Terminal, radio communication method, and base station

Abstract

To improve communication quality / throughput.SOLUTION: A terminal according to an aspect of the present disclosure has: a receiving section that receives a parameter related to an execution condition for conditional lower layer-triggered mobility (CLTM) for a serving cell and candidate cells; and a control section that controls a cell switching operation on the basis of the parameter related to the execution condition, and performs control so as not to release the parameter related to the execution condition after the completion of the cell switching operation.SELECTED DRAWING: Figure 9

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 (or Lower layer)-triggered mobility (LTM) defined in Rel. 18 is being considered when a terminal (user terminal, User Equipment (UE)) moves between cells. Applying LTM in Rel. 18 can shorten the interruption time of cell switching.

[0006] Conditional LTM (CLTM) is being considered for support / introduction in Release 19 and later. Subsequent CLTM is also being considered for support / introduction in Release 19 and later. However, there has been insufficient consideration given to how CLTM / subsequent CLTM should be supported.

[0007] If this consideration is insufficient, it may not be possible to achieve lower latency communications using LTM / CLTM, which could result in suppression of improvements in communication quality / throughput. stomach.

[0008] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can improve communication quality / throughput. [Means for solving the problem]

[0009] A terminal according to one embodiment of the present disclosure has a receiving unit that receives parameters related to execution conditions for conditional Lower layer-triggered mobility (CLTM) for a serving cell and each candidate cell, and a control unit that controls a cell switch operation based on the parameters related to the execution conditions and controls not to release the parameters related to the execution conditions after completion of the cell switch operation. [Effects of the Invention]

[0010] According to one aspect of the present disclosure, communication quality / throughput can be improved. [Brief explanation of the drawings]

[0011] [Figure 1] Fig. 1A is a diagram showing an example of UE movement in Rel. 17. Fig. 1B is a diagram showing an example of UE movement in Rel. 18. [Figure 2] FIG. 2 is a diagram showing an example of the procedure for Rel. 18 LTM (R18 LTM). [Figure 3] FIG. 3 is a diagram showing a first example of conditional LTM operation. [Figure 4] FIG. 4 is a diagram showing a second example of conditional LTM operation. [Figure 5] FIG. 5 is a diagram illustrating an example of the operation of a target cell in conditional LTM. [Figure 6] FIG. 6 is a diagram showing a third example of conditional LTM operation. [Figure 7] FIG. 7 is a diagram showing a fourth example of conditional LTM operation. [Figure 8] FIG. 8 is a diagram showing a fifth example of conditional LTM operation. [Figure 9] FIG. 9 is a diagram illustrating an example of a UE operation according to the first embodiment. [Figure 10] FIG. 10 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 11] FIG. 11 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 12] FIG. 12 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 13] FIG. 13 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of a vehicle according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] (L1 / L2 inter-cell mobility) The UE may perform UL transmission to one or more cells / TRPs. The following scenario 1 or scenario 2 may be considered as a procedure in this case. In the present disclosure, the serving cell may be replaced with the TRP in the serving cell. Layer 1 / layer 2 (L1 / L2) and DCI / Medium Access Control Control Element (MAC CE) may be replaced with each other. In the present disclosure, a physical cell identity (PCI) different from the physical cell identity (PCI) of the current serving cell may be simply referred to as a "different PCI." A non-serving cell, a cell having a different PCI, and an additional cell may be replaced with each other.

[0013] <Scenario 1> Scenario 1 corresponds to, for example, multi-TRP inter-cell mobility, but may also be a scenario that does not correspond to multi-TRP inter-cell mobility.

[0014] (1) The UE receives from the serving cell the configuration necessary to use radio resources for data transmission and reception, including SSB configuration for beam measurement of a TRP corresponding to a PCI different from that of the serving cell, and resources of the different PCI. (2) The UE performs beam measurement of the TRPs corresponding to different PCIs and reports the beam measurement results to the serving cell. (3) Based on the above report, the Transmission Configuration Indication (TCI) states associated with the TRPs corresponding to different PCIs are activated by L1 / L2 signaling from the serving cell. (4) The UE transmits and receives using UE-dedicated channels on TRPs corresponding to different PCIs. (5) The UE must always cover the serving cell, including in the case of multiple TRPs. As in conventional systems, the UE must use common channels from the serving cell, such as the Broadcast Control Channel (BCCH) and the Paging Channel (PCH).

[0015] In Scenario 1, when the UE transmits and receives signals to and from an additional cell / TRP (a TRP corresponding to the PCI of the additional cell), the serving cell (the serving cell assumed by the UE) is not changed. The UE is configured with higher layer parameters related to the PCI of non-serving cells from the serving cell. Scenario 1 may be applied, for example, in Rel. 17.

[0016] Figure 1A shows an example of UE movement in Rel. 17. Assume that the UE moves from a cell (serving cell) with PCI #1 to a cell (additional cell) with PCI #3 (which overlaps with the serving cell). In this case, Rel. 17 does not support switching of the serving cell via L1 / L2.

[0017] An additional cell is a cell with an additional PCI that is different from the PCI of the serving cell. The UE can receive / transmit UE-dedicated channels from the additional cell. The UE needs to be within the coverage of the serving cell to receive UE common channels (e.g., system information / paging / short messages). When the UE moves out of the coverage of the serving cell, a cell change is required, for example, by handover (also known as L3 mobility).

[0018] <Scenario 2> In scenario 2, L1 / L2 inter-cell mobility is applied. With L1 / L2 inter-cell mobility, the serving cell can be changed using functions such as beam control without RRC reconfiguration. In other words, transmission and reception with an additional cell is possible without handover. Since handover requires RRC reconnection and creates a period when data communication is unavailable, by applying L1 / L2 inter-cell mobility that does not require handover, data communication can be continued even when the serving cell is changed. Scenario 2 may be applied in Rel. 18, for example. In scenario 2, for example, the following procedure is performed.

[0019] (1) The UE receives from the serving cell the SSB configuration of a cell (additional cell) with a different PCI for beam measurement / serving cell change. (2) The UE performs beam measurements of cells using different PCIs and reports the measurement results to the serving cell. (3) The UE may receive a configuration of a cell with a different PCI (serving cell configuration) through higher layer signaling (e.g., RRC). That is, a pre-configuration regarding a serving cell change may be performed. This configuration may be performed together with the configuration in (1) or separately. (4) Based on the above report, the TCI states of cells with different PCIs may be activated by L1 / L2 signaling according to the change of serving cell. The activation of the TCI states and the change of serving cell may be performed separately. (5) The UE changes the serving cell (assumed serving cell) and starts receiving / transmitting using the pre-configured UE-specific channel and TCI state.

[0020] That is, in Scenario 2, the serving cell (the assumed serving cell in the UE) is updated by L1 / L2 signaling. Scenario 2 may be applied in Rel. 18.

[0021] FIG. 1B is a diagram showing an example of UE movement in Rel. 18. In Rel. 18, the serving cell is switched by L1 / L2 (e.g., DCI / MAC CE). The UE can receive / send UE-dedicated channels / common channels between the UE and the new serving cell (or target serving cell). The UE may go out of the coverage of the current serving cell (e.g., Current serving cell).

[0022] (L1L2-triggered mobility (LTM) in Rel. 18) FIG. 2 is a diagram showing an example of LTM being considered in Rel. 18. Here, as the operations of LTM, 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. Note that in the present disclosure, early sync may be read as sync.

[0023] <LTM preparation> 1: The UE sends a measurement report message to the gNB. The gNB determines the LTM settings and starts preparing one or more candidate cells.

[0024] 2: The gNB sends an RRC reconfiguration message including the LTM candidate cell settings of one or more candidate cells to the UE.

[0025] 3: The UE saves its LTM candidate cell settings and sends an RRC reconfiguration completion message to the gNB.

[0026] <Early sync> 4a: Before receiving the cell switch command, the UE performs DL synchronization with one or more candidate cells. DL synchronization for candidate cells before the cell switch command may be supported based at least on SSB.

