WO2024057525A1

WO2024057525A1 - Terminal, wireless communication method, and base station

Info

Publication number: WO2024057525A1
Application number: PCT/JP2022/034740
Authority: WO
Inventors: 祐輝松村; 守奥村; 聡永田; ジンワン; ランチン
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2022-09-16
Filing date: 2022-09-16
Publication date: 2024-03-21

Abstract

A terminal according to an aspect of the present disclosure includes: a reception unit that receives at least one of first instruction information instructing an L1/L2 inter-cell mobility procedure or second instruction information instructing an L3 mobility procedure; and a control unit that controls the L1/L2 inter-cell mobility procedure on the basis of the first instruction information and controls the L3 mobility procedure on the basis of the second instruction information, wherein the control unit applies such control that the L1/L2 inter-cell mobility procedure and the L3 mobility procedure are not performed at the same time.

Description

Terminal, wireless communication method and base station

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

In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of higher data rates, lower delays, etc. (Non-Patent Document 1). Additionally, LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Releases (Rel.) 8 and 9).

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

In future wireless communication systems (e.g., wireless communication systems after Rel. 16/5G), inter-cell mobility, including non-serving cells, or multiple transmission/reception points (e.g. , it is assumed that communication is controlled based on inter-cell mobility using Multi-TRP (MTRP).

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

The present disclosure has been made in view of these points, and one of the objectives is to provide a terminal, a wireless communication method, and a base station that can appropriately control communication even when performing inter-cell mobility. Let's do one.

A terminal according to an aspect of the present disclosure includes a receiving unit that receives at least one of first instruction information that instructs an L1/L2 inter-cell mobility procedure and second instruction information that instructs an L3 mobility procedure. , a control unit that controls the L1/L2 inter-cell mobility procedure based on the first instruction information and controls the L3 mobility procedure based on the second instruction information, the control unit , the L1/L2 inter-cell mobility procedure and the L3 mobility procedure are controlled not to be performed simultaneously.

According to one aspect of the present disclosure, communication can be appropriately controlled even when performing inter-cell mobility.

FIGS. 1A and 1B are diagrams illustrating an example of inter-cell mobility. FIG. 2 is a diagram illustrating an example of switching between a serving cell and an additional cell using L1/L2 signaling. FIG. 3 is a diagram illustrating an example of setting example 1-3 when candidate cells are supported. FIGS. 4A to 4C are diagrams illustrating an example in which candidate cells/candidate cell groups are switched by L1/L2 signaling in setting example 1-3 in which candidate cells are supported. FIG. 5 is a diagram illustrating an example of a timing advance group (TAG) to which cells included in a cell group belong. FIG. 6 is a diagram illustrating an example of a MAC CE for timing advance commands. FIGS. 7A and 7B are diagrams illustrating an example of TAG IDs set in a serving cell and a candidate cell. FIG. 8 is a diagram illustrating an example of a case where the L1/L2 inter-cell mobility according to the first embodiment is successful. FIG. 9 is a diagram illustrating another example in which the L1/L2 inter-cell mobility according to the first embodiment is successful. FIG. 10 is a diagram illustrating an example of a case where mobility between L1/L2 cells according to the first embodiment fails. FIG. 11 is a diagram illustrating another example of a case in which the L1/L2 inter-cell mobility according to the first embodiment fails. 12A and 12B are diagrams illustrating an example of application of L1/L2 inter-cell mobility and L3 mobility according to the second embodiment. 13A and 13B are diagrams showing other examples of application of L1/L2 inter-cell mobility and L3 mobility according to the second embodiment. FIG. 14 is a diagram illustrating an example of activation of TCI states for a serving cell and a candidate cell that are set to the same frequency. FIG. 15 is a diagram illustrating an example of activation of TCI states of a serving cell and a candidate cell according to the third embodiment. FIG. 16 is a diagram illustrating an example of cell switching between frequencies according to the third embodiment. FIG. 17 is a diagram illustrating another example of activation of the TCI states of a serving cell and a candidate cell according to the third embodiment. FIG. 18 is a diagram illustrating another example of activation of the TCI states of a serving cell and a candidate cell according to the third embodiment. FIG. 19 is a diagram illustrating another example of activation of TCI states of a serving cell and a candidate cell according to the third embodiment. FIG. 20 is a diagram for explaining setting example #1 according to the third embodiment. FIG. 21 is a diagram for explaining setting example #2 according to the third embodiment. FIG. 22 is a diagram illustrating an example of intra-cell multi-TRP settings and inter-cell multi-TRP settings for serving cells/candidate cells according to the fourth embodiment. FIG. 23 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 24 is a diagram illustrating an example of the configuration of a base station according to an embodiment. FIG. 25 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. FIG. 26 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. FIG. 27 is a diagram illustrating an example of a vehicle according to an embodiment.

(TCI, spatial relations, QCL)
In NR, the UE performs reception processing (e.g., reception, demapping, demodulation, Controlling at least one of decoding), transmission processing (eg, at least one of transmission, mapping, precoding, modulation, and encoding) is being considered.

The TCI states may represent those that apply to downlink signals/channels. What corresponds to the TCI state applied to uplink signals/channels may be expressed as a spatial relation.

The TCI state is information regarding quasi-co-location (QCL) of signals/channels, and may also be called spatial reception parameters, spatial relation information, etc. The TCI state may be set in the UE on a per-channel or per-signal basis.

QCL is an index that indicates the statistical properties of a signal/channel. For example, when one signal/channel and another signal/channel have a QCL relationship, the Doppler shift, Doppler spread, and average delay are calculated between these different signals/channels. ), delay spread, and spatial parameters (e.g., spatial Rx parameters) can be assumed to be the same (QCL with respect to at least one of these). You may.

Note that the spatial reception parameters may correspond to the UE's reception beam (eg, reception analog beam), and the beam may be identified based on the spatial QCL. QCL (or at least one element of QCL) in the present disclosure may be read as sQCL (spatial QCL).

A plurality of types (QCL types) may be defined for QCL. For example, four QCL types A-D may be provided with different parameters (or parameter sets) that can be assumed to be the same, and the parameters (which may be referred to as QCL parameters) are shown below:
・QCL type A (QCL-A): Doppler shift, Doppler spread, average delay and delay spread,
・QCL type B (QCL-B): Doppler shift and Doppler spread,
・QCL type C (QCL-C): Doppler shift and average delay,
- QCL type D (QCL-D): Spatial reception parameters.

For the UE to assume that one Control Resource Set (CORESET), channel or reference signal is in a particular QCL (e.g. QCL type D) relationship with another CORESET, channel or reference signal, It may also be called a QCL assumption.

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

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

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

The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), or the like. Broadcast information includes, for example, a master information block (MIB), a system information block (SIB), a minimum system information (RMSI), and other system information ( Other System Information (OSI)) may also be used.

The physical layer signaling may be, for example, downlink control information (DCI).

Note that the channel/signal to which the TCI state is applied may also be referred to as a target channel/reference signal (target channel/RS), or simply a target, and the other signals mentioned above may be referred to as a reference reference signal (reference RS), source It may also be called RS (source RS) or simply reference.

Channels for which TCI states or spatial relationships are set (designated) are, for example, the Physical Downlink Shared Channel (PDSCH), the Physical Downlink Control Channel (PDCCH), and the Uplink Shared Channel (PDSCH). The channel may be at least one of a Physical Uplink Shared Channel (PUSCH) and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

In addition, the RS that has a QCL relationship with the channel is, for example, a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a measurement reference signal (Sounding Reference Signal (SRS)), tracking CSI-RS (also called Tracking Reference Signal (TRS)), QCL detection reference signal (also called QRS), demodulation reference signal (DeModulation Reference Signal (DMRS)), etc. It may be one.

The SSB is a signal block that includes at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). SSB may be called SS/PBCH block.

An RS of QCL type X in a TCI state may mean an RS that has a QCL type You can.

(intercell mobility)
In NR, it is being considered that one or more transmission/reception points (TRPs) (Multi-TRPs (MTRPs)) perform DL transmission to UEs. Further, it is being considered that the UE performs UL transmission for one or more TRPs.

It is conceivable that the UE receives channels/signals from multiple cells/TRPs in inter-cell mobility (eg, L1/L2 inter-cell mobility) (see FIGS. 1A, B).

FIG. 1A shows an example of inter-cell mobility (for example, Single-TRP inter-cell mobility) including non-serving cells. The UE may be configured with one TRP (or single TRP) in each cell. Here, the UE receives channels/signals from the base station/TRP of cell #1, which is the serving cell, and the base station/TRP of cell #3, which is not the serving cell (non-serving cell). It shows. For example, this corresponds to the case where the UE switches/switches from cell #1 to cell #3 (for example, fast cell switch).

In this case, port (for example, antenna port)/TRP selection may be performed dynamically. This may be done based on port (eg, antenna port)/TRP selection or TCI status indicated or updated by the DCI/MAC CE. Here, a case is shown in which different physical cell ID (for example, PCI) settings are supported for cell #1 and cell #3.

FIG. 1B shows an example of a multi-TRP scenario (for example, multi-TRP inter-cell mobility when using multi-TRP). The UE may be configured with multiple (eg, two) TRPs (or different CORESET pool indices) in each cell. Here, a case is shown in which the UE receives channels/signals from TRP #1 and TRP2. Further, here, a case is shown in which TRP #1 corresponds to physical cell ID (PCI) #1 and TRP #2 corresponds to PCI #2.

The multi-TRPs (TRP #1, #2) may be connected by an ideal/non-ideal backhaul, and information, data, etc. may be exchanged. The same or different code words (CWs) and the same or different layers may be transmitted from each TRP of the multi-TRP. As one form of multi-TRP transmission, non-coherent joint transmission (NCJT) may be used, as shown in FIG. 1B. Here, a case is shown in which NCJT is performed between TPRs corresponding to different PCIs. Note that the same serving cell configuration may be applied/configured for TRP #1 and TRP #2.

The multiple PDSCHs (multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping in at least one of the time and frequency domains. That is, the first PDSCH from TRP#1 and the second PDSCH from TRP#2 may overlap in at least one of the time and frequency resources. The first PDSCH and the second PDSCH may be used to transmit the same TB or different TBs.

These first PDSCH and second PDSCH may be assumed not to be in a quasi-co-location (QCL) relationship. Reception of multiple PDSCHs may also be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (for example, QCL type D).

Multiple PDSCHs from multiple TRPs (may be referred to as multiple PDSCHs) may be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single master mode). ). One DCI may be transmitted from one TRP of multiple TRPs. A configuration that uses one DCI in multi-TRP may be called single DCI-based multi-TRP (mTRP/MTRP).

Multiple PDSCHs from multiple TRPs may be scheduled using multiple DCIs (multiple DCI (M-DCI), multiple PDCCH (multiple PDCCH)) (multimaster mode). A plurality of DCIs may be transmitted from multiple TRPs. A configuration that uses multiple DCIs in multi-TRP may be referred to as multi-DCI-based multi-TRP (mTRP/MTRP).

It may be assumed that the UE sends separate CSI reports for each TRP for different TRPs. Such CSI feedback may be called separate feedback, separate CSI feedback, or the like. In the present disclosure, "separate" may be mutually read as "independent."

Rel. In 17 NR, it is assumed that the MAC CE/DCI supports beam direction to TCI states associated with different PCIs. On the other hand, Rel. After 18 NR, it is assumed that serving cell switching (e.g., instruction to change the serving cell to a cell with a different PCI) will be supported by L1/L2 signaling (e.g., DCI/MAC CE) (see Figure 2). .

