Terminal, wireless communication method, base station and system

Abstract

A terminal according to as aspect of the present disclosure is characterized by comprising: a reception unit that, in a case of performing communication with a transmission / reception point, receives, via an upper layer signaling, configurations of a plurality of candidate serving cells that are non-serving cells; and a control unit that, in a case of having received an instruction that indicates any one of the plurality of candidate serving cells, changes the serving cell to the candidate serving cell indicated by the instruction. According to an aspect of the present disclosure, a high speed intercell mobility can be achieved.

Description

[Technical field]

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

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

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

[0004] In existing LTE systems (e.g., 3GPP Rel. 8-14), a user equipment (User Equipment (UE)) transmits uplink control information (Uplink Control Information (UCI)) using at least one of an UL data channel (e.g., a Physical Uplink Shared Channel (PUSCH)) and an UL control channel (e.g., a Physical Uplink Control Channel (PUCCH)). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0006] In previous NR specifications, inter-cell mobility when a single transmitting / receiving point (single TRP) is applied was not sufficiently considered.

[0007] Since multi-TRP follows single-TRP (cell) framework, many settings (e.g. PDCCH / PDSCH settings) are the same (common) among multiple TRPs even if the multiple TRPs have different PCIs. However, the settings of the source serving cell and the target serving cell are different in many ways. Therefore, it is difficult to realize high-speed inter-cell mobility without appropriate configuration change of the serving cell.

[0008] Therefore, an object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can realize high-speed inter-cell mobility. [Means for solving the problem]

[0009] A terminal according to one embodiment of the present disclosure includes: Radio Resource Control (RRC) Signaling allows multiple candidates that are non-serving cells to be Complementary Receive the settings and receiving information regarding a Transmission Configuration Indication (TCI) state of any one of the plurality of candidate cells by a Medium Access Control Element (MAC CE). A receiving unit; to the candidate cell corresponding to the TCI state, Change serving cell and apply the TCI state and a control unit. Effect of the Invention

[0010] According to one aspect of the present disclosure, high-speed inter-cell mobility can be achieved. [Brief description of the drawings]

[0011] [Figure 1] 1A-1D are diagrams illustrating an example of a multi-TRP scenario. [Diagram 2] 2A and 2B are diagrams showing an example of an intra-cell TRP and an example of an inter-TRP, respectively. [Diagram 3] FIG. 3 is a diagram showing a first setting example of the RRC. [Figure 4] FIG. 4 is a diagram showing a second setting example of the RRC. [Diagram 5] FIG. 5 is a diagram showing a third example of the RRC setting. [Figure 6] FIG. 6 is a diagram showing a fourth example of the RRC setting. [Figure 7] FIG. 7 is a diagram showing a fifth example of the RRC setting. [Figure 8] FIG. 8 is a diagram showing an example of application of a single TRP. [Figure 9] FIG. 9 is a diagram showing an example of multiple TRPs with different TCI states set. [Figure 10] Fig. 10A is a diagram showing an example in which the same serving cell is set for multiple TRPs, Fig. 10B is a diagram showing an example of a conventional Layer 3 (L3) handover, and Fig. 10C is a diagram showing an example of a DAPO handover. [Figure 11] FIG. 11 is a diagram illustrating an example of a serving cell configuration according to the second embodiment. [Figure 12] FIG. 12 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 13] FIG. 13 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 15]FIG. 15 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] (TCI, spatial relations, QCL) In NR, it is considered to control reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a UE of at least one of a signal and a channel (referred to as a signal / channel) based on a transmission configuration indication state (TCI state).

[0013] The TCI state may represent that which is applied to a downlink signal / channel. The equivalent of the TCI state which is applied to an uplink signal / channel may be expressed as a spatial relation.

[0014] The TCI state is information on the Quasi-Co-Location (QCL) of signals / channels, and may be called spatial reception parameters, spatial relation information, etc. The TCI state may be configured in the UE for each channel or for each signal.

[0015] A QCL is an index that indicates the statistical properties of a signal / channel. For example, when a signal / channel and another signal / channel are in a QCL relationship, it may mean that it can be assumed that at least one of the following is the same (QCL with respect to at least one of the following) between these different signals / channels: Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter).

[0016] In addition, the spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be specified based on a spatial QCL. A QCL (or at least one element of a QCL) in the present disclosure may be replaced with a spatial QCL (sQCL).

[0017] A plurality of types (QCL types) of QCL may be defined. For example, four QCL types AD may be provided, each having different parameters (or parameter sets) that can be assumed to be the same. The parameters (which may be called QCL parameters) are as follows: QCL Type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread, QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and mean delay, · QCL type D (QCL-D): spatial reception parameters.

[0018] The UE's assumption that a given Control Resource Set (CORESET), channel, or reference signal is in a particular QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0019] The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on the TCI condition or QCL assumptions of the signal / channel.

[0020] The TCI state may be, for example, information about the QCL of the channel of interest (in other words, the Reference Signal (RS) for that 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 of these.

[0021] In the present disclosure, higher layer signaling may be, for example, any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like.

[0022] The MAC signaling may be, for example, a 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.