[0027] 4b: When requested by the network, the UE performs early TA acquisition with one or more candidate cells before receiving the cell switch command. This is triggered via CFRA according to the PDCCH order from the source cell. Next, the UE transmits a preamble to the indicated candidate cell. To minimize data interruption of the source cell by CFRA to the candidate cell, the UE does not receive the RAR for the purpose of TA value acquisition. The TA value of the candidate cell is indicated in the cell switch command. The UE does not maintain a TA timer for the candidate cell and guarantees the validity of TA based on the network implementation.

[0028] <LTM execution> 5: The UE performs L1 measurements set for the candidate cell and transmits an L1 measurement report to the gNB. The L1 measurements are performed as long as the RRC reconfiguration in step 2 is applied.

[0029] 6: The gNB decides to execute a cell switch to the target cell and transmits a MAC CE (cell switch command) to trigger the cell switch. The MAC CE includes the candidate setting of the index of the target cell. The UE switches to the target cell and applies the setting indicated by the candidate setting index.

[0030] 7: If the UE does not have a valid TA for the target cell, it performs a random access procedure for the target cell.

[0031] <LTM completion> 8: The UE completes the LTM cell switch procedure by sending an RRC reconfiguration complete message. The UE performs the RA procedure in step 7, and considers the LTM execution to be completed successfully if the random access procedure is successfully completed. In RACH-less LTM, the UE considers the LTM execution to be completed successfully if the network determines that the first UL data has been successfully received. The UE determines the successful reception of the first UL data by receiving a PDCCH specifying the UE's C-RNTI in the target cell that schedules the next new transmission of the first UL data.

[0032] (Conditional Handover (CHO)) This section explains Conditional Handover (CHO) in Rel. 16 and later. CHO is applied to, for example, Non-Terrestrial Networks (NTN). NTN supports the following additional trigger conditions for a UE to perform CHO to a candidate cell: Radio Resource Management (RRM) measurement-based event A4. Time-based trigger conditions. Location-based trigger conditions.

[0033] A time-based or location-based trigger condition is always configured together with one of the measurement-based trigger conditions (CHO events A3 / A4 / A5 described below). How the UE evaluates the time-based or location-based trigger conditions together with the RRM measurement-based events is up to the UE implementation.

[0034] (Rel.18 LTM and Rel.16 CHO) While the above-mentioned LTM (e.g., Rel. 18 LTM) supports early sync / early L1 measurement report, CHO (e.g., Rel. 16 CHO) does not support early sync / early measurement report. In LTM, mobility decisions are made by the network (based on L1 beam reports), while in CHO, they are made by the UE (based on L3 measurement results and CHO conditions).

[0035] In LTM, a MAC CE for cell switch command is transmitted from the base station to the UE. In CHO, the UE starts evaluating the execution conditions of CHO for candidate cells after receiving the CHO configuration through RRC signaling. After deciding on mobility (or cell switch), CHO requires RACH, but LTM may not require RACH.

[0036] (conditional LTM) In the case where conditional LTM (eg, conditional LTM (CLTM)) is supported, an example of providing / signaling / evaluating execution conditions (eg, execution condition(s)) for candidate cells will be described.

[0037] Execution conditions may be set for each candidate cell by RRC signaling / MAC CE. The execution conditions (or may simply be called "conditions") may include at least one of an event, a reference signal type (RS type), a reference signal configuration (RS configuration), and a measurement quantity. The reference signal type (RS type) may indicate SSB / CSI-RS. The measurement quantity may indicate L1-RSRP / L3-RSRP / SINR / RSRQ.

[0038] The execution conditions may be set separately for each candidate cell (e.g., the setting of different conditions may be supported). Alternatively, the execution conditions may be set commonly for multiple candidate cells (e.g., a candidate cell group) or for all candidate cells. Alternatively, some of the execution conditions may be set commonly for each candidate cell, and the rest of the execution conditions may be set separately. Some of the execution conditions may be events, and the rest of the execution conditions may be condition values, etc. Of course, this is not limited to this.

[0039] The number of candidate cells for which the execution condition is provided may be predefined in a specification, may be configured in the UE by a network (e.g., a base station), or may be determined based on UE capabilities. For example, the number of cells for which the execution condition is provided may be the same as the configured candidate cells, or may be less than all the configured candidate cells.

[0040] The settings for the execution conditions (e.g., detailed settings) may be the same as the condition settings of the existing system. The condition settings of the existing system may be, for example, the condition settings supported by CHO supported in Rel. 16 (e.g., condition settings based on L3 measurement).

[0041] Alternatively, a new condition setting similar to that for an event-triggered L1 report may be applied to the execution condition setting. An example of a condition (or event) is shown below. Event A2: The serving cell measurement is worse than the threshold. Event A3: The measurement result of the neighboring cell (the measurement result plus an offset) is better than the measurement result of the SpCell (the measurement result plus an offset). Event A4: The measurement result of the neighboring cell (the measurement result plus an offset) is better than the threshold. Event A5: The measurement result of SpCell is worse than the first threshold, and the measurement result of the neighboring cell (a value obtained by adding an offset to the measurement result) is better than the second threshold. Event A6: The measurement result of the neighboring cell (a value obtained by adding an offset to the measurement result) is better than the measurement result of the serving cell (Secondary Cell (SCell)) (a value obtained by adding an offset to the measurement result). Event I1: The interference measurement is higher than the threshold. Event A4': The measurement result of one beam from the neighboring cell is better than the threshold. Event A4: The statistical value (e.g., average, sum, etc.) of the measurement results of multiple beams (e.g., the best X beams) is better than a threshold. X may be fixed or configurable by higher layer signaling, etc. Event A4': The L1-RSRP measurement result of one beam from a neighboring cell is better than the threshold. Event A4''): The L1-RSRP of each of the X beams from the neighboring cells is better than the threshold.

[0042] It should be noted that the applicable conditions / events are not limited to these, and a combination of the above events may be applied, or other events may be applied.

[0043] For the condition for each candidate cell (or for multiple / all candidate cells), the condition (or event) to be set may be determined based on at least one of options 1 and 2 below.

[0044] <Option 1> One condition may be set for each candidate cell (or for multiple / all candidate cells), and the condition may correspond to only one event, i.e., one condition having only one event may be set for each candidate cell (or for multiple / all candidate cells).

[0045] When a condition corresponding to each candidate cell (or an event corresponding to the condition) is satisfied, the UE / base station may control to perform an LTM procedure / action for the candidate cell.

[0046] <Option 2> Multiple conditions (e.g., up to X conditions) may be set for each candidate cell (or for multiple / all candidate cells). X may be, for example, 2 or 3, or may be 4 or more. X may be defined in a specification, may be set to the UE by the base station, or may be determined based on the UE capabilities.

[0047] When at least one of a plurality of conditions (or events corresponding to each condition) corresponding to each candidate cell is satisfied, the UE / base station may be controlled to perform an LTM procedure / action for the candidate cell.

[0048] When multiple (e.g., X) conditions are supported for each candidate cell, restrictions may be placed between the multiple conditions. The restrictions between the conditions may be, for example, RS configuration / RS type / event / measurement quantity. For example, the same RS configuration / RS type may be set between the multiple conditions, and different event / measurement quantities may be set between the multiple conditions.

[0049] When different conditions correspond to different candidate cells, restrictions may be imposed between the conditions, or restrictions may not be imposed between the conditions.

[0050] The supported conditions (eg, RS configuration / RS type / event / measurement quantity), the number of conditions to be set may be according to the UE capability.

[0051] Below, an example of the operation of the conditional LTM will be explained, but parts that are not particularly explained may be the same as the procedure of the Rel. 18 LTM (R18 LTM) shown in FIG.

[0052] <Conditional LTM operation example 1> FIG. 3 is a diagram showing a first example of conditional LTM operation. In FIG. 3, as the operation of conditional LTM, steps of LTM preparation (e.g., CLTM preparation), early sync (e.g., Early sync), LTM execution (e.g., CLTM execution), and LTM completion (e.g., CLTM 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.

[0053] <<LTM Preparation>> In LTM preparation, a UE (e.g., UE in RRC_CONNECTED) connected to a 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) performs LTM candidate preparation (e.g., LTM candidate preparation) based on the measurement report transmitted from the UE.

