Terminal, wireless communication method, base station and system

Abstract

A terminal according to one embodiment of the present disclosure comprises: a reception unit that receives a plurality of configurations for measuring and reporting channel state information (CSI), the plurality of configurations corresponding to two or more transmission / reception points; and a control unit that performs CSI measurement and reporting based on the plurality of configurations. This embodiment of the present disclosure makes it possible to suitably perform measurement and reporting of CSI for multipanel / TRPs.

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 technology]

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

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), New Radio (NR), 3GPP Rel. 15 or later) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] In future wireless communication systems (e.g., NR), it is being considered that user terminals (User Equipment (UE)) will control transmission and reception processing based on information regarding quasi-co-location (QCL).

[0006] In addition, in NR, it is being considered that one or more transmission / reception points (TRPs) (multi-TRPs) will perform DL transmission (e.g., PDSCH transmission) to a UE using one or more panels (multi-panels).

[0007] However, because the NR specifications to date have not taken multi-panel / TRP into consideration, it is unclear how to measure and report CSI when multi-panel / TRP is used. If CSI is not measured and reported appropriately, there is a risk that system performance will be degraded, such as a decrease in throughput.

[0008] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately measure and report CSI for a multi-panel / TRP. [Means for solving the problem]

[0009] A terminal according to an embodiment of the present disclosure includes: a plurality of groups of resources for channel measurement associated with a plurality of transmission / reception points (TRPs); Setting and each of the plurality of groups is associated with one or more groups. Different types One or more Channel State Information (CSI) parameters a number related to the one or more CSI parameters to be reported to the base station, setting and, and a control unit that controls reporting of the one or more CSI parameters based on the setting, teeth, The CSI parameters Number of items Receive the setting death , The control unit isThe indexes corresponding to the groups are added to each report in ascending order. One or more Map CSI parameters. Effect of the Invention

[0010] According to one embodiment of the present disclosure, CSI for a multi-panel / TRP can be appropriately measured and reported. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an example of CSI reporting configuration in Rel.15 NR. [Diagram 2] 2A-2D are diagrams illustrating an example of PDSCH transmission using multiple TRPs. [Diagram 3] FIG. 3 is a diagram illustrating an example of a CSI reporting configuration according to the first embodiment. [Figure 4] FIG. 4 is a diagram showing a first example of a structure of a CSI reporting configuration. [Diagram 5] FIG. 5 is a diagram showing a second example of a structure of a CSI reporting configuration. [Figure 6] FIG. 6 is a diagram showing a third example of a structure of a CSI reporting configuration. [Figure 7] FIG. 7 is a diagram illustrating an example of a CSI reporting configuration according to interference-presumed association 1 of embodiment 1-2. [Figure 8] FIG. 8 is a diagram illustrating an example of configuration of CSI report #1 for TRP #1 related to interference-presumed association 1 in embodiment 1-2. [Figure 9] FIG. 9 is a diagram illustrating an example of a configuration of CSI report #2 for TRP #2 related to interference-presumed association 1 in embodiment 1-2. [Figure 10] 10A and 10B are diagrams illustrating an example of a CSI reporting configuration related to interference-presumed association 2 in embodiment 1-2. [Figure 11] FIG. 11 is a diagram illustrating an example of a CSI field according to interference-based association 2 in embodiment 1-2. [Figure 12]FIG. 12 is a diagram illustrating another example of a CSI field according to the interference-based association 2 of embodiment 1-2. [Figure 13] FIG. 13 is a diagram illustrating an example of configuration of CSI report #1 for TRP #1 related to interference-presumed association 2 in embodiment 1-2. [Figure 14] FIG. 14 is a diagram illustrating an example of a configuration of CSI report #2 for TRP #2 related to interference-presumed association 2 in embodiment 1-2. [Figure 15] FIG. 15 is a diagram illustrating an example of a CSI reporting configuration according to embodiment 2-1. [Figure 16] FIG. 16 is a diagram illustrating an example of a CSI reporting configuration related to interference-presumed association 1 of embodiment 2-2. [Figure 17] FIG. 17 is a diagram illustrating an example of a CSI field according to interference-presumed association 1 of embodiment 2-2. [Figure 18] FIG. 18 is a diagram illustrating another example of a CSI field according to interference-based association 1 of embodiment 2-2. [Figure 19] FIG. 19 is a diagram illustrating an example of configuration of CSI report #1 for interference premise #1 in interference premise association 1 of embodiment 2-2. [Figure 20] FIG. 20 is a diagram illustrating an example of configuration of CSI report #2 for interference premise #2 according to interference premise association 1 of embodiment 2-2. [Figure 21] FIG. 21 is a diagram illustrating an example of a CSI reporting configuration related to interference-presumed association 1 of embodiment 2-2. [Figure 22] FIG. 22 is a diagram illustrating an example of configuration for interference premise #1 among configurations of CSI report #1 related to interference premise association 2 in embodiment 2-2. [Figure 23] FIG. 23 is a diagram illustrating an example of configuration for interference premise #2 among configurations of CSI report #1 related to interference premise association 2 in embodiment 2-2. [Figure 24] FIG. 24 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Diagram 25]FIG. 25 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 26] FIG. 26 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 27] FIG. 27 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] (CSI report or reporting) In Rel.15 NR, a terminal (also referred to as a user terminal, User Equipment (UE), etc.) generates (also referred to as determining, calculating, estimating, measuring, etc.) channel state information (CSI) based on a reference signal (RS) (or a resource for the RS), and transmits (also referred to as reporting, feeding back, etc.) the generated CSI to a network (e.g., a base station). The CSI may be transmitted to the base station, for example, using an uplink control channel (e.g., a Physical Uplink Control Channel (PUCCH)) or an uplink shared channel (e.g., a Physical Uplink Shared Channel (PUSCH)).

[0013] The RS used to generate CSI may 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), etc.

[0014] The CSI-RS may 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 an SS and a PBCH (and a corresponding DMRS), and may be referred to as an SS block (SSB), etc. The SS may include at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).

[0015] The CSI may include at least one parameter (CSI parameter) such as a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a SS / PBCH Block Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal-to-Noise and Interference Ratio or Signal to Interference plus Noise Ratio), and L1-SNR (Signal to Noise Ratio).

[0016] The UE may receive information on CSI reporting (report configuration information) and control the CSI reporting based on the report configuration information. The report configuration information may be, for example, "CSI-ReportConfig" of an information element (IE) of Radio Resource Control (RRC). In the present disclosure, the RRC IE may be rephrased as an RRC parameter, a higher layer parameter, or the like.