FIG. 2 shows a case in which a UE switches cells from a serving cell to an additional cell (also referred to as a candidate cell or target cell) based on a cell switching instruction from a base station.

(Candidate cell)
In inter-cell mobility, it is also assumed that one or more candidate cells are configured/managed for each serving cell.

For example, one or more candidate cells with limited information (for example, only some parameters are notified to the UE) may be configured in a predetermined upper layer parameter (for example, ServingCellConfig) (Alt. 1). It may be set similarly to inter-cell beam management (inter-cell BM) of existing systems (for example, Rel. 17).

Alternatively, a complete configuration (eg, ServingCellConfig) of one or more candidate cells may be configured, and the candidate cell may be associated with each serving cell (Alt. 2). For example, a carrier aggregation configuration framework (eg, CA configuration framework) or a CHO (Conditional Handover)/CPC (Conditional PSCell Change) configuration framework may be reused.

Alt. In 1/2, activation/deactivation of candidate cells may be controlled by MAC CE/DCI.

As the candidate cell settings, at least one of the following Setting Examples 1 to 3 may be applied (see FIG. 3). Here, SpCell #0, SCell #1, and SCell #2 are configured as serving cells, and an example of configuration/association of candidate cells (or additional cells) with respect to the serving cell/cell group is shown. Setting examples 1 to 3 below are just examples, and the number of cells, association of each cell, etc. are not limited to these and may be changed as appropriate. Alternatively, other setting examples may be supported/applied in addition to/in place of setting examples 1 to 3.

Configuration example 1 shows a case where one or more candidate cells are associated/configured with each serving cell (see FIG. 3). Specifically, candidate cells #0-1, #0-2, #0-3 are associated with SpCell #0, candidate cells #1-1 are associated with SCell #1, and candidate cells #1-1 are associated with SCell #2. A case is shown in which candidate cells #2-1 and #2-2 are associated with. Information regarding the association may be set/instructed from the base station to the UE by RRC/MAC CE/DCI.

Configuration example 2 shows a case where a candidate cell is associated/configured with a MAC entity/MCG/SCG (see FIG. 3). Specifically, a case is shown in which candidate cells #3 to #8 are associated with a MAC entity/MCG/SCG. In this case, candidate cells are configured for MAC entities or cell groups (eg, MCG/SCG) rather than being associated with each serving cell. Information regarding candidate cells configured in each cell may be configured/instructed from the base station to the UE by RRC/MAC CE/DCI.

In setting example 3, one or more candidate cell groups may be set (see FIG. 3). Specifically, candidate cell group #1 having candidate cells #0 to #2, candidate cell group #2 having candidate cells #0 and #1, and candidate cell group #3 having candidate cell #0 are set. It shows the case. A candidate cell group has one or more candidate cells. Candidate cells included in the candidate cell group may be associated with at least one serving cell. Information regarding candidate cells may be set/instructed from the base station to the UE using RRC/MAC CE/DCI.

Existing systems (eg, Rel. 17) support L1 beam indication (eg, indication by the TCI status field of the DCI) to the TCI status associated with the additional PCI (or additional cell).

Rel. 18 and later, it is assumed that new L1/L2 signals (eg, DCI/MAC CE) that instruct serving cell switching (eg, serving cell switch) will be supported. It is assumed that at least one of an implicit instruction and an explicit instruction is supported as the instruction. The implicit indication may, for example, mean that a certain CORESET is updated to the TCI state associated with additional PCIs by the MAC CE. An explicit instruction may mean that cell switching is directly instructed by the DCI/MAC CE.

For example, in candidate cell configuration example 1, a predetermined candidate cell may be designated as the serving cell (or switching with the serving cell may be instructed) via L1/L2 signaling. FIG. 4A shows a case where candidate cell #0-2 becomes SpCell of MCG/SCG (SpCell #0 and candidate cell #0-2 are switched) by L1/L2 signaling. Furthermore, a case is shown in which candidate cell #2-1 becomes an MCG/SCG SCell (SCell #2 and candidate cell #2-1 are switched) by L1/L2 signaling.

Alternatively, in candidate cell configuration example 2, a predetermined candidate cell may be designated as the serving cell (or switching with the serving cell may be instructed) via L1/L2 signaling. FIG. 4B shows a case where candidate cell #4 becomes SpCell of MCG/SCG (SpCell #0 and candidate cell #4 are switched) by L1/L2 signaling.

Alternatively, in candidate cell configuration example 3, a predetermined candidate cell group (or one or more candidate cells included in the predetermined candidate cell group) is changed/updated to a serving cell group via L1/L2 signaling. Good too. In FIG. 4C, candidate cell group #1 (or candidate cells #0 to #2 included in candidate cell group #1) becomes the serving cell group due to L1/L2 signaling (the serving cell group and candidate cell group #1 are switched Indicates the case where the

(Timing Advance Group)
When using multiple TRPs, there may be cases where the distances between the UE and each TRP are different. Multiple TRPs may be included in the same cell (eg, serving cell). Alternatively, among a plurality of TRPs, a certain TRP may correspond to a serving cell, and other TRPs may correspond to non-serving cells. In this case, it is also assumed that the distances between each TRP and the UE are different.

In existing systems, the transmission timing of an UL (Uplink) channel and/or a UL signal (UL channel/signal) is adjusted by a timing advance (TA). The reception timing of UL channels/signals from different user terminals (UE) is adjusted on the radio base station (TRP: Transmission and Reception Point, gNB: gNodeB, etc.) side.

The UE may control the timing of UL transmission by applying timing advances (multiple timing advances) to each timing advance group (TAG) set in advance.

When applying multiple timing advances, support timing advance groups (TAGs) classified by transmission timing. The UE may control the UL transmission timing in each TAG assuming that the same TA offset (or TA value) is applied for each TAG. That is, the TA offset may be set independently for each TAG.

When multiple timing advance is applied, the UE independently adjusts the transmission timing of cells belonging to each TAG, so that even when multiple cells are used, the radio base station receives uplink signal reception timing from the UE. can be matched.

The TAG (for example, serving cells belonging to the same TAG) may be configured by upper layer parameters. The same timing advance value may be applied to serving cells belonging to the same TAG (for example, serving cells to which UL is configured). A timing advance group including the MAC entity SpCell may be referred to as a primary timing advance group (PTAG), and other TAGs may be referred to as a secondary timing advance group (STAG). Additionally, the maximum number of TAGs may be X (eg, X=4) for each cell group (eg, MCG/SCG).

In existing systems (eg, Rel. 16 NR), the configuration of up to 4 TAGs per cell group (eg, MCG/SCG) is supported (see FIG. 5). FIG. 5 shows a case where three TAGs are set for a cell group including SpCell and SCells #1 to #4. Here, 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. This shows the case where it belongs to TAG (TAG #2).

A timing advance command (TA command) may be notified to the UE using a MAC control element (for example, MAC CE). The TA command is a command indicating an uplink channel transmission timing value, and is included in the MAC control element. The TA command is signaled from the radio base station to the UE at the MAC layer. The UE controls a predetermined timer (eg, TA timer) based on reception of the TA command.

The MAC CE for timing advance commands may include a field for timing advance group index (eg, TAG ID) and a field for timing advance commands (see FIG. 6). The TAG ID field is used to indicate the TAG ID of the addressed TAG. The field of the timing advance command may indicate an index value T _A (0, 1, 2...63) that is utilized to control the amount of timing adjustment that the MAC entity must apply.

The parameters corresponding to each TAG ID may be set by upper layer parameters. For example, parameters such as a time alignment timer (for example, timeAlignmentTimer) that corresponds to each TAG ID may be set. Alternatively, the TAG ID may be set for each serving cell by an upper layer parameter (for example, tag-ID included in ServingCellConfig). Note that the TAG ID/parameter may be updated by the MAC CE after being set using the upper layer parameters.

A time alignment timer may be maintained for UL time alignment. Rel. At 17, a time alignment timer may be set/associated for each TAG. When the UE receives a MAC CE for a timing advance command (e.g., TAC MAC CE), the UE starts or restarts the time alignment timer respectively associated with the indicated timing advance group (e.g., TAG).

If the MAC entity receives the TAC MAC CE and maintains a predetermined value (N _TA ) with the indicated TAG, the MAC entity applies a timing advance command for the indicated TAG, or Start or restart the time alignment timer associated with the TAG. The predetermined value (N _TA ) may be a timing advance between DL and UL.

The operation when the time alignment timer expires may be defined separately in PTAG and STAG. Note that a timing advance group (TAG) including the MAC entity SpCell may be referred to as a primary timing advance group (PTAG), and other TAGs may be referred to as a secondary timing advance group (STAG).

For example, Rel. In 17, it is supported that when a timing advance timer corresponding to a PTAG expires, a predetermined operation for PTAG is applied, and when a timing advance timer corresponding to a STAG expires, a predetermined operation for STAG is applied. There is.

For example, when the time alignment timer expires, the following operations (eg, predetermined PTAG operation/predetermined STAG operation) may be performed.

[Predetermined PTAG operation]
If the time alignment timer is associated with PTAG,
- Flush all HARQ buffers of all serving cells.
- If configured, notify RRC to release PUCCH for all serving cells.
- If set, notify RRC to release SRS.
- Clear all set DL assignments and set UL assignments.
- Clear the PUSCH resource for semi-persistent CSI reporting.
・Let all time alignment timers expire while running.
- Maintain _NTA for all TAGs.

[Predetermined STAG operation]
When a time alignment timer is associated with a STAG, for all serving cells belonging to the TAG,
- Flush all HARQ buffers.
- If set, notify RRC to release PUCCH.
- If set, notify RRC to release SRS.
- Clear all set DL assignments and UL assignments.
- Clear the PUSCH resource for semi-persistent CSI reporting.
- Maintain the _NTA of the TAG.

As described above, when candidate cells are set/defined, it is assumed that each candidate cell is associated with a TAG (see FIGS. 7A and 7B). FIG. 7A shows an example of TAG (or TAG ID setting) for each cell group in an existing system (for example, before Rel. 17), and FIG. 7B shows an example of TAG ID setting for each candidate cell. There is.

Additionally, when candidate cells are configured/applied/supported, it is assumed that different serving cells/different candidate cells are associated with the same TAG, as shown in FIG. 7B.

When obtaining the TA of a candidate cell, RACH (or random access procedure) to the candidate cell may be supported.

Thus, when candidate cells are configured/applied/supported, it is assumed that inter-cell mobility (e.g. switching/switching from the serving cell to the candidate cell (or additional cell/target cell)) will take place. , how to control such cases has not been sufficiently studied. If switching between a serving cell and a candidate cell (for example, inter-cell mobility) is not performed appropriately, communication quality may deteriorate.

The present inventors focused on inter-cell mobility (e.g. cell switching) when a candidate cell (or additional cell, target cell) is configured/supported, and studied an appropriate control method for the inter-cell mobility. and came up with the idea of this embodiment.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Note that each of the following aspects (for example, each case) may be used alone, or may be applied in combination of at least two.

In the present disclosure, "A/B" and "at least one of A and B" may be read interchangeably. Furthermore, in the present disclosure, "A/B/C" may mean "at least one of A, B, and C."

In the present disclosure, "activate", "deactivate", "indicate", "select", "configure", "update", "determine", etc. may be used interchangeably. In this disclosure, supporting, controlling, being able to control, operating, capable of operating, etc. may be read interchangeably.

In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, upper layer parameters, information elements (IEs), settings, etc. may be read interchangeably. In the present disclosure, the terms Medium Access Control Element (CE), update command, activation/deactivation command, etc. may be read interchangeably.

