Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit that, when a first random access channel (RACH) procedure corresponding to a first transmit / receive point (TRP) is set, receives a setting pertaining to a second RACH procedure corresponding to a second TRP; and a control unit that determines, on the basis of a specific condition, whether to maintain the first RACH process or to stop the first RACH process and start the second RACH process. According to one embodiment of the present disclosure, communication can be appropriately performed even when communication is performed using a plurality of transmission points.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further increasing data rates and reducing latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further increasing capacity and improving the level of LTE (Release (Rel.) 8 and 9 of the Third Generation Partnership Project (3GPP (registered trademark))).

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

[0004] Prior art literature

[0005] Non-patent literature

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

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (for example, wireless communication systems after Rel.17 / 5G), it is envisaged to control communications using multiple transmitting and receiving points (for example, Multi-TRP (MTRP)) in a serving cell, or to control communications based on inter-cell mobility including non-serving cells.

[0009] However, when a terminal (user terminal, User Equipment (UE)) performs UL transmission to multiple transmission and reception points, how to control UL transmission (for example, control of timing advance, etc.) becomes a problem. If UL transmission to each transmission and reception point is not properly controlled, there is a concern that the quality of communication using multiple transmission and reception points may deteriorate.

[0010] The present disclosure has been made in view of this aspect, and one of its objectives is to provide a terminal, a wireless communication method, and a base station that can appropriately perform communication even when communication is performed using a plurality of transmission and reception points.

[0011] Means for solving problems

[0012] A terminal involved in one method of the present disclosure comprises: a receiving unit, which receives settings related to a second RACH process corresponding to a second TRP when a first random access channel (RACH) process corresponding to a first transmit receive point (TRP) is set; and a control unit, which determines, based on specific conditions, to maintain the first RACH process, or to stop the first RACH process and start the second RACH process.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, even when communication is performed using a plurality of transmission points, communication can be performed appropriately. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A-Figure 1D This is a diagram showing an example of multi-TRP.

[0016] Figure 2A as well as Figure 2B This is a diagram showing an example of inter-cell mobility.

[0017] Figure 3 This is a diagram showing an example of switching between a serving cell and an additional cell based on L1 / L2 signaling.

[0018] Figure 4 This is a diagram showing an example of setting examples 1 to 3 in the case of supporting candidate cells.

[0019] Figure 5A-Figure 5C This is a diagram showing an example of a situation where switching of candidate cells / candidate cell groups based on L1 / L2 signaling is performed in setting examples 1 to 3 in the case of supporting candidate cells.

[0020] Figure 6 This is a diagram showing an example of a timing advance group (TAG) to which cells included in a cell group belong.

[0021] Figure 7 This is a diagram showing an example of a MAC CE for a timing advance command.

[0022] Figure 8 This is a diagram showing an example of RRC information elements involved in option 1-2.

[0023] Fig. 9 This is a diagram showing another example of RRC information elements involved in Option 1-2.

[0024] Fig.10 This is a diagram showing an example of RRC information elements involved in options 1-3.

[0025] Fig.11 This is a diagram showing an example of the RACH priority operation involved in option 2-2.

[0026] Fig.12 This is a diagram showing an example of a UL time synchronization request according to the third embodiment.

[0027] Fig.13 This is a diagram showing an example of the RACH priority operation involved in option 7-2.

[0028] Fig.14 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0029] Fig.15 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0030] Fig.16 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0031] Fig.17 This is a diagram showing an example of the hardware configuration of a base station and a user terminal involved in one embodiment.

[0032] Fig.18 This is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0033] (TCI, spatial relationship, QCL)

[0034] In NR, research is being conducted on: reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) of a control signal and at least one of a channel (expressed as signal / channel) in the UE based on the Transmission Configuration Indication state (TCI state).

[0035] The TCI state may also represent the TCI state applied to the downlink signal / channel. The TCI state equivalent to the TCI state applied to the uplink signal / channel may also be expressed as a spatial relation.

[0036] The so-called TCI state refers to information related to Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relationship information, etc. The TCI state may also be set for each channel or each signal to the UE.

[0037] QCL refers to an index that indicates the statistical properties of a signal / channel. For example, when a certain signal / channel is in a QCL relationship with other signals / channels, it can also mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same among these different signals / channels (at least one of them is QCL).

[0038] In addition, the spatial reception parameter may also correspond to a reception beam of the UE (eg, a reception analog beam), and the beam may also be determined based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may also be rewritten as sQCL (spatial QCL).

[0039] QCL may also be specified in multiple types (QCL types). For example, four QCL types AD may be set that can assume the same parameters (or parameter sets) but are different. The parameters (also referred to as QCL parameters) are shown below:

[0040] ・QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0041] ・QCL type B (QCL-B): Doppler shift and Doppler spread,

[0042] ・QCL type C (QCL-C): Doppler shift and average delay,

[0043] ・QCL type D (QCL-D): Spatial reception parameters.

[0044] The UE assumes that a certain Control Resource Set (CORESET), channel or reference signal is in a specific QCL (e.g., QCL type D) relationship with other CORESETs, channels or reference signals. This situation may also be referred to as QCL assumption.

[0045] The UE may also determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0046] The TCI state may be, for example, information related to the QCL of the target channel (in other words, the reference signal (RS) used for the channel) and other signals (for example, other RS). The TCI state may also be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0047] In addition, the channel / signal that becomes the application object of the TCI state can also be called the target channel / reference signal (target channel / RS), or simply referred to as the target, etc., and the other signals mentioned above can also be called the reference reference signal (reference RS), source RS (source RS), or simply referred to as reference, etc.

[0048] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of the downlink shared channel (Physical Downlink Shared Channel (PDSCH)), the downlink control channel (Physical Downlink Control Channel (PDCCH)), the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and the uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0049] In addition, the RS that is in a QCL relationship with the channel may be, for example, a synchronization signal block (SynchronizationSignal Block (SSB)), a channel state information reference signal (CSI-RS), a measurement reference signal (Sounding Reference Signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS))), a QCL detection reference signal (also called QRS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), etc., at least one of the following.

[0050] The SSB is a signal block including at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel (physical broadcast channel (PBCH)). The SSB may also be referred to as an SS / PBCH block.

[0051] The RS of QCL type X in the TCI state may also mean an RS that is in a QCL type X relationship with (a DMRS of) a certain channel / signal, and the RS may also be referred to as a QCL source of QCL type X in the TCI state.

[0052] (Multiple TRP)

[0053] In NR, one or more Transmission / Reception Points (TRPs) (multi-TRPs) are being studied for DL ​​transmission to the UE using one or more panels (multi-panels). In addition, the UE is being studied for UL transmission to one or more TRPs.

[0054] In addition, multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID (eg, PCI) or a virtual cell ID.

[0055] Figures 1A-1D This is a diagram showing an example of a multi-TRP scenario. In these examples, it is assumed that each TRP can transmit 4 different beams, but it is not limited to this.

[0056] Figure 1A This is an example of a situation where only one TRP (in this example, TRP1) among multiple TRPs transmits to the UE (may also be referred to as single mode, single TRP, etc.). In this case, TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.

[0057] In the present disclosure, the single TRP mode may also mean a mode in a case where the multi-TRP (mode) is not set.

[0058] Figure 1B This is an example of a situation where only one TRP (TRP1 in this example) among multiple TRPs sends a control signal to the UE and the multiple TRPs send data signals (also called single-master mode). The UE receives each PDSCH sent from the multiple TRPs based on one downlink control information (Downlink Control Information (DCI)).

[0059] Figure 1C This is an example of a situation in which each of the multiple TRPs sends a part of a control signal to the UE, and the multiple TRPs send data signals (also referred to as master-slave mode). Part 1 of the control signal (DCI) may be sent in TRP1, and part 2 of the control signal (DCI) may be sent in TRP2. Part 2 of the control signal may also depend on part 1. Based on these parts of the DCI, the UE receives each PDSCH sent from the multiple TRPs.

[0060] Figure 1DThis is an example of a situation in which each of the multiple TRPs sends a separate control signal to the UE and the multiple TRPs send data signals (also referred to as multi-master mode). The first control signal (DCI) may be sent in TRP1 and the second control signal (DCI) may be sent in TRP2. Based on these DCIs, the UE receives each PDSCH sent from the multiple TRPs.

[0061] exist Figure 1B In the case where one DCI is used to schedule multiple PDSCHs from multiple TRPs (also referred to as multiple PDSCHs), the DCI may also be referred to as a single DCI (S-DCI, single PDCCH). Figure 1D When multiple DCIs are used to schedule multiple PDSCHs from multiple TRPs respectively, these multiple DCIs can also be called multi-DCI (M-DCI, multiple PDCCH).

[0062] It is also possible to send different transport blocks (Transport Block (TB)) / code words (Code Word (CW)) / different layers from each TRP of multiple TRPs. Alternatively, it is also possible to send the same TB / CW / layer from each TRP of multiple TRPs.

[0063] As a method of multi-TRP transmission, non-coherent joint transmission (NCJT) is being studied. In NCJT, for example, TRP1 performs modulation mapping and layer mapping on a first codeword, and transmits a first PDSCH using a first precoding for a first number of layers (e.g., 2 layers). In addition, TRP2 performs modulation mapping and layer mapping on a second codeword, and transmits a second PDSCH using a second precoding for a second number of layers (e.g., 2 layers).

[0064] In addition, multiple PDSCHs (multi-PDSCHs) subjected to NCJT may also be defined as partially or completely repeated with respect to at least one of the time domain and the frequency domain. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP may also be repeated.

[0065] It can also be assumed that the first PDSCH and the second PDSCH are not in a quasi-co-location (QCL) relationship (not quasi-co-located). The reception of multiple PDSCHs can also be rewritten as simultaneous reception of PDSCHs of a certain QCL type (eg, QCL type D).

[0066] In URLLC for multiple TRPs, support for PDSCH (transport block (TB) or codeword (CW)) repetition across multiple TRPs is being studied. Support for repetition across multiple TRPs in the frequency domain or layer (space) domain or time domain (URLLC schemes, such as schemes 1, 2a, 2b, 3, and 4) is being studied. In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexing (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexing (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RV can be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexing (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one time slot. In Scheme 4, multiple PDSCHs from multiple TRPs are sent in different time slots.

[0067] Based on such a multi-TRP scenario, more flexible transmission control using channels of good quality can be performed.

[0068] NCJT using multiple TRPs / panels may use high rank. In order to support ideal and non-ideal backhaul between multiple TRPs, single DCI (single PDCCH, for example, Figure 1B ) and multi-DCI (multi-PDCCH, e.g. Figure 1D ) For both single DCI and multiple DCI, the maximum number of TRPs can also be 2.

[0069] For single PDCCH design (mainly for ideal backhaul), TCI enhancement is being studied. Each TCI code point in DCI can also correspond to 1 or 2 TCI states. The TCI field size can also be the same as Rel.15.

[0070] For PDCCH / CORESET specified in Rel.15, a TCI state without a CORESET pool index (CORESETPoolIndex) (may also be referred to as TRP information (TRP Info)) is set for one CORESET.

[0071] For the enhancement of PDCCH / CORESET specified in Rel.16, in the multi-TRP based on multi-DCI, a CORESET pool index is set for each CORESET.

[0072] (Inter-cell mobility)

[0073] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (Multi-TRP (MTRP)) are being studied for DL ​​transmission to the UE. In addition, the UE is studying to perform UL transmission to one or more TRPs.

[0074] Consider that a UE receives channels / signals from multiple cells / TRPs in inter-cell mobility (e.g., L1 / L2 inter-cell mobility) (see Figure 2A , Figure 2B ).

[0075] Figure 2A An example of inter-cell mobility including non-serving cells (e.g., Single-TRP inter-cell mobility) is shown. The UE may also be set with one TRP (or, single TRP) in each cell. Here, a situation is shown where the UE receives channels / signals from the base station / TRP of cell #1, which is a serving cell, and the base station / TRP of cell #3, which is not a serving cell (a non-serving cell). For example, this is equivalent to a situation where the UE switches from cell #1 to cell #3 (e.g., fast cell switch). The TRP of the serving cell may also be referred to as a primary TRP (e.g., pTRP). The TRP of a non-serving cell may also be referred to as an additional TRP (aTRP).

