Terminal, radio communication method, and base station

Abstract

To appropriately perform cell switching using CLTM.SOLUTION: A terminal according to an aspect of the present disclosure has: a transmission section that transmits a first UL message for a target cell; and a control section that controls conditional L1L2-triggered mobility (CLTM) on the basis of CLTM cell switching delay. The CLTM cell switching delay is the time from the completion of the last transmission time interval (TTI) when a CLTM execution condition is satisfied for candidate beams until transmission of the first UL message.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) has been specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).

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

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] In future wireless communication systems (e.g., NR), the use of L1L2-triggered mobility (LTM) is being considered when a terminal (user terminal, User Equipment (UE)) moves between cells. Applying LTM can shorten the interruption time of cell switching.

[0006] In addition, support / introduction of conditional LTM (CLTM), in which the terminal triggers LTM when certain conditions are met, is being considered. However, there has been insufficient consideration on how to control cell switching using CLTM.

[0007] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately perform cell switching using CLTM. [Means for solving the problem]

[0008] A terminal according to one embodiment of the present disclosure includes a transmitting unit that transmits a first UL message to a target cell, and a control unit that controls the conditional L1L2-triggered mobility (CLTM) based on a CLTM cell switching delay, the CLTM cell switching delay being the time from the end of the last transmission time interval (TTI) when a CLTM execution condition is satisfied for a candidate beam to the transmission of the first UL message. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, a cell switch using CLTM can be appropriately performed. [Brief explanation of the drawings]

[0010] [Figure 1]FIG. 1 is a diagram showing an example of LTM considered in Rel. 18. [Figure 2] FIG. 2 is a diagram showing an example of a CLTM procedure of variation 2. [Figure 3] FIG. 3 is a diagram illustrating an example of an LTM cell switching delay and a delay before applying a TCI state according to the present disclosure. [Figure 4] FIG. 4 is a diagram illustrating an example of a CLTM cell switching delay and a delay until a TCI state is applied according to the present disclosure. [Figure 5] FIG. 5 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 8] FIG. 8 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. [Figure 9] FIG. 9 is a diagram illustrating an example of a vehicle according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (L1L2-triggered mobility (LTM) in Rel.18) FIG. 1 is a diagram illustrating an example of the LTM discussed in Rel. 18. Here, the steps of LTM are shown, including LTM preparation (e.g., LTM preparation), early synchronization (e.g., early sync), LTM execution (e.g., LTM execution), and LTM completion (e.g., LTM completion), but the LTM steps are not limited to these. Some steps (or operations included in steps) may be omitted, the order of operations included in some steps may be reversed with other operations included in other steps, or other steps (or other operations) may be added. In the present disclosure, early synchronization may be interpreted as synchronization.

[0012] DL / UL early synchronization is performed by the UE after RRC reconfiguration of the LTM candidate cell. The LTM decision at the source gNB is made based on L1 measurement reports from the UE.

[0013] The RACH to the target cell after receiving the cell switch command may or may not be performed depending on whether the UE has a valid Timing Advance (TA) of the target cell.

[0014] The UE completes the LTM cell switch procedure [by sending an RRCReconfigurationComplete message to the target cell].

[0015] For RACH-based LTM, the UE shall consider the LTM execution to be completed successfully once the random access procedure is completed successfully.

[0016] In the case of RACH-less LTM, the UE considers the LTM execution to be completed successfully when it determines that the network has successfully received the first UL data. The UE determines this by receiving a PDCCH addressed to the UE's C-RNTI in the target cell. This PDCCH schedules new transmissions following the first UL data.

[0017] (Conditional Handover (CHO)) CHO is applied to NR from Rel.16 onwards. CHO can be considered to include procedures equivalent to the LTM early synchronization, LTM execution and LTM completion procedures in the LTM procedures from Rel.18 onwards, but there are the following differences. Early synchronization is performed in LTM but not in CHO. · Early L1 measurement reporting is performed in LTM, but may or may not be performed in CHO. · In LTM, mobility is determined by NW (based on L1 beam reports), while in CHO, it is determined by the UE (based on L3 measurement results and CHO conditions). · In LTM, a cell switch command MAC CE is transmitted. · In CHO, after the UE receives the CHO configuration by RRC signaling, it starts to evaluate the CHO execution conditions of the candidate cells. · After mobility determination, RACH is required in CHO, but it may not be required in LTM.

[0018] (Conditional LTM (conditional L1L2-triggered mobility (CLTM))) <The first example of CLTM> The UE receives the setting of events / execution conditions for conditional L1L2-triggered mobility (CLTM) by RRC / MAC CE, etc., evaluates the events / execution conditions for CLTM (constantly / based on UE implementation), and when the events (conditions of the events) / execution conditions are satisfied, it transmits a first UL signal indicating a cell switch request (e.g., a UL cell switch command by MAC CE, etc.) to the current serving cell (the source cell / the base station (gNB) of the serving cell). If the UE receives an ACK of the first UL signal (e.g., MAC CE) from the gNB, it may perform a cell switch procedure (e.g., at least one of PRACH transmission to the target cell, PDCCH monitoring at the target cell, PUSCH transmission to the target cell, application of target RRC reconfiguration / TCI state ID / TA / BWP ID).

