Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit that receives at least one of downlink control information including cell handover instruction information from a serving cell to a candidate cell and a MAC Control Element (MAC Control Element); and a control unit that controls a cell handover operation on the basis of the cell handover instruction information, at least one of the serving cell and the candidate cell being set to at least one of an intra-cell multi-transmit / receive point and an inter-cell multi-transmit / receive point.

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

[0003] Successor systems of LTE (also called, for example, fifth generation mobile communication system (5G), 5G+(plus), sixth generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (for example, wireless communication systems after Rel.16 / 5G), it is envisaged that communications will be controlled based on inter-cell mobility including non-serving cells, or inter-cell mobility utilizing multiple transmitting and receiving points (for example, Multi-TRP (MTRP)).

[0009] However, when inter-cell mobility is applied, how to control UL transmission (for example, control of timing advance, cell switching, etc.) becomes a problem. If inter-cell mobility cannot be appropriately performed, there is a concern that the quality of communication may deteriorate.

[0010] The present disclosure has been made in view of this aspect, and one of its objectives is to provide a terminal, a wireless communication method, and a base station that can appropriately control communication even when inter-cell mobility is performed.

[0011] Means for solving problems

[0012] A terminal involved in one method of the present disclosure comprises: a receiving unit, which receives downlink control information including cell switching indication information from a serving cell to a candidate cell and at least one MAC CE (MAC Control Element); and a control unit, which controls the cell switching operation based on the cell switching indication information, and at least one of the serving cell and the candidate cell is set with at least one of multiple sending and receiving points within the cell and multiple sending and receiving points between cells.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, communication can be appropriately controlled even when inter-cell mobility is performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A as well as Figure 1B This is a diagram showing an example of inter-cell mobility.

[0016] Figure 2 This is a diagram showing an example of switching between a serving cell and an additional cell based on L1 / L2 signaling.

[0017] Figure 3 This is a diagram showing an example of setting example 1-3 when supporting candidate cells.

[0018] Figure 4A-4C This is a diagram showing an example of a situation where switching of candidate cells / candidate cell groups based on L1 / L2 signaling is performed in setting example 1-3 in the case of supporting candidate cells.

[0019] Figure 5 This is a diagram showing an example of a timing advance group (TAG) to which cells included in a cell group belong.

[0020] Figure 6 This is a diagram showing an example of a MAC CE for a timing advance command.

[0021] Fig. 7A as well as Figure 7B This is a diagram showing an example of TAG IDs set in a serving cell and a candidate cell.

[0022] Figure 8 This is a diagram showing an example of a case where L1 / L2 inter-cell mobility according to the first embodiment is successful.

[0023] Fig. 9 This is a diagram showing another example of a case where L1 / L2 inter-cell mobility according to the first embodiment is successful.

[0024] Fig.10 This is a diagram showing an example of a situation where L1 / L2 inter-cell mobility fails according to the first embodiment.

[0025] Fig.11 This is a diagram showing another example of a case where L1 / L2 inter-cell mobility fails according to the first embodiment.

[0026] Fig. 12A as well as Fig. 12B This is a diagram showing an example of application of L1 / L2 inter-cell mobility and L3 mobility involved in the second embodiment.

[0027] Fig.13A as well as Fig. 13B This is a diagram showing another example of application of L1 / L2 inter-cell mobility and L3 mobility involved in the second embodiment.

[0028] Fig.14 This is a diagram showing an example of activation of TCI states corresponding to a serving cell and a candidate cell that are set to the same frequency.

[0029] Fig.15 This is a diagram showing an example of activation of the TCI status of the serving cell and the candidate cell involved in the third embodiment.

[0030] Fig.16 This is a diagram showing an example of inter-frequency cell switching according to the third embodiment.

[0031] Fig.17 This is a diagram showing another example of activation of the TCI status of the serving cell and the candidate cell involved in the third embodiment.

[0032] Fig.18 This is a diagram showing another example of activation of the TCI status of the serving cell and the candidate cell involved in the third embodiment.

[0033] Fig.19 This is a diagram showing another example of activation of the TCI status of the serving cell and the candidate cell involved in the third embodiment.

[0034] Fig. 20 This is a diagram for explaining setting example #1 according to the third embodiment.

[0035] Fig.21 This is a diagram for explaining setting example #2 according to the third embodiment.

[0036] Fig. 22 It is a diagram showing an example of the setting of intra-cell multi-TRP and inter-cell multi-TRP corresponding to the service cell / candidate cell involved in the fourth embodiment.

[0037] Fig.23 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0038] Fig.24 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0039] Fig.25 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0040] Fig.26 This is a diagram showing an example of the hardware configuration of a base station and a user terminal involved in one embodiment.

[0041] Fig. 27 It is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0042] (TCI, spatial relationship, QCL)

[0043] In NR, research is being conducted on: reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) of a control signal and at least one of a channel (expressed as signal / channel) in the UE based on the Transmission Configuration Indication state (TCI state).

[0044] The TCI state may also represent the TCI state applied to the downlink signal / channel. The TCI state equivalent to the TCI state applied to the uplink signal / channel may also be expressed as a spatial relation.

[0045] The so-called TCI state refers to information related to Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relationship information, etc. The TCI state may also be set for each channel or each signal to the UE.

[0046] QCL refers to an index that indicates the statistical properties of a signal / channel. For example, when a certain signal / channel is in a QCL relationship with other signals / channels, it can also mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same among these different signals / channels (at least one of them is QCL).

[0047] In addition, the spatial reception parameter may also correspond to a reception beam of the UE (eg, a reception analog beam), and the beam may also be determined based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may also be rewritten as sQCL (spatial QCL).

[0048] QCL can also be specified in multiple types (QCL types). For example, it is also possible to set four different QCL types, namely types AD, which can assume the same parameters (or parameter sets). The following represents the parameters (which may also be referred to as QCL parameters):

[0049] ・QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0050] ・QCL type B (QCL-B): Doppler shift and Doppler spread,

[0051] ・QCL type C (QCL-C): Doppler shift and average delay,

[0052] ・QCL type D (QCL-D): Spatial reception parameters.

[0053] The UE assumes that a certain Control Resource Set (CORESET), channel or reference signal is in a specific QCL (e.g., QCL type D) relationship with other CORESETs, channels or reference signals, which can also be called QCL assumption.

[0054] The UE may also determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0055] The TCI state may be, for example, information related to the QCL of the target channel (in other words, the reference signal (RS) used for the channel) and other signals (for example, other RS). The TCI state may also be set (indicated) by high-layer signaling, physical layer signaling, or a combination thereof.

[0056] In the present disclosure, the higher 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.

[0057] MAC signaling may use, for example, MAC Control Element (MAC CE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also include, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0058] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)).

[0059] In addition, the channel / signal that becomes the application object of the TCI state can also be called the target channel / reference signal (target channel / RS), or simply referred to as the target, etc., and the other signals mentioned above can also be called the reference reference signal (reference RS), the source RS (source RS), or simply referred to as the reference, etc.

[0060] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of the downlink shared channel (Physical Downlink Shared Channel (PDSCH)), the downlink control channel (Physical Downlink Control Channel (PDCCH)), the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and the uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0061] In addition, the RS that is in a QCL relationship with the channel may be, for example, a synchronization signal block (SynchronizationSignal Block (SSB)), a channel state information reference signal (CSI-RS), a measurement reference signal (Sounding Reference Signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS))), a QCL detection reference signal (also called QRS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), etc., at least one of the following.

[0062] The SSB is a signal block including at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel (physical broadcast channel (PBCH)). The SSB may also be referred to as an SS / PBCH block.

[0063] The RS of QCL type X in the TCI state may also mean an RS that is in a QCL type X relationship with (a DMRS of) a certain channel / signal, and the RS may also be referred to as a QCL source of QCL type X in the TCI state.

[0064] (Inter-cell mobility)

[0065] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (Multi-TRP (MTRP)) are being studied for DL ​​transmission to the UE. In addition, the UE is studying to perform UL transmission to one or more TRPs.

[0066] Consider that a UE receives channels / signals from multiple cells / TRPs in inter-cell mobility (e.g., L1 / L2 inter-cell mobility) (see Figure 1A , B).

[0067] Figure 1A An example of inter-cell mobility including non-serving cells (e.g., Single-TRP inter-cell mobility) is shown. The UE may also be set with one TRP (or, a single TRP) in each cell. Here, a situation is shown where the UE receives channels / signals from the base station / TRP of cell #1, which is a serving cell, and the base station / TRP of cell #3, which is not a serving cell (a non-serving cell). For example, this is equivalent to a situation where the UE switches from cell #1 to cell #3 (e.g., fast cell switch).

[0068] In this case, the selection of the port (e.g., antenna port) / TRP may also be performed dynamically. The selection of the port (e.g., antenna port) / TRP may also be performed based on the TCI state indicated or updated by the DCI / MAC CE. Here, it is shown that different physical cell IDs (e.g., PCIs) are supported for cell #1 and cell #3.

[0069] Figure 1BAn example of a multi-TRP scenario (e.g., inter-cell mobility using multiple TRPs (Multi-TRP inter-cell mobility)) is shown. Multiple (e.g., 2) TRPs (or, different CORESET pool indexes) may be set for the UE in each cell. Here, a situation is shown where the UE receives channels / signals from TRP#1 and TRP2. In addition, here, a situation is shown where TRP#1 corresponds to physical cell ID (PCI) #1 and TRP#2 corresponds to PCI#2.

[0070] Multiple TRPs (TRP#1, #2) can also be connected through ideal / non-ideal backhaul to exchange information, data, etc. The same or different code words (Code Word (CW)) and the same or different layers can also be sent from each TRP of the multiple TRPs. As a method of sending multiple TRPs, Figure 1B As shown, non-coherent joint transmission (NCJT) can also be used. Here, NCJT is performed between TPRs corresponding to different PCIs. In addition, the same service cell setting can be applied / set for TRP#1 and TRP#2.

[0071] Multiple PDSCHs (multi-PDSCHs) subjected to NCJT may also be defined as partially or completely repeated with respect to at least one of the time domain and the frequency domain. That is, at least one of the time and frequency resources of the first PDSCH from TRP#1 and the second PDSCH from TRP#2 may also be repeated. The first PDSCH and the second PDSCH may be used for transmission of the same TB or for transmission of different TBs.

[0072] It can also be assumed that the first PDSCH and the second PDSCH are not in a Quasi-Co-Location (QCL) relationship (not quasi-co-located). Reception of multiple PDSCHs can also be rewritten as simultaneous reception of PDSCHs of a certain QCL type (eg, QCL type D).

[0073] Multiple PDSCHs from multiple TRPs (also referred to as multiple PDSCHs) can also be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single-master mode). One DCI can also be sent from one TRP in multiple TRPs. The structure of using one DCI in multiple TRPs can also be called multiple TRPs (mTRP / MTRP) based on a single DCI.

[0074] Multiple PDSCHs from multiple TRPs can also be scheduled using multiple DCIs (multiple DCI (M-DCI), multiple PDCCHs (multiple PDCCHs)) respectively (multi-master mode). Multiple DCIs can also be sent separately from multiple TRPs. The structure of using multiple DCIs in multiple TRPs can also be called multi-TRP based on multiple DCI (mTRP / MTRP).

[0075] It can also be imagined that the UE sends separate CSI reports (CSI reports) related to different TRPs. Such CSI feedback can also be referred to as separate feedback, separate CSI feedback, etc. In the present disclosure, "separate" and "independent" can also be rewritten.