In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), or the like. Broadcast information includes, for example, a master information block (MIB), a system information block (SIB), a minimum system information (RMSI), and other system information ( Other System Information (OSI)) may also be used.

In the present disclosure, the physical layer signaling may be, for example, downlink control information (DCI), uplink control information (UCI), etc.

In this disclosure, an index, an identifier (ID), an indicator, a resource ID, etc. may be read interchangeably. In this disclosure, sequences, lists, sets, groups, groups, clusters, subsets, etc. may be used interchangeably.

In this disclosure, a panel, a UE panel, a panel group, a beam, a beam group, a precoder, an uplink (UL) transmitting entity, a transmission/reception point (TRP), a base station, and a spatial relation information (SRI) are described. )), spatial relationship, SRS resource indicator (SRI), control resource set (CONtrol REsource SET (CORESET)), Physical Downlink Shared Channel (PDSCH), codeword (CW), transport Block (Transport Block (TB)), reference signal (RS), antenna port (e.g. demodulation reference signal (DMRS) port), antenna port group (e.g. DMRS port group), groups (e.g., spatial relationship groups, Code Division Multiplexing (CDM) groups, reference signal groups, CORESET groups, Physical Uplink Control Channel (PUCCH) groups, PUCCH resource groups), resources (e.g., reference signal resources, SRS resource), resource set (for example, reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI Unified TCI state, common TCI state, quasi-co-location (QCL), QCL assumption, etc. may be read interchangeably.

Additionally, the spatial relationship information identifier (ID) (TCI status ID) and the spatial relationship information (TCI status) may be read interchangeably. “Spatial relationship information” may be interchangeably read as “a set of spatial relationship information”, “one or more pieces of spatial relationship information”, etc. TCI status and TCI may be read interchangeably.

In the following embodiments, "plurality" and "two" may be read interchangeably. Furthermore, "TAG" and "TAG ID" may be read interchangeably. Further, "cell", "CC", and "carrier" may be read interchangeably.

The following description may be applied to inter-cell mobility (for example, L1/L2 inter-cell mobility), or may be applied to communication control other than inter-cell mobility. L1/L2 inter-cell mobility may be read as at least one of cell switching, cell switching, and cell changing.

(Wireless communication method)
<First embodiment>
In the first embodiment, an example of UE operation/base station operation when (or after receiving) a cell switching instruction will be described.

The base station may set information regarding the configuration of multiple candidate cells to the UE through upper layer signaling. The upper layer signaling may be RRC reconfiguration signaling, a cell-related upper layer parameter, or another upper layer parameter.

Additionally, the base station may use the MAC CE/DCI to instruct the UE to change or switch the serving cell. The UE performs a cell switching procedure/switching operation based on a cell switching instruction instructed by the MAC CE/DCI. The cell switching indication may be referred to as cell switching indication signaling or L1/L2 intercell mobility indication.

The MAC CE/DCI includes at least one of information regarding the candidate cell to be the switching destination (for example, candidate cell index or physical cell ID (PCI)), information regarding the serving cell to be the switching source, and information regarding other candidate cells. You may be

In the present disclosure, serving cell change may be read as serving cell switching, serving cell switching, or L1/L2 cell switch (for example, L1/L2 cell switch). In the present disclosure, instructing a serving cell change may be read as activating/validating a serving cell change.

The UE may assume that L1/L2 intercell mobility is enabled when a serving cell change is instructed.

When the UE receives information instructing to change the serving cell (or change to a candidate cell), the UE changes the serving cell configuration to the target cell (or candidate cell) based on the cell configuration preset by upper layer parameters. May be changed. The UE may receive DL transmissions from the target cell assuming new beam/TCI states/spatial relationships. Information regarding the new beam/TCI state/spatial relationship may be configured/instructed from the base station to the UE in advance using higher layer parameters (eg, higher layer parameters related to candidate cells).

If no information regarding a new beam/TCI state/spatial relationship is set/indicated, the UE may assume a predetermined beam/TCI state/spatial relationship. The predetermined beam/TCI state/spatial relationship may be determined based on the target cell's (or candidate cell's) PRACH transmission. For example, the UE may determine/assume a certain beam/TCI state/spatial relationship based on the latest PRACH transmission associated with the target cell's SSB.

In addition, when the UE detects a MAC CE/DCI that instructs a change in the serving cell (or a change to a candidate cell), the UE updates the RRC settings of the cell to be updated (for example, the RRC settings of the candidate cell) after a predetermined period. You may change to the configured serving cell. In the present disclosure, the predetermined period may be read as a predetermined offset.

The predetermined period may be Xms or X symbols after the detected MAC CE/DCI. Alternatively, the predetermined period may be Yms/Y symbols after the HARQ-ACK feedback for the detected MAC CE/DCI. X and Y may be determined based on the UE capability/UE type, may be defined in specifications, or may be set from the base station to the UE.

In this way, when cell switching (for example, L1/L2 intercell mobility) is successful, it is possible to control transmission and reception operations using the target cell as the serving cell. In this case, success/failure of cell switching may be defined as follows. Option 1A-1 through Option 1A-3 represent examples of successful cell switching (e.g., L1/L2 intercell mobility), and Option 1B-1 through Option 1B-2 represent examples of successful cell switching (e.g., L1/L2 intercell mobility). An example of a failure of L2 intercell mobility is shown.

[Option 1A-1]
When the UE transmits HARQ-ACK in response to the serving cell switching instruction, it means that the cell switching is successful, and the UE operation/base station operation may be controlled. HARQ-ACK may mean ACK (ACKnowledgement) (see FIG. 8) or ACK/NACK.

FIG. 8 shows that cell switching is successful when a serving cell switching instruction (for example, L1/L2 cell switch indication signaling) is transmitted from the base station to the UE, and the UE transmits an ACK in response to the switching instruction. Indicates the meaning. In this case, a case is shown in which switching to a new serving cell is controlled after a predetermined period (for example, Y) after successful cell switching (for example, after ACK transmission).

If HARQ-ACK means ACK, even if the UE sends a NACK (before sending the ACK), it does not need to mean that the cell switching was successful. That is, there may be NACK feedback or retransmission of L1/L2 signaling before ACK transmission.

For example, when a serving cell switching instruction is given by a MAC CE, the serving cell switching may be defined as successful if the HARQ-ACK feedback for the PDSCH transmitting the MAC CE is ACK.

When a serving cell switching instruction is given by DCI, the definition of ACK may differ depending on whether the DCI includes DL assignment/UL assignment (for example, DL assignment/UL assignment).

When a DCI that includes DL assignment (for example, DL assignment) is used to instruct serving cell switching, serving cell switching is defined as successful if the HARQ-ACK feedback for the PDSCH scheduled by the DCI is ACK. You can.

When a DCI that does not include DL assignment/UL assignment (for example, DL assignment/UL assignment) is used to instruct serving cell switching, HARQ-ACK feedback for the DCI (or PDCCH that transmits the DCI) is not an ACK. It may be defined that the serving cell switching is successful in a certain case. In this case, the CRC added to the DCI may be scrambled with a predetermined RNTI (eg, RNTI other than C-RNTI).

When a DCI that includes UL assignment (for example, UL assignment) is used to instruct serving cell switching, the PUSCH scheduled by the DCI may be considered as HARQ-ACK feedback with ACK. In other words, it may be defined that the serving cell switching was successful based on the feedback of the PUSCH. Alternatively, the serving cell switching may be defined as successful if the base station reschedules the PUSCH with the same HPN (the same HPN with NDI toggled).

[Option 1A-2]
The cell switching is successful if the UE receives a DL from the new target cell (or candidate cell to be changed to) within a certain window/timer (e.g. certain window/timer). However, UE operation/base station operation may be controlled (see FIG. 9). DL received by the UE may be read as at least one of DL transmission, DL signal, and DL channel.

A specific window/timer may be started, for example, after the transmission of a HARQ-ACK (eg, ACK) in response to a serving cell switching instruction, or after a predetermined period (eg, Y) has elapsed after the transmission of the HARQ-ACK. Of course, the specific window/timer start time is not limited to this. A specific window/timer (e.g., disclosure time (start slot, start symbol, etc.) and/or length) may be defined in the specification and may be determined by the base station using RRC parameters/MAC CE/DCI. The setting/instruction may be made to the UE from the UE.

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

《Option 1A-2-1》
The DL received by the UE may be a DL reference signal (eg, DL-RS). For example, it may mean that the serving cell switching has been successful when the UE receives (or measures) a DL reference signal transmitted from a new target cell. The DL reference signal may be at least one of an SSB, a CSI-RS, and a source RS in an indicated TCI state transmitted from a new target cell.

《Option 1A-2-2》
The DL received by the UE may be a DL channel (eg, PDCCH/PDSCH) or downlink control information (eg, DCI). For example, it may mean that the serving cell switching has been successful if the UE receives (or decodes/detects/monitors) a DL channel/DCI transmitted from a new target cell. The DL channel (eg, PDCCH/PDSCH) or DCI may be a PDCCH/PDSCH corresponding to a predetermined format/type.

For example, if the UE receives DCI in the common search space (for example, CSS), it may mean that the serving cell switching has been successful.

Alternatively, it may mean that the serving cell switch was successful if the UE received 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). good. Previous L1/L2 cell switch signaling may have NDI toggled (assuming no MAC reset).

《Option 1A-2-3》
The DL received by the UE may be an explicit instruction to confirm (or activate, enable) serving cell switching. The explicit instruction may be, for example, RRC parameters/MAC CE/DCI corresponding to the explicit instruction.

In at least one of Options 1A-2-1 to Option 1A-2-3, RACH transmission (or RACH procedure) to the new target cell is completed before cell switching, and transmission to the new target cell is completed before cell switching. TA may have been acquired.

[Option 1A-3]
If the UE completes a random access procedure (or RACH procedure) for a new target cell (or candidate cell to be changed to) within a certain window/timer, UE operation/base station operation may be controlled.

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

[Option 1B-1]
(after the UE sends a HARQ-ACK (e.g. ACK) for a serving cell switching indication or after the UE applies switching to a new target cell), before the end/expiration of a specific window/timer. If a predetermined DL cannot be received (or within a certain window/timer), it may mean that cell switching has failed (see FIGS. 10 and 11). The specific window/timer and predetermined DL may be the window/timer and DL shown in option 1A-2.

FIG. 10 shows that after the UE transmits a HARQ-ACK (e.g., ACK) in response to a serving cell switching instruction, a predetermined This shows a case where DL could not be received. Figure 11 illustrates the case where the UE fails to receive a given DL before the end/expiration of a particular window/timer (or within a particular window/timer) after applying a switch to a new target cell. It shows.

In this case, the UE declares/notifies/reports that cell switching (e.g. L1/L2 intercell mobility) has failed or that a cell switching (e.g. L1/L2 intercell mobility) failure has occurred. You may.

The specific window/timer period (e.g. start time/length, etc.) may be set from the base station to the UE via RRC parameters, or may be set by the base station in the MAC CE/DCI that instructs cell switching. It may be instructed to the UE. The opening time may be a starting slot or a starting symbol.

[Option 1B-2]
If the UE fails to complete the random access procedure (or RACH procedure) to the new target cell before the end/expiry of the specific window/timer (or within the specific window/timer), the UE It may also mean that the switch has failed. In this case, the UE declares/notifies/reports that cell switching (e.g. L1/L2 intercell mobility) has failed or that a cell switching (e.g. L1/L2 intercell mobility) failure has occurred. You may.

If cell switching fails (eg, Option 1B-1 or Option 1B-2), the UE may apply the UE behavior shown in at least one of Option 1-1 to Option 1-3 below.