[0054] The base station performs LTM candidate setting (e.g., LTM candidate configuration) and setting of execution conditions (e.g., execution conditions) for candidate cells by RRC (e.g., RRC reconfiguration). Information regarding candidate cells may be set in the UE by LTM candidate setting. Execution conditions may be set for each candidate cell (or for each of a plurality / all candidate cells) by setting of execution conditions for candidate cells.

[0055] For setting of execution conditions for candidate cells, Option 1 / Option 2 may be applied.

[0056] <<Early Sync>> The UE performs early synchronization (e.g., Early sync) with candidate cells. The DL / UL early synchronization with candidate cells may be performed by the UE after the RRC configuration (e.g., RRC reconfiguration) of the LTM candidate cells.

[0057] <<LTM execution>> The UE measures (e.g., L1 measurements) the configured candidate cells and transmits a measurement report. The measurement report may be an L1 measurement report.

[0058] The base station (or source base station / serving cell) makes a Conditional LTM (CLTM) decision based on the measurement report transmitted from the UE. For example, the base station determines the Conditional LTM for one or more candidate target cells for which the execution conditions can be evaluated (or for which the UE needs to evaluate the execution conditions). One or more candidate target cells for which the execution conditions can be evaluated may be determined based on the measurement report transmitted from the UE.

[0059] The base station may transmit a predetermined MAC CE to the UE. The base station may use the predetermined MAC CE to instruct the UE about information regarding one or more candidate target cells for Conditional LTM (or for which the execution conditions are to be evaluated). The evaluation of the execution conditions of the UE may be triggered by the predetermined MAC CE.

[0060] The UE may start the execution evaluation for the candidate target cells indicated by the predetermined MAC CE. If there is a target cell that satisfies the execution conditions, the UE may perform LTM (or mobility) for the target cell. For example, if there is a candidate cell that satisfies the execution conditions, the UE may detach from the source (e.g., source cell) and apply the configurations of the target cell that becomes the handover destination (e.g., target configurations).

[0061] For example, if a given MAC CE indicates multiple candidate cells (or candidate target cells), the UE may consider the execution conditions corresponding to each candidate cell (or execution conditions common to the multiple candidate cells) to determine a specific target cell for mobility / cell switch. The given MAC CE may indicate the execution conditions / events corresponding to each candidate cell (or common to the multiple candidate cells).

[0062] The UE may perform a random access procedure (RACH-based CLTM) to the selected (eg, switched to) target cell.

[0063] For example, if the UE does not have a valid Timing Advance (TA) for the target cell / candidate cell (or a destination cell), it may perform a random access procedure to obtain a TA value for the target cell. On the other hand, if the UE has a valid Timing Advance for the target cell / candidate cell (or a destination cell), it may not perform the random access procedure (or may omit / skip the random access procedure). Note that the random access procedure may be performed if the UE has a valid TA for the target cell.

[0064] After receiving a predetermined MAC CE, the UE may determine whether to apply a random access procedure based on at least one of the predetermined MAC CE and an RRC parameter (e.g., an RRC parameter related to the setting of a TA acquisition method). For example, the UE may determine whether to apply a random access procedure based on a value of a predetermined field (e.g., a timing advance command field) included in the predetermined MAC CE. The UE may also determine whether to apply a random access procedure based on a TA acquisition method set by an RRC parameter (or the TA acquisition method and the value of a predetermined field of the predetermined MAC CE).

[0065] Note that in FIG. 3, it shows the case where the indication of the candidate target cell for conditional LTM (or the candidate target cell for evaluating the execution condition) is performed by MAC CE, but it is not limited thereto. For example, information regarding the candidate target cell for conditional LTM may be indicated to the UE by DCI. Alternatively, by MAC CE, the correspondence (or mapping) between the information regarding a plurality of candidate target cells for conditional LTM (or a plurality of candidate target cells for conditional LTM and the execution condition) and the code point of a predetermined field of DCI is indicated, and a specific candidate target cell for conditional LTM may be indicated by DCI.

[0066] <<LTM completion>> The LTM cell switch procedure may be completed when the UE transmits a predetermined message to the target cell / candidate cell.

[0067] In the case of RACH-based LTM, the UE may determine that the execution of LTM has been successfully completed when the random access procedure has been successfully completed.

[0068] In the case of RACH-less (for example, RACH-less) LTM, the UE may determine that the execution of LTM has been successfully completed when the UE determines that the network has successfully received the first UL data. For example, in the case of RACH-less LTM, the UE may transmit an RRC reconfiguration completion message and transmit the first data to the target cell. The UE may determine that it has successfully received the first UL data by receiving a PDCCH addressed to the C-RNTI of the UE in the target cell. The PDCCH corresponds to a PDCCH that schedules a new transmission following the first UL data.

[0069] <Example operation 2 of conditional LTM> FIG. 4 is a diagram showing a second example of the conditional LTM operation. In FIG. 4, as the operation of the conditional LTM, steps of LTM preparation (e.g., CLTM preparation), early synchronization and LTM execution (e.g., Early sync and CLTM execution), and LTM completion (e.g., CLTM completion) are shown, but the steps of the 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.

[0070] <<LTM Preparation>> It can be performed in the same manner as the LTM preparation in FIG. 3.

[0071] <<Early Sync and LTM Execution>> The UE performs early synchronization (e.g., Early sync) with the candidate cell and LTM execution.

[0072] After the RRC configuration (e.g., RRC re-configuration) of the LTM candidate cell, the UE may perform DL early synchronization with the candidate cell. For example, the UE may perform DL synchronization with the configured candidate cell.

[0073] The UE performs measurements (e.g., L1 measurements) on the configured candidate cell and transmits a measurement report. The measurement report may be an L1 measurement report.

[0074] The base station (or source base station / serving cell) makes a conditional LTM (CLTM) decision based on the measurement report sent from the UE. For example, the base station determines the conditional LTM for one or more candidate target cells for which the execution condition can be evaluated (or for which the UE needs to evaluate the execution condition). The one or more candidate target cells for which the execution condition can be evaluated may be determined based on the measurement report sent from the UE.

[0075] The base station may transmit a predetermined MAC CE to the UE. The base station may use the predetermined MAC CE to indicate to the UE information regarding one or more candidate target cells for conditional LTM (or for which the execution condition is to be evaluated). The predetermined MAC CE may trigger the UE to evaluate the execution condition.

[0076] The UE may perform DL synchronization with the LTM candidate cell after RRC configuration (e.g., RRC reconfiguration) of the candidate cell. In this case, the UE may perform UL synchronization with the candidate target cell for conditional LTM indicated by a predetermined MAC CE. In this way, by performing UL synchronization after receiving a predetermined MAC CE, it is possible to reduce the number of cells for which UL synchronization is performed.

[0077] The UE may also start performance evaluation for candidate target cells indicated by a predetermined MAC CE. If there is a target cell that satisfies the performance condition, the UE may perform LTM (or mobility) for the target cell. For example, if the performance condition is satisfied, the UE may detach (e.g., detach) from a source (e.g., source cell) and apply the configuration (e.g., target configurations) of the target cell to which the handover is to be performed. Note that the UE may perform UL synchronization after the performance evaluation.

[0078] For example, if a given MAC CE indicates multiple candidate cells (or candidate target cells), the UE may determine a specific target cell for mobility / cell switch by considering the execution conditions / events corresponding to each candidate cell (or common to multiple candidate cells). The given MAC CE may indicate the execution conditions / events corresponding to each candidate cell (or common to multiple candidate cells).

[0079] The UE may perform a random access procedure (RACH-based CLTM) to the selected (eg, switched to) target cell.

[0080] For example, if the UE does not have a valid Timing Advance (TA) for the target cell / candidate cell (or a destination cell), it may perform a random access procedure to obtain a TA value for the target cell. On the other hand, if the UE has a valid Timing Advance for the target cell / candidate cell (or a destination cell), it may not perform the random access procedure (or may omit / skip the random access procedure). Note that the random access procedure may be performed if the UE has a valid TA for the target cell.