[0019] <<Event setting>> When CLTM and event-triggered beam reporting are configured simultaneously, the events (e.g., the above-mentioned report configuration (ReportConfigNR), the event type of conditional LTM, threshold, offset, hysteresis, Time To Trigger (TTT), etc.) and implementation conditions configured for CLTM and event-triggered beam reporting may be the same or different. The event-triggered beam reporting may be a beam reporting implemented based on the above-mentioned report configuration (ReportConfigNR).

[0020] <<Event evaluation timing>> The timing at which the UE evaluates the CLTM event may be defined as follows:

[0021] Option 1-A: When a specific DL (e.g., at least one of a PDCCH order, a TCI state activation / deactivation MAC CE, a semi-persistent (SP) CSI report activation / deactivation MAC CE, a cell switch command MAC CCE, or a new MAC CE / DCI) is received, or when a certain time has elapsed after receiving a DL.

[0022] Option 1-B: When a specific UE operation (e.g., DL / UL synchronization, RRC reconfiguration, TCI state activation, etc.) is completed, or a certain period of time has elapsed since completion. If the event / implementation conditions set for CLTM and event-triggered beam reporting are different, after the event for event-triggered beam reporting is met, or after the event-triggered beam reporting is sent. The event may be evaluated for the cell / RS that met the event for event-triggered beam reporting.

[0023] The timing of the CLTM event evaluation may be within a certain period of time after Option 1-A / 1-B.

[0024] <<Example of a UL signal sent after an event is met to indicate a cell switch request>> Variation 1: The first UL signal may be an RRC message, a UCI, or a PRACH. If the events configured for the CLTM and the event-triggered beam report are the same, the first UL signal may be used for the event-triggered beam report.

[0025] Variation 2: The UE may not transmit the first UL signal indicating a cell switch request. In this case, if an event (event condition) / execution condition is met, the UE may transmit a second UL signal (e.g., an event-triggered beam report) to the base station of the current serving cell to notify the possibility of a cell switch. In this case, the UE may perform the cell switch procedure before receiving an ACK for the second UL signal.

[0026] If Option 1-B is supported, after the event for the event-triggered beam report is met, the UE evaluates the event for CLTM (e.g., the same event (event condition) as the event-triggered beam report is met for a specified time (e.g., timer / TTT), a counter reaches a specified value before a timer expires, an event type / parameter different from the event-triggered beam report is met once or continuously within a certain time, etc.), and if the event for CLTM is met, the UE may perform a cell switch procedure.

[0027] If the event is not met, the UE may report to the NW via an UL signal that a cell switch will not be performed. If the gNB knows that the UE will not perform a cell switch before the timer expires, it can stop resource reservation for the target cell early to improve efficiency. This UL signal may be, for example, a one-bit or more signal using MAC CE / UCI, and may report which cell switch will not be performed. Alternatively, when evaluating an event on a cell-by-cell or RS-by-RS basis, this UL signal may include a cell ID or RS ID to report only the cell or RS to be stopped when evaluating events for multiple cells or RSs simultaneously.

[0028] If the UE receives any DL signal during the event evaluation of CLTM, the event evaluation may be aborted. When receiving the MAC CE for Rel.18 cell switch command, prioritize the MAC CE for Rel.18 cell switch command or the event evaluation of CLTM.

[0029] Variation 3: The UE may transmit a first UL signal indicating a cell switch request or a second UL signal of Variation 2 to the target cell.

[0030] Variation 4: The UE / gNB may perform a cell switch when an event is established, when a new MAC CE is transmitted, when a timer expires, or after a certain time has elapsed from each timing. Specific operations / DL / time / values of the UE may be set by upper-layer parameters, may be predetermined in the specification, or may be determined based on UE capabilities.

[0031] <<Example of CLTM procedure>> Figure 2 is a diagram showing an example of the CLTM procedure of Variation 2. In Figure 2, as operations of CLTM, steps of LTM preparation (e.g., LTM preparation), early sync (e.g., Early sync), LTM execution (e.g., LTM execution), and LTM completion (e.g., LTM completion) are shown, but the steps of LTM are not limited to this. Some steps (or operations included in the steps) may be omitted, the order of operations included in some steps and other operations included in other steps may be swapped, or other steps (or other operations) may be added.

[0032] 《LTM preparation》 In LTM preparation, a UE (e.g., UE in RRC_CONNECTED) connected to the serving cell by RRC transmits a measurement report. The measurement report may be an L3 measurement report. The base station (or source base station / serving cell) determines the execution of LTM based on the measurement report transmitted from the UE.

[0033] The base station (Source gNB) sends an RRC reconfiguration message to the UE containing the LTM candidate cell configuration for one or more candidate cells. The UE saves the LTM candidate cell configuration and sends an RRC reconfiguration complete message to the gNB. The base station (Source gNB) sends signaling containing the LTM candidate cell configuration to the base station (Candidate gNB) of the candidate cell.

[0034] 《Early sync》 The UE performs early synchronization (e.g., early sync) with the candidate cell. DL / UL early synchronization with the candidate cell may be performed by the UE after RRC configuration (e.g., RRC reconfiguration) of the LTM candidate cell.