[0076] In Rel.17 NR, it is assumed that: support for beam indication of TCI status associated with different PCIs through MAC CE / DCI. On the other hand, in Rel.18 NR and later, it is assumed that: support for serving cell switching (for example, serving cell change indication to a cell with a different PCI) through L1 / L2 signaling (for example, DCI / MACCE) (refer to Figure 2 ).

[0077] exist Figure 2 FIG. 3 shows a case where the UE switches from the serving cell to an additional cell (or also referred to as a candidate cell or a target cell) based on a cell switching instruction from a base station.

[0078] (Candidate cell)

[0079] It is also assumed that, in inter-cell mobility, one or more candidate cells are set and managed for each serving cell.

[0080] For example, in a specific high-level parameter (e.g., ServingCellConfig), one or more candidate cells (Alt.1) may be set with limited information (e.g., only a part of the parameters are notified to the UE). It may also be set in the same way as the inter-cell beam management (inter-cell BM) of the existing system (e.g., Rel.17).

[0081] Alternatively, a complete configuration of more than one candidate cell (e.g., ServingCellConfig) may be configured, which is associated with each serving cell (Alt. 2). For example, a framework for carrier aggregation configuration (e.g., CA configuration framework) or a framework for CHO (Conditional Handover) / CPC (Conditional PSCell Change) configuration may be reused.

[0082] In Alt.1 / Alt.2, the activation / deactivation of candidate cells can also be controlled by MAC CE / DCI.

[0083] At least one of the following setting examples 1 to 3 may be applied as the setting of the candidate cell (refer to Figure 3 ). Here is shown an example of setting SpCell#0, SCell#1, and SCell#2 as serving cells, and setting / associating candidate cells (or additional cells) corresponding to the serving cells / cell groups. The following setting examples 1 to 3 are examples, and the number of cells, the association of each cell, etc. are not limited to these, and may be appropriately changed. Alternatively, in addition to setting examples 1 to 3, further to / instead of setting examples 1 to 3, other setting examples may also be supported / applied.

[0084] In the setting example 1, a case where one or more candidate cells are associated / set for each serving cell is shown (refer to Figure 3 ). Specifically, it shows the situation that SpCell#0 is associated with candidate cells #0-1, #0-2, and #0-3, SCell#1 is associated with candidate cells #1-1, and SCell#2 is associated with candidate cells #2-1 and #2-2. Information related to the association can also be set / indicated from the base station to the UE via RRC / MAC CE / DCI.

[0085] In setting example 2, the situation of associating / setting candidate cells for MAC entity / MCG / SCG is shown (refer to Figure 3). Specifically, the case of associating candidate cells #3-#8 with the MAC entity / MCG / SCG is shown. In this case, the candidate cells are not associated with each serving cell, but are set for the MAC entity or cell group (for example, MCG / SCG). Information related to the candidate cells set for each cell can also be set / indicated from the base station to the UE via RRC / MAC CE / DCI.

[0086] In setting example 3, more than one candidate cell group may be set (see Figure 3 ). Specifically, the situation that a candidate cell group #1 having candidate cells #0-#2, a candidate cell group #2 having candidate cells #0 and #1, and a candidate cell group #3 having candidate cell #0 are set is shown. The candidate cell group has more than one candidate cell. The candidate cells included in the candidate cell group may also be associated with at least one of the serving cells. Information related to the candidate cells may also be set / indicated to the UE from the base station via RRC / MAC CE / DCI.

[0087] In an existing system (eg, Rel. 17), an L1 beam indication of a TCI state associated with an additional PCI (or an additional cell) is supported (eg, an indication based on a TCI state field of a DCI).

[0088] After Rel.18, it is envisaged to support a new L1 / L2 signal (e.g., DCI / MAC CE) for indicating the switching of a serving cell (e.g., serving cell switch). As the indication, it is envisaged to support at least one of an implicit indication and an explicit indication. An implicit indication may, for example, also mean that a certain CORESET is updated to a TCI state associated with an additional PCI through a MAC CE. An explicit indication may also mean directly indicating the switching of a cell through a DCI / MAC CE.

[0089] For example, in the example 1 of the candidate cell setting, a specific candidate cell may be designated as a serving cell (or a switching with a serving cell may be instructed) via L1 / L2 signaling. Figure 4A In FIG. 1 , the case where the candidate cell #0-2 becomes the SpCell of the MCG / SCG (switching SpCell #0 and candidate cell #0-2) through L1 / L2 signaling is shown. In addition, the case where the candidate cell #2-1 becomes the SCell of the MCG / SCG (switching SCell #2 and candidate cell #2-1) through L1 / L2 signaling is shown.

[0090] Alternatively, in the example 2 of setting the candidate cell, a specific candidate cell may be designated as a serving cell (or a switching with the serving cell may be instructed) via L1 / L2 signaling. Figure 4B , a case is shown in which the candidate cell #4 becomes the SpCell of the MCG / SCG (switching SpCell #0 and the candidate cell #4) through L1 / L2 signaling.

[0091] Alternatively, in the candidate cell setting example 3, a specific candidate cell group (or one or more candidate cells included in the specific candidate cell group) may be changed / updated to a serving cell group via L1 / L2 signaling. Figure 4C , a case is shown in which, through L1 / L2 signaling, candidate cell group #1 (or candidate cells #0-#2 included in candidate cell group #1) becomes the serving cell group (switching the serving cell group and candidate cell group #1).

[0092] (Timing Advance Group)

[0093] When using multiple TRPs, there may be a situation where the distance between the UE and each TRP is different. Multiple TRPs may also be included in the same cell (for example, a service cell). Alternatively, one of the multiple TRPs may be equivalent to a service cell, and the other TRPs may be equivalent to a non-service cell. In this case, it is also assumed that the distance between each TRP and the UE is different.

[0094] In existing systems, the transmission timing of UL (Uplink) channels and / or UL signals (UL channels / signals) is adjusted by timing advance (TA). The reception timing of UL channels / signals from different user terminals (UE) is adjusted on the wireless base station (also called TRP: Transmission and Reception Point, gNB: gNodeB, etc.) side.

[0095] The UE may also apply timing advance (multiple timing advances) for each preset timing advance group (TAG) to perform timing control of UL transmission.

[0096] When multiple timing advances are applied, a timing advance group (TAG) classified by transmission timing is supported. The UE can also assume that the same TA offset (or TA value) is applied to each TAG to control the UL transmission timing in each TAG. In other words, the TA offset can also be set independently for each TAG.

[0097] When multiple timing advances are applied, the UE independently adjusts the transmission timing of cells belonging to each TAG, thereby making it possible to make the reception timing of uplink signals from the UE consistent in the radio base station even when a plurality of cells are used.

[0098] TAGs (e.g., service cells belonging to the same TAG) can also be set by high-level parameters. The same timing advance value can also be applied to service cells belonging to the same TAG (e.g., service cells set to UL). The timing advance group of the SpCell containing the MAC entity can also be called a primary timing advance group (PTAG), and other TAGs can also be called secondary timing advance groups (STAGs). In addition, the maximum number of TAGs can also be X (e.g., X=4) per cell group (e.g., MCG / SCG).

[0099] In the existing system (e.g., Rel.16 NR), the configuration of a maximum of 4 TAGs per cell group (e.g., MCG / SCG) is supported (refer to Figure 5 ).exist Figure 5 In FIG. 1 , it is shown that three tags are set for a cell group including SpCell and SCell#1 to SCell#4. Here, it is shown that SpCell and SCell#1 belong to the first TAG (PTAG or TAG#0), SCell#2 and SCell#3 belong to the second TAG (TAG#1), and SCell#4 belongs to the third TAG (TAG#2).

[0100] The timing advance command (TA command) may also be notified to the UE using a MAC control element (e.g., MAC CE). The TA command is a command indicating a transmission timing value of an uplink channel and is included in the MAC control element. The TA command is a signaling notification from the wireless base station to the UE at the MAC layer. Based on the reception of the TA command, the UE controls a specific timer (e.g., a TA timer).

[0101] The MAC CE for the timing advance command may also be a structure including a field for the timing advance group index (eg, TAG ID) and a field for the timing advance command (see Figure 6 The TAG ID field is used to indicate the TAG ID of the TAG being addressed. The Timing Advance Command field may also indicate the index value T used in controlling the amount of timing adjustment that the MAC entity must apply. A (0, 1, 2…63).

[0102] The parameters corresponding to each TAG ID can also be set through high-level parameters. For example, parameters such as the time alignment timer (e.g., timeAlignmentTimer) corresponding to each TAGID can also be set. Alternatively, the TAG ID can be set for each serving cell through high-level parameters (e.g., tag-ID included in ServingCellConfig). In addition, the TAG ID / parameters can also be updated through MAC CE after being set through high-level parameters.

[0103] The time alignment timer may also be maintained for UL time alignment. In Rel.17, the time alignment timer may also be set for each TAG / associated with each TAG. Upon receiving a MAC CE for a timing advance command (e.g., a TAC MAC CE), the UE starts or restarts (restarts) the time alignment timer associated with the indicated timing advance group (e.g., TAG), respectively.

[0104] The MAC entity receives the TAC MAC CE and maintains a specific value (N TA ), apply the timing advance command corresponding to the indicated TAG, or start or restart (restart) the time alignment timer associated with the indicated TAG. TA ) can also be the timing advance between DL and UL.

[0105] The operation when the time alignment timer expires (expires) can also be defined separately in PTAG and STAG. In addition, the timing advance group (TAG) of the SpCell including the MAC entity can also be called the primary timing advance group (PTAG), and the other TAGs can also be called secondary timing advance groups (STAG).

[0106] For example, Rel. 17 supports: when the timing advance timer corresponding to PTAG expires, a specific operation for PTAG is applied; when the timing advance timer corresponding to STAG expires, a specific operation for STAG is applied.

[0107] For example, when the time alignment timer expires, the following operations (eg, operations for a specific PTAG / operations for a specific STAG) may be performed.

[0108] [Specific PTAG operation]

[0109] In case the time alignment timer is associated with PTAG,

[0110] ・Flush all HARQ buffers of all serving cells.

[0111] ・When configured, notification is made in RRC to release PUCCH for all serving cells.

[0112] ・When set, notify in RRC to release SRS.

[0113] ・Clear all configured DL allocations and configured UL allocations.

[0114] ・Clear PUSCH resources used for semi-persistent CSI reporting.

[0115] ・Align all running events to the timer expiration.

[0116] ・Maintain N of all tags TA .

[0117] [Specific STAG operation]

[0118] When the time alignment timer is associated with a STAG, for all serving cells belonging to the TAG,

[0119] ・Flush all HARQ buffers.

[0120] ・When configured, notify in RRC to release PUCCH.

[0121] ・When set, notify in RRC to release SRS.

[0122] ・Clear all configured DL allocation and UL allocation.

[0123] ・Clear PUSCH resources used for semi-persistent CSI reporting.

[0124] ・Maintain the N of this tag TA .

[0125] As described above, when setting / defining candidate cells, it is assumed that each candidate cell is associated with a TAG (see Fig. 7A , Figure 7B ). Fig. 7A An example of a TAG (or a setting of a TAGID) for each cell group in an existing system (for example, before Rel. 17) is shown. Figure 7B An example of setting the TAG ID for each candidate cell is shown.

[0126] In addition, in the case of setting / applying / supporting candidate cells, such as Figure 7BAs shown, it is assumed that different serving cells / different candidate cells are associated with the same TAG.

[0127] When the TA of the candidate cell is obtained, the RACH (or random access procedure) to the candidate cell may be supported.