[0076] In this case, the selection of the port (e.g., antenna port) / TRP may also be performed dynamically. The selection of the port (e.g., antenna port) / TRP may also be performed based on the TCI state indicated or updated by the DCI / MAC CE. Here, it is shown that different physical cell IDs (e.g., PCIs) are supported for cell #1 and cell #3.

[0077] Figure 2BAn example of a multi-TRP scenario (e.g., inter-cell mobility using multiple TRPs (Multi-TRP inter-cell mobility)) is shown. Multiple (e.g., 2) TRPs (or, different CORESET pool indexes) may be set for the UE in each cell. Here, a situation is shown where the UE receives channels / signals from TRP#1 and TRP2. In addition, here, a situation is shown where TRP#1 corresponds to physical cell ID (PCI) #1 and TRP#2 corresponds to PCI#2.

[0078] Multiple TRPs (TRP#1, #2) can also be connected through ideal / non-ideal backhaul to exchange information, data, etc. The same or different code words (Code Word (CW)) and the same or different layers can also be sent from each TRP of the multiple TRPs. As a method of sending multiple TRPs, Figure 2B As shown, non-coherent joint transmission (NCJT) can also be used. Here, NCJT is performed between TPRs corresponding to different PCIs. In addition, the same service cell setting can be applied / set for TRP#1 and TRP#2.

[0079] Multiple PDSCHs (multi-PDSCHs) subjected to NCJT may also be defined as partially or completely repeated with respect to at least one of the time domain and the frequency domain. That is, at least one of the time and frequency resources of the first PDSCH from TRP#1 and the second PDSCH from TRP#2 may also be repeated. The first PDSCH and the second PDSCH may be used for transmission of the same TB or for transmission of different TBs.

[0080] It is also conceivable that the first PDSCH and the second PDSCH are not in a quasi-co-location (QCL) relationship (not quasi-co-located). Reception of multiple PDSCHs may also be rewritten as simultaneous reception of PDSCHs of a certain QCL type (eg, QCL type D).

[0081] Multiple PDSCHs from multiple TRPs (also referred to as multiple PDSCHs) can also be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single master mode). One DCI can also be sent from one TRP in multiple TRPs. The structure of using one DCI in multiple TRPs can also be called multi-TRP (mTRP / MTRP) based on single DCI.

[0082] Multiple PDSCHs from multiple TRPs can also be scheduled (multi-master mode) using multiple DCIs (multiple DCI (M-DCI), multiple PDCCHs (multiple PDSCHs (multiple PDCCHs))). Multiple DCIs can also be sent from multiple TRPs separately. The structure of using multiple DCIs in multiple TRPs can also be called multi-TRP based on multiple DCIs (mTRP / MTRP).

[0083] It can also be imagined that the UE sends separate CSI reports (CSI reports) related to different TRPs. Such CSI feedback can also be referred to as separate feedback, separate CSI feedback, etc. In the present disclosure, "separate" and "independent" can also be rewritten.

[0084] In Rel.17 NR, it is assumed that: MAC CE / DCI is used to support beam indication of TCI status associated with different PCIs. On the other hand, in Rel.18 NR and later, it is assumed that: L1 / L2 signaling (e.g., DCI / MAC CE) is used to support serving cell switching (e.g., indicating the change of serving cell to a cell with a different PCI) (refer to Figure 3 ).

[0085] exist Figure 3 , it shows a situation where the UE switches the cell from the serving cell to the additional cell (or also called candidate cell, target cell) based on the cell switching instruction from the base station.

[0086] (Candidate cell)

[0087] It is also assumed that, in inter-cell mobility, one or more candidate cells are set and managed for each serving cell.

[0088] For example, in a specific high-level parameter (e.g., ServingCellConfig), one or more candidate cells (Alt.1) may be configured with limited information (e.g., only a portion of parameters are notified to the UE). It may also be configured in the same manner as the inter-cell beam management (inter-cell BM) of the existing system (e.g., Rel.17).

[0089] Alternatively, a complete configuration of more than one candidate cell (e.g., ServingCellConfig) may be configured, which is associated with each serving cell (Alt. 2). For example, a framework for carrier aggregation configuration (e.g., CA configuration framework) or a framework for CHO (Conditional Handover) / CPC (Conditional PSCell Change) configuration may be reused.

[0090] In Alt.1 / Alt.2, the activation / deactivation of candidate cells can also be controlled by MAC CE / DCI.

[0091] At least one of the following setting examples 1 to 3 may be applied as the setting of the candidate cell (refer to Figure 4 ). Here is shown an example of setting SpCell#0, SCell#1, and SCell#2 as serving cells, and setting / associating candidate cells (or additional cells) for serving cells / cell groups. The following setting examples 1 to 3 are examples, and the number of cells, the association of each cell, etc. are not limited to these, and may be changed appropriately. Alternatively, in addition to setting examples 1 to 3, other setting examples may be further supported / applied.

[0092] In the setting example 1, a case where one or more candidate cells are associated / set for each serving cell is shown (refer to Figure 4 ). Specifically, it shows the situation that SpCell#0 is associated with candidate cells #0-1, #0-2, and #0-3, SCell#1 is associated with candidate cells #1-1, and SCell#2 is associated with candidate cells #2-1 and #2-2. Information related to the association can also be set / indicated from the base station to the UE via RRC / MAC CE / DCI.

[0093] In setting example 2, the situation of associating / setting candidate cells for MAC entity / MCG / SCG is shown (refer to Figure 4). Specifically, the case of associating candidate cells #3-#8 with the MAC entity / MCG / SCG is shown. In this case, candidate cells are not associated with each service cell, but are set for the MAC entity or cell group (for example, MCG / SCG). Information related to the candidate cells set for each cell can also be set / indicated from the base station to the UE via RRC / MAC CE / DCI.

[0094] In setting example 3, more than one candidate cell group may be set (see Figure 4 ). Specifically, the situation that candidate cell group #1 having candidate cells #0-#2, candidate cell group #2 having candidate cells #0 and #1, and candidate cell group #3 having candidate cell #0 is set is shown. The candidate cell group has more than one candidate cell. The candidate cells included in the candidate cell group may also be associated with at least one of the serving cells. Information related to the candidate cells may also be set / indicated to the UE from the base station via RRC / MAC CE / DCI.

[0095] In an existing system (eg, Rel. 17), an L1 beam indication of a TCI state associated with an additional PCI (or an additional cell) is supported (eg, an indication based on a TCI state field of a DCI).

[0096] After Rel.18, it is envisaged to support a new L1 / L2 signal (e.g., DCI / MAC CE) for indicating the switching of a serving cell (e.g., serving cell switch). As the indication, it is envisaged to support at least one of an implicit indication and an explicit indication. An implicit indication may, for example, also mean that a certain CORESET is updated to a TCI state associated with an additional PCI through a MAC CE. An explicit indication may also mean directly indicating the switching of a cell through a DCI / MAC CE.

[0097] For example, in the example 1 of the candidate cell setting, a specific candidate cell may be designated as a serving cell (or a switching with a serving cell may be instructed) via L1 / L2 signaling. Figure 5A In FIG. 1 , the case where the candidate cell #0-2 becomes the SpCell of the MCG / SCG (switching SpCell #0 and candidate cell #0-2) through L1 / L2 signaling is shown. In addition, the case where the candidate cell #2-1 becomes the SCell of the MCG / SCG (switching SCell #2 and candidate cell #2-1) through L1 / L2 signaling is shown.

[0098] Alternatively, in the example 2 of setting the candidate cell, a specific candidate cell may be designated as a serving cell (or a switching with the serving cell may be instructed) via L1 / L2 signaling. Figure 5B , a case is shown in which the candidate cell #4 becomes the SpCell of the MCG / SCG (switching SpCell #0 and the candidate cell #4) through L1 / L2 signaling.

[0099] Alternatively, in the candidate cell setting example 3, a specific candidate cell group (or one or more candidate cells included in the specific candidate cell group) may be changed / updated to a serving cell group via L1 / L2 signaling. Figure 5C , a case is shown in which, through L1 / L2 signaling, candidate cell group #1 (or candidate cells #0-#2 included in candidate cell group #1) becomes the serving cell group (switching the serving cell group and candidate cell group #1).

[0100] (Timing Advance Group)

[0101] When using multiple TRPs, it may happen that the distance between the UE and each TRP is different. Multiple TRPs may also be included in the same cell (for example, a service cell). Alternatively, one of the multiple TRPs may be equivalent to a service cell, and the other TRPs may be equivalent to a non-service cell. In this case, it is also assumed that the distance between each TRP and the UE is different.

[0102] In existing systems, the transmission timing of UL (Uplink) channels and / or UL signals (UL channels / signals) is adjusted by timing advance (TA). The reception timing of UL channels / signals from different user terminals (UE) is adjusted on the wireless base station (also called TRP: Transmission and Reception Point, gNB: gNodeB, etc.) side.

[0103] The UE may also apply timing advance (multiple timing advances) for each preset timing advance group (TAG) to perform timing control of UL transmission.

[0104] When multiple timing advances are applied, a timing advance group (TAG) classified by transmission timing is supported. The UE can also assume that the same TA offset (or TA value) is applied to each TAG to control the UL transmission timing in each TAG. In other words, the TA offset can also be set independently for each TAG.

[0105] When multiple timing advances are applied, the UE independently adjusts the transmission timing of cells belonging to each TAG, thereby making it possible for the radio base station to adjust (align) the reception timing of uplink signals from the UE even when multiple cells are used.

[0106] TAG (for example, service cells belonging to the same TAG) can also be set by high-level parameters. The same timing advance value can also be applied to service cells belonging to the same TAG. The timing advance group of the SpCell containing the MAC entity can also be called the primary timing advance group (PTAG), and the other TAGs can also be called secondary timing advance groups (STAGs).

[0107] In the existing system (e.g., Rel.16 NR), a maximum of 4 TAGs are configured per cell group (e.g., MCG / SCG) (see Figure 6 ).exist Figure 6 In FIG. 1 , it is shown that three tags are set for a cell group including SpCell and SCell#1 to SCell#4. Here, it is shown that SpCell and SCell#1 belong to the first TAG (PTAG or TAG#0), SCell#2 and SCell#3 belong to the second TAG (TAG#1), and SCell#4 belongs to the third TAG (TAG#2).

[0108] The timing advance command (TA command) may also be notified to the UE using a MAC control element (e.g., MAC CE). The TA command is a command indicating a transmission timing value of an uplink channel and is included in the MAC control element. The TA command is a signaling notification from the wireless base station to the UE at the MAC layer. Based on the reception of the TA command, the UE controls a specific timer (e.g., a TA timer).

[0109] The MAC CE for the timing advance command (TAC MAC CE) may also be a structure including a field for the timing advance group index (eg, TAGID) and a field for the timing advance command (see Figure 7 ).

[0110] On the other hand, in future wireless communication systems, it is envisioned that different TAGs (or TAG-IDs) are set for more than one TRP corresponding to a certain cell (or CC). Alternatively, it is also envisioned that different TRPs corresponding to a certain cell share a common TAG. Alternatively, it is also envisioned that the MAC CE for TA commands is applied only to one TRP or that the MAC CE for TA commands is applied to multiple TRPs.

[0111] Alternatively, it is also envisioned that the TRPs corresponding to different cells use different TAGs / share a common TAG. For example, it is also envisioned that in inter-cell mobility, UL transmission is controlled based on a common / different timing advance for the serving cell (or the TRP of the serving cell) and the non-serving cell (or the TRP of the non-serving cell).

[0112] As described above, in MIMO after Rel. 18, it is also envisaged that two timing advances (TAs) for two TRPs are supported in a multi-TRP operation using multiple DCIs.

[0113] When TAG is set / controlled in units of TRP, a time alignment timer (e.g., timeAlignmentTimer) may also be set for each TRP. The time alignment timer may also be controlled by the MAC entity to be considered as the time during which the service cell belonging to the associated TAG is undergoing uplink time adjustment (e.g., uplink time alignment). For example, in order to maintain (e.g., maintain) UL time alignment, a time alignment timer (Time Alignment Timer) may also be set by RRC.

