Terminal, wireless communication method, base station, and system

Abstract

A terminal according to one embodiment of the present disclosure is characterized by including: a reception unit for receiving settings of a specific index indicating a serving cell and a non-serving cell, the specific index being created on the basis of physical cell ID, and different from the physical cell ID; and a control unit for controlling transmission of a channel state information report corresponding to the specific index that has been set. According to the one embodiment of the present disclosure, it is possible to appropriately transmit or receive a plurality of channels / signals from cells including the non-serving cell.

Description

Technical Field

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

Background Art

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

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

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In future wireless communication systems, layer 1 / layer 2 (L1 / L2) inter-cell mobility that facilitates more efficient DL / UL beam management (achieving lower latency and overhead) is being considered.

[0006] In L1 / L2 inter-cell mobility, it is possible to change the serving cell using functions such as beam control without resetting Radio Resource Control (RRC). In other words, it is possible to transmit and receive with a non-serving cell without handover. Since a data communication unavailable period occurs, such as the need for RRC reconnection for handover, L1 / L2 inter-cell mobility that does not require handover is preferable.

[0007] However, in at least one of inter-cell mobility including a non-serving cell and a multi-TRP scenario, the problem is how to control the transmission or reception of channels / signals transmitted from the same cell / TRP or different cells / TRPs. If the transmission and reception of channels / signals transmitted from the same cell / TRP or different cells / TRPs are not appropriately performed, there is a risk of throughput degradation or communication quality deterioration.

[0008] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately transmit or receive a plurality of channels / signals from a cell including a non-serving cell.

Means for Solving the Problems

[0009] A terminal according to an aspect of the present disclosure Object receives a setting of the specific index different from the physical cell ID, which indicates the serving cell when a specific value is set and indicates the non-serving cell when a value other than the specific value is set and receive the relationship between the physical cell ID and the specific index by upper layer signalingIt is characterized by having a receiving unit and a control unit that controls the transmission of channel state information (CSI) reports corresponding to the specific index.

Advantages of the Invention

[0010] According to one aspect of the present disclosure, it is possible to appropriately transmit or receive a plurality of channels / signals from a cell including a non-serving cell.

Brief Description of the Drawings

[0011]

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Modes for Carrying Out the Invention

[0012] (CSI Report) In NR, the UE measures the channel state using a predetermined reference signal (or the resource for the reference signal), and feeds back (reports) the channel state information (Channel State Information: CSI) to the base station.

[0013] The UE may measure the channel state using 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 resource may include at least one of Non Zero Power (NZP) CSI-RS and CSI-Interference Management (IM). The SS / PBCH block is a block that includes a synchronization signal (e.g., a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS)) and PBCH (and the corresponding DMRS), and may be called an SS block (SSB), etc. An SSB index may be given for the time position of the SSB within a half frame.

[0015] Note that CSI may include at least one of Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), CSI-RS Resource Indicator (CRI), SS / PBCH Block Indicator (SSBRI), Layer Indicator (LI), Rank Indicator (RI), Layer 1 (L1)-Reference Signal Received Power (RSRP) (reference signal received power in layer 1), L1-Reference Signal Received Quality (RSRQ), L1-Signal to Interference plus Noise Ratio (SINR), L1-Signal to Noise Ratio (SNR), etc.

[0016] CSI may have multiple parts. The first part of CSI (CSI part 1) may include information with relatively few bits (e.g., RI). The second part of CSI (CSI part 2) may include information with relatively many bits (e.g., CQI), such as information determined based on CSI part 1.

[0017] As CSI feedback methods, (1) Periodic CSI (P-CSI) reporting, (2) Aperiodic CSI (A(AP)-CSI) reporting, (3) Semi-Persistent CSI (SP-CSI) reporting, etc. are being considered.

[0018] The UE may notify information regarding CSI reports (which may also be referred to as CSI report configuration information) using upper layer signaling, physical layer signaling (e.g., Downlink Control Information (DCI)), or a combination thereof. The CSI report configuration information may be configured, for example, using the RRC information element "CSI-ReportConfig".

[0019] Here, the upper layer signaling may be, for example, any of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0020] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (MAC PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0021] The CSI report configuration information may include, for example, information regarding a reporting period, an offset, etc., and these may be expressed in a predetermined time unit (such as a slot unit, a subframe unit, a symbol unit, etc.). The CSI report configuration information may include a configuration ID (CSI-ReportConfigId). Parameters such as the type of CSI reporting method (whether it is SP-CSI or not), the reporting period, etc. may be specified by the said configuration ID. The CSI report configuration information may include information (CSI-ResourceConfigId) indicating which signal (or the resources for which signal) the CSI measured using is to be reported.

[0022] (Beam Management) So far, in Rel-15 NR, methods of beam management (BM) have been studied. In this beam management, beam selection is considered to be performed based on the L1-RSRP reported by the UE. Changing (switching) the beam of a certain signal / channel may correspond to changing the (Transmission Configuration Indication state) of the said signal / channel.

[0023] Note that the beam selected by beam selection may be a transmission beam (Tx beam) or a reception beam (Rx beam). Also, the beam selected by beam selection may be a beam of the UE or a beam of the base station.

[0024] The UE may report (transmit) the measurement results for beam management using PUCCH or PUSCH. The said measurement results may be CSI including at least one of, for example, L1-RSRP, L1-RSRQ, L1-SINR, L1-SNR, etc. Also, the said measurement results may be called beam measurement, beam measurement result, beam report, beam measurement report, etc.

[0025] CSI measurements for beam reporting may include interference measurements. The UE may measure channel quality, interference, etc. using resources for CSI measurement and derive a beam report. The resources for CSI measurement may be at least one of, for example, resources of SS / PBCH blocks, resources of CSI-RS, other reference signal resources, etc. The setting information of the CSI measurement report may be set for the UE using upper layer signaling.

[0026] The beam report may include the results of at least one of channel quality measurement and interference measurement. The results of channel quality measurement may include, for example, L1-RSRP. The results of interference measurement may include L1-SINR, L1-SNR, L1-RSRQ, and other interference-related indicators (for example, any indicator other than L1-RSRP).

[0027] Note that the resources for CSI measurement for beam management may be referred to as beam measurement resources. Also, the signal / channel to be measured for CSI may be referred to as a beam measurement signal. Also, CSI measurement / reporting may be read as at least one of measurement / reporting for beam management, beam measurement / reporting, radio link quality measurement / reporting, etc.

[0028] Regarding the CSI report setting information considering the current NR beam management, it is included in the RRC information element "CSI-ReportConfig". The information within the RRC information element "CSI-ReportConfig" will be described.

[0029] The CSI report setting information (CSI-ReportConfig) may include report quantity information (which may be represented by the RRC parameter "reportQuantity"), which is information on the parameters to be reported. The report quantity information is defined in the type of the ASN.1 object called "choice". Therefore, one of the parameters (such as cri-RSRP, ssb-Index-RSRP, etc.) defined as the report quantity information is set.