[0035] LTM execution The UE evaluates whether the event is satisfied, and if so, transmits a second UL signal (e.g., UL cell switch command, event trigger report) to the base station (Source gNB) notifying the possibility of cell switch using the RS / TCI state of the candidate cell. Then, the base station (Source gNB) transmits signaling including the target cell ID and TCI state ID to the base station (Candidate gNB) of the candidate cell.

[0036] Since the UE can transmit an UL signal notifying the possibility of a cell switch before the cell switch decision, there is no need to transmit an UL signal when making the LTM cell switch decision. In other words, it is possible to avoid the gNB being unable to receive the UL signal when the UE is at the cell edge. The base station (Source gNB) can forward the above signaling, including the target cell ID and TCI state ID, to the base station (Candidate gNB) (Target gNB) before making the cell switch decision, allowing the target gNB to quickly secure resources for the UE. Note that in Rel.18 LTM, this signaling is forwarded when making the LTM cell switch decision.

[0037] The UE evaluates whether the second event is satisfied. If it is satisfied, the UE determines the LTM cell switch. The second event may be the same as or different from the first event. This is an event to avoid the pingpong problem. For example, when the UE satisfies the event for a predetermined time or when all events are satisfied within a predetermined time, the UE may determine the LTM cell switch and execute the cell switch procedure.

[0038] The UE applies the target cell setting. Then, the UE, the source gNB, and the candidate gNB (target gNB) execute the cell switch procedure.

[0039] The event for transmitting the first UL signal and the event for transmitting the second UL signal may be the same or different. The event for transmitting the first UL signal and the condition for executing the cell switch procedure after transmitting the second UL signal may be the same.

[0040] In the present disclosure, in order to determine whether the UE performs a cell switch and the target cell to be switched, the UE can execute the cell switch more quickly compared to the case where the base station determines.

[0041] <The Second Example of CLTM> CLTM may be defined as follows.

[0042] 1. The network sets either the L1 execution condition or the L3 execution condition for the CLTM candidate cell from the designated source cell.

[0043] 2. When the UE receives the CLTM setting including the execution condition of CLTM, the UE starts evaluating the execution condition.

[0044] 3. For conditional LTM based on L1 measurements (such as LTM3 / 5 events), the evaluation is performed for each candidate beam. For conditional LTM based on L3 measurements (such as condition A3 / condition A5 events), the evaluation is performed for each candidate cell (i.e., combining multiple beams of a candidate cell).

[0045] 4. The UE performs RACH-less CLTM (with triggered beam in case of L1-based CLTM) if the CLTM execution condition is met in the candidate beam (any beam in the candidate RS set) / cell and the UE has a valid TA for the associated candidate cell. Otherwise, the UE performs RACH-based CLTM.

[0046] 5. In the case of L1-based CLTM (assuming a single beam satisfies the CLTM execution conditions), beam selection for RACH-less LTM using configuration grant (CG) is based on whether the beam satisfies the CLTM execution conditions.

[0047] 6. For L1-based CLTM events, the execution of CLTM is triggered when at least one beam meets the CLTM event conditions. If multiple candidate beams meet the CLTM conditions, it is up to the UE implementation to select a beam to execute CLTM.

[0048] 7. RACH-less conditional LTM does not support dynamic grant (DG) based first UL transmission.

[0049] 8. For RACH-based conditional LTM procedures, Contention-Free Random Access (CFRA) is supported if the candidate cell configuration includes CFRA resources; otherwise, Contention-Based Random Access (CBRA) is used.

[0050] 9. For CLTM within a CU, it is up to the network implementation whether the execution condition is provided only to candidate cells that belong to the same CU as the current serving cell.

[0051] 10. Support CLTM fast failure recovery, which reuses the failure recovery mechanism of Rel.18 LTM (i.e., based on CBRA).

[0052] (LTM cell switching delay) FIG. 3 is a diagram illustrating an example of an LTM cell switching delay and a delay before applying a TCI state according to the present disclosure.

[0053] LTM cell switch delay D LTM is the delay from the end of the last Transmission Time Interval (TTI) containing the cell switch command MAC CE until the UE transmits the first UL message in the target cell (see FIG. 3).

[0054] LTM Cell Switch Command When the target cell in MAC CE and the joint UL / DL TCI state / separate UL / DL TCI state of the target are known, the LTM cell switch delay is defined as follows:

[0055] D LTM =T cmd +T LTM-interrupt

[0056] where T cmd =T HARQ +3ms. T HARQ T may refer to the timing (time) between the cell switch command and the acknowledgement. LTM-interrupt is the interruption time, which will be described later.

[0057] (interruption time) Interruption time T LTM-interruptis the time from the end of the last TTI including the cell switch command MAC CE until the UE transmits the first UL message in the target cell. cmd This is the time excluding

[0058] The interruption time is defined as follows:

[0059] T LTM-interrupt =T LTM-RRC-processing +T LTM-processing +T first-RS +T RS-proc +T LTM-IU (ms)

[0060] where T LTM-RRC-processing is the time taken to perform ASN.1 decoding and validity / compliance check for the RRC configuration of the LTM target cell indicated in the LTM cell switch command.

[0061] T LTM-processing is the time for the UE processing consisting of applying the target cell parameters and L1 / L2 change.