[0023] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0024] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0025] In addition, the RS that has a QCL relationship 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 CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).

[0026] An 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). An SSB may be referred to as an SS / PBCH block.

[0027] An information element of the TCI state ("TCI-state IE" of RRC) set by higher layer signaling may include one or more pieces of QCL information ("QCL-Info"). The QCL information may include at least one of information on an RS having a QCL relationship (RS relationship information) and information indicating a QCL type (QCL type information). The RS relationship information may include information such as an index of the RS (e.g., an SSB index, a Non-Zero-Power (NZP) CSI-RS resource identifier), an index of a cell in which the RS is located, an index of a Bandwidth Part (BWP) in which the RS is located, etc.

[0028] In Rel.15 NR, both the QCL type A RS and the QCL type D RS, or only the QCL type A RS, can be configured for a UE as at least one TCI state of the PDCCH and the PDSCH.

[0029] When the TRS is configured as the RS of QCL type A, unlike the demodulation reference signal (DMRS) of the PDCCH or PDSCH, the same TRS is expected to be transmitted periodically over a long period of time. The UE can measure the TRS and calculate the average delay, delay spread, etc.

[0030] A UE in which the TRS is set as a QCL type A RS in the TCI state of the DMRS of PDCCH or PDSCH can assume that the parameters of the QCL type A of the DMRS of PDCCH or PDSCH and the parameters of the QCL type A of the TRS (average delay, delay spread, etc.) are the same, and can therefore obtain the parameters of the DMRS of PDCCH or PDSCH type A (average delay, delay spread, etc.) from the measurement result of the TRS. When performing channel estimation of at least one of the PDCCH and the PDSCH, the UE can perform more accurate channel estimation by using the measurement result of the TRS.

[0031] A UE configured with a 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.

[0032] An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel / signal (its DMRS), and this RS may be called a QCL source of QCL type X in the TCI state.

[0033] (Multi-TRP) In NR, one or more transmission / reception points (TRPs) (multi-TRPs) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs.

[0034] Note that multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0035] 1A-1D are diagrams illustrating an example of a multi-TRP scenario, assuming, but not limited to, that each TRP is capable of transmitting four different beams.

[0036] 1A shows an example of a case where only one TRP (TRP1 in this example) of the multiple TRPs transmits to the UE (may be called single mode, single TRP, etc.). In this case, TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.

[0037] 1B shows an example of a case where only one TRP (TRP1 in this example) of the multiple TRPs transmits a control signal to the UE, and the multiple TRPs transmit data signals (may be called a single master mode). The UE receives each PDSCH transmitted from the multiple TRPs based on one Downlink Control Information (DCI).

[0038] FIG. 1C shows an example of a case where each of the multiple TRPs transmits a part of the control signal to the UE, and the multiple TRPs transmit data signals (which may be called a master-slave mode). Part 1 of the control signal (DCI) may be transmitted in TRP1, and part 2 of the control signal (DCI) may be transmitted in TRP2. Part 2 of the control signal may depend on part 1. The UE receives each PDSCH transmitted from the multiple TRP based on these parts of DCI.

[0039] FIG. 1D shows an example of a case where each of the multiple TRPs transmits a separate control signal to the UE, and the multiple TRPs transmit data signals (which may be called a multi-master mode). A first control signal (DCI) may be transmitted from TRP1, and a second control signal (DCI) may be transmitted from TRP2. The UE receives each PDSCH transmitted from the multiple TRPs based on these DCIs.

[0040] When multiple PDSCHs from multiple TRPs as shown in FIG. 1B (may be called multiple PDSCHs) are scheduled using one DCI, the DCI may be called a single DCI (single PDCCH). Also, when multiple PDSCHs from multiple TRPs as shown in FIG. 1D are scheduled using multiple DCIs, these multiple DCIs may be called multiple DCIs (multiple PDCCHs).

[0041] Each TRP of the multi-TRP may transmit a different code word (CW) and a different layer. As one form of multi-TRP transmission, non-coherent joint transmission (NCJT) is being considered.

[0042] In the NCJT, for example, TRP1 performs modulation mapping and layer mapping on a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP2 performs modulation mapping and layer mapping on a second codeword to transmit a second PDSCH using a second number of layers (e.g., two layers) with a second precoding.

[0043] In addition, multiple PDSCHs (multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap with at least one of the time and frequency resources.

[0044] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a predetermined QCL type (e.g., QCL type D).

[0045] In URLLC for multiple TRPs, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multiple TRPs is supported. It is considered that repetition schemes (URLLC schemes, for example, schemes 1, 2a, 2b, 3, and 4) across multiple TRPs in the frequency domain, layer (spatial) domain, or time domain are supported. In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexed (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexed (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RVs may be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one slot. In scheme 4, multiple PDSCHs from multiple TRPs are transmitted in different slots.

[0046] Such a multi-TRP scenario allows for more flexible transmission control using channels with better quality.

[0047] In the multi-master mode as shown in FIG. 1D, configurations are possible in which the same physical cell ID is set for multiple TRPs (intra-TRP mobility, intra-cell TRP mobility, intra-cell mobility, or intra-cell multi-TRP operation), and configurations are possible in which different physical cell IDs are set for multiple TRPs (inter-TRP mobility, inter-cell TRP mobility, inter-cell mobility, or inter-cell multi-TRP operation).

