CSI fields of CSI report #n (CSI part 2 wideband) when the PMI format indicator indicates subband PMI (for example, pmi-Format Indicatro=subbandPMI) or the COI format indicator indicates subband CQI (for example, cqi-Format Indicatro=subbandCQI).

FIG.5shows an example of a table showing mapping order of CSI fields of CSI report #n (CSI part 2 subband) specified in Rel. 16.FIG.5corresponds to mapping order of CSI fields of CSI report #n (CSI part 2 subband) when the PMI format indicator indicates subband PMI (for example, pmi-Format Indicatro=subbandPMI) or the COI format indicator indicates subband CQI (for example, cqi-Format Indicatro=subbandCQI).

FIGS.2to5each shows mapping order of CSI fields of a CSI report when the CSI report is to be transmitted using an uplink control channel (for example, PUCCH). In Rel. 16, mapping order of CSI fields of a CSI report when the CSI report is to be transmitted using an uplink shared channel (for example, PUSCH) is also defined similarly in a table.

(Mapping Order of CSI Reports to UCI Bit Sequence)

In an existing system (for example, Rel. 16 or earlier versions), mapping order of CSI reports to a UCI bit sequence (mapping order of CSI reports to UCI bit sequence) is specified. For example, one or more CSI reports are mapped to a given UCI bit sequence based on a given order.

FIG.6Ashows an example of a table showing mapping order of CSI reports to a UCI bit sequence specified in Rel. 16.FIG.6Acorresponds to mapping order of CSI reports to a UCI bit sequence when two-part CSI report is not applied (for example, without two-part CSI report (s)).

FIG.6Bshows another example of the table showing mapping order of CSI reports to a UCI bit sequence specified in Rel. 16.FIG.6Bcorresponds to mapping order of CSI reports to a first UCI bit sequence when two-part CSI report is applied (for example, with two-part CSI report (s)).

FIG.7shows another example of the table showing mapping order of CSI reports to a UCI bit sequence specified in Rel. 16.FIG.7corresponds to mapping order of CSI reports to a second UCI bit sequence when two-part CSI report is applied (for example, with two-part CSI report (s)).

FIGS.6A,6B, and7each shows mapping order of CSI reports to a UCI bit sequence when the CSI reports are to be transmitted using an uplink control channel (for example, PUCCH). In Rel. 16, mapping order of CSI reports to a UCI bit sequence when the CSI reports are to be transmitted using an uplink shared channel (for example, PUSCH) is also defined similarly in a table.

However, in the NR specifications thus far, studies have not sufficiently been made on control of CSI reporting when the multiple panels/multiple TRPs are used.

For example, CSI report #n is assumed to correspond to a single-TRP measurement hypothesis or a multi-TRP NCJT measurement hypothesis (for example, MTRP NCJT measurement hypothesis). However, regarding CSI report #n corresponding to the multi-TRP measurement hypothesis, such CSI report #n is assumed to include parameters/contents different from that of a CSI report in an existing system. In this case, a problem is how to control mapping order related to the CSI report.

In view of this, the inventors of the present invention studied on CSI reporting with a multi-TRP measurement hypothesis, and came up with the idea of a method of performing CSI reporting appropriately. According to one aspect of the present disclosure, the UE can appropriately perform CSI reporting including a multi-TRP measurement hypothesis.

Note that, in the present disclosure, “A/B” may mean “at least one of A and B.” “A/B/C” may mean “at least one of A, B, and C.”

In the present disclosure, activate, deactivate, indicate, select, configure, update, determine, and the like may be interchangeably interpreted.

In the present disclosure, RRC, an RRC parameter, an RRC message, a higher layer parameter, an information element (IE), and a configuration may be interchangeably interpreted. In the present disclosure, a MAC CE, an update command, and an activation/deactivation command may be interchangeably interpreted. In the present disclosure, “support,” “control,” “may control,” “operate,” and “may operate” may be interchangeably interpreted.

In the present disclosure, a panel, a beam, a panel group, a beam group, an Uplink (UL) transmission entity, a TRP, spatial relation information (SRI), a spatial relation, a control resource set (CORESET), a Physical Downlink Shared Channel (PDSCH), a codeword, a base station, a given antenna port (for example, a demodulation reference signal (DMRS) port), a given antenna port group (for example, a DMRS port group), a given group (for example, a code division multiplexing (CDM) group, a given reference signal group, or a CORESET group), a given resource (for example, a given reference signal resource), a given resource set (for example, a given reference signal resource set), a CORESET pool, a PUCCH group (PUCCH resource group), a spatial relation group, a downlink TCI state (DL TCI state), an uplink TCI state (UL TCI state), a unified TCI state, QCL, and the like may be interchangeably interpreted.

A TCI state Identifier (ID) and a TCI state may be interchangeably interpreted. A TCI state and a TCI may be interchangeably interpreted.