[0062] T first-RS is the time for fine time tracking and acquiring full timing information of the target cell.

[0063] T RS-proc is the time for SSB processing.

[0064] T LTM-IU is the uncertainty of the interruption during the LTM cell switch.

[0065] For RACH-based LTM cell switching, T LTM-IU may represent the uncertainty of the interruption in acquiring the first available PRACH opportunity in the new cell.

[0066] For example, T LTM-IU can be up to the sum of the SSB to PRACH associated / association period and 10 ms. The SSB to PRACH association period may be defined by the specification.

[0067] On the other hand, in the case of RACH-less LTM cell switching, T LTM-IU may refer to the uncertainty in sending the first UL transmission in the target cell.

[0068] (L1 / L2 triggered mobility procedure)

[0069] The UE may be provided by the LTM cell switch command MAC CE with a TCI state ID / UL TCI state ID indicating the candidate TCI state (CandidateTCI-State / CandidateTCI-UL-State) from the TCI state list (ldm-DL-OrJointTCI-StateToAddModList / ldm-UL-TCI-StateToAddModList) for PDSCH reception in the serving cell and applicable reception or transmission in the candidate cell from the number of candidate cells.

[0070] The UE may assume that the DM-RS antenna port for PDCCH / PDSCH reception is QCLed with the SS / PBCH block or TRS in TCI state, with respect to the QCL type A / D properties, if applicable.

[0071] The UE does not expect the QCL Type A properties to be indicated when the SS / PBCH block is configured as a source RS in the TCI state.

[0072] When instructed by the MAC CE, the UE applies the candidate TCI state (CandidateTCI-State / CandidateTCI-UL-State) within a predetermined time (not later than the predetermined time) after the last symbol of the PUCCH / PUSCH carrying the HARQ-ACK information of the PDSCH provided to the MAC CE (see Figure 3).

[0073] The above-mentioned predetermined time is T LTM-RRC-processing +T LTM-processing +T first-RS +T RS-proc +3 ms. The definitions of each time-related parameter are as described above. This predetermined time may be referred to as the delay / time until the TCI state is applied (TCI state application delay / time).

[0074] In case of RACH based LTM switching, after the random access procedure related to the PRACH transmission of the candidate cell is completed and before the new TCI state is applied for the candidate cell, the UE applies the candidate TCI state (CandidateTCI-State) for reception at the candidate cell and applies the spatial domain filter corresponding to the candidate TCI state (CandidateTCI-State / CandidateTCI-UL-State) for transmission at the candidate cell.

[0075] In case of RACH-less LTM switching, before the new TCI state is applied for the candidate cell, the UE applies the candidate TCI state (CandidateTCI-State) for reception in the candidate cell and applies the spatial domain filter corresponding to the candidate TCI state (CandidateTCI-State / CandidateTCI-UL-State) for transmission in the candidate cell.

[0076] (Further considerations for CLTM) Regarding the above-mentioned CLTM, the following points are being considered:

[0077] (1) From a given source cell, the NW sets either an L1 execution condition / L3 execution condition (which may also be referred to as a CLTM execution condition) for a candidate cell for CLTM.

[0078] (2) When the UE receives the CLTM configuration including the CLTM execution condition, the UE starts evaluating the execution condition.

[0079] (3) For CLTM based on L1 measurements (such as events LTM3 / 5), the UE performs the evaluation of the execution conditions for each candidate beam. For CLTM based on L3 measurements (such as events A3 / A5), the UE performs the evaluation of the execution conditions for each candidate cell (e.g., by consolidating multiple beams of a candidate cell).

[0080] (4) If the CLTM execution condition is met in a candidate beam (any beam in the candidate RS set) / cell, the UE will perform RACH-less CLTM [in the triggered beam in case of L1 measurement-based CLTM] if the associated candidate cell has a valid Timing Advance (TA). Otherwise (if the CLTM execution condition is not met or there is no valid TA), the UE will perform RACH-based CLTM.

[0081] (5) In the case of CLTM based on L1 measurements (assuming a single beam satisfies the CLTM execution conditions), beam selection for RACH-less LTM with configuration grant (CG) is performed based on whether the beam satisfies the CLTM execution conditions.

[0082] (6) For CLTM events based on L1 measurements, the execution of CLTM is triggered when at least one beam satisfies the conditions of the CLTM event. If multiple candidate beams satisfy the conditions of the CLTM event, it is up to the UE implementation to select a beam to execute CLTM.

[0083] (7) In RACH-less CLTM, dynamic grant (DG) based first UL transmission is not supported.

[0084] (8) For RACH-based CLTM procedures, CFRA may be supported only if CFRA resources are included in the candidate cell configuration; otherwise, CBRA is performed.

[0085] (9) In the case of intra-CU CLTM, it is up to the NW implementation to ensure that execution conditions are provided only to candidate cells that belong to the same CU as the current serving cell.

[0086] (10) CTLM fast recovery may be supported, leveraging existing (e.g., Rel. 18) LTM recovery mechanisms (e.g., based on CBRA).

[0087] (analysis)

[0088] In future wireless communication systems (e.g., NR), the use of L1L2-triggered mobility (LTM) is being considered when a terminal (user terminal, User Equipment (UE)) moves between cells. Applying LTM can shorten the interruption time of cell switching.