[0048] Figure 2A is a diagram showing an example of intra-cell mobility. As shown in Figure 2A, the same physical cell ID (PCI1) is set for TRP1 and TRP2. In this case, the SSB (SSB index) transmitted by TRP1 and the SSB transmitted by TRP2 must be different. In the example of Figure 2A, the SSB of TRP1 is 0-31, and the SSB of TRP2 is 32-63.

[0049] FIG. 2B is a diagram showing an example of inter-cell mobility. As shown in FIG. 2B, different physical cell IDs (PCI1, PCI2) are set for TRP1 and TRP2. In this case, the SSB transmitted by TRP1 and the SSB transmitted by TRP2 may overlap or may be different. In the example of FIG. 2B, the SSBs of TRP1 and TRP2 may both be 0-63. Or, the SSB of TRP1 may be 0-31, and the SSB of TRP2 may be 32-63. In this case, the RS of the TCI state of PDSCH1 / PDSCH2 is PCI1 or PCI2.

[0050] (QCL extension) <trp-id> When different physical cell IDs are set for multiple TRPs, the UE may receive information about a downlink reference signal (DL RS) from a non-serving cell (second TRP) among the multiple TRPs by higher layer signaling (RRC), and control transmission of a UL signal based on the information. The information may include, for example, "trp-ToAddModList", "trp-ToReleaseList", "physCellId" (physical cell ID), "TRP-ID", etc., which will be described later. "TRP-ID" may be an identifier (ID) of the second TRP.

[0051] Fig. 3 is a diagram showing a first setting example of RRC. In the diagram shown in Fig. 3, the RRC parameter "ServingCellConfig" includes "trp-ToAddModList" indicating a list of TRPs to be added or changed, "trp-ToReleaseList" indicating a list of TRPs to be released, and the like. In addition, the RRC parameter "TRP-Config" includes "TRP-ID", "physCellId", information on SSB (SSB position (e.g., "ssb-PositionsInBurst"), SSB periodicity (e.g., "ssb-periodicityServingCell"), etc.), and the like.

[0052] "ServingCellConfig" in the present disclosure may be read as "ServingCellConfigCommon". For example, the TRP ID of the serving cell corresponding to "ServingCellConfig" may be 0, and TRP-IDs starting from 1 for other TRPs (additional TRPs) may be set in "trp-Config". The TRP-ID of the second TRP may be 1. Note that in FIG. 3, the contents of "TRP-Config" (such as "TRP-ID", "physCellId", and information related to SSB) may be included in the "trp-ToAddModList" in "ServingCellConfig".

[0053] FIG. 4 is a diagram showing a second setting example of RRC. In the diagram shown in FIG. 4, "trp" ("TRP-ID"), etc. are included in "QCL-Info-r17", which is an RRC parameter related to QCL information. In the present disclosure, "QCL-Info-r17" may be read as "QCL-Info" and "SpatialRelationInfo". In the present disclosure, although "r17" indicates 3GPP Rel. 17, it may be another name indicating a release other than Rel. 15 / 16. The QCL setting indicated by "QCL-Info-r17" may correspond to each TRP (each TRP ID) of the serving cell. When the received "TRP-ID" is 0, the UE may determine that it means the original (its own) serving cell.

[0054] The RS transmitted from the added TRP may be the source RS of the QCL / spatial relation information. "QCL-Info-r17" may be set for all BWPs of the serving cell. And in "ServingCellConfig", information regarding a plurality of TRPs may be set.

[0055] According to the above processing, even when different physical cell IDs are set for a plurality of TRPs, the UE can perform appropriate communication by receiving information regarding the TRP of the serving cell.

[0056] <SSB and Physical Cell ID> The UE may receive at least one of information (SSB index) regarding the SSB of the non-serving cell (second TRP) and the physical cell ID, which is used for setting the TCI state / spatial relation information. The SSB may be set as the source RS of the QCL / spatial relation information. At least one of the information regarding the SSB of the non-serving cell (second TRP) and the physical cell ID is an example of information regarding the downlink reference signal from the second TRP.

[0057] The source RS means an RS that has a QCL relationship with the channel / signal (which may be called a target channel / RS) for which the UL TCI state is set (specified), and may be, for example, a DL RS (e.g., SSB, CSI-RS, TRS, etc.) or a UL RS (e.g., SRS, SRS for beam management, etc.).

[0058] Any target RS may be configured with the TCI state of the SSB of a non-serving cell. Restricted target RS (eg, only TRS) may be configured with the TCI state of the SSB of a non-serving cell.

[0059] The SSB of a non-serving cell may be configured for CSI(L1) measurement / Radio Link Monitoring (RLM) / Beam Failure Detection (BFD).

[0060] Fig. 5 is a diagram showing a third example of RRC settings. As shown in Fig. 5, the RRC parameter "QCL-Info" includes "ssb-index", "physCellId", etc. The "ssb-index" and "physCellId" are examples of information related to the SSB of the non-serving cell and a physical cell ID described above.