[0030] For a UE in which the upper layer parameter (for example, the RRC parameter "groupBasedBeamReporting") included in the CSI report setting information is set to be enabled, for each report setting, a plurality of beam measurement resource IDs (for example, SSBRI, CRI) and a plurality of measurement results corresponding thereto (for example, L1-RSRP) may be included in the beam report.

[0031] For a UE in which the number of reporting target RS resources is set by upper layer parameters (e.g., the RRC parameter "nrofReportedRS") included in CSI report setting information, for each report setting, one or more beam measurement resource IDs and one or more corresponding measurement results (e.g., L1-RSRP) may be included in the beam report.

[0032] (TCI, Spatial Relation, QCL) In NR, it is considered to control at least one of the reception processing (e.g., at least one of reception, demapping, demodulation, decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, encoding) in a UE for at least one of a signal and a channel (expressed as a signal / channel) based on a Transmission Configuration Indication state (TCI state).

[0033] The TCI state may represent what is applied to downlink signals / channels. What corresponds to the TCI state applied to uplink signals / channels may be expressed as a spatial relation.

[0034] The TCI state is information regarding the Quasi-Co-Location (QCL) of a signal / channel, and may be called a spatial reception parameter, Spatial Relation Information, etc. The TCI state may be set for a UE for each channel or each signal.

[0035] QCL is an indicator that shows the statistical properties of a signal / channel. For example, when a certain signal / channel and another signal / channel are in a QCL relationship, it may mean that at least one of Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same (QCL for at least one of these) among these multiple different signals / channels.

[0036] Note that the spatial Rx parameter may correspond to the receiving beam of the UE (e.g., receiving analog beam), and the beam may be specified based on spatial QCL. QCL (or at least one element of QCL) in this disclosure may be read as sQCL (spatial QCL).

[0037] Multiple types (QCL types) of QCL may be defined. For example, four QCL types A - D with different parameters (or parameter sets) that can be assumed to be the same may be provided, and the parameters (which may also be called QCL parameters) are shown as follows: · QCL type A (QCL - A): Doppler shift, Doppler spread, average delay, and delay spread, · QCL type B (QCL - B): Doppler shift and Doppler spread, · QCL type C (QCL - C): Doppler shift and average delay, · QCL type D (QCL - D): spatial Rx parameter.

[0038] The assumption that a given control resource set (Control Resource Set (CORESET)), channel, or reference signal is in a relationship of a specific QCL (e.g., QCL type D) with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0039] The UE may determine at least one of the transmission beam (Tx beam) and the reception beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0040] The TCI state may be, for example, information regarding the QCL between a target channel (in other words, a reference signal (Reference Signal (RS)) for the channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0041] In the present disclosure, the higher layer signaling may be, for example, any of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0042] The MAC signaling may use, for example, a MAC control element (MAC Control Element (MAC CE)), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0043] Physical layer signaling may be, for example, Downlink Control Information (DCI).

[0044] The channel for which the TCI state or spatial relation is set (specified) may be, for example, at least one of a Physical Downlink Shared Channel (PDSCH), a Physical Downlink Control Channel (PDCCH), a Physical Uplink Shared Channel (PUSCH), and a Physical Uplink Control Channel (PUCCH).

[0045] Also, the RS having a QCL relation with the channel may be, for example, at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), a Tracking Reference Signal (also called TRS), and a QCL Detection Reference Signal (also called QRS).

[0046] The SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). The SSB may be called an SS / PBCH block.

[0047] The information element of the TCI state (the "TCI-state IE" in RRC) configured by upper layer signaling may include one or more QCL information ("QCL-Info"). The QCL information may include at least one of information about the RS having a QCL relationship (RS relationship information) and information indicating the QCL type (QCL type information). The RS relationship information may include information such as the index of the RS (e.g., SSB index, Non-Zero-Power (NZP) CSI-RS resource ID (Identifier)), the index of the cell where the RS is located, and the index of the Bandwidth Part (BWP) where the RS is located.

[0048] In Rel.15 NR, as at least one TCI state of the PDCCH and PDSCH, both an RS of QCL type A and an RS of QCL type D, or only an RS of QCL type A can be configured for the UE.

[0049] When the TRS is configured as the RS of QCL type A, unlike the Demodulation Reference Signal (DMRS) for demodulating the PDCCH or PDSCH, it is assumed that the same TRS is transmitted periodically over a long period of time. The UE can measure the TRS and calculate the average delay, delay spread, etc.

[0050] For the UE in which the TRS is configured as the RS of QCL type A in the TCI state of the DMRS of the PDCCH or PDSCH, since it can be assumed that the parameters of QCL type A (average delay, delay spread, etc.) of the DMRS of the PDCCH or PDSCH and the TRS are the same, the parameters of type A (average delay, delay spread, etc.) of the DMRS of the PDCCH or PDSCH can be obtained from the measurement result of the TRS. When performing channel estimation for at least one of the PDCCH and PDSCH, the UE can use the measurement result of the TRS to perform more accurate channel estimation.

[0051] A UE configured with QCL-Type D RS can determine a UE receive beam (spatial domain receive filter, UE spatial domain receive filter) using the QCL-Type D RS.

[0052] The RS of QCL-Type X in a TCI state may mean the RS that is related to a certain channel / signal (its DMRS) and of QCL-Type X, and this RS may also be called the QCL source of QCL-Type X in the TCI state.

[0053] (Unified / Common TCI Framework) According to the unified TCI framework, UL and DL channels can be controlled by a common framework. Instead of defining TCI states or spatial relationships for each channel as in Rel.15, the unified TCI framework may indicate a common beam (common TCI state) and apply it to all UL and DL channels, or apply a common beam for UL to all UL channels and a common beam for DL to all DL channels.

[0054] One common beam for both DL and UL, or a common beam for DL and a common beam for UL (two common beams in total) are being considered.

[0055] The UE may assume the same TCI state (joint TCI state, joint TCI pool, joint common TCI pool) for UL and DL. The UE may also assume different TCI states (separate TCI state, separate TCI pool, UL separate TCI pool and DL separate TCI pool, separate common TCI pool, UL common TCI pool and DL common TCI pool) for UL and DL respectively.

[0056] Based on beam management using MAC CE (MAC CE level beam indication), the default beams for UL and DL may be aligned. The default TCI state of PDSCH may be updated to match the default UL beam (spatial relationship).

[0057] Based on DCI-based beam management (DCI level beam indication), a common beam / unified TCI state may be indicated from the same TCI pool (joint common TCI pool, joint TCI pool, set) for both UL and DL. M (>1) TCI states may be activated by MAC CE. The UL / DL DCI may select one from the M active TCI states. The selected TCI state may be applied to both UL and DL channels / RSs.