《Option 1-1》
The UE may return to the original serving cell (eg, the serving cell from which it switched) and monitor DL transmissions (eg, PDCCH) applying the last TCI state in that cell.

After the UE sends the HARQ-ACK (e.g. ACK) for the serving cell switching indication, the DL cannot be received within a certain window/timer (Option 1B-1) or the RACH procedure is not completed (Option 1B-2) In this case, at least the ACK transmission was successful. In this case, the channel quality of the original serving cell is good, and there is a possibility that communication (for example, DL reception) can be performed appropriately.

《Option 1-2》
The UE may perform RACH transmission (or random access procedure) to a specific cell (eg, certain cell). The specific cell may be at least one of an original serving cell (eg, a serving cell from which to switch) and a new target cell. For example, random access procedures during radio link failure (RLF) may be reused.

《Option 1-3》
The UE may perform RACH transmission (or random access procedure) to any cell (eg, ayn cell). For example, a random access procedure performed by a UE in an idle state (UE in IDLE) may be reused.

UE capabilities may be introduced for different UE behavior after cell switching (e.g. L1/L2 inter-cell mobility) failure.

<Second embodiment>
The second embodiment describes an example of UE operation/base station operation when different mobility procedures (or cell change procedures) are supported.

Rel. In R18 and later, cases are also assumed in which L1/L2 intercell mobility (for example, R18 L1/L2 intercell mobility) and L3 mobility (for example, legacy L3 mobility) are supported. L3 mobility may be, for example, handover, CHO (for example, Conditional Handover), or CPC (Conditional PSCell Change). In such a case, it is necessary to appropriately control the interaction (or presence/absence of collision/operation at the time of collision) of multiple (in this case, two) procedures.

If multiple mobility procedures are supported, at least one of the following options 2-1 to 2-4 may be applied. The mobility procedure may be read as a cell change procedure, cell switching procedure, cell switching procedure, or cell update procedure. In addition, in the following explanation, first mobility (for example, L1/L2 inter-cell mobility) and second mobility (for example, L3 mobility) are taken as an example of multiple mobility procedures, but mobility types/ The type is not limited to this. The L3 mobility procedure may reuse a procedure (eg, handover procedure) of an existing system (eg, Rel. 17 or earlier).

[Option 2-1]
Assume that a first mobility procedure (eg, a cell switching procedure between L1/L2 cells) is in progress. The cell switching procedure between L1/L2 cells may be ongoing when, for example, the UE has received signaling for an L1/L2 cell switching instruction (and before the cell switching is completed).

In this case, the UE may not expect to receive the second mobility indication/perform the second mobility procedure before the L1/L2 cell switching procedure is completed (or successful) (see Figure 12A). . Before the L1/L2 cell switching procedure is completed (or successful) may mean before the cell switching succeeds or fails as described in the first embodiment.

This creates a configuration in which the second mobility is not performed while the first mobility (for example, cell switching procedure between L1/L2 cells) is in progress, thereby avoiding the case where two mobility procedures occur simultaneously. Can be done.

[Option 2-2]
Assume that a second mobility procedure (eg, L3 mobility procedure) is in progress. In this case, the UE may assume that it does not 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 Figure 12B).

This results in a configuration in which the first mobility (e.g., cell switching procedure between L1/L2 cells) is not performed while the second mobility (e.g., handover procedure) is in progress, thereby making it possible to avoid cases in which two mobility procedures occur simultaneously.

[Option 2-3]
If a first mobility procedure (e.g. a cell switching procedure between L1/L2 cells) is in progress, the receipt/receipt of a second mobility instruction may occur before the L1/L2 cell switching procedure is completed (or successful). Execution of a second mobility procedure may be allowed/supported. That is, collisions between the first mobility procedure and the second mobility procedure may be tolerated/supported.

If an L3 handover command is received (or the UE determines that the CHO/CPC conditions are met) before the L1/L2 cell switching procedure is completed (or successful), the following option 2-3- At least one of options 1 to 2-3-3 may be applied.

《Option 2-3-1》
The mobility procedure to apply may be selected based on the priority corresponding to the mobility procedure. The priority corresponding to each mobility procedure may be defined in the specifications, or may be set from the base station to the UE using upper layer parameters or the like.

For example, the UE may perform a first mobility procedure (eg, a cell switching procedure between L1/L2 cells). That is, the UE may perform the first mobility procedure with priority over the second mobility procedure. In this case, the second mobility procedure may be controlled not to be performed (or to be canceled).

Alternatively, the UE may perform a second mobility procedure (eg, an L3 mobility procedure). That is, the UE may perform the second mobility procedure with priority over the first mobility procedure. In this case, the first mobility procedure may be controlled not to be performed (or to be canceled).

《Option 2-3-2》
The mobility procedure to apply may be selected based on the instruction (or initiation) timing/order of the mobility procedure.

For example, a mobility procedure that is instructed (or started) later may be performed with priority. If the reception of the second mobility instruction/execution of the second mobility procedure occurs while the first mobility procedure is in progress, the UE cancels or stops the first mobility procedure in progress and It may be controlled to perform the instructed second mobility procedure (see FIG. 13A).

Alternatively, the mobility procedure that is instructed (or started) first may be performed with priority. If the reception of the second mobility instruction/execution of the second mobility procedure occurs while the first mobility is in progress, the UE shall continue with the first mobility procedure in progress and The second mobility procedure may be controlled not to be executed.

《Option 2-3-3》
The UE may autonomously select the mobility procedure to perform.

[Option 2-4]
If a second mobility procedure (e.g. L3 mobility procedure) is in progress, the first mobility instruction (e.g. L1/L2 cell Reception/execution of the first mobility procedure (switching indication signaling) may be allowed/supported.

If the first mobility procedure (for example, L1/L2 cell switching instruction signaling) is received before the second mobility procedure is completed (or successful), the following options 2-4-1 to 2-4 -3 may be applied.

《Option 2-4-1》
The mobility procedure to apply may be selected based on the priority corresponding to the mobility procedure. The priority corresponding to each mobility procedure may be defined in the specifications, or may be set from the base station to the UE using upper layer parameters or the like.

《Option 2-4-2》
The mobility procedure to apply may be selected based on the instruction (or initiation) timing/order of the mobility procedure.

For example, a mobility procedure that is instructed (or started) later may be performed with priority. If a first mobility instruction is received while a second mobility is in progress, the UE cancels or stops the second mobility procedure in progress and performs a later instructed first mobility procedure. It may be controlled to do so (see FIG. 13B).

Alternatively, the mobility procedure that is instructed (or started) first may be performed with priority. If a first mobility indication is received while a second mobility is in progress, the UE continues to perform the second mobility procedure in progress and does not perform a later indicated first mobility procedure. It may be controlled as follows.

《Option 2-4-3》
The UE may autonomously select the mobility procedure to perform.

Option 2-1 to Option 2-4 show cases where L3 mobility includes a handover procedure (for example, L3 handover command procedure) and a CHO/CPC procedure (for example, L3 CHO/CPC procedure). However, it is not limited to this. The handover procedure (for example, L3 handover command procedure) and the CHO/CPC procedure (for example, L3 CHO/CPC procedure) may be applied as separate procedures.

Regarding the interaction of the first mobility and the second mobility, different UE capabilities may be introduced/supported for each of the above options.

<Third embodiment>
In the third embodiment, an example of indicating/activating a TCI state related to an additional PCI will be described. In this disclosure, an additional PCI may be read as an additional cell, a candidate cell, or a target cell.

Rel. In Rel-17 inter-cell beam management, a MAC CE can activate up to 8 TCI states, and some TCI states can be combined with additional PCIs (e.g., additional PCIs). Supported to be associated. However, it is limited to the same frequency as the serving cell (see FIG. 14).

FIG. 14 shows Rel. In inter-cell beam management (ICBM) supported in 17, a maximum of seven additional PCIs (or candidate cells, target cells, additional cells) are configured on the same frequency as the serving cell. The MAC CE may direct activation of TCI state on the same frequency. Frequency may be read as frequency domain or frequency band.

Rel. In L1/L2 inter-cell mobility after 18, it is also assumed that considering inter-frequency scenarios, it will be supported for the MAC CE to activate the TCI state associated with the additional PCI on a different frequency than the serving cell. . At least one of the following options 3-1 to 3-3 may be applied as the indication/activation of the TCI state in L1/L2 inter-cell mobility.

[Option 3-1]
In L1/L2 inter-cell mobility, for the serving cell, the TCI state activated by the MAC CE may be associated with an additional PCI on the same frequency as the serving cell. The MAC CE may be a MAC CE for dynamic beam pointing.

FIG. 15 shows an example where the TCI state activated by the MAC CE is associated with an additional PCI corresponding to the same frequency as the serving cell.

Here, SpCell #0 is set to the first frequency (for example, f0), and the TCI states activated by the MAC CE for the SpCell #0 are SpCell #0, Cell #0-1, Cell #0. -2, cells #0-3, and cells #0-4 are shown.

Further, SCell #1 is set to the second frequency (for example, f1), and the TCI state activated by the MAC CE for the SCell #1 is the SCell #1, Cell #1-1, Cell #1- 2, the case where it is associated with cells #1-3 is shown.

Cells with different frequencies have different cell configurations and frequencies, which may complicate UE operation if dynamic beam pointing between these cells is supported. In this case, for each serving cell, the MAC CE may activate the TCI state for the same frequency.

Additionally, L1/L2 cell switching may be performed within a frequency or between frequencies. Whether intra-frequency cell switching or inter-frequency cell switching is applied may be configured from the base station to the UE through upper layer signaling. Alternatively, instead of (or in addition to) higher layer signaling, it may be determined whether intra-frequency cell switching or inter-frequency cell switching is applied based on UE capability information.

FIG. 16 shows an example of cell switching between frequencies. Here, when cell switching is instructed by L1/L2 cell switching signaling, a new target cell with a different frequency from the current serving cell may be instructed to the serving cell. In this case, the TCI state corresponding to the target cell may be activated by a MAC CE of a different frequency.

For example, the UE may be instructed to switch cells from SpCell #0 to candidate cells #1-1 to #1-3 that correspond to a frequency different from that of the SpCell. In this case, the UE may assume that the TCI state corresponding to the cell after switching (for example, candidate cell #1-1) is the TCI state activated in the MAC CE corresponding to SCell #1. .

[Option 3-2]
In L1/L2 inter-cell mobility, the TCI state activated by the MAC CE for the serving cell may be associated with at least one of an additional PCI on the same frequency as the serving cell and an additional PCI on a different frequency. The MAC CE may be a MAC CE for dynamic beam pointing.

FIG. 17 shows an example where the MAC CE supports activating 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. It shows.

In FIG. 17, candidate cells #0-1, #0-2, and #0-3 are set at the same frequency (f0) as SpCell #0, and candidate cells #1-1 and #1-2 are set at a different frequency f1. This shows a case where candidate cells #2-1 and #2-2 are set at different frequencies f2. Also, SpCell #0, candidate cells #0-1, #0-2, #0-3 correspond to PCI #0, candidate cells #1-1, #1-2 correspond to PCI #1, and candidate cells A case is shown in which cells #2-1 and #2-2 correspond to PCI #2.

Here, for SpCell #0, the TCI states activated by MAC CE are SpCell #0, candidate cells #0-1, #0-2, #0-3, #1-1, #1-2, The case where it is associated with #2-1 and #2-2 is shown. More specifically, the TCI state of SpCell #0 (here, TCI #0) and the TCI state of candidate cell #0-1 (here, TCI #1), TCI state of candidate cell #0-2 (here, TCI #2), TCI state of candidate cell #0-3 (here, TCI #3), TCI state of candidate cell #1-1 (Here, TCI #4), TCI state of candidate cell #1-2 (Here, TCI #5), TCI state of candidate cell #2-1 (Here, TCI #6), Candidate cell #2- A case is shown in which TCI state No. 2 (here, TCI #7) is activated.