[0061] The SSBs of the non-serving cells may be used to distinguish only the PDCCH / PDSCH from the second TRP. The SSBs of the non-serving cells may be used to distinguish only the PDCCH / PDSCH and the L1-RSRP / SINR beam report from the second TRP. The SSBs of the non-serving cells may be used to distinguish only the PDCCH / PDSCH and the L1-RSRP / SINR beam report and the RLM from the second TRP.

[0062] Since DL transmission of multi-TRP is configured for each BWP, the second TRP corresponding to different BWPs in a certain UE may be different. However, since the above "QCL-Info" and "SpatialRelationInfo" are configured for each BWP, there is no need for redundant configuration for each cell, and the configuration can be performed efficiently.

[0063] <nzp-csi-rs> The UE may receive at least one of a scrambling identifier (ID) and a sequence generation configuration in a non-zero power channel state information reference signal (NZP-CSI-RS) resource configuration of the second TRP by higher layer signaling (RRC). Specifically, the UE is configured / instructed in the NZP-CSI-RS resource configuration to configure / instruct new scrambling ID(s) or sequence generation configuration (sequenceGenerationConfig) for CSI-RS sequence generation. The NZP-CSI-RS resource configuration supports the NZP-CSI-RS of a non-serving cell (second TRP). The NZP-CSI-RS resource configuration is an example of information related to a downlink reference signal from the second TRP.

[0064] The new NZP-CSI-RS resource may be a source RS of the TCI state configuration or the SpatialRelationInfo configuration. The new NZP-CSI-RS resource may be configured as a TRS (NZP-CSI-RS resource including TRS information (trs-Info)).

[0065] Fig. 6 is a diagram showing a fourth example of the RRC setting. As shown in Fig. 6, the RRC parameter "CSI-RS-Resource-Mobility" may include "sequenceGenerationConfig" (sequence generation setting). "sequenceGenerationConfig" may be included in other parameters.

[0066] Fig. 7 is a diagram showing a fifth example of the RRC setting. As shown in Fig. 7, the RRC parameter "NZP-CSI-RS-Resource" may include "scramblingID". The "scramblingID" may be included in other parameters.

[0067] The NZP-CSI-RS resource may apply to at least one of an NZP-CSI-RS resource containing TRS information primarily for QCL indication of other TRPs, an NZP-CSI-RS resource corresponding to L1-RSRP / SINR beam measurement, and an NZP-CSI-RS resource with repetition.

[0068] According to the above process, instead of introducing SSB for non-serving cells, the NZP-CSI-RS for non-serving cells is configured as the source RS of QCL, thereby suppressing the impact of specification changes. The UE can perform appropriate communication based on the NZP-CSI-RS resource configuration of the non-serving cells.

[0069] However, in previous NR specifications, inter-cell mobility (handover) when a single TRP is applied has not been sufficiently considered.

[0070] Since multi-TRP follows single-TRP (cell) framework, many settings (e.g. PDCCH / PDSCH settings) are the same (common) among multiple TRPs even if the multiple TRPs have different PCIs. However, the settings of the source serving cell and the target serving cell are different in many ways. Therefore, it is difficult to realize high-speed inter-cell mobility without appropriately changing the settings of the serving cell.

[0071] Therefore, the present inventors have conceived of a terminal having a receiving unit that receives configurations of multiple candidate serving cells that are non-serving cells by higher layer signaling when communicating with one transmission / reception point, and a control unit that changes the serving cell to the candidate serving cell indicated by the instruction when an instruction indicating one of the multiple candidate serving cells is received. According to one aspect of the present disclosure, high-speed inter-cell mobility can be realized.

[0072] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0073] In addition, in the present disclosure, panel, Uplink (UL) transmitting entity, TRP, TRP-ID, TRP ID, spatial relationship, control resource set (CONTROLL RESOURCE SET (CORESET)), PDSCH, codeword, base station, specific antenna port (e.g., DeModulation Reference Signal (DMRS) port), specific antenna port group (e.g., DMRS port group), specific group (e.g., Code Division Multiplexing (CDM) group, specific reference signal group, CORESET group), CORESET pool, may be read as interchangeable. Also, panel identifier (ID) and panel may be read as interchangeable.

[0074] In addition, in the present disclosure, NCJT, NCJT using multi-TRP, multi-PDSCH using NCJT, multi-PDSCH, multiple PDSCH from multi-TRP, etc. may be read as interchangeable. Note that multi-PDSCH may mean multiple PDSCHs in which at least a part of time resources (e.g., one symbol) overlap, may mean multiple PDSCHs in which all of time resources (e.g., all symbols) overlap, may mean multiple PDSCHs in which all of time resources do not overlap, may mean multiple PDSCHs carrying the same TB or the same CW, or may mean multiple PDSCHs to which different UE beams (spatial domain receive filters, QCL parameters) are applied.

[0075] In the present disclosure, cell, CC, carrier, BWP, and band may be read as interchangeable.

[0076] In the present disclosure, the terms index, ID, indicator, and resource ID may be interchangeable.