[0058] The TCI pool (set) may be a plurality of TCI states set by RRC parameters, or among the plurality of TCI states set by RRC parameters, a plurality of TCI states (active TCI states, active TCI pool, set) activated by MAC CE. Each TCI state may be a QCL type A / D RS. SSB, CSI-RS, or SRS may be set as the QCL type A / D RS.

[0059] In the example of Figure 1A, the RRC parameter (information element) sets a plurality of TCI states for both DL and UL. The MAC CE may activate a plurality of TCI states among the set plurality of TCI states. The DCI may indicate one of the activated plurality of TCI states. The DCI may be a UL / DL DCI. The indicated TCI state may be applied to at least one (or all) of the UL / DL channels / RSs. One DCI may indicate both UL TCI and DL TCI.

[0060] In the example of Figure 1A, one point may be one TCI state applied to both UL and DL, or two TCI states applied to UL and DL respectively.

[0061] At least one of a plurality of TCI states set by RRC parameters and a plurality of TCI states activated by MAC CE may be referred to as a TCI pool (common TCI pool, joint TCI pool, TCI state pool). The plurality of TCI states activated by MAC CE may be referred to as an active TCI pool (active common TCI pool).

[0062] In the present disclosure, a higher layer parameter (RRC parameter) that sets a plurality of TCI states may be simply referred to as setting information for setting a plurality of TCI states, simply "setting information". Also, in the present disclosure, being instructed to use DCI to indicate one of a plurality of TCI states may mean receiving instruction information for indicating one of a plurality of TCI states included in DCI, or simply receiving "instruction information".

[0063] In the example of FIG. 1B, the RRC parameter sets a plurality of TCI states (joint common TCI pool) for both DL and UL. The MAC CE may activate a plurality of TCI states (active TCI pool) among the set plurality of TCI states. Separate active TCI pools for each of UL and DL may be set / activated.

[0064] A DL DCI, or a new DCI format, may select (indicate) one or more (e.g., one) TCI states. The selected TCI state(s) may be applied to one or more (or all) DL channels / RSs. The DL channel may be a PDCCH / PDSCH / CSI-RS. The UE may determine the TCI state of each DL channel / RS using the Rel. 16 TCI state operation (TCI framework). A UL DCI, or a new DCI format, may select (indicate) one or more (e.g., one) TCI states. The selected TCI state(s) may be applied to one or more (or all) UL channels / RSs. The UL channel may be a PUSCH / SRS / PUCCH. Thus, different DCIs may separately indicate UL TCI and DL DCI.

[0065] The existing DCI format 1_2 / 1_2 may be used for indicating a common TCI state.

[0066] The common TCI framework may have separate TCI states for DL and UL.

[0067] The common TCI framework may have separate TCI states for DL and UL. It is not preferable to indicate a UL-only common TCI state using DCI format 1_1 / 1_2.

[0068] (Inter-cell mobility) By the way, in NR, it is being considered that one or more transmission / reception points (TRPs) (multi-TRP (MTRP)) perform DL transmission to the UE. Also, it is being considered that the UE performs UL transmission to one or more TRPs.

[0069] The UE may receive channels / signals from multiple cells / TRPs in inter-cell mobility (e.g., L1 / L2 inter cell mobility) (see FIGS. 2A and 2B).

[0070] Figure 2A shows an example of inter-cell mobility including a non-serving cell (e.g., inter-cell mobility of a single TRP). A single TRP may mean a case where only one of the multi-TRPs performs transmission to the UE (which may be called single mode). The CORESET pool index may indicate a single TRP. Here, it shows a case where the UE receives channels / signals from the base station / TRP of cell #1 that becomes the serving cell and the base station / TRP of cell #3 that is not the serving cell (non-serving cell). For example, it corresponds to the case where the UE switches from cell #1 to cell #3 (e.g., fast cell switch).

[0071] In this case, the TCI state is updated by DCI / MAC CE, and the selection of ports (e.g., antenna ports) / TRPs / points may be performed dynamically. Different physical cell IDs (e.g., PCI) are set for cell #1 and cell #3.

[0072] Figure 2B shows an example of a multi-TRP scenario (e.g., multi-TRP inter-cell mobility when using multi-TRPs). Here, it shows a case where the UE receives channels / signals from TRP#1 and TRP2. Here, it shows the case where TRP#1 exists in cell #1 (PCI#1) and TRP#2 exists in cell #2 (PCI#2).

[0073] Multi-TRP (TRP#1, #2) is connected by an ideal / non-ideal backhaul, and information, data, etc. may be exchanged. Different code words (Code Word (CW)) and different layers may be transmitted from each TRP of the multi-TRP. As a form of multi-TRP transmission, as shown in FIG. 1B, Non-Coherent Joint Transmission (NCJT) may be used. Here, the case where NCJT is performed between a plurality of cells (for example, cells with different PCI) is shown. Note that the same serving cell setting may be applied / set for TRP#1 and TRP#2.

[0074] In NCJT, for example, TRP#1 modulates and maps the first code word, layer-maps to the first number of layers (for example, 2 layers), and transmits the first signal / channel (for example, PDSCH) using the first precoding. Also, TRP#2 modulates and maps the second code word, layer-maps to the second number of layers (for example, 2 layers), and transmits the second signal / channel (for example, PDSCH) using the second precoding.

[0075] The plurality of PDSCHs (multi-PDSCH) subjected to NCJT may be defined to partially or completely overlap with respect to at least one of the time and frequency domains. That is, the first PDSCH from TRP#1 and the second PDSCH from TRP#2 may overlap in at least one of the time and frequency resources.

[0076] These first PDSCH and second PDSCH may be assumed to be not quasi-co-located. The reception of the multi-PDSCH may be reinterpreted as the simultaneous reception of PDSCH that is not of a certain QCL type (for example, QCL type D).

[0077] Multiple PDSCHs from multi-TRP (which may be referred to as multi-PDSCH (multiple PDSCH)) may be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single master mode). One DCI may be transmitted from one TRP of the multi-TRP. The configuration using one DCI in multi-TRP may be referred to as single DCI-based multi-TRP (mTRP / MTRP).

[0078] A case where each of the multi-TRP transmits a part of the control signal to the UE and the multi-TRP transmits a data signal (which may be referred to as master-slave mode) may be applicable.

[0079] Multiple PDSCHs from multi-TRP may be scheduled respectively using multiple DCIs (multi-DCI (M-DCI), multi-PDCCH (multiple PDCCH)) (multi-master mode). Multiple DCIs may be transmitted respectively from the multi-TRP. The configuration using multiple DCIs in multi-TRP may be referred to as multi-DCI-based multi-TRP (mTRP / MTRP).

[0080] The UE may be assumed to transmit separate CSI reports (CSI reports) for each TRP to different TRPs. Such CSI feedback may be referred to as separate feedback, separate CSI feedback, etc. In the present disclosure, "separate" may be read interchangeably with "independent".