In the present disclosure, an index, an ID, an indicator, and a resource ID may be interchangeably interpreted. In the present disclosure, a sequence, a list, a set, a group, a cluster, a subset, and the like may be interchangeably interpreted.

In the present disclosure, a TRP index, a CORESET pool index (CORESETPoolIndex), a pool index, a group index, a CSI report setting group index, a CSI reporting group index, a CSI report configuration index, a CSI reporting setting group index, and a resource setting group index may be interchangeably interpreted.

The control on mapping of CSI reports (or CSI fields) in the present disclosure may be applied to both of a case where UCI (for example, UCI including at least CSI) is transmitted on a PUCCH (e.g., UCI on PUCCH) and a case where UCI is transmitted on a PUSCH (UCI on PUSCH).

The control on mapping of CSI reports (or CSI fields) in the present disclosure may be used when multiple TRPs are configured for a UE and may be used when the separate feedback is used for the CSI feedback (for the multiple TRPs). The control on mapping of CSI reports in the present disclosure may be used, without limited to the above, when the joint feedback is used.

In a first aspect, a case will be described in which given parameters corresponding to a plurality of TBs are reported in certain CSI report #n for a multi-TRP (or MTRP NCJT) measurement hypothesis. In the following description, a case will be described in which a given parameter corresponding to a first TB and a given parameter corresponding to a second TB are reported as the given parameters corresponding to the plurality of TBs, but the number of TBs are not limited to this.

The first TB may be interpreted as a first TRP or a first CORESET pool index. The second TB may be interpreted as a second TRP or a second CORESET pool index.

The given parameter may be interpreted as at least one of a given content, a given indicator, a given information field, and a given codebook index. In the following description, examples of the given parameter include a layer indicator (for example, Layer Indicator), a PMI wideband information field, a PMI subband information field, or a codebook index, but the given parameter is not limited to these.

In CSI report #n, when parameters/contents corresponding to the plurality of TBs/TRPs (for example, the first TB/TRP and second TB/TRP) are included, at least one of Option 1-1 to Option 1-3 as below may be applied as mapping order in CSI fields of CSI report #n.

Regarding contents included in CSI report #n, each of contents corresponding to the first TB may be allocated/mapped before a respective one of contents corresponding to the second TB. In other words, in units of contents, the mapping order for the first TB may be configured to be earlier than the mapping order for the second TB.

FIG.8shows an example of mapping order of CSI fields of CSI report #n when the PMI format indicator indicates wideband PMI (for example, pmi-Format Indicatro=widebandPMI) and the CQI format indicator indicates wideband CQI (for example, cqi-FormatIndicatro=widebandCQI).

For example, in a first content/parameter (for example, layer indicator (LI)) mapped to a CSI field, an LI corresponding to the first TB may be mapped before an LI corresponding to the second TB.

Similarly, in a second content/parameter (for example, PMI wideband information fields X1), a PMI wideband information field X1 corresponding to the first TB may be mapped before a PMI wideband information field X1 corresponding to the second TB. Also, in a third content/parameter (for example, PMI wideband information field X2 or CB index), a PMI wideband information field X2 or CB index corresponding to the first TB may be mapped before a PMI wideband information field X2 or CB index corresponding to the second TB.

The control may be performed such that the first TB is mapped before the second TB for all of the plurality of contents/parameters (for example, first to third contents/parameters) or the control may be performed such that the first TB is mapped before the second TB for some of the contents/parameters.

InFIG.8, a CRI field may include a joint CRI field. The joint CRI field may have a structure to indicate or include two CSI-RS resources (or two CMRs) for two TRPs.

An RI field may include a joint RI field. The joint RI field may have a structure to indicate or include two RI values for two TRPs. For example, with the maximum number of communication layers being four or less, {1, 1}, {1, 2}, {2, 1}, and {2, 2} may be supported as a combination of RIs in the joint RI field for the first TRP and second TRP.

Note that, similarly to the LI/PMI, the CRI field/RI field may also have a structure in which a CRI/RI corresponding to the first TB is mapped before a CRI/RI corresponding to the second TB, instead of the joint field.

InFIG.8, a wideband COI field corresponding to the first TB may include a wideband CQI corresponding to the first TB (or first TRP), and a wideband CQI field corresponding to the second TB may include a wideband COI corresponding to the second TB (or second TRP).

FIG.9shows an example of mapping order of CSI fields of CSI report #n (CSI part 2 wideband) when the PMI format indicator indicates subband PMI (for example, pmi-Format Indicatro=subbandPMI) or the COI format indicator indicates subband CQI (for example, cqi-Format Indicatro=subbandCQI).

For example, in a first content/parameter (for example, layer indicator (LI)) mapped to a CSI field, an LI corresponding to the first TB may be mapped before an LI corresponding to the second TB.

