Terminal, wireless communication method, base station, and system

Abstract

A terminal according to one embodiment of the present disclosure is characterized by comprising: a reception unit for receiving an instruction relating to a beam; and a control unit for selecting, on the basis of the instruction, one cell radio network temporary identifier (C-RNTI) from among a plurality of C-RNTIs, when a serving cell is updated according to the instruction. One embodiment of the present disclosure makes it possible to suitably select a C-RNTI.

Description

Technical Field

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

Background Art

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

[0003] A successor system to LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G+(plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) is also under consideration.

[0004] In an existing LTE system (for example, 3GPP Rel. 8-14), a user terminal (User Equipment (UE)) transmits uplink control information (Uplink Control Information (UCI)) using at least one of a UL data channel (for example, Physical Uplink Shared Channel (PUSCH)) and a UL control channel (for example, Physical Uplink Control Channel (PUCCH)).

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In future wireless communication systems (e.g., NR), layer 1 / layer 2 (L1 / L2) inter-cell mobility that facilitates more efficient (achieving lower latency and overhead) DL / UL beam management is being considered.

[0007] In L1 / L2 inter-cell mobility, it is possible to change the serving cell using functions such as beam control without resetting Radio Resource Control (RRC). In other words, it is possible to transmit and receive with a non-serving cell without handover. Since a data communication unavailable period occurs, such as the need for RRC reconnection for handover, L1 / L2 inter-cell mobility that does not require handover is preferable.

[0008] However, it may not be possible to directly use the Cell Radio Network Temporary Identifier (C-RNTI) used in the serving cell for transmission and reception with a non-serving cell. For example, the C-RNTI used in the serving cell may already be used for another user terminal (User Equipment (UE)) in the non-serving cell. If the same C-RNTI is used among UEs in the same cell, problems may occur, such as accidentally being able to read downlink control information addressed to other UEs.

[0009] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately select a C-RNTI.

Means for Solving the Problem

[0010] A terminal according to an aspect of the present disclosure includes a receiving unit that receives an update instruction of a serving cell, and a control unit that, when the serving cell is updated according to the update instruction, selects one C-RNTI from a plurality of Cell Radio Network Temporary Identifiers (C-RNTIs) based on the update instruction. to update from the first cell to the second cell

Advantages of the Invention

[0011] According to an aspect of the present disclosure, a C-RNTI can be appropriately selected.

Brief Description of the Drawings

[0012]

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DETAILED DESCRIPTION OF THE INVENTION

[0013] (TCI, Spatial Relationship, QCL) In NR, it is considered to control at least one of signal and channel (referred to as signal / channel) in a UE, such as reception processing (e.g., at least one of reception, demapping, demodulation, decoding), transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, encoding) based on a transmission configuration indication state (Transmission Configuration Indication state (TCI state)).

[0014] The TCI state may represent what is applied to a downlink signal / channel. What corresponds to the TCI state applied to an uplink signal / channel may be expressed as a spatial relation.

[0015] The TCI state is information regarding quasi-co-location (QCL) of a signal / channel, and may be referred to as a spatial reception parameter, spatial relation information, etc. The TCI state may be set for each channel or each signal in the UE.

[0016] QCL is an index indicating the statistical properties of a signal / channel. For example, when a certain signal / channel and another signal / channel are in a QCL relationship, it may mean that at least one of Doppler shift, Doppler spread, average delay, delay spread, spatial parameter (e.g., spatial Rx parameter) is the same among these different signals / channels (QCL for at least one of these).

[0017] Note that the spatial reception parameter may correspond to the reception beam of the UE (for example, the reception analog beam), and the beam may be specified based on spatial QCL. The QCL (or at least one element of QCL) in the present disclosure may be read as sQCL (spatial QCL).

[0018] Multiple types (QCL types) of QCL may be defined. For example, four QCL types A - D with different parameters (or parameter sets) that can be assumed to be the same may be provided, and the parameters (which may also be called QCL parameters) are shown below: · QCL type A (QCL - A): Doppler shift, Doppler spread, average delay, and delay spread, · QCL type B (QCL - B): Doppler shift and Doppler spread, · QCL type C (QCL - C): Doppler shift and average delay, · QCL type D (QCL - D): Spatial reception parameter.

[0019] The UE's assumption that a given control resource set (Control Resource Set (CORESET)), channel, or reference signal is in a relationship with another CORESET, channel, or reference signal and a specific QCL (for example, QCL type D) may be called a QCL assumption.

[0020] The UE may determine at least one of the transmission beam (Tx beam) and the reception beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0021] The TCI state may be, for example, information regarding the QCL between the target channel (in other words, the reference signal (Reference Signal (RS)) for the channel) and another signal (for example, another RS). The TCI state may be set (indicated) by upper layer signaling, physical layer signaling, or a combination thereof.

[0022] In the present disclosure, the upper layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0023] The MAC signaling may use, 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), a Remaining Minimum System Information (RMSI), an Other System Information (OSI), etc.

[0024] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0025] The channel for which the TCI state or the spatial relation is set (specified) may be, for example, at least one of a Physical Downlink Shared Channel (PDSCH), a Physical Downlink Control Channel (PDCCH), a Physical Uplink Shared Channel (PUSCH), and a Physical Uplink Control Channel (PUCCH).

[0026] In addition, the RS related to the channel and QCL 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 CSI-RS for tracking (also called a Tracking Reference Signal (TRS)), and a reference signal for QCL detection (also called a QRS).

[0027] The SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). The SSB may be referred to as an SS / PBCH block.

[0028] The information element of the TCI state (the "TCI-state IE" in RRC) set by upper layer signaling may include one or more QCL information ("QCL-Info"). The QCL information may include at least one of information on the RS related to the QCL relationship (RS relationship information) and information indicating the QCL type (QCL type information). The RS relationship information may include information such as the index of the RS (for example, the SSB index, the Non-Zero-Power (NZP) CSI-RS resource ID (Identifier)), the index of the cell where the RS is located, and the index of the Bandwidth Part (BWP) where the RS is located.

[0029] In Rel.15 NR, as at least one TCI state of the PDCCH and the PDSCH, both an RS of QCL type A and an RS of QCL type D, or only an RS of QCL type A may be set for the UE.

[0030] When the TRS is set as the RS of QCL type A for the RS of QCL type A, unlike the demodulation reference signal (DMRS) of PDCCH or PDSCH, it is assumed that the same TRS is transmitted periodically over a long period of time. The UE can measure the TRS and calculate the average delay, delay spread, etc.

[0031] For a UE that sets the TRS as the RS of QCL type A in the TCI state of the DMRS of PDCCH or PDSCH, since it can be assumed that the QCL type A parameters (average delay, delay spread, etc.) of the DMRS of PDCCH or PDSCH and the TRS are the same, the type A parameters (average delay, delay spread, etc.) of the DMRS of PDCCH or PDSCH can be obtained from the measurement results of the TRS. When performing channel estimation on at least one of PDCCH and PDSCH, the UE can use the measurement results of the TRS to perform more accurate channel estimation.

[0032] A UE with an RS of QCL type D set can determine the UE reception beam (spatial domain reception filter, UE spatial domain reception filter) using the RS of QCL type D.

[0033] The RS of QCL type X in the TCI state may mean an RS that is related to a certain channel / signal (DMRS) and QCL type X, and this RS may also be called the QCL source of QCL type X in the TCI state.

[0034] (Multi-TRP) In NR, it is being considered that one or more transmission / reception points (TRP) (multi-TRP) perform DL transmission to the UE using one or more panels (multi-panel). Also, it is being considered that the UE performs UL transmission to one or more TRP.

[0035] Note that multiple TRPs may correspond to the same cell identifier (cell Identifier (ID)), or may correspond to different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0036] Figures 1A - 1D are diagrams showing an example of a multi - TRP scenario. In these examples, each TRP is assumed to be able to transmit four different beams, but is not limited to this.

[0037] Figure 1A shows an example of a case where only one of the multi - TRPs (TRP1 in this example) transmits to the UE (which 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.