[0081] For inter-cell mobility using multi-TRP, it has been considered to use the Rel.15 / 16 TCI state mechanism, and for inter-cell mobility using single-TRP, a new mechanism has been considered. In the Rel.15 / 16 TCI state mechanism, CSI-RS can be set as the TCI state of PDSCH / PDCCH (DMRS of PDSCH / PDCCH) (the TCI state of PDSCH / PDCCH refers to CSI-RS). Also, SSB can be set as the TCI state of CSI-RS. However, SSB cannot be directly set as the TCI state of PDSCH / PDCCH. In the new Rel.17 mechanism using a unified TCI state (inter-cell mobility of single-TRP), setting SSB (directly) as the TCI state of PDSCH / PDCCH is being considered.

[0082] Note that setting X as the TCI state of PDSCH / DCCH, the TCI state of PDSCH / PDCCH referring to X, and the QCL source of PDSCH / PDCCH being X may be mutually interchangeable.

[0083] In future wireless communication systems, the above-mentioned inter-cell mobility (L1 / L2 inter-cell mobility) that facilitates more efficient (achieving lower latency and overhead) DL / UL beam management is being considered.

[0084] In L1 / L2 inter-cell mobility, without RRC reconfiguration, service cell change is possible using functions such as beam control. In other words, transmission and reception with a non-serving cell are possible without handover. Since a data communication unavailable period occurs, such as the need for RRC reconnection for handover, L1 / L2 inter-cell mobility without handover is preferred.

[0085] However, in at least one of inter-cell mobility including non-serving cells and multi-TRP scenarios, there is a problem of how to control the transmission or reception of channels / signals transmitted from the same cell / TRP or different cells / TRPs. If the transmission and reception of channels / signals transmitted from the same cell / TRP or different cells / TRPs are not properly performed, there is a risk of throughput degradation or communication quality deterioration.

[0086] Therefore, the inventors have conceived a control for properly performing the transmission or reception of a plurality of channels / signals from a cell including a non-serving cell.

[0087] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to the respective embodiments may be applied individually or in combination.

[0088] In the present disclosure, CSI reports and beam reports may be read as each other. Reports and measurements may be read as each other.

[0089] In the present disclosure, a panel, an Uplink (UL) transmission entity, a point, a TRP, a spatial relationship, a Control Resource SET (CORESET), a PDSCH, a codeword, a base station, an antenna port of a certain signal (for example, a Demodulation Reference Signal (DMRS) port), an antenna port group of a certain signal (for example, a DMRS port group), a group for multiplexing (for example, a Code Division Multiplexing (CDM) group, a reference signal group, a CORESET group), a CORESET pool, a CORESET subset, a CW, a redundancy version (RV), a layer (MIMO layer, transmission layer, spatial layer), may be read as each other. Also, a panel Identifier (ID) and a panel may be read as each other. In the present disclosure, a TRP index, a TRP ID, a CORESET pool index, the ordinal numbers (first, second) of TCI states in two TCI states, a TRP, may be read as each other.

[0090] In the present disclosure, a TCI state, a common beam, a common TCI, a common TCI state, a unified TCI, a unified TCI state, a UL TCI, a DL TCI, a joint TCI state, a joint UL / DL TCI state, a TCI state applicable to DL and UL, a TCI state applied to multiple (multiple types) of channels / RSs, a TCI state applicable to multiple types of channels / RSs, a PL-RS, may be read as each other.

[0091] In the present disclosure, a TCI state, a plurality of TCI states set by RRC, a plurality of TCI states activated by MAC CE, a pool, a TCI state pool, an active TCI state pool, a common TCI state pool, a joint TCI state pool, a separate TCI state pool, a common TCI state pool for UL, a common TCI state pool for DL, a common TCI state pool set / activated by RRC / MAC CE, TCI state information, may be read as each other.

[0092] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, spatial domain reception filter, UE spatial domain reception filter, UE reception beam, DL beam, DL reception beam, DL precoding, DL precoder, DL-RS, RS of QCL type D for TCI state / QCL assumption, RS of QCL type A for TCI state / QCL assumption, spatial relationship, spatial domain transmission filter, UE spatial domain transmission filter, UE transmission beam, UL beam, UL transmission beam, UL precoding, UL precoder, PL-RS may be read interchangeably with each other. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, source of DL-RS, SSB, CSI-RS, SRS may be read interchangeably with each other.

[0093] In the present disclosure, single TRP, channel using single TRP, channel using one TCI state / spatial relationship, non-activation of multi-TRP by RRC / DCI, non-activation of multiple TCI states / spatial relationships by RRC / DCI, non-setting of one CORESET pool index (CORESETPoolIndex) value for any CORESET, and non-mapping of any code point of the TCI field to two TCI states may be read interchangeably with each other.

[0094] In the present disclosure, multi-TRP, channel using multi-TRP, channel using multiple TCI states / spatial relationships, activation of multi-TRP by RRC / DCI, activation of multiple TCI states / spatial relationships by RRC / DCI, at least one of multi-TRP based on single DCI and multi-TRP based on multi-DCI may be read interchangeably with each other.

[0095] In the present disclosure, cell, CC, carrier, BWP, and band may be read interchangeably with each other.

[0096] In the present disclosure, index, ID, indicator, and resource ID may be read interchangeably with each other.

[0097] In the present disclosure, "A / B" may be read as "at least one of A and B".

[0098] In the present disclosure, CSI report setting (CSI-ReportConfig) and CSI report setting may be read interchangeably with each other. CSI resource setting (CSI-ResourceConfig) and CSI resource setting may be read interchangeably with each other.

[0099] In the present disclosure, RS, beam, measurement result, and RS setting may be read interchangeably with each other. RS may mean at least one of CRI and SSBRI in CSI reporting. L1-RSRP and L1-SINR may be read interchangeably with each other. SSB, SSB index, and SSBRI may be read interchangeably with each other.

[0100] (Wireless communication method) The UE may receive a setting of a specific index (new ID described later) that is different from the physical cell ID and indicates a serving cell and a non-serving cell, which is created based on the physical cell ID (Physical Cell Identifier: PCI), and control the transmission of a channel state information report (CSI report) corresponding to the set specific index.

[0101] (CSI reporting based on the new ID) [1-bit indicator] A 1-bit indicator indicating a serving cell / non-serving cell may be applied. For example, "0" may indicate a serving cell and "1" may indicate a non-serving cell. Also, "1" may indicate a serving cell and "0" may indicate a non-serving cell.

[0102] [New ID] As information indicating a serving cell / non-serving cell, a new ID (for example, a recreated (re-indexed, re-numbered) index indicating a non-serving cell, a group ID of CMR), or a PCI (PCI used directly) may be applied. The new ID may be set only for serving cells and non-serving cells that the UE uses (is available for). That is, since the new ID is less than the total of the serving cell and non-serving cell, or less than the PCI, the number of bits can be reduced.

[0103] This new ID may depend on RS setting signaling (CSI report setting / CSI resource setting). This new ID may, for example, indicate that "0" is a serving cell, "1" is non-serving cell #1, and "2" is non-serving cell #2. That is, this new ID may indicate either a serving cell or one or more non-serving cells.