Similarly, in a second content/parameter (for example, PMI wideband information fields X1), a second content/parameter corresponding to the first TB may be mapped before a second content/parameter corresponding to the second TB. Also, in a third content/parameter (for example, PMI wideband information field X2 or CB index), a third content/parameter corresponding to the first TB may be mapped before a third content/parameter corresponding to the second TB.

The control may be performed such that the first TB is mapped before the second TB for all of the plurality of contents/parameters (for example, first to third contents/parameters). Alternatively, the control may be performed such that the first TB is mapped before the second TB for some of the contents/parameters.

InFIG.9, a wideband CQI field corresponding to the second TB may include a wideband COI corresponding to the second TB (or second TRP).

FIG.10shows an example of mapping order of CSI fields of CSI report #n (CSI part 2 subband) when the PMI format indicator indicates subband PMI (for example, pmi-FormatIndicatro=subbandPMI) or the COI format indicator indicates subband CQI (for example, cqi-Format Indicatro=subbandCQI).

For example, in a first content/parameter (for example, a PMI subband information field X2 of given even-numbered subbands or a CB index of given even-numbered subbands) mapped to a CSI field, a first content corresponding to the first TB may be mapped before a first content corresponding to the second TB.

Similarly, in a second content/parameter (for example, a PMI subband information field X2 of given odd-numbered subbands or a CB index of given odd-numbered subbands), a second content corresponding to the first TB may be mapped before a second content corresponding to the second TB.

The control may be performed such that the first TB is mapped before the second TB for all of the plurality of contents/parameters (for example, first to second contents/parameters). Alternatively, the control may be performed such that the first TB is mapped before the second TB for some of the contents/parameters.

InFIG.10, a subband differential CQI field corresponding to the second TB may include a COI corresponding to the second TB (or second TRP).

As described above, as shown in Option 1-1, in a field including a parameter corresponding to a plurality of TRPs, mapping order is controlled based on a corresponding TB index/TRP index, so that CSI reporting can be appropriately performed.

Regarding all sets of two parameters/contents corresponding to two TRPs included in CSI report #n, a set of contents corresponding to the first TB may be allocated/mapped before a set of contents corresponding to the second TB. In other words, with reference to a corresponding TB index/TRP index (regardless of a substance of a parameter/content), the control is performed such that a content corresponding to the first TB is allocated before a content corresponding to the second TB.

FIG.11shows an example of mapping order of CSI fields of CSI report #n when the PMI format indicator indicates wideband PMI (for example, pmi-Format Indicatro=widebandPMI) and the CQI format indicator indicates wideband CQI (for example, cqi-FormatIndicatro=widebandCQI).

For example, in a CSI field, an “LI”/“PMI wideband information field X1”/“PMI wideband information field X2 or CB index”/“wideband COI” corresponding to the first TB may be mapped before “LI”/“PMI wideband information field X1”/“PMI wideband information field X2 or CB index”/“wideband CQI” corresponding to the second TB.

In this case, a joint CRI/RI field may be mapped before an LI/PMI wideband information field X1/PMI wideband information field X2 or CB index/wideband CQI corresponding to the first TB.

FIG.12shows an example of mapping order of CSI fields of CSI report #n (CSI part 2 wideband) when the PMI format indicator indicates subband PMI (for example, pmi-Format Indicatro=subbandPMI) or the CQI format indicator indicates subband CQI (for example, cqi-Format Indicatro=subbandCQI).

For example, in a CSI field, an “LI”/“PMI wideband information field X1”/“PMI wideband information field X2 or CB index” corresponding to the first TB may be mapped before an “LI”/“PMI wideband information field X1”/“PMI wideband information field X2 or CB index” corresponding to the second TB.

A wideband CQI field corresponding to the second TB may be mapped before an “LI” corresponding to the second TB.

FIG.13shows an example of mapping order of CSI fields of CSI report #n (CSI part 2 subband) when the PMI format indicator indicates subband PMI (for example, pmi-Format Indicatro=subbandPMI) or the COI format indicator indicates subband CQI (for example, cqi-Format Indicatro=subbandCQI).

For example, in a CSI field, a “PMI subband information field X2 of given even-numbered subbands or CB index of given even-numbered subbands”/“PMI subband information field X2 of given odd-numbered subbands or CB index of given odd-numbered subbands” corresponding to the first TB may be mapped before a “PMI subband information field X2 of given even-numbered subbands or CB index of given even-numbered subbands”/“PMI subband information field X2 of given odd-numbered subbands or CB index of given odd-numbered subbands” corresponding to the second TB.

The control may be performed such that a subband differential CQI (even-numbered subband) for the second TB/subband differential CQI (odd-numbered subband) for the second TB may be mapped after a parameter corresponding to the first TB.