[0128] As described above, when setting / applying / supporting candidate cells, inter-cell mobility (e.g., switching from a serving cell to a candidate cell (or an additional cell / target cell)) is envisioned, but how to control this situation has not been fully studied. If switching between a serving cell and a candidate cell (e.g., inter-cell mobility) is not properly performed, there is a concern that communication quality may deteriorate.

[0129] The present inventors focused on inter-cell mobility (eg, cell switching) when setting / supporting candidate cells (or additional cells, target cells), studied an appropriate control method for the inter-cell mobility, and conceived the present embodiment.

[0130] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, each of the following modes (for example, each situation) may be used alone or in combination of at least two.

[0131] In the present disclosure, "A / B" and "at least one of A and B" may be replaced with each other. In addition, in the present disclosure, "A / B / C" may also mean "at least one of A, B, and C".

[0132] In the present disclosure, activate, deactivate, indicate (or specify), select, configure, update, determine, etc. may also be mutually rewritten. In the present disclosure, support, control, controllable, operate, and can operate may also be mutually rewritten.

[0133] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, high-layer parameters, information elements (IE), settings, etc. may also be overwritten with each other. In the present disclosure, Medium Access Control (MAC) control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc. may also be overwritten with each other.

[0134] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0135] In the present disclosure, MAC signaling may also use, for example, MAC Control Element (MACCE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0136] In the present disclosure, the physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI)), etc.

[0137] In the present disclosure, an index, an identifier (ID), an indicator, a resource ID, etc. may also be overwritten with each other. In the present disclosure, a sequence, a list, a set, a group, a cluster, a subset, etc. may also be overwritten with each other.

[0138] In the present disclosure, panel, UE panel, panel group, beam, beam group, precoder, uplink (UL) transmission entity, transmission / reception point (TRP), base station, spatial relation information (SRI), spatial relation, SRS resource indicator (SRI), control resource set (CORESET), physical downlink shared channel (PDSCH), codeword (CW), transport block (TB), reference signal (RS), antenna port (e.g., demodulation reference signal (DMRS)) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, code division multiplexing (CDM)) group, reference signal group, CORESET group, physical uplink control channel (PDSCH)), codeword (CW), transport block (TB), reference signal (RS), antenna port (e.g., demodulation reference signal (DMRS)) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, code division multiplexing (CDM)) group, reference signal group, CORESET group, physical uplink control channel (PDSCH)), Channel (PUCCH)) group, PUCCH resource group), resources (for example, reference signal resources, SRS resources), resource sets (for example, reference signal resource sets), CORESET pool, downlink transmission configuration indication state (Transmission Configuration Indicationstate) (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL)), QCL assumptions, etc. can also be rewritten mutually.

[0139] In addition, the spatial relationship information identifier (Identifier (ID)) (TCI state ID) and the spatial relationship information (TCI state) can also be overwritten with each other. "Spatial relationship information" can also be overwritten with "a collection of spatial relationship information", "one or more spatial relationship information", etc. TCI state and TCI can also be overwritten with each other.

[0140] In the following embodiments, "plurality" and "2" may be replaced by each other. In addition, "TAG" and "TAG ID" may be replaced by each other. In addition, "cell", "CC" and "carrier" may be replaced by each other.

[0141] The following description can be applied to inter-cell mobility (eg, L1 / L2 inter-cell mobility) or communication control other than inter-cell mobility. L1 / L2 inter-cell mobility can also be rewritten as at least one of cell handover, cell switch, and cell change.

[0142] (Wireless Communication Method)

[0143] <First embodiment>

[0144] In the first embodiment, an example of UE operation / base station operation when (or after) receiving a cell switching instruction is described.

[0145] The base station may also set information related to the structure of multiple candidate cells to the UE through high-level signaling. The high-level signaling may be RRC reconfiguration signaling (eg, RRC reconfiguration signaling), a high-level parameter related to the cell, or other high-level parameters.

[0146] In addition, the base station can also use MAC CE / DCI to indicate the change or switching of the serving cell to the UE. The UE performs the cell switching process / switching operation based on the cell switching indication indicated by the MAC CE / DCI. The cell switching indication can also be called cell switching indication signaling or L1 / L2 inter-cell mobility indication.

[0147] At least one of information on a candidate cell serving as a handover destination (eg, a candidate cell index or a physical cell ID (PCI)), information on a serving cell serving as a handover source, and information on other candidate cells may be included in the MAC CE / DCI.

[0148] In the present disclosure, the change of the serving cell may also be rewritten as the switching of the serving cell, the switching of the serving cell, or the L1 / L2 cell switching (e.g., L1 / L2 cell switching). In the present disclosure, the change of indicating the serving cell may also be rewritten as the change of activating / activating the serving cell.

[0149] When a change in the serving cell is instructed, the UE may assume that L1 / L2 inter-cell mobility is set to be valid.

[0150] Upon receiving information indicating a change in the serving cell (or, a change to a candidate cell), the UE may also change the serving cell setting to the target cell (or, the candidate cell) based on the cell setting pre-set by the higher layer parameters. The UE may also assume a new beam / TCI state / spatial relationship and receive DL transmissions from the target cell. Information related to the new beam / TCI state / spatial relationship may also be pre-set / indicated to the UE from the base station using higher layer parameters (e.g., higher layer parameters related to the candidate cells).

[0151] The UE may also assume a specific beam / TCI state / spatial relationship without being set / indicated information related to a new beam / TCI state / spatial relationship. The specific beam / TCI state / spatial relationship may also be determined based on the PRACH transmission of the target cell (or candidate cell). For example, the UE may also determine / assume a specific beam / TCI state / spatial relationship based on the latest PRACH transmission associated with the SSB of the target cell.

[0152] In addition, when the UE detects a MACCE / DCI indicating a change in the serving cell (or a change to a candidate cell), it may also change to the serving cell set by the RRC setting of the updated cell (e.g., the RRC setting of the candidate cell) after a specific period. In the present disclosure, the specific period may also be rewritten as a specific offset.

[0153] The specific period may also be Xms or X symbols from the detected MAC CE / DCI. Alternatively, the specific period may be Yms / Y symbols from the HARQ-ACK feedback corresponding to the detected MAC CE / DCI. X and Y may be determined based on UE capabilities / UE types, defined in the specification, or set to the UE from the base station.

[0154] In this way, when the cell switching (e.g., L1 / L2 inter-cell mobility) is successful, the target cell is considered to be used as the serving cell to control the transmission and reception operations. In this case, the success / failure of the cell switching can also be defined as follows. Option 1A-1 to Option 1A-3 show an example of a successful cell switching (e.g., L1 / L2 inter-cell mobility), and Option 1B-1 to Option 1B-2 show an example of a failed cell switching (e.g., L1 / L2 inter-cell mobility).

[0155] [Option 1A-1]

[0156] When the UE sends a HARQ-ACK in response to the handover instruction of the serving cell, it can also mean that the handover of the cell is successful and the UE operation / base station operation is controlled. Figure 8 ), can also mean ACK / NACK.

[0157] Figure 8 The present invention shows a case where a base station sends a serving cell switching indication (e.g., L1 / L2 cell switch indication signaling) to a UE, and the UE sends an ACK in response to the switching indication, which means that the cell switching is successful. In this case, the present invention shows a case where a switching to a new serving cell is controlled after a specific period (e.g., Y) after the cell switching is successful (e.g., after the ACK is sent).

[0158] In the case where HARQ-ACK means ACK, even if the UE sends NACK (before sending ACK), it may not mean that the cell switching is successful. That is, NACK feedback or retransmission of L1 / L2 signaling may also exist before ACK is sent.

[0159] For example, when the switching indication of the serving cell is indicated by a MAC CE, and when the HARQ-ACK feedback corresponding to the PDSCH transmitting the MAC CE is ACK, it can also be defined that the switching of the serving cell is successful.

[0160] When the serving cell switching instruction is indicated by DCI, the definition of ACK may be different depending on whether the DCI includes DL assignment / UL assignment (for example, DL assignment / UL assignment).

[0161] When DCI including DL assignment (eg, DL assignment) is used for indicating switching of the serving cell, if HARQ-ACK feedback corresponding to the PDSCH scheduled by the DCI is ACK, it may be defined that the switching of the serving cell is successful.

[0162] In the case where a DCI that does not include a DL allocation / UL allocation (e.g., DL allocation / UL allocation) is used for a switching indication of a serving cell, if the HARQ-ACK feedback corresponding to the DCI (or the PDCCH transmitting the DCI) is ACK, it can also be defined as a successful switching of the serving cell. In this case, the CRC attached to the DCI can also be scrambled by a specific RNTI (e.g., an RNTI other than the C-RNTI).

[0163] In the case where a DCI including an UL allocation (e.g., UL assignment) is used for a switching indication of a serving cell, the PUSCH scheduled by the DCI can also be regarded as a HARQ-ACK feedback with ACK. That is, the switching of the serving cell can also be defined as successful through the feedback of the PUSCH. Alternatively, in the case where the base station reschedules a PUSCH with the same HPN (the same HPN with the NDI toggled), it can also be defined as a successful switching of the serving cell.

[0164] [Option 1A-2]

[0165] When the UE receives DL from a new target cell (or a candidate cell for the target cell to be changed) within a certain window / timer (e.g., a certain window / timer), it may also mean that the cell switching is successful, and the UE operation / base station operation is controlled (see Fig. 9 ). The DL received by the UE may also be rewritten as at least one of a DL transmission, a DL signal, and a DL channel.

[0166] The specific window / timer may also be started, for example, after the HARQ-ACK (e.g., ACK) corresponding to the handover indication of the serving cell is sent or after a specific period (e.g., Y) has passed after the HARQ-ACK is sent. Of course, the start time of the specific window / timer is not limited to this. The specific window / timer (e.g., at least one of the start time (starting time slot, starting code element, etc.) and length) may be defined in the specification or may be set / indicated to the UE from the base station using RRC parameters / MAC CE / DCI.

[0167] The DL received by the UE may also be at least one of the following options 1A-2-1 to 1A-2-3.

[0168] 《Option 1A-2-1》

[0169] The DL received by the UE may also be a DL reference signal (e.g., DL-RS). For example, when the UE receives (or measures) a DL reference signal sent from a new target cell, it may also mean that the handover of the serving cell is successful. The DL reference signal may also be at least one of an SSB, a CSI-RS, and a source RS (source RS) of an indicated TCI state sent from a new target cell.

[0170] 《Option 1A-2-2》

[0171] The DL received by the UE may also be a DL channel (e.g., PDCCH / PDSCH) or downlink control information (e.g., DCI). For example, when the UE receives (or decodes / detects / monitors) a DL channel / DCI sent from a new target cell, it may also mean that the handover of the serving cell is successful. The DL channel (e.g., PDCCH / PDSCH) or DCI may also be a PDCCH / PDSCH corresponding to a specific format / type.

[0172] For example, when the UE receives DCI in a common search space (eg, CSS), it may also mean that the handover of the serving cell is successful.

[0173] Alternatively, when the UE receives a PDCCH / PDSCH with the same HARQ process ID as the previous L1 / L2 cell switch signaling (e.g., previous L1 / L2 cell switch signaling), it may also mean that the switching of the serving cell is successful. The previous L1 / L2 cell switch signaling may also have a toggled NDI (assuming that there is no MAC reset).

[0174] 《Option 1A-2-3》

[0175] The DL received by the UE may also be an explicit indication for confirming (or activating, reactivating) the switching of the serving cell. The explicit indication may also be, for example, an RRC parameter / MAC CE / DCI corresponding to the explicit indication.