[0114] A time alignment timer (e.g., timeAlignementTimer) may also be maintained for UL time alignment. In Rel.17, a time alignment timer (e.g., timeAlignementTimer) corresponds to each TAG. Upon receiving a MAC CE for a timing advance command (e.g., TAC MAC CE), the UE starts or restarts (restarts) the time alignment timers respectively associated with the indicated timing advance groups (e.g., TAGs).

[0115] The MAC entity receives the TAC MAC CE and maintains a specific value (N TA ), apply the timing advance command for the indicated TAG, or start or restart (restart) the time alignment timer associated with the indicated TAG. TA ) can also be the timing advance between DL and UL.

[0116] The operation when the time alignment timer expires (expires) can also be defined separately in PTAG and STAG. In addition, the timing advance group (TAG) of the SpCell including the MAC entity can also be called the primary timing advance group (PTAG), and the other TAGs can be called secondary timing advance groups (STAG).

[0117] For example, Rel. 17 supports: when the timing advance timer corresponding to PTAG expires, a specific operation for PTAG is applied; when the timing advance timer corresponding to STAG expires, a specific operation for STAG is applied.

[0118] For example, when the time alignment timer expires, the following operations (eg, operations for a specific PTAG / operations for a specific STAG) may be performed.

[0119] [Specific PTAG operation]

[0120] In case the time alignment timer is associated with PTAG,

[0121] ・Flush (discard) all HARQ buffers of all serving cells.

[0122] ・When configured, notification is made in RRC to release PUCCH for all serving cells.

[0123] ・When set, notify in RRC to release SRS.

[0124] ・Clear all configured DL allocations and configured UL allocations.

[0125] ・Clear PUSCH resources used for semi-persistent CSI reporting.

[0126] ・Expire all running time alignment timers.

[0127] ・Maintain N of all tags TA .

[0128] [Specific STAG operation]

[0129] When the time alignment timer is associated with a STAG, for all serving cells belonging to the TAG,

[0130] ・Flush (discard) all HARQ buffers.

[0131] ・When configured, notify in RRC to release PUCCH.

[0132] ・When set, notify in RRC to release SRS.

[0133] ・Clear all configured DL allocation and UL allocation.

[0134] ・Clear PUSCH resources used for semi-persistent CSI reporting.

[0135] ・Maintain the N of this tag TA .

[0136] (TA control of TRP / panel units)

[0137] As described above, when communication is performed using a plurality of transmission and reception points (eg, TRPs) / panels, it is assumed that the timing advance (TA) is controlled for each TRP / each panel.

[0138] In NRs after Rel.18, for RACH triggered by PDCCH order and RACH triggered by UE, contention based random access (CBRA) and non-contention free random access (CFRA) are considered / determined in units of TRP or TRP TA (TA per TRP).

[0139] In the case of an application / setting that supports timing advance per TRP (or in units of TRP), the UE controls the UL transmission in each TRP based on the timing advance corresponding to each TRP (or the timing advance group to which each TRP belongs).

[0140] Information related to the TRP corresponding to each service cell (e.g., TRP index / TRP ID) can also be set / indicated from the base station to the UE using RRC / MAC CE / downlink control information. The UE can also receive associated information related to the timing advance corresponding to each TRP from the base station (e.g., information related to the TA value / timing advance command / time alignment timer, etc.).

[0141] Each embodiment of the present disclosure may also be applied to at least one of intra-cell multi-TRP (Intra-cell M-TRP) and inter-cell multi-TRP (Inter-cell M-TRP).

[0142] In intra-cell multi-TRP, multiple TRPs (or activated TCI states of multiple TRPs) can also be associated with the same cell ID. The cell ID can also be a physical cell ID (PCI).

[0143] In inter-cell multi-TRP, multiple TRPs (or activated TCI states of multiple TRPs) can also be associated with different cell IDs (e.g., PCIs). For example, in inter-cell multi-TRP, two TRPs can also be rewritten as two TRPs associated with two PCIs, respectively.

[0144] In the case of supporting application / setting of timing advance per TRP (or, in units of TRP), each TRP may also belong to a different TAG. Multiple TRPs (for example, two TRPs) of a serving cell may also belong to two TAGs respectively. A TAG may also contain multiple TRPs from multiple serving cells. All TRPs / serving cells within a TAG apply / maintain the same timing advance (TA) / the same time alignment timer.

[0145] In the present disclosure, a TAG may also contain more than one sub-TAG. For example, two TRPs of a serving cell may belong to two sub-TAGs respectively and belong to one TAG. A sub-TAG may also contain multiple TRPs from multiple serving cells. All TRPs / serving cells within a sub-TAG apply / maintain the same timing advance (TA) / the same time alignment timer.

[0146] For example, TA may be applied to each TRP (or indication may be made in units of TRP TA). For example, at least one of the following options may be applied.

[0147] [option 1]

[0148] It is also possible to set a different TAG-ID for each TRP and set a different MAC CE for TA command for each TRP. Each TAG may also maintain a time alignment timer for UL time alignment.

[0149] [Option 2]

[0150] Different TRPs may also share a TAG. The MAC CE for the TA command may also be applied to only one TRP. The UE may apply different TAs to other TRPs. For example, the UE may also adjust the TA value used for other TRPs (e.g., TRP#1) by a TA offset (TA_TRP_offset) based on the TA used for TRP#0 (TA_TRP#0).

[0151] In this case, there may also be only one time alignment timer for the UL time alignment of multiple TRPs. This may also mean that the UL time alignment of multiple TRPs is maintained or lost at the same time.

[0152] [Option 3]

[0153] The TAG may also be set to one. The TA command using MAC CE may also be applied to multiple service TRPs for the UE.

[0154] [Option 4]

[0155] TAG can also be set to one. The MAC CE for the TA command received in the TRP / CW / PDSCH / DMRS port group can also be applied to the same TRP / CW / PDSCH / DMRS port group of the TAG. Each TRP / CW / PDSCH / DMRS port group of the TAG maintains a time alignment timer for UL time alignment.

[0156] As such, after Rel.18, it is also envisioned to support multiple timing advances in multiple TRPs (e.g., multiple TRPs utilizing multiple DCIs). For example, for multiple TRPs utilizing multiple DCIs (e.g., two TRPs), multiple (e.g., 2) timing advances can also be supported. In addition, the application of multiple timing advances for multiple TRPs can be supported in intra-cell / inter-cell multi-DCI multi-TRP scenarios, and can also be supported in multiple frequency ranges (e.g., FR1 and FR2).

[0157] However, there are some situations in which the RACH process of each TRP (TRP TA) in the above-mentioned multiple TRPs is not sufficiently studied.

[0158] For example, in the case of CFRA, the method for setting / determining RACH resources for each TRP has not been sufficiently studied.

[0159] In addition, in the existing RACH process, at any time in the MAC entity, there is only one RACH process in progress. In the case where the UE triggers multiple (e.g., 2) RACH processes, how to handle them depends on the UE implementation. That is, the operation in the case of triggering multiple (e.g., 2) RACH processes for multiple (e.g., 2) TRPs is not fully studied.

[0160] In addition, when the UE wants to establish time alignment for a TRP of a cell, or when the UE determines that a TRP of a cell is "asynchronous", consider triggering a RACH process for the TRP by the UE.

[0161] If other TRPs of the considered cell are synchronized, the UE may request synchronization of the TRP for the other TRP via other UL signals (eg, Scheduling Request (SR) / MAC CE).

[0162] However, the operations involved in requests related to synchronization of the TRP are not sufficiently studied.

[0163] Furthermore, in the case of supporting application / setting of timing advance in units of TRP, there is insufficient research on how to control application of a timing advance command indicated by a specific MAC CE (eg, MAC RAR).

[0164] Furthermore, in the case of multiple (eg, 2) TRPs of one cell belonging to multiple (eg, 2) TAGs, it is considered necessary to enhance the operation in the existing system, but research thereof is insufficient.

[0165] In addition, in inter-cell mobility, the research on the RACH process for importing each TRP is insufficient.

[0166] If the above research is insufficient, the quality of communications utilizing multiple TRPs may deteriorate, and there is a concern that the improvement in communication throughput may be suppressed.

[0167] Therefore, the inventors of the present invention have conceived a means for solving the above-mentioned problems.

[0168] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0169] In the present disclosure, "A / B" and "at least one of A and B" may be replaced with each other. In addition, in the present disclosure, "A / B / C" may also mean "at least one of A, B, and C".

[0170] In the present disclosure, notification, activation, deactivation, indication (or indication), selection, configuration, update, determination, etc. may also be mutually rewritten. In the present disclosure, support, control, controllable, operation, and operation may also be mutually rewritten.

[0171] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, high-layer parameters, fields, Information Element (IE), settings, etc. may also be overwritten with each other. In the present disclosure, Medium Access Control (MAC) control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc. may also be overwritten with each other.

[0172] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0173] In the present disclosure, MAC signaling may also use, for example, MAC Control Element (MACCE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0174] In the present disclosure, the physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI)), etc.

[0175] In the present disclosure, an index, an identifier (ID), an indicator, a resource ID, etc. may also be overwritten with each other. In the present disclosure, a sequence, a list, a set, a group, a cluster, a subset, etc. may also be overwritten with each other.

[0176] In the present disclosure, panel, UE panel, panel group, beam, beam group, precoder, uplink (UL) transmission entity, transmission / reception point (TRP), base station, spatial relation information (SRI), spatial relation, SRS resource indicator (SRI), control resource set (CORESET), physical downlink shared channel (PDSCH), codeword (CW), transport block (TB), reference signal (RS), antenna port (e.g., demodulation reference signal (DMRS)) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, code division multiplexing (CDM)) group, reference signal group, CORESET group, physical uplink control channel (PDSCH)), codeword (CW), transport block (TB), reference signal (RS), antenna port (e.g., demodulation reference signal (DMRS)) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, code division multiplexing (CDM)) group, reference signal group, CORESET group, physical uplink control channel (PDSCH)), Channel (PUCCH)) group, PUCCH resource group), resources (for example, reference signal resources, SRS resources), resource sets (for example, reference signal resource sets), CORESET pool, downlink transmission configuration indication state (Transmission Configuration Indicationstate) (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL)), QCL assumptions, etc. can also be rewritten mutually.

[0177] In addition, the spatial relationship information identifier (Identifier (ID)) (TCI state ID) and the spatial relationship information (TCI state) can also be overwritten with each other. "Spatial relationship information" can also be overwritten with "a collection of spatial relationship information", "one or more spatial relationship information", etc. TCI state and TCI can also be overwritten with each other.

[0178] In the present disclosure, TRP, CORESET pool index (CORESETPoolIndex), TRP ID, ID related to TRP, TAG ID, TCI state group, spatial relationship group, QCL source RS group, DL RS group, path loss RS group, PCI (for multiple TRPs between cells) can also be rewritten with each other.

[0179] In the present disclosure, association with different TRPs, association with different CORESET pool indexes (CORESETPoolIndex), association with different TRP IDs, association with IDs related to different TRPs, association with different TAG IDs, association with groups of different TCI states, association with groups of different spatial relationships, association with groups of different QCL source RSs, association with groups of different DLRSs, association with groups of different path loss RSs, and association with different PCIs (for multiple TRPs between cells) can also be rewritten with each other.

[0180] The various embodiments of the present disclosure may also be applied to at least one of intra-cell multi-TRP and inter-cell multi-TRP.

[0181] In the present disclosure, intra-cell multi-TRP may also mean that activated TCI states of multiple (eg, 2) TRPs are associated with the same PCI.

[0182] In the present disclosure, inter-cell multi-TRP may also mean that activated TCI states of multiple (eg, 2) TRPs are associated with different PCIs.

[0183] In the present disclosure, in the case of inter-cell multi-TRP, multiple (eg, 2) TRPs may also mean multiple (eg, 2) TRPs associated with multiple (eg, 2) PCIs.

[0184] (Wireless Communication Method)

[0185] <First embodiment>

[0186] In the case of CFRA, the setting / determination method of RACH resources for each TRP has not been sufficiently studied.

[0187] In existing systems (up to Rel. 17), CFRA resources are provided in the RACH configuration (rach-ConfigDedicated).