[0017] The reporting configuration information (eg, the RRC IE "CSI-ReportConfig") may include, for example, at least one of the following: Information about the type of CSI report (report type information, e.g., RRC IE "reportConfigType") Information on one or more quantities of CSI to be reported (one or more CSI parameters) (report quantity information, e.g., RRC IE "reportQuantity") Information on the RS resource used to generate the amount (the CSI parameter) (resource information, for example, the RRC IE "CSI-ResourceConfigId") Information about the frequency domain for which CSI is reported (frequency domain information, e.g., RRC IE "reportFreqConfiguration")

[0018] For example, the report type information may indicate a periodic CSI (P-CSI) report, an aperiodic CSI (A-CSI) report, or a semi-persistent CSI (SP-CSI) report.

[0019] Furthermore, the reporting amount information may specify at least one combination of the above CSI parameters (for example, CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0020] The resource information may also be an ID of a resource for RS. The resource for RS may include, for example, a non-zero power CSI-RS resource or an SSB, and a CSI-IM resource (for example, a zero power CSI-RS resource).

[0021] The frequency domain information may also indicate 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, for example, the entirety of a certain carrier (a component carrier (CC)), a cell, a serving cell), or the entirety of a bandwidth part (BWP) in a certain carrier. The wideband may be rephrased as a CSI reporting band, the entire CSI reporting band, or the like.

[0022] Also, a subband is a part of a wideband and may be composed of one or more resource blocks (RBs or PRBs). The size of the subband may be determined according to the size of the BWP (the number of PRBs).

[0023] The frequency domain information may indicate whether wideband or subband PMI is to be reported (for example, the frequency domain information may include an RRC IE "pmi-FormatIndicator" used to determine whether wideband PMI reporting or subband PMI reporting is to be performed). The UE may determine the frequency granularity of the CSI report (i.e., whether wideband PMI reporting or subband PMI reporting) based on at least one of the above-mentioned reporting amount information and frequency domain information.

[0024] If wideband PMI reporting is configured, one wideband PMI may be reported for the entire CSI reporting band, whereas if subband PMI reporting is configured, a single wideband indication i 1 is reported for the entire CSI reporting band, and one subband indication i for each of one or more subbands within the entire CSI report 2 (eg, a subband representation for each subband) may be reported.

[0025] The UE performs channel estimation using the received RS to estimate a channel matrix H. The UE feeds back a propagation mediation index (PMI) that is determined based on the estimated channel matrix.

[0026] The PMI may indicate a precoder matrix (also referred to as a precoder) that the UE considers appropriate for use in downlink (DL) transmission to the UE. Each value of the PMI may correspond to one precoder matrix. A set of values ​​of the PMI may correspond to a set of different precoder matrices called a precoder codebook (also referred to as a codebook).

[0027] In the space domain, a 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) used for selecting a single beam and a second type (type-2 CSI) used for selecting a multi-beam. A single beam may be rephrased as a single layer, and a multi-beam may be rephrased as multiple beams. In addition, type-1 CSI does not assume multi-user multiple input multiple output (MIMO), and type-2 CSI may assume multi-user MIMO.

[0028] The codebook may include 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.). Furthermore, the type-1 CSI may include type-1 single-panel CSI and type-1 multi-panel CSI, and different codebooks (type-1 single-panel codebook, type-1 multi-panel codebook) may be defined for each.

[0029] In the present disclosure, Type 1 and Type I may be interpreted as interchangeable. In the present disclosure, Type 2 and Type II may be interpreted as interchangeable.

[0030] The uplink control information (UCI) type may include at least one of a hybrid automatic repeat reQuest ACKnowledgement (HARQ-ACK), a scheduling request (SR), and a CSI. The UCI may be carried by a PUCCH or a PUSCH.

[0031] In Rel.15 NR, UCI can contain one CSI part for wideband PMI feedback. CSI report #n contains PMI wideband information if reported.

[0032] In Rel.15 NR, UCI can include two CSI parts for subband PMI feedback. CSI part 1 includes wideband PMI information. CSI part 2 includes one wideband PMI information and some subband PMI information. CSI part 1 and CSI part 2 are coded separately.

[0033] In Rel.15 NR, a UE is configured by a higher layer with report settings of N (N≧1) CSI reporting configurations and resource settings of M (M≧1) CSI resource configurations. For example, as shown in FIG. 1, a CSI reporting configuration (CSI-ReportConfig) includes a resource setting for channel measurement (resourcesForChannelMeasurement), a CSI-IM resource setting for interference (csi-IM-ResourceForInterference), an NZP-CSI-RS setting for interference (nzp-CSI-RS-ResourceForInterference), a report quantity (reportQuantity), etc. 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 a CSI resource configuration (CSI-ResourceConfig, CSI-ResourceConfigId). The CSI resource configuration includes a list of CSI-RS resource sets (csi-RS-ResourceSetList, for example, an NZP-CSI-RS resource set or a CSI-IM resource set).

[0034] If interference measurements are performed in CSI-IM, each CSI-RS resource for channel measurements is associated with a CSI-IM resource on a resource-by-resource basis in the order of CSI-RS resources and CSI-IM resources in the corresponding resource set, and the number of CSI-RS resources for channel measurements is equal to the number of CSI-IM resources.

[0035] That is, for interference measurement based on CSI-IM, the channel measurement resource (CMR) and the interference measurement resource (IMR) have a one-to-one mapping.

[0036] If the UE is configured with a CSI reporting configuration with the report quantity (higher layer parameter reportQuantity) set to 'cri-RSRP', 'cri-RI-PMI-CQI', 'cri-RI-i1', 'cri-RI-i1-CQI', 'cri-RI-CQI', or 'cri-RI-LI-PMI-CQI', and K S (K S If k resources (k > 1) are configured, the UE derives CSI parameters other than CRI subject to the reported CRI. CSI k (k ≥ 0) corresponds to the configured (k+1)-th entry of the associated NZP-CSI-RS resource (nzp-CSI-RSResource) in the corresponding NZP-CSI-RS resource set (nzp-CSI-RS-ResourceSet) for channel measurements and the configured (k+1)-th entry of the associated CSI-IM resource (csi-IM-Resource) in the CSI-IM resource set (csi-IM-ResourceSet), if configured.

[0037] That is, CSI k corresponds to the set (k+1)th CMR and the set (k+1)th IMR.