[0176] In at least one of options 1A-2-1 to 1A-2-3, RACH transmission (or RACH process) to the new target cell may be terminated before cell switching, and TA to the new target cell may be acquired before cell switching.

[0177] [Option 1A-3]

[0178] When the UE completes the random access procedure (or RACH procedure) for a new target cell (or a candidate cell for the destination change) within a specific window / timer (e.g., a certain window / timer), it may also mean that the cell switching is successful and the UE operation / base station operation is controlled.

[0179] In option 1A-3, RACH transmission (or RACH procedure) to the new target cell may not be performed before cell switching, or TA may not be acquired. In this case, the UE may perform the RACH procedure after switching to the new serving cell.

[0180] [Option 1B-1]

[0181] Failure to receive a specific DL before the end / expiration of a specific window / timer (or within a specific window / timer) may also mean that the cell handover has failed (see Fig.10 , Fig.11 ). The specific window / timer and the specific DL may also be the window / timer and DL shown in option 1A-2.

[0182] Fig.10 It shows a situation where, after the UE sends HARQ-ACK (eg, ACK) for a handover indication of a serving cell, a specific DL cannot be received before the end / expiration of a specific window / timer (or within a specific window / timer). Fig.11 It shows a case where the UE fails to receive a specific DL before the end / expiration of a specific window / timer (or within a specific window / timer) after applying a handover to a new target cell.

[0183] In this case, the UE may also declare / notify / report that the handover of the cell (eg, L1 / L2 inter-cell mobility) has failed or a handover of the cell (eg, L1 / L2 inter-cell mobility) failure has occurred.

[0184] The duration of a specific window / timer (e.g., starting time / length, etc.) can be set from the base station to the UE via RRC parameters, or can be included in a MAC CE / DCI for indicating a cell switching and indicated from the base station to the UE. The starting time can also be a starting time slot or a starting symbol.

[0185] [Option 1B-2]

[0186] When the UE fails to complete the random access procedure (or RACH procedure) to the new target cell before the end / expiration of a specific window / timer (or within a specific window / timer), it may also mean that the cell handover has failed. In this case, the UE may also declare / notify / report that the cell handover (e.g., L1 / L2 inter-cell mobility) has failed or that a cell handover (e.g., L1 / L2 inter-cell mobility) failure has occurred.

[0187] In the case where the cell handover fails (for example, option 1B-1 or option 1B-2), the UE may also apply the UE operation shown in at least one of the following options 1-1 to 1-3.

[0188] 《Option 1-1》

[0189] The UE may also return to the original serving cell (eg, the serving cell of the handover source) and apply the last TCI state in the cell to monitor DL ​​transmission (eg, PDCCH).

[0190] After the UE sends HARQ-ACK (e.g., ACK) for the handover indication of the serving cell, if DL cannot be received within a specific window / timer (option 1B-1) or the RACH process is not completed (option 1B-2), at least the ACK transmission is successful. In this case, the channel quality of the original serving cell is good and there is a possibility that communication (e.g., DL reception) can be performed appropriately.

[0191] 《Option 1-2》

[0192] The UE may also perform RACH transmission (or random access procedure) for a specific cell (e.g., a certain cell). The specific cell may also be at least one of an original serving cell (e.g., a serving cell of a switching source) and a new target cell. For example, the random access procedure during a radio link failure (RLF) may also be reused.

[0193] 《Options 1-3》

[0194] The UE may also perform RACH transmission (or random access procedure) for any cell (eg, any cell (ayn cell)). For example, the random access procedure performed by the UE in the idle state (UE in IDLE) may be reused.

[0195] Regarding different UE operations after a cell handover (eg, L1 / L2 inter-cell mobility) fails, UE capabilities may also be introduced.

[0196] <Second embodiment>

[0197] In the second embodiment, an example of UE operation / base station operation in the case of supporting different mobility procedures (or cell change procedures) will be described.

[0198] After Rel.18, it is also envisioned to support L1 / L2 inter-cell mobility (for example, R18 L1 / L2 inter-cell mobility) and L3 mobility (for example, legacy L3mobility). L3 mobility can also be, for example, handover, CHO (for example, Conditional Handover) or CPC (Conditional PSCell Change). In this case, it is necessary to properly control the interaction of multiple (here 2) processes (or the presence or absence of conflict / operation in the event of conflict).

[0199] In the case of supporting multiple mobility procedures, at least one of the following options 2-1 to 2-4 may also be applied. The mobility procedure may also be rewritten as a cell change procedure, a cell handover procedure, a cell switching procedure, or a cell update procedure. In addition, in the following description, as multiple mobility procedures, first mobility (e.g., L1 / L2 inter-cell mobility) and second mobility (e.g., L3 mobility) are cited as examples, but the mobility category / type is not limited thereto. The L3 mobility procedure may also reuse the procedure (e.g., handover procedure) of an existing system (e.g., before Rel. 17).

[0200] [Option 2-1]

[0201] Assume that the first mobility process (for example, a cell switching process between L1 / L2 cells) is in progress. The so-called cell switching process between L1 / L2 cells is in progress (ongoing), for example, it can also refer to the situation where the UE has received the signaling indicating the L1 / L2 cell switching (and before the cell switching is completed).

[0202] In this case, the UE may not assume the reception of the second mobility indication / execution of the second mobility procedure before the L1 / L2 cell switching procedure is completed (or, succeeds) (see Fig. 12A ). The so-called before the L1 / L2 cell switching process is completed (or succeeded) may also mean before the success or failure of the cell switching shown in the first embodiment.

[0203] As a result, a configuration is achieved in which the second mobility is not performed while the first mobility (for example, a cell switching process between L1 / L2 cells) is in progress, thereby being able to avoid a situation in which the two mobility processes occur simultaneously.

[0204] [Option 2-2]

[0205] It is assumed that the second mobility procedure (e.g., L3 mobility procedure) is in progress. In this case, the UE may also be assumed not to receive the first mobility indication (e.g., L1 / L2 cell switching indication signaling) before the L3 mobility procedure (e.g., handover / CHO / CPC) is completed (see Fig. 12B ).

[0206] As a result, a structure is formed in which the first mobility (for example, the cell switching process between L1 / L2 cells) is not performed during the second mobility (for example, the switching process), thereby avoiding the situation where the two mobility processes occur at the same time.

[0207] [Option 2-3]

[0208] In the case where a first mobility procedure (e.g., a cell handover procedure between L1 / L2 cells) is in progress, before the L1 / L2 cell handover procedure is completed (or succeeded), reception of a second mobility indication / execution of a second mobility procedure may be allowed / supported. That is, a conflict between the first mobility procedure and the second mobility procedure may be allowed / supported.

[0209] Before the L1 / L2 cell switching process is completed (or succeeds), when an L3 switching command is received (or when the UE determines that the CHO / CPC conditions are met), at least one of the following options 2-3-1 to 2-3-3 may also be applied.

[0210] 《Option 2-3-1》

[0211] The mobility procedure to be applied may also be selected based on the priority corresponding to the mobility procedure. The priority corresponding to each mobility procedure may be defined in the specification or may be set from the base station to the UE through a higher layer parameter or the like.

[0212] For example, the UE may also perform the first mobility process (for example, a cell switching process between L1 / L2 cells). That is, the UE may also perform the first mobility process preferentially over the second mobility process. In this case, control may also be performed so that the second mobility process is not performed (or canceled).

[0213] Alternatively, the UE may also perform a second mobility procedure (eg, an L3 mobility procedure). That is, the UE may also perform the second mobility procedure with priority over the first mobility procedure. In this case, control may also be performed so that the first mobility procedure is not performed (or canceled).

[0214] 《Option 2-3-2》

[0215] The applied mobility procedures may also be selected based on the indicated (or, starting) timing / sequence of the mobility procedures.

[0216] For example, the mobility process indicated later (or started) may be preferentially performed. When the first mobility is in progress and the second mobility indication is received / the second mobility process is executed, the UE may also control to cancel or stop the first mobility process in progress and execute the second mobility process indicated later (refer to Fig.13A ).

[0217] Alternatively, the mobility process indicated initially (or started) may be performed preferentially. When the first mobility is in progress and the second mobility indication is received / the second mobility process is performed, the UE may also control the first mobility process in progress to continue and not perform the second mobility process indicated later.

[0218] 《Option 2-3-3》

[0219] The UE may also autonomously select the mobility procedure to be performed.

[0220] [Option 2-4]

[0221] When a second mobility procedure (e.g., L3 mobility procedure) is in progress, reception of a first mobility indication (e.g., L1 / L2 cell switching indication signaling) / execution of the first mobility procedure may also be allowed / supported before the L3 mobility procedure (e.g., handover / CHO / CPC) is completed.

[0222] Before the second mobility procedure is completed (or succeeded), when the first mobility procedure (eg, L1 / L2 cell switching indication signaling) is received, at least one of the following options 2-4-1 to 2-4-3 may also be applied.

[0223] 《Option 2-4-1》

[0224] The mobility procedure to be applied may also be selected based on the priority corresponding to the mobility procedure. The priority corresponding to each mobility procedure may be defined in the specification or may be set from the base station to the UE through a higher layer parameter or the like.

[0225] For example, the UE may also perform the first mobility process (e.g., a cell switching process between L1 / L2 cells). That is, the UE may also perform the first mobility process preferentially over the second mobility process. In this case, control may also be performed so that the second mobility process is not performed (or canceled).

[0226] Alternatively, the UE may also perform a second mobility process (eg, an L3 mobility process). That is, the UE may also perform the second mobility process preferentially over the first mobility process. In this case, control may also be performed so that the first mobility process is not performed (or canceled).

[0227] 《Option 2-4-2》

[0228] The mobility procedures to be applied may also be selected based on the indicated (or, starting) timing / sequence of the mobility procedures.

[0229] For example, the mobility process indicated later (or started) may be preferentially performed. When the first mobility indication is received while the second mobility is in progress, the UE may also control to cancel or stop the ongoing second mobility process and perform the first mobility process indicated later (refer to Fig. 13B ).

[0230] Alternatively, the mobility process indicated initially (or started) may be performed preferentially. When the first mobility indication is received while the second mobility is in progress, the UE may also control the ongoing second mobility process to continue and not perform the first mobility process indicated later.

[0231] 《Option 2-4-3》

[0232] The UE may also autonomously select the mobility procedure to be performed.

[0233] In Option 2-1 to Option 2-4, as L3 mobility, a case including a handover procedure (e.g., L3 handover command procedure) and a CHO / CPC procedure (e.g., L3 CHO / CPC procedure) is shown, but it is not limited thereto. The handover procedure (e.g., L3 handover command procedure) and the CHO / CPC procedure (e.g., L3 CHO / CPC procedure) may also be applied as separate procedures.

[0234] Regarding the interaction between the first mobility and the second mobility, different UE capabilities may be introduced / supported according to each of the above options.

[0235] <Third Embodiment>

[0236] In the third embodiment, an example of indication / activation of a TCI state associated with an additional PCI is described. In the present disclosure, the additional PCI may also be rewritten as an additional cell, a candidate cell, or a target cell.

[0237] In Rel.17 inter-cell beam management (e.g., Rel-17 inter-cell beam management), it is supported that: MAC CE can activate up to 8 TCI states, and some TCI states are associated with additional PCIs (e.g., additional PCIs). However, it is limited to the same frequency as the serving cell (see Fig.14 ).

[0238] Fig.14 The figure shows the case where a maximum of 7 additional PCIs (or candidate cells, target cells, additional cells) are set at the same frequency as the serving cell in the inter-cell beam management (ICBM) supported in Rel.17. The MAC CE can indicate the activation of the TCI state of the same frequency. The frequency can also be rewritten as the frequency domain or the frequency band.