[0188] When the CFRA resources associated with the SSB are explicitly provided in the RACH configuration (rach-ConfigDedicated), and among the associated SSBs, there is at least one SSB whose RSRP (SS-RSRP) exceeds a specific threshold (rsrp-ThresholdSSB) that can utilize the SSB, the UE selects an SSB whose SS-RSRP exceeds a specific threshold (rsrp-ThresholdSSB).

[0189] Next, the UE sets a random access preamble index (ra-PreambleIndex) corresponding to the selected SSB.

[0190] In addition, when the CFRA resources associated with the CSI-RS are explicitly provided in the RACH setting (rach-ConfigDedicated), and among the associated CSI-RS, at least one CSI-RS whose RSRP (CSI-RSRP) of the CSI-RS exceeds a specific threshold (rsrp-ThresholdCSI-RS) can be utilized, the UE selects a CSI-RS whose CSI-RSRP exceeds a specific threshold (rsrp-ThresholdCSI-RS).

[0191] Next, the UE sets a random access preamble index (ra-PreambleIndex) corresponding to the selected CSI-RS.

[0192] In the following first embodiment, a method for setting / determining RACH resources for each TRP is described.

[0193] The UE may also receive information related to the RACH resources corresponding to each TRP. Then, the UE may also control the RACH process in each TRP based on the information.

[0194] The UE may also determine one or more RACH resources according to specific rules / conditions.

[0195] The RACH resource may also be the RACH resource in the CFRA of each TRP. In the present disclosure, the RACH resource in the CFRA may also be referred to as the CFRA resource.

[0196] The specific rule / condition may also be at least one of the following options 1-1 to 1-3.

[0197] 《Option 1-1》

[0198] A (common) set (parameters) of CFRA resources may also be configured for the UE in the RACH configuration (eg, rach-ConfigDedicated).

[0199] The so-called (common) set may also refer to, for example, at least one of the following: a parameter representing an SSB resource list (e.g., ssb-ResourceList), a parameter representing a PRACH mask index for random access (RA) resource selection (e.g., ra-ssb-OccasionMaskIndex), a parameter representing a CSI-RS resource list (e.g., csi-rs-ResourceList), and a parameter representing a threshold related to CSI-RS (e.g., rsrp-ThresholdCSI-RS).

[0200] At least one of the following may be associated with each index related to the TRP: SSB, CSI-RS, random access preamble index (eg, ra-PreambleIndex), and PRACH opportunity (occasion).

[0201] [Option 1-1-1]

[0202] For CFRA triggered by PDCCH (or PDCCH command), the index related to TRP can also be indicated by the PDCCH. Alternatively, the index related to TRP can also be associated with the CORESET / TCI state of the PDCCH.

[0203] As for RA resources, they can also be determined based on the SSB / CSI-RS / ra-PreambleIndex / PRACH timing associated with the index related to TRP (or, they can be selected from the SSB / CSI-RS / ra-PreambleIndex / PRACH timing). The index related to TRP can be indicated by PDCCH or it can be an index related to TRP associated with PDCCH.

[0204] The method of selecting random access resources from SSB / CSI-RS / ra-PreambleIndex / PRACH opportunities may also apply rules in an existing system (eg, before Rel. 17).

[0205] [Option 1-1-2]

[0206] For CFRA triggered by specific events / conditions, the random access resources may also be determined based on the SSB / CSI-RS / ra-PreambleIndex / PRACH timing associated with the TRP (or may be selected from the SSB / CSI-RS / ra-PreambleIndex / PRACH timing).

[0207] The method of selecting random access resources from SSB / CSI-RS / ra-PreambleIndex / PRACH opportunities may also apply rules in an existing system (eg, before Rel. 17).

[0208] 《Option 1-2》

[0209] For the UE, multiple (e.g., 2) sets (parameters) of CFRA resources may also be set in the RACH setting (e.g., rach-ConfigDedicated) for multiple (e.g., 2) TRPs. In other words, for the UE, parameters related to the CFRA resources related to the first TRP and parameters related to the CFRA resources related to the second TRP may also be set separately.

[0210] The so-called set refers to, for example, at least one of the following: a parameter representing an SSB resource list (for example, ssb-ResourceList), a parameter representing a PRACH mask index for random access (RA) resource selection (for example, ra-ssb-OccasionMaskIndex), a parameter representing a CSI-RS resource list (for example, csi-rs-ResourceList), and a parameter representing a threshold related to CSI-RS (for example, rsrp-ThresholdCSI-RS).

[0211] The UE may also be configured with at least one of the following for each TRP: a parameter representing an SSB resource list (e.g., ssb-ResourceList), a parameter representing a PRACH mask index for random access (RA) resource selection (e.g., ra-ssb-OccasionMaskIndex), a parameter representing a CSI-RS resource list (e.g., csi-rs-ResourceList), and a parameter representing a threshold related to CSI-RS (e.g., rsrp-ThresholdCSI-RS).

[0212] Figure 8 is a diagram showing an example of RRC information elements involved in Option 1-2. Figure 8 In the example shown, an example is shown in which the CFRA resource is set separately according to the first TRP and the second TRP. Figure 8 It is written using the Abstract Syntax Notation One (ASN.1) notation (this is just an example).

[0213] exist Figure 8 In the example shown, the parameters included in the SSB-related parameters (ssb) and the CSI-RS-related parameters (csi-rs) in the parameters (resources) representing the resources of the CFRA include parameters for the first TRP and parameters for the second TRP.

[0214] Specifically, in Figure 8 In FIG, ssb-ResourceList, ra-ssb-OccasionMaskIndex, csi-rs-ResourceList, and rsrp-ThresholdCSI-RS are shown as parameters for the first TRP. Figure 8 In the figure, ssb-ResourceList-for TRP2-r18, ra-ssb-OccasionMaskIndex-for TRP2-r18, csi-rs-ResourceList-for TRP2-r18 and rsrp-ThresholdCSI-RS-for TRP2-r18 are shown as parameters for the second TRP.

[0215] The UE determines the CFRA resources for the first TRP based on the parameters for the first TRP, and determines the CFRA resources for the second TRP based on the parameters for the second TRP.

[0216] in addition, Figure 8 The names of the parameters shown are just examples and are not limited to these.

[0217] Fig. 9 is a diagram showing another example of RRC information elements involved in Option 1-2. Fig. 9 In the example shown above, Figure 8 Similarly, an example is shown in which the CFRA resource is set separately for the first TRP and the second TRP. Fig. 9 It is written using the Abstract Syntax Notation One (ASN.1) notation (this is just an example).

[0218] exist Fig. 9 In the example shown, for parameters (resources) indicating resources of CFRA, parameters for the first TRP and parameters for the second TRP are defined.

[0219] Specifically, in Fig. 9 In the figure, resources is shown as a parameter for the first TRP, and resources-forTRP2-r18 is shown as a parameter for the second TRP.

[0220] in addition, Fig. 9 The names of the parameters shown are just examples and are not limited to these.

[0221] The UE determines the CFRA resources for the first TRP based on the parameters for the first TRP, and determines the CFRA resources for the second TRP based on the parameters for the second TRP.

[0222] 《Options 1-3》

[0223] For the UE, multiple sets (parameters) of CFRA resources may be configured in the RACH configuration (eg, rach-ConfigDedicated) for multiple PCIs.

[0224] The parameters related to CFRA may be set for each PCI. The PCI may be, for example, at least one of the PCI of the serving cell and the PCI of the non-serving cell (additional PCI).

[0225] The parameter related to CFRA may also be any parameter included in the CFRA parameters in the RACH configuration (e.g., rach-ConfigDedicated). The parameter related to CFRA may also be, for example, at least one (or all) of the following: a parameter indicating RA opportunities of CFRA (e.g., occasions), a parameter indicating the configuration of random access opportunities of CFRA (e.g., rach-ConfigGeneric), a parameter indicating the number of SSBs per RACH opportunity (e.g., ssb-perRACH-Occasion), a parameter indicating resources of CFRA (e.g., resources), a parameter indicating an SSB resource list (e.g., ssb-ResourceList), a parameter indicating a PRACH mask index for RA resource selection (e.g., ra-ssb-OccasionMaskIndex), a parameter indicating a CSI-RS resource list (e.g., csi-rs-ResourceList), and a parameter indicating a threshold related to CSI-RS (e.g., rsrp-ThresholdCSI-RS).

[0226] Option 1-3 can also be applied to inter-cell M-TRP. In addition, Option 1-3 can also be applied to mobility (specified in Rel.18).

[0227] In the inter-cell M-TRP (specified in Rel.17), up to 7 additional PCIs can be set, and the TCI status of different PCIs can be changed through MAC CE. Therefore, it is expected that the RACH-related settings for multiple (for example, all) PCIs can be performed through RRC signaling.

[0228] Fig.10 is a diagram showing an example of RRC information elements involved in options 1-3. Fig.10 In the example shown, the CFRA resource is set separately for each PCI. Fig.10 It is written using the Abstract Syntax Notation One (ASN.1) notation (this is just an example).

[0229] exist Fig.10 In the example shown, a parameter (CFRA) related to CFRA corresponding to the PCI of the serving cell, a parameter (CFRA-for non serving cell 1-r18) related to CFRA corresponding to the PCI of the first non-serving cell, and a parameter (CFRA-for nonserving cell N-r18) related to CFRA corresponding to the PCI of the Nth (N is an arbitrary integer) non-serving cell are shown. These parameters may also respectively include at least one (or all) of the parameters related to the above-mentioned CFRA.

[0230] The UE may also determine the CFRA resources based on the RACH settings corresponding to the PCI.

[0231] in addition, Fig.10 The parameter names shown are examples only and are not limited to these. Fig.10 , the parameters related to CFRA corresponding to the PCI of the Nth (N is an arbitrary integer) non-serving cell (CFRA-for nonserving cell N-r18) are shown as an example, but the parameters related to CFRA corresponding to the PCI of the second, third, ... non-serving cells may also be specified.

[0232] In the first embodiment, CFRA may also be triggered for one TRP. Triggering CFRA for one TRP may also mean, for example, at least one of the following: one TRP of the serving cell is in a "non-synchronized" state, and (CFRA) is triggered for establishing time alignment for one TRP of the serving cell.

[0233] In the case where CFRA is triggered for a TRP, the UE may also select / determine random access resources from the SSB / CSI-RS / ra-PreambleIndex / PRACH opportunities associated with the TRP and provided in the RACH setting (e.g., rach-ConfigDedicated).

[0234] In the present disclosure, a TRP is "asynchronous", which may also mean that a time alignment timer associated with the TRP (eg, timeAlignmentTimer or timeAlignmentTimer associated with a TAG to which the TRP belongs) expires.

[0235] According to the above first embodiment, the CFRA resources for each TRP can be appropriately determined.

[0236] <Second embodiment>

[0237] In the existing RACH process, at any time of the MAC entity, there is only one RACH process in progress. In the case where the UE triggers multiple (eg, 2) RACH processes, how to handle them depends on the implementation of the UE.

[0238] That is, there is insufficient research on the operation when multiple (e.g., 2) RACH processes are triggered for multiple (e.g., 2) TRPs.

[0239] In the following second embodiment, the operation (enhanced function) of the UE when multiple RACH procedures are triggered will be described.

[0240] In the MAC entity, a new (second) RACH process may also be triggered while a (first) RACH process is in progress. The UE may also receive the setting of the triggered new RACH process. The first RACH process and the second RACH process may also be associated with different TRPs, respectively.

[0241] In the present disclosure, multiple (2) RACH processes are respectively associated with different TRPs, which may also mean at least one of the following:

[0242] ・The PDCCH orders of multiple RACH processes indicate different TRPs.

[0243] ・The PDCCH commands of multiple RACH processes are associated with different TRPs.

[0244] ・The RACH resources (e.g., SSB / CSI-RS / preamble index / PRACH timing) of multiple RACH processes are associated with different TRPs.

[0245] ・Multiple RACH processes are triggered according to the "non-synchronized" status of different TRPs.

[0246] ・Multiple RACH processes are triggered to establish time alignment for different TRPs.

[0247] The UE may also follow at least one of the following options 2-1 and 2-2.