If multiple serving cells are configured (e.g. carrier aggregation), the multiple serving cells may have activated TCI states by one or more MAC CEs (e.g. one or more MAC CEs corresponding to different frequencies/cells). It may be shared (see FIG. 18).

In FIG. 18, SpCell #0, candidate cells #0-1, #0-2, #0-3 are set in the first frequency domain (f0), and SCell #1, candidate cells #0-1, #0-3 are set in the second frequency domain (f1). The case is shown in which candidate cells #1-1 and #1-2 are set, and SCell #2 and candidate cells #2-1 and #2-2 are set in the third frequency region (f2). Also, SpCell #0, candidate cells #0-1, #0-2, #0-3 correspond to PCI #0, and SCell #1, candidate cells #1-1, #1-2 correspond to PCI #1. Correspondingly, the case where SCell #2, candidate cells #2-1 and #2-2 correspond to PCI #2 is shown.

Here, the TCI states activated by MAC CE for SpCell #0, SCell #1, and SCell #2 are SpCell #0, candidate cells #0-1, #0-2, #0-3, #1. -1, #1-2, #2-1, and #2-2 are shown.

A certain MAC CE may activate the TCI state of each cell with a different frequency. Alternatively, serving cells/candidate cells that share a MAC CE may be grouped. The group of cells whose TCI state is activated by a common MAC CE may be configured by upper layer signaling or may be defined by the specification.

[Option 3-3]
The TCI state activated by the MAC CE for dynamic beam pointing (or cell switching) is associated with an additional PCI of the same frequency, and the actual frequency (or PCI) to apply is the frequency of the source serving cell or target cell. (or cell index, reference signal resource index (for example, resource RS index)).

FIG. 19 shows an example where the TCI state activated by the MAC CE is associated with an additional PCI corresponding to the same frequency as the serving cell.

Here, SpCell #0, candidate cells #0-1, #0-2, #0-3, #0-4 are set to the first frequency (for example, f0), and the SpCell #0 (or f0 ), the case is shown in which 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.

When applying the activated TCI state to the frequency corresponding to SCell #1, the same TCI state ID (or the same cell ID/resource RS index for each frequency) may be applied to the frequency of SCell #1.

In this case, an association between cell indexes of different frequencies may be set/defined. The association may be implicit (for example, Implicit association) or explicit (for example, Explicit association).

As an implicit association, for example, cell index #x of f0 (e.g., cell(re-)index #x) is associated with cell index #x of f1 (e.g., cell(re-)index #x). Good too. As an example, candidate cell #0-2 of f0 may be associated with candidate cell #1-2 of f1.

As an explicit association, multiple cells that apply the same TCI state at different frequencies (for example, cells with different frequencies) may be associated by upper layer signaling.

UE capabilities regarding support for association between cells of different frequencies may be introduced. Also, for additional PCI cell scenarios, UE capabilities regarding whether to support the application of the TCI states described above may be introduced.

《Setting example #1》
TCI state candidates (also referred to as a TCI state pool) that can be set in a serving cell/candidate cell may be cell (or CC) specific. If the TCI state pool is CC-specific, the TCI state ID for each CC/frequency may start at a predetermined value (eg, 0). Also, the resource RS (eg, QCL type A/D RS) may have a BWP/CC ID for each frequency.

For example, 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 (e.g., SSB #3). ) (see FIG. 20).

FIG. 20 shows a case where SpCell #0, candidate cells #0-1, and #0-2 are set for f0, and SCell #1, candidate cells #1-1, and #1-2 are set for f1. There is. Additionally, TCI status ID #3 is set for candidate cell #0-2 (SSB #2 is transmitted) by upper layer parameters, and TCI state ID #3 is set for candidate cell #1-1 (SSB #3 is transmitted). This shows a case where TCI status ID #3 is set by upper layer parameters.

In this case, if the MAC CE activates at least TCI state #3, it may mean that for each frequency (each TCI state pool of different CCs/frequencies) TCI state #3 is activated.

Furthermore, when L1/L2 cell switching signaling indicates candidate cell #1-1 as the target cell and TCI state ID #3 as the TCI state, the TCI of frequency f1 corresponding to the candidate cell #1-1 Status ID #3 may be applied.

In the example shown in FIG. 20, it may be supported that the same TCI state ID of each CC has different resource RS and cell ID.

《Setting example #2》
The TCI state candidates (also referred to as TCI state pool) that can be set in the serving cell/candidate cell may be cell (or CC) common/common. If the TCI state pool is CC common, the TCI state ID may be set for the reference BWP/CC.

For example, assume that for f0, TCI state ID #3 includes resources (for example, SSB #2) from candidate cell #0-2 (see FIG. 21).

In FIG. 21, SpCell#0, candidate cells#0-1, and #0-2 are set to f0, and SCell#1, candidate cells#1-1, and #1-2 are set to f1. Also, a case is shown in which TCI state ID#3 is set for candidate cell#0-2 (to which SSB#2 is transmitted) by higher layer parameters.

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

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

[[Option B-2]]
The association between candidate cell #0-2 and candidate cell #1-2 may be set implicitly/explicitly. In this case, only candidate cells #1-2 are available in f1 for TCI state ID #3. If L1/L2 cell switching signaling indicates candidate cell #1-2 as the target cell and TCI state ID #3 as the TCI state, the QCL resource RS ID is the SSB# from candidate cell #1-2. It becomes 2.

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

<Fourth embodiment>
In the fourth embodiment, an example of synchronous (Sync) and asynchronous (Async) settings in consideration of intra-cell multi-TRP/inter-cell multi-TRP in L1/L2 intra-cell mobility (for example, cell switching) will be described.

Rel. It is assumed that TA settings for each TRP will be supported for multi-DCI-based multi-TRPs (for example, mDCI MTRP) in 18 and later. Multi-TRP may be supported both intra-cell and inter-cell. For example, for multi-DCI-based multi-TRP operations where multiple (eg, two) TAs are supported, the configuration of two timing advance groups (TAGs) belonging to the serving cell is supported.

In L1/L2 inter-cell mobility (for example, L1/L2 inter-cell mobility), different TAGs may be configured for serving cells/candidate cells.

In L1/L2 inter-cell mobility, intra-cell multi-TRP (for example, the case where two TRPs share the same PCI) and inter-cell multi-TRP (for example, the case where two TRPs have different PCIs (Rel.17/18) may be supported.

FIG. 22 shows an example of intra-cell multi-TRP and inter-cell multi-TRP. Here, multi-TRP (here, two TRPs) is set for SpCell #0 and SCell #2, and multi-TRP (here, two TRPs) is set for the candidate cell corresponding to the same frequency region as SCell #1. Indicates the case where Information regarding the serving cell/candidate cell where multi-TRP is configured may be configured/instructed from the base station to the UE using upper layer parameters/MAC CE/DCI, etc.

In the case of intra-cell multi-TRP, the two TRPs corresponding to each cell may each correspond to two TCI states associated with one PCI. In the case of inter-cell multi-TRP, two TRPs corresponding to different cells may each correspond to two TCI states respectively associated with two PCIs.

For L1/L2 intercell mobility, at least one of the following options 4-1 to 4-10 is applied as support/configuration of intra-cell multi-TRP and inter-cell multi-TRP, and synchronous/asynchronous settings. You can.

[Option 4-1]
The serving cell (eg, SpCell/SCell) may support configuration of intra-cell multi-TRP (eg, intra-cell MTRP). Furthermore, synchronous/asynchronous (eg, sync/async) settings may be supported for intra-cell multi-TRP.

When synchronization is set for multi-TRPs within a cell, it may mean that multiple (eg, two) TRPs within the cell are synchronized (eg, belonging to the same TAG). When asynchronous is set for intra-cell multi-TRP, it may mean that multiple (for example, two) TRPs within the cell are asynchronous (for example, belong to different TAGs).

The intra-cell multi-TRP setting may be set from the base station to the UE using upper layer parameters, etc. Information regarding synchronization/asynchronization (for example, belonging to the same TAG/belonging to different TAGs) between multiple TRPs within a cell may be indicated by a random access response or by RRC/MAC CE/DCI. good.

[Option 4-2]
The serving cell (eg, SpCell/SCell) may support configuration of inter-cell multi-TRP (eg, inter-cell MTRP). Furthermore, synchronous/asynchronous (eg, sync/async) settings may be supported for inter-cell multi-TRP.

When synchronization is set for inter-cell multi-TRPs, it may mean that multiple (for example, two) TRPs between cells are synchronized (for example, belonging to the same TAG). When asynchronous is set for inter-cell multi-TRP, it may mean that multiple (for example, two) TRPs between cells are asynchronous (for example, they belong to different TAGs).

The inter-cell multi-TRP setting may be set from the base station to the UE using upper layer parameters, etc. Information regarding synchronization/asynchronization between multiple TRPs between cells (for example, belonging to the same TAG/belonging to different TAGs) may be indicated by a random access response or by RRC/MAC CE/DCI. good.

Both option 4-1 and option 4-2 may be supported. For example, in case of intra-cell multi-TRP, two TRPs belong to the same TAG, and in case of inter-cell multi-TRP, the case where two TRPs belong to different TAGs may be supported.

[Option 4-3]
The serving cell (eg, SpCell/SCell) may not support the configuration of intra-cell multi-TRP (eg, intra-cell MTRP). Furthermore, synchronous/asynchronous (eg, sync/async) settings may not be supported for intra-cell multi-TRP.

[Option 4-4]
The serving cell (e.g., SpCell/SCell) may not support the configuration of inter-cell multi-TRP (e.g., inter-cell MTRP). Also, the synchronous/asynchronous (e.g., sync/async) configuration may not be supported for the inter-cell multi-TRP.

[Option 4-5]
Options 4-1 to 4-4 may be applied in combination as appropriate. For example, a configuration (option 4-1 + option 4-2) may be used in which both (sync/async) intra-cell multi-TRP settings and (sync/async) inter-cell multi-TRP settings are supported. Alternatively, a configuration may be used (option 4-1 + option 4-4) in which (sync/async) intra-cell multi-TRP settings are supported, but (sync/async) inter-cell multi-TRP settings are not supported. Alternatively, a configuration may be used (option 4-2 + option 4-3) in which the (sync/async) intra-cell multi-TRP setting is not supported, but the (sync/async) inter-cell multi-TRP setting is supported.

[Option 4-6]
The candidate cell may support configuration of intra-cell multi-TRP (eg, intra-cell MTRP). Furthermore, synchronous/asynchronous (eg, sync/async) settings may be supported for intra-cell multi-TRP.

When synchronization is set for intra-cell multi-TRPs, it may mean that multiple (for example, two) TRPs within the candidate cell are synchronized (for example, belonging to the same TAG). When asynchronous is set for intra-cell multi-TRP, it may mean that multiple (for example, two) TRPs within the candidate cell are asynchronous (for example, belong to different TAGs).

The intra-cell multi-TRP setting may be set from the base station to the UE using upper layer parameters, etc. Information regarding synchronization/asynchronization (for example, belonging to the same TAG/belonging to different TAGs) between multiple TRPs in a candidate cell may be indicated by a random access response or may be indicated by RRC/MAC CE/DCI. Good too.

[Option 4-7]
The candidate cell may support configuration of inter-cell multi-TRP (eg, inter-cell MTRP). Furthermore, synchronous/asynchronous (eg, sync/async) settings may be supported for inter-cell multi-TRP.