[0038] For both FR1 and FR2, evaluation and provision of CSI reporting for DL ​​multi-TRP and / or multi-panel transmissions is under consideration to enable more dynamic channel / interference hypotheses for NCJT.

[0039] (Multi-TRP) In NR, one or more transmission / reception points (TRPs) (multi-TRPs) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs.

[0040] Note that multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0041] 2A-2D are diagrams illustrating an example of a multi-TRP scenario, assuming, but not limited to, that each TRP is capable of transmitting four different beams.

[0042] 2A shows an example of a case where only one TRP (TRP1 in this example) of the multiple TRPs transmits to the UE (may be called single mode, single TRP, etc.). In this case, TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.

[0043] 2B shows an example of a case where only one TRP (TRP1 in this example) of the multiple TRPs transmits a control signal to the UE, and the multiple TRPs transmit data signals (may be called a single master mode). The UE receives each PDSCH transmitted from the multiple TRPs based on one Downlink Control Information (DCI).

[0044] FIG. 2C shows an example of a case where each of the multiple TRPs transmits a part of the control signal to the UE and the multiple TRPs transmit data signals (which may be called a master-slave mode). Part 1 of the control signal (DCI) may be transmitted in TRP1, and part 2 of the control signal (DCI) may be transmitted in TRP2. Part 2 of the control signal may depend on part 1. The UE receives each PDSCH transmitted from the multiple TRP based on these parts of DCI.

[0045] 2D shows an example of a case where each of the multiple TRPs transmits a separate control signal to the UE, and the multiple TRPs transmit data signals (which may be called a multi-master mode). A first control signal (DCI) may be transmitted from TRP1, and a second control signal (DCI) may be transmitted from TRP2. The UE receives each PDSCH transmitted from the multiple TRPs based on these DCIs.

[0046] When multiple PDSCHs from multiple TRPs as shown in FIG. 2B (which may be called multiple PDSCHs) are scheduled using one DCI, the DCI may be called single DCI (S-DCI, single PDCCH). Also, when multiple PDSCHs from multiple TRPs as shown in FIG. 2D are scheduled using multiple DCIs, these multiple DCIs may be called multiple DCI (M-DCI, multiple PDCCHs).

[0047] Each TRP of the multi-TRP may transmit a different code word (CW) and a different layer. As one form of multi-TRP transmission, non-coherent joint transmission (NCJT) is being considered.

[0048] In the NCJT, for example, TRP1 performs modulation mapping and layer mapping on a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP2 performs modulation mapping and layer mapping on a second codeword to transmit a second PDSCH using a second number of layers (e.g., two layers) with a second precoding.

[0049] In addition, multiple PDSCHs (multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap with at least one of the time and frequency resources.

[0050] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0051] In URLLC for multiple TRPs, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multiple TRPs is supported. It is considered that repetition schemes (URLLC schemes, for example, schemes 1, 2a, 2b, 3, and 4) across multiple TRPs in the frequency domain, layer (spatial) domain, or time domain are supported. In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexed (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexed (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RVs may be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one slot. In scheme 4, multiple PDSCHs from multiple TRPs are transmitted in different slots.

[0052] Such a multi-TRP scenario allows for more flexible transmission control using channels with better quality.

[0053] NCJT with multiple TRPs / panels may use high rank. To support ideal and non-ideal backhaul between multiple TRPs, both single DCI (single PDCCH, e.g., FIG. 2B) and multi-DCI (single PDCCH, e.g., FIG. 2D) may be supported. For both single DCI and multi-DCI, the maximum number of TRPs may be 2.

[0054] For single PDCCH design (mainly for ideal backhaul), TCI extension is considered. Each TCI codepoint in DCI may correspond to TCI state 1 or 2. TCI field size may be the same as that of Rel.15.

[0055] For single PDCCH design (mainly for ideal backhaul), DMRS extensions are considered. UE may support the following combinations of layers from two TRPs, indicated by the antenna port field. For single codeword (CW) and single user (SU), the combination of the number of layers in TRP1 and TRP2 may be 1+1, 1+2, 2+1, or 2+2, indicated in the format of "number of layers in TRP1 + number of layers in TRP2". There is no agreement on supporting at least one combination of layers of 1+3 and 3+1 from two TRPs, support for multi-user (MU) case, and support for two CWs, indicated by the antenna port field. The size of the antenna port field may be the same as Rel. 15.

[0056] For multi-PDCCH design (for both ideal and non-ideal backhaul), the maximum number of CORESETs per PDCCH configuration information (PDCCH-Config) may be increased to 5 according to UE capability. The maximum number of CORESETs that can be configured with the same TRP may be up to the number reported by UE capability. The same TRP may have the same higher layer index (e.g., CORESET pool index) configured per PDCCH configuration information and per CORESET if configured. The UE capability may include at least three possible values.

[0057] For multi-PDCCH designs (for both ideal and non-ideal backhaul), the maximum number of BD and / or CCE resources per slot per serving cell may be increased depending on the UE capabilities.

[0058] For multi-TRP transmission, it is not clear how to measure and report CSI for different TRPs, since the CSI for different TRPs is usually different. For one TRP, the channel / interference assumptions vary depending on the transmission decisions (traffic) of neighboring TRPs. Therefore, it is not clear how to measure and report CSI for different interference hypotheses.

[0059] Therefore, the inventors conceived a method for measuring and reporting CSI for multiple panels / TRPs.

[0060] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0061] In the present disclosure, "A / B" and "at least one of A and B" may be read as interchangeable.

[0062] In the present disclosure, panel, Uplink (UL) transmitting entity, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a certain signal (e.g., DeModulation Reference Signal (DMRS) port), antenna port group of a certain signal (e.g., DMRS port group), group for multiplexing (e.g., Code Division Multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CW, redundancy version (RV), layer (MIMO layer, transmission layer, spatial layer), may be read as mutually interchangeable. Also, panel identifier (ID) and panel may be read as mutually interchangeable. In the present disclosure, TRP ID and TRP may be read as mutually interchangeable.

[0063] In the present disclosure, NCJT, NCJT using multi-TRP, multi-PDSCH using NCJT, multi-PDSCH, multiple PDSCH from multi-TRP, etc. may be read as interchangeable. Note that multi-PDSCH may mean multiple PDSCHs in which at least a part of time resources (e.g., one symbol) overlap, may mean multiple PDSCHs in which all time resources (e.g., all symbols) overlap, may mean multiple PDSCHs in which all time resources do not overlap, may mean multiple PDSCHs carrying the same TB or the same CW, or may mean multiple PDSCHs to which different UE beams (spatial domain receive filters, QCL parameters) are applied.