[0248] 《Option 2-1》

[0249] The UE may also determine whether to continue the first RACH process or start the second RACH process.

[0250] This judgment may also depend on the implementation of the UE. In this case, the UE may also judge whether to continue the first RACH process or start the second RACH process based on specific rules / conditions.

[0251] Option 2-2

[0252] The UE can also prioritize the RACH process associated with a specific TRP.

[0253] Option 2-2 is roughly divided into the following options 2-2-1 to 2-2-4.

[0254] [Select 2-2-1]

[0255] A specific TRP may be, for example, a TRP with a specific TRP ID.

[0256] The specific TRP ID may also be, for example, the lowest (or maximum) TRP ID.

[0257] The specific TRP ID may be, for example, a TRP ID having a value of 0 (or 1).

[0258] [Select 2-2-2]

[0259] A specific TRP may be, for example, a TRP associated with a specific PCI.

[0260] The specific PCI may be, for example, the PCI of the serving cell or any additional PCI.

[0261] [Select 2-2-3]

[0262] A specific TRP may be, for example, a TRP associated with a specific TAG.

[0263] The specific TAG may be, for example, PTAG or STAG.

[0264] [Select 2-2-4]

[0265] It is also possible to set an index related to priority for each TRP.

[0266] The UE may also prioritize the RACH process associated with a specific TRP based on a priority-related index.

[0267] The specific TRP may also be, for example, a TRP to which a higher (or lower) priority index is set. A higher value priority index may also indicate a higher priority, and a lower value priority index may also indicate a higher priority.

[0268] In the present disclosure, prioritizing a RACH process associated with a specific TRP may also mean that, in the MAC entity, when a higher priority RACH process is already in progress and a lower priority RACH process is newly triggered, the UE continues the ongoing higher priority RACH process.

[0269] In the present disclosure, prioritizing a RACH process associated with a specific TRP may also mean that in the MAC entity, when a lower priority RACH process is already in progress and a higher priority RACH process is newly triggered, the UE stops the ongoing lower priority RACH process and newly starts the higher priority RACH process.

[0270] Fig.11 FIG. 2 is a diagram showing an example of the RACH priority operation involved in Option 2-2. Fig.11 In the example shown, a situation is shown in which a RACH procedure for a first TRP (TRP#1) is in progress and another RACH procedure for a second TRP (TRP#2) is triggered in the middle.

[0271] exist Fig.11 In the example shown, when TRP#1 is prioritized, the ongoing RACH process for TRP#1 is maintained and other RACH processes for TRP#2 are not processed in the UE.

[0272] exist Fig.11 In the example shown, when TRP#2 is prioritized, the ongoing RACH process for TRP#1 is stopped and the UE newly starts another RACH process for TRP#2.

[0273] According to the second embodiment described above, even when a plurality of RACH procedures are triggered, it is possible to appropriately perform processing of the RACH procedure.

[0274] <Third embodiment>

[0275] In the case where the UE wants to establish time alignment for a TRP of a cell, or in the case where the UE determines that a TRP of a cell is "asynchronous", consider triggering a RACH process for the TRP.

[0276] If other TRPs of the cell are considered to be synchronized, the UE may request synchronization of the TRP for the other TRP via other UL signals (eg, Scheduling Request (SR) / MAC CE).

[0277] However, the operations involved in requests related to synchronization of the TRP are not sufficiently studied.

[0278] In the following third embodiment, operations related to requests related to synchronization of the TRP are described.

[0279] The specific UL signal may be, for example, a scheduling request (SR) / MAC CE.

[0280] The UE may also send the request to the NW when certain conditions are met.

[0281] The specific condition may also be based on, for example, at least one of the following: a (UL) synchronization status of each TRP, and establishment of time alignment of each TRP.

[0282] For example, in the case where (at least) one TRP of the serving cell is judged to be "asynchronous", the UE may also use a specific UL signal to request UL time synchronization of the TRP. In addition, for example, in the case where it is judged that time alignment of (at least) one TRP of the serving cell needs to be established, a specific UL signal may also be used to request UL time synchronization of the TRP.

[0283] When the specific UL signal is SR, for the UE, a (unique (dedicated)) SR / PUCCH resource for requesting UL time synchronization of TRP may be set.

[0284] This (unique (dedicated)) SR / PUCCH resource can also be set for each TRP / each TAG.

[0285] In the case where the specific UL signal is a MAC CE, at least one of the following information may also be included in the MAC CE:

[0286] ・TRP index of the asynchronous TRP.

[0287] ・Cell index of asynchronous TRP.

[0288] ・TAG index of asynchronous TRP.

[0289] In the present disclosure, TRP being asynchronous may also mean that a time alignment timer (eg, timeAlignmentTimer) associated with the TRP expires.

[0290] After sending the UL time synchronization request, the UE may use a specific DL signal (eg, PDCCH / PDSCH) to receive a response signal for the request, or may not receive the response signal.

[0291] The UE may also assume / judge that after sending the UL time synchronization request, the target TRP enters the "synchronized" state after a specific period of time.

[0292] In addition, the UE may also assume / judge that the TRP being the object enters the "synchronized" state after a specific period of time has passed after receiving the response signal to the request.

[0293] In addition, the specific period may be pre-defined in the specification, may be notified to the UE via higher layer signaling (RRC / MACCE), may be indicated to the UE via DCI, or may be determined based on reported UE capability information.

[0294] Fig.12 FIG. 4 is a diagram showing an example of a UL time synchronization request according to the third embodiment. Fig.12 In the example shown, when it is determined that (at least) one TRP of the serving cell is "asynchronous", the UE sends a UL time synchronization request to the NW.

[0295] The third embodiment may also be applied only in the following cases:

[0296] ・One of the multiple TRPs of the serving cell is asynchronous, and the other TRPs are synchronized (that is, when any one of the multiple TRPs is asynchronous, the UE can trigger RACH without applying this embodiment).

[0297] ・An asynchronous TRP belongs to a specific cell (eg, SCell).

[0298] ・Asynchronous TRPs belong to a specific TAG (e.g., STAG).

[0299] ・(In the case of multiple TRPs within a cell,) the asynchronous TRP belongs to a specific cell (for example, a non-serving cell (a cell associated with the PCI of the non-serving cell)).

[0300] The third embodiment can also be applied in at least one of the following situations: the situation where the UE wants (needs) to establish time alignment for a TRP of a cell; the situation where the UE judges at least one TRP of a cell to be "asynchronous"; and the situation where the UE judges one TRP of a cell to be "synchronous" and other TRPs to be "asynchronous".

[0301] According to the above third embodiment, it is possible to appropriately send a request for asynchronous UL time synchronization for TRP.

[0302] <Fourth embodiment>

[0303] In the fourth embodiment, when a timing advance command (TAC (for example, one TAC)) indicated by a random access response (RAR) is applied to one TRP of a serving cell, a method of determining one TRP to which the TAC is applied is described.

[0304] The UE may also receive the TAC through the RAR for a serving cell for which multiple TRPs are configured. When two TAs for the multiple TRPs are supported, the UE may also apply the TAC indicated by the RAR to any TRP of the serving cell.

[0305] The TRP (eg, one TRP) to which the TAC indicated by the RAR is applied may also be determined based on at least one of the following options 4-1 to 4-3.

[0306] 《Option 4-1》

[0307] A TRP index may also be associated with a specific CORESET / TCI state.

[0308] The specific CORESET / TCI state may also be the CORESET / TCI state of the PDCCH that schedules the RAR.

[0309] The TAC contained in the RAR may also be applied to the TRP of the TRP index associated with a specific CORESET / TCI state.

[0310] In addition, in the present disclosure, the PDCCH scheduling RAR may also mean the following PDCCH: the UE attempts to detect in response to PRACH transmission, and the PDCCH transmits a DCI format (DCI format 1_0), which is attempted to be detected by the UE and the CRC is scrambled by the corresponding RA-RNTI within the window controlled by the higher layer.

[0311] 《Option 4-2》

[0312] A TRP index can also be associated with a specific TCI state.

[0313] The specific TCI state may also be the TCI state of the PDSCH transmitting the RAR.

[0314] The TAC contained in the RAR may also be applied to the TRP of the TRP index associated with a specific TCI state.

[0315] 《Option 4-3》

[0316] The TRP to which TAC is applied may also be pre-defined in the specification.

[0317] For example, the UE may also determine to apply the TAC to the TRP associated with a specific TAG.

[0318] For example, the specific TAG may also be a TAG with a lower (or higher) TAG ID.

[0319] For example, when a certain TRP is associated with PTAG and other TRPs are associated with STAG, the specific TAG may also be PTAG (or STAG).

[0320] The above options to be applied may also be determined based on the type of RACH. For example, for each of the RACH triggered by the PDCCH command and the RACH triggered by the UE, different options among the above options may be applied, or a common option may be applied.

[0321] In the present disclosure, applying a TAC to a TRP may also mean applying the TAC to the TAG associated with the TRP.

[0322] In addition, in the case of RACH triggered by the UE, the TAC in the MAC RAR can also be applied to multiple (2, both) TRPs. In the case of RACH triggered by a PDCCH command, the TAC in the MAC RAR can also be applied to one TRP determined by at least one of the above options.

[0323] According to the fourth embodiment described above, the TRP to which the TAC is applied can be appropriately determined.

[0324] <Fifth embodiment>

[0325] In the existing system, when the MAC entity stops the UL transmission of the SCell because the maximum UL transmission timing difference between the tags of the MAC entity or the maximum UL transmission timing difference between the tags of any MAC entity of the UE is exceeded, the MAC entity determines that the time alignment timer (timeAlignmentTimer) associated with the SCell has expired.

[0326] In addition, in the existing system, when the time alignment timer associated with the TAG to which the serving cell belongs is not operating and the Small Data Transmission (CG-SDT) process based on the set permission is not in progress, the MAC entity does not perform UL transmission in the serving cell other than the random access preamble and message A (MSG A).

[0327] Such operations in the existing system are set for each cell. However, in the case of multiple (for example, 2) TRPs in one cell belonging to multiple (for example, 2) TAGs, enhancement of these operations is considered necessary, but research on them is not sufficient.

[0328] In the following fifth embodiment, enhancement of the above-mentioned operations to multiple TRPs and operations related to the TA of each TRP is described.

[0329] When the first condition is met, the UE (MAC entity) may also determine that the time alignment timer (eg, timeAlignmentTimer) associated with the TRP of the serving cell has expired.

[0330] The first condition may be, for example, a situation where the MAC entity stops UL transmission of the SCell due to exceeding at least one of the maximum UL transmission timing difference between TAGs of the MAC entity and the maximum UL transmission timing difference between TAGs of any MAC entity of the UE.

[0331] The above-mentioned service cell may also be, for example, PCell / PSCell / SCell.

[0332] When the second condition is met, the UE (MAC entity) may also determine not to perform a specific UL transmission associated with a TRP of the serving cell.

[0333] The second condition may also be that the time alignment timer associated with the TAG to which the TRP of the serving cell belongs is not operating and the Small Data Transmission (CG-SDT) process based on the set permission is not in progress.

[0334] The specific UL transmission may be UL transmission other than the transmission of the random access preamble and the message A (MSG A).

[0335] According to the above fifth embodiment, even when using multiple TRPs and a TA for each TRP, it is possible to enhance the existing specification operation and perform appropriate UL transmission control.

[0336] <Sixth embodiment (modification of the first embodiment)>

[0337] The sixth embodiment below describes an example in which the first embodiment described above is applied to inter-cell mobility. Specifically, a method for setting / determining RACH resources for each candidate cell is described.

[0338] The UE can also be set with multiple TRPs between cells.

[0339] The UE may also receive information about the RACH resources corresponding to each candidate cell. Then, the UE may also control the RACH process in each candidate cell based on the information.

[0340] The UE may also determine one or more RACH resources according to specific rules / conditions.

[0341] The RACH resource may also be a RACH resource in the CFRA of each candidate cell.

[0342] The specific rule / condition may also be at least one of the following options 6-1 and 6-2.

[0343] 《Option 6-1》

[0344] For the UE, a (common) set (parameters) of CFRA resources may also be configured in the RACH configuration (eg, rach-ConfigDedicated).