When synchronization is set for inter-cell multi-TRPs, it may mean that multiple (for example, two) TRPs between candidate cells are synchronized (for example, belonging to the same TAG). When asynchronous is set for inter-cell multi-TRP, it may mean that multiple (for example, two) TRPs between candidate cells are asynchronous (for example, belong to different TAGs).

The inter-cell multi-TRP setting may be set from the base station to the UE using upper layer parameters, etc. Information regarding synchronization/asynchronization (for example, belonging to the same TAG/belonging to different TAGs) between multiple TRPs between candidate cells may be indicated by a random access response, or may be indicated by RRC/MAC CE/DCI. Good too.

Both option 4-6 and option 4-7 may be supported. For example, in the case of intra-cell multi-TRP, two TRPs in a candidate cell belong to the same TAG, and in the case of inter-cell multi-TRP, the case where two TRPs between candidate cells belong to different TAGs may be supported.

[Option 4-8]
The candidate cell may not support configuration of intra-cell multi-TRP (eg, intra-cell MTRP). Furthermore, synchronous/asynchronous (eg, sync/async) settings may not be supported for intra-cell multi-TRP.

[Option 4-9]
The candidate cell may not support configuration of inter-cell multi-TRP (eg, inter-cell MTRP). Further, synchronous/asynchronous (eg, sync/async) settings may not be supported for inter-cell multi-TRP.

[Option 4-10]
Options 4-6 to 4-9 may be applied in combination as appropriate. For example, regarding candidate cell/cell group switching, a configuration in which both (sync/async) intra-cell multi-TRP settings and (sync/async) inter-cell multi-TRP settings are supported (Option 4-6 + Option 4 -7) may be used. Alternatively, regarding candidate cell/cell group switching, (sync/async) intra-cell multi-TRP settings are supported, but (sync/async) inter-cell multi-TRP settings are not supported (Option 4-6 + Option 4-9) You can also use it as Alternatively, for candidate cell/cell group switching, (sync/async) intra-cell multi-TRP settings are not supported, and (sync/async) inter-cell multi-TRP settings are supported (Option 4-7 + Option 4- 8) may be used.

[variation]
In options 4-6 to 4-10, the candidate cell may be distinguished as to whether it is a candidate cell for SpCell switching or a candidate cell for SCell switching. In this case, the presence or absence of setting of intra-cell multi-TRP/inter-cell multi-TRP (or synchronous/asynchronous) is set separately for the candidate cell corresponding to SpCell and the candidate cell corresponding to SCell (or each SCell). Good too.

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

In options 4-1 to 4-10, only one of synchronous and asynchronous (for example, synchronous) may be supported. For example, a UE capability for synchronization may be supported as a basic UE capability, and a UE capability for asynchronization may be supported separately from (or in addition to) a UE capability for synchronization.

<Supplement>
At least one of the embodiments described above may apply only to UEs that have reported or support a particular UE capability.

The particular UE capability may indicate at least one of the following:
- supporting specific UE behavior in case of cell switching failure;
- supporting collisions between L1/L2 intercell mobility procedures/operations and L3 mobility procedures/operations;
- supporting intra-frequency cell switching when the TCI state activated by the MAC CE is associated with serving cells/candidate cells corresponding to the same frequency region;
- supporting inter-frequency cell switching when the TCI state activated by the MAC CE is associated with serving cells/candidate cells corresponding to the same frequency region;
- the TCI states activated by the MAC CE are associated with serving cells/candidate cells corresponding to different frequency regions, in such cases the maximum number of frequency regions, the maximum number of candidate cells, the maximum number of cells per frequency;
・Intra-cell multi-TRP/inter-cell multi-TRP configuration is supported for the serving cell;
- Intra-cell multi-TRP/inter-cell multi-TRP settings are supported for candidate cells.

Further, the specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency) or a capability that is applied across all frequencies (e.g., cell, band, band combination, BWP, component carrier, etc.). or a combination of these), or by frequency range (for example, Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2). Alternatively, it may be a capability for each subcarrier spacing (SCS), or a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all duplex schemes (commonly regardless of the duplex scheme), or may be a capability that is applied across all duplex schemes (for example, Time Division Duplex). The capability may be for each frequency division duplex (TDD)) or frequency division duplex (FDD)).

Also, at least one of the embodiments described above may be applied when the UE is configured with specific information related to the embodiment described above by upper layer signaling.

If the UE does not support at least one of the specific UE capabilities or is not configured with the specific information, for example, Rel. 15/16/17 operations may be applied.

(Additional note)
Regarding one embodiment of the present disclosure, the following invention will be added.
[Appendix 1-1]
a receiving unit that receives at least one of downlink control information and a MAC Control Element (MAC CE) including cell switching instruction information from a serving cell to a candidate cell; transmitting an ACK (ACKnowledgement) for the cell switching instruction information; control for determining success or failure of switching from the serving cell to the candidate cell based on at least one of: receiving a DL transmission from the candidate cell in a specific window or timer period after receiving switching instruction information; A terminal having a section and a terminal.
[Appendix 1-2]
The terminal according to appendix 1-1, wherein the specific window or timer is started after the ACK transmission or after a predetermined period after the ACK transmission.
[Appendix 1-3]
Additional note that the control unit determines that the switching from the serving cell to the candidate cell has failed if the DL transmission from the candidate cell cannot be received/the random access procedure is not completed in the specific window or timer period. 1-1 or the terminal described in Appendix 1-2.
[Appendix 1-4]
Supplementary Notes 1-1 to 1-3, wherein the control unit controls to perform a random access procedure for at least one of the serving cell and the candidate cell when switching from the serving cell to the candidate cell fails. A device listed in any of the above.

[Appendix 2-1]
a receiving unit that receives at least one of first instruction information instructing an L1/L2 inter-cell mobility procedure and second instruction information instructing an L3 mobility procedure; a control unit that controls the L1/L2 inter-cell mobility procedure and controls the L3 mobility procedure based on the second instruction information, the control unit controlling the L1/L2 inter-cell mobility procedure and A terminal that controls not to perform the L3 mobility procedures at the same time.
[Appendix 2-2]
The control unit assumes that the second instruction information is not received when the L1/L2 inter-cell mobility procedure is in progress, and receives the first instruction information when the L3 mobility procedure is in progress. Terminals listed in Appendix 2-1 that are assumed not to be used.
[Appendix 2-3]
The terminal according to attachment 2-1 or attachment 2-2, wherein the control unit gives priority to a specific procedure when the L1/L2 inter-cell mobility procedure and the L3 mobility procedure conflict.
[Appendix 2-4]
The terminal according to any one of attachments 2-1 to 2-3, wherein the control unit gives priority to a procedure instructed later when the L1/L2 inter-cell mobility procedure and the L3 mobility procedure conflict.

[Appendix 3-1]
a receiving unit that receives a MAC Control Element (MAC CE) including information regarding an active transmission configuration indicator (TCI) state respectively associated with a serving cell and one or more candidate cells corresponding to the serving cell; a control unit that determines a TCI state corresponding to the serving cell and a TCI state corresponding to the candidate cell based on the MAC CE, and the TCI state activated by the MAC CE is at least in the same frequency region as the serving cell. A terminal associated with the corresponding candidate cell.
[Appendix 3-2]
The terminal according to appendix 3-1, wherein the TCI state activated by the MAC CE is associated with a candidate cell corresponding to the same frequency region as the serving cell and a candidate cell corresponding to a different frequency region from the serving cell.
[Appendix 3-3]
When a plurality of serving cells are configured, at least one of an active TCI state associated with the plurality of serving cells by one MAC CE and an active TCI state associated with one or more candidate cells respectively corresponding to the plurality of serving cells is indicated. The terminal described in Appendix 3-1 or 3-2.
[Appendix 3-4]
The control unit determines a TCI state corresponding to at least one of a serving cell and a candidate cell corresponding to another frequency region based on a TCI state ID instructed to a serving cell corresponding to a certain frequency region by the MAC CE. The terminal described in any of Supplementary Notes 3-1 to 3-3 to be determined.

[Appendix 4-1]
a receiving unit that receives at least one of downlink control information and a MAC Control Element (MAC CE) including cell switching instruction information from a serving cell to a candidate cell; and a receiving unit that controls cell switching operations based on the cell switching instruction information. A terminal comprising: a control unit; and at least one of the serving cell and the candidate cell is configured with at least one of an intra-cell multi-transmission/reception point and an inter-cell multi-transmission/reception point.
[Appendix 4-2]
The terminal according to appendix 4-1, wherein when the intra-cell multi-transmission/reception points are set, a plurality of transmission/reception points included in at least one of the serving cell and the candidate cell are set synchronously or asynchronously.
[Appendix 4-3]
When the inter-cell multi-transmission/reception points are set, at least one of the plurality of transmission/reception points included in each of the plurality of serving cells and the plurality of transmission/reception points included in each of the plurality of candidate cells is set to be synchronous or asynchronous. 1 or the terminal described in Appendix 4-2.
[Appendix 4-4]
If the configuration of both the intra-cell multi-transmission/reception point and the inter-cell multi-transmission/reception point is supported, multiple transmission/reception points included in a certain cell are set to the same timing advance group, and multiple transmission/reception points included in different cells are set to the same timing advance group. The terminal according to any one of Supplementary notes 4-1 to 4-3, in which points are supported to be set in different timing advance groups.

(wireless communication system)
The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

FIG. 23 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (also simply referred to as system 1) uses Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). It may also be a system that realizes communication using

Additionally, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC has dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), and dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)).

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

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

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

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).

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

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

The plurality of base stations 10 may be connected by wire (for example, optical fiber, X2 interface, etc. compliant with Common Public Radio Interface (CPRI)) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is an upper station, is an Integrated Access Backhaul (IAB) donor, and base station 12, which is a relay station, is an IAB donor. May also be called a node.

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

Core Network 30 is, for example, User Plane Function (UPF), Access and Mobility Management Function (AMF), Session Management (SMF), Unified Data Management. T (UDM), ApplicationFunction (AF), Data Network (DN), Location Management Network Functions (NF) such as Function (LMF) and Operation, Administration and Maintenance (Management) (OAM) may also be included. Note that multiple functions may be provided by one network node. Furthermore, communication with an external network (eg, the Internet) may be performed via the DN.

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

In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access method may be used. For example, in at least one of the downlink (DL) and 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.

A wireless access method may also be called a waveform. Note that in the wireless communication system 1, other wireless access methods (for example, other single carrier transmission methods, other multicarrier transmission methods) may be used as the UL and DL radio access methods.

In the wireless communication system 1, the downlink channels include a physical downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (physical broadcast channel (PBCH)), and a downlink control channel (physical downlink control). Channel (PDCCH)) or the like may be used.

In the wireless communication system 1, uplink channels include a physical uplink shared channel (PUSCH) shared by each user terminal 20, an uplink control channel (PUCCH), and a random access channel. (Physical Random Access Channel (PRACH)) or the like may be used.

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

Lower layer control information may be transmitted by PDCCH. The lower layer control information may include, for example, downlink control information (DCI) that includes scheduling information for at least one of PDSCH and PUSCH.

Note that the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc., and the DCI that schedules PUSCH may be called UL grant, UL DCI, etc. Note that PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

A control resource set (CONtrol REsource SET (CORESET)) and a search space may be used to detect the PDCCH. CORESET corresponds to a resource for searching DCI. The search space corresponds to a search area and a search method for PDCCH candidates (PDCCH candidates). One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

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

The PUCCH allows channel state information (CSI), delivery confirmation information (for example, may be called Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK), ACK/NACK, etc.), and scheduling request ( Uplink Control Information (UCI) including at least one of SR)) may be transmitted. A random access preamble for establishing a connection with a cell may be transmitted by PRACH.