[0104] The recreated index indicating a non-serving cell may be associated with a part of the PCI. By using the recreated index instead of the PCI, the number of information bits can be reduced and the overhead of RRC signaling can be reduced. The recreated index may be called a recreated index.

[0105] When there is one non-serving cell, the new ID may be the same information as the above-described 1-bit indicator. That is, the new ID may mean the above-described 1-bit indicator. The parameter name of the new ID is not limited to "New ID", and any name may be used.

[0106] [CSI Report] When the UE receives the same (one) CSI report setting / CSI resource setting that includes both the settings of the RS (e.g., SSB) of the serving cell and the settings of the RS (e.g., SSB) of the non-serving cell, in addition to the conventional report content, it may control the transmission (report) of the CSI report including information indicating the serving cell / non-serving cell (corresponding to the information). The information is information indicating the association between the reference signal / measurement result and the serving cell or non-serving cell, and is, for example, the above-mentioned 1-bit indicator, new ID, etc. The report content may be, for example, at least one of the SSB index, CRI, L1-RSRP, L1-SINR, L1-SNR, LI, RI, PMI, CQI.

[0107] For example, the UE may use a new ID to set a plurality of non-serving cell settings with different RRC parameters and set L1 beam reports (CSI reports) for the plurality of non-serving cells. Then, one of the plurality of non-serving cells may be selected and the TCI state may be set.

[0108] Figure 3 is a diagram showing an example of a CSI report including information indicating a serving cell / non-serving cell. In Figure 3, the above-mentioned 1-bit indicator indicating the serving cell / non-serving cell or the new ID indicating the serving cell / non-serving cell is used. As shown in Figure 3, the "1-bit indicator" or "new ID" corresponds to "CRI or SSBRI #X" (X = 1 to N), respectively.

[0109] <The First Embodiment> When inter-cell mobility of a single transmit-receive point (single TRP) (see, e.g., FIG. 2A) or inter-cell mobility of multiple transmit-receive points (multi-TRP) (see, e.g., FIG. 2B) is applied, the UE may receive a TCI state corresponding to a cell index (PCI / serving cell index / new ID) and including the cell index (or may receive the TCI state together with the cell index). The TCI state may be a unified TCI state. The UE may determine that the TCI state is a TCI state corresponding to / associated with the cell index. The TCI state may be a TCI state having, as a QCL source, the received cell index or a cell index corresponding to / associated with the cell index. The UE may determine that the channel / signal is transmitted from a cell having a cell index corresponding to / associated with the cell index (the received cell index).

[0110] Hereinafter, inter-cell mobility of a single TRP (see, e.g., FIG. 2A) or inter-cell mobility of multi-TRP (see, e.g., FIG. 2B) may be simply referred to as inter-cell mobility. At least one of PCI, serving cell index / non-serving cell index, and new ID may be referred to as a cell index.

[0111] In single TRP / multi-TRP inter-cell mobility, the cell index may be transmitted in CSI-RS resources for channel measurement (resourcesForChannelMeasurement(CMR)) corresponding to CSI reports of L1-RSRP / SINR (or the cell index may be transmitted together with the CMR). The UE may determine that the L1-RSRP / SINR measured using the CMR corresponds to / relates to the cell index. The L1-RSRP / SINR may be the L1-RSRP / SINR having the cell index or a cell index corresponding to / related to the cell index as the QCL source. The UE may determine that the L1-RSRP / SINR is the L1-RSRP / SINR of a signal from a cell (other cell) having a cell index corresponding to / related to the cell index (received cell index).

[0112] <Second Embodiment> The bit size (number of bits) of the new ID may correspond to the number of non-serving cells (number of IDs of non-serving cells, number of PCIs) set by upper layer signaling or the like. For example, the number of bits N is determined by the following formula (1). Note that ceil(X) indicates the smallest integer greater than or equal to X. N = ceil(log2(non-serving cell number + 1))

[0113] The “+1” in the above formula (1) corresponds to the serving cell (own cell). For example, if the number of non-serving cells is 3, it can be indicated by 2 bits, showing the serving cell and three non-serving cells (non-serving cell #1, non-serving cell #2, non-serving cell #3).

[0114] The upper limit of the number of supportable cells may be defined in the specification (for example, 4 cells including the own cell). For example, this is to prevent an increase in UE impossibility due to the bit number of the new ID becoming too large or the number of cells for which the UE needs to perform L1 measurement increasing.

[0115] One way to support the configuration of the TCI state associated with a non-serving cell is to directly configure the PCI in the QCL / TCI state. However, directly configuring the PCI in the QCL / TCI state increases the RRC overhead. 10 bits of RRC signaling are used for one PCI. If there are 64 TCI state configurations from non-serving cells, it will cost 640 bits. Furthermore, when configuring the SSB of a non-serving cell in L1 beam measurement / reporting, 10 bits are used for each CMR of the non-serving cell's SSB, so the total overhead further increases.

[0116] On the other hand, a new ID can be recreated from the PCI, and instead, the QCL / TCI state / CMR can be used to configure the new ID. For the new ID, when there is only one non-serving cell, 1 bit of the new ID is sufficient to indicate the non-serving cell, and 2 bits of the new ID are sufficient to indicate up to three non-serving cells. By recreating the new ID based on the PCI, the signaling overhead can be significantly saved.

[0117] In the case of L1 / L2 centered inter-cell mobility, it is preferable to introduce a new ID (e.g., the recreated index of the non-serving cell ID) indicating the non-serving cell information associated with the TCI state / QCL information. The link between the PCI and the new ID may be configured by upper layer signaling. The bit size of the new ID may be determined by the number of non-serving cells supported by the cell (component carrier).

[0118] The UE may support the configuration of multiple non-serving cells in a CC. It may support configuring up to one non-serving cell from the recreated index so as to be associated with the TCI state / QCL configuration of the CC.

[0119] According to this embodiment, since an appropriate number of bits is set for the new ID, the overhead can be suppressed.

[0120] <Embodiment 3> [Aspect 3-1] The UE may receive (or may be set by upper layer signaling) the relationship between the serving cell / non-serving cell index or PCI and the new ID by upper layer signaling. For example, the relationship may be set by RRC and updated by MAC CE. By updating with MAC CE, cell switching can be enabled among many cells without reconfiguring RRC. If many non-serving cells are set in RRC from the beginning, RRC reconnection is not necessary (in an extreme case, 1007 non-serving cells are set), but the number of bits of the new ID increases, or the number of cells for which the UE needs to measure L1 beams increases, increasing the UE load.

[0121] The UE may measure the CMR of the serving cell index corresponding to the set serving cell / non-serving cell index or PCI and perform L1-RSRP / SINR beam reporting (CSI reporting). Also, the TCI state or unified TCI state of the serving cell index corresponding to the set non-serving cell index or PCI may be set.