[0345] The one (common) set (parameter) of CFRA resources may also be a set (parameter) for multiple (eg, all) cells including a serving cell and one or more candidate cells.

[0346] The so-called one (common) set may, for example, be at least one of the following: a parameter representing an SSB resource list (e.g., ssb-ResourceList), a parameter representing a PRACH mask index for random access (RA) resource selection (e.g., ra-ssb-OccasionMaskIndex), a parameter representing a CSI-RS resource list (e.g., csi-rs-ResourceList), and a parameter representing a threshold related to CSI-RS (e.g., rsrp-ThresholdCSI-RS).

[0347] At least one of the SSB, CSI-RS, random access preamble index (eg, ra-PreambleIndex), and PRACH opportunity (occasion) may also be associated with each of the cell indexes.

[0348] Option 6-2

[0349] For the UE, multiple sets (parameters) of CFRA resources may also be configured in the RACH configuration (eg, rach-ConfigDedicated) for multiple candidate cells.

[0350] Parameters related to CFRA may be set for each candidate cell.

[0351] The parameter related to CFRA may also be any parameter included in the CFRA parameters in the RACH configuration (e.g., rach-ConfigDedicated). The parameter related to CFRA may also be, for example, at least one (or all) of the following: a parameter indicating RA opportunities of CFRA (e.g., occasions), a parameter indicating the configuration of random access opportunities of CFRA (e.g., rach-ConfigGeneric), a parameter indicating the number of SSBs per RACH opportunity (e.g., ssb-perRACH-Occasion), a parameter indicating resources of CFRA (e.g., resources), a parameter indicating an SSB resource list (e.g., ssb-ResourceList), a parameter indicating a PRACH mask index for RA resource selection (e.g., ra-ssb-OccasionMaskIndex), a parameter indicating a CSI-RS resource list (e.g., csi-rs-ResourceList), and a parameter indicating a threshold related to CSI-RS (e.g., rsrp-ThresholdCSI-RS).

[0352] In the present disclosure, the candidate cell may be a cell associated with the serving cell / additional cell, or may be the same as or different from the serving cell.

[0353] In the sixth embodiment, CFRA may be triggered for one cell. Triggering CFRA for one cell may also mean, for example, at least one of the following: the cell (including the serving cell / the additional cell) is in a "non-synchronized" state, and (CFRA) is triggered for establishing time alignment for the cell (including the serving cell / the additional cell).

[0354] In the case where CFRA is triggered for a cell, the UE may also select / determine random access resources from the SSB / CSI-RS / ra-PreambleIndex / PRACH opportunities associated with the cell and provided in the RACH configuration (eg, rach-ConfigDedicated).

[0355] In the present disclosure, a cell being "unsynchronized" may also mean that a time alignment timer associated with the cell (eg, timeAlignmentTimer or timeAlignmentTimer associated with a TAG to which the cell belongs) expires.

[0356] According to the sixth embodiment described above, it is possible to appropriately determine the CFRA resource for each cell in inter-cell mobility.

[0357] <Seventh Embodiment (Modification of Second Embodiment)>

[0358] The seventh embodiment below describes an example in which the second embodiment described above is applied to inter-cell mobility. Specifically, the operation (enhanced function) of the UE when multiple RACH procedures are triggered is described.

[0359] The UE can also be set with multiple TRPs between cells.

[0360] In the MAC entity, a new (second) RACH process may also be triggered while a (first) RACH process is in progress. The first RACH process and the second RACH process may also be associated with different cells (eg, cells including a serving cell / additional cell).

[0361] In the present disclosure, multiple RACH processes are respectively associated with different cells and may also mean at least one of the following:

[0362] ・The PDCCH orders of multiple RACH processes indicate different cells respectively.

[0363] ・The PDCCH orders of multiple RACH processes are associated with different cells.

[0364] ・The RACH resources (e.g., SSB / CSI-RS / preamble index / PRACH timing) of multiple RACH processes are associated with different cells.

[0365] ・Multiple RACH processes are triggered according to the "non-synchronized" status of different cells.

[0366] ・Multiple RACH procedures are triggered to establish time alignment for different cells.

[0367] The UE may also follow at least one of the following options 7-1 and 7-2.

[0368] 《Option 7-1》

[0369] The UE may also determine whether to continue the first RACH process or start the second RACH process.

[0370] This judgment may also depend on the implementation of the UE. In this case, the UE may also judge whether to continue the first RACH process or start the second RACH process based on specific rules / conditions.

[0371] Option 7-2

[0372] The UE may also prioritize the RACH procedures associated with a specific cell.

[0373] Option 7-2 is roughly divided into the following options 7-2-1 to 7-2-4.

[0374] [Select 7-2-1]

[0375] The specific cell may be, for example, a cell having a specific cell index.

[0376] The cell index may be, for example, the lowest (or maximum) cell index.

[0377] [Select 7-2-2]

[0378] The specific cell may be, for example, a serving cell.

[0379] The UE may also prioritize the RACH procedure associated with the serving cell.

[0380] The UE may also prioritize the RACH process of the TRP associated with the serving cell.

[0381] [Select 7-2-3]

[0382] The specific cell may be, for example, a cell associated with a specific TAG.

[0383] The specific TAG may be, for example, PTAG or STAG.

[0384] The UE may also prioritize the RACH procedure of cells associated with a specific TAG.

[0385] The UE may also prioritize the RACH process of the TRP associated with the cell associated with a specific TAG.

[0386] [Select 7-2-4]

[0387] An index related to priority may be set for each cell.

[0388] The UE may also prioritize the RACH procedure associated with a specific cell based on an index related to the priority.

[0389] The specific cell may be, for example, a cell to which a higher (or lower) priority index is set. A higher priority index may indicate a higher priority, and a lower priority index may indicate a higher priority.

[0390] In the present disclosure, prioritizing a RACH procedure associated with a specific cell may also mean that, in a MAC entity, when a higher priority RACH procedure is already in progress and a lower priority RACH procedure is newly triggered, the UE continues the ongoing higher priority RACH procedure.

[0391] In the present disclosure, prioritizing a RACH process associated with a specific cell may also mean that, in the MAC entity, when a lower priority RACH process is already in progress and a higher priority RACH process is newly triggered, the UE stops the ongoing lower priority RACH process and newly starts the higher priority RACH process.

[0392] Fig.13 FIG. 7 is a diagram showing an example of the RACH priority operation involved in Option 7-2. Fig.13 In the example shown, a RACH procedure for a first cell (cell #1) is in progress, and another RACH procedure for a second cell (cell #2) is triggered during the process.

[0393] exist Fig.13 In the example shown, when cell #1 is prioritized, the ongoing RACH procedure for cell #1 is maintained, and other RACH procedures for cell #2 are not performed in the UE.

[0394] exist Fig.13 In the example shown, when cell #2 is prioritized, the ongoing RACH procedure for cell #1 is stopped, and the UE newly starts another RACH procedure for cell #2.

[0395] According to the seventh embodiment described above, even when a plurality of RACH procedures are triggered, it is possible to appropriately perform processing of the RACH procedures.

[0396] <Eighth Embodiment (Modification of Third Embodiment)>

[0397] The eighth embodiment below describes an example in which the third embodiment described above is applied to inter-cell mobility. Specifically, the operation related to a request related to synchronization of cells (for example, cells including a serving cell / additional cell) is described.

[0398] The UE can also be set with multiple TRPs between cells.

[0399] The UE may also use a specific UL signal to request the NW (eg, a base station) for UL time synchronization of a cell (eg, a cell including a serving cell / an additional cell).

[0400] The UE may also request UL time synchronization of the TRP from the network (NW, for example, a base station) using a specific UL signal when specific conditions are met.

[0401] The situation in which the specific condition is satisfied may refer to, for example, at least one of the following: the (UL) synchronization state of each TRP and the establishment of time alignment of each TRP.

[0402] For example, when a TRP of a cell is judged to be "asynchronous", the UE may also use a specific UL signal to request UL time synchronization of the TRP. In addition, for example, when it is judged that time alignment of a TRP of a cell needs to be established, a specific UL signal may also be used to request UL time synchronization of the TRP.

[0403] The specific UL signal may be, for example, a scheduling request (SR) / MAC CE.

[0404] The UE may also send the request to the NW when certain conditions are met.

[0405] The specific condition may also be based on, for example, at least one of the following: a (UL) synchronization state of each cell, and establishment of time alignment of each cell.

[0406] The specific condition may be, for example, when (the synchronization state of) the cell is "asynchronous".

[0407] For example, when a cell is judged to be "asynchronous", the UE may also use a specific UL signal to request UL time synchronization of the cell.

[0408] When the specific UL signal is an SR, a (unique (dedicated)) SR / PUCCH resource for requesting UL time synchronization of the cell may be configured for the UE.

[0409] The (unique (dedicated)) SR / PUCCH resource may be set for each cell / each TAG.

[0410] In the case where the specific UL signal is a MAC CE, at least one of the following information may also be included in the MAC CE:

[0411] ・Cell index of the asynchronous cell.

[0412] ・TAG index associated with the unsynchronized cell.

[0413] In the present disclosure, a cell being unsynchronized may also mean that a time alignment timer (eg, timeAlignmentTimer) associated with the cell or a TAG of the cell expires.

[0414] After sending the UL time synchronization request, the UE may use a specific DL signal (eg, PDCCH / PDSCH) to receive a response signal for the request, or may not receive the response signal.

[0415] The UE may also assume / judge that after sending the UL time synchronization request, the target TRP enters the "synchronized" state after a specific period of time.

[0416] In addition, the UE may also assume / judge that the TRP being the object enters the "synchronized" state after a specific period of time has passed after receiving the response signal to the request.

[0417] In addition, the specific period may be pre-defined in the specification, may be notified to the UE through higher layer signaling (RRC / MACCE), may be indicated to the UE through DCI, or may be determined based on reported UE capability information.

[0418] The eighth embodiment may be applied only when the asynchronous cell is a specific cell (for example, a non-serving cell).

[0419] According to the eighth embodiment described above, it is possible to appropriately transmit a request for asynchronous UL time synchronization of cells in inter-cell mobility.

[0420] <Supplement>

[0421] [Notification of information to UE]

[0422] In the above-mentioned embodiments, the notification of arbitrary information from the network (Network (NW)) (for example, from the base station (Base Station (BS))) to the UE (in other words, the reception of arbitrary information from the BS in the UE) can also be carried out using physical layer signaling (for example, DCI), high-layer signaling (for example, RRC signaling, MAC CE), specific signals / channels (for example, PDCCH, PDSCH, reference signals) or a combination thereof.

[0423] When the above notification is performed by MAC CE, the MAC CE may be identified by including a new logical channel ID (Logical Channel ID (LCID)) not specified in the existing standard in the MAC subheader.

[0424] When the notification is performed through DCI, the notification may be performed through a specific field of the DCI, a scrambled Radio Network Temporary Identifier (RNTI) used to assign cyclic redundancy check (CRC) bits to the DCI, the format of the DCI, etc.

[0425] In addition, notification of any information in the above-mentioned embodiments to the UE may be performed periodically, semi-continuously, or aperiodically.

[0426] [Notification of information from UE]

[0427] The notification of arbitrary information from the UE (to the NW) in the above-mentioned implementation manner (in other words, the sending / reporting of arbitrary information in the UE to the BS) can also be carried out using physical layer signaling (e.g., UCI), high-layer signaling (e.g., RRC signaling, MACCE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals) or a combination thereof.

[0428] In the case where the above notification is performed through MAC CE, the MAC CE can also be identified by including a new LCID that is not specified in the existing standards in the MAC subheader.

[0429] When the above notification is performed through UCI, the above notification can also be sent using PUCCH or PUSCH.

[0430] In addition, the notification of arbitrary information from the UE in the above-mentioned embodiments may be performed periodically, semi-continuously, or aperiodically.

[0431] [About application of each embodiment]

[0432] At least one of the above-mentioned implementation modes may also be applied when a specific condition is met. The specific condition may be specified in the standard or may be notified to the UE / BS using high-layer signaling / physical layer signaling.

[0433] At least one of the above-mentioned implementation modes may also be applied only to a UE that reports a specific UE capability (UE capability) or supports the specific UE capability.