[0038] Figure 1B shows an example of a case where only one of the multi - TRPs (TRP1 in this example) transmits a control signal to the UE, and the multi - TRP transmits a data signal (which may be called single - master mode). The UE receives each PDSCH transmitted from the multi - TRP based on one piece of downlink control information (Downlink Control Information (DCI)).

[0039] Figure 1C shows an example of a case where each of the multi - TRPs transmits a part of the control signal to the UE, and the multi - TRP transmits a data signal (which may be called master - slave mode). In TRP1, part 1 of the control signal (DCI) may be transmitted, and in TRP2, part 2 of the control signal (DCI) may be transmitted. Part 2 of the control signal may depend on part 1. The UE receives each PDSCH transmitted from the multi - TRP based on these parts of the DCI.

[0040] FIG. 1D shows an example of a case (which may be referred to as a multi-master mode) where each of the multi-TRPs transmits a separate control signal to the UE and the multi-TRP transmits a data signal. In TRP1, a first control signal (DCI) may be transmitted, and in TRP2, a second control signal (DCI) may be transmitted. The UE receives each PDSCH transmitted from the multi-TRP based on these DCIs.

[0041] When scheduling multiple PDSCHs (which may be referred to as multi-PDSCH (multiple PDSCH)) from a multi-TRP as in FIG. 1B using one DCI, the DCI may be referred to as a single DCI (single PDCCH). Also, when scheduling multiple PDSCHs from a multi-TRP as in FIG. 1D using multiple DCIs respectively, these multiple DCIs may be referred to as multi-DCIs (multi-PDCCH (multiple PDCCH)).

[0042] From each TRP of the multi-TRP, different code words (Code Word (CW)) and different layers may be transmitted. As a form of multi-TRP transmission, Non-Coherent Joint Transmission (NCJT) is being considered.

[0043] In NCJT, for example, TRP1 modulates and maps a first code word, layer-maps it, and transmits a first PDSCH using a first precoding for a first number of layers (e.g., 2 layers). Also, TRP2 modulates and maps a second code word, layer-maps it, and transmits a second PDSCH using a second precoding for a second number of layers (e.g., 2 layers).

[0044] Note that multiple PDSCHs (multi-PDSCH) to be NCJT may be defined to partially or completely overlap with respect to at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap in at least one of the time and frequency resources.

[0045] These first PDSCH and second PDSCH may be assumed to be not quasi-co-located. Reception of the multi-PDSCH may be read as simultaneous reception of PDSCHs that are not of a predetermined QCL type (for example, QCL type D).

[0046] In URLLC for multi-TRP, it is being considered to support repetition of PDSCH (transport block (TB) or codeword (CW)) across multi-TRP. It is being considered to support repetition schemes (URLLC schemes, for example, schemes 1, 2a, 2b, 3, 4) across multi-TRP in the frequency domain or layer (spatial) domain or time domain. In scheme 1, the multi-PDSCH from multi-TRP is space division multiplexing (SDM). In schemes 2a, 2b, the PDSCH from multi-TRP is frequency division multiplexing (FDM). In scheme 2a, the redundancy version (RV) is the same for multi-TRP. In scheme 2b, the RV for multi-TRP may be the same or different. In schemes 3, 4, the multi-PDSCH from multi-TRP is time division multiplexing (TDM). In scheme 3, the multi-PDSCH from multi-TRP is transmitted within one slot. In scheme 4, the multi-PDSCH from multi-TRP is transmitted in different slots.

[0047] According to such a multi-TRP scenario, more flexible transmission control using high-quality channels is possible.

[0048] In the multi-master mode as shown in FIG. 1D, a configuration in which the same physical cell ID is set for a plurality of TRPs (intra-TRP mobility, intra-cell TRP mobility, intra-cell mobility, or intra-cell multi-TRP operation), and a configuration in which different physical cell IDs are set for a plurality of TRPs (inter-TRP mobility, inter-cell TRP mobility, inter-cell mobility, or inter-cell multi-TRP operation) are conceivable.

[0049] FIG. 2A is a diagram showing an example of intra-cell mobility. As shown in FIG. 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 need to be different. In the example of FIG. 2A, the SSB of TRP1 is 0 - 31, and the SSB of TRP2 is 32 - 63.

[0050] 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. Alternatively, 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.

[0051] (Unified / Common TCI Framework) [[ID=...]] According to the unified TCI framework, the UL and DL channels can be controlled by a common framework. Instead of specifying the TCI state or spatial relationship for each channel or RS as in Rel.15, the unified TCI framework may indicate a common beam and apply it to all or some of the multiple channels and RSs for UL and DL, or apply a common beam for UL to all or some of the multiple channels and RSs for UL and apply a common beam for DL to all or some of the multiple channels and RSs for DL. For a certain channel or RS, a common beam may be applied to all resources or to some (one or more) resources. Which channels / RSs to apply to and which resources to apply to may be specified in the specification in advance or indicated to the UE by upper layer control information.

[0052] One common beam for both DL and UL, or a common beam for DL and a common beam for UL (two common beams in total) are being considered.

[0053] The UE may assume the same TCI state (joint TCI state, joint TCI state pool) for UL and DL.

[0054] Figure 3 is a diagram showing an example of joint common TCI indication for UL / DL. In the example of Figure 3, the RRC (parameters, information elements) sets a plurality of unified TCI states used for both DL and UL. Each of the plurality of TCI states may have an SSB, CSI-RS, or SRS as a QCL source RS. Note that one circle symbol shown in Figure 3 (and Figure 4 described later) may correspond to one or two TCI states for UL / DL. The MAC CE may activate at least some of the set plurality of TCI states.

[0055] One DCI for UL / DL may indicate one of a plurality of TCI states activated by a MAC CE. The indicated TCI state may be applied to any one or a subset of all UL / DL. One TCI state indicated by the DCI may be applied to both UL and DL. Two TCI states indicated by the DCI may be applied to UL / DL respectively.

[0056] For the indication by the DCI, the "TCI state" field in the DCI for DL may be used, or a new field for unified TCI in the DCI for UL / DL (for example, "new unified-TCI" field) may be used, or a new field in a new DCI format applied to the unified TCI may be used.

[0057] As described above, in the joint common TCI indication for UL / DL, one DCI indicates both the UL TCI and the DL TCI.

[0058] Figure 4 shows an example of a separate common TCI indication for UL / DL. In the example of Figure 4, RRC (parameters, information elements) sets a plurality of unified TCI states used for both DL and UL. Each of the plurality of TCI states may have an SSB, CSI-RS, or SRS as a QCL source RS. The MAC CE may activate at least a part of the set plurality of TCI states. One or more activated TCI states (TCI state pool) may be set (activated) separately for UL and DL.

[0059] The DCI for DL may indicate one of a plurality of TCI states activated by a MAC CE. The DCI may be a new DCI format applied to the unified TCI. The indicated TCI state may be applied to any one or a subset of all DL.

[0060] The DCI for UL may indicate one of the multiple TCI states activated by the MAC CE. The DCI may be a new DCI format applied to the unified TCI. The indicated TCI state may be applied to any one or a subset of all ULs.

[0061] As described above, in the separate common TCI indication for UL / DL, different DCIs indicate separate TCI states (separate TCI states) for UL and DL respectively.

[0062] (L1 / L2 cell mobility) Figure 5 is a diagram showing an example of switching of TCI states. The QCL source RS of TCI#1 is related to the serving cell, and the QCL source RS of TCI#2 is related to the non-serving cell. When the UE receives an update instruction from TCI#1 to TCI#2, the UE refers to the upper layer parameters (RRC parameters) related to the cell associated with the updated TCI#2.

[0063] If the UE receives signals from only one TRP at a time, it may support dynamic point selection (DPS) between PCIs. In the methods up to Rel.16, the UE updated the TCI state explicitly by RRC / MAC CE / DCI or updated the TCI state based on the most recent (latest) PRACH transmission and updated the PCI (cell) (handover).

[0064] Note that in-cell mobility and inter-cell mobility are not limited to the multi-TRP configuration.

[0065] Layer 1 / layer 2 (L1 / L2) inter-cell mobility that facilitates more efficient (achieving lower latency and overhead) DL / UL beam management is being considered. For example, QCL / TCI-related extensions that enable inter-cell multi-TRP operations may be made assuming multi-DCI-based multi-PDSCH reception.