Option 1-1 and Option 1-2 may be combined to be applied. For example, Option 1-1 may be applied for certain one or more fields included in CSI report #n, and Option 1-2 may be applied for the other plurality of fields.

FIGS.14and15each show an example of mapping order of CSI fields of CSI report #n when the PMI format indicator indicates wideband PMI (for example, pmi-FormatIndicatro=widebandPMI) and the COI format indicator indicates wideband COI (for example, cqi-Format Indicatro=widebandCQI).

For example, in a CSI field, Option 1-1 may be applied for a first content/parameter (for example, layer indicator (LI)), and Option 1-2 may be applied for a combination of a second content/parameter (for example, PMI wideband information field X1) and a third content/parameter (for example, PMI wideband information field X2 or CB index) (seeFIG.14).

Alternatively, Option 1-2 may be applied for the second content/parameter (for example, PMI wideband information field X1), the third content/parameter (for example, PMI wideband information field X2 or CB index), and a fourth content/parameter (for example, wideband CQI field) (seeFIG.15).

As described above, fields for which Option 1-1 and Option 1-2 are to be applied are determined separately, so that mapping order can be flexibly controlled.

FIGS.16and17each shows an example of mapping order of CSI fields of CSI report #n (CSI part 2 wideband) when the PMI format indicator indicates subband PMI (for example, pmi-Format Indicatro=subbandPMI) or the COI format indicator indicates subband CQI (for example, cqi-Format Indicatro=subbandCQI).

For example, in a CSI field, Option 1-1 may be applied for a first content/parameter (for example, layer indicator (LI)), and Option 1-2 may be applied for a combination of a second content/parameter (for example, PMI wideband information field X1) and a third content/parameter (for example, PMI wideband information field X2 or CB index) (seeFIG.16).

Alternatively, Option 1-2 may be applied for a combination of the first content/parameter (for example, layer indicator (LI)), the second content/parameter (for example, PMI wideband information field X1), and the third content/parameter (for example, PMI wideband information field X2 or CB index) (seeFIG.17). In this case, a fourth content/parameter (for example, wideband COI field) corresponding to the second TB may be mapped before the first content/parameter corresponding to the first TB.

FIG.18shows an example of mapping order of CSI fields of CSI report #n (CSI part 2 subband) when the PMI format indicator indicates subband PMI (for example, pmi-Format Indicatro=subbandPMI) or the COI format indicator indicates subband CQI (for example, cqi-Format Indicatro=subbandCQI).

For example, in a CSI field, Option 1-2 may be applied for a combination of a first content/parameter (for example, PMI subband information field X2 of given even-numbered subbands or CB index of given even-numbered subbands) and a second content/parameter (for example, PMI subband information field X2 of given odd-numbered subbands or CB index of given odd-numbered subbands) (seeFIG.18).

A subband differential COI (odd-numbered subband/even-numbered subband) field corresponding to the second TB may be mapped before a parameter corresponding to the first TB or may be mapped after the parameter corresponding to the first TB.

Variations

In the description above, a case is described in which mapping order is determined based on a TB index/TRP index, but the present disclosure is not limited to this.

For example, regarding different contents/parameters, the control may be performed such that contents/parameters corresponding to the first TB and second TB are consecutively mapped.

FIG.19shows an example of mapping order of CSI fields of CSI report #n (CSI part 2 subband) when the PMI format indicator indicates subband PMI (for example, pmi-Format Indicatro=subbandPMI) or the COI format indicator indicates subband CQI (for example, cqi-Format Indicatro=subbandCQI).

For example, in a CSI field, a first content/parameter (for example, PMI subband information field X2 of given even-numbered subbands or CB index of given even-numbered subbands) corresponding to the first TB and a second content/parameter (for example, PMI subband information field X2 of given odd-numbered subbands or CB index of given odd-numbered subbands) corresponding to the second TB are mapped consecutively. Similarly, a second content/parameter corresponding to the first TB and a first content/parameter corresponding to the second TB may be mapped consecutively.

In a table defined in an existing system, a parameter corresponding to a given TB (for example, first TB/second TB) may include substance of report for the given TB (TRP).

FIG.20corresponds to mapping order of CSI fields of CSI report #n (CSI part 1) when the PMI format indicator indicates subband PMI (for example, pmi-Format Indicatro=subbandPMI) and the COI format indicator indicates subband COI (for example, cqi-FormatIndicatro=subbandCQI). Here, a wideband COI field may include a CQI corresponding to the first TB (or forst TRP), and a subband differential COI field may include a COI corresponding to the first TB (or first TRP). A CRI field/RI field may include a joint CRI field/joint RI field.

A structure may be used in which a given parameter (for example, LI/PMI) for the second TB (or second TRP) of CSI report #n is present only when the CRI report (for example, CRI reporting) indicates that CSI report #n is for multi-TRP (or NCJT) measurement hypothesis.