[0081] After receiving a predetermined MAC CE, the UE may determine whether to apply a random access procedure based on at least one of the predetermined MAC CE and an RRC parameter (e.g., an RRC parameter related to the setting of a TA acquisition method). For example, the UE may determine whether to apply a random access procedure based on a value of a predetermined field (e.g., a timing advance command field) included in the predetermined MAC CE. The UE may also determine whether to apply a random access procedure based on a TA acquisition method set by an RRC parameter (or the TA acquisition method and the value of a predetermined field of the predetermined MAC CE).

[0082] Note that in FIG. 4, the case where the indication of the candidate target cell for conditional LTM (or the candidate target cell for evaluating the execution condition) is performed by MAC CE is shown, but it is not limited thereto. For example, information regarding the candidate target cell for conditional LTM may be indicated to the UE by DCI. Alternatively, by MAC CE, the correspondence (or mapping) between the information regarding a plurality of candidate target cells for conditional LTM (or a plurality of candidate target cells for conditional LTM and the execution condition) and the code point of a predetermined field of DCI is indicated, and a candidate target cell for a specific conditional LTM may be indicated by DCI.

[0083] <<LTM completion>> It can be performed in the same manner as the LTM completion in FIG. 3.

[0084] <Example of operation of target cell in conditional LTM> FIG. 5 is a diagram showing an example of the operation of the target cell in conditional LTM. In FIG. 5, as the operation of conditional LTM, steps of LTM preparation (e.g., CLTM preparation), early sync (e.g., Early sync), LTM execution (e.g., CLTM execution), and LTM completion (e.g., CLTM completion) (the example in FIG. 3) are shown, but the steps of LTM are not limited thereto. Some steps (or operations included in the steps) may be omitted, the order of the operations included in some steps and the other operations included in other steps may be interchanged (e.g., the example in FIG. 4), or other steps (or other operations) may be added.

[0085] <<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 a layer 3 measurement report.

[0086] The base station (or source base station / serving cell) performs LTM candidate preparation (e.g., LTM candidate preparation) based on the measurement report transmitted from the UE. In this case, information may be exchanged / shared among a plurality of candidate cells (the serving cell may be included). The information exchanged / shared among the plurality of candidate cells may be at least one of information regarding the measurement report reported from the UE, information regarding the settings of the candidate cells to be set, and information regarding the execution conditions for each candidate cell.

[0087] The base station performs LTM candidate configuration (e.g., LTM candidate configuration) and sets the execution conditions (e.g., execution conditions) for the candidate cells by means of RRC (e.g., RRC reconfiguration). Information regarding the candidate cells may be set in the UE by the LTM candidate configuration. The execution conditions for each candidate cell may be set for each candidate cell (or for each of a plurality / all of the candidate cells) by setting the execution conditions for the candidate cells.

[0088] For the setting of the execution conditions for the candidate cells, Option 2-1 / Option 2-2 may be applied.

[0089] <<Early sync>> The UE performs early synchronization (e.g., Early sync) with the candidate cells. The DL / UL early synchronization with the candidate cells may be performed by the UE after the RRC configuration (e.g., RRC reconfiguration) of the LTM candidate cells. The UL early synchronization may be performed after the transmission of the measurement report in the LTM execution step (e.g., L1 measurement report) or after receiving a predetermined MAC CE.

[0090] <<LTM execution>> The UE performs measurements (e.g., L1 measurements) on the set candidate cells and transmits a measurement report. The measurement report may be an L1 measurement report.

[0091] The base station (or source base station / serving cell) makes a conditional LTM (CLTM) decision based on the measurement report sent from the UE. For example, the base station determines the conditional LTM for one or more candidate target cells for which the execution condition can be evaluated (or for which the UE needs to evaluate the execution condition). The one or more candidate target cells for which the execution condition can be evaluated may be determined based on the measurement report sent from the UE.

[0092] The base station may transmit a predetermined MAC CE to the UE. The base station may use the predetermined MAC CE to indicate to the UE information regarding one or more candidate target cells for conditional LTM (or for which the execution condition is to be evaluated). The predetermined MAC CE may trigger the UE to evaluate the execution condition.

[0093] The base station may also notify the candidate cell of information related to the conditional LTM (CLTM) decision. For example, the base station may notify the candidate cell of information related to one or more candidate target cells for the conditional LTM (or to be evaluated for the execution conditions). The candidate cells to which the information is notified may be limited to candidate cells selected as candidate cells for the conditional LTM (CLTM), or may not be limited to such candidate cells (for example, the information may also be notified to candidate cells that are not selected as candidate cells for the conditional LTM (CLTM)).

[0094] The UE may initiate an implementation evaluation for candidate target cells indicated by a predetermined MAC CE. If a target cell satisfies an implementation condition, the UE may implement LTM (or mobility) for the target cell. For example, if the implementation condition is met, the UE may detach (e.g., detach) from a source (e.g., source cell) and apply the configurations (e.g., target configurations) of the target cell to which the handover is to be performed.

[0095] The UE may perform a random access procedure for the selected (e.g., target cell to be switched to) target cell. For example, if the UE does not have a valid timing advance for the target cell / candidate cell (or the cell to be switched to), it may perform a random access procedure to obtain the TA value for the target cell. On the other hand, if the UE has a valid timing advance (TA: Timing Advance) for the target cell / candidate cell (or the cell to be switched to), the random access procedure may not need to be performed (or the random access procedure may be omitted / skipped).

[0096] After receiving a predetermined MAC CE, the UE may determine whether to apply the random access procedure based on at least one of the predetermined MAC CE and RRC parameters (e.g., RRC parameters related to the setting of the TA acquisition method). For example, based on the value of a predetermined field (e.g., the timing advance command field) included in the predetermined MAC CE, it may be determined whether to apply the random access procedure. Based on the TA acquisition method set by the RRC parameter (or the value of the predetermined field of the TA acquisition method and the predetermined MAC CE), it may be determined whether to apply the random access procedure.

[0097] Here, although the case where the candidate target cell for conditional LTM (or the candidate target cell for evaluating the execution condition) is indicated by the MAC CE is shown, it is not limited thereto. For example, the UE may be instructed by DCI about the information related to the candidate target cell for conditional LTM. Alternatively, the MAC CE may indicate the correspondence (or mapping) between the information related to a plurality of candidate target cells for conditional LTM (or a plurality of candidate target cells for conditional LTM and the execution condition), and the code point of a predetermined field of the DCI, and the candidate target cell for a specific conditional LTM may be instructed by the DCI.

[0098] <<LTM completion>> The UE may complete the LTM cell switch procedure by transmitting a predetermined message to a selected (e.g., target / candidate cell to be switched to) target cell / candidate cell.

[0099] In the case of RACH-based LTM, the UE may determine that the execution of LTM has completed successfully when the random access procedure has completed successfully.

[0100] <Example 3 of Conditional LTM Operation> FIG. 6 is a diagram showing a third example of conditional LTM operation. In FIG. 6, as the operation of conditional LTM, steps of LTM preparation (e.g., CLTM preparation), early synchronization (e.g., Early sync), LTM execution (e.g., CLTM execution), and LTM completion (e.g., CLTM 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. Also, FIG. 6 may be preferably applied to RACH-less CLTM.

[0101] <<LTM Preparation>> In LTM preparation, a UE (e.g., UE in RRC_CONNECTED) that is RRC-connected to the serving cell transmits a measurement report. The measurement report may be a layer 3 measurement report. The base station (or source base station / serving cell) performs preparation of LTM candidates (e.g., LTM candidate preparation) based on the measurement report transmitted from the UE.

[0102] The base station performs LTM candidate setting (e.g., LTM candidate configuration) and setting of execution conditions (e.g., execution conditions) for candidate cells by RRC (e.g., RRC reconfiguration). Information regarding candidate cells may be set in the UE by the LTM candidate setting. Execution conditions may be set for each candidate cell (or for each of a plurality / all candidate cells) by setting the execution conditions for candidate cells.

[0103] For the setting of execution conditions for candidate cells, Option 1 / Option 2 may be applied.