[0434] The specific UE capability may also indicate at least one of the following:

[0435] ・Supporting specific processing / operation / control / information related to at least one of the above embodiments,

[0436] ・Support multiple (e.g., 2) TAs for multiple TRPs,

[0437] ・Support multiple (e.g., 2) TAs for intra-cell M-TRP,

[0438] ・Supports multiple (e.g., 2) TAs for inter-cell M-TRP,

[0439] ・Support L1 / L2 inter-cell mobility.

[0440] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied across the entire frequency (commonly regardless of the frequency), or capabilities for each frequency (for example, one or a combination of cells, bands, band combinations, BWPs, component carriers, etc.), or capabilities for each frequency range (for example, frequency range 1 (Frequency Range 1 (FR1)), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities for each subcarrier spacing (SubCarrier Spacing (SCS)), or capabilities for each feature set (Feature Set (FS)) or feature set per component carrier (Feature Set Per Component-carrier (FSPC)).

[0441] Furthermore, the specific UE capability may be a capability applied in all duplex modes (commonly regardless of the duplex mode) or a capability for each duplex mode (eg, time division duplex (TDD) or frequency division duplex (FDD)).

[0442] In addition, at least one of the above-mentioned embodiments may also be applied to the case where the UE is set / activated / triggered with specific information associated with the above-mentioned embodiments (or the operation of the above-mentioned embodiments is implemented) through high-layer signaling / physical layer signaling. For example, the specific information may also be information indicating activation of multiple TAs for multiple TRPs, information indicating activation of multiple TAs for multiple TRPs within a cell, information indicating activation of multiple TAs for multiple TRPs between cells, information indicating activation of L1 / L2 inter-cell mobility, any RRC parameter for a specific version (e.g., Rel.18 / 19), etc.

[0443] When the UE does not support at least one of the above-mentioned specific UE capabilities or is not configured with the above-mentioned specific information, the UE may also apply the operations of Rel.15 / 16, for example.

[0444] (Note A)

[0445] The following inventions are added to one embodiment of the present disclosure.

[0446] [Supplement A-1]

[0447] A terminal having:

[0448] A receiving unit receives first information about a resource of a contention-free random access (CFRA) corresponding to a first transmission reception point (TRP) and second information about a resource of a CFRA corresponding to a second TRP; and

[0449] A control unit controls the CFRA process in the first TRP based on the first information, and controls the CFRA process in the second TRP based on the second information.

[0450] [Supplement A-2]

[0451] A terminal as described in Supplement A-1, wherein:

[0452] The first information and the second information are common information.

[0453] [Supplement A-3]

[0454] A terminal as described in Supplement A-1 or Supplement A-2, wherein:

[0455] The first information and the second information are separate information respectively associated with different TRPs.

[0456] [Supplement A-4]

[0457] A terminal as described in any one of Supplement A-1 to Supplement A-3, wherein:

[0458] The first information corresponds to a first cell, the second information corresponds to a second cell,

[0459] The control unit controls the CFRA process in the inter-cell multi-TRP.

[0460] (Note B)

[0461] The following inventions are added to one embodiment of the present disclosure.

[0462] [Supplementary Note B-1]

[0463] A terminal having:

[0464] a receiving unit that, when a first random access channel (RACH) procedure corresponding to a first transmission reception point (TRP) is set, receives a setting related to a second RACH procedure corresponding to a second TRP; and

[0465] The control unit determines, based on a specific condition, to maintain the first RACH process or to stop the first RACH process and start the second RACH process.

[0466] [Supplementary Note B-2]

[0467] A terminal as described in Appendix B-1, wherein:

[0468] The control unit determines whether to maintain the first RACH process or to stop the first RACH process and start the second RACH process based on the ID related to the specific TRP.

[0469] [Supplementary Note B-3]

[0470] A terminal as described in Supplement B-1 or Supplement B-2, wherein:

[0471] The control unit determines whether to maintain the first RACH process or to stop the first RACH process and start the second RACH process based on the TRP associated with the specific physical cell ID.

[0472] [Supplement B-4]

[0473] A terminal as described in any one of Supplement B-1 to Supplement B-3, wherein:

[0474] The control unit determines whether to maintain the first RACH process or to stop the first RACH process and start the second RACH process based on the TRP associated with a specific timing advance group.

[0475] (Note C)

[0476] The following inventions are added to one embodiment of the present disclosure.

[0477] [Supplement C-1]

[0478] A terminal having:

[0479] a transmitting unit, based on at least one of a synchronization state of each transmit-receive point (TRP) and establishment of time alignment of each TRP, transmitting an uplink (UL) time synchronization request related to the TRP using a specific UL signal; and

[0480] The control unit determines that multiple TRPs are synchronized after a specific period of time has passed after sending the UL signal.

[0481] [Supplement C-2]

[0482] A terminal as described in Supplement C-1, wherein:

[0483] The specific UL signal is a scheduling request,

[0484] The control unit determines resources for the scheduling request for each of the TRPs or each timing advance group.

[0485] [Supplement C-3]

[0486] A terminal as described in Supplement C-1 or Supplement C-2, wherein:

[0487] The specific UL signal is a Medium Access Control (MAC) control element,

[0488] The MAC control element includes at least one of: a TRP-related index of the asynchronous TRP, a cell index of the asynchronous TRP, and an index of a timing advance group of the asynchronous TRP.

[0489] [Supplement C-4]

[0490] A terminal as described in any one of Supplement C-1 to Supplement C-3, wherein:

[0491] The control unit also controls the reception of a timing advance command (TAC) contained in a random access response (RAR),

[0492] The control unit determines the TRP to which the TAC is applied based on at least one of: a control resource set or a Transmission Configuration Indication (TCI) status associated with a physical downlink control channel that schedules the TAC, a TCI status of a physical downlink shared channel that transmits the RAR, and a specific timing advance group.

[0493] (Note D)

[0494] The following inventions are added to one embodiment of the present disclosure.

[0495] [Supplementary Note D-1]

[0496] A terminal having:

[0497] a receiving unit that receives a setting of a multiple transmission reception point (TRP) between cells, receives first information about resources of a contention free random access (CFRA) corresponding to a first candidate cell, and second information about resources of a CFRA corresponding to a second candidate cell; and

[0498] A control unit controls the CFRA process in the first candidate cell based on the first information, and controls the CFRA process in the second candidate cell based on the second information.

[0499] [Additional Note D-2]

[0500] A terminal as described in Supplement D-1, wherein:

[0501] The first information and the second information are common information, or are separate information respectively associated with different candidate cells.

[0502] [Additional Note D-3]

[0503] A terminal as described in Supplement D-1 or Supplement D-2, wherein:

[0504] The receiving unit further receives a setting related to a second random access channel (RACH) procedure corresponding to the second TRP when a first RACH procedure corresponding to the first TRP is set,

[0505] The control unit also determines, based on a specific condition, to maintain the first RACH process, or to stop the first RACH process and start the second RACH process.

[0506] [Additional Note D-4]

[0507] A terminal as described in any one of Supplement D-1 to Supplement D-3, wherein:

[0508] The control unit controls the sending of a UL time synchronization request related to the cell based on the synchronization state of the cell.

[0509] (Wireless Communication System)

[0510] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0511] Fig.14 1 is a diagram showing an example of a schematic structure of a wireless communication system according to an embodiment. The wireless communication system 1 (may also be simply referred to as the system 1) may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5GNR), or the like.

[0512] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0513] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0514] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0515] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0516] 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).

[0517] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0518] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0519] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0520] The base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0521] The core network 30 may also include, for example, user plane functions (User Plane Function (UPF)), access and mobility management function (Access and Mobility management Function (AMF)), session management function (Session Management Function (SMF)), unified data management (Unified Data Management (UDM)), application function (Application Function (AF)), data network (Data Network (DN)), location management function (Location Management Function (LMF)), maintenance and operation management (Operation, Administration and Maintenance (OAM))) and other network functions (Network Functions (NF)). In addition, multiple functions can also be provided by one network node. In addition, communication with an external network (for example, the Internet) can also be carried out via the DN.

[0522] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0523] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0524] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0525] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. can also be used.

[0526] In addition, in the wireless communication system 1, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)) or a random access channel (Physical Random Access Channel (PRACH)) may be used.

[0527] The PDSCH transmits user data, high-layer control information, and system information blocks (SIB). The PUSCH also transmits user data, high-layer control information, and the like. In addition, the PBCH also transmits the master information block (MIB).

[0528] The PDCCH may also transmit lower layer control information. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0529] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0530] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0531] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be rewritten mutually.

[0532] Through PUCCH, uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted. Through PRACH, random access preambles for establishing a connection with a cell can also be transmitted.

[0533] In the present disclosure, downlink, uplink, etc. may be expressed without “link.” In addition, various channels may be expressed without “Physical” at the beginning.

[0534] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted.

[0535] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0536] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may also be transmitted. In addition, DMRS may also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0537] (Base Station)

[0538] Fig.15 1 is a diagram showing an example of a structure of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0539] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0540] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0541] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0542] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are explained based on the common knowledge in the technical field involved in the present disclosure.

[0543] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0544] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0545] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0546] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0547] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 110, to generate a bit string to be sent.

[0548] The transmitting and receiving unit 120 (transmitting processing unit 1211) may also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output a baseband signal.

[0549] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0550] On the other hand, the transmission and reception unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmission and reception antenna 130 .

[0551] The transmitting and receiving unit 120 (receiving processing unit 1212) may also apply receiving processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0552] The transmitting and receiving unit 120 (the measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (RSRP)), received quality (e.g., reference signal received quality (RSRQ), signal to interference plus noise ratio (SINR), signal to noise ratio (SNR)), signal strength (e.g., received signal strength indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0553] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30 (for example, network nodes providing NF), other base stations 10, etc., and can also obtain and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0554] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0555] The transmitting and receiving unit 120 may also transmit first information related to resources of a non-contention random access (Contention Free Random Access (CFRA)) corresponding to a first transmitting and receiving point (TRP), and second information related to resources of a CFRA corresponding to a second TRP. The control unit 110 may also use the first information to indicate a CFRA process in the first TRP, and use the second information to indicate a CFRA process in the second TRP (first embodiment).

[0556] The transmitting and receiving unit 120 may also transmit settings related to a second RACH process corresponding to a second TRP when a first random access channel (RACH) process corresponding to a first transmitting and receiving point (TRP) is set. The control unit 110 may also use a specific condition to instruct to maintain the first RACH process, or to stop the first RACH process and start the second RACH process (second embodiment).

[0557] The transmitting and receiving unit 120 may also receive a UL time synchronization request related to the TRP using a specific uplink (UL) signal, wherein the specific uplink (UL) signal is sent based on at least one of a synchronization state of each transmitting and receiving point (TRP) and establishment of time alignment of each of the TRPs. The control unit 110 may also control to synchronize multiple TRPs after a specific period has passed after receiving the UL signal (third embodiment).

[0558] The transmitting and receiving unit 120 may also send the setting of multiple transmitting and receiving points (TRP) between cells, send first information related to resources of non-contention random access (Contention Free Random Access (CFRA)) corresponding to the first candidate cell, and second information related to resources of CFRA corresponding to the second candidate cell. The control unit 110 may also use the first information to indicate the CFRA process in the first candidate cell, and use the second information to indicate the CFRA process in the second candidate cell (sixth embodiment).

[0559] (User terminal)

[0560] Fig.16 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided in one or more pieces.

[0561] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0562] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0563] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0564] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0565] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0566] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0567] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0568] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0569] The sending and receiving unit 220 (sending processing unit 2211) may also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0570] The transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output a baseband signal.

[0571] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform; otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform the above-mentioned transmission processing without performing DFT processing.

[0572] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0573] On the other hand, the transmission and reception unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmission and reception antenna 230 .