In this case, the UE/base station may understand a certain parameter (for example, RI) as indication of joint of two RI fields.

In this case, a COI for the second TB (second TRP) may be configured to be present in any rank (for example, rank<4).

A table when UCI is transmitted using a PUCCH is described for Option 1-1 to Option 1-3, but the present disclosure is not limited to this. Option 1-1 to Option 1-3 may be also applied for a table when UCI is transmitted using a PUSCH (UCI on PUSCH).

As described above, when reporting of CSI (or measurement hypothesis) is performed for a plurality of TRPs, a given content/parameter of a CSI field includes contents corresponding to the first TB/TRP and second TB/TRP. In this case, mapping order in CSI fields is determined based on a given condition, so that CSI reporting can be appropriately performed even when measurement hypotheses for the plurality of TRPs are to be reported.

Note that, when CSI reporting including a single-TRP measurement hypothesis is performed, a mechanism in an existing system may be reused, regarding contents to be included in parameters in CSI fields/mapping order.

In a second aspect, regarding a certain parameter/content in CSI reporting, a case will be described in which reporting is performed in common/jointly between a plurality of TBs/TRPs (for example, first TB/TRP and second TB/TRP). Note that, in the following description, RI or PMI will be described as an example of a parameter/content, but the parameter/content applicable is not limited to this. The second aspect may be applied in combination with the first aspect (for example, may be applied for the table described in the first aspect).

For CSI for NCJT (or multi-TRP), RI sharing may be configured/activated/indicated by RRC. In this case, the UE may perform control to report a common RI for a plurality of (for example, two) TRPs.

When joint RI reporting is configured, a joint RI to be reported may be limited (Option 2-1). For example, the joint RI may be configured to indicate only a combination of two same values. As an example, as the joint RI, either of {1, 1} or {2, 2} may be reported.

Alternatively, as the joint RI, a single RI value may be reported (Option 2-2). In this case, the single RI may be configured to be used for/correspond to CSI of a plurality of (for example, two) TRPs. This allows an increase in overhead of the RI field to be suppressed.

For CSI for NCJT (or multi-TRP), PMI sharing may be configured/activated/indicated by RRC. In this case, configuration with reporting of a PMI/LI for the second TB (second TRP) being omitted may be employed.

When the PMI sharing is applied, the UE may perform control not to perform reporting of the PMI/LI for the second TB (or second TRP). In this case, a table defined in an existing system (for example, Rel. 16) may be applied to control CSI reporting. In a table defined in an existing system, a CRI/RI may be interpreted as a joint CRI/joint RI.

Configuration may be employed in which, when the PMI sharing is not configured for CSI for NCJT (or multi-TRP), reporting of a PMI/LI for the second TB (second TRP) is necessary.

When the PMI sharing is not applied, the UE may perform control to perform reporting of the PMI/LI for the second TB (second TRP). In this case, the table described in the first aspect may be used to control CSI reporting.

As described above, substance to be included in a PMI are changed depending on whether PMI sharing is configured/used/activated, so that substance of CSI reporting can be flexibly controlled.

The radio communication system1may support dual connectivity between a plurality of base stations in the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both of an MN and an SN are base stations (gNB) of NR).

The radio communication system1may include a base station11that forms a macro cell C1of a relatively wide coverage, and base stations12(12ato12c) that form small cells C2, which are placed within the macro cell C1and which are narrower than the macro cell C1. The user terminal20may be located in at least one cell. The arrangement, the number, and the like of each cell and user terminal20are by no means limited to the aspect shown in the diagram. Hereinafter, the base stations11and12will be collectively referred to as “base stations10,” unless specified otherwise.

The user terminal20may be connected to at least one of the plurality of base stations10. The user terminal20may use at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).

Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1may be included in FR1, and the small cells C2may be included in FR2. For example, FRI may be a frequency band of 6 GHz or less (sub-6 GHZ), and FR2 may be a frequency band which is higher than 24 GHZ (above-24 GHz). Note that frequency bands, definitions and so on of FRI and FR2 are by no means limited to these, and for example, FRI may correspond to a frequency band which is higher than FR2.

The user terminal20may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

The plurality of base stations10may be connected by a wired connection (for example, optical fiber in compliance with the Common Public Radio Interface (CPRI), the X2 interface and so on) or a wireless connection (for example, an NR communication). For example, if an NR communication is used as a backhaul between the base stations11and12, the base station11corresponding to a higher station may be referred to as an “Integrated Access Backhaul (IAB) donor,” and the base station12corresponding to a relay station (relay) may be referred to as an “IAB node.”

The base station10may be connected to a core network30through another base station10or directly. For example, the core network30may include at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), and so on.

The user terminal20may be a terminal supporting at least one of communication schemes such as LTE, LTE-A, 5G, and so on.