Note that in this disclosure, downlinks, uplinks, etc. may be expressed without adding "link". Furthermore, various channels may be expressed without adding "Physical" at the beginning.

In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), and the like may be transmitted. In the wireless communication system 1, the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DeModulation). Reference Signal (DMRS)), Positioning Reference Signal (PRS), Phase Tracking Reference Signal (PTRS), etc. may be transmitted.

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

In addition, in the wireless communication system 1, measurement reference signals (Sounding Reference Signal (SRS)), demodulation reference signals (DMRS), etc. are transmitted as uplink reference signals (UL-RS). good. Note that DMRS may be called a user terminal-specific reference signal (UE-specific reference signal).

(base station)
FIG. 24 is a diagram illustrating an example of the configuration of a base station according to an embodiment. The base station 10 includes a control section 110, a transmitting/receiving section 120, a transmitting/receiving antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140 may be provided.

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

The control unit 110 controls the entire base station 10. The control unit 110 can be configured from a controller, a control circuit, etc., which will be explained based on common recognition in the technical field related to the present disclosure.

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

The transmitting/receiving section 120 may include a baseband section 121, a radio frequency (RF) section 122, and a measuring section 123. The baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212. The transmitter/receiver unit 120 includes a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter/receiver circuit, etc., which are explained based on common understanding in the technical field related to the present disclosure. be able to.

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

The transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.

The transmitter/receiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitter/receiver 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.

The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

The transmitting/receiving unit 120 (transmission processing unit 1211) performs Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.

The transmitting/receiving unit 120 (transmission processing unit 1211) performs channel encoding (which may include error correction encoding), modulation, mapping, filter processing, and discrete Fourier transform (DFT) on the bit string to be transmitted. A baseband signal may be output by performing transmission processing such as processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion.

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

On the other hand, the transmitting/receiving section 120 (RF section 122) may perform amplification, filter processing, demodulation into a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.

The transmitting/receiving unit 120 (reception processing unit 1212) performs analog-to-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) processing (if necessary), applying reception processing such as filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing, User data etc. may also be acquired.

The transmitting/receiving unit 120 (measuring unit 123) may perform measurements regarding the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal. The measurement unit 123 is the receiving power (for example, Reference Signal Received Power (RSRP)), Receive Quality (eg, Reference Signal Received Quality (RSRQ), Signal To InterfERENCE PLUS NOI. SE RATIO (SINR), Signal to Noise Ratio (SNR) , signal strength (for example, Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), etc. may be measured. The measurement results may be output to the control unit 110.

The transmission path interface 140 transmits and receives signals (backhaul signaling) between devices included in the core network 30 (for example, network nodes providing NF), other base stations 10, etc., and provides information for the user terminal 20. User data (user plane data), control plane data, etc. may be acquired and transmitted.

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

The transmitting/receiving unit 120 may transmit to the terminal at least one of downlink control information including cell switching instruction information from a serving cell to a candidate cell and a MAC CE (MAC Control Element). The control unit 110 may determine whether the switching from the serving cell to the candidate cell is successful or unsuccessful based on an ACK (ACKnowledgement) for cell switching instruction information transmitted from the terminal.

The transmitter/receiver 120 may transmit at least one of first instruction information that instructs the L1/L2 inter-cell mobility procedure and second instruction information that instructs the L3 mobility procedure. The control unit 110 may control the transmission of the first instruction information and the second instruction information so that the L1/L2 inter-cell mobility procedure and the L3 mobility procedure do not conflict.

The transmitter/receiver 120 may transmit a MAC CE (MAC Control Element) that includes information regarding active transmission configuration indicators (TCI) states respectively associated with the serving cell and one or more candidate cells corresponding to the serving cell. The control unit 110 may instruct the TCI state corresponding to the serving cell and the TCI state corresponding to the candidate cell based on the MAC CE. The TCI state activated by the MAC CE may be associated with a candidate cell that corresponds to at least the same frequency region as the serving cell.

The transmitter/receiver 120 may transmit at least one of downlink control information including cell switching instruction information from a serving cell to a candidate cell and a MAC CE (MAC Control Element). The control unit 110 may instruct a cell switching operation using the cell switching instruction information. At least one of the serving cell and the candidate cell may be configured with at least one of an intra-cell multi-transmission/reception point and an inter-cell multi-transmission/reception point.

(user terminal)
FIG. 25 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control section 210, a transmitting/receiving section 220, and a transmitting/receiving antenna 230. Note that one or more of each of the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided.

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

The control unit 210 controls the entire user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which will be explained based on common recognition in the technical field related to the present disclosure.

The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception using the transmitting/receiving unit 220 and the transmitting/receiving antenna 230, measurement, and the like. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as a signal, and may transfer the generated data to the transmitting/receiving unit 220.

The transmitting/receiving section 220 may include a baseband section 221, an RF section 222, and a measuring section 223. The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212. The transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field related to the present disclosure.

The transmitting/receiving section 220 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section. The transmitting section may include a transmitting processing section 2211 and an RF section 222. The reception section may include a reception processing section 2212, an RF section 222, and a measurement section 223.

The transmitting/receiving antenna 230 can be configured from an antenna, such as an array antenna, as described based on common recognition in the technical field related to the present disclosure.

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

The transmitting/receiving unit 220 may form at least one of a transmitting beam and a receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

The transmission/reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (e.g. RLC retransmission control), MAC layer processing (e.g. , HARQ retransmission control), etc., to generate a bit string to be transmitted.

The transmitting/receiving unit 220 (transmission processing unit 2211) performs channel encoding (which may include error correction encoding), modulation, mapping, filter processing, DFT processing (as necessary), and IFFT processing on the bit string to be transmitted. , precoding, digital-to-analog conversion, etc., and output a baseband signal.

Note that whether or not to apply DFT processing may be based on the settings of transform precoding. When transform precoding is enabled for a certain channel (for example, PUSCH), the transmitting/receiving unit 220 (transmission processing unit 2211) performs the above processing in order to transmit the channel using the DFT-s-OFDM waveform. DFT processing may be performed as the transmission processing, or if not, DFT processing may not be performed as the transmission processing.

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

On the other hand, the transmitting/receiving section 220 (RF section 222) may perform amplification, filter processing, demodulation into a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.

The transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, and decoding (error correction) on the acquired baseband signal. (which may include decoding), MAC layer processing, RLC layer processing, and PDCP layer processing may be applied to obtain user data and the like.

The transmitting/receiving unit 220 (measuring unit 223) may perform measurements regarding the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement results may be output to the control unit 210.

Note that the transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.

The transmitting/receiving unit 220 may receive at least one of downlink control information including cell switching instruction information from a serving cell to a candidate cell and a MAC CE (MAC Control Element). The control unit 210 transmits an ACK (ACKnowledgement) in response to the cell switching instruction information, and receives DL transmission from the candidate cell in a specific window or timer period after receiving the cell switching instruction information. , the success or failure of switching from the serving cell to the candidate cell may be determined. A particular window or timer may be started after an ACK is sent or after a predetermined period of time after said ACK is sent. The control unit 210 may determine that the switching from the serving cell to the candidate cell has failed if the DL transmission from the candidate cell cannot be received/the random access procedure is not completed within a specific window or timer period. If the switching from the serving cell to the candidate cell fails, the control unit 210 may perform control to perform a random access procedure on at least one of the serving cell and the candidate cell.

The transmitting/receiving unit 220 may receive at least one of first instruction information instructing an L1/L2 inter-cell mobility procedure and second instruction information instructing an L3 mobility procedure. The control unit 210 may control the L1/L2 inter-cell mobility procedure based on the first instruction information, and may control the L3 mobility procedure based on the second instruction information. The control unit 210 may control (or assume) not to perform the L1/L2 inter-cell mobility procedure and the L3 mobility procedure at the same time. The controller 210 may assume that the second instruction information is not received when the L1/L2 inter-cell mobility procedure is in progress. The controller 210 may assume that the first instruction information is not received when the L3 mobility procedure is in progress. When the L1/L2 inter-cell mobility procedure and the L3 mobility procedure conflict, the control unit 210 may give priority to a specific procedure. When the L1/L2 inter-cell mobility procedure and the L3 mobility procedure conflict, the control unit 210 may give priority to the procedure instructed later.

The transmitting/receiving unit 220 may receive a MAC CE (MAC Control Element) that includes information regarding active transmission configuration indicators (TCI) states respectively associated with the serving cell and one or more candidate cells corresponding to the serving cell. The control unit 210 may determine the TCI state corresponding to the serving cell and the TCI state corresponding to the candidate cell based on the MAC CE. The TCI state activated by the MAC CE may be associated with a candidate cell that corresponds to at least the same frequency region as the serving cell. The TCI state activated by the MAC CE may be associated with a candidate cell corresponding to the same frequency region as the serving cell and a candidate cell corresponding to a different frequency region than the serving cell. When multiple serving cells are configured, at least one of an active TCI state associated with multiple serving cells and an active TCI state associated with one or more candidate cells each corresponding to the multiple serving cells is indicated by one MAC CE. Good too. The control unit 210 determines the TCI state corresponding to at least one of the serving cell and candidate cell corresponding to another frequency region based on the TCI state ID instructed by the MAC CE to the serving cell corresponding to a certain frequency region. You may.

The transmitting/receiving unit 220 may receive at least one of downlink control information including cell switching instruction information from a serving cell to a candidate cell and a MAC CE (MAC Control Element). The control unit 210 may control the cell switching operation based on the cell switching instruction information. At least one of the serving cell and the candidate cell may be configured with at least one of an intra-cell multi-transmission/reception point and an inter-cell multi-transmission/reception point. When intra-cell multi-transmission/reception points are set, multiple transmission/reception points included in at least one of the serving cell and the candidate cell may be set synchronously or asynchronously. When inter-cell multi-transmission/reception points are set, at least one of the plurality of transmission/reception points included in each of the plurality of serving cells and the plurality of transmission/reception points included in each of the plurality of candidate cells may be set to be synchronous or asynchronous. If both intra-cell multi-transmission/reception points and inter-cell multi-transmission/reception points are supported, multiple transmission/reception points in one cell are set to the same timing advance group, and multiple transmission/reception points in different cells are set to the same timing advance group. It may be supported to be set to different timing advance groups.

(Hardware configuration)
It should be noted that the block diagram used to explain the above embodiment shows blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices. The functional block may be realized by combining software with the one device or the plurality of devices.

Here, functions include judgment, decision, judgement, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and consideration. , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (configuration unit) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.

For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 26 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc. .

Note that in this disclosure, words such as apparatus, circuit, device, section, unit, etc. can be read interchangeably. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured not to include some of the devices.

For example, although only one processor 1001 is illustrated, there may be multiple processors. Also, the processing may be performed by one processor, or the processing may be performed by two or more processors simultaneously, sequentially, or using other techniques. Note that the processor 1001 may be implemented using one or more chips.

Each function in the base station 10 and the user terminal 20 is performed by, for example, loading predetermined software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations and communicates via the communication device 1004. This is achieved by controlling at least one of reading and writing data in the memory 1002 and storage 1003.

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) that includes interfaces with peripheral devices, a control device, an arithmetic unit, registers, and the like. For example, at least a portion of the above-mentioned control unit 110 (210), transmitting/receiving unit 120 (220), etc. may be realized by the processor 1001.

Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated in the processor 1001, and other functional blocks may also be realized in the same way.