[0064] In the present disclosure, cell, CC, carrier, BWP, and band may be read as interchangeable.

[0065] In the present disclosure, the terms index, ID, indicator, and resource ID may be interchangeable.

[0066] (Wireless communication method) In the present disclosure, the TRP index, CORESET pool index (CORESETPoolIndex), pool index, group index, CSI reporting setting group index, CSI reporting group index, CSI reporting configuration index, CSI reporting setting group index, and resource setting group index may be read as interchangeable.

[0067] In the present disclosure, a channel measurement resource setting, a channel measurement resource, and resourcesForChannelMeasurement may be interchangeable. In the present disclosure, a CSI-IM resource setting for interference, a CSI-IM based interference measurement resource, csi-IM-ResourceForInterference, and an interference measurement resource may be interchangeable. In the present disclosure, a NZP-CSI-RS resource setting for interference, a NZP-CSI-RS based interference measurement resource, nzp-CSI-RS-ResourcesForInterference, and an interference measurement resource may be interchangeable.

[0068] <Embodiment 1> Separate configuration of CSI measurement and reporting for multiple TRPs may be supported. The base station may transmit separate configuration of CSI measurement and reporting for multiple TRPs. The base station may receive (obtain) a CSI report based on the separate configuration of CSI measurement and reporting for multiple TRPs.

[0069] Separate CSI reporting configurations (CSI-ReportConfig) for multiple TRPs may be configured. For example, as shown in FIG. 3, a UE may be configured with a CSI reporting configuration for TRP#1 and a CSI reporting configuration for TRP#2.

[0070] <<Embodiment 1-1>> The association between the CSI reporting configuration and the TRP may follow one of the following TRP Associations 1 and 2.

[0071] [TRP Association 1] The association between the CSI reporting configuration and the TRP may be transparent to the UE (may not be known to the UE, may not be visible to the UE).

[0072] [TRP Association 2] The association between the CSI reporting configuration and the TRP may be explicitly indicated to the UE.

[0073] The CSI reporting configuration and the TRP may be associated using at least one of the following association parameters 1 to 3.

[0074] [[Association Parameter 1]] A CSI reporting group index (CSI reporting setting group index) may be introduced. Each CSI reporting setting may be associated with a CSI reporting group index.

[0075] For example, as shown in FIG. 4, the CSI reporting configuration (CSI-ReportConfig) includes a CSI reporting group index (CSI reporting configuration group index, CSI-ReportConfigGroupId, CSI-ReportSettingGroupId), and may further include at least one of a CSI reporting configuration index (CSI-ReportConfigId), resource settings for channel measurement (resourcesForChannelMeasurement), CSI-IM resource settings for interference (csi-IM-ResourcesForInterference), and NZP-CSI-RS resource settings for interference (np-CSI-RS-ResourcesForInterference).

[0076] [[Association Parameter 2]] Each CSI reporting setting may be associated with a value of CORESETPoolIndex.

[0077] For example, as shown in FIG. 5, the CSI reporting configuration (CSI-ReportConfig) includes a CORESET pool index (CORESETPoolIndex), and may further include at least one of a CSI reporting configuration index (CSI-ReportConfigId), a resource setting for channel measurement (resourcesFroChannelMeasurement), a CSI-IM resource setting for interference (csi-IM-ResourcesForInterference), and an NZP-CSI-RS resource setting for interference (np-CSI-RS-ResourcesForInterference).

[0078] [[Association Parameter 3]] The PUCCH resource configured for the CSI reporting setting may be associated with a CORESET pool index value or a CSI reporting group index value.

[0079] For example, as shown in FIG. 6, a CSI reporting configuration (CSI-ReportConfig) may include a reporting configuration type (reportConfigType) and may further include a CSI reporting configuration index (CSI-ReportConfigId), and at least one of a resource setting for channel measurement (resourcesFroChannelMeasurement), a CSI-IM resource setting for interference (csi-IM-ResourcesForInterference), and a NZP-CSI-RS resource setting for interference (np-CSI-RS-ResourcesForInterference). The reporting configuration type may include information of periodic or semi-persistent on PUCCH (semiPersistentOnPUCCH). The information may include a periodicity and offset of CSI reporting (CSI-ReportPeriodicityAndOffset). The periodicity and offset of CSI reporting may include a PUCCH-CSI resource (PUCCH-CSI-Resource). The PUCCH-CSI resource may include a CORESET pool index (CORESETPoolIndex) or a CSI report group index (CSI-ReportConfigGroupId).

[0080] <<Embodiment 1-2>> For one TRP, at least one of the following interference premise associations 1 and 2 may be followed to reflect multiple different interference premise depending on the transmission decision of neighboring TRPs.

[0081] [Interference Premise Association 1] Separate CSI measurement and reporting configurations may be configured in the UE for a number of different interference hypotheses (hypotheses).

[0082] For example, as shown in FIG. 7, multiple CSI reporting configuration IDs are associated with multiple interference assumptions in one TRP, respectively.

[0083] For example, as shown in FIG. 8, for TRP#1, CSI report #1 corresponding to interference premise #1 is set, and CSI report #2 corresponding to interference premise #2 is set. Interference premise #1 includes channel measurement resource (CMR) #1 and interference measurement resource (IMR) #1. Interference premise #2 includes CMR #2 and IMR #2. For example, as shown in FIG. 9, for TRP#2, CSI report #3 corresponding to interference premise #3 is set, and CSI report #4 corresponding to interference premise #4 is set. Interference premise #3 includes CMR #3 and IMR #3. Interference premise #4 includes CMR #4 and IMR #4.

[0084] [Interference-presumed association 2] A joint configuration of CSI measurement and reporting for multiple different interference scenarios may be configured in the UE.

[0085] In the CSI reporting configuration for one TRP, multiple resource settings may be configured. Among the multiple resource settings, one resource setting may be for channel measurement. Among the multiple resource settings, multiple (M) resource settings may be for interference measurement based on CSI-IM.

[0086] In one resource setting, each CSI-RS resource for channel measurement may be associated with a CSI-IM resource on a resource-by-resource basis in the order of the CSI-RS resource in the resource set and the CSI-IM resource in the corresponding resource set.