[0104] <<Early sync>> The UE performs early synchronization (e.g., Early sync) with candidate cells. DL / UL early synchronization with candidate cells may be performed by the UE after the RRC setting (e.g., RRC re - setting) of the LTM candidate cells. UL early synchronization may be performed after transmission of a measurement report (e.g., L1 measurement report) in the LTM execution step or after receiving a predetermined MAC CE.

[0105] <<LTM execution>> The UE performs measurements (e.g., L1 measurements) on the set candidate cells and transmits a measurement report. The measurement report may be an L1 measurement report.

[0106] The base station (or source base station / serving cell) makes a conditional LTM (CLTM) decision based on the measurement report transmitted from the UE. For example, the base station determines the conditional LTM for one or more candidate target cells for which execution conditions can be evaluated (or for which the UE needs to evaluate the execution conditions). One or more candidate target cells for which execution conditions can be evaluated may be determined based on the measurement report transmitted from the UE.

[0107] The base station may transmit a predetermined MAC CE to the UE. The base station may use the predetermined MAC CE to instruct the UE about information regarding one or more candidate target cells for conditional LTM (or for which execution conditions are to be evaluated). The evaluation of the UE's execution conditions may be triggered by the predetermined MAC CE.

[0108] The UE may start an execution evaluation for the candidate target cells indicated by the predetermined MAC CE. If there is a target cell that satisfies the execution conditions, the UE may perform LTM (or mobility) for the target cell. For example, if the UE satisfies the execution conditions, it may detach from the source (e.g., source cell) and apply the configurations of the target cell to be switched to (e.g., target configurations).

[0109] After the UE determines mobility or a cell switch (or selects a new target cell) based on the evaluation of the execution conditions, it may transmit at least one of a message regarding the completion of RRC reconfiguration (e.g., RRCReconfigurationComplete) and a MAC CE (e.g., a new MAC CE) to the new target cell. The CLTM determination of the UE may be instructed to the new target cell by the MAC CE.

[0110] <<LTM completion>> The LTM cell switch procedure may be completed when the UE transmits a predetermined message / MAC CE to the target cell / candidate cell.

[0111] In the case of RACH-less LTM, the UE may determine that the LTM has been successfully completed when the UE determines that the network has successfully received the first UL data. For example, in the case of RACH-less LTM, the UE may transmit the RRC reconfiguration complete message / MAC CE and transmit the first data to the target cell. The UE may determine that it has successfully received the first UL data by receiving a PDCCH addressed to the C-RNTI of the UE in the target cell. The PDCCH corresponds to a PDCCH that schedules a new transmission following the first UL data.

[0112] <Example 4 of the operation of conditional LTM> FIG. 7 is a diagram showing a fourth example of the operation of conditional LTM. In FIG. 7, as the operation of conditional LTM, steps of LTM preparation (e.g., CLTM preparation), early sync (e.g., Early sync), LTM execution (e.g., CLTM execution), and LTM completion (e.g., CLTM completion) are shown, but the steps of LTM are not limited thereto. 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. Also, FIG. 7 may be preferably applied to RACH-less CLTM.

[0113] <<LTM preparation>> It can be performed in the same manner as the LTM preparation in FIG. 6.

[0114] <<Early sync>> It can be performed in the same manner as the early sync in FIG. 6.

[0115] <<LTM execution>> The UE performs measurements (e.g., L1 measurements) on the configured candidate cells and transmits a measurement report, which may be an L1 measurement report.

[0116] The base station (or source base station / serving cell) makes a conditional LTM (CLTM) decision based on the measurement report sent from the UE. For example, the base station determines the conditional LTM for one or more candidate target cells for which the execution condition can be evaluated (or for which the UE needs to evaluate the execution condition). The one or more candidate target cells for which the execution condition can be evaluated may be determined based on the measurement report sent from the UE.

[0117] The base station may transmit a predetermined MAC CE to the UE. The base station may use the predetermined MAC CE to indicate to the UE information regarding one or more candidate target cells for conditional LTM (or for which the execution condition is to be evaluated). The predetermined MAC CE may trigger the UE to evaluate the execution condition.

[0118] The UE may initiate an implementation evaluation for candidate target cells indicated by a predetermined MAC CE. If a target cell satisfies an implementation condition, the UE may implement LTM (or mobility) for the target cell. For example, if the implementation condition is met, the UE may detach (e.g., detach) from a source (e.g., source cell) and apply the configurations (e.g., target configurations) of the target cell to which the handover is to be performed.

[0119] After the UE determines mobility or cell switching (or selects a new target cell) based on the evaluation of execution conditions, it may transmit a predetermined MAC CE to the current serving cell (e.g., the serving cell before cell switching). The UE's CLTM decision may be indicated to the current serving cell by the MAC CE. The predetermined MAC CE may include at least one of information about the selected target cell and information about the latest L1 beam measurement / event-triggered L1 beam measurement / reporting result of the L1 beam measurement.

[0120] After the UE transmits a predetermined MAC CE to the current serving cell, it may start a predetermined timer (or a new timer) and start monitoring the PDCCH transmitted from the reported / indicated new target cell. For example, the UE may start a predetermined timer after transmitting the predetermined MAC CE and control to monitor the PDCCH until the predetermined timer expires.

[0121] <<LTM completion>> If the UE detects a DCI format (e.g., DCI format 1_0 / 0_0, etc.) to which the C-RNTI is applied from the target cell before the predetermined timer expires, it may determine that the CLTM is successful (or the CLTM is completed). Otherwise, it may determine that the CLTM has failed.

[0122] <Example operation of conditional LTM 5> FIG. 8 is a diagram showing a fifth example of the conditional LTM operation. In FIG. 8, as the operations of the CLTM, steps of LTM preparation (e.g., CLTM preparation), early synchronization (e.g., Early sync), and LTM execution (e.g., CLTM execution) are shown, but the steps of the 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. For example, at least a part of the processes in FIGS. 3 to 7 may be added.

[0123] <<LTM Preparation>> In LTM preparation, a UE (e.g., UE in RRC_CONNECTED) that is RRC-connected to a serving cell transmits a measurement report. The measurement report may be a layer 3 measurement report. The base station (or source base station / serving cell) determines the execution of the LTM based on the measurement report transmitted from the UE.

[0124] The base station (Source gNB) transmits an RRC reconfiguration message including the LTM candidate cell setting of one or more candidate cells to the UE. The UE saves the LTM candidate cell setting and transmits an RRC reconfiguration complete message to the gNB. The base station (Source gNB) transmits signaling including the LTM candidate cell setting to the base station of the candidate cell (Candidate gNB).

[0125] <<Early Sync>> The UE performs early synchronization (e.g., Early sync) with the candidate cell. The DL / UL early synchronization with the candidate cell may be performed by the UE after the RRC setting (e.g., RRC reselection) of the LTM candidate cell.

[0126] <<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.

[0127] 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 the LTM cell switch decision is made. 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 the cell switch decision is made, so the target gNB can quickly secure resources for the UE. Note that in Rel8 LTM, this signaling is forwarded when the LTM cell switch decision is made.

[0128] The UE evaluates whether a second event is met and, if so, determines to perform an LTM cell switch. The second event may be the same as or different from the first event. For example, the UE may determine to perform an LTM cell switch and perform a cell switch procedure when the event is met for a predetermined time, or when all events are met within a predetermined time.

[0129] The UE applies the target cell configuration, and the UE, the base station (Source gNB), and the base station (Candidate gNB) (Target gNB) perform a cell switch procedure.

[0130] The event for transmitting the first UL signal and the event for transmitting the second UL signal may be the same or different, and the event for transmitting the first UL signal and the condition for performing the cell switch procedure after transmitting the second UL signal may be the same.

[0131] (analysis) Rel. 18 supports subsequent LTM. Subsequent LTM is a subsequent LTM cell switch procedure between multiple candidate cells, and the UE does not need to be reconfigured by the network. Subsequent LTM is performed by repeating the steps of early synchronization, LTM (cell switch) execution, and LTM (cell switch) completion without releasing other LTM candidate configurations after each LTM (cell switch) is completed. In other words, the next cell switch can be configured using the same LTM configuration as the previous cell switch.