The memory 1002 is a computer-readable recording medium, and includes at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. It may be composed of one. Memory 1002 may be called a register, cache, main memory, or the like. The memory 1002 can store executable programs (program codes), software modules, and the like to implement a wireless communication method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM), etc.), a digital versatile disk, removable disk, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium. It may be configured by Storage 1003 may also be called an auxiliary storage device.

The communication device 1004 is hardware (transmission/reception 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, network controller, network card, communication module, etc., for example. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be configured to include. For example, the above-described transmitting/receiving unit 120 (220), transmitting/receiving antenna 130 (230), etc. may be realized by the communication device 1004. The transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).

The input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

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

The base station 10 and user terminal 20 also include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured to include hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these hardwares.

(Modified example)
Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol and signal may be interchanged. Also, the signal may be a message. The reference signal may also be abbreviated as RS, and may be called a pilot, pilot signal, etc. depending on the applicable standard. Further, a component carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, or the like.

A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

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

A slot may 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. Furthermore, a slot may be a time unit based on numerology.

A slot may include multiple mini-slots. Each minislot may be made up of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot. PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.

Radio frames, subframes, slots, minislots, and symbols all represent time units when transmitting signals. Other names may be used for the radio frame, subframe, slot, minislot, and symbol. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.

For example, one subframe may be called a TTI, a plurality of consecutive subframes may be called a TTI, and one slot or one minislot may be called a TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

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

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

Note that when one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (minislot number) that constitutes the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI that is shorter than the normal TTI may be referred to as an abbreviated TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

Note that long TTI (for example, normal TTI, subframe, etc.) may be read as TTI with a time length exceeding 1 ms, and short TTI (for example, short TTI, etc.) It may also be read as a TTI having the above TTI length.

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

Additionally, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

Note that one or more RBs include a physical resource block (Physical RB (PRB)), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, and an RB. They may also be called pairs.

Additionally, a resource block may be configured by one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (also called partial bandwidth, etc.) refers to a subset of consecutive common resource blocks (RB) for a certain numerology in a certain carrier. Good too. Here, the common RB may be specified by an RB index based on a common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

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

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

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

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

The names used for parameters and the like in this disclosure are not limiting in any respect. Furthermore, the mathematical formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable designation, the various names assigned to these various channels and information elements are not in any way exclusive designations. .

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may also be represented by a combination of

Additionally, information, signals, etc. may be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layer. Information, signals, etc. may be input and output via multiple network nodes.

Input/output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Information, signals, etc. that are input and output can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

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

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

Further, notification of prescribed information (for example, notification of "X") is not limited to explicit notification, but may be made implicitly (for example, by not notifying the prescribed information or by providing other information) (by notification).

The determination may be made by a value expressed by 1 bit (0 or 1), or by a boolean value expressed by true or false. , may be performed by numerical comparison (for example, comparison with a predetermined value).

Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.

Additionally, software, instructions, information, etc. may be sent and received via a transmission medium. For example, if the software uses wired technology (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (such as infrared, microwave, etc.) to , a server, or other remote source, these wired and/or wireless technologies are included within the definition of a transmission medium.

The terms "system" and "network" used in this disclosure may be used interchangeably. "Network" may refer to devices (eg, base stations) included in the network.

In this disclosure, "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL)", "Transmission Configuration Indication state (TCI state)", "space "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", Terms such as "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" are interchangeable. can be used.

In the present disclosure, "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," "component carrier," and the like may be used interchangeably. A base station may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (eg, three) cells. If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is connected to a base station subsystem (e.g., an indoor small base station (Remote Radio Communication services can also be provided by the Head (RRH)). The term "cell" or "sector" refers to part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage.

In the present disclosure, a base station transmitting information to a terminal may be interchanged with the base station instructing the terminal to control/operate based on the information.

In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" are used interchangeably. can be done.

A mobile station is a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal. , handset, user agent, mobile client, client, or some other suitable terminology.

At least one of a base station and a mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, or the like.

The moving body refers to a movable object, and the moving speed is arbitrary, and naturally includes cases where the moving body is stopped. The mobile objects include, for example, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, carts, rickshaws, and ships (ships and other watercraft). , including, but not limited to, airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, balloons, and items mounted thereon. Furthermore, the mobile object may be a mobile object that autonomously travels based on a travel command.

The moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (manned or unmanned). ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

FIG. 27 is a diagram illustrating 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 (current sensor 50, (including 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 section 59, and a communication module 60. Be prepared.

The drive unit 41 is composed of, for example, at least one of an engine, a motor, and a hybrid of an engine and a motor. The steering unit 42 includes at least a steering wheel (also referred to as a steering wheel), and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

The electronic control unit 49 includes 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 section 49 may be called an electronic control unit (ECU).

The signals from the various sensors 50 to 58 include a current signal from the current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheel 46/rear wheel 47 obtained by the rotation speed sensor 51, and a signal obtained by the air pressure sensor 52. air pressure signals of the front wheels 46/rear wheels 47, a vehicle speed signal acquired by the vehicle speed sensor 53, an acceleration signal acquired by the acceleration sensor 54, a depression amount signal of the accelerator pedal 43 acquired by the accelerator pedal sensor 55, and a brake pedal sensor. 56, a shift lever 45 operation signal obtained by the shift lever sensor 57, and an object detection sensor 58 for detecting obstacles, vehicles, pedestrians, etc. There are signals etc.

The information service department 59 includes various devices such as car navigation systems, audio systems, speakers, displays, televisions, and radios that provide (output) various information such as driving information, traffic information, and entertainment information, and these devices. It consists of one or more ECUs that control the 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 or the like.

The information service unit 59 may include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accepts input from the outside, and an output device that performs output to the outside (for example, display, speaker, LED lamp, touch panel, etc.).

The driving support system unit 64 includes millimeter wave radar, Light Detection and Ranging (LiDAR), a camera, a positioning locator (for example, Global Navigation Satellite System (GNSS), etc.), and map information (for example, High Definition (HD)). maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., inertial measurement units (IMUs), inertial navigation systems (INS), etc.), artificial intelligence ( Artificial Intelligence (AI) chips, AI processors, and other devices that provide functions to prevent accidents and reduce the driver's driving burden, as well as one or more devices that control these devices. It consists of an ECU. Further, the driving support system section 64 transmits and receives various information via the communication module 60, and realizes a driving support function or an automatic driving function.

The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 communicates via the communication port 63 with 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, which are included in the vehicle 40. Data (information) is transmitted and received between the axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58.

The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with external devices. For example, various information is transmitted and received with an external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10, user terminal 20, etc. described above. Further, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (it may function as at least one of the base station 10 and the user terminal 20).

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

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

The communication module 60 also stores various information received from external devices into a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 controls the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, and left and right rear wheels provided in the vehicle 40. 47, axle 48, various sensors 50-58, etc. may be controlled.

Additionally, the base station in the present disclosure may be replaced by a user terminal. For example, communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the user terminal 20 may have the functions that the base station 10 described above has. Further, words such as "uplink" and "downlink" may be replaced with words corresponding to inter-terminal communication (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may be replaced with sidelink channels.

Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions that the user terminal 20 described above has.

In this disclosure, the operations performed by the base station may be performed by its upper node in some cases. In a network that includes one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (e.g. It is clear that this can be performed by a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc. (though not limited thereto), or a combination thereof.

Each aspect/embodiment described in this disclosure may be used alone, in combination, or may be switched and used in accordance with execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be changed as long as there is no contradiction. For example, the methods described in this disclosure use an example order to present elements of the various steps and are not limited to the particular order presented.

Each aspect/embodiment described in this disclosure includes 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 an integer or decimal number, for example)), 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), and other appropriate wireless communication methods. The present invention may be applied to systems to be used, next-generation systems expanded, modified, created, or defined based on these systems. Furthermore, a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G) may be applied.

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

As used in this disclosure, any reference to elements using the designations "first," "second," etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in any way.

The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "judgment" can mean judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry ( For example, searching in a table, database, or other data structure), ascertaining, etc. may be considered to be "determining."

In addition, "judgment (decision)" includes receiving (e.g., receiving information), transmitting (e.g., sending information), input (input), output (output), access ( may be considered to be "determining", such as accessing data in memory (eg, accessing data in memory).

In addition, "judgment" is considered to mean "judging" resolving, selecting, choosing, establishing, comparing, etc. Good too. In other words, "judgment (decision)" may be considered to be "judgment (decision)" of some action.

Furthermore, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

The "maximum transmit power" described in this disclosure may mean the maximum value of transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the It may also mean rated UE maximum transmit power).

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

In this disclosure, when two elements are connected, they may be connected using one or more electrical wires, cables, printed electrical connections, etc., as well as in the radio frequency domain, microwave can be considered to be "connected" or "coupled" to each other using electromagnetic energy having wavelengths in the light (both visible and invisible) range.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted similarly to "different."

Where "include", "including" and variations thereof are used in this disclosure, these terms are inclusive, as is the term "comprising". It is intended that Furthermore, the term "or" as used in this disclosure is not intended to be exclusive or.

In this disclosure, when articles are added by translation, such as a, an, and the in English, the present disclosure may include that the nouns following these articles are plural.

In the present disclosure, "less than or equal to", "less than", "more than", "more than", "equal to", etc. may be read interchangeably. In addition, in this disclosure, "good", "bad", "large", "small", "high", "low", "early", "slow", "wide", "narrow", etc. The words are not limited to the original, comparative, and superlative, and may be interpreted interchangeably. In addition, in this disclosure, words meaning "good", "bad", "large", "small", "high", "low", "early", "slow", "wide", "narrow", etc. may be interpreted as an expression with "the i-th" (i is any integer), not only in the elementary, comparative, and superlative, but also interchangeably (for example, "the highest" can be interpreted as "the i-th highest"). may be read interchangeably).

In this disclosure, "of", "for", "regarding", "related to", "associated with", etc. are used to refer to each other. It may be read differently.

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

Claims

a receiving unit that receives at least one of first instruction information instructing an L1/L2 inter-cell mobility procedure and second instruction information instructing an L3 mobility procedure;
a control unit that controls the L1/L2 inter-cell mobility procedure based on the first instruction information and controls the L3 mobility procedure based on the second instruction information,
The control unit controls the terminal so that the L1/L2 inter-cell mobility procedure and the L3 mobility procedure are not performed simultaneously.
The control unit assumes that the second instruction information is not received when the L1/L2 inter-cell mobility procedure is in progress, and receives the first instruction information when the L3 mobility procedure is in progress. Terminal according to claim 1, wherein it is assumed that the terminal does not.
The terminal according to claim 1, wherein the control unit gives priority to a specific procedure when the L1/L2 inter-cell mobility procedure and the L3 mobility procedure conflict.
The terminal according to claim 1, wherein when the L1/L2 inter-cell mobility procedure and the L3 mobility procedure conflict, the control unit gives priority to the procedure instructed later.
receiving at least one of first instruction information indicating an L1/L2 intercell mobility procedure and second instruction information indicating an L3 mobility procedure;
controlling the L1/L2 inter-cell mobility procedure based on the first instruction information, and controlling the L3 mobility procedure based on the second instruction information,
The wireless communication method for a terminal, wherein the control unit controls the L1/L2 inter-cell mobility procedure and the L3 mobility procedure not to be performed simultaneously.
a transmitter that transmits at least one of first instruction information that instructs an L1/L2 inter-cell mobility procedure and second instruction information that instructs an L3 mobility procedure;
A base station comprising: a control unit that controls transmission of the first instruction information and the second instruction information so that the L1/L2 inter-cell mobility procedure and the L3 mobility procedure do not conflict.