[0087] If there are K S (K S >1) resources are configured, for each resource setting for interference measurement based on CSI-IM, the UE may derive CSI parameters other than CRI subject to the reported CRI. S (0≦k <K S ,0≦m <M,0≦l<L(M*K S)) may correspond to the configured (k+1)-th entry of the associated NZP-CSI-RS resource setting (nzp-CSI-RSResource) in the corresponding NZP-CSI-RS resource set information for channel measurements (nzp-CSI-RS-ResourceSet) and the (k+1)-th entry of the associated CSI-IM resource setting (csi-IM-Resource) in the corresponding CSI-IM resource set information (csi-IM-ResourceSet) of the (m+1)-th resource setting for CSI-IM based interference measurements, if configured.

[0088] For example, as shown in Figure 10A, a CSI report configuration (CSI-ReportConfig) includes one resource setting for channel measurement (resourcesForChannelMeasurement) and M CSI-IM resource settings for interference (csi-IM-ResourceForInterference). The M CSI-IM resource settings for interference correspond to multiple different interference assumptions.

[0089] For example, as shown in FIG. 10B, a CSI report configuration (CSI-ReportConfig) includes one resource setting for channel measurement (resourcesForChannelMeasurement) and M resource settings for interference. The M resource settings for interference correspond to a plurality of different interference assumptions. Each resource setting for interference is at least one of a CSI-IM resource setting for interference (csi-IM-ResourceForInterference) and an NZP-CSI-RS resource setting for interference (nzp-CSI-RS-ResourcesForInterference).

[0090] For one CSI report content, the CSI parameters may be mapped into the CSI report according to at least one of the following mapping methods 1 and 2.

[0091] [[Mapping method 1]] The mapping order of different CSI fields may be the same as in Rel. 15. Within the same CSI field (same type of CSI), multiple fields may be included, with each field corresponding to one interference assumption / resource setting.

[0092] 11 is a diagram illustrating an example of a CSI field in a CSI report #n. In the CSI report #n, for one CSI type, fields corresponding to the first CRI based on resource setting / interference assumption to the Lth CRI are consecutive.

[0093] [[Mapping method 2]] For a given interference assumption / resource setting, the mapping order of different CSI fields may be the same as in Rel. 15. Across different interference assumptions / resource settings, the mapping order of CSI may be in ascending or descending order of resource setting ID.

[0094] 12 is a diagram illustrating another example of CSI fields in a CSI report #n. In the CSI report #n, a plurality of CSI fields corresponding to a first CRI based on resource setting / interference assumption are mapped, followed by a plurality of CSI fields corresponding to a second CRI, and so on up to a plurality of CSI fields corresponding to an Lth CRI.

[0095] The resource setting for the interference measurement based on the NZP-CSI-RS may or may not be configured. If the resource setting is configured, the content of the first embodiment may be applied to the resource setting for the interference measurement based on the NZP-CSI-RS.

[0096] For example, as shown in FIG. 13, CSI report #1 corresponding to interference assumptions #1 and #2 is configured for TRP #1. Interference assumption #1 includes CMR #1 and IMR #1-1. Interference assumption #2 includes CMR #1 and IMR #1-2. For example, as shown in FIG. 14, CSI report #2 corresponding to interference assumptions #1 and #2 is configured for TRP #2. Interference assumption #1 includes CMR #2 and IMR #2-1. Interference assumption #2 includes CMR #2 and IMR #2-2.

[0097] According to the first embodiment, CSI reporting for multi-TRP can be appropriately configured.

[0098] <Embodiment 2> A joint configuration of CSI measurement and reporting for multiple TRPs may be supported. The base station may transmit a joint configuration of CSI measurement and reporting for multiple TRPs. The base station may receive (obtain) a CSI report based on the joint configuration of CSI measurement and reporting for multiple TRPs.

[0099] A joint CSI reporting configuration (CSI-ReportConfig) for multiple TRPs may be configured.

[0100] <<Embodiment 2-1>> In the CSI reporting configuration, multiple resource setting groups may be configured. Each resource setting group (RSG) may be associated with a TRP. For the resource setting group, at least one of a resource setting group index, a TRP index, and a CORESET pool index may be introduced.

[0101] The resource setting group index may be the same as the TRP index. Only two resource setting groups may be supported.

[0102] For example, as shown in Fig. 15, the CSI reporting configuration includes Y resource setting groups. Each resource setting group includes one resource setting for channel measurement and zero or more resource settings for interference measurement. The resource setting for interference measurement is a CSI-IM resource setting for interference or a NZP-CSI-RS resource setting for interference.

[0103] <<Embodiment 2-2>> For one TRP, in order to reflect multiple different interference assumptions depending on the transmission decisions of neighboring TRPs, one of the following interference assumption association rules 1 and 2 may be followed.

[0104] [Interference Premise Association 1] Separate CSI measurement and reporting settings may be configured in the UE for different interference scenarios.

[0105] In one resource setting group in a CSI reporting configuration, one or more resource settings may be configured. When two resource setting groups are configured, one or the first resource setting may be for channel measurement, and the other or the second resource setting may be for interference measurement based on CSI-IM.

[0106] The number of CSI-IM resources for interference measurement may be equal to the number of CSI-RS resources for channel measurement.

[0107] In one resource setting, each CSI-RS resource for channel measurement may be associated with a CSI-IM resource on a resource-by-resource basis in the order of the CSI-RS resource in the resource set and the CSI-IM resource in the corresponding resource set.

[0108] If there are K S (K SIn the case where k>1 (k > 1) resources are configured, for each resource setting for CSI-IM based interference measurement, the UE may derive CSI parameters other than CRI conditional on the reported CRI. CSI k (k ≥ 0) may correspond to the configured (k+1)-th entry of the associated NZP-CSI-RS resource setting (nzp-CSI-RSResource) in the corresponding NZP-CSI-RS resource set information (nzp-CSI-RS-ResourceSet) for channel measurement and the (k+1)-th entry of the associated CSI-IM resource setting (csi-IM-Resource) in the corresponding CSI-IM resource set information (csi-IM-ResourceSet) (if configured).

[0109] For example, as shown in FIG. 16, CSI reporting configurations #1 and #2 are associated with interference assumptions #1 and #2, respectively. Each CSI reporting configuration includes resource setting groups #1, #2, ..., #Y. One resource setting group may or may not include NZP-CSI-RS resource setting.

[0110] In one CSI report, CSI for multiple TRPs may be reported. The CSI report may comply with any of the following items 1 to 3.

[0111] [[Contents 1]] CSI parameters for multiple TRPs may be reported separately. For example, the UE may calculate CSI parameters for each TRP and report the CSI parameters for each TRP. The CSI parameters may include at least one of RI, PMI, and CQI.