[0089] In addition, support / introduction of conditional LTM (CLTM), in which the terminal triggers LTM when certain conditions are met, is being considered.

[0090] For example, if the CLTM execution condition is satisfied, the UE can execute RACH-based / RACH-less CLTM.

[0091] As mentioned above, for RACH-less LTM, CG-based first UL transmission is supported. In this case, the UE selects a TCI state / beam with CG based on the beam that satisfies the CLTM execution condition.

[0092] Incidentally, the LTM cell switching delay / interruption time in the mobility procedure described above is a specification that assumes LTM using the cell switching command MAC CE.

[0093] On the other hand, since the cell switching command MAC CE is not used in CLTM, it is necessary to clarify the definitions related to the time domain, such as cell switching delay, for CLTM.

[0094] If these are not clear, there is a risk that cell switching using CTLM will not be properly supported.

[0095] Therefore, the present inventors came up with the idea of ​​a method for appropriately performing cell switching using CLTM.

[0096] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0097] (Various reading changes) In this disclosure, words enclosed in "()" in a sentence may indicate an explanation of the immediately preceding wording (for example, an explanation of spelling), a paraphrase, a specific example, a supplementary explanation, etc. Also, in this disclosure, words enclosed in "[ ]" in a sentence may be interpreted including the meaning of the entire sentence, or may be interpreted excluding the meaning of the entire sentence (ignoring the meaning of the entire sentence). Note that "()" and "[ ]" may also be used for purposes / meanings other than those mentioned above.

[0098] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0099] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be interchangeable. In the present disclosure, terms such as support, control, controllable, operate, and operate may be interchangeable.

[0100] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0101] 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, other messages (e.g., messages from the core network such as positioning protocol (e.g., NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP)) messages), or a combination thereof.

[0102] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0103] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0104] In the present disclosure, the terms "event," "event condition," "implementation condition," "condition," and "CLTM implementation condition" may be interchangeable. The terms "condition" in the present disclosure may refer to conditions for a cell switch. The terms "candidate cell" and "target cell" may be interchangeable. The terms "cell switch" in the present disclosure may refer to a switch of a serving cell (a switch to a target cell).

[0105] In the present disclosure, cell, base station, gNB, CU (gNB-CU), and DU (gNB-DU) may be interchangeable. A target cell may be a cell having a candidate cell ID indicated by a MAC CE to indicate TA of a candidate cell. A candidate cell and a target cell (a cell configured / indicated / selected as a target cell among candidate cells) may be interchangeable. A target cell may refer to a serving cell after a cell switch. Conditional LTM, CLTM, and event-triggered reporting may be interchangeable.

[0106] The CLTM of the present disclosure may be applied in at least one of intra-CU, inter-CU, intra-DU, and inter-DU.

[0107] (Wireless communication method) The UE may apply the present disclosure (the various regulations described above and the following embodiments) to execute / control the CLTM and related operations. The NW / BS / gNB may provide / transmit settings / instructions, etc. for the UE to achieve such control to the UE. Further, the NW / BS / gNB may execute various controls necessary to receive requests / reports, etc. from the UE.

[0108] In the present disclosure, each embodiment / each option may be applied alone or in combination.

[0109] In the present disclosure, CTLM is exemplified, but not limited thereto. The present disclosure is also applicable to other mobility use cases (e.g., LTM).

[0110] In the present disclosure, the CLTM execution conditions, execution conditions, and conditions may be read interchangeably with each other.

[0111] In the present disclosure, delay and time may be read interchangeably with each other.

[0112] According to the present disclosure, the regulations related to CTLM are clarified. The UE can appropriately control the CLTM based on the regulations. As a result, communication with lower latency can be realized, and the communication quality / throughput can be improved.

[0113] <The first embodiment> The first embodiment relates to the time-domain regulations regarding the execution of CLTM. FIG. 4 is a diagram showing an example of the CLTM cell switching delay and the delay until the TCI state is applied in the present disclosure.

[0114] <<CLTM cell switching delay>> In CTLM, the CLTM cell switch delay D LTM may mean the delay from the end of the last TTI when the CLTM execution condition is met for [one] candidate beam (or when the UE decides / starts to execute CLTM after the CLTM execution condition is met) until the UE transmits the first UL message in the target cell (see Figure 4).

[0115] That is, D LTM The start timing may be the end timing of the last TTI when the CLTM execution condition is satisfied for a candidate beam, or the end timing of the last TTI when the UE decides / starts to execute CLTM after the CLTM execution condition is satisfied.

[0116] Also, D LTM The end timing of may be the timing when the UE transmits the first UL message in the target cell.

[0117] Also, if DG-based CLTM is supported, D LTM The start timing may be the timing when the UCI / UL MAC CE is transmitted or the timing when an ACK for the PUSCH carrying the MAC CE is received.

[0118] The above-mentioned D LTM The detailed timing of may follow at least one of the following options:

[0119] (Opt1) A predetermined time after the end of the TTT (Time to Trigger) for a candidate beam / target cell. The predetermined time may be predefined by a specification, set / indicated by higher layer / physical layer signaling, or determined according to UE capabilities.