[0066] In L1 / L2 inter-cell mobility, without reconfiguring RRC, it is possible to change the serving cell by using functions such as beam control. In other words, it is possible to transmit and receive with a non-serving cell without handover. Since a data communication unavailable period occurs, such as the need for RRC reconnection for handover, L1 / L2 inter-cell mobility that does not require handover is preferable.

[0067] However, it may not be possible to directly use the C-RNTI used in the serving cell for transmission and reception with the non-serving cell. For example, the C-RNTI used in the serving cell may already be used for another UE in the non-serving cell. If the same C-RNTI is used among UEs in the same cell, problems may occur, such as accidentally being able to read DCI addressed to others (the cyclic redundancy check (CRC) scrambling of DCI addressed to others may be incorrectly decoded).

[0068] Therefore, the inventors conceived a method for appropriately selecting the C-RNTI. According to one aspect of the present disclosure, for example, high-speed inter-cell mobility can be realized.

[0069] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to the respective embodiments may be applied independently or in combination.

[0070] In the present disclosure, "A / B" may be read as "at least one of A and B".

[0071] In addition, in the present disclosure, panel, Uplink (UL) transmission entity, point, TRP, TRP-ID, TRP ID, spatial relationship, Control Resource SET (CORESET), PDSCH, codeword, base station, a predetermined antenna port (e.g., Demodulation Reference Signal (DMRS) port), a predetermined antenna port group (e.g., DMRS port group), a predetermined group (e.g., Code Division Multiplexing (CDM) group, a predetermined reference signal group, CORESET group), CORESET pool may be mutually interchangeable. Also, panel Identifier (ID) and panel may be mutually interchangeable.

[0072] In the present disclosure, cell, CC, carrier, BWP, band may be mutually interchangeable.

[0073] In the present disclosure, index, ID, indicator, resource ID may be mutually interchangeable.

[0074] In the present disclosure, the TCI state may be information regarding a reception beam (spatial domain reception filter) instructed (set) for the UE (e.g., DL-RS, QCL type, cell in which DL-RS is transmitted, etc.). The QCL assumption may be information regarding a reception beam (spatial domain reception filter) assumed by the UE based on the transmission or reception of an associated signal (e.g., PRACH) (e.g., DL-RS, QCL type, cell in which DL-RS is transmitted, etc.).

[0075] In the present disclosure, spatial relationship, Spatial Relation Information (SRI), spatial relation assumption, QCL parameter, spatial domain transmission filter, UE spatial domain transmission filter, spatial domain filter, UE transmission beam, UL transmission beam, UL precoding, UL precoder, RS for spatial relation, DL-RS, QCL assumption, SRI, spatial relation based on SRI, UL TCI may be read interchangeably with each other.

[0076] In the present disclosure, TRS, CSI-RS for tracking, CSI-RS having TRS information (higher layer parameter trs-Info), NZP-CSI-RS resources within the NZP-CSI-RS resource set having TRS information may be read interchangeably with each other.

[0077] In the present disclosure, beam, spatial domain filter, spatial setting, TCI, TCI state, TCI state pool, multiple TCI states, UL TCI state, unified TCI state, unified beam, common TCI state, joint TCI state, common beam, QCL assumption, QCL information, QCL parameter, spatial domain reception filter, UE spatial domain reception filter, UE reception beam, DL beam, DL reception beam, DL precoding, DL precoder, DL-RS, RS of QCL type D for TCI state / QCL assumption, RS of QCL type A for TCI state / QCL assumption, spatial relation, spatial domain transmission filter, UE spatial domain transmission filter, UE transmission beam, UL beam, UL transmission beam, UL precoding, UL precoder, PL-RS may be read interchangeably with each other. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, source of DL-RS, SSB, CSI-RS, SRS may be read interchangeably with each other.

[0078] In the present disclosure, normal TRP, single TRP, single TRP system, single TRP transmission, single PDSCH may be read interchangeably with each other. In the present disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, multi-PDSCH may be read interchangeably with each other. In the present disclosure, single DCI, single PDCCH, multi-TRP based on single DCI, activation of two TCI states on at least one TCI code point may be read interchangeably with each other.

[0079] In the present disclosure, single TRP, a channel using single TRP, a channel using one TCI state / spatial relation, non-activation of multi-TRP by RRC / DCI, non-activation of multiple TCI states / spatial relations by RRC / DCI, not setting a single CORESET pool index (CORESETPoolIndex) value for any CORESET, and not mapping any code point of the TCI field to two TCI states, communicating with one transceiver point, and applying single TRP may be read interchangeably with each other.

[0080] In the present disclosure, multi-TRP, a channel using multi-TRP, a channel using multiple TCI states / spatial relations, activation of multi-TRP by RRC / DCI, activation of multiple TCI states / spatial relations by RRC / DCI, at least one of multi-TRP based on single DCI and multi-TRP based on multi-DCI may be read interchangeably with each other. In the present disclosure, multi-TRP based on multi-DCI, setting a single CORESET pool index (CORESETPoolIndex) value for CORESET may be read interchangeably with each other. In the present disclosure, multi-TRP based on single DCI, mapping at least one code point of the TCI field to two TCI states may be read interchangeably with each other.

[0081] In the present disclosure, assumption, possession, maintenance, selection, and determination may be mutually interchangeable.

[0082] (Wireless communication method) In one embodiment of the present disclosure, the UE uses the selected C-RNTI. Using the C-RNTI, performing blind detection of the PDCCH using the C-RNTI, decoding the PDSCH using the C-RNTI, scrambling for PUCCH / PUSCH using the C-RNTI, etc. may be mutually interchangeable. This is because the C-RNTI is used for scrambling the CRC of the PDCCH (DCI), scrambling the data (information bits) of the PDSCH / PUCCH / PUSCH, etc.

[0083] The number of non-serving cells that the UE assumes (controls transmission and reception with how many non-serving cells, in other words, the number of non-serving cells that the UE can transmit and receive) may be determined in advance by the specification, may be set for the UE by upper layer signaling (e.g., RRC / MAC CE), or may be determined based on the UE capabilities.

[0084] The UE may hold / assume the C-RNTIs of the specified / set / assumed / determined number of non-serving cells in addition to the C-RNTI of the serving cell.

[0085] The UE may use the C-RNTI of the non-serving cell for transmission and reception with the non-serving cell (e.g., at least physical layer transmission and reception (detection of PDCCH, descrambling of PDSCH data, etc.)).

[0086] Note that the "C-RNTI" in the present disclosure may be replaced with any identifier (e.g., other RNTI). Also, the PCI in the present disclosure may be mutually replaced with an identifier related to the cell (e.g., cell index, serving cell index, etc.). In the present disclosure, beam indication, beam / TCI update indication, cell / serving cell / non-serving cell update indication may be mutually interchangeable.

[0087] <First Embodiment> [Aspect 1-1] The UE may assume (hold, maintain) a single C-RNTI for the TCI state / PCI associated with the serving cell and non-serving cells. When the serving cell (PCI of the serving cell) associated with the QCL source RS of the TCI state is updated by a beam indication (an indication regarding the beam / TCI update indication / serving cell update indication), the assumption of the C-RNTI is not updated. The UE assumes the single C-RNTI for UL transmission / DL reception of the channel / RS.

[0088] FIG. 6 is a diagram showing an example of the assumption of the C-RNTI in Aspect 1-1. In the example of FIG. 6, the UE assumes C-RNTI#1 for both the serving cell and non-serving cells. Even if the serving cell is updated from the cell with PCI#1 to the cell with PCI#2 by a beam indication, the assumption of the C-RNTI is not updated.

[0089] [Aspect 1-2] The UE assumes (holds, maintains) multiple C-RNTIs, and when receiving a beam indication (an indication regarding the beam / TCI update indication / serving cell update indication), when the serving cell is updated by the beam indication, one of the multiple C-RNTIs may be selected based on the beam indication. When the serving cell (PCI of the serving cell) associated with the QCL source RS of the TCI state is updated by a beam indication, the assumption of the C-RNTI is updated. The UE assumes the updated C-RNTI for UL transmission / DL reception of the channel / RS.