[0112] The base station may recognize the resource setting group index for the CSI report according to one of the following resource setting group index determination methods 1 and 2.

[0113] [[[Resource setting group index determination method 1]]] The UE may explicitly report a resource setting group index corresponding to the resource setting group in the CSI report.

[0114] [[[Resource setting group index determination method 2]]] A resource setting group index corresponding to the resource setting group may be implicitly determined.

[0115] For the CSI report content, CSI for multiple different interference assumptions may be mapped into the CSI report according to at least one of the following mapping methods 1 and 2.

[0116] [[[[Mapping method 1]]]] The mapping order of different CSI fields may be the same as in Rel.15. Within the same CSI field (same type of CSI), multiple fields may be included, each corresponding to one resource setting group. The field corresponding to the lowest or highest resource setting group index may be mapped first (within the same CSI field, they may be mapped in ascending or descending order of resource setting group index).

[0117] 17 is a diagram showing an example of CSI fields in a CSI report #n. In a CSI report #n, for one CSI type, the fields corresponding to the first resource setting group through the Yth resource setting group are continuous.

[0118] [[[[Mapping method 2]]]] For a given resource setting group, the mapping order of different CSI fields may be the same as in Rel. 15. Across different resource setting groups, the mapping order of CSI may be in ascending or descending order of resource setting group index.

[0119] 18 is a diagram illustrating another example of CSI fields in a CSI report #n. In a CSI report #n, a plurality of CSI fields corresponding to a first resource setting group are mapped followed by a plurality of CSI fields corresponding to a second resource setting group, and so on up to a plurality of CSI fields corresponding to a Yth resource setting group.

[0120] [[Contents 2]] CSI parameters for multiple TRPs may be reported jointly. For example, the UE may calculate joint CSI parameters for multiple TRPs and report the joint CSI parameters for the multiple TRPs. One joint CSI parameter may be one value obtained from multiple values ​​corresponding to multiple TRPs respectively for one type of CSI. The UE may derive one value of the joint CSI parameter by encoding multiple values ​​for one type of CSI. One joint CSI parameter may correspond to one field. The CSI parameters may include at least one of RI, PMI, and CQI.

[0121] The number of CSI parameters may be determined according to either of the following methods 1 and 2 for determining the number of CSI parameters.

[0122] [[[CSI parameter number determination method 1]]] The number of reported joint CSI parameters may be specified in the specification. For example, in the y-th CSI report associated with Y resource setting groups, the number of reported CSI parameters is C Y y may be also possible.

[0123] [[[CSI parameter number determination method 2]]] The number of CSI parameters to be reported may be configured by the RRC.

[0124] [[Contents 3]] Whether CSI parameters for multiple TRPs are reported separately or jointly may be configured by RRC.

[0125] This setting may be done according to either of the following setting methods 1 or 2.

[0126] [[[Setting method 1]]] Whether CSI parameters for multiple TRPs are reported separately or jointly may be configured implicitly by RRC.

[0127] If the number of CSI reports is equal to the number of resource setting groups, separate CSI for the corresponding TRP is reported in one CSI report, otherwise joint CSI for multiple TRPs is reported.

[0128] [[[Setting method 2]]] Whether CSI parameters for multiple TRPs are reported separately or jointly may be explicitly configured by RRC.

[0129] For example, as shown in Figures 19 and 20, separate CSI measurements and reports are configured for different interference assumptions. For example, CSI report #1 for interference assumption #1 without interference between TRPs includes resource setting group #1 for TRP #1 and resource setting group #2 for TRP #2 as shown in Figure 19. Resources in resource setting groups #1 and #2 do not overlap with each other. For example, CSI report #2 for interference assumption #2 with interference from one TRP includes resource setting group #1 for TRP #1 and resource setting group #2 for TRP #2 as shown in Figure 20. The CMR of resource setting group #1 overlaps with the IMR of resource setting group #2, and the CMR of resource setting group #2 overlaps with the IMR of resource setting group #1.

[0130] [Interference-presumed association 2] A joint configuration of CSI measurement and reporting for multiple different interference scenarios may be configured in the UE.

[0131] In one resource setting group in one CSI reporting configuration, multiple resource settings may be configured. Among the multiple resource settings, one resource setting may be for channel measurement. Among the multiple resource settings, multiple (M) resource settings may be for interference measurement based on CSI-IM.

[0132] For each resource setting for interference measurement performed on CSI-IM, the number of CSI-IM resources for interference measurement may be equal to the number of CSI-RS resources for channel measurement.

[0133] In one resource setting, each CSI-RS resource for channel measurement may be associated with a CSI-IM resource on a resource-by-resource basis in the order of the CSI-RS resource in the resource set and the CSI-IM resource in the corresponding resource set.

[0134] If there are K S (K S If k+m*K resources are configured, for each resource setting for interference measurement based on CSI-IM, the UE may derive CSI parameters other than CRI subject to the reported CRI. S (0≦k <K S ,0≦m <M,0≦z<Z(M*K S )) may correspond to the configured (k+1)-th entry of the associated NZP-CSI-RS resource setting (nzp-CSI-RSResource) in the corresponding NZP-CSI-RS resource set information (nzp-CSI-RS-ResourceSet) for channel measurements and the (k+1)-th entry of the associated CSI-IM resource setting (csi-IM-Resource) in the corresponding CSI-IM resource set information (csi-IM-ResourceSet) of the (m+1)-th resource setting for CSI-IM based interference measurements (if configured).

[0135] Across different resource setting groups within one CSI reporting configuration, the number M of resource settings for CSI-IM based interference measurement may be the same.

[0136] Each resource setting for CSI-IM-based interference measurement in one resource setting group may be associated with a resource setting for CSI-IM-based interference measurement in another resource setting group on a resource setting basis.

[0137] If M (M>1) resource settings for CSI-IM-based interference measurement are configured in one resource setting group, the (m+1)th resource setting for CSI-IM-based interference measurement in one resource setting group may be associated with the (m+1)th resource setting in another resource setting group.

[0138] The resource setting for the interference measurement based on the NZP-CSI-RS may or may not be configured. If the resource setting is configured, the content of the second embodiment may be applied to the resource setting for the interference measurement based on the NZP-CSI-RS.

