Terminal, radio communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure comprises: a transmission unit that transmits an event-trigger beam report for conditional L1L2-triggered mobility (CLTM); and a control unit that evaluates whether a candidate cell and a beam satisfy an implementation condition of the CLTM, and implements a switch of a serving cell using the candidate cell and the beam that satisfy the implementation condition. According to the one aspect of the present disclosure, a cell switch can be appropriately performed when the CLTM is supported.

Description

Terminal, Wireless Communication Method, and Base Station

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

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was specified for the purpose of achieving further high data rates, low latency, etc. (Non-Patent Document 1). Also, for the purpose of further increasing capacity and enhancing LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel. 10-14) was specified.

[0003] Successor systems to LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G+(plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also being considered.

[0004] 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

[0005] In a future wireless communication system, it is assumed that conditional cell switching (also referred to as Conditional L1L2-triggered mobility (CLTM)) will be supported. For example, it is also conceivable that an LTM procedure is triggered by a UE based on conditions set by the network.

[0006] However, it is unclear how to control the specific operation / procedures when CLTM is supported. This could lead to a decrease in communication throughput due to the inability to achieve proper cell switching.

[0007] Therefore, one of the objectives of this disclosure is to provide a terminal, a wireless communication method, and a base station that can properly perform cell switching when CLTM is supported.

[0008] A terminal according to one aspect of the present disclosure is characterized by comprising: a transmitting unit that transmits an event trigger beam report for Conditional L1L2-triggered mobility (CLTM); and a control unit that evaluates whether candidate cells and beams satisfy the conditions for implementing the CLTM and performs a serving cell switch using candidate cells and beams that satisfy the conditions.

[0009] According to one aspect of this disclosure, cell switching can be properly performed when CLTM is supported.

[0010] Figure 1A shows an example of UE mobility in Rel. 17. Figure 1B shows an example of UE mobility in Rel. 18. Figure 2 shows an example of the LTM (R18 LTM) procedure in Rel. 18. Figure 3 shows the CLTM procedure in option 1a. Figure 4 shows the CLTM procedure in option 1b. Figure 5 shows the CLTM procedure in option 1c. Figure 6 shows the CLTM procedure in option 2. Figure 7 shows the CLTM procedure in option 3. Figure 8 shows an example of the schematic configuration of a wireless communication system according to one embodiment. Figure 9 shows an example of the configuration of a base station according to one embodiment. Figure 10 shows an example of the configuration of a user terminal according to one embodiment. Figure 11 shows an example of the hardware configuration of a base station and user terminal according to one embodiment. Figure 12 shows an example of a vehicle according to one embodiment.

[0011] (Inter-cell mobility) It is being considered that a UE may make UL transmissions to one or more cells / TRPs. In this case, the following Scenario 1 or Scenario 2 is possible. In this disclosure, a serving cell may be interpreted as a TRP within a serving cell. Layer 1 / layer 2 (L1 / L2) and DCI / Medium Access Control Control Element (MAC CE) may be interpreted as mutually exclusive. In this disclosure, a PCI different from the Physical Cell Identity (PCI) of the current serving cell may be simply referred to as a "different PCI". Non-serving cells, cells with different PCIs, and additional cells may be interpreted as mutually exclusive.

[0012] <Scenario 1> Scenario 1 is, for example, a scenario that corresponds to inter-cell mobility in a multi-TRP, but it may also be a scenario that does not correspond to inter-cell mobility in a multi-TRP.

[0013] (1) The UE receives from the serving cell the SSB settings for beam measurement of the TRP corresponding to a PCI different from that of the serving cell, and the settings necessary to use wireless resources for data transmission and reception (including resources for the different PCI). (2) The UE performs beam measurement of the TRP corresponding to the different PCI and reports the beam measurement results to the serving cell. (3) Based on the above report, the Transmission Configuration Indication (TCI) status associated with the TRP corresponding to the different PCI is activated by L1 / L2 signaling from the serving cell. (4) The UE transmits and receives using a dedicated channel on the TRP corresponding to the different PCI. (5) The UE must always cover the serving cell, including in the case of multiple TRPs. The UE must use common channels from the serving cell (Broadcast Control Channel (BCCH), Paging Channel (PCH)), etc., as in conventional systems.

[0014] In Scenario 1, when the UE sends and receives signals with the additional cell / TRP (the TRP corresponding to the PCI of the additional cell), the serving cell (the UE's assumption of the serving cell) remains unchanged. The UE sets higher-layer parameters related to the PCI of the non-serving cell from the serving cell. Scenario 1 may be applied, for example, in Rel. 17.

[0015] Figure 1A shows an example of UE movement in Rel. 17. It assumes a UE moving from a PCI#1 cell (serving cell) to a PCI#3 cell (additional cell) (overlapping with the serving cell). In this case, Rel. 17 does not support L1 / L2 switching of serving cells.