[0077] TCI state, TCI state or QCL assumption, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, spatial domain filter, UE receive beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS of QCL type D in TCI state or QCL assumption, RS of QCL type A in TCI state or QCL assumption may be interchangeable. RS of QCL type D, DL-RS associated with QCL type D, DL-RS with QCL type D, source of DL-RS, SSB, CSI-RS may be interchangeable.

[0078] In the present disclosure, the TCI state may be information about a receive beam (spatial domain receive filter) instructed (configured) for the UE (e.g., DL-RS, QCL type, cell in which DL-RS is transmitted, etc.). The QCL assumption may be information about a receive beam (spatial domain receive filter) assumed by the UE based on transmission or reception of an associated signal (e.g., PRACH, DL-RS, QCL type, cell in which DL-RS is transmitted, etc.).

[0079] In the present disclosure, spatial relationship, spatial relationship information, spatial relationship assumption, QCL parameter, spatial domain transmit filter, UE spatial domain transmit filter, spatial domain filter, UE transmit beam, UL transmit beam, UL precoding, UL precoder, spatially related RS, DL-RS, QCL assumption, SRI, spatial relationship based on SRI, and UL TCI may be interpreted as interchangeable.

[0080] In the present disclosure, TRS, CSI-RS for tracking, CSI-RS having TRS information (higher layer parameter trs-Info), and NZP-CSI-RS resource in an NZP-CSI-RS resource set having TRS information may be read as interchangeable.

[0081] In the present disclosure, DCI format 0_0, DCI not including SRI, DCI not including spatial relationship indication, and DCI not including CIF may be read as interchangeable. In the present disclosure, DCI format 0_1, DCI including SRI, DCI including spatial relationship indication, and DCI including CIF may be read as interchangeable.

[0082] In this disclosure, a path loss reference RS, a path loss reference RS, a path loss estimation RS, a path loss calculation RS, a pathloss(PL)-RS, an index q d The terms "RS used in path loss calculation", "RS resource used in path loss calculation", and "calculated RS" may be interchangeable. The terms "calculate", "estimate", and "measure" may be interchangeable.

[0083] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, TCI state pool, multiple TCI states, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS of QCL type D in TCI state / QCL assumption, RS of QCL type A in TCI state / QCL assumption, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, PL-RS, may be read as interchangeable. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, SRS, may be read as interchangeable.

[0084] In the present disclosure, normal TRP, single TRP, single TRP system, single TRP transmission, and single PDSCH may be interchangeable. In the present disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be interchangeable. In the present disclosure, single DCI, single PDCCH, multi-TRP based on single DCI, and activating two TCI states on at least one TCI codepoint may be interchangeable.

[0085] In the present disclosure, a single TRP, a channel using a single TRP, a channel using one TCI state / spatial relationship, multi-TRP not being enabled by RRC / DCI, multiple TCI states / spatial relationships not being enabled by RRC / DCI, a CORESETPoolIndex value of one not being set for any CORESET and no code point in the TCI field being mapped to two TCI states, communication with one transmission / reception point, and application of a single TRP may be read as interchangeable.

[0086] In the present disclosure, multi-TRP, channel using multi-TRP, channel using multiple TCI states / spatial relationships, multi-TRP being enabled by RRC / DCI, multiple TCI states / spatial relationships being enabled by RRC / DCI, and at least one of multi-TRP based on a single DCI and multi-TRP based on a multiple DCI may be read as mutually interchangeable. In the present disclosure, multi-TRP based on a multiple DCI, and a CORESETPoolIndex value of 1 being set for CORESET may be read as mutually interchangeable. In the present disclosure, multi-TRP based on a single DCI, and at least one code point of a TCI field being mapped to two TCI states may be read as mutually interchangeable.

[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 embodiments may be applied alone or in combination. In the present disclosure, "A / B" may be read as "at least one of A and B."

[0088] (Wireless communication method) <First embodiment> When communicating with one TRP (when a single TRP is applied), layer1 / layer2 (L1 / L2) inter-cell mobility of the UE is configured only for multiple cells having almost the same serving cell configurations. For example, when at least one of the PDCCH / PDSCH configuration (DL BWP configuration) and the PUCCH / PUSCH configuration (UL BWP configuration) in multiple cells is the same, L1 / L2 inter-cell mobility may be configured. When the configurations other than the QCL / PCI / SSB / CSI-RS / SRS configuration are the same, L1 / L2 inter-cell mobility may be configured.

[0089] In this case, the UE can perform inter-cell mobility (handover) according to instructions from the MAC CE / DCI without receiving configuration via RRC signaling.

[0090] Similar to the multi-TRP inter-cell mobility, the L1 / L2 inter-cell mobility of the present embodiment is enabled by various configurations described in the above-mentioned "QCL extension". That is, the UE does not need to update most of the serving cell configurations.

[0091] Figure 8 is a diagram showing an application example of a single TRP. In Figure 8, only one TRP (TRP1) of the multiple TRPs transmits to the UE. As described above, the serving cell configuration (serving cell config#1) of TRP1 and the serving cell configuration (serving cell config#3) of TRP3 are almost the same, and L1 / L2 inter-cell mobility is configured for TRP1 and TRP3.