[0090] FIG. 7 is a diagram showing an example of the assumption of the C-RNTI in Aspect 1-2. In the example of FIG. 7, the UE assumes C-RNTI#1 for the serving cell and C-RNTI#2 for the non-serving cell. When the serving cell is updated from the cell with PCI#1 to the cell with PCI#2 by a beam indication, the assumption of the C-RNTI is updated.

[0091] <Second Embodiment> The second embodiment relates to the control of individual channels when a plurality of C-RNTIs are assumed as in Aspect 1-2.

[0092] In the present disclosure, the TCI state, unified TCI state, CORESET, SRI, and spatial relationship may be respectively read as a TCI state group, unified TCI state group, CORESET group, SRI group, and spatial relationship group.

[0093] [Aspect 2-1] C-RNTI is used for CRC scrambling of PDCCH. Therefore, it is preferable for the UE to know which C-RNTI is used for PDCCH detection before blind detection (decoding). If the UE does not know the C-RNTI used, the decoding process of PDCCH (DCI) by the UE becomes complicated.

[0094] The UE may select a C-RNTI based on the PCI used for reception of the CORESET (PDCCH). Here, the association between the C-RNTI and the serving cell index (PCI) may be preset by upper layer signaling or the like, may be reported by the UE, or may be determined / set based on the UE capabilities reported by the UE.

[0095] [[Option 1]] The UE may select (determine) the C-RNTI based on a beam indication (TCI state / CORESET corresponding to the updated serving cell) based on the Rel.15 TCI framework. The serving cell index or PCI may be set for each TCI state or CORESET. The TCI state corresponding to the CORESET may be indicated (set) by RRC / MAC CE / DCI in Rel.15 / 16. The UE may use the C-RNTI associated with the serving cell (PCI) associated with the TCI state or CORESET for blind detection. The serving cell associated with the TCI state or CORESET may be a non-serving cell.

[0096] Figure 8 is a diagram showing an example of the TCI framework of Option 1 of Aspect 2-1. In the example of Figure 8, the CORESET, TCI state, and non-serving cell index (PCI) are associated. The information shown in Figure 8 may be indicated (set) to the UE by RRC / MAC CE / DCI. When the UE monitors the PDCCH in CORESET#1 or using TCI state#1, the UE may use the C-RNTI corresponding to non-serving cell#1 (PCI#6) associated with CORESET#1 or TCI state#1 for the detection of the PDCCH. The non-serving cell may be replaced by a serving cell.

[0097] [[Option 2]] The UE may select (determine) the C-RNTI based on the beam indication (unified TCI state / CORESET corresponding to the updated serving cell) based on the unified TCI framework in Rel. 17. The serving cell index or PCI may be indicated for each unified TCI state or CORESET. The TCI state corresponding to the CORESET may be indicated by RRC / MAC CE / DCI in the unified TCI framework in Rel. 17. The UE may use the C-RNTI associated with the serving cell (PCI) associated with the unified TCI state or CORESET for blind detection. The serving cell associated with the unified TCI state or CORESET may be a non-serving cell.

[0098] Figure 9 is a diagram showing an example of the TCI framework of Option 2 of Aspects 2-1 and 2-2. In the example of Figure 9, the unified-TCI codepoint, unified TCI state, serving cell, and non-serving cell index (PCI) are associated. The information shown in Figure 9 may be indicated (configured) to the UE by RRC / MAC CE / DCI. When the UE monitors the PDCCH using the unified TCI state corresponding to the specified unified-TCI codepoint, the UE may use the C-RNTI corresponding to the serving cell / non-serving cell associated with the unified TCI state for the detection of the PDCCH.

[0099] [[Modification Example]] The serving cell index or PCI may be set for each TCI state. And a non-serving flag (x bits) may be used to save RRC overhead. For example, to indicate up to three non-serving cells, a 2-bit flag may be used to indicate any one of {serving cell, non-serving cell #1, non-serving cell #2, non-serving cell #3}. In this case, the association between the serving cell index (or PCI) and non-serving cells #1 / #2 / #3 may be preset by upper layer signaling or the like. This variation is applicable to Option 1 / Option 2.

[0100] [Aspect 2-2] The C-RNTI is used for data scrambling (initialization of PDSCH scrambling). Therefore, it is preferable for the UE to know which C-RNTI is used for PDSCH reception before receiving the PDSCH.

[0101] The UE may select the C-RNTI based on the PCI used for PDSCH reception. Here, the association between the C-RNTI and the serving cell index (PCI) may be preset by upper layer signaling or the like, may be reported by the UE, or may be determined / set based on the UE capabilities reported by the UE.

[0102] [[Option 0]] The UE may select (determine) the C-RNTI for PDSCH data scrambling based on the information (C-RNTI / serving cell / PCI) corresponding to the scheduling DCI for the PDSCH. For example, the same C-RNTI used for CRC scrambling of the scheduling DCI may also be used for the PDSCH scheduled by the DCI. The C-RNTI of the PDSCH may be different C-RNTIs selected according to whether the scheduling DCI is a serving cell or a non-serving cell (or the serving cell index / PCI corresponding to the scheduling DCI). For example, the association between the C-RNTI of the PDSCH and the serving cell index / PCI is preset by upper layer signaling or the like, and the UE may select the C-RNTI based on the association.

[0103] [[Option 1]] The UE may select (determine) the C-RNTI based on the beam indication (TCI state corresponding to the updated serving cell) based on the Rel.15 TCI framework. The serving cell index or PCI may be set for each TCI state. The TCI state of the PDSCH may be indicated (set) by RRC / MAC CE / DCI in Rel.15 / 16. For PDSCH reception, the UE may use the C-RNTI associated with the serving cell (PCI) associated with the TCI state.

[0104] FIG. 10 is a diagram showing an example of the TCI framework of Option 1 of Aspect 2-2. In the example of FIG. 10, the code point of the TCI state (TCI codepoint), the TCI state, the serving cell, and the indexes (PCI) of the non-serving cells are associated. The information shown in FIG. 10 may be indicated (set) to the UE by RRC / MAC CE / DCI. When the UE receives the PDSCH using the TCI state corresponding to the specified TCI code point, for the reception of the PDSCH, the C-RNTI corresponding to the serving cell / non-serving cell associated with the TCI state may also be used.

[0105] [[Option 2]] The UE may select (determine) the C-RNTI by means of a beam indication (unified TCI state corresponding to the updated serving cell) based on the unified TCI framework in Rel. 17. The serving cell index or PCI may be indicated for each unified TCI state. The TCI state of the PDSCH may be indicated by RRC / MAC CE / DCI of the unified TCI framework in Rel. 17. For PDSCH reception, the UE may use the C-RNTI associated with the serving cell (PCI) associated with the unified TCI state. Regarding the association between the unified TCI state and the serving cell (PCI), information similar to the example in FIG. 9 may be indicated (configured) to the UE by RRC / MAC CE.

[0106] The modification example in the above Aspect 2-1 may also be applied to each option in Aspect 2-2.

[0107] [Aspect 2-3] The C-RNTI is used for data scrambling (initialization of PUSCH scrambling). Therefore, it is preferable for the UE to know which C-RNTI is used for PUSCH reception before transmitting the PUSCH.

[0108] The UE may select the C-RNTI based on the PCI used for the transmission of the PUSCH. Here, the association between the C-RNTI and the serving cell index (PCI) may be pre-configured in the specification, reported by the UE, or determined / configured based on the UE capabilities reported by the UE.

[0109] [[Option 0]] The UE may select (determine) a C-RNTI for PUSCH data scrambling based on information (C-RNTI / serving cell / PCI) corresponding to the scheduling DCI for the PUSCH. For example, the same C-RNTI used for CRC scrambling of the scheduling DCI may also be used for the PUSCH scheduled by the DCI. The C-RNTI of the PUSCH may be different C-RNTIs depending on whether the scheduling DCI is a serving cell or a non-serving cell (or the serving cell index / PCI corresponding to the scheduling DCI). For example, the association between the C-RNTI of the PUSCH and the serving cell index / PCI may be preset by upper layer signaling or the like, and the UE may select a C-RNTI based on the association.