[0132] On the other hand, the introduction of subsequent CLTM is being considered for future wireless communication systems (Rel. 19 and later). However, the details of subsequent CLTM have not been fully explored.

[0133] For example, there is insufficient consideration as to how to support subsequent CLTM, whether Rel.18 LTM and Rel.19 CLTM can be configured for a UE simultaneously, whether subsequent LTM and subsequent CLTM are supported (simultaneously), and how subsequent LTM and subsequent CLTM are supported (simultaneously).

[0134] If these considerations are not sufficient, it may not be possible to achieve lower latency communications using LTM / CLTM, which could result in suppression of improvements in communication quality / throughput.

[0135] Therefore, the present inventors came up with a method for solving these problems.

[0136] Hereinafter, embodiments according to 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.

[0137] (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.

[0138] 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."

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0144] In this disclosure, the terms drop, abort, cancel, puncture, rate match, postpone, do not transmit, etc. may be read interchangeably.

[0145] In the present disclosure, the terms index, identifier (ID), indicator, resource ID, etc. may be interchangeable. In the present disclosure, the terms sequence, list, set, group, cluster, subset, pool, etc. may be interchangeable.

[0146] In this disclosure, the terms panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmitting entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, etc. may be read as interchangeable.

[0147] In the present disclosure, base station, gNB, and network (NW) may be interpreted as interchangeable.

[0148] In the present disclosure, cell group, serving cell group, master cell group (MCG), and secondary cell group (SCG) may be interchangeable. L1 / L2, L1 / L2 signaling, and DCI / MAC CE may be interchangeable. A serving cell may be replaced with a cell that transmits a PDSCH. A candidate cell may refer to a cell that is a candidate to become a serving cell through L1 / L2 inter-cell mobility. L1L2-triggered mobility (LTM) and L1 / L2 inter-cell mobility may be interchangeable.

[0149] In the present disclosure, the terms cell, PCI, serving cell, source serving cell, source cell, CC, BWP, BWP within CC, and band may be interchangeable. In the present disclosure, the terms cell, PCI, cell with additional PCI, additional cell, other cell, non-serving cell, cell with a different PCI, candidate cell, candidate serving cell, cell with a PCI different from the PCI of the current serving cell, another serving cell, and target cell may be interchangeable. A target cell may be a cell selected from multiple candidate cells. In the present disclosure, the terms switch, change, and update may be interchangeable. A serving cell may be interchangeable with a serving cell before a switch or a serving cell after a switch.

[0150] In this disclosure, terms such as table, mapping, association, list, format, content, report, etc. may be read interchangeably.

[0151] In the present disclosure, (new) MAC CE, UCI, cell switch command, beam switch command, beam report MAC CE, and cell switch MAC CE may be read interchangeably.

[0152] In the present disclosure, the terms report, resource for report, and resource may be interchangeable. For example, a first resource and a first report may be interchangeable, and a second resource and a second report may be interchangeable.

[0153] In the present disclosure, the number of beams and the number of resources may be read interchangeably.

[0154] In the present disclosure, serving may be interchangeably read as serving beam / serving cell / SpCell.

[0155] In the present disclosure, neighbor may be interchangeably read as a beam / cell other than the serving beam / serving cell / SpCell / SCell.

[0156] In this disclosure, the pair of RS index and L1-RSRP / SINR may be referred to as an L1 measurement report, i.e., the L1 measurement report may include the pair of RS index and L1-RSRP / SINR.

[0157] In the present disclosure, candidate cells, target cells, neighboring cells, cells, etc. may be read interchangeably.

[0158] In this disclosure, CLTM, Rel. 19 CLTM, and subsequent CLTM may be interchangeable. In this disclosure, LTM, Rel. 18 LTM, and subsequent LTM may be interchangeable.

[0159] In the present disclosure, (other) CLTM settings, parameters related to execution conditions for CLTM, candidate cell settings for CLTM, candidate cell list for CLTM, TCI state settings for CLTM, early UL synchronization settings for CLTM, etc. may be read as interchangeable.

[0160] In the present disclosure, (other) LTM settings, parameters related to execution conditions for LTM, candidate cell settings for LTM, candidate cell list for LTM, TCI state settings for LTM, early UL synchronization settings for LTM, etc. may be read as interchangeable.

[0161] (Wireless communication method) The UE may execute / control CLTM and related operations by applying the present disclosure (the various provisions described above and the following embodiments). The NW / BS / gNB may provide / transmit to the UE settings / instructions, etc., for the UE to realize the control. Furthermore, the NW / BS / gNB may execute various controls necessary to receive information, etc., transmitted from the UE.

[0162] In the present disclosure, each embodiment / option may be applied alone or in combination with other embodiments / options.

[0163] First Embodiment The first embodiment relates to the operation of the subsequent CLTM.

[0164] The UE may be configured / provided with execution condition(s) for CLTM for the serving cell and each candidate cell by RRC signaling.

[0165] The parameters relating to the execution conditions may be set in the LTM configuration (for example, LTM-Config), for example.

[0166] In this case, it may be possible to set the execution conditions when multiple (eg, all) candidate cells are serving cells.

[0167] For example, a maximum of N execution conditions (for example, N may be the number of serving cells (patterns) * the number of candidate cells (patterns)) may be set for the UE. For example, when candidate cells #A, #B, and #C are set, a maximum of six execution conditions (3 serving cell patterns * 2 candidate cell patterns) may be set.

[0168] Furthermore, the parameters relating to the execution conditions may be set, for example, in the parameters of the LTM candidate (for example, LTM-Candidate).

[0169] Furthermore, parameters relating to the execution conditions may be set in, for example, an LTM candidate configuration (for example, an LTM-Candidate configuration).

[0170] In this case, for example, the parameters related to the execution conditions may be set in the CSI reporting configuration of the serving cell at the time of an initial cell switch, and in the case of a subsequent LTM, may be set in the CSI reporting configuration within the LTM candidate configuration.

[0171] For example, assume that candidate cells #A, #B, and #C are configured. When an initial cell switch occurs, the execution condition (e.g., comparison between the current serving cell and candidate cells #A / #B / #C) may be configured in the LTM-CSI reporting configuration of the serving cell configuration.

[0172] Furthermore, when a cell switch from the serving cell to the candidate cell #A occurs, the execution condition (e.g., comparison between the candidate cell #A and the candidate cell #B / #C) set in the LTM-CSI reporting configuration of the serving cell configuration (in this case, the serving cell = the candidate cell #A) may be used. In this case, the UE may assume that different parameters / event types are set for each execution condition.

[0173] When the RRC signaling is provided to the UE, the UE may perform a specific action related to the evaluation of the serving cell's execution conditions (for example, at least one of the actions of options 1-1 to 1-3 below) (see FIG. 9).

[0174] <<Option 1-1>> The UE may initiate evaluation of the serving cell's performance conditions in response to RRC (re)configuration.

[0175] <<Option 1-2>> The UE may assume that the initial state for execution condition evaluation is off (which may mean, for example, that the UE does not initiate evaluation).

[0176] <<<Option 1-2-1>>> In option 1-2, the initiation of the execution condition evaluation may be based on a [new] MAC CE from the NW.

[0177] <<<Option 1-2-2>>> In option 1-2-2, the initiation of the execution condition evaluation may be based on a trigger / instruction from the UE to the NW (e.g., an event-triggered beam report / UE-initiated beam report (UEIBR)).

[0178] In this case, for example, event-triggered beam reporting / UEIBR may be [always] configured / supported for Rel.19 CLTM.

[0179] Note that options 1-2-1 / 1-2-2 are also applicable to other embodiments / options.

[0180] <<Options 1-3>> The UE may be configured / provided with a (separate) [new] RRC parameter that indicates whether or not to initiate evaluation upon RRC (re)configuration.

[0181] The new RRC parameter may be, for example, one bit.

[0182] The new RRC parameters may be common to multiple (e.g., all [to be configured]) cells, may be separate for each cell, may be separate for multiple cells (cell groups), or may be separate for one serving cell and multiple (e.g., all [to be configured]) candidate cells.