[0122] FIG. 4 is a diagram showing a first example of the relationship between the serving cell / non-serving cell index or PCI and the new ID. For example, the relationship between the non-serving cell or PCI and the new ID, as in the example of FIG. 4, may be explicitly set by upper layer signaling or the like.

[0123] The relationship between the serving cell / non-serving cell index or PCI and the new ID may be defined (set) using a specific method (order). For example, the smaller the index (PCI) of the non-serving cell, the smaller new ID may be set (see, for example, FIG. 5). Or, the larger the index (PCI) of the non-serving cell, the smaller new ID may be set. The same new ID (for example, 0) may always be set for the serving cell.

[0124] FIG. 5 is a diagram showing a second example of the relationship between a serving cell / non-serving cell index or PCI and a new ID. In the example of FIG. 5, the smaller the PCI of the non-serving cell, the smaller the new ID is set. For example, when the PCIs of the non-serving cells are set to 124, 51, and 1005, the new ID = 1 is set for the non-serving cell with PCI = 51, the new ID = 2 is set for the non-serving cell with PCI = 124, and the new ID = 3 is set for the non-serving cell with PCI = 1005.

[0125] [Aspect 3-2] The UE may receive a MAC CE that activates (limits, selects, determines) at least one from among a plurality of serving cell / non-serving cell indexes or PCIs (candidates for serving cell / non-serving cell indexes or PCIs) received (set) by upper layer signaling (RRC). The activated serving cell / non-serving cell index or PCI (candidate) may correspond to a new ID.

[0126] Until activated by the MAC CE, the UE may assume no non-serving cells (operate in the case where no non-serving cells are set), or may determine and use a specific non-serving cell. For example, non-serving cells corresponding to new IDs = 1, 2, 3 may be assumed.

[0127] FIG. 6 is a diagram showing an example of a method for setting the relationship between a serving cell / non-serving cell index or PCI and a new ID. In the example shown in FIG. 6, the UE has a serving cell and non-serving cells #1 to #7 set by RRC, and a part of them is activated by MAC CE. In the example of FIG. 6, non-serving cell #1 (PCI = 124), non-serving cell #1 (PCI = 24), and non-serving cell #1 (PCI = 456) are activated. Note that the serving cell may also be activated by MAC CE, or the serving cell may always have a new ID set even if it is not activated by MAC CE.

[0128] In the example of FIG. 6, an example is shown in which new IDs corresponding to the PCI are set in the order set by RRC. Similar to Mode 3-2, the smaller the PCI of the non-serving cell, the smaller new ID may be set. For example, a new ID = 1 may be set for PCI = 24, a new ID = 2 may be set for PCI = 124, and a new ID = 3 may be set for PCI = 456.

[0129] According to the present embodiment, not limited to the number of PCIs, an appropriate number of new IDs are set / activated, so that overhead can be suppressed.

[0130] <UE capability> Each example of the present disclosure may be applied based on at least one of the fact that the corresponding UE capability (UE capability information) is reported (transmitted) or the setting of the corresponding upper layer signaling (RRC parameter) is performed. The UE capability may be, for example, any of the following (1) to (5), but is not limited to the following examples, and a UE capability indicating whether each example of the present disclosure is supported may be used.

[0131] (1) Whether the UE supports the function of single TRP or multi-TRP (L1 / L2 inter-cell mobility). (2) In the L1 / L2 inter-cell mobility, how many TCI states are there from non-serving cells for each CC (or for all CCs in total, or for all CCs in each band) that can be configured by RRC (or the total number of TCI states from both serving and non-serving cells). Note that the number of TCI states configured by RRC may be related to the UE's memory function. (3) In the L1 / L2 inter-cell mobility, how many TCI states are there from non-serving cells for each CC (or between all CCs, or for all CCs in each band) that can be activated by MAC CE (or the total number of TCI states from both serving and non-serving cells). Note that the number of TCI states activated by MAC CE may be related to the UE's processing capacity. (4) The number of non-serving cells (the number of different PCIs) that the UE can support in the L1 / L2 inter-cell mobility for each CC (or between all CCs, or between all CCs in each band). (5) Whether dynamic change of the DCI level of the serving cell is supported. If not supported, the UE can only support dynamic (slower than DCI) change at the MAC CE level of the serving cell.

[0132] (Wireless communication system) Hereinafter, the configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present disclosure.

[0133] FIG. 7 is a diagram showing an example of the 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) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0134] In addition, the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). 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.

[0135] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0136] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, NR-NR Dual Connectivity (NN-DC) where both the MN and the SN are base stations (gNBs) of NR).

[0137] The wireless communication system 1 may include a base station 11 that forms a relatively wide-coverage macro cell C1, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and the user terminal 20 are not limited to the modes shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0138] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).

[0139] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these. For example, FR1 may correspond to a frequency band higher than FR2.

[0140] Also, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0141] The plurality of base stations 10 may be connected by wire (e.g., an optical fiber compliant with Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between 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.

[0142] The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one of, for example, Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0143] The user terminal 20 may be a terminal corresponding to at least one of communication systems such as LTE, LTE-A, 5G, etc.

[0144] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access method 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.

[0145] The wireless access method may be referred to as a waveform. Note that in the wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0146] In the wireless communication system 1, as downlink channels, a Physical Downlink Shared Channel (PDSCH) shared by each user terminal 20, a Physical Broadcast Channel (PBCH), a Physical Downlink Control Channel (PDCCH), etc. may be used.

[0147] Also, in the wireless communication system 1, as uplink channels, a Physical Uplink Shared Channel (PUSCH) shared by each user terminal 20, a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), etc. may be used.

[0148] User data, upper layer control information, a System Information Block (SIB), etc. are transmitted by the PDSCH. User data, upper layer control information, etc. may be transmitted by the PUSCH. Also, a Master Information Block (MIB) may be transmitted by the PBCH.

[0149] 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.

[0150] Note that the DCI for scheduling the PDSCH may be called DL assignment, DL DCI, etc., and the DCI for scheduling the PUSCH may be called UL grant, UL DCI, etc. Note that the PDSCH may be read as DL data, and the PUSCH may be read as UL data.

[0151] For PDCCH detection, a control resource set (CORESET) and a search space may be used. A CORESET corresponds to the resource for searching for DCI. A search space corresponds to the search area and search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0152] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. in the present disclosure may be read interchangeably with each other.

[0153] Uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (for example, may be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) may be transmitted by PUCCH. A random access preamble for establishing a connection with the cell may be transmitted by PRACH.

[0154] Note that in the present disclosure, downlink, uplink, etc. may be expressed without "link". Also, "Physical" may be omitted from the beginning of various channels.

[0155] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may be transmitted.

[0156] The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, an SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.

[0157] Also, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may be transmitted. Note that DMRS may also be called a UE-specific reference signal.

[0158] (Base station) FIG. 8 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 transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may be provided.