[0110] [[Option 1]] The UE may select (determine) a C-RNTI based on a beam indication (TCI state / SRI / spatial relation corresponding to the updated serving cell) based on the Rel.15 TCI / Sounding Reference Signal (SRS) Resource Index (SRI) framework. The serving cell index or PCI may be set for each TCI state / SRI / spatial relation. The TCI state / SRI / spatial relation of the PUSCH may be indicated (set) by RRC / MAC CE / DCI in Rel.15 / 16. For PUSCH transmission, the UE may use a C-RNTI associated with the serving cell (PCI) associated with the TCI state / SRI / spatial relation.

[0111] FIG. 11 is a diagram showing an example of the TCI framework of Option 2 of Aspect 2-3. In the example of FIG. 11, the value of the SRI field, SRI, and serving cell index (PCI) are associated. The information shown in FIG. 11 may be indicated (set) to the UE by RRC / MAC CE / DCI.

[0112] [[Option 2]] The UE may select (determine) the C-RNTI based on the beam indication (the unified TCI state corresponding to the updated serving cell) according to the unified TCI framework in Rel. 17. The serving cell index or PCI may be indicated for each unified TCI state. The TCI state of the PUSCH may be indicated (configured) by the RRC / MAC CE / DCI of the Rel. 17 unified TCI framework for both the case of the joint common TCI indication for DL / UL and the separate common TCI indication for DL / UL. For PUSCH transmission, the UE may use the C-RNTI associated with the serving cell (PCI) associated with the unified TCI state. Regarding the association between the unified TCI state and the serving cell (PCI), information similar to the example in FIG. 9 may be indicated (configured) to the UE by the RRC / MAC CE.

[0113] An example in which "for each TCI state" in the modification example of the above aspect 2-1 is replaced with "for each TCI state / SRI / spatial relationship" may be applied to each option of aspect 2-3.

[0114] According to the second embodiment, the UE can appropriately select any one of the multi-C-RNTIs for use in each of the PDCCH, PDSCH, and PUSCH.

[0115] <The Third Embodiment> The multi-C-RNTI may be set by upper layer signaling or reported by the UE via MAC CE. The association between the non-serving cell index (PCI) and the C-RNTI may be set for the UE by the RRC / MAC CE / DCI. When the association is set by the MAC CE / DCI, the RRC reconfiguration for updating the association is avoided. The C-RNTI of the serving cell may be determined according to the same rules as in Rel. 15 / 16.

[0116] FIG. 12 is a diagram showing an example of the association between a non-serving cell index and a C-RNTI. The association between the non-serving cell index (PCI) and the C-RNTI shown in FIG. 12 may be set for the UE by RRC / MAC CE / DCI. Also, the UE may report an association as shown in FIG. 12 to the network (base station) by means of a MAC CE or the like. For example, in FIG. 12, non-serving cell index #1 corresponds to PCI #245 and is associated with C-RNTI #1.

[0117] The number of non-serving cells that can be set by RRC may be restricted. The number may be, for example, 1 or 3. To change the serving cell to a cell other than the non-serving cell set by RRC, RRC reconfiguration may be performed.

[0118] When the MAC CE can update the association between the non-serving cell index set by RRC and the actual non-serving cell index / PCI / C-RNTI, RRC reconfiguration can be avoided. The "actual non-serving cell index" may mean the index of the non-serving cell that the UE can actually use. For example, the MAC CE may include at least one of the non-serving cell index set by RRC, the PCI value related to the non-serving cell index, the C-RNTI value, the RRC parameter in ServingCellConfig, etc. Alternatively, RRC may set a plurality of patterns showing the association between the actual non-serving cell index and the PCI value, C-RNTI value, RRC parameter in ServingCellConfig, etc., and the MAC CE may indicate a pattern index indicating any one of the plurality of patterns corresponding to the non-serving cell index set by RRC.

[0119] FIG. 13 is a diagram showing an example of the relationship between the actual non-serving cell index by RRC and various parameters. In the example of FIG. 13, the relationship between the non-serving cell index (or the non-serving cell flag described above), the actual non-serving cell index, PCI, and C-RNTI is shown. For example, a setting as shown in FIG. 13 may be transmitted to the UE by RRC, and the actual non-serving cell index, PCI, and C-RNTI may be updated by MAC CE.

[0120] FIG. 14 is a diagram showing an example of re-indexing of the index of the ID of the non-serving cell. By RRC, an association between the re-indexed non-serving cell index (Re-indexing ID) and the PCI value as shown in FIG. 14 may be set in the UE. For example, MAC CE may update the re-created index instead of the non-serving cell index and PCI in FIG. 13. By using the re-created index, the number of information bits can be reduced, and the overhead of RRC signaling can be reduced.

[0121] FIG. 15 is a diagram showing an example of cell-to-cell movement of the UE. In the example of FIG. 15, the UE moves sequentially from the serving cell to a plurality of non-serving cells (seven non-serving cells). For example, when the number of RRC-configurable non-serving cells is 3, a Rel. 15 handover is required. However, the UE can reduce the handover by updating the non-serving cell information by MAC CE.

[0122] <The Fourth Embodiment> When at least some of the RRC parameters (configurations) of the serving cell and the non-serving cell are different, the UE needs to maintain two sets of configurations and apply different sets of configurations to the PDCCH / PDSCH from different cells. In this case, there is a problem that the complexity of UE operation increases. FIG. 16 is a diagram showing an example of RRC parameters of the serving cell and the non-serving cell. In the example of FIG. 16, the RRC parameters (ServingCellConfig#1) of the serving cell and the RRC parameters (ServingCellConfig#2) of the non-serving cell are different. In the present disclosure, although the case where the RRC parameters of the non-serving cell are also set with the RRC information element called ServingCellConfig is described, it is not limited thereto, and the RRC parameters of the non-serving cell may be set using a configuration for the non-serving cell (for example, an information element called NonServingCellConfig).

[0123] To solve the above problem, the UE may report (transmit) UE capability (UE capability information) indicating that it supports dynamically updating (changing) at least some of the RRC parameters (configurations) between the serving cell and the non-serving cell (for example, when switching from the serving cell to the non-serving cell or vice versa (when updating the TCI state / beam)). Then, when the cell switches, the UE may use the RRC parameters for the switched cell. The UE determines whether to hold different C-RNTIs between the serving cell and the non-serving cell according to whether it has transmitted the UE capability information.

[0124] If the UE does not support the UE capabilities (when it reports non - support), the UE may not assume that different RRC parameters (for example, at least a part of the parameters of ServingCellConfig) are set in the serving cell and the non - serving cell. If the UE does not support the UE capabilities (when it reports non - support), the UE may not assume that it holds different C - RNTIs in the serving cell and the non - serving cell. When the UE supports the UE capabilities (when it reports support), the UE may hold / assume / select different C - RNTIs in the serving cell and the non - serving cell.

[0125] The processing of the fourth embodiment may be applied, for example, in combination with mode 1 - 1 or mode 1 - 2 of the first embodiment.

[0126] <Fifth Embodiment> When the serving cell associated with the QCL source RS in the TCI state is updated (to another cell) by a beam indication, the UE may assume / judge / select a C - RNTI based on whether the "serving cell" in the existing specification is updated. This C - RNTI is the single C - RNTI (mode 1 - 1) or multi - C - RNTI (mode 1 - 2) of the first embodiment.

[0127] [Mode 5 - 1] When the UE receives a beam indication (an indication regarding a non - serving cell) associated with the QCL source RS in the TCI state, the UE may determine that the serving cell is not updated to the non - serving cell.

[0128] The "serving cell" is not updated in L1 / L2 inter - cell mobility, and the definition of the existing specification may be reused. In other words, the "serving cell" may correspond to a special cell (primary cell, primary - secondary cell) and a secondary cell. The "serving cell" may correspond to a cell in which RRC parameters are set by the ServingCellConfig information element.

[0129] In aspect 5-1, the difference between the serving cell and the non-serving cell lies in which of the serving cell and the non-serving cell the QCL source RS corresponding to the TCI state / SRI / spatial relationship is associated with.