[0092] For example, when at least one of the following (1) to (3) is satisfied, L1 / L2 inter-cell mobility may be configured between cells. (1) The serving cell settings between cells are the same. (2) At least the PDCCH / PDSCH settings are the same across multiple cells. (3) At least one of the PDCCH / PDSCH / PUCCH / PUSCH settings is the same, except for the QCL / PCI / SSB / CSI-RS / SRS settings.

[0093] <Second embodiment> When communicating with one TRP (when a single TRP is applied), the UE receives in advance the configuration of multiple candidate serving cells that are non-serving cells corresponding to the frequency by higher layer signaling (RRC reconfiguration signaling). Then, when the UE receives an instruction indicating one of the multiple candidate serving cells by MAC CE / DCI, the UE changes the serving cell to the candidate serving cell indicated by the instruction (hands over). Note that the candidate serving cell configuration and the candidate serving cell configuration may be interpreted as interchangeable.

[0094] The number of candidate serving cell configurations may be upper-bounded. The upper bound may be a fixed value or may be a variable value set by higher layer signaling, etc. The UE receives a serving cell change indication by MAC CE / DCI to enable L1 / L2 inter-cell mobility.

[0095] When the UE receives a MAC CE / DCI indicating a serving cell change (update), the UE changes to the indicated serving cell with the updated serving cell configuration after a certain period of time. The certain period of time may be X ms / X symbols from the indication by the MAC CE / DCI. The certain period of time may be Y ms / Y symbols from the HARQ-ACK feedback for the MAC CE / DCI.

[0096] The MAC CE / DCI indicating the serving cell change may include a serving cell index, PCI, or other ID for the serving cell. The UE may interpret other fields in the MAC CE / DCI as an indication of the serving cell to be changed.

[0097] For example, in the example of Fig. 8, when the second embodiment is applied, in addition to the serving cell configuration of TRP1 (serving cell config#1), the UE is configured with candidate serving cell configurations (serving cell configuration of TRP2 (serving cell config#2) and serving cell configuration of TRP3 (serving cell config#3)). Then, when the UE receives a MAC CE / DCI instructing a serving cell change, the UE updates the serving cell configuration to the candidate serving cell configuration.

[0098] For example, when the UE receives a MAC CE / DCI instructing the serving cell setting of TRP2, the UE changes the serving cell setting to the serving cell setting of TRP2 and changes the serving cell to the serving cell of TRP2 (performs handover).

[0099] According to the second embodiment, a serving cell change (handover) is performed in response to an instruction of a MAC CE / DCI using a candidate serving cell configuration received in advance, so that quick inter-cell mobility can be realized.

[0100] <Third embodiment> Control may be performed by combining the first embodiment and the second embodiment. The UE receives (is configured) the configuration of multiple candidate serving cells that are non-serving cells corresponding to the frequency by higher layer signaling (RRC reconfiguration signaling). Then, when the UE receives information (QCL / TCI) related to the QCL of the non-serving cell by MAC CE or DCI, the UE changes (hands over) the serving cell to a candidate serving cell corresponding (related) to the non-serving cell, and applies the QCL. The information related to the QCL is various configuration information described in the above-mentioned "QCL extension". That is, the above-mentioned "QCL extension" may be supported / configured / applied.

[0101] For example, if the QCL / TCI associated with the RS of a non-serving cell is indicated by the DCI for the PDSCH, after a certain period of time, the UE may change the serving cell to the non-serving cell (candidate serving cell) using the configuration of the corresponding (associated) candidate serving cell of the non-serving cell, and apply the indicated QCL / TCI. The certain period of time may be the same as that shown in the second embodiment.

[0102] For example, if a QCL / TCI associated with an RS of a non-serving cell is activated by a MAC CE for PDCCH / PDSCH, the UE may change the serving cell to the non-serving cell (candidate serving cell) using the configuration of the corresponding (associated) candidate serving cell of the non-serving cell and apply the activated QCL / TCI.

[0103] It is noted that all QCLs / TCIs ​​activated by a MAC CE for PDCCH / PDSCH are preferably associated with the same serving cell, which can prevent dynamic (frequent) changes in serving cell configuration.

[0104] <Fourth embodiment> When multiple candidate serving cell configurations corresponding to a frequency are configured, the UE may simultaneously apply / maintain / support / hold at least two (multiple) candidate serving cell configurations among the multiple candidate serving cell configurations. The UE may simultaneously communicate with multiple serving cells corresponding to the multiple candidate serving cell configurations. This is a procedure similar to Dual active protocol stack based handover (DAPS HO). That is, the UE simultaneously applies the candidate serving cell configuration before the change and the candidate serving cell configuration after the change for a specific period during handover. Then, when the UE receives an instruction indicating one of the multiple candidate serving cells, it changes (hands over) to the candidate serving cell indicated by the instruction.

[0105] An upper limit may be set for the number of configurations (the number of candidate serving cells). The upper limit may be a fixed value, or may be a variable value set by higher layer signaling or the like.

[0106] The UE may perform the above process (processing of the fourth embodiment) when different QCL / TCIs ​​associated with both the serving cell's RS and the non-serving cell's RS are configured / indicated / activated by the MAC CE / DCI for the PDCCH / PDSCH.