[0120] (Opt2) The timing at which a particular timer (e.g., T304 / CG retransmission timer) is started.

[0121] <<Delay until Applying TCI State (TCI State Application Delay)>> The UE may apply a candidate TCI state (CandidateTCI-State / CandidateTCI-UL-State) activated by a specific MAC CE (and / or selected by the UE after the conditions are satisfied) at a specific timing.

[0122] The specific MAC CE may be a MAC CE for activating / deactivating the TCI state of a candidate cell.

[0123] The specific timing may be T after the last TTI when the CLTM execution condition is satisfied for [one] candidate beam (or when the UE determines / starts to execute CLTM after the CLTM execution condition is satisfied). C-LTM within (T C-LTM not later than the timing).

[0124] T C-LTM may be referred to as the delay / time until applying the TCI state (TCI state application delay / time).

[0125] The above-mentioned specific MAC CE may be transmitted (received) or may not be transmitted (received).

[0126] The above-mentioned T C-LTM may be the same or different depending on whether the TCI state is activated or not. That is, the value of T C-LTM may be the same or different when the TCI state is activated and when it is not activated (deactivated).

[0127] <<D LTM and T C-LTM >> D LTM / T C-LTM For the detailed values of, T cmd =T HARQThe existing parameters for LTM may be applied, except that +3ms is not considered (is not required). cmd As described above, is a parameter associated with the cell switching command and is not required in CLTM.

[0128] That is, D LTM =T LTM-interrupt It may be expressed as T LTM-interrupt may mean the interruption time in CLTM. In other words, CLTM cell switching delay may be equal to the interruption time.

[0129] T LTM-interrupt The relevant parameters that make up the LTM-RRC-processing , T LTM-processing , T first-RS , T RS-proc , T LTM-IU ) may be used.

[0130] Specifically, the definitions of certain parameters may be expanded / updated (translated) for CLTM as follows:

[0131] (Example 1) T LTM-RRC-processing is the time taken to perform ASN.1 decoding and validity / compliance check for the RRC configuration of the LTM target cell indicated in the LTM cell switch command.

[0132] (Example 2) T CLTM-RRC-processing is the time taken to perform ASN.1 decoding and validity / compliance check on the RRC configuration of the CLTM target cell selected by the UE for CLTM after the CLTM execution conditions are met.

[0133] (Example 3) T LTM-RRC-processingis the time taken to perform ASN.1 decoding and validity / compliance checks on the RRC settings of the LTM target cell indicated in the LTM cell switch command, or the time taken to perform ASN.1 decoding and validity / compliance checks on the RRC settings of the CLTM target cell selected by the UE for CLTM after the CLTM execution conditions are met.

[0134] Based on these, D LTM and T C-LTM may be defined / expressed as follows:

[0135] D LTM =T LTM-RRC-processing (or T CLTM-RRC-processing )+T LTM-processing +T first-RS +T RS-proc +T LTM-IU (ms)

[0136] T C-LTM =T LTM-RRC-processing (or T CLTM-RRC-processing )+T LTM-processing +T first-RS +T RS-proc +3ms

[0137] In this way, D LTM and T C-LT So, "T LTM-IU The only difference is the part " and "3ms". LTM-IU = 3 ms, then D LTM and T C-LTM may have the same value, and T LTM-IU If ≠ 3 ms, then D LTM and T C-LTM may be different values.

[0138] In other words, the CLTM cell switching delay and the TCI state application delay may be the same value or different values.

[0139] Also, as shown in FIG. 4, the start timing of the CLTM cell switching delay and the start timing of the TCI state application delay may be the same. The end timing of the CLTM cell switching delay and the end timing of the TCI state application delay may be the same or different.

[0140] According to this embodiment, the time domain regulation related to the execution of CLTM becomes clear. The UE can appropriately control CLTM based on this regulation.

[0141] <Supplementary> <<Notification of Information to UE>> The notification of any information from the [network (Network (NW)) (e.g., base station (Base Station (BS)))] to the UE in the above embodiment (in other words, the reception of any information from the BS by the UE) may be performed using physical layer signaling (e.g., DCI), upper layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0142] 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 defined in the existing standard in the MAC sub-header.

[0143] When the above notification is performed by DCI, the above notification may be performed by a specific field of the DCI, a radio network temporary identifier (Radio Network Temporary Identifier (RNTI)) used for scrambling the cyclic redundancy check (Cyclic Redundancy Check (CRC)) bits assigned to the DCI, the format of the DCI, etc.

[0144] In addition, the notification of any information to the UE in the above-described embodiment may be performed periodically, semi-persistently (triggered by an instruction from the UE or gNB), or aperiodically (triggered by an instruction from the UE or gNB).

[0145] In the above-described embodiment, the UE may receive information from the NW as at least one of the following QCL rules. · QCL type A. · QCL type B. · QCL type C. · QCL type D.

[0146] In the above-described embodiment, the QCL source RS for each QCL type may be at least one of the following several RSs. · SSB. · CSI-RS with / without repetition. · TRS. · DMRS of PDCCH / PDSCH.

[0147] In the above-described embodiment, the information from the NW may be set / instructed by the following methods. · Common to multiple UEs or UE-specific. · Cell-specific or common to multiple cells. · Per UE / CC / BWP / band / cell / cell group (CG).