[0239] In L1 / L2 inter-cell mobility after Rel.18, it is also envisioned to support: considering the inter-frequency scenario, MAC CE activates the TCI state associated with the additional PCI at a frequency different from the serving cell. As an indication / activation of the TCI state in L1 / L2 inter-cell mobility, at least one of the following options 3-1 to 3-3 may also be applied.

[0240] [Option 3-1]

[0241] In L1 / L2 inter-cell mobility, the TCI state activated by the MAC CE for the serving cell may be associated with an additional PCI of the same frequency as the serving cell. The MAC CE may also be a MAC CE for dynamic beam indication.

[0242] Fig.15 An example is shown in which the TCI state activated by the MAC CE is associated with an additional PCI, which corresponds to the same frequency as the serving cell.

[0243] Here, it is shown that SpCell#0 is set in the first frequency (for example, f0), and for this SpCell#0, the TCI state activated by MAC CE is associated with this SpCell#0, cell#0-1, cell#0-2, cell#0-3, and cell#0-4.

[0244] In addition, it is shown that SCell#1 is set in the second frequency (for example, f1), and for this SCell#1, the TCI state activated by MAC CE is associated with this SCell#1, cell#1-1, cell#1-2, and cell#1-3.

[0245] In cells with different frequencies, the cell settings and frequencies are different, so there is a possibility of UE operation being complicated when supporting dynamic beam indication between these cells. In this case, for each serving cell, the MAC CE can activate the TCI state of the same frequency.

[0246] In addition, L1 / L2 cell switching can be performed both within the frequency and between frequencies. As to whether to apply intra-frequency cell switching or inter-frequency cell switching, the base station can also set it to the UE through high-layer signaling. Alternatively, as to whether to apply intra-frequency cell switching or inter-frequency cell switching, it can also be determined based on UE capability information instead of high-layer signaling (or, in addition to high-layer signaling).

[0247] Fig.16 An example of cell switching between frequencies is shown. Here, when cell switching is indicated by L1 / L2 cell switching signaling, a new target cell with a different frequency from the current serving cell can also be indicated for the serving cell. In this case, the TCI state corresponding to the target cell can also be activated by a MAC CE of a different frequency.

[0248] For example, the UE may also be instructed to switch from SpCell#0 to a cell of candidate cell #1-1 to #1-3 corresponding to a frequency different from that of the SpCell. In this case, the UE may also assume that the TCI state corresponding to the switched cell (e.g., candidate cell #1-1) is the TCI state activated by the MAC CE corresponding to SCell#1.

[0249] [Option 3-2]

[0250] In L1 / L2 inter-cell mobility, the TCI state activated by the MAC CE may be associated with at least one of an additional PCI of the same frequency as the serving cell and an additional PCI of a different frequency for the serving cell. The MAC CE may also be a MAC CE for dynamic beam indication.

[0251] Fig.17 An example of supporting MAC CE activation of a TCI state associated with an additional PCI corresponding to the same frequency as the serving cell and a TCI state associated with an additional PCI corresponding to a different frequency is shown.

[0252] exist Fig.17 In the figure, it is shown that candidate cells #0-1, #0-2, and #0-3 are set in the same frequency (f0) as SpCell#0, candidate cells #1-1 and #1-2 are set in a different frequency f1, and candidate cells #2-1 and #2-2 are set in a different frequency f2. In addition, it is shown that SpCell#0, candidate cells #0-1, #0-2, and #0-3 correspond to PCI#0, candidate cells #1-1 and #1-2 correspond to PCI#1, and candidate cells #2-1 and #2-2 correspond to PCI#2.

[0253] Here, the TCI state activated by MAC CE for SpCell#0 is associated with SpCell#0, candidate cells #0-1, #0-2, #0-3, #1-1, #1-2, #2-1, and #2-2. More specifically, the TCI state of SpCell#0 (here TCI#0), the TCI state of candidate cell #0-1 (here TCI#1), the TCI state of candidate cell #0-2 (here TCI#2), the TCI state of candidate cell #0-3 (here TCI#3), the TCI state of candidate cell #1-1 (here TCI#4), the TCI state of candidate cell #1-2 (here TCI#5), the TCI state of candidate cell #2-1 (here TCI#6), and the TCI state of candidate cell #2-2 (here TCI#7) are activated by MAC CE (e.g., MAC CE corresponding to SpCell#0).

[0254] When multiple serving cells are configured (e.g., carrier aggregation), the multiple serving cells may also share the TCI state activated by one or more MAC CEs (e.g., one or more MAC CEs corresponding to different frequencies / cells) (see Fig.18 ).

[0255] exist Fig.18The figure shows that SpCell#0, candidate cells #0-1, #0-2, #0-3 are set in the first frequency domain (f0), SCell#1, candidate cells #1-1, #1-2 are set in the second frequency domain (f1), and SCell#2, candidate cells #2-1, #2-2 are set in the third frequency domain (f2). In addition, it shows that SpCell#0, candidate cells #0-1, #0-2, #0-3 correspond to PCI#0, SCell#1, candidate cells #1-1, #1-2 correspond to PCI#1, and SCell#2, candidate cells #2-1, #2-2 correspond to PCI#2.

[0256] Here, it is shown that for SpCell#0, SCell#1, and SCell#2, the TCI state activated by MAC CE is associated with SpCell#0, candidate cells #0-1, #0-2, #0-3, #1-1, #1-2, #2-1, and #2-2.

[0257] The TCI status of each cell with different frequencies can also be activated by a certain MAC CE. Alternatively, the serving cells / candidate cells sharing the MAC CE can also be grouped. The group of cells whose TCI status is activated by the common MAC CE can be set by high-level signaling or defined in the specification.

[0258] [Option 3-3]

[0259] It is also possible that the TCI state activated by the MAC CE for dynamic beam indication (or cell switching) is associated with an additional PCI of the same frequency, and the actual frequency (or PCI) applied follows the frequency of the source serving cell or the target cell (or cell index, reference signal resource index (for example, resource RS index)).

[0260] Fig.19 An example of a case where the TCI state activated by the MAC CE is associated with the additional PCI corresponding to the same frequency as the serving cell.

[0261] Here is shown the situation where SpCell#0, candidate cells #0-1, #0-2, #0-3, and #0-4 are set in the first frequency (for example, f0), and for the SpCell#0 (or, f0), the TCI state activated by the MAC CE is associated with the SpCell#0, cell #0-1, cell #0-2, cell #0-3, and cell #0-4.

[0262] In case that the activated TCI state is applied to the frequency corresponding to SCell#1, the same TCI state ID (or the same cell ID / resource RS index for each frequency) may also be applied to the frequency of SCell#1.

[0263] In this case, an association between cell indices of different frequencies may be set / defined. The association may be implicit (eg, implicit association) or explicit (eg, explicit association).

[0264] As an implicit association, for example, the cell index #x of f0 (e.g., cell (re-) index #x) can also be associated with the cell index #x of f1 (e.g., cell (re-) index #x). As an example, the candidate cells #0-2 of f0 can also be associated with the candidate cells #1-2 of f1.

[0265] As an explicit association, multiple cells (for example, cells of different frequencies) that apply the same TCI state in different frequencies may be associated through high-layer signaling.

[0266] It is also possible to import UE capabilities related to the support of associations between cells of different frequencies. In addition, for additional PCI cell scenarios, it is also possible to import UE capabilities related to whether the application of the above-mentioned TCI state is supported.

[0267] 《Setting Example #1》

[0268] The candidates (also referred to as TCI state pool) that can be set to the serving cell / candidate cell may also be cell (or CC) specific. In the case where the TCI state pool is CC specific, the TCI state ID corresponding to each CC / frequency may also start from a specific value (e.g., 0). In addition, the resource RS (e.g., QCL type A / D RS) may also have a BWP / CC ID for each frequency.

[0269] For example, consider the case where, for f0, TCI state #3 includes resources from candidate cell #0-2 (e.g., SSB #2), and for f1, TCI state #3 includes resources from candidate cell #1-1 (SSB #3) (see Fig. 20 ).

[0270] exist Fig. 20The figure shows the case where SpCell#0, candidate cells #0-1, #0-2 are set in f0, and SCell#1, candidate cells #1-1, #1-2 are set in f1. In addition, the figure shows the case where TCI state ID#3 is set for candidate cell #0-2 (sending SSB#2) through high-layer parameters, and TCI state ID#3 is set for candidate cell #1-1 (sending SSB#3) through high-layer parameters.

[0271] In this case, when the MAC CE activates at least TCI state #3, it may also mean that TCI state #3 is activated for each frequency (each TCI state pool of different CC / frequency).

[0272] In addition, when the L1 / L2 cell switching signaling indicates the candidate cell #1-1 as the target cell and indicates TCI state ID#3 as the TCI state, the TCI state ID#3 of the frequency f1 corresponding to the candidate cell #1-1 can also be applied.

[0273] exist Fig. 20 In the example shown, it is also possible to support the same TCI state ID of each CC having different resources RS and cell ID.

[0274] 《Setting Example #2》

[0275] The candidates for TCI states that can be set for the serving cell / candidate cell (also called TCI state pool) can also be common to cells (or CCs). When the TCI state pool is CC-common, the TCI state ID can also be set for the reference BWP / CC.

[0276] For example, consider the case where, for f0, TCI state ID #3 includes resources (e.g., SSB #2) from candidate cell #0-2 (see Fig.21 ).

[0277] exist Fig.21 The figure shows the case where SpCell#0, candidate cells #0-1, #0-2 are set in f0, and SCell#1, candidate cells #1-1, #1-2 are set in f1. In addition, the figure shows the case where TCI state ID#3 is set for candidate cell #0-2 (sending SSB#2) through high-layer parameters.

[0278] In this case, when MAC CE at least activates TCI state #3, L1 / L2 cell switching signaling indicates candidate cell #1-1 as the target cell, and indicates TCI state ID #3 as the TCI state, at least one of the following options B-1 to B-2 can also be applied.

[0279] [[Option B-1]]

[0280] The QCL resource RS ID may also be SSB#2 from the candidate cell #1-1. That is, the same resource RS index from the target cell (or candidate cell) may also correspond to the QCL resource RS ID.

[0281] [[Option B-2]]

[0282] The association between candidate cell #0-2 and candidate cell #1-2 can also be set implicitly / explicitly. In this case, for TCI state ID #3, only candidate cell #1-2 can correspond in f1. When the L1 / L2 cell switching signaling indicates candidate cell #1-2 as the target cell and indicates TCI state ID #3 as the TCI state, the QCL resource RS ID becomes SSB #2 from candidate cell #1-2.

[0283] In the case where candidate cells of different frequencies are associated, when a TCI state ID is indicated for a target cell, the TCI state ID of a reference CC (or cell) may also have a resource RS from a cell having a cell ID associated as a target cell.

[0284] <Fourth embodiment>

[0285] In the fourth embodiment, an example of setting synchronization (Sync) and asynchronous (Async) of intra-cell multi-TRP / inter-cell multi-TRP in consideration of L1 / L2 intra-cell mobility (eg, cell switching) is described.

[0286] After Rel.18, it is envisioned that for multi-TRP based on multi-DCI (e.g., mDCI MTRP), the setting of TA for each TRP is supported. Multi-TRP can also support both intra-cell and inter-cell. For example, for multi-TRP operation based on multi-DCI that supports multiple (e.g., 2) TAs, the setting of two timing advance groups (TAGs) belonging to the serving cell is supported.