[0183] The UE may determine whether to start evaluation according to the RRC (re)configuration based on the new RRC parameters.

[0184] After Rel.19 CLTM is executed / completed, for a new serving cell (serving cell after CLTM execution / completion) for which execution conditions were provided in advance when it was still a candidate cell, at least one of the following options 1-4 to 1-6 may be applied regarding whether and when CLTM is initiated.

[0185] <<Options 1-4>> After completing CLTM, the UE may start evaluating the execution conditions for the new serving cell.

[0186] <<Options 1-5>> The UE may assume that the initial state for performance condition evaluation for the new serving cell is off.

[0187] The UE may not start evaluating the execution condition until at least one of the trigger by RRC signaling / MAC CE from the NW (eg, option 1-2-1) and the trigger by the UE (eg, option 1-2-2) is executed.

[0188] <<Options 1-6>> The UE may determine / decide whether to start evaluating the execution conditions for the new serving cell based on new parameters set when the new serving cell was a candidate cell (as described in options 1-3 above).

[0189] In addition, in at least one of options 1-1 to 1-6, upon completion of each Rel.19 CLTM, the UE does not have to release other CLTM settings (unless explicitly instructed by the NW to release the CLTM settings).

[0190] Whether the UE supports subsequent CLTMs (i.e., CLTMs that do not release other CLTM configurations) after the completion of each Rel.19 CLTM may be based on the reporting of UE capability information.

[0191] In addition, whether the UE needs to perform subsequent CLTM may be individually configured / instructed using RRC signaling / MAC CE.

[0192] According to the first embodiment, subsequent CLTM operations can be defined / supported by appropriately defining UE operations related to execution conditions for CLTM.

[0193] <Second embodiment> The second embodiment relates to simultaneous setting of Rel. 18 LTM and Rel. 19 CLTM.

[0194] The UE may determine whether Rel.18 LTM and Rel.19 CLTM can be configured simultaneously [based on specifications / settings / instructions].

[0195] In the present disclosure, simultaneous configuration of Rel.18 LTM and Rel.19 CLTM may mean a state in which both Rel.18 LTM and Rel.19 CLTM are configured for a UE (regardless of whether they are configured at the same time).

[0196] <<Embodiment 2-1>> The UE may not assume / expect Rel.18 LTM and Rel.19 CLTM to be configured simultaneously.

[0197] In other words, the UE may determine that Rel.19 CLTM is not set when Rel.18 LTM is set, and may determine that Rel.18 LTM is not set when Rel.19 CLTM is set.

[0198] <<Embodiment 2-2>> The UE may be configured with Rel.18 LTM and Rel.19 CLTM simultaneously.

[0199] For Rel.18 LTM completion, at least one of the following options 2-2-1 to 2-2-3 may be applied.

[0200] <<<Option 2-2-1>>> The UE may not release other CLTM candidate configurations (unless explicitly instructed by the NW to release the CLTM (candidate) configuration) to support subsequent CLTMs (e.g., options 1-4 / 1-5 / 1-6 above) after LTM completion.

[0201] <<<Option 2-2-2>>> The UE may not store other CLMT candidate configurations.

[0202] In this case, the UE may store [only] other LTM candidate configurations.

[0203] <<<Option 2-2-3>>> Based on at least one of the configuration by the RRC and the reporting of the UE capability information, it may be determined / decided whether the UE needs to store / release the CLTM candidate configuration.

[0204] For Rel.19 CLTM completion, at least one of the following options 2-2-4 to 2-2-6 may be applied.

[0205] <<<Option 2-2-4>>> The UE may not release other LTM candidate configurations (unless explicitly instructed by the NW to release the LTM (candidate) configurations) to support subsequent (Rel.18) LTM after CLTM completion.

[0206] <<<Option 2-2-5>>> The UE may not need to store other LMT candidate settings.

[0207] <<<Option 2-2-6>>> Based on at least one of the configuration by the RRC and the reporting of the UE capability information, it may be determined whether the UE needs to store / release the (Rel.18) LTM candidate configuration.

[0208] For example, among the above options, a combination of a corresponding option for LTM and a corresponding option for CLTM (for example, at least one of a combination of options 2-2-1 and 2-2-4, a combination of options 2-2-2 and 2-2-5, and a combination of options 2-2-3 and 2-2-6) may be applied. By applying corresponding operations for CLTM and LTM, the complexity of the implementation of the UE can be reduced.

[0209] For example, among the above options, a combination other than the combination of the corresponding CLTM option and LTM option (for example, a combination of options 2-2-2 and 2-2-4) may be applied.

[0210] When another CLTM / LTM candidate configuration is released, some of the configurations of the CLTM / LTM candidate configuration may be released based on the relationship between the configuration for CLTM and the configuration for LTM.

[0211] The part of the settings may be, for example, settings other than the common setting portion between the settings for CLTM and the settings for LTM (for example, dedicated settings for each of the settings for CLTM and the settings for LTM).

[0212] The relationship between the settings for CLTM and the settings for LTM will be described in detail in the third embodiment below.

[0213] According to the second embodiment, simultaneous setting of Rel. 18 LTM and Rel. 19 CLTM can be appropriately defined.

[0214] <Third embodiment> The third embodiment relates to the relationship between the settings for CLTM and the settings for LTM.

[0215] <<Option 3-1>> The settings for CLTM and the settings for LTM may be defined / configured / provided separately.

[0216] For example, separate candidate cell configurations / candidate cell lists may be configured / provided for LTM and CLTM, respectively.

[0217] <<Option 3-2>> One or more of the settings for CLTM and the settings for LTM may be commonly defined / configured / provided.

[0218] For example, at least one of the following settings may be common for both CLTM and LTM: · Candidate cell configuration for each candidate cell configuration. · Candidate cell list. LTM TCI state setting. -Early UL sync setting.

[0219] In this embodiment, the same candidate cell list may be used for the LTM / CLTM candidate cell list.

[0220] For example, among the candidate cells in the candidate cell list, a plurality of (for example, all) candidate cells may be applied for CLTM.

[0221] For example, some of the candidate cells in the candidate cell list may be applied for CLTM.

[0222] To identify whether CLTM applies for a candidate cell, an explicit parameter (e.g., a one-bit indication) may be configured / provided for each candidate cell, or the method for enabling UE-based TA measurements may be reused.

[0223] In addition, in this embodiment, separate (different) candidate cell lists may be used for the LTM / CLTM candidate cell lists.

[0224] According to the third embodiment described above, it is possible to appropriately define the relationship between the settings for CLTM and the settings for LTM.

[0225] <Embodiment 4> Embodiment 4 relates to the UE capabilities and settings according to the above Embodiments 1-3.

[0226] (Corresponding) UE capabilities for each of the above embodiments / options may be defined / introduced.

[0227] RRC settings (based on the reporting of the UE capabilities) for enabling each of the above embodiments / options may be defined / introduced.

[0228] For example, UE capabilities indicating at least one of the following / RRC settings for enabling the following may be defined / introduced: · Whether to support subsequent CLTM / LTM (for example, at least one of subsequent CLTM / LTM that executes CLTM after CLTM, subsequent CLTM / LTM that executes CLTM after LTM, and subsequent CLTM / LTM that executes LTM after CLTM). · Whether to support additional triggers / updates / activations of execution condition evaluation from the NW using RRC signaling / MAC CE. · Whether to support additional triggers / updates / activations of execution condition evaluation from the UE to the NW.

[0229] <Supplementary> <<Notification of Information to the UE>> The notification of any information from the [Network (NW) (for example, Base Station (BS))] to the UE in the above embodiments (or in other words, the reception of any information from the BS by the UE) may be performed using physical layer signaling (for example, DCI), upper layer signaling (for example, RRC signaling, MAC CE), specific signals / channels (for example, PDCCH, PDSCH, reference signals), or a combination thereof.

[0230] When the above notification is performed by a MAC CE, the MAC CE may be identified by a new logical channel ID (LCID) that is not defined in the existing standard being included in the MAC sub-header.