[0130] In aspect 5-1, for example, even when the UE receives a beam indication as shown in FIG. 16, the serving cell is not updated (not updated from PCI#1).

[0131] In aspect 5-1, both the single C-RNTI (aspect 1-1) and the multi C-RNTI (aspect 1-2) of the first embodiment are applicable. The application of the single C-RNTI may mean that the C-RNTI of the serving cell is always used for UL transmission / DL reception of UE-specific channels / RSs regardless of the QCL source associated with the serving cell or the non-serving cell.

[0132] When the serving cell is not updated, CORESET#0 / UE group common CORESET is set to have (or be related to) the TCI state corresponding to the serving cell only, and only the UE-specific CORESET and the UE-specific PDSCH may be set to have (or be related to) the TCI state corresponding to the non-serving cell.

[0133] Different RRC parameters (at least part of ServingCellConfig) / different C-RNTIs may be used according to the CORESET associated with UL transmission / DL reception. For example, the PDSCH is scheduled by DCI received by the common CORESET or the UE-specific CORESET. For example, the RRC parameters and C-RNTI used for UL transmission / DL reception may be determined based on at least one of the following (1) and (2).

[0134] (1) When the CORESET#0 / UE group common CORESET (search space) is associated with UL transmission / DL reception, at least one of the RRC parameters for the serving cell (at least part of ServingCellConfig) and the C-RNTI for the serving cell is used.

[0135] (2) When another CORESET / UE-specific CORESET (search space) is associated with UL transmission / DL reception, at least one of the RRC parameters for the non-serving cell (at least part of ServingCellConfig) and the C-RNTI for the non-serving cell is used.

[0136] [Aspect 5-2] When the UE receives a beam indication (an indication regarding a non-serving cell) associated with the QCL source RS of the TCI state, the UE may determine that the serving cell is updated to the non-serving cell.

[0137] The "serving cell" may be updated in L1 / L2 cell mobility. When the serving cell associated with the QCL source RS of the TCI state / SRI / spatial relation is updated by a beam indication, the assumption of the "serving cell" may be updated. In this case, according to the assumption of the "serving cell", the used RRC configuration (at least part of ServingCellConfig) and C-RNTI may be updated. To avoid RRC reconfiguration, a multi-set of updated RRC parameters (at least part of ServingCellConfig) / C-RNTI is preset as described in the fourth embodiment, and the UE may select one of the RRC parameters / C-RNTI according to the beam indication.

[0138] In Aspect 5-2, both the single C-RNTI (Aspect 1-1) and the multi C-RNTI (Aspect 1-2) of the first embodiment are applicable. When a single C-RNTI is applied, the UE has one C-RNTI, which is updated by the RRC reconfiguration / random access procedure in L1 / L2 inter-cell mobility. When a multi C-RNTI is applied, the UE may hold / maintain a plurality of C-RNTIs and select any C-RNTI in response to a beam indication.

[0139] In Aspect 5-2, for example, when the UE receives a beam indication as shown in FIG. 16, the serving cell is updated (updated from PCI#1 to PCI#2).

[0140] When the serving cell can be updated, CORESET#0 / UE group common CORESET may be set to have (or be related to) the TCI state corresponding to the non-serving cell.

[0141] The same RRC parameters (at least part of ServingCellConfig) / the same C-RNTI may be used regardless of the CORESET associated with UL transmission / DL reception. For example, PDSCH is scheduled by DCI received in the common CORESET or UE-specific CORESET. For example, the RRC parameters and C-RNTI used for UL transmission / DL reception may be determined based on at least one of the following (1) and (2).

[0142] (1) When CORESET#0 / UE group common CORESET (search space) is associated with UL transmission / DL reception, at least one of the RRC parameters (at least part of ServingCellConfig) for the serving cell and the C-RNTI for the serving cell is used.

[0143] (2) If another CORESET / UE-specific CORESET (search space) is associated with UL transmission / DL reception, at least one of the RRC parameters for the serving cell (at least part of ServingCellConfig) and the C-RNTI for the serving cell is used.

[0144] According to the fifth embodiment, the UE can appropriately select / assume a C-RNTI whether or not the serving cell is updated.

[0145] <Sixth Embodiment> For example, any combination of the following Case A and Case B (for example, combinations of A1 and B1, A1 and B2, A2 and B1, A2 and B2) may be allowed. Also, in all examples of Case A and Case B, both the single C-RNTI (Aspect 1-1) and the multi-C-RNTI (Aspect 1-2) of the first embodiment are applicable.

[0146] [Case A] (A1) The "serving cell" is updated when the UE performs UL transmission / DL reception of a channel / RS for a non-serving cell (that is, when the QCL source RS of the UL transmission / DL reception of the channel / RS is associated with a non-serving cell). In this case, the complexity of the UE is reduced, and there is an advantage that the UE does not need to receive a DL signal from the "non-serving cell".

[0147] (A2) The "serving cell" is not updated when the UE performs UL transmission / DL reception of a channel / RS for a non-serving cell (that is, when the QCL source RS of the UL transmission / DL reception of the channel / RS is associated with a non-serving cell). In this case, there is an advantage that the impact on the specification is small, the operation of Rel.15 can be maintained, and the impact on the UE implementation is low.

[0148] [Case B] (B1) The cell configurations of the serving cell and the non-serving cell may be substantially the same (or exactly the same). As a result, the RRC overhead is small, and since the RRC parameter (ServingCellConfig) of the cell configuration possessed by the UE becomes one (common to the serving cell and the non-serving cell), there is an advantage that the complexity of the UE is low.

[0149] (B2) A set of different cell configurations may be permitted for the serving cell and the non-serving cell. The UE may have different settings in at least a part of the RRC parameter (ServingCellConfig). In this case, there is an advantage that flexible network (NW) operation is possible and the performance is improved.

[0150] <UE capability> Each of the above embodiments / aspects may be applied only when at least one of the corresponding UE capability (UE capability information) is reported (transmitted) and the corresponding parameter is set by a higher layer. The UE may report at least one of the following (1) to (7) as the UE capability, and a setting corresponding to the report may be made.

[0151] (1) Whether the UE supports the function of L1 / L2 inter-cell mobility. (2) In L1 / L2 inter-cell mobility, the number of TCI states corresponding to the non-serving cell for each Component Carrier (CC) (or for all CCs, or for all CCs of each band) that can be set by RRC (or the total number of TCI states corresponding to the serving cell and the non-serving cell). Note that the number of TCI states set by RRC may be related to the memory capacity of the UE. (3) In L1 / L2 inter-cell mobility, the number of TCI states corresponding to non-serving cells (or the total number of TCI states corresponding to serving cells and non-serving cells), for each CC (or all CCs, or all CCs for each band), that can be activated by MAC CE. Note that the number of TCI states that can be activated may be related to the processing capability of the UE. (4) In L1 / L2 inter-cell mobility, the number of non-serving cells (number of different PCIs) for each CC (or all CCs, or all CCs for each band) that the UE can support. Also, the number of C-RNTIs that the UE can support in L1 / L2 inter-cell mobility. (5) Whether to support the update / change of the "serving cell" in L1 / L2 inter-cell mobility (corresponding to the fifth embodiment). (6) Whether to support different RRC parameters (at least a part of ServingCellConfig) in serving cells and non-serving cells. (7) Whether dynamic change of the serving cell at the DCI level is supported. If the UE does not support dynamic change at the DCI level, the UE may support only dynamic change at the MAC CE level of the serving cell (slower than DCI). Here, the change of the serving cell means only the change of the assumption of the serving cell (e.g., mode 5-2) or the change of the QCL source RS related to the serving cell (as in mode 5-1).

[0152] (Wireless communication system) Hereinafter, the configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present disclosure.

[0153] FIG. 17 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), etc. standardized by the Third Generation Partnership Project (3GPP).

[0154] Further, the wireless communication system 1 may support dual connectivity (multi-RAT dual connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0155] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0156] The wireless communication system 1 may support dual connectivity between a plurality of base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both the MN and the SN are base stations (gNBs) of NR).

[0157] The wireless communication system 1 may include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and the user terminal 20 are not limited to the modes shown in the figures. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0158] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).