[0287] In L1 / L2 inter-cell mobility (eg, L1 / L2 inter-cell mobility), different TAGs may be set for the serving cell / the candidate cell.

[0288] In L1 / L2 inter-cell mobility, at least one of intra-cell multiple TRPs (for example, two TRPs share the same PCI) and inter-cell multiple TRPs (for example, two TRPs have different PCIs (similar to Rel.17 / 18's multi-DCI-based multi-TRPs)) can also be supported.

[0289] Fig. 22 An example of multiple TRPs within a cell and multiple TRPs between cells is shown. Here, multiple TRPs (here 2 TRPs) are set in SpCell#0 and SCell#2, and multiple TRPs (here 2 TRPs) are set in the candidate cell corresponding to the same frequency domain as SCell#1. Information related to the serving cell / candidate cell for which multiple TRPs are set can also be set / indicated to the UE from the base station using high-level parameters / MAC CE / DCI, etc.

[0290] In the case of multiple TRPs within a cell, the two TRPs corresponding to each cell may also correspond to two TCI states associated with one PCI. In the case of multiple TRPs between cells, the two TRPs corresponding to different cells may also correspond to two TCI states associated with two PCIs.

[0291] For L1 / L2 inter-cell mobility, at least one of the following options 4-1 to 4-10 may be applied as to the support / setting of intra-cell multi-TRP and inter-cell multi-TRP, and the synchronous / asynchronous setting.

[0292] [Option 4-1]

[0293] The serving cell (eg, SpCell / SCell) may also support the setting of multiple TRPs within the cell (eg, intra-cell MTRP). In addition, for multiple TRPs within the cell, the setting of synchronous / asynchronous (eg, synchronous / asynchronous (sync / async)) may also be supported.

[0294] When multiple TRPs in a cell are set to be synchronized, it can also mean that multiple (for example, 2) TRPs in the cell are synchronized (for example, belonging to the same TAG). When multiple TRPs in a cell are set to be asynchronous, it can also mean that multiple (for example, 2) TRPs in the cell become asynchronous (for example, belonging to different TAGs).

[0295] The setting of multiple TRPs within a cell can also be set from the base station to the UE through high-level parameters, etc. Information related to synchronization / asynchronization between multiple TRPs within a cell (for example, belonging to the same TAG / belonging to different TAGs) can be indicated by either a random access response or an RRC / MAC CE / DCI.

[0296] [Option 4-2]

[0297] The serving cell (eg, SpCell / SCell) may also support the setting of multiple inter-cell TRPs (eg, inter-cell MTRP). In addition, for the multiple inter-cell TRPs, the setting of synchronization / asynchronous (eg, synchronization / asynchronous (sync / async)) may also be supported.

[0298] When synchronization is set for multiple TRPs between cells, it can also mean that multiple (for example, 2) TRPs between cells are synchronized (for example, belong to the same TAG). When asynchronous synchronization is set for multiple TRPs between cells, it can also mean that multiple (for example, 2) TRPs between cells become asynchronous (for example, belong to different TAGs).

[0299] The setting of multiple TRPs between cells can also be set from the base station to the UE through high-level parameters, etc. Information related to synchronization / asynchronization between multiple TRPs between cells (for example, belonging to the same TAG / belonging to different TAGs) can be indicated by either a random access response or an RRC / MAC CE / DCI.

[0300] Both Option 4-1 and Option 4-2 may also be supported. For example, the following scenarios may also be supported: in the case of multiple TRPs within a cell, two TRPs belong to the same TAG, and in the case of multiple TRPs between cells, two TRPs belong to different TAGs.

[0301] [Option 4-3]

[0302] The serving cell (eg, SpCell / SCell) may not support the setting of multiple intra-cell TRPs (eg, intra-cell MTRP). In addition, the setting of synchronous / asynchronous (eg, synchronous / asynchronous (sync / async)) may not be supported for multiple intra-cell TRPs.

[0303] [Option 4-4]

[0304] The serving cell (eg, SpCell / SCell) may not support the setting of inter-cell multi-TRP (eg, inter-cell MTRP). In addition, for inter-cell multi-TRP, the setting of synchronization / asynchronous (eg, synchronization / asynchronous (sync / async)) may not be supported.

[0305] [Option 4-5]

[0306] Option 4-1 to Option 4-4 may also be applied in combination as appropriate. For example, a structure may be set to support both the setting of multiple TRPs within a (synchronous / asynchronous (sync / async)) cell and the setting of multiple TRPs between (synchronous / asynchronous (sync / async)) cells (option 4-1+option 4-2). Alternatively, a structure may be set to support the setting of multiple TRPs within a (synchronous / asynchronous (sync / async)) cell but not support the setting of multiple TRPs between (synchronous / asynchronous (sync / async)) cells (option 4-1+option 4-4). Alternatively, a structure may be set to not support the setting of multiple TRPs within a (synchronous / asynchronous (sync / async)) cell but support the setting of multiple TRPs between (synchronous / asynchronous (sync / async)) cells (option 4-2+option 4-3).

[0307] [Options 4-6]

[0308] The candidate cell may also support the setting of multiple intra-cell TRPs (eg, intra-cell MTRP). In addition, for multiple intra-cell TRPs, the setting of synchronous / asynchronous (eg, synchronous / asynchronous (sync / async)) may also be supported.

[0309] When multiple TRPs in a cell are set to be synchronized, it can also mean that multiple (for example, 2) TRPs in a candidate cell are synchronized (for example, belonging to the same TAG). When multiple TRPs in a cell are set to be asynchronous, it can also mean that multiple (for example, 2) TRPs in a candidate cell become asynchronous (for example, belonging to different TAGs).

[0310] The setting of multiple TRPs within a cell can also be set from the base station to the UE through high-level parameters, etc. Information related to synchronization / asynchronization between multiple TRPs within a candidate cell (for example, belonging to the same TAG / belonging to different TAGs) can be indicated by either a random access response or an RRC / MAC CE / DCI.

[0311] [Options 4-7]

[0312] The candidate cell may also support the setting of inter-cell multi-TRP (eg, inter-cell MTRP). In addition, for inter-cell multi-TRP, the setting of synchronous / asynchronous (eg, synchronous / asynchronous (sync / async)) may also be supported.

[0313] When multiple TRPs between cells are set to be synchronized, it can also mean that multiple (for example, 2) TRPs between candidate cells are synchronized (for example, belonging to the same TAG). When multiple TRPs between cells are set to be asynchronous, it can also mean that multiple (for example, 2) TRPs between candidate cells become asynchronous (for example, belonging to different TAGs).

[0314] The setting of multiple TRPs between cells can also be set from the base station to the UE through high-level parameters, etc. Information related to synchronization / asynchronization between multiple TRPs between candidate cells (for example, belonging to the same TAG / belonging to different TAGs) can be indicated by either a random access response or an RRC / MAC CE / DCI.

[0315] Both options 4-6 and 4-7 may also be supported. For example, the following scenarios may also be supported: in the case of multiple TRPs within a cell, two TRPs within a candidate cell belong to the same TAG, and in the case of multiple TRPs between cells, two TRPs between candidate cells belong to different TAGs.

[0316] [Options 4-8]

[0317] The candidate cell may not support the setting of intra-cell multiple TRPs (eg, intra-cell MTRP). In addition, for intra-cell multiple TRPs, the setting of synchronous / asynchronous (eg, synchronous / asynchronous (sync / async)) may not be supported.

[0318] [Options 4-9]

[0319] The candidate cell may not support the setting of inter-cell multi-TRP (eg, inter-cell MTRP). In addition, for inter-cell multi-TRP, the setting of synchronization / asynchronous (eg, synchronization / asynchronous (sync / async)) may not be supported.

[0320] [Options 4-10]

[0321] Option 4-6 to Option 4-9 may also be applied in combination as appropriate. For example, for candidate cell / cell group switching, a structure may be set to support both the setting of multiple TRPs within a synchronous / asynchronous (sync / async) cell and the setting of multiple TRPs between synchronous / asynchronous (sync / async) cells (option 4-6+option 4-7). Alternatively, for candidate cell / cell group switching, a structure may be set to support the setting of multiple TRPs within a synchronous / asynchronous (sync / async) cell but not support the setting of multiple TRPs between synchronous / asynchronous (sync / async) cells (option 4-6+option 4-9). Alternatively, for candidate cell / cell group switching, a structure may be set to not support the setting of multiple TRPs within a synchronous / asynchronous (sync / async) cell but support the setting of multiple TRPs between synchronous / asynchronous (sync / async) cells (option 4-7+option 4-8).

[0322] [change]

[0323] In options 4-6 to 4-10, it is also possible to distinguish whether the candidate cell is a candidate cell for SpCell switching or a candidate cell for SCell switching. In this case, the presence or absence of intra-cell multi-TRP / inter-cell multi-TRP (or synchronous / asynchronous) settings can also be set separately for the candidate cell corresponding to the SpCell and the candidate cell corresponding to the SCell (or each SCell).

[0324] Alternatively, regarding the candidate cell corresponding to the SpCell and the candidate cell corresponding to the SCell (or each SCell), the presence or absence of setting of intra-cell multi-TRP / inter-cell multi-TRP (or synchronous / asynchronous) may be set in common.

[0325] In Option 4-1 to Option 4-10, only one of synchronization and non-synchronization (e.g., synchronization) may be supported. For example, UE capabilities related to synchronization may be supported as basic UE capabilities, and UE capabilities related to non-synchronization may be supported separately from UE capabilities related to synchronization (or, in addition to UE capabilities related to synchronization).

[0326] <Supplement>

[0327] At least one of the above-mentioned implementation modes may also be applied only to a UE that reports a specific UE capability (UE capability) or supports the specific UE capability.

[0328] The specific UE capability may also indicate at least one of the following:

[0329] ・Support specific UE operations in case of cell handover failure,

[0330] ・Support conflicts between L1 / L2 inter-cell mobility procedures / operations and L3 mobility procedures / operations,

[0331] ・Support intra-frequency cell switching when the TCI state activated by MAC CE is associated with the serving cell / candidate cell corresponding to the same frequency domain,

[0332] ・Supports inter-frequency cell switching when the TCI state activated by MAC CE is associated with the serving cell / candidate cell corresponding to the same frequency domain,

[0333] ・The TCI state activated by the MAC CE is associated with the serving cell / candidate cell corresponding to the different frequency domains, the maximum number of frequency domains in this case, the maximum number of candidate cells, the maximum number of cells per frequency,

[0334] ・Support the setting of multiple TRPs within a cell / multiple TRPs between cells for the serving cell.

[0335] ・Supports the setting of multiple TRPs within a cell / multiple TRPs between cells for candidate cells.

[0336] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied across the entire frequency (commonly regardless of the frequency), or capabilities for each frequency (for example, one or a combination of cells, bands, band combinations, BWPs, component carriers, etc.), or capabilities for each frequency range (for example, frequency range 1 (Frequency Range 1 (FR1)), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities for each subcarrier spacing (SubCarrier Spacing (SCS)), or capabilities for each feature set (Feature Set (FS)) or feature set per component carrier (Feature Set Per Component-carrier (FSPC)).

[0337] Furthermore, the specific UE capability may be a capability applied in all duplex modes (commonly regardless of the duplex mode) or a capability for each duplex mode (eg, time division duplex (TDD) or frequency division duplex (FDD)).

[0338] Furthermore, at least one of the above-mentioned embodiments may also be applied to a case where the UE is configured with specific information associated with the above-mentioned embodiments through higher layer signaling.

[0339] When the UE does not support at least one of the above-mentioned specific UE capabilities or is not configured with the above-mentioned specific information, for example, the operations of Rel.15 / 16 / 17 may also be applied.