In the radio communication system1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), which is used by each user terminal20on a shared basis, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)) and so on, may be used as downlink channels.

In the radio communication system1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), which is used by each user terminal20on a shared basis, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)) and so on may be used as uplink channels.

User data, higher layer control information, System Information Blocks (SIBs) and so on are transmitted on the PDSCH. User data, higher layer control information and so on may be transmitted on the PUSCH. The Master Information Blocks (MIBs) may be transmitted on the PBCH.

Lower layer control information may be transmitted on the PDCCH. For example, the lower layer control information may include downlink control information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

Uplink control information (UCI) including at least one of channel state information (CSI), transmission confirmation information (for example, which may be also referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, and so on), and scheduling request (SR) may be transmitted by means of the PUCCH. By means of the PRACH, random access preambles for establishing connections with cells may be transmitted.

In the radio communication system1, a synchronization signal (SS), a downlink reference signal (DL-RS), and so on may be transmitted. In the radio communication system1, a cell-specific reference signal (CRS), a channel state information-reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), and so on may be transmitted as the DL-RS.

In the radio communication system1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), and so on may be transmitted as an uplink reference signal (UL-RS). Note that DMRS may be referred to as a “user terminal specific reference signal (UE-specific Reference Signal).”

FIG.22is a diagram to show an example of a structure of the base station according to one embodiment. The base station10includes a control section110, a transmitting/receiving section120, transmitting/receiving antennas130and a transmission line interface140. Note that the base station10may include one or more control sections110, one or more transmitting/receiving sections120, one or more transmitting/receiving antennas130, and one or more transmission line interfaces140.

Note that, the present example primarily shows functional blocks that pertain to characteristic parts of the present embodiment, and it is assumed that the base station10may include other functional blocks that are necessary for radio communication as well. Part of the processes of each section described below may be omitted.

The control section110controls the whole of the base station10. The control section110can be constituted with a controller, a control circuit, or the like described based on general understanding of the technical field to which the present disclosure pertains.

The control section110may control generation of signals, scheduling (for example, resource allocation, mapping), and so on. The control section110may control transmission and reception, measurement and so on using the transmitting/receiving section120, the transmitting/receiving antennas130, and the transmission line interface140. The control section110may generate data, control information, a sequence and so on to transmit as a signal, and forward the generated items to the transmitting/receiving section120. The control section110may perform call processing (setting up, releasing) for communication channels, manage the state of the base station10, and manage the radio resources.

The transmitting/receiving section120may include a baseband section121, a Radio Frequency (RF) section122, and a measurement section123. The baseband section121may include a transmission processing section1211and a reception processing section1212. The transmitting/receiving section120can be constituted with a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, or the like described based on general understanding of the technical field to which the present disclosure pertains.

The transmitting/receiving section120may be structured as a transmitting/receiving section in one entity, or may be constituted with a transmitting section and a receiving section. The transmitting section may be constituted with the transmission processing section1211, and the RF section122. The receiving section may be constituted with the reception processing section1212, the RF section122, and the measurement section123.

The transmitting/receiving antennas130can be constituted with antennas, for example, an array antenna, or the like described based on general understanding of the technical field to which the present disclosure pertains.

The transmitting/receiving section120may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and so on. The transmitting/receiving section120may receive the above-described uplink channel, uplink reference signal, and so on.

The transmitting/receiving section120may form at least one of a transmit beam and a receive beam by using digital beam forming (for example, precoding), analog beam forming (for example, phase rotation), and so on.

The transmitting/receiving section120(transmission processing section1211) may perform the processing of the Packet Data Convergence Protocol (PDCP) layer, the processing of the Radio Link Control (RLC) layer (for example, RLC retransmission control), the processing of the Medium Access Control (MAC) layer (for example, HARQ retransmission control), and so on, for example, on data and control information and so on acquired from the control section110, and may generate bit string to transmit.

The transmitting/receiving section120(transmission processing section1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (as necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-to-analog conversion, and so on, on the bit string to transmit, and output a baseband signal.

The transmitting/receiving section120(RF section122) may perform modulation to a radio frequency band, filtering, amplification, and so on, on the baseband signal, and transmit the signal of the radio frequency band through the transmitting/receiving antennas130.

On the other hand, the transmitting/receiving section120(RF section122) may perform amplification, filtering, demodulation to a baseband signal, and so on, on the signal of the radio frequency band received by the transmitting/receiving antennas130.

The transmitting/receiving section120(reception processing section1212) may apply reception processing such as analog-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as necessary), filtering, de-mapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, the processing of the RLC layer and the processing of the PDCP layer, and so on, on the acquired baseband signal, and acquire user data, and so on.