[0148] <<Notification of Information from UE>> The notification of any information from the UE to the NW (in other words, the transmission / reporting of any information from the UE to the BS) in the above-described embodiment may be performed using physical layer signaling (e.g., UCI), upper layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0149] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID in the MAC subheader that is not defined in existing standards.

[0150] If the notification is performed by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0151] In addition, notification of any information from the UE in the above-mentioned embodiments may be performed periodically, semi-persistently (triggered by an instruction from the UE or gNB), or aperiodically (triggered by an instruction from the UE or gNB).

[0152] <<Application of each embodiment>> In a UE / BS, the specific process / operation / control / assumption / information(s) of at least one of the above-described embodiments may be applied (used) when one or more of the following conditions are met: Upper layer parameters indicating the above specific processing / operation / control / assumment / information are set. The specific processing / action / control / assumption / information is determined based on relevant upper layer parameters; The above specific processes / actions / controls / assumes / information are specified / activated / triggered by MAC CE / DCI / UCI / resources / channels / RS, Reporting or supporting specific UE capabilities indicating (or relating to) the above specific processes / actions / controls / assumptions / information; · The application of the above specific processing / action / control / assumption / information is judged based on specific conditions.

[0153] The specific UE capabilities may indicate at least one of the following: Supporting the above specific processes / actions / controls / assumptions / information; · Support CLTM. · Related parameters related to CLTM cell switching delay / TCI state application delay.

[0154] In the present disclosure, the terms "supporting" and "whether to support" may be read interchangeably.

[0155] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., one or a combination of a cell, band, band combination, BWP, component carrier, etc.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0156] Furthermore, the specific UE capability may be a capability that is applied across all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (for example, Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0157] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0158] (Addendum) The following inventions are added regarding one embodiment of the present disclosure: [Appendix 1] a transmitter for transmitting a first UL message to a target cell; a control unit for controlling the conditional L1L2-triggered mobility (CLTM) based on a cell switching delay; A terminal in which the CLTM cell switching delay is the time from the end of the last transmission time interval (TTI) when the CLTM execution condition is satisfied for the candidate beam to the transmission of the first UL message. [Appendix 2] A terminal as described in Appendix 1, wherein the control unit applies an activated candidate transmission setting indication (TCI) state within a predetermined time after the end of the last TTI when the CLTM execution condition for the candidate beam is satisfied. [Appendix 3] The terminal according to claim 1 or 2, wherein the cell switching delay is an interruption time in CLTM. [Appendix 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the end timing of the CLTM cell switching delay and the end timing of the transmission configuration indication (TCI) state application delay are the same or different.

[0159] (wireless communication system) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0160] 5 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0161] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0162] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0163] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0164] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The location, number, shape, size, etc. of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0165] The wireless communication system 1 may utilize Multi Input Multi Output (MIMO). For example, one cell may be formed by one antenna / base station 10, or may be formed by multiple antennas / base stations 10. One [virtual] cell (which may be called, for example, a super cell) may be composed of multiple [virtual] cells (which may be called, for example, sub-cells). A super cell may correspond to a cell whose physical range is fixed, and a sub-cell may correspond to a cell whose physical range varies semi-statically / dynamically. In this case, the wireless communication system 1 may be called a cell-free system.

[0166] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0167] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR2.

[0168] 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.

[0169] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 / Xn interface, etc.) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0170] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0171] The core network 30 may include network functions (NFs) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and an Operation, Administration and Maintenance (Management) (OAM). Note that a single network node may provide multiple functions. Furthermore, communication with an external network (e.g., the Internet) may be performed via the DN.

[0172] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0173] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio communication system 1. For example, 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), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0174] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0175] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0176] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0177] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0178] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0179] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0180] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0181] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0182] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0183] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0184] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted as DL-RS.

[0185] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as reference signals.

[0186] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0187] (base station) 6 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0188] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0189] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0190] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0191] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0192] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0193] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0194] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0195] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0196] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0197] The transceiver 120 (transmission processor 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0198] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0199] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0200] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0201] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0202] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes providing NFs), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0203] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0204] The base station 10 may be separated into three elements: a radio unit (RU), a distributed unit (DU), and a central unit (CU). For example, the RU may perform RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level functions of the physical layer (precoding, IFFT, FFT, etc.). The DU may perform higher-level functions of the physical layer (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may perform PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer functions.

[0205] In the present disclosure, the base station 10 may include a single device that implements all of the functions of the RU, DU, and CU, or may include multiple devices that each implement some of the functions of the RU, DU, and CU and are connected to each other. In the present disclosure, the base station 10 may be interchangeably read as RU / DU / CU.

[0206] The transceiver 120 may receive a first UL message for the target cell. The controller 110 may generate a configuration for the terminal to control the conditional L1L2-triggered mobility (CLTM) based on a CLTM cell switching delay. The CLTM cell switching delay may be the time from the end of the last transmission time interval (TTI) when a CLTM execution condition is satisfied for a candidate beam to the transmission of the first UL message.

[0207] (user terminal) 7 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0208] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0209] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0210] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.