[0107] The UE maintains / supports / keeps two serving cell configurations with both frequency-corresponding cells as serving cells. And the UE receives DL signals from the two serving cells simultaneously. Based on the UE capability, Time Division Multiplexing (TDM) or Space Division Multiplexing (SDM) is used for the actual DL signal reception. For reception of different / dynamic PDCCH / PDSCH associated with different cells, the UE uses different serving cell configurations.

[0108] <CORESET#0> To support complete inter-cell mobility, it is preferable to enable QCL changes for CORESET#0 (controlResourceSetZero). QCL, TCI, TCI state, and beam may be mutually interchangeable.

[0109] The UE may be configured / instructed by MAC CE to set the TCI state (RS from non-serving cell) of the non-serving cell for CORESET#0.

[0110] In single-TRP operation, when a new serving cell with an updated serving cell configuration is indicated, the configuration of CORESET#0 may be updated to the configuration of CORESET#0 of the new serving cell (including the configuration of the TCI state).

[0111] The QCL of CORESET#0 may be related to the most recent (newest) PRACH related to the SSB. This is the same as in 3GPP Rel.15. In this case, in the PRACH procedure, the QCL of CORESET#0 on the new serving cell may be updated.

[0112] <UE Capability> The UE may report at least one of the following (1) to (11) as UE capability (capability). The application of each embodiment may be limited to a UE that reports at least one of the following (1) to (11) as UE capability.

[0113] (1) Whether it supports multiple candidate serving cell configurations for each frequency for the UE. (2) The maximum number per frequency of multiple candidate serving cell configurations for the UE. (3) The maximum number of multiple candidate serving cell configurations for the UE. (4) Whether it supports serving cell changes by MAC CE / DCI. (5) Whether it supports changing QCL to change the serving cell to a non-serving cell with a serving cell configuration for update. (6) Does it support maintaining / retaining multiple candidate serving cell settings per frequency for a UE? (7) Does it support maintaining / retaining multiple serving cell settings per frequency for a UE? (8) Maximum number of multiple serving cell configurations for a UE per frequency. (9) Maximum number of multiple serving cell configurations for a UE. (10) Does it support indication of multiple serving cells by RRC signaling / MAC CE? (11)Does it support CORESET#0 configuration / QCL update?

[0114] <Other> The above embodiments will be compared with other techniques, and advantages, etc. will be described. For example, in the above-mentioned multi-TRP supporting QCL extension, when NCJT is supported between TRPs of different PCIs, it is possible to switch S-TRP operation depending on the TCI state of DCI.

[0115] For example, Fig. 9 is a diagram showing an example of handover of multiple TRPs. In Fig. 9, handover from TRP1 to TRP2 can be performed quickly by the instruction of the TCI state by DCI (TCI#1 only or TCI#2 only). However, in the example of Fig. 9, in order to enable inter-cell mobility for a non-serving cell (PCI#2), it is necessary that almost the same serving cell configuration is set for each TRP.

[0116] FIG. 10A is a diagram showing an example in which the same serving cell is configured for multiple TRPs. In this case, no RRC signaling is required to change the serving cell configuration, and for example, a change by MAC CE / DCI is sufficient. Since the difference between the two serving cell configurations is only the TCI state, inter-cell mobility is completed by only updating the TCI state. Note that, since it is considered that the PCI is included in the TCI state in Rel. 17, the PCI of the serving cells may be different. FIG. 10A corresponds to the first embodiment when a single TRP is applied.

[0117] Fig. 10B is a diagram showing an example of a conventional Layer 3 (L3) handover. In the example shown in Fig. 10B, at the time of handover, the UE needs to switch the application of the serving cell setting #1 to the serving cell setting #2 by RRC signaling.

[0118] Fig. 10C is a diagram showing an example of DAPS HO. In the example shown in Fig. 10C, the UE switches the application from serving setting #1 to serving setting #2 by RRC signaling during handover, but maintains both serving setting #1 and serving setting #2 during the period when handover is performed. As described above, in the examples of Fig. 10B and Fig. 10C, reconfiguration by RRC signaling is required.

[0119] Fig. 11 is a diagram showing an example of a serving cell configuration in the second embodiment. As described above, in the second embodiment, when the RRC configurations other than the TCI state are different in the configurations of two serving cells, a candidate serving cell configuration is set in advance in the UE by RRC or the like. In the example shown in Fig. 11, in addition to the serving cell configuration #1, candidate serving cell configurations #2 and #3 are set in advance.

[0120] Then, at the time of handover, one of the candidate serving cell configurations is applied (activated) by MAC CE / DCI instead of RRC reconfiguration, thereby enabling rapid L1 / L2 inter-cell mobility. In the example of Fig. 11, the candidate serving cell configuration #2 is activated, and the UE performs rapid handover to the serving cell corresponding to the candidate serving cell configuration #2.

[0121] In the second to fourth embodiments, there are few restrictions on the serving cell configuration, and it is possible for a network (e.g., a base station, a gNB) to flexibly support L1 / L2 inter-cell mobility. For example, even if the configurations of two serving cells are different (not only in terms of the TCI state), it is possible to quickly perform L1 / L2 inter-cell mobility. In this case, it is not necessary to change the serving cell by the PRACH procedure.