The transmitting/receiving section120(measurement section123) may perform the measurement related to the received signal. For example, the measurement section123may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, and so on, based on the received signal. The measurement section123may measure a received power (for example, Reference Signal Received Power (RSRP)), a received quality (for example, Reference Signal Received Quality (RSRQ), a Signal to Interference plus Noise Ratio (SINR), a Signal to Noise Ratio (SNR)), a signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and so on. The measurement results may be output to the control section110.

The transmission line interface140may perform transmission/reception (backhaul signaling) of a signal with an apparatus included in the core network30or other base stations10, and so on, and acquire or transmit user data (user plane data), control plane data, and so on for the user terminal20.

Note that the transmitting section and the receiving section of the base station10in the present disclosure may be constituted with at least one of the transmitting/receiving section120, the transmitting/receiving antennas130, and the transmission line interface140.

The transmitting/receiving section120may receive a CSI report.

The control section110may control reception of a CSI report in which mapping order of CSI fields is determined based on at least one of a corresponding transport block (TB) index and TRP index, the CSI report including information related to measurement of a plurality of transmission/reception points (TRPs).

FIG.23is a diagram to show an example of a structure of the user terminal according to one embodiment. The user terminal20includes a control section210, a transmitting/receiving section220, and transmitting/receiving antennas230. Note that the user terminal20may include one or more control sections210, one or more transmitting/receiving sections220, and one or more transmitting/receiving antennas230.

Note that, the present example primarily shows functional blocks that pertain to characteristic parts of the present embodiment, and it is assumed that the user terminal20may include other functional blocks that are necessary for radio communication as well. Part of the processes of each section described below may be omitted.

The control section210controls the whole of the user terminal20. The control section210can be constituted with a controller, a control circuit, or the like described based on general understanding of the technical field to which the present disclosure pertains.

The control section210may control generation of signals, mapping, and so on. The control section210may control transmission/reception, measurement and so on using the transmitting/receiving section220, and the transmitting/receiving antennas230. The control section210generates data, control information, a sequence and so on to transmit as a signal, and may forward the generated items to the transmitting/receiving section220.

The transmitting/receiving section220may include a baseband section221, an RF section222, and a measurement section223. The baseband section221may include a transmission processing section2211and a reception processing section2212. The transmitting/receiving section220can be constituted with a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, or the like described based on general understanding of the technical field to which the present disclosure pertains.

The transmitting/receiving section220may be structured as a transmitting/receiving section in one entity, or may be constituted with a transmitting section and a receiving section. The transmitting section may be constituted with the transmission processing section2211, and the RF section222. The receiving section may be constituted with the reception processing section2212, the RF section222, and the measurement section223.

The transmitting/receiving antennas230can be constituted with antennas, for example, an array antenna, or the like described based on general understanding of the technical field to which the present disclosure pertains.

The transmitting/receiving section220may receive the above-described downlink channel, synchronization signal, downlink reference signal, and so on. The transmitting/receiving section220may transmit the above-described uplink channel, uplink reference signal, and so on.

The transmitting/receiving section220may form at least one of a transmit beam and a receive beam by using digital beam forming (for example, precoding), analog beam forming (for example, phase rotation), and so on.

The transmitting/receiving section220(transmission processing section2211) may perform the processing of the PDCP layer, the processing of the RLC layer (for example, RLC retransmission control), the processing of the MAC layer (for example, HARQ retransmission control), and so on, for example, on data and control information and so on acquired from the control section210, and may generate bit string to transmit.

The transmitting/receiving section220(transmission processing section2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DET processing (as necessary), IFFT processing, precoding, digital-to-analog conversion, and so on, on the bit string to transmit, and output a baseband signal.

The transmitting/receiving section220(RF section222) may perform modulation to a radio frequency band, filtering, amplification, and so on, on the baseband signal, and transmit the signal of the radio frequency band through the transmitting/receiving antennas230.

On the other hand, the transmitting/receiving section220(RF section222) may perform amplification, filtering, demodulation to a baseband signal, and so on, on the signal of the radio frequency band received by the transmitting/receiving antennas230.

The transmitting/receiving section220(measurement section223) may perform the measurement related to the received signal. For example, the measurement section223may perform RRM measurement, CSI measurement, and so on, based on the received signal. The measurement section223may measure a received power (for example, RSRP), a received quality (for example, RSRQ, SINR, SNR), a signal strength (for example, RSSI), channel information (for example, CSI), and so on. The measurement results may be output to the control section210.

Note that the transmitting section and the receiving section of the user terminal20in the present disclosure may be constituted with at least one of the transmitting/receiving section220and the transmitting/receiving antennas230.

The transmitting/receiving section220may transmit a CSI report.

The control section210may control mapping order of CSI fields included in a CSI report including information related to measurement of a plurality of transmission/reception points (TRPs), based on at least one of a substance of a parameter and a corresponding transport block (TB) index or TRP index.