[0340] (Note)

[0341] The following inventions are added to one embodiment of the present disclosure.

[0342] [Additional Note 1-1]

[0343] A terminal comprises: a receiving unit, receiving downlink control information including cell switching indication information from a serving cell to a candidate cell and at least one of a MAC CE (MAC Control Element); and a control unit, judging success or failure of switching from the serving cell to the candidate cell based on at least one of sending an ACK (acknowledgement) for the cell switching indication information and receiving a DL transmission from the candidate cell in a specific window or timer period after receiving the cell switching indication information.

[0344] [Additional Notes 1-2]

[0345] A terminal as described in Supplement 1-1, wherein the specific window or timer starts after the ACK is sent or after a specific period after the ACK is sent.

[0346] [Notes 1-3]

[0347] A terminal as described in Note 1-1 or Note 1-2, wherein the control unit determines that the switch from the serving cell to the candidate cell has failed when the control unit is unable to receive DL transmission from the candidate cell during the specific window or timer period / when the random access process is not completed.

[0348] [Notes 1-4]

[0349] A terminal as described in any one of Notes 1-1 to 1-3, wherein the control unit controls the service cell and at least one of the candidate cells to perform a random access process when the switching from the service cell to the candidate cell fails.

[0350] [Additional Note 2-1]

[0351] A terminal comprises: a receiving unit, receiving at least one of first indication information indicating an L1 / L2 inter-cell mobility process and second indication information indicating an L3 mobility process; and a control unit, controlling the L1 / L2 inter-cell mobility process based on the first indication information, and controlling the L3 mobility process based on the second indication information, wherein the control unit performs control so that the L1 / L2 inter-cell mobility process and the L3 mobility process are not performed simultaneously.

[0352] [Additional Note 2-2]

[0353] A terminal as described in Note 2-1, wherein the control unit is assumed to not receive the second indication information when the L1 / L2 inter-cell mobility process is in progress, and is assumed to not receive the first indication information when the L3 mobility process is in progress.

[0354] [Additional Notes 2-3]

[0355] A terminal as described in Note 2-1 or Note 2-2, wherein the control unit gives priority to a specific process when the L1 / L2 inter-cell mobility process and the L3 mobility process conflict.

[0356] [Additional Notes 2-4]

[0357] A terminal as described in any one of Notes 2-1 to 2-3, wherein the control unit gives priority to the later indicated process when the L1 / L2 inter-cell mobility process and the L3 mobility process conflict.

[0358] [Addendum 3-1]

[0359] A terminal comprises: a receiving unit, receiving a MAC CE (MAC Control Element) containing information related to an activation transmission configuration indication (TCI) state, wherein the activation transmission configuration indication (TCI) state is respectively associated with a service cell and one or more candidate cells corresponding to the service cell; and a control unit, judging the TCI state corresponding to the service cell and the TCI state corresponding to the candidate cell based on the MAC CE, wherein the TCI state activated by the MAC CE is at least associated with the candidate cell corresponding to the same frequency domain as the service cell.

[0360] [Additional Note 3-2]

[0361] A terminal as described in Note 3-1, wherein the TCI state activated by the MAC CE is associated with a candidate cell corresponding to the same frequency domain as the serving cell and a candidate cell corresponding to a frequency domain different from the serving cell.

[0362] [Additional Note 3-3]

[0363] A terminal as described in Note 3-1 or Note 3-2, wherein, when multiple service cells are set, an activated TCI state associated with the multiple service cells and at least one of the activated TCI states associated with more than one candidate cell respectively corresponding to the multiple service cells are indicated by one MAC CE.

[0364] [Additional Notes 3-4]

[0365] A terminal as described in any one of Notes 3-1 to 3-3, wherein the control unit determines the TCI state corresponding to the service cell corresponding to other frequency domains and at least one of the candidate cells based on the TCI state ID indicated by the MACCE for the service cell corresponding to a certain frequency domain.

[0366] [Addendum 4-1]

[0367] A terminal comprises: a receiving unit, receiving downlink control information including cell switching indication information from a serving cell to a candidate cell and at least one of a MAC CE (MAC Control Element); and a control unit, controlling a cell switching operation based on the cell switching indication information, wherein at least one of the serving cell and the candidate cell is set with at least one of multiple sending and receiving points within the cell and multiple sending and receiving points between cells.

[0368] [Addendum 4-2]

[0369] A terminal as described in Note 4-1, wherein, when multiple transmission and reception points are set within the cell, multiple transmission and reception points included in the serving cell and at least one of the candidate cells are set to be synchronous or asynchronous.

[0370] [Addendum 4-3]

[0371] A terminal as described in Note 4-1 or Note 4-2, wherein, when multiple transmitting and receiving points are set between cells, at least one of the multiple transmitting and receiving points respectively included in multiple service cells and the multiple transmitting and receiving points respectively included in multiple candidate cells is set to be synchronous or asynchronous.

[0372] [Addendum 4-4]

[0373] A terminal as described in any one of Notes 4-1 to 4-3, wherein, while supporting the setting of multiple transmitting and receiving points within the cell and multiple transmitting and receiving points between cells, it supports that multiple transmitting and receiving points contained in a certain cell are set to the same timing advance group, and multiple transmitting and receiving points respectively contained in different cells are set to different timing advance groups.

[0374] (Wireless Communication System)

[0375] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0376] Fig.23 1 is a diagram showing an example of a schematic structure of a wireless communication system according to an embodiment. The wireless communication system 1 (may also be simply referred to as the system 1) may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5GNR), or the like.

[0377] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0378] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (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.

[0379] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0380] The wireless communication system 1 may also 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 configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0381] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0382] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0383] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0384] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0385] The base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0386] The core network 30 may also include, for example, user plane functions (User Plane Function (UPF)), access and mobility management function (Access and Mobility management Function (AMF)), session management function (Session Management Function (SMF)), unified data management (Unified Data Management (UDM)), application function (Application Function (AF)), data network (Data Network (DN)), location management function (Location Management Function (LMF)), maintenance and operation management (Operation, Administration and Maintenance (OAM))) and other network functions (Network Functions (NF)). In addition, multiple functions can also be provided by one network node. In addition, communication with an external network (for example, the Internet) can also be carried out via the DN.

[0387] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0388] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0389] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0390] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. can also be used.

[0391] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. can also be used as an uplink channel.

[0392] The PDSCH transmits user data, high-layer control information, and system information blocks (SIB). The PUSCH also transmits user data, high-layer control information, and the like. In addition, the PBCH also transmits the master information block (MIB).

[0393] The PDCCH may also transmit lower layer control information. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0394] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0395] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0396] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the terms "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. in the present disclosure may also be rewritten mutually.

[0397] Through PUCCH, uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted. Through PRACH, random access preambles for establishing a connection with a cell can also be transmitted.

[0398] In the present disclosure, downlink, uplink, etc. may be expressed without “link.” In addition, various channels may be expressed without “Physical” at the beginning.

[0399] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (CSI-RS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted as DL-RS.

[0400] 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 also be referred to as SS / PBCH block, SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0401] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may also be transmitted. In addition, DMRS may also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0402] (Base Station)

[0403] Fig.24 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0404] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0405] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0406] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0407] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are explained based on the common knowledge in the technical field involved in the present disclosure.

[0408] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0409] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0410] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0411] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0412] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, to generate a bit string to be sent.

[0413] The transmitting and receiving unit 120 (transmitting processing unit 1211) may also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output a baseband signal.

[0414] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0415] On the other hand, the transmission and reception unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmission and reception antenna 130 .

[0416] The transmitting and receiving unit 120 (receiving processing unit 1212) may also apply receiving processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0417] The transmitting and receiving unit 120 (the measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also 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 also be output to the control unit 110.

[0418] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30 (for example, a network node providing NF), other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0419] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0420] The transmitting and receiving unit 120 may also send at least one of downlink control information including cell switching indication information from the serving cell to the candidate cell and a MAC CE (MAC Control Element) to the terminal. The control unit 110 may also determine the success or failure of the switching from the serving cell to the candidate cell based on an ACK (acknowledgement) for the cell switching indication information sent from the terminal.

[0421] The transmitting and receiving unit 120 may also transmit at least one of first indication information indicating the L1 / L2 inter-cell mobility process and second indication information indicating the L3 mobility process. The control unit 110 may also control the transmission of the first indication information and the second indication information so that the L1 / L2 inter-cell mobility process and the L3 mobility process do not conflict.

[0422] The sending and receiving unit 120 may also send a MAC CE (MAC Control Element) containing information related to the activation of the transmission setting indication (TCI) state, and the activation of the transmission setting indication (TCI) state is associated with the serving cell and one or more candidate cells corresponding to the serving cell. The control unit 110 may also indicate the TCI state corresponding to the serving cell and the TCI state corresponding to the candidate cell based on the MACCE. The TCI state activated by the MAC CE may also be associated with at least the candidate cell corresponding to the same frequency domain as the serving cell.

[0423] The transmitting and receiving unit 120 may also transmit at least one of downlink control information and MAC CE (MAC Control Element) including cell switching indication information from the serving cell to the candidate cell. The control unit 110 may also use the cell switching indication information to indicate the cell switching operation. At least one of the serving cell and the candidate cell may also be set with at least one of multiple transmitting and receiving points within the cell and multiple transmitting and receiving points between cells.

[0424] (User terminal)

[0425] Fig.25 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided with one or more.

[0426] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0427] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0428] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0429] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0430] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0431] The transmitting and receiving antenna 230 can be composed of an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0432] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0433] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0434] The sending and receiving unit 220 (sending processing unit 2211) may also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0435] The transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output a baseband signal.

[0436] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0437] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0438] On the other hand, the transmission and reception unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmission and reception antenna 230 .

[0439] The sending and receiving unit 220 (receiving processing unit 2212) can also apply receiving processing such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0440] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurement, CSI measurement, etc. based on the received signal. The measuring unit 223 may also measure the received power (e.g., RSRP), the received quality (e.g., RSRQ, SINR, SNR), the signal strength (e.g., RSSI), the propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0441] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0442] The sending and receiving unit 220 may also receive at least one of downlink control information and MAC CE (MAC Control Element) including cell switching indication information from the serving cell to the candidate cell. The control unit 210 may also determine the success or failure of the switching from the serving cell to the candidate cell based on at least one of the sending of ACK (acknowledgement) for the cell switching indication information and the reception of DL transmission from the candidate cell during a specific window or timer period after receiving the cell switching indication information. The specific window or timer may also start after the ACK is sent or after a specific period after the ACK is sent. In the case where the DL transmission from the candidate cell cannot be received during the specific window or timer period / the random access process is not completed, the control unit 210 may also determine that the switching from the serving cell to the candidate cell has failed. In the case of a switching failure from the serving cell to the candidate cell, the control unit 210 may also control so that a random access process is performed on at least one of the serving cell and the candidate cell.

[0443] The sending and receiving unit 220 may also receive at least one of first indication information indicating an L1 / L2 inter-cell mobility process and second indication information indicating an L3 mobility process. The control unit 210 may also control the L1 / L2 inter-cell mobility process based on the first indication information and control the L3 mobility process based on the second indication information. The control unit 210 may also control so that (or, assume that) the L1 / L2 inter-cell mobility process and the L3 mobility process are not performed simultaneously. In the case where the L1 / L2 inter-cell mobility process is in progress, the control unit 210 may also assume that the second indication information is not received. In the case where the L3 mobility process is in progress, the control unit 210 may also assume that the first indication information is not received. In the case where the L1 / L2 inter-cell mobility process and the L3 mobility process conflict, the control unit 210 may also prioritize a specific process. In the case where the L1 / L2 inter-cell mobility process and the L3 mobility process conflict, the control unit 210 may also prioritize the process indicated later.