[0159] In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0160] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, etc., which are described based on the common understanding in the technical field related to the present disclosure.

[0161] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission / reception, measurement, etc., using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data, control information, a sequence, etc. to be transmitted as a signal, and transfer it to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of a communication channel, state management of the base station 10, management of radio resources, etc.

[0162] The transmission / reception 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 transmission / reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common understanding in the technical field related to the present disclosure.

[0163] The transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122. The reception unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0164] The transmission / reception antenna 130 can be composed of an antenna described based on the common understanding in the technical field related to the present disclosure, such as an array antenna.

[0165] The transmission / reception unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 120 may receive the above-described uplink channel, uplink reference signal, etc.

[0166] The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0167] The transmission / reception unit 120 (transmission processing unit 1211) may perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0168] The transmission / reception unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0169] The transmission / reception unit 120 (RF unit 122) may perform modulation to the radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 130.

[0170] On the other hand, the transmission / reception unit 120 (RF unit 122) may perform amplification, filtering, demodulation to the baseband signal, etc. on the signal in the radio frequency band received by the transmission / reception antenna 130.

[0171] The transmission / reception unit 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 on the acquired baseband signal, and acquire user data, etc.

[0172] The transmission / reception unit 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)), reception 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.

[0173] The transmission path interface 140 may transmit and receive signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0174] Note that the transmission unit and reception unit of the base station 10 in the present disclosure may be configured by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0175] Note that the transmission / reception unit 120 may transmit a setting of a specific index that is created based on the physical cell ID and is different from the physical cell ID, indicating a serving cell and a non-serving cell. The transmission / reception unit 120 may receive a channel state information report corresponding to the set specific index.

[0176] The control unit 110 may control the reception of a channel state information report corresponding to the set specific index.

[0177] (User terminal) FIG. 9 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 transmission / reception unit 220, and a transmission / reception antenna 230. Note that one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided.

[0178] Note that in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0179] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0180] 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.

[0181] The transmission / reception 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 transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0182] The transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit may be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0183] The transmission / reception antenna 230 can be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna and the like.

[0184] The transmission / reception unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 220 may transmit the above-described uplink channel, uplink reference signal, etc.

[0185] The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0186] The transmission / reception unit 220 (transmission processing unit 2211) may perform processing of the PDCP layer, processing of the RLC layer (e.g., RLC retransmission control), processing of the MAC layer (e.g., HARQ retransmission control), etc. on, for example, data, control information, etc. acquired from the control unit 210, and generate a bit string to be transmitted.

[0187] The transmission / reception unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0188] Whether to apply DFT processing may be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is enabled, the transmission / reception unit 220 (transmission processing unit 2211) may perform DFT processing as the above-described transmission processing to transmit the channel using the DFT-s-OFDM waveform, or otherwise, it may not perform DFT processing as the above-described transmission processing.

[0189] The transmitting and receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230.

[0190] On the other hand, the transmitting and receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230.

[0191] The transmitting and receiving unit 220 (receiving processing unit 2212) may apply receiving processing such as analog-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.

[0192] The transmitting and receiving unit 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.

[0193] Note that the transmitting and receiving parts of the user terminal 20 in the present disclosure may be constituted by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230.

[0194] Note that the transmitting and receiving unit 220 may receive a setting of a specific index indicating a serving cell and a non-serving cell, which is different from the physical cell ID and is created based on the physical cell ID.

[0195] The transmitting and receiving unit 220 may receive a Transmission Configuration Indicator (TCI) state corresponding to the specific index when single-transmitting and receiving point or inter-cell mobility of a plurality of transmitting and receiving points is applied.

[0196] The transmitting and receiving unit 220 may receive the relationship between the serving cell index, the non-serving cell index, or the physical cell ID and the specific index by upper layer signaling.

[0197] The transmitting and receiving unit 220 may receive candidates for the serving cell index, the non-serving cell index, or the physical cell ID by upper layer signaling, and receive a Medium Access Control Control Element (MAC CE) that activates at least one of the candidates. The activated candidate may correspond to the specific index.

[0198] The control unit 210 may control the transmission of channel state information reports corresponding to the set specific index.

[0199] (Hardware Configuration) Note that the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0200] Here, functions include, but are not limited to, judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, etc. For example, a functional block (component) that enables transmission may be referred to as a transmitting unit, a transmitter, etc. In any case, as described above, the implementation method is not particularly limited.

[0201] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 10 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may physically be 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.

[0202] Note that in the present disclosure, terms such as device, circuit, device, section, unit, etc. can be read interchangeably with each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0203] For example, although only one processor 1001 is shown in the figure, there may be a plurality of processors. Also, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

[0204] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a predetermined software (program) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via a communication device 1004, or control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0205] The processor 1001 controls the entire computer by operating, for example, an operating system. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, at least a part of the above-described control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0206] Also, the processor 1001 reads a program (program code), software module, 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 these. As the program, a program for causing a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and the same may apply to other functional blocks.

[0207] The memory 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), a software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0208] The storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other suitable storage media. The storage 1003 may be referred to as an auxiliary storage device.

[0209] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-described transceiver unit 120 (220), the transceiver antenna 130 (230), etc. may be implemented by the communication device 1004. The transceiver unit 120 (220) may be physically or logically separated into a transmitter unit 120a (220a) and a receiver unit 120b (220b).

[0210] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

[0211] Also, 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 for each device.

[0212] In addition, 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), and a Field Programmable Gate Array (FPGA), 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 hardware components.

[0213] (Modification example) Regarding the terms described in the present disclosure and the terms necessary for understanding the present disclosure, they may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be read interchangeably with each other. Also, a signal may be a message. A reference signal may also be abbreviated as RS and may be called a Pilot, a pilot signal, etc. depending on the applicable standard. Also, a Component Carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, etc.

[0214] 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 the radio frame may be called a subframe. Further, 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 does not depend on numerology.

[0215] Here, the new numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The new numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering process performed by a transceiver in the frequency domain, specific windowing process performed by a transceiver in the time domain, etc.

[0216] A slot may be composed of one or more symbols (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Also, a slot may be a time unit based on the new numerology.

[0217] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0218] A radio frame, sub-frame, slot, mini-slot, and symbol all represent time units for signal transmission. Different names may be used for the radio frame, sub-frame, slot, mini-slot, and symbol respectively. Note that the time units such as frame, sub-frame, slot, mini-slot, and symbol in this disclosure may be read interchangeably with each other.

[0219] For example, one sub-frame may be called a TTI, or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be the sub-frame (1 ms) in the existing LTE, or may be a period shorter than 1 ms (for example, 1 - 13 symbols), or may be a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc. instead of a sub-frame.

[0220] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. Note that the definition of the TTI is not limited to this.

[0221] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), code block, codeword, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when the TTI is given, the time interval (for example, the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0222] When one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0223] 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 TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0224] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of a long TTI and equal to or more than 1 ms.