The control section210may perform control to map, for each of given parameters included in a CSI report, a first TB or TRP before a second TB or TRP having a large index compared to the first TB or TRP.

The control section210may map, regardless of a substance of a given parameter included in the CSI report, a parameter corresponding to the first TB or TRP before a parameter corresponding to the second TB or TRP having a large index compared to the first TB or TRP.

Sharing of a given parameter may be configured for the CSI report for the plurality of TRPs.

Note that in the present disclosure, the words such as an apparatus, a circuit, a device, a section, a unit, and so on can be interchangeably interpreted. The hardware structure of the base station10and the user terminal20may be configured to include one or more of apparatuses shown in the drawings, or may be configured not to include part of apparatuses.

For example, although only one processor1001is shown, a plurality of processors may be provided. Furthermore, processes may be implemented with one processor or may be implemented at the same time, in sequence, or in different manners with two or more processors. Note that the processor1001may be implemented with one or more chips.

The processor1001controls the whole computer by, for example, running an operating system. The processor1001may be configured with a central processing unit (CPU), which includes interfaces with peripheral apparatus, control apparatus, computing apparatus, a register, and so on. For example, at least part of the above-described control section110(210), the transmitting/receiving section120(220), and so on may be implemented by the processor1001.

Furthermore, the processor1001reads programs (program codes), software modules, data, and so on from at least one of the storage1003and the communication apparatus1004, into the memory1002, and executes various processes according to these. As for the programs, programs to allow computers to execute at least part of the operations of the above-described embodiments are used. For example, the control section110(210) may be implemented by control programs that are stored in the memory1002and that operate on the processor1001, and other functional blocks may be implemented likewise.

The storage1003is a computer-readable recording medium, and may be constituted with, for example, at least one of a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disc (Compact Disc ROM (CD-ROM) and so on), a digital versatile disc, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (for example, a card, a stick, and a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage1003may be referred to as “secondary storage apparatus.”

The communication apparatus1004is hardware (transmitting/receiving device) for allowing inter-computer communication via at least one of wired and wireless networks, and may be referred to as, for example, a “network device,” a “network controller,” a “network card,” a “communication module,” and so on. The communication apparatus1004may be configured to include a high frequency switch, a duplexer, a filter, a frequency synthesizer, and so on in order to realize, for example, at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-described transmitting/receiving section120(220), the transmitting/receiving antennas130(230), and so on may be implemented by the communication apparatus1004. In the transmitting/receiving section120(220), the transmitting section120a(220a) and the receiving section120b(220b) can be implemented while being separated physically or logically.

Also, the base station10and the user terminals20may be structured to include hardware such as a microprocessor, a digital signal processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and so on, and part or all of the functional blocks may be implemented by the hardware. For example, the processor1001may be implemented with at least one of these pieces of hardware.

Variations

Here, numerology may be a communication parameter applied to at least one of transmission and reception of a given signal or channel. For example, numerology may indicate at least one of a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a particular filter processing performed by a transceiver in the frequency domain, a particular windowing processing performed by a transceiver in the time domain, and so on.

A bandwidth part (BWP) (which may be referred to as a “fractional bandwidth,” and so on) may represent a subset of contiguous common resource blocks (common RBs) for certain numerology in a certain carrier. Here, a common RB may be specified by an index of the RB based on the common reference point of the carrier. A PRB may be defined by a certain BWP and may be numbered in the BWP.

Also, the information, parameters, and so on described in the present disclosure may be represented in absolute values or in relative values with respect to given values, or may be represented in another corresponding information. For example, radio resources may be specified by given indices.

Also, reporting of given information (for example, reporting of “being X”) does not necessarily have to be reported explicitly, and can be reported implicitly (by, for example, not reporting this given information or notifying another piece of information).

At least one of a base station and a mobile station may be referred to as a “transmitting apparatus,” a “receiving apparatus,” a “radio communication apparatus,” and so on. Note that at least one of a base station and a mobile station may be device mounted on a moving object or a moving object itself, and so on. The moving object may be a vehicle (for example, a car, an airplane, and the like), may be a moving object which moves unmanned (for example, a drone, an automatic operation car, and the like), or may be a robot (a manned type or unmanned type). Note that at least one of a base station and a mobile station also includes an apparatus which does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor, and the like.

Likewise, the user terminal in the present disclosure may be interpreted as base station. In this case, the base station10may have the functions of the user terminal20described above.

Actions which have been described in the present disclosure to be performed by a base station may, in some cases, be performed by upper nodes. In a network including one or a plurality of network nodes with base stations, it is clear that various operations that are performed to communicate with terminals can be performed by base stations, one or more network nodes (for example, Mobility Management Entities (MMEs), Serving-Gateways (S-GWs), and so on may be possible, but these are not limiting) other than base stations, or combinations of these.