[0159] 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, or the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub - 6 GHz), and FR2 may be a frequency band higher than 24 GHz (above - 24 GHz). Note that the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0160] Also, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0161] The plurality of base stations 10 may be connected by wire (e.g., an optical fiber compliant with Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the upper-level 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.

[0162] The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one of, for example, Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0163] The user terminal 20 may be a terminal corresponding to at least one of communication systems such as LTE, LTE-A, 5G, etc.

[0164] In the wireless communication system 1, an orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM))-based wireless access method may be used. For example, in at least one of the downlink (Downlink (DL)) and the uplink (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.

[0165] The wireless access method may also be referred to as a waveform. In the wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0166] In the wireless communication system 1, as a downlink channel, a Physical Downlink Shared Channel (PDSCH) shared by each user terminal 20, a Physical Broadcast Channel (PBCH), a Physical Downlink Control Channel (PDCCH), etc. may be used.

[0167] Also, in the wireless communication system 1, as an uplink channel, a Physical Uplink Shared Channel (PUSCH) shared by each user terminal 20, a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), etc. may be used.

[0168] User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH. User data, upper layer control information, etc. may be transmitted by the PUSCH. Also, the Master Information Block (MIB) may be transmitted by the PBCH.

[0169] 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 for at least one of the PDSCH and the PUSCH.

[0170] Note that the DCI for scheduling the PDSCH may be referred to as DL assignment, DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as UL grant, UL DCI, etc. Note that the PDSCH may be read as DL data, and the PUSCH may be read as UL data.

[0171] For the detection of PDCCH, a control resource set (COntrol REsource SET (CORESET)) and a search space may be used. The CORESET corresponds to the resource for searching for DCI. The search space corresponds to the search area and search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0172] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. in the present disclosure may be read as each other.

[0173] Through the PUCCH, uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (e.g., which may be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) may be transmitted. Through the PRACH, a random access preamble for connection establishment with a cell may be transmitted.

[0174] Note that in the present disclosure, downlink, uplink, etc. may be expressed without attaching "link". Also, the beginning of various channels may be expressed without attaching "Physical".

[0175] 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.

[0176] 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 SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), etc. Note that SS, SSB, etc. may also be referred to as reference signals.

[0177] Also, in the wireless communication system 1, as an uplink reference signal (UL-RS), a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted. Note that DMRS may also be referred to as a UE-specific reference signal.

[0178] (Base station) FIG. 18 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 the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0179] In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0180] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0181] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission, reception, measurement, etc. using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data, control information, a sequence, etc. to be transmitted as signals and transfer them to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0182] The transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmission / reception unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0183] The transmission / reception unit 120 may be configured as an integrated transmission / reception unit or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of the transmission processing unit 1211 and the RF unit 122. The reception unit may be composed of the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0184] The transmission / reception antenna 130 may be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0185] The transmission / reception unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 120 may receive the above-described uplink channel, uplink reference signal, etc.

[0186] The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0187] The transmission / reception unit 120 (transmission processing unit 1211) may perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on, for example, data, control information, etc. acquired from the control unit 110, and generate a bit string to be transmitted.

[0188] The transmission / reception unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0189] The transmission / reception unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0190] On the other hand, the transmission / reception unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmission / reception antenna 130.

[0191] The transmission / reception unit 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and may acquire user data and the like.

[0192] The transmission / reception unit 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), 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.

[0193] The transmission path interface 140 may transmit and receive signals (backhaul signaling) with devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0194] Note that the transmission unit and reception unit of the base station 10 in the present disclosure may be configured by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0195] Note that the transceiver unit 120 may transmit an instruction regarding the beam. When the serving cell is updated according to the instruction, the transceiver unit 120 may receive an uplink signal using one of a plurality of Cell Radio Network Temporary Identifiers (C-RNTIs) selected based on the instruction.

[0196] The transceiver unit 120 may receive capability information indicating that it supports updating at least some of the Radio Resource Control (RRC) parameters between the serving cell and the non-serving cell.

[0197] When transmitting the capability information, the control unit 110 may assume different Cell Radio Network Temporary Identifiers (C-RNTIs) for the serving cell and the non-serving cell.

[0198] (User Equipment) FIG. 19 is a diagram showing an example of the configuration of a user equipment according to an embodiment. The user equipment 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that one or more of the control unit 210, the transceiver unit 220, and the transceiver antenna 230 may be provided.

[0199] In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it may be assumed that the user equipment 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0200] The control unit 210 controls the entire user equipment 20. The control unit 210 can be composed of a controller, a control circuit, etc. described based on the common understanding in the technical field related to the present disclosure.

[0201] The control unit 210 may control the generation, mapping, etc. of signals. The control unit 210 may control transmission, reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0202] The transceiver 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 transceiver unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0203] The transceiver unit 220 may be configured as an integrated transceiver unit or may be composed of a transmitter unit and a receiver unit. The transmitter unit may be composed of the transmission processing unit 2211 and the RF unit 222. The receiver unit may be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0204] The transceiver antenna 230 may be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0205] The transceiver unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0206] The transceiver unit 220 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0207] The transmission / reception unit 220 (transmission processing unit 2211) may perform processing of the PDCP layer, RLC layer (e.g., RLC retransmission control), MAC layer (e.g., HARQ retransmission control), etc. on, for example, data and control information acquired from the control unit 210, and generate a bit string to be transmitted.

[0208] The transmission / reception unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0209] Note that whether to apply DFT processing may be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is enabled, the transmission / reception unit 220 (transmission processing unit 2211) may perform DFT processing as the above transmission processing to transmit the channel using the DFT-s-OFDM waveform; otherwise, it may not perform DFT processing as the above transmission processing.

[0210] The transmission / reception unit 220 (RF unit 222) may perform modulation to the radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0211] On the other hand, the transmission / reception unit 220 (RF unit 222) may perform amplification, filtering, demodulation to the baseband signal, etc. on the radio frequency band signal received by the transmission / reception antenna 230.

[0212] The transmission / reception unit 220 (reception processing unit 2212) may perform 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 on the acquired baseband signal, and may acquire user data and the like.

[0213] The transmission / reception unit 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), reception 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.

[0214] Note that the transmission unit and reception unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0215] Note that the transmission / reception unit 220 may receive an instruction regarding the beam.

[0216] When the serving cell is updated according to the instruction regarding the beam, the control unit 210 may select one C-RNTI from among a plurality of cell radio network temporary identifiers (Cell Radio Network Temporary Identifier (C-RNTI)) based on the instruction. The control unit 210 may select the one C-RNTI based on a transmission configuration indication state (Transmission Configuration Indication state (TCI state)) or a unified TCI state corresponding to the updated serving cell.

[0217] The control unit 210 may select the one C-RNTI used for scrambling the physical downlink shared channel or the physical uplink shared channel based on information corresponding to the downlink control information that schedules the physical downlink shared channel or the physical uplink shared channel.

[0218] The transceiver unit 220 may transmit capability information indicating that it supports updating at least some of the Radio Resource Control (RRC) parameters between the serving cell and the non-serving cell.

[0219] When transmitting the capability information, the control unit 210 may assume different Cell Radio Network Temporary Identifiers (C-RNTIs) for the serving cell and the non-serving cell.

[0220] When receiving an indication regarding a non-serving cell associated with the quasi-collocation source reference signal (QCL source RS) in the Transmission Configuration Indication state (TCI state), the control unit 210 may determine that the serving cell is not updated (or is updated) to the non-serving cell.

[0221] (Hardware Configuration) Note that the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0222] Here, functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication (communicating), forwarding, configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), etc. For example, a functional block (component) that functions to transmit may be referred to as a transmitting unit, a transmitter, etc. In any case, as described above, the realization method is not particularly limited.

[0223] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 20 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may 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.

[0224] In the present disclosure, terms such as apparatus, circuit, device, section, unit, etc. can be read interchangeably with each other. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0225] For example, although only one processor 1001 is illustrated, there may be a plurality of processors. Also, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

[0226] Each function in the base station 10 and the user terminal 20 is realized, for example, by causing a predetermined software (program) to be loaded onto hardware such as the processor 1001 and the memory 1002, and the processor 1001 performs calculations, controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003.