[0211] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0212] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0213] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0214] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0215] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0216] The transceiver 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0217] The transceiver 220 (transmission processor 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0218] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0219] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0220] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0221] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0222] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0223] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0224] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0225] The control unit 210 may perform at least part of the processing of the control unit in the above appendix.

[0226] The transceiver unit 220 may perform at least part of the processing of the transmitter / receiver unit in the above appendix.

[0227] The CLTM cell switching delay may be the time from the end of the last transmission time interval (TTI) when the CLTM execution condition is satisfied for the candidate beam to the transmission of the first UL message.

[0228] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0229] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As mentioned above, the implementation method of each is not particularly limited.

[0230] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 8 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0231] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0232] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0233] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0234] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0235] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0236] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0237] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0238] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0239] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0240] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0241] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0242] Note that the devices included in the core network 30 (for example, network nodes that provide NFs) may also be realized by the above-described functional block / hardware configuration.

[0243] (Variation) Note that terms explained in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0244] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0245] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0246] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0247] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0248] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0249] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot 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. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0250] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0251] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0252] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0253] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0254] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0255] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0256] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0257] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0258] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0259] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0260] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0261] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0262] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0263] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0264] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0265] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0266] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0267] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0268] With respect to any information (e.g., variables, constants, parameters) described in the present disclosure, even if not specifically stated in the above embodiments, any first device (e.g., UE / base station) may notify any second device (e.g., base station / UE) of information indicating / identifying (or relating to) the value of the any information.

[0269] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0270] Note that the physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be called an RRC message, such as an RRC connection setup message or an RRC connection reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0271] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0272] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0273] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0274] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0275] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0276] 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," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0277] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. The spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0278] The group may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0279] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0280] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0281] Furthermore, in this disclosure, terms such as "QCL," "QCL assumptions," "QCL relationships," "QCL type information," "QCL properties," "specific QCL type (e.g., Type A, Type D) properties," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0282] In this disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In this disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0283] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and spatial relationship information (TCI state) may be interchangeable. "Spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and TCI may be interchangeable. The spatial relationship information and spatial relationship may be interchangeable.

[0284] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0285] A base station can accommodate one or more (e.g., 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 be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0286] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0287] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0288] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0289] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0290] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0291] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0292] 9 is a diagram showing an example of a vehicle according to an embodiment. 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, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM 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.

[0293] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0294] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (e.g., an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0295] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation 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 the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the 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.

[0296] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, 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 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0297] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0298] The driving assistance system unit 64 is configured with various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), Artificial Intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0299] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0300] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the above-mentioned base station 10 or user terminal 20. Furthermore, the communication module 60 may be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (or may function as at least one of the base station 10 and user terminal 20).

[0301] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0302] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0303] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0304] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as uplink channel and downlink channel may be read as sidelink channel.

[0305] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0306] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0307] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the specific order presented.

[0308] Each aspect / embodiment described in the present disclosure may be a technology other than 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 decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. It may also be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0309] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0310] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0311] The term "determining," as used in this disclosure, may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0312] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0313] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0314] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0315] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ...," "do ... (if the above "..." is a to-infinitive, a verb with "to")," etc. "does not expect ..." may be interchangeably read as "be not expected ...," "does not ... (if the above "..." is a to-infinitive, a verb with "to")," etc. Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (for example, if apparatus A is a UE, apparatus B may be a base station).

[0316] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0317] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0318] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0319] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0320] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0321] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0322] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with the prefix "i-th" (i is any integer) (for example, "highest" may be interchangeable as "i-th highest").

[0323] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0324] In the present disclosure, terms such as "when A, B," "if A, (then) B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at (the same time as) / on A," "B after A," "B since A," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions, such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be nearly zero (immediately after or immediately before). A time offset may be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after the time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0325] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0326] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a transmitter for transmitting a first UL message to a target cell; a controller for controlling conditional L1L2-triggered mobility (CLTM) based on a CLTM cell switching delay; A terminal in which the CLTM cell switching delay is the time from the end of the last transmission time interval (TTI) when the CLTM execution condition is satisfied for a candidate beam to the transmission of the first UL message.

2. The terminal of claim 1, wherein the control unit applies an activated candidate transmission setting indication (TCI) state within a predetermined time after the end of the last TTI when the CLTM execution condition for the candidate beam is satisfied.

3. The terminal of claim 1 , wherein the cell switching delay is an interruption time in CLTM.

4. The terminal of claim 1 , wherein an end timing of the CLTM cell switching delay and an end timing of a transmission configuration indication (TCI) state application delay are the same or different.

5. transmitting a first UL message for the target cell; and controlling conditional L1L2-triggered mobility (CLTM) based on a CLTM cell switching delay; A wireless communication method for a terminal, wherein the CLTM cell switching delay is the time from the end of the last transmission time interval (TTI) when the CLTM execution condition is satisfied for the candidate beam to the transmission of the first UL message.

6. a receiver for receiving a first UL message for a target cell; a control unit that generates a configuration for a terminal to control conditional L1L2-triggered mobility (CLTM) based on a CLTM cell switching delay; A base station, wherein the CLTM cell switching delay is the time from the end of the last transmission time interval (TTI) when the CLTM execution condition is satisfied for the candidate beam to the transmission of the first UL message.

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