[0574] The sending and receiving unit 220 (receiving processing unit 2212) can also apply receiving processing such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0575] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurement, CSI measurement, etc. based on the received signal. The measuring unit 223 may also measure the received power (e.g., RSRP), the received quality (e.g., RSRQ, SINR, SNR), the signal strength (e.g., RSSI), the propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0576] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0577] The transmitting and receiving unit 220 may also receive first information related to resources of a non-contention random access (Contention Free Random Access (CFRA)) corresponding to a first transmitting and receiving point (TRP), and second information related to resources of a CFRA corresponding to a second TRP. The control unit 210 may also control the CFRA process in the first TRP based on the first information, and control the CFRA process in the second TRP based on the second information (first embodiment).

[0578] The first information and the second information may be common information (first embodiment).

[0579] The first information and the second information may be separate information respectively associated with different TRPs (first embodiment).

[0580] The first information may also correspond to the first cell, and the second information may also correspond to the second cell. The control unit 210 may also control the CFRA process in the inter-cell multi-TRP (first embodiment).

[0581] The transmitting and receiving unit 220 may also receive settings related to a second RACH process corresponding to a second TRP when a first random access channel (RACH) process corresponding to a first transmitting and receiving point (TRP) is set. The control unit 210 may also determine to maintain the first RACH process, or to stop the first RACH process and start the second RACH process based on a specific condition (second embodiment).

[0582] The control unit 210 may also determine whether to maintain the first RACH process, or to stop the first RACH process and start the second RACH process based on an ID related to a specific TRP (second embodiment).

[0583] The control unit 210 may also determine whether to maintain the first RACH process, or to stop the first RACH process and start the second RACH process based on the TRP associated with a specific physical cell ID (second embodiment).

[0584] The control unit 210 may also determine whether to maintain the first RACH process, or to stop the first RACH process and start the second RACH process based on the TRP associated with a specific timing advance group (second embodiment).

[0585] The transmitting and receiving unit 220 may also use a specific uplink (UL) signal to send a UL time synchronization request related to each transmit and receive point (TRP) based on at least one of the synchronization status (status) of each TRP and the establishment of time alignment of each TRP. The control unit 210 may also determine that multiple TRPs are synchronized after a specific period of time has passed after sending the UL signal (third embodiment).

[0586] The specific UL signal is a scheduling request, and the control unit 210 may also determine the resource of the scheduling request for each TRP or each timing advance group (third embodiment).

[0587] The specific UL signal is a Medium Access Control (MAC) control element, and the MAC control element may also include at least one of the following: a TRP-related index of the asynchronous TRP, a cell index of the asynchronous TRP, and an index of the timing advance group of the asynchronous TRP (third embodiment).

[0588] The control unit 210 may also control the reception of a timing advance command (TAC) included in a random access response (RAR). The control unit 210 may also determine the TRP to which the TAC is applied based on at least one of the following: a control resource set or a Transmission Configuration Indication (TCI) state associated with a physical downlink control channel that schedules the TAC, a TCI state of a physical downlink shared channel that transmits the RAR, and a specific timing advance group (fourth embodiment).

[0589] The transmitting and receiving unit 220 may also receive the setting of multiple transmitting and receiving points (TRP) between cells, receive first information related to resources of non-contention random access (Contention Free Random Access (CFRA)) corresponding to the first candidate cell, and second information related to resources of CFRA corresponding to the second candidate cell. The control unit 210 may also control the CFRA process in the first candidate cell based on the first information, and control the CFRA process in the second candidate cell based on the second information (sixth embodiment).

[0590] The first information and the second information may be common information or individual information respectively associated with different candidate cells (sixth embodiment).

[0591] The transmitting and receiving unit 220 may also receive settings related to a second random access channel (RACH) process corresponding to the second TRP when the first RACH process corresponding to the first TRP is set. The control unit 210 may also determine whether to maintain the first RACH process, or stop the first RACH process and start the second RACH process based on specific conditions (seventh embodiment).

[0592] The control unit 210 may also control the transmission of a UL time synchronization request related to a cell based on the synchronization state of the cell (eighth embodiment).

[0593] (Hardware structure)

[0594] In addition, the block diagram used in the description of the above-mentioned embodiments shows blocks in units of functions. These function blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each function block is not particularly limited. That is, each function block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly connected (for example, by wire, wireless, etc.) and implemented by these multiple devices. The function block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0595] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method thereof is not particularly limited.

[0596] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.171001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0597] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, and unit can be interchanged. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0598] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by more than one chip.

[0599] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or by controlling at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0600] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the control unit 110 (210), the transmission and reception unit 120 (220), etc. described above may also be implemented by the processor 1001.

[0601] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the other functional blocks can also be implemented in the same way.

[0602] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0603] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0604] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0605] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0606] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0607] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0608] (Variation)

[0609] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may be rewritten one another. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0610] A radio frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0611] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0612] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0613] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0614] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be replaced with each other.

[0615] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0616] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0617] TTI can also be a transmission time unit for a data packet (transport block), code block, code word, etc. that has been channel-coded, and can also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (for example, the number of symbols) to which a transport block, code block, code word, etc. is actually mapped can also be shorter than the TTI.

[0618] In addition, when a time slot or a mini time slot is called a TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) may also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling may also be controlled.

[0619] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0620] In addition, a long TTI (eg, normal TTI, subframe, etc.) may be rewritten as a TTI having a time length exceeding 1 ms, and a short TTI (eg, shortened TTI, etc.) may be rewritten as a TTI having a TTI length shorter than that of a long TTI and longer than 1 ms.

[0621] Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0622] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0623] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0624] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0625] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) can also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, common RBs can also be identified by the index of the RB based on the common reference point of the carrier. PRBs can also be defined in a BWP and numbered within the BWP.

[0626] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0627] At least one of the set BWPs may be activated, and the UE may not assume that a specific signal / channel is transmitted or received outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0628] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0629] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0630] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0631] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, code elements, chips, etc. mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0632] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0633] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or added. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0634] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0635] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0636] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0637] The determination may be made using a value represented by one bit (0 or 1), a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(eg, comparison with a specific value).

[0638] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software module, application, software application, software package, routine, sub-routine, object, executable files, execution thread, procedure, function, etc.

[0639] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when the software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technologies and wireless technologies is included in the definition of transmission medium.

[0640] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0641] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0642] In the present disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)")", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro cell, and pico cell.

[0643] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that performs communication services within the coverage area.

[0644] In the present disclosure, the fact that a base station sends information to a terminal may be mutually rewritten with the fact that the base station instructs the terminal to control / operate based on the information.

[0645] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0646] There are also instances where a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client or some other appropriate terminology.

[0647] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a moving object, a moving object body, etc.

[0648] The mobile body refers to a movable object, and the moving speed is arbitrary, including the case where the mobile body is stopped. The mobile body includes, for example, vehicles, transport vehicles, cars, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, carts, rickshaws, ships (ships and other watercraft), airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, hot air balloons, and objects carried on them, but is not limited to these. In addition, the mobile body can also be a mobile body that drives autonomously based on operating instructions.

[0649] The mobile object may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile object that moves in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0650] Fig.18 1 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0651] The driving unit 41 is composed of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is composed of at least a steering wheel (also called a handle), and steers at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0652] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an Electronic Control Unit (ECU).

[0653] As signals from various sensors 50-58, there are the following signals, etc.: a current signal from a current sensor 50 for sensing the current of a motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by a speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of an accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of a brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of a shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0654] The information service unit 59 is composed of various devices such as a navigation system, an audio system, a speaker, a display, a television, and a radio for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 provides various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40 using information acquired from an external device via the communication module 60 or the like.

[0655] The information service unit 59 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0656] The driving assistance system unit 64 is composed of various devices for providing functions for preventing accidents before they happen or reducing the driver's driving burden, such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning detector (for example, Global Navigation Satellite System (GNSS)), map information (for example, High Definition (HD) map, Autonomous Vehicle (AV) map, etc.), gyroscope system (for example, inertial measurement unit (Inertial Measurement Unit (IMU)), inertial navigation unit (Inertial Navigation System (INS)), etc.), artificial intelligence (AI) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 to realize the driving assistance function or the automatic driving function.

[0657] The communication module 60 can communicate with the microprocessor 61 and the structural elements of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40 via the communication port 63.

[0658] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device that can communicate with an external device. For example, various information is sent and received with the external device via wireless communication. The communication module 60 can be inside or outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it can also function as at least one of the base station 10 and user terminal 20).

[0659] The communication module 60 may also transmit at least one of the following to an external device via wireless communication: a signal from the various sensors 50-58 input to the electronic control unit 49, information obtained based on the signal, and information based on input from the outside (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted by the communication module 60 may also include information based on the above input.

[0660] The communication module 60 receives various information (traffic information, signal information, vehicle information, etc.) transmitted from an external device, and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 may also be referred to as an output unit for outputting information (for example, outputting information to a display, a speaker, etc. based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0661] In addition, the communication module 60 stores various information received from the external device in the memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the various sensors 50-58, etc., which are provided in the vehicle 40.

[0662] In addition, the base station in the present disclosure may also be rewritten as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be rewritten as terms corresponding to inter-terminal communication (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0663] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0664] In the present disclosure, operations that are assumed to be performed by a base station may also be performed by its upper node depending on the situation. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal may obviously be performed by a base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0665] The various methods / implementations described in this disclosure may be used alone or in combination, and may be used in a switched manner as the method is executed. In addition, as long as there is no contradiction, the processing procedures, timings, flow charts, etc. of the various methods / implementations described in this disclosure may also be exchanged in order. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0666] The various modes / implementations described in the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems enhanced, modified, generated, or specified based on them. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0667] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0668] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0669] The term "determining" used in this disclosure may include a variety of operations. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are regarded as performing "determining".

[0670] In addition, “judgment (decision)” may also refer to situations where receiving (e.g., receiving information), transmitting (e.g., sending information), input (input), output (output), accessing (e.g., accessing data in a memory), etc. are regarded as making a “judgment (decision)”.

[0671] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as "judgment (decision)". That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as "judgment (decision)".

[0672] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0673] The “maximum transmit power” described in the present disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0674] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be rewritten as "access".

[0675] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-inclusive examples, being "connected" or "combined" to each other using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc.

[0676] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0677] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0678] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0679] In the present disclosure, “below”, “less than”, “above”, “more than”, “equal to”, etc. may be rephrased with each other. Furthermore, in the present disclosure, terms meaning “good”, “bad”, “big”, “small”, “high”, “low”, “early”, “late”, “wide”, “narrow”, etc. are not limited to the original comparative and superlative forms, but may be rephrased with each other. Furthermore, in the present disclosure, terms meaning “good”, “bad”, “big”, “small”, “high”, “low”, “early”, “late”, “wide”, “narrow”, etc. may be rephrased with each other as expressions with “ith” (i is an arbitrary integer), not limited to the original comparative and superlative forms (for example, “highest” may be rephrased with “i-th highest”).

[0680] In the present disclosure, “of,” “for,” “regarding,” “related to,” “associated with,” etc. may also be replaced by each other.

[0681] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A receiving unit, when a first random access channel (RACH) process corresponding to a first transmission reception point (TRP) is set, receives settings related to a second RACH process corresponding to a second TRP; and The control unit determines, based on a specific condition, to maintain the first RACH process or to stop the first RACH process and start the second RACH process.

2. The terminal according to claim 1, wherein: The control unit determines whether to maintain the first RACH process or to stop the first RACH process and start the second RACH process based on the ID related to the specific TRP.

3. The terminal according to claim 1, wherein: The control unit determines whether to maintain the first RACH process or to stop the first RACH process and start the second RACH process based on the TRP associated with the specific physical cell ID.

4. The terminal according to claim 1, wherein: The control unit determines whether to maintain the first RACH process or to stop the first RACH process and start the second RACH process based on the TRP associated with a specific timing advance group.

5. A wireless communication method of a terminal, comprising: When a first random access channel (RACH) process corresponding to a first transmission reception point (TRP) is set, a step of receiving a setting related to a second RACH process corresponding to a second TRP; and Based on a specific condition, determine whether to maintain the first RACH process or to stop the first RACH process and start the second RACH process.

6. A base station, comprising: a transmitting unit, when a first random access channel (RACH) process corresponding to a first transmission reception point (TRP) is set, transmitting a setting related to a second RACH process corresponding to a second TRP; and The control unit uses a specific condition to instruct to maintain the first RACH process, or to stop the first RACH process and start the second RACH process.

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