[0139] For example, as shown in FIG. 21, a CSI report configuration (CSI-ReportConfig) includes Y resource setting groups. One resource setting group includes one resource setting for channel measurement (resourcesForChannelMeasurement), M CSI-IM resource settings for interference (csi-IM-ResourceForInterference), and zero or more NZP-CSI-RS resource settings for interference (nzp-CSI-RS-ResourcesForInterference). One resource setting group may correspond to multiple TRPs, respectively. Multiple resource settings in one resource setting group may correspond to multiple interference assumptions, respectively.

[0140] In one CSI report, CSI for multiple TRPs and multiple interference conditions may be reported. The CSI report may comply with any of the following items 1 to 3.

[0141] [[Contents 1]] CSI parameters for multiple TRPs and multiple interference assumptions may be reported separately. For example, the UE may calculate CSI parameters for each TRP and each interference assumption, and report the CSI parameters for each TRP and each interference assumption. The CSI parameters may include at least one of RI, PMI, and CQI.

[0142] The base station may recognize the resource setting group index for the CSI report according to one of the following resource setting group index determination methods 1 and 2.

[0143] [[[Resource setting group index determination method 1]]] The UE may explicitly report a resource setting group index corresponding to the resource setting group in the CSI report.

[0144] [[[Resource setting group index determination method 2]]] A resource setting group index corresponding to the resource setting group may be implicitly determined.

[0145] For one CSI report content, the CSI parameters may be mapped into the CSI report according to at least one of the following mapping methods 1 to 6.

[0146] [[[[Mapping method 1]]]] The CSI parameters may be mapped to the CSI report in the following order: CSI parameter type (CSI field name), resource setting group (TRP) index, and resource setting (interference-based) index within one resource setting group.

[0147] [[[[Mapping method 2]]]] The CSI parameters may be mapped to the CSI report in the following order: type of CSI parameter (CSI field name), resource setting (interference-predicting) index within one resource setting group, and resource setting group (TRP) index.

[0148] [[[[Mapping method 3]]]] The CSI parameters may be mapped to a CSI report in the order of resource setting group (TRP) index, CSI parameter type (CSI field name), and resource setting (interference-based) index within one resource setting group.

[0149] [[[[Mapping Method 4]]]] The CSI parameters may be mapped to a CSI report in the order of a resource setting group (TRP) index, a resource setting (interference-based) index within one resource setting group, and a type of the CSI parameter (CSI field name).

[0150] [[[[Mapping Method 5]]]] The CSI parameters may be mapped to a CSI report in the order of a resource setting (interference-predicting) index within one resource setting group, a resource setting group (TRP) index, and a type of the CSI parameter (CSI field name).

[0151] [[[[Mapping Method 6]]]] The CSI parameters may be mapped to a CSI report in the order of a resource setting (interference-predicting) index within one resource setting group, a type of the CSI parameter (CSI field name), and a resource setting group (TRP) index.

[0152] [[Contents 2]] For one interference premise, CSI parameters for multiple TRPs may be jointly reported. For example, the UE may calculate joint CSI parameters for multiple TRPs for one interference premise and report the joint CSI parameters for the multiple TRPs. One joint CSI parameter may be one value obtained from multiple values ​​corresponding to multiple TRPs for one type of CSI for one interference premise. The UE may derive one value of the joint CSI parameter by encoding multiple values ​​for one type of CSI. One joint CSI parameter may correspond to one field. The CSI parameters may include at least one of RI, PMI, and CQI.

[0153] The number of CSI parameters may be determined according to either of the following methods 1 and 2 for determining the number of CSI parameters.

[0154] [[[CSI parameter number determination method 1]]] The number of reported joint CSI parameters may be specified in the specification. For example, in the y-th CSI report associated with Y resource setting groups, the number of reported CSI parameters is C Y y may be also possible.

[0155] [[[CSI parameter number determination method 2]]] The number of CSI parameters to be reported may be configured by the RRC.

[0156] [[Contents 3]] For one interference scenario, whether CSI parameters for multiple TRPs are reported separately or jointly may be configured by RRC.

[0157] This setting may be done according to either of the following setting methods 1 or 2.

[0158] [[[Setting method 1]]] For one interference scenario, whether CSI parameters for multiple TRPs are reported separately or jointly may be configured implicitly by RRC.

[0159] If the number of CSI reports is equal to the number of resource setting groups, separate CSI for the corresponding TRP is reported in one CSI report, otherwise joint CSI for multiple TRPs is reported.

[0160] [[[Setting method 2]]] For one interference scenario, whether CSI parameters for multiple TRPs are reported separately or jointly may be explicitly configured by RRC.

[0161] For example, as shown in FIG. 22 and FIG. 23, joint CSI measurement and reporting (CSI report #1) is configured for multiple interference assumptions and multiple TRPs. For example, CSI report #1 includes resource setting group #1 for TRP #1 and resource setting group #2 for TRP #2. Resource setting group #1 for TRP #1 includes resource setting for interference assumption #1 without interference between TRPs as shown in FIG. 22, and resource setting for interference assumption #2 with interference from one TRP as shown in FIG. 23. Resource setting group #2 for TRP #2 includes resource setting for interference assumption #1 without interference between TRPs as shown in FIG. 22, and resource setting for interference assumption #2 with interference from one TRP as shown in FIG. 23. In interference assumption #1, resources in resource setting groups #1 and #2 do not overlap each other. In interference premise #2, the CMR of resource setting group #1 overlaps with the IMR of resource setting group #2, and the CMR of resource setting group #2 overlaps with the IMR of resource setting group #1.

[0162] <Embodiment 3> Whether the separate CSI measurement / reporting configuration or the joint CSI measurement / reporting configuration is used for multiple TRPs may be determined according to either of the following decision methods 1 or 2.

[0163] [Decision method 1] One of separate CSI measurement / reporting and joint CSI measurement / reporting may be specified in the specification.

[0164] [Decision method 2] Separate CSI measurement / reporting or joint CSI measurement / reporting may be configured by RRC. If separate CSI measurement / reporting is configured, embodiment 1 may be applied. If joint CSI measurement / reporting is configured, embodiment 2 may be applied.

[0165] According to the third embodiment, one of separate CSI measurement / reporting and joint CSI measurement / reporting can be appropriately configured.

[0166] (Wireless communication system) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0167] 24 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0168] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0169] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN) and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN and the LTE (E-UTRA) base station (eNB) is the SN.