[0227] The processor 1001 controls the entire computer by operating, for example, an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-described control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0228] Also, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 110(210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and the same may be true for other functional blocks.

[0229] The memory 1002 is a computer-readable recording medium, and may be constituted by, for example, at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other appropriate storage media. The memory 1002 may be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0230] The storage 1003 is a computer-readable recording medium, and may be constituted by, for example, at least one of a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may be referred to as an auxiliary storage device.

[0231] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-described transceiver unit 120 (220), the transceiver antenna 130 (230), etc. may be implemented by the communication device 1004. The transceiver unit 120 (220) may be physically or logically separated and implemented by a transmission unit 120a (220a) and a reception unit 120b (220b).

[0232] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (e.g., a touch panel).

[0233]

[0234] In addition, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA), and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0235] (Modification example) In addition, terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be read interchangeably with each other. Also, a signal may be a message. A reference signal may also be abbreviated as RS and may be called a Pilot, a pilot signal, etc. depending on the applicable standard. Also, a Component Carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, etc.

[0236] The radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be called a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) independent of numerology.

[0237] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering process performed by a transceiver in the frequency domain, specific windowing process performed by a transceiver in the time domain, etc.

[0238] A slot may be composed of one or more symbols (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Also, a slot may be a time unit based on numerology.

[0239] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot may be called PDSCH (PUSCH) mapping type B.

[0240] A radio frame, sub-frame, slot, mini-slot, and symbol all represent time units for signal transmission. Different names may be used for the radio frame, sub-frame, slot, mini-slot, and symbol respectively. Note that the time units such as frame, sub-frame, slot, mini-slot, and symbol in this disclosure may be read interchangeably with each other.

[0241] For example, 1 sub-frame may be called a TTI, or a plurality of consecutive sub-frames may be called a TTI, or 1 slot or 1 mini-slot may be called a TTI. That is, at least one of the sub-frame and TTI may be the sub-frame (1 ms) in the existing LTE, or 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, mini-slot, etc. instead of a sub-frame.

[0242] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used at each user terminal) to each user terminal in TTI units. Note that the definition of the TTI is not limited to this.

[0243] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), code block, codeword, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when the TTI is given, the time interval (for example, the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0244] In addition, when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (number of mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0245] A TTI having a time length of 1 ms may be referred to as 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 referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0246] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of a long TTI and not less than 1 ms.

[0247] A resource block (Resource Block (RB)) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0248] Also, an RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be constituted by one or a plurality of resource blocks.

[0249] Note that one or more RBs may be referred to as a Physical Resource Block (PRB), a Sub-Carrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, etc.

[0250] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource area of 1 sub-carrier and 1 symbol.

[0251] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0252] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured within one carrier for a UE.

[0253] At least one of the configured BWPs may be active, and it may not be assumed that the UE transmits and receives a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0254] Note that the structures such as the above-described radio frame, subframe, slot, minislot, and symbol 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, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be variously changed.

[0255] Also, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or using corresponding other information. For example, a radio resource may be indicated by a predetermined index.

[0256] The names used for parameters, etc. in the present disclosure are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0257] The information, signals, etc. described in the present disclosure may be represented using any of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0258] Also, information, signals, etc. may be output from at least one of the upper layer to the lower layer and from the lower layer to the upper layer. Information, signals, etc. may be input and output via a plurality of network nodes.

[0259] The input / output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. The information, signals, etc. to be input / output may be overwritten, updated, or appended. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

[0260] 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 implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0261] Note that the physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Also, the RRC signaling may also be referred to as an RRC message and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. Further, the MAC signaling may be notified, for example, using a MAC Control Element (CE).

[0262] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to an explicit notification and may be performed implicitly (e.g., by not performing the notification of the predetermined information or by the notification of another piece of information).

[0263] The determination may be made based on a value represented by 1 bit (either 0 or 1), a boolean value represented by true or false, or a numerical comparison (e.g., comparison with a predetermined value).

[0264] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0265] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0266] The terms "system" and "network" used in the present disclosure may be used interchangeably. "Network" may mean the devices (e.g., base stations) included in the network.

[0267] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. may be used interchangeably.

[0268] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. The base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0269] 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 divided into multiple smaller areas, and each of the smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of a base station and a base station subsystem that provides communication services in this coverage.

[0270] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0271] A mobile station may also be called 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 appropriate term.

[0272] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves without a driver (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0273] In addition, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which the communication between the base station and the user terminal is replaced by communication between a plurality of user terminals (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured as functions of the user terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to inter-terminal communication (for example, "sidelink"). For example, the uplink channel, the downlink channel, etc. may be replaced with the sidelink channel.

[0274] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal 20 may be configured as functions of the base station 10.

[0275] In the present disclosure, operations assumed to be performed by the base station may, in some cases, be performed by its upper node. In a network including one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME), Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

[0276] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0277] Each aspect / embodiment described in the present disclosure may be applicable to systems using Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (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 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable wireless communication methods, and next-generation systems extended based on these. Further, a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G) may be applicable.

[0278] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0279] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These terms can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed or that the first element must precede the second element in any form.

[0280] The term "determining" as used in this disclosure may encompass a wide variety of operations. For example, "determining" may be considered to be "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up, search, inquiry" (e.g., searching in a table, database, or another data structure), "ascertaining", etc.

[0281] Also, "determining" may be considered to be "receiving" (e.g., receiving information), "transmitting" (e.g., transmitting information), "input", "output", "accessing" (e.g., accessing data in a memory), etc.

[0282] Also, "determining" may be considered to be "resolving", "selecting", "choosing", "establishing", "comparing", etc. That is, "determining" may be considered to be "determining" any operation.

[0283] Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

[0284] As used in this disclosure, the terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed".

[0285] In this disclosure, when two elements are connected, they can be considered to be "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, light (both visible and invisible) region, etc.

[0286] In this disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted in the same way as "different".

[0287] In this disclosure, when the terms "include", "including", and their variations are used, these terms are intended to be inclusive in the same way as the term "comprising". Further, the term "or" used in this disclosure is not intended to be an exclusive disjunction.

[0288] In the present disclosure, for example, when articles are added by translation, such as a, an, and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0289] As described above, the invention according to the present disclosure has been described in detail. However, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not impose any restrictive meaning on the invention according to the present disclosure.

Claims

1. a receiving unit that receives an update instruction for updating a serving cell from a first cell to a second cell; a control unit that, when the serving cell is updated according to the update instruction, selects one Cell Radio Network Temporary Identifier (C-RNTI) from among a plurality of C-RNTIs based on the update instruction; A terminal having the above.

2. The control unit selects the one C-RNTI based on a Transmission Configuration Indication state (TCI state) corresponding to the updated serving cell. The terminal according to Claim 1.

3. The control unit selects the one C-RNTI based on a unified Transmission Configuration Indication state (TCI state) corresponding to the updated serving cell. The terminal according to Claim 1.

4. Before the update of the serving cell, the second cell is a non-serving cell, and the association between the physical cell ID (PCI) of the non-serving cell and the one C-RNTI is set by Radio Resource Control (RRC). The terminal according to Claim 1.

5. a step of receiving an update instruction for updating a serving cell from a first cell to a second cell; a step of, when the serving cell is updated according to the update instruction, selecting one C-RNTI from among a plurality of C-RNTs based on the update instruction; A wireless communication method for a terminal having the above.

6. a transmitting unit that transmits an update instruction for updating a serving cell from a first cell to a second cell; a receiving unit that receives an uplink signal using one C-RNTI selected from among a plurality of Cell Radio Network Temporary Identifiers (C-RNTIs) based on the update instruction when the serving cell is updated according to the update instruction; A base station having the above.

7. A system including a terminal and a base station, wherein the base station is A transmitting unit that transmits an update instruction for updating a serving cell from a first cell to a second cell, wherein the terminal, a receiving unit that receives the update instruction, and a control unit that, when the serving cell is updated according to the update instruction, selects one C-RNTI from among a plurality of cell radio network temporary identifiers (Cell Radio Network Temporary Identifier (C-RNTI)) based on the update instruction. System.

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