[0444] The transmitting and receiving unit 220 may also receive a MAC CE (MAC Control Element) containing information related to an activation transmission setting indication (TCI) state, which is associated with a serving cell and one or more candidate cells corresponding to the serving cell. The control unit 210 may also determine the TCI state corresponding to the serving cell and the TCI state corresponding to the candidate cell based on the MACCE. The TCI state activated by the MAC CE may also be associated with at least a candidate cell corresponding to the same frequency domain as the serving cell. The TCI state activated by the MAC CE may also be associated with a candidate cell corresponding to the same frequency domain as the serving cell and a candidate cell corresponding to a frequency domain different from the serving cell. In the case of setting multiple serving cells, at least one of the activation TCI states associated with multiple serving cells and the activation TCI states associated with more than one candidate cell corresponding to the multiple serving cells may also be indicated by one MAC CE. The control unit 210 may also determine the TCI state corresponding to at least one of the serving cell and the candidate cell corresponding to other frequency domains based on the TCI state ID indicated by the MAC CE for the serving cell corresponding to a certain frequency domain.

[0445] The transmitting and receiving unit 220 may also receive at least one of downlink control information and MAC CE (MAC Control Element) including cell switching indication information from the serving cell to the candidate cell. The control unit 210 may also control the switching operation of the cell based on the cell switching indication information. The serving cell and at least one of the candidate cells may also be set with at least one of multiple transmitting and receiving points within the cell and multiple transmitting and receiving points between cells. In the case of setting multiple transmitting and receiving points within the cell, the multiple transmitting and receiving points included in at least one of the serving cell and the candidate cell may also be set to be synchronous or asynchronous. In the case of setting multiple transmitting and receiving points between cells, at least one of the multiple transmitting and receiving points respectively included in the multiple serving cells and the multiple transmitting and receiving points respectively included in the multiple candidate cells may also be set to be synchronous or asynchronous. In the case of supporting the setting of both multiple transmitting and receiving points within the cell and multiple transmitting and receiving points between cells, it may also be supported that the multiple transmitting and receiving points included in a certain cell are set to the same timing advance group, and the multiple transmitting and receiving points respectively included in different cells are set to different timing advance groups.

[0446] (Hardware structure)

[0447] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, by wire, wireless, etc.) and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0448] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method thereof is not particularly limited.

[0449] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.26 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0450] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, and unit can be interchanged. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0451] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0452] The functions of the base station 10 and the user terminal 20 are realized by, for example, reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or by controlling at least one of reading and writing data in the memory 1002 and the storage 1003.

[0453] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of 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 control unit 110 (210), the transmission and reception unit 120 (220), etc. described above may also be implemented by the processor 1001.

[0454] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the other functional blocks can also be implemented in the same way.

[0455] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0456] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0457] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0458] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0459] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0460] In addition, the base station 10 and the user terminal 20 may also 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 the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0461] (Variation)

[0462] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may be rewritten one another. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0463] A radio frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0464] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0465] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0466] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0467] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be replaced with each other.

[0468] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0469] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0470] TTI can also be a transmission time unit for a data packet (transport block), code block, code word, etc. that has been channel-coded, and can also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (for example, the number of symbols) to which a transport block, code block, code word, etc. is actually mapped can also be shorter than the TTI.

[0471] In addition, when a time slot or a mini time slot is called a TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) may also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling may also be controlled.

[0472] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also 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 time slot, a sub time slot, a time slot, etc.

[0473] In addition, a long TTI (eg, normal TTI, subframe, etc.) may be rewritten as a TTI having a time length exceeding 1 ms, and a short TTI (eg, shortened TTI, etc.) may be rewritten as a TTI having a TTI length shorter than that of a long TTI and longer than 1 ms.

[0474] Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0475] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0476] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0477] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0478] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) can also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, common RBs can also be identified by the index of the RB based on the common reference point of the carrier. PRBs can also be defined in a BWP and numbered within the BWP.

[0479] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0480] At least one of the configured BWPs may be activated, and the UE may not assume that a specific signal / channel is transmitted or received outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0481] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0482] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0483] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0484] Information, signals, etc. described in the present disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0485] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0486] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or added. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0487] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high-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.

[0488] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0489] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0490] The determination may be made using a value represented by one bit (0 or 1), a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(eg, comparison with a specific value).

[0491] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software module, application, software application, software package, routine, sub-routine, object, executable files, execution thread, procedure, function, etc.

[0492] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when the software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0493] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0494] 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", "transmit power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0495] In the present disclosure, terms such as "base station (BS)", "wireless 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", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro cell, and pico cell.

[0496] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that performs communication services within the coverage area.

[0497] In the present disclosure, the fact that the base station sends information to the terminal may also be mutually rewritten with the fact that the base station instructs the terminal to control / operate based on the information.

[0498] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0499] There are also instances where a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client or some other appropriate terminology.

[0500] At least one of the base station and the mobile station may also be referred to as a transmission device, a reception device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a moving object, a moving object body, etc.

[0501] The mobile body refers to a movable object, and the moving speed is arbitrary, including the case where the mobile body is stopped. The mobile body includes, for example, vehicles, transport vehicles, cars, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, carts, rickshaws, ships (ships and other watercraft), airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, hot air balloons, and objects carried on them, but is not limited to these. In addition, the mobile body can also be a mobile body that drives autonomously based on operating instructions.

[0502] The mobile object may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile object that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, 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 also be an Internet of Things (IoT) device such as a sensor.

[0503] Fig. 271 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0504] The driving unit 41 is composed of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is composed of at least a steering wheel (also called a handle), and steers at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0505] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an electronic control unit (Electronic Control Unit (ECU)).

[0506] As signals from various sensors 50-58, there are the following signals, etc.: a current signal from a current sensor 50 for sensing the current of a motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by a speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of an accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of a brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of a shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0507] The information service unit 59 is composed of various devices for providing (outputting) various information such as driving information, traffic information, entertainment information, etc., such as a navigation system, an audio system, a speaker, a display, a television, and a radio, and one or more ECUs for controlling these devices. The information service unit 59 provides various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40 using information acquired from an external device via the communication module 60, etc.

[0508] The information service unit 59 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0509] The driving assistance system unit 64 is composed of various devices for providing functions for preventing accidents before they happen or reducing the driver's driving burden, such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning detector (for example, Global Navigation Satellite System (GNSS)), map information (for example, High Definition (HD) map, Autonomous Vehicle (AV) map, etc.), gyroscope system (for example, inertial measurement unit (Inertial Measurement Unit (IMU)), inertial navigation unit (Inertial Navigation System (INS)), etc.), artificial intelligence (AI) chip, AI processor, and one or more ECUs for controlling these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 to realize the driving assistance function or the automatic driving function.

[0510] The communication module 60 can communicate with the microprocessor 61 and the structural elements of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40 via the communication port 63.

[0511] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device that can communicate with an external device. For example, various information is sent and received with the external device via wireless communication. The communication module 60 can be inside or outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it can also function as at least one of the base station 10 and user terminal 20).

[0512] The communication module 60 may also transmit at least one of the signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted by the communication module 60 may also include information based on the above input.

[0513] The communication module 60 receives various information (traffic information, signal information, vehicle information, etc.) transmitted from an external device, and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 may also be referred to as an output unit that outputs information (for example, outputs information to a display, a speaker, etc. based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0514] In addition, the communication module 60 stores various information received from the external device in the memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the various sensors 50-58, etc., which are provided in the vehicle 40.

[0515] In addition, the base station in the present disclosure may also be rewritten as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be rewritten as terms corresponding to inter-terminal communication (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0516] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0517] In the present disclosure, operations are assumed to be performed by a base station, and sometimes by its upper node depending on the situation. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal can obviously be performed by a 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 to these), or a combination thereof.

[0518] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, timings, flow charts, etc. of the various methods / implementations described in this disclosure may be swapped in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0519] The various modes / implementations described in the present disclosure may be applied to 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), systems using other appropriate wireless communication methods, and next-generation systems that are extended, modified, generated, or specified based on them. In addition, multiple systems can also be combined (for example, LTE or LTE-A, combination with 5G, etc.) for application.

[0520] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0521] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0522] The term "determining" used in this disclosure may include a variety of operations. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are regarded as performing "determining".

[0523] In addition, “judgment (decision)” may also refer to situations where receiving (e.g., receiving information), transmitting (e.g., sending information), input (input), output (output), accessing (e.g., accessing data in a memory), etc. are regarded as making a “judgment (decision)”.

[0524] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as "judgment (decision)". That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as "judgment (decision)".

[0525] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0526] The “maximum transmit power” described in the present disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0527] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be rewritten as "access".

[0528] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-inclusive examples, being "connected" or "combined" to each other using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc.

[0529] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0530] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0531] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0532] In the present disclosure, “below”, “less than”, “above”, “more than”, “equal to”, etc. may be rephrased with each other. Furthermore, in the present disclosure, terms meaning “good”, “bad”, “big”, “small”, “high”, “low”, “early”, “late”, “wide”, “narrow”, etc. are not limited to the original comparative and superlative levels, but may be rephrased with each other. Furthermore, in the present disclosure, terms meaning “good”, “bad”, “big”, “small”, “high”, “low”, “early”, “late”, “wide”, “narrow”, etc. as expressions with “ith” (i is an arbitrary integer) may also be rephrased with each other (for example, “highest” may also be rephrased with “i-th highest”).

[0533] In the present disclosure, “of,” “for,” “regarding,” “related to,” “associated with,” etc. may also be replaced by each other.

[0534] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: a receiving unit, receiving downlink control information including cell switching indication information from a serving cell to a candidate cell and at least one of a MAC control element (MAC CE); and A control unit controls a switching operation of a cell based on the cell switching indication information, At least one of the serving cell and the candidate cell is set with at least one of multiple transmission and reception points within the cell and multiple transmission and reception points between cells.

2. The terminal according to claim 1, wherein: When multiple transmission and reception points are set within the cell, a plurality of transmission and reception points included in at least one of the serving cell and the candidate cell are set to be synchronized or asynchronous.

3. The terminal according to claim 1, wherein: When the multiple transmission and reception points between cells are set, at least one of the multiple transmission and reception points respectively included in the multiple serving cells and the multiple transmission and reception points respectively included in the multiple candidate cells is set to be synchronous or asynchronous.

4. The terminal according to claim 1, wherein: While supporting the settings of multiple transmitting and receiving points within the cell and multiple transmitting and receiving points between cells, it is supported that multiple transmitting and receiving points contained in a certain cell are set in the same timing advance group, and multiple transmitting and receiving points contained in different cells are set in different timing advance groups.

5. A wireless communication method of a terminal, comprising: The step of receiving downlink control information including cell switching indication information from a serving cell to a candidate cell and at least one of a MAC control element (MAC CE); and Based on the cell switching indication information, a step of controlling a cell switching operation, At least one of the serving cell and the candidate cell is set with at least one of multiple transmission and reception points within the cell and multiple transmission and reception points between cells.

6. A base station, comprising: a sending unit, configured to send downlink control information including cell switching indication information from a serving cell to a candidate cell and at least one of a MAC control element (MAC CE); and The control unit uses the cell switching indication information to indicate a cell switching operation. At least one of the serving cell and the candidate cell is set with at least one of multiple transmission and reception points within the cell and multiple transmission and reception points between cells.

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