[0170] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0171] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0172] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0173] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0174] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0175] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0176] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0177] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0178] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0179] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0180] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0181] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0182] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0183] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0184] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0185] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0186] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0187] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0188] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0189] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0190] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0191] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0192] (base station) 25 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0193] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0194] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0195] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0196] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0197] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0198] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0199] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0200] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0201] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0202] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0203] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0204] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0205] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0206] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0207] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0208] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0209] The transceiver 120 may transmit multiple configurations (separation configurations, CSI reporting configurations) for measuring and reporting channel state information (CSI). The multiple configurations may correspond to two or more transmission and reception points. The control unit 110 may obtain at least one CSI report based on the multiple configurations (embodiment 1).

[0210] The transceiver 120 may transmit at least one configuration (joint configuration, CSI reporting configuration) for measuring and reporting channel state information (CSI) for multiple transmission and reception points. The control unit 110 may obtain a CSI report based on the configuration (embodiment 2).

[0211] (User terminal) 26 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230.

[0212] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0213] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0214] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0215] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0216] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0217] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0218] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0219] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0220] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0221] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0222] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0223] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0224] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0225] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0226] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0227] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220, the transmitting / receiving antenna 230, and the transmission path interface 240.

[0228] The transceiver 220 may receive multiple configurations (separation configuration, CSI reporting configuration) for measuring and reporting channel state information (CSI). The multiple configurations may correspond to two or more transmission and reception points. The control unit 210 may measure and report CSI based on the multiple configurations (embodiment 1).

[0229] Each of the multiple configurations may include an index (e.g., a CSI reporting group index, a CORESET pool index) associated with a corresponding transmission / reception point.

[0230] Two or more of the multiple configurations may correspond to one transmission / reception point. At least one resource for channel measurement and interference measurement may be different between the two or more configurations.

[0231] One of the multiple configurations may indicate multiple resources for interference measurement. The controller 210 may measure multiple CSIs based on the multiple resources, respectively, and report one CSI report including the multiple CSIs.

[0232] The transceiver 220 may receive at least one configuration (joint configuration, CSI reporting configuration) for measuring and reporting channel state information (CSI) for multiple transmission and reception points. The controller 210 may measure and report CSI based on the configuration (embodiment 2).

[0233] Each of the at least one configuration may include a plurality of groups (e.g., resource setting groups) of channel measurement resources and interference measurement resources, and each of the plurality of groups may include an index (e.g., a resource setting group index) associated with a transmission / reception point.

[0234] The at least one configuration may be a plurality of configurations, and at least one of a channel measurement resource and an interference measurement resource (e.g., resource setting, interference assumption) may be different among the plurality of configurations.

[0235] The at least one configuration may be one configuration. Each of the plurality of groups may include a plurality of combinations of resources for channel measurement and resources for interference measurement. At least one of the resources for channel measurement and the resources for interference measurement may be different among the plurality of combinations.

[0236] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0237] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0238] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 27 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0239] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0240] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0241] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0242] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0243] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0244] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0245] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0246] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0247] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0248] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0249] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0250] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0251] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0252] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate 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 process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0253] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0254] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0255] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0256] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0257] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0258] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0259] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0260] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0261] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0262] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0263] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0264] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0265] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0266] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0267] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0268] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0269] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0270] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0271] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0272] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0273] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0274] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0275] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0276] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0277] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0278] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0279] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0280] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0281] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0282] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0283] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0284] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0285] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0286] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0287] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0288] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0289] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0290] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0291] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0292] Each aspect / embodiment described in the present disclosure may be applied to a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 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), or other suitable wireless communication method, or a next-generation system extended based on these. In addition, multiple systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

[0293] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0294] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0295] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0296] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0297] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0298] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0299] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0300] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0301] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0302] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0303] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0304] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0305] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. A receiver that receives a configuration of multiple groups of resources for channel measurement associated with multiple transmission / reception points (TRPs) and a configuration that specifies a number of channel state information (CSI) parameters of different types associated with one or more groups among the multiple groups, the number being the number of each of the one or more CSI parameters to be reported to a base station; a control unit for controlling reporting of the one or more CSI parameters based on the configuration; The receiving unit receives the configuration in which the number of CSI parameters is two, and the control unit maps the one or more CSI parameters to each report in ascending order of a plurality of indexes respectively corresponding to the plurality of groups.

2. The terminal of claim 1 , wherein the multiple TRPs are used for non-coherent joint transmission.

3. 3. The terminal of claim 1, wherein when the configuration includes a first set of resources including the multiple groups and a second set of CSI-interference measurement (IM) resources, the one or more CSI parameters include a CSI-reference signal (RS) resource indicator k, the CSI-RS resource indicator k corresponding to a k+1-th resource in the first set and a k+1-th resource in the second set.

4. receiving a configuration of multiple groups of resources for channel measurement associated with multiple transmission / reception points (TRPs) and a configuration specifying a number of one or more channel state information (CSI) parameters of different types associated with one or more groups among the multiple groups, the number being a respective number of the one or more CSI parameters to be reported to a base station; and controlling reporting of the one or more CSI parameters based on the configuration. the receiving step receives the configuration in which the number of CSI parameters is two, and the controlling step maps the one or more CSI parameters to each report in ascending order of a plurality of indexes respectively corresponding to the plurality of groups.

5. A transmitter that transmits a configuration of multiple groups of resources for channel measurement associated with multiple transmission / reception points (TRPs), and a configuration specifying a number of channel state information (CSI) parameters of different types associated with one or more groups among the multiple groups, the number being the number of each of the one or more CSI parameters to be reported to a base station; a control unit for controlling reception of reports of the one or more CSI parameters based on the configuration; The base station is characterized in that the transmission unit transmits the configuration in which the number of CSI parameters is two, and the one or more CSI parameters are mapped to each report in ascending order of a plurality of indexes respectively corresponding to the plurality of groups.

6. A system having a terminal and a base station, The terminal includes: A receiver that receives a configuration of multiple groups of resources for channel measurement associated with multiple transmission / reception points (TRPs) and a configuration that specifies a number of channel state information (CSI) parameters of different types associated with one or more groups among the multiple groups, the number being the number of each of the one or more CSI parameters to be reported to a base station; a control unit for controlling reporting of the one or more CSI parameters based on the configuration; The receiving unit receives the configuration in which the number of CSI parameters is two, and the control unit maps the one or more CSI parameters to each report in ascending order of a plurality of indexes respectively corresponding to the plurality of groups; The base station transmits the configuration.

7. The terminal according to claim 1 , wherein the control unit determines, based on the setting and higher layer parameters, either a report for each of the multiple transmission / reception points or a single report for the multiple transmission / reception points.

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