[0225] A resource block (Resource Block (RB)) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. 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.

[0226] Also, an RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be constituted by one or a plurality of resource blocks.

[0227] Note that one or more RBs may be referred to as a Physical Resource Block (PRB), a Sub-Carrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, etc.

[0228] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 sub-carrier and 1 symbol.

[0229] A Bandwidth Part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. A PRB is defined in a certain BWP and may be numbered within the BWP.

[0230] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be set within one carrier.

[0231] At least one of the set BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0232] Note that the structures such as the wireless frame, subframe, slot, mini-slot, and symbol described above are merely examples. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0233] Also, the information, parameters, etc. described in this disclosure may be represented using absolute values, relative values from a predetermined value, or using corresponding other information. For example, a wireless resource may be indicated by a predetermined index.

[0234] The names used for parameters, etc. in this disclosure are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in this disclosure. Since various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting names in any way.

[0235] The information, signals, etc. described in this disclosure may be represented using any of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0236] Also, information, signals, etc. can be output at least one of from the upper layer to the lower layer and from the lower layer to the upper layer. Information, signals, etc. may be input and output via a plurality of network nodes.

[0237] The input / output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. The information, signals, etc. to be input / output may be overwritten, updated, or appended. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

[0238] The notification of information is not limited to the modes / 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 implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0239] Note that the physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Also, the RRC signaling may be referred to as an RRC message and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. Further, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0240] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to an explicit notification and may be performed implicitly (e.g., by not performing the notification of the predetermined information or by the notification of another piece of information).

[0241] The determination may be made based on a value represented by 1 bit (either 0 or 1), or by a boolean value represented by true or false, or by a numerical comparison (e.g., comparison with a predetermined value).

[0242] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0243] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0244] The terms "system" and "network" used in this disclosure may be used interchangeably. "Network" may mean the devices (e.g., base stations) included in the network.

[0245] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. may be used interchangeably.

[0246] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. The base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0247] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each of the smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base station and the base station subsystem that provides communication services in this coverage.

[0248] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0249] A mobile station may also be called a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terms.

[0250] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or unmanned). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0251] In addition, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between the base station and the user terminal is replaced with communication between a plurality of user terminals (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured to be functions of the user terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to communication between terminals (for example, "sidelink"). For example, an uplink channel, a downlink channel, etc. may be replaced with a sidelink channel.

[0252] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal 20 may be configured to be functions of the base station 10.

[0253] In the present disclosure, operations assumed to be performed by the base station may in some cases be performed by its upper node. In a network including one or more network nodes having a base station, it is obvious that various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME), Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

[0254] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0255] Each aspect / embodiment described in the present disclosure may be applicable to systems using Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, the 4th generation mobile communication system (4G), the 5th generation mobile communication system (5G), the 6th generation mobile communication system (6G), the xth generation mobile communication system (xG) (where x is, for example, an integer or a decimal), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable wireless communication methods, and next-generation systems extended based on these. Further, multiple systems may be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

[0256] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0257] As used herein, the term "determining" may encompass a wide variety of operations. For example, "determining" may be considered to be "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up, searching, inquiring" (e.g., searching in a table, database or another data structure), "ascertaining", etc.

[0258] Also, "determining" may be considered to be "receiving" (e.g., receiving information), "transmitting" (e.g., transmitting information), "input", "output", "accessing" (e.g., accessing data in a memory), etc.

[0259] Also, "determining" may be considered to be "resolving", "selecting", "choosing", "establishing", "comparing", etc. That is, "determining" may be considered to be "determining" some operation.

[0260] Also, "determining" may be read as "assuming", "expecting", "considering", etc.

[0261] As used in this disclosure, the terms "connected" and "coupled," or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed."

[0262] In this disclosure, when two elements are connected, they can be considered to be "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, light (both visible and invisible) region, etc.

[0263] In this disclosure, the term "A and B are different" may mean that "A and B are different from each other." Note that the term may also mean that "A and B are each different from C." Terms such as "separate," "coupled," etc. may also be interpreted in the same way as "different."

[0264] In this disclosure, when the terms "include," "including," and their variations are used, these terms are intended to be inclusive, in the same way as the term "comprising." Further, the term "or" used in this disclosure is not intended to be an exclusive disjunction.

[0265] In this disclosure, for example, when articles are added by translation, such as a, an, and the in English, this disclosure may include that the nouns following these articles are in the plural form.

[0266] Although the invention according to the present disclosure has been described in detail above, it is obvious 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 changed aspects without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and does not bring any restrictive meaning to the invention according to the present disclosure.

Claims

1. A specific index different from the physical cell ID, which indicates a serving cell when a specific value is set and indicates a non-serving cell when a value other than the specific value is set, receives a setting of the specific index, and a receiving unit that receives the relationship between the physical cell ID and the specific index by upper layer signaling; A control unit that controls transmission of channel state information (CSI) reports corresponding to the specific index; A terminal having the above.

2. When cell mobility among a plurality of transmission / reception points is applied, the receiving unit receives a transmission configuration indication (TCI) state of Downlink (DL) or Uplink (UL) corresponding to the specific index. The terminal according to Claim 1.

3. The receiving unit receives indexes of a plurality of non-serving cells by Radio Resource Control (RRC) signaling, and receives a Medium Access Control Control Element (MAC CE) that activates at least one of the plurality of non-serving cells. The activated non-serving cell corresponds to the specific index. The terminal according to Claim 1.

4. The control unit measures Resources for Channel Measurement (CMR) corresponding to the non-serving cell and controls transmission of the CSI report including Layer 1 (L1)-Reference Signal Received Power (RSRP). The terminal according to Claim 1.

5. The terminal further includes a transmitting unit that transmits, as capability information, the number of non-serving cells for each Component Carrier (CC) supported by the terminal. The terminal according to Claim 1.

6. A step of receiving a setting of a specific index different from the physical cell ID, which indicates a serving cell when a specific value is set and indicates a non-serving cell when a value other than the specific value is set, and receiving the relationship between the physical cell ID and the specific index by upper layer signaling; A step of controlling transmission of channel state information (CSI) reports corresponding to the specific index; A wireless communication method for a terminal having the above.

7. A transmitting unit that transmits a setting of a specific index different from the physical cell ID, which indicates a serving cell when a specific value is set and indicates a non-serving cell when a value other than the specific value is set, and transmits the relationship between the physical cell ID and the specific index by upper layer signaling. A control unit that controls reception of a channel state information (CSI) report corresponding to the set specific index. A base station having the above.

8. A system including a terminal and a base station, wherein the terminal has a receiving unit that receives a setting of a specific index different from the physical cell ID, which indicates a serving cell when a specific value is set and indicates a non-serving cell when a value other than the specific value is set, and receives the relationship between the physical cell ID and the specific index by upper layer signaling, and a control unit that controls transmission of a channel state information (CSI) report corresponding to the specific index, and the base station has a control unit that controls reception of the CSI report system.

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