[0122] <Modification> In the second to fourth embodiments, the frequencies of the candidate serving cells may be the same as each other, or may be the same as the current serving cell. Alternatively, the frequencies of the candidate serving cells may be different from the current serving cell. That is, inter-frequency mobility may be supported.

[0123] The process of each embodiment may be applied only when Carrier Aggregation (CA) is not applied, or may be applied together with CA. When CA is applied, Pcell and PScell ​​are changed according to the process of the embodiment. The setting of Scell ​​may be released / deactivated in advance, or may not be changed.

[0124] (Wireless communication system) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0125] 12 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0126] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0127] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN) and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN and the LTE (E-UTRA) base station (eNB) is the SN.

[0128] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0129] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0130] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0131] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0132] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0133] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0134] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0135] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0136] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0137] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0138] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0139] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0140] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0141] 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.

[0142] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0143] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0144] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0145] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0146] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0147] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0148] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0149] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0150] (base station) 13 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0151] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0152] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0153] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0154] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0155] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0156] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0157] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0158] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0159] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0160] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0161] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0162] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0163] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0164] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0165] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0166] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0167] When the terminal communicates with one transmission / reception point, the transmission / reception unit 120 may transmit to the terminal a configuration of multiple candidate serving cells that are non-serving cells by higher layer signaling. When an instruction indicating any one of the multiple candidate serving cells is transmitted, the serving cell of the terminal is changed to the candidate serving cell indicated by the instruction.

[0168] (User terminal) 14 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 transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0169] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0170] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0171] 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.

[0172] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0173] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0174] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0175] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0176] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0177] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0178] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0179] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0180] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0181] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0182] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0183] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0184] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0185] When communicating with one transmission / reception point, the transceiver 220 may receive configurations of multiple candidate serving cells, which are non-serving cells, through higher layer signaling. The indication may be sent through a media access control control element or downlink control information.

[0186] When the control unit 210 receives an instruction indicating any one of the plurality of candidate serving cells, the control unit 210 may change the serving cell to the candidate serving cell indicated by the instruction. When the control unit 210 receives information regarding quasi-co-location of a non-serving cell, the control unit 210 may change the serving cell to the candidate serving cell corresponding to the non-serving cell and apply the quasi-co-location. The control unit 210 may simultaneously apply at least two of the configurations of the plurality of candidate serving cells.

[0187] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0188] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0189] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 15 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0190] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0191] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0192] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0193] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0194] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0195] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0196] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0197] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0198] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0199] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0200] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0201] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0202] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0203] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0204] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0205] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0206] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0207] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0208] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0209] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0210] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0211] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0212] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0213] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0214] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0215] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0216] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0217] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0218] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0219] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0220] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0221] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0222] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0223] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0224] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0225] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0226] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0227] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0228] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0229] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0230] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0231] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0232] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0233] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0234] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0235] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0236] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0237] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0238] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0239] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0240] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0241] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0242] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0243] Each aspect / embodiment described in the present disclosure may be implemented using any of a wide variety of standards, including Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems using 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other appropriate wireless communication methods, next-generation systems that are based on these, etc. Also, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0244] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0245] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0246] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0247] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0248] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0249] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0250] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0251] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0252] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0253] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0254] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0255] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. A receiving unit that receives configurations of a plurality of candidate cells that are non-serving cells by Radio Resource Control (RRC) signaling, and receives information regarding a Transmission Configuration Indication (TCI) state of any one of the plurality of candidate cells by a Medium Access Control Control Element (MAC CE); A control unit that changes a serving cell to the candidate cell corresponding to the TCI state and applies the TCI state; A terminal having the above configuration.

2. The receiving unit receives Downlink Control Information (DCI) including a cell index indicating any one of the plurality of candidate cells. The terminal according to claim 1.

3. receiving configurations of a plurality of candidate cells, which are non-serving cells, by Radio Resource Control (RRC) signaling, and receiving information on a Transmission Configuration Indication (TCI) state of any of the plurality of candidate cells by a Medium Access Control Control Element (MAC CE); changing a serving cell to the candidate cell corresponding to the TCI state and applying the TCI state; A wireless communication method for a terminal comprising:

4. A control unit; A transmitter that transmits configurations of a plurality of candidate cells that are non-serving cells by Radio Resource Control (RRC) signaling, and transmits information on a Transmission Configuration Indication (TCI) state of any of the plurality of candidate cells by a Medium Access Control Control Element (MAC CE), A serving cell of the terminal is changed to the candidate cell corresponding to the TCI state, and the TCI state is applied. Base station.

5. A system including a terminal and a base station, The base station, A transmitter that transmits configurations of a plurality of candidate cells that are non-serving cells by Radio Resource Control (RRC) signaling, and transmits information on a Transmission Configuration Indication (TCI) state of any of the plurality of candidate cells by a Medium Access Control Control Element (MAC CE), The terminal includes: a receiving unit for receiving the setting and the information; A control unit that changes a serving cell to the candidate cell corresponding to the TCI state and applies the TCI state; A system having

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