[0231] 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 (RNTI) used for scrambling cyclic redundancy check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0232] Also, the notification of any information to the UE in the above-described embodiment may be performed periodically, semi-persistently, or aperiodically.

[0233] <<Notification of Information from UE>> The notification of any information from the UE to [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), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0234] When the above notification is performed by a MAC CE, the MAC CE may be identified by a new LCID that is not defined in the existing standard being included in the MAC sub-header.

[0235] When the above notification is performed by UCI, the above notification may be transmitted using PUCCH or PUSCH.

[0236] Also, the notification of any information from the UE in the above-described embodiment may be performed periodically, semi-persistently, or aperiodically.

[0237] <<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 the relevant upper layer parameters. The above specific processes / actions / controls / assumptions / 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.

[0238] The specific UE capabilities may indicate at least one of the following: Supporting specific processing / operations / control / information for at least one of the above embodiments. Supporting the Rel.18 CSI reporting framework for LTM. Support MIMO / mobility (e.g. CLTM) for Rel.19 and later. Support MAC CE-based Event Triggered Beam Reporting (UEIBR). ·Support event-triggered beam reporting / UEIBR for CLTM using UCI / MAC CE. · Support subsequent CLTM / LTM.

[0239] 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).

[0240] 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)).

[0241] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0242] Information on whether one or more of the above embodiments / options / choices / examples apply / are used, or which of the above embodiments / options / choices / examples apply / are used, may be based on several of the following methods: The information is configured by one or more higher layer parameters / RRC IEs. The information is determined by one or more relevant higher layer parameters / RRC IEs. The information is directed by the MAC CE / DCI. The information is based on one or more UE capabilities. The information is described / defined in the specification. The information is based on the conditions described / defined in the specification. The information is determined by a combination of several pieces of information above. For example, the information is determined by higher layer parameters / MAC CE / DCI settings / indications and reported by UE capabilities.

[0243] The above embodiments / options / choices may be combined into one embodiment / option / choice.

[0244] In the above embodiments, the RS to be measured may be a QCL source RS in an active TCI state / indicated / unified TCI state.

[0245] (Addendum) The following inventions are added regarding one embodiment of the present disclosure. [Appendix 1] A terminal having a receiving unit that receives parameters related to execution conditions for conditional Lower layer-triggered mobility (CLTM) for a serving cell and each candidate cell, and a control unit that controls a cell switch operation based on the parameters related to the execution conditions and controls not to release the parameters related to the execution conditions after completion of the cell switch operation. [Appendix 2] The terminal according to Supplementary Note 1, wherein the control unit performs a specific operation related to evaluation of execution conditions of the serving cell. [Appendix 3] The terminal according to claim 1 or 2, wherein the control unit does not assume that the CLTM and an LTM different from the CLTM are set simultaneously. [Appendix 4] The terminal according to claim 1 or 2, wherein the control unit assumes that the CLTM and an LTM different from the CLTM are set simultaneously.

[0246] (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.

[0247] 10 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).

[0248] 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.

[0249] 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.

[0250] 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))).

[0251] 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.

[0252] 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.

[0253] 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).

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0260] 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).

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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).

[0265] 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.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] 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.

[0270] 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.

[0271] 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.

[0272] 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.

[0273] 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).

[0274] (base station) 11 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.

[0275] 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.

[0276] 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.

[0277] 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.

[0278] 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.

[0279] 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.

[0280] 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.

[0281] 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.

[0282] 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.

[0283] 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.

[0284] 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.

[0285] 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 .

[0286] 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 .

[0287] 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.

[0288] 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.

[0289] 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.

[0290] 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.

[0291] 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.

[0292] 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.

[0293] The transceiver 120 may transmit parameters related to execution conditions for conditional Lower layer-triggered mobility (CLTM) for the serving cell and each candidate cell. The controller 110 may use the parameters related to the execution conditions to instruct control of a cell switch operation, and may instruct not to release the parameters related to the execution conditions after the cell switch operation is completed (first embodiment).

[0294] (user terminal) 12 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.

[0295] 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.

[0296] 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.

[0297] 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.

[0298] 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.

[0299] 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.

[0300] 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.

[0301] 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.

[0302] 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.

[0303] 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.

[0304] 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.

[0305] 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.

[0306] 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.

[0307] 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.

[0308] 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.

[0309] 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.

[0310] 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.

[0311] 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.

[0312] The transceiver 220 may receive parameters related to execution conditions for conditional Lower layer-triggered mobility (CLTM) for the serving cell and each candidate cell. The controller 210 may control a cell switch operation based on the parameters related to the execution conditions, and may control not to release the parameters related to the execution conditions after the cell switch operation is completed (first embodiment).

[0313] The control unit 210 may perform a specific operation related to the evaluation of the execution conditions of the serving cell (first embodiment).

[0314] The control unit 210 does not need to assume that the CLTM and an LTM different from the CLTM are set simultaneously (second embodiment).

[0315] The control unit 210 may assume that the CLTM and an LTM different from the CLTM are set simultaneously (second embodiment).

[0316] (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.

[0317] 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.

[0318] 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. 13 is a diagram illustrating 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.

[0319] 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.

[0320] 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.

[0321] 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.

[0322] 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.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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.

[0327] 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).

[0328] 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.

[0329] 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.

[0330] 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.

[0331] (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.

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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.

[0336] 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.

[0337] 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.

[0338] 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.

[0339] 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.

[0340] 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.

[0341] 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.

[0342] 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.

[0343] 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.

[0344] 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.

[0345] 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.

[0346] 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.

[0347] 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.

[0348] 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.

[0349] 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."

[0350] 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.

[0351] 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.

[0352] 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.

[0353] 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.

[0354] 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.

[0355] 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.

[0356] 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.

[0357] 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.

[0358] 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).

[0359] 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).

[0360] 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).

[0361] 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.

[0362] 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.

[0363] 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).

[0364] 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.

[0365] 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.

[0366] 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.

[0367] 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.

[0368] 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.

[0369] 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.

[0370] 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.

[0371] 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.

[0372] 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.

[0373] 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.

[0374] 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.

[0375] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0376] 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.

[0377] 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.

[0378] 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.

[0379] 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.

[0380] 14 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.

[0381] 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.

[0382] 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).

[0383] 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.

[0384] 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.

[0385] 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.

[0386] 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.

[0387] 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.

[0388] 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).

[0389] 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.

[0390] 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)).

[0391] 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.

[0392] 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.

[0393] 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.

[0394] 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.

[0395] 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.

[0396] 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).

[0397] 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."

[0398] 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.

[0399] 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.

[0400] 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.

[0401] 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.

[0402] 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...."

[0403] 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).

[0404] 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.

[0405] 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."

[0406] 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.

[0407] 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."

[0408] 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.

[0409] 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.

[0410] 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").

[0411] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0412] 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.

[0413] 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.

[0414] 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 receiving unit for receiving parameters related to execution conditions for conditional Lower layer-triggered mobility (CLTM) for a serving cell and each candidate cell; a control unit that controls a cell switch operation based on the parameter related to the execution condition, and controls not to release the parameter related to the execution condition after the cell switch operation is completed.

2. The terminal according to claim 1 , wherein the control unit performs a specific operation related to evaluation of an execution condition of the serving cell.

3. The terminal according to claim 1 , wherein the control unit does not assume that the CLTM and an LTM different from the CLTM are set simultaneously.

4. The terminal according to claim 1 , wherein the control unit assumes that the CLTM and an LTM different from the CLTM are set simultaneously.

5. receiving parameters related to execution conditions for conditional Lower layer-triggered mobility (CLTM) for a serving cell and each candidate cell; a step of controlling a cell switch operation based on the parameter related to the execution condition, and controlling not to release the parameter related to the execution condition after the cell switch operation is completed.

6. a transmitter for transmitting parameters related to execution conditions for conditional Lower layer-triggered mobility (CLTM) for a serving cell and each candidate cell; a control unit that instructs control of a cell switch operation using the parameters related to the execution conditions, and instructs not to release the parameters related to the execution conditions after the cell switch operation is completed.

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