[0016] An additional cell is a cell that has an additional PCI that is different from the PCI of the serving cell. UEs can receive and transmit UE-dedicated channels (UE-dedicated CH) from additional cells. On the other hand, UEs need to be within the coverage of the serving cell in order to receive UE common channels (e.g., system information / paging / short messages). If a UE moves outside the coverage of the serving cell, a cell switchover (also called L3 mobility) is required (e.g., RRC reconfiguration).

[0017] <Scenario 2> In Scenario 2, L1 / L2 inter-cell mobility (e.g., L1L2-triggered mobility (LTM)) is applied. With L1 / L2 inter-cell mobility, serving cell changes can be made using functions such as beam control without performing RRC reconfiguration. In other words, transmission and reception with candidate cells / additional cells are possible without handover. Since handover requires RRC reconnection and other factors, resulting in a period of no data communication, applying L1 / L2 inter-cell mobility that does not require handover allows data communication to continue even when the serving cell is changed. Scenario 2 may be applied, for example, in Rel. 18. In Scenario 2, for example, the following procedure is performed.

[0018] (1) The UE receives configuration information (e.g., SSB settings) from the current serving cell regarding cells with different PCIs (additional cells / candidate cells / target serving cells) for beam measurement / serving cell changes. (2) The UE performs beam measurements on cells using different PCIs and reports the measurement results to the serving cell. (3) The UE may receive the configuration of cells with different PCIs (serving cell / candidate cell configurations) via upper-layer signaling (e.g., RRC). In other words, pre-configuration regarding serving cell changes may be performed. This configuration may be performed together with the configuration in (1) or separately. (4) Based on the above report, the TCI status of cells with different PCIs may be activated by L1 / L2 signaling in accordance with the serving cell change. The activation of the TCI status and the serving cell change may be performed separately. (5) The UE changes the serving cell (or assumed serving cell) and starts receiving / transmitting using the pre-configured individual UE channel and TCI state.

[0019] In other words, in Scenario 2, the serving cell (the assumed serving cell in the UE) is updated by L1 / L2 signaling. Scenario 2 may also be applied in Rel. 18.

[0020] Figure 1B shows an example of UE movement in Rel. 18. In Rel. 18, serving cells are switched by L1 / L2 (e.g., DCI / MAC CE). Here, we show a case where L1 / L2 signaling switches from PCI#1, which corresponds to the current serving cell (e.g., Current serving cell), to PCI#3, which corresponds to the candidate cell (e.g., Target serving cell).

[0021] The UE can receive and transmit common channels (e.g., system information / paging / short messages) and UE-only channels to and from the new serving cell (target serving cell #3). This allows the UE to be excluded from the coverage of the previous serving cell PCI #1.

[0022] (L1-L2-triggered mobility (LTM) in Rel. 18) Figure 2 shows an example of LTM being considered in Rel. 18. Here, the LTM operation is shown in the 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), but the steps of LTM are not limited to these. Some steps (or actions included in the steps) may be omitted, the order of actions included in some steps and other actions included in other steps may be swapped, and other steps (or other actions) may be added. In this 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 begins preparing one or more candidate cells.

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

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

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

[0027] 4b: When requested from the network, the UE performs early TA acquisition with one or more candidate cells before receiving a cell switch command. This is triggered via CFRA by a PDCCH order from the source cell. The UE then sends a preamble to the designated candidate cell. To minimize data interruption to the source cell by Contention Free Random Access (CFRA) to the candidate cell, the UE does not receive RARs intended for acquiring the TA value. 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 the TA based on the network implementation.

[0028] <LTM execution> 5: The UE performs the L1 measurement set for the candidate cell and sends the L1 measurement report for gNB. The L1 measurement is performed insofar as the RRC rearrangement in step 2 is applied.

[0029] 6. The gNB decides to perform a cell switch to the target cell and sends a MAC CE (Cell Switch Command) to trigger the cell switch. The MAC CE includes candidate settings for the target cell's index. The UE switches to the target cell and applies the settings 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 on the target cell.

[0031] <LTM Completion> 8: The UE completes the LTM cell switch procedure by sending an RRC reconfiguration completion message. The UE performs the RA procedure in step 7, and if the random access procedure completes successfully, it considers the LTM execution to be successfully completed. In a RACH-less LTM, the UE considers the LTM execution to be successfully completed if it determines that the network has successfully received the first UL data. The UE determines the success of the first UL data reception 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] (ReportConfigNR) The ReportConfigNR, an information element of RRC, defines the trigger criteria for NR measurement report events, CHO, Conditional PSCell Addition (CPA), Conditional PSCell Change (CPC) events, or Layer 2 UE-to-Network (L2U2N) relay measurement report events. For events labeled AN (N is 1 or 2) as shown below, the measurement report events and CHO, CPA, and CPC events are based on the measurement results of cells derived based on the SS / PBCH block or CSI-RS. Note that serving, adjacent, and PCell / PSCell may be interpreted as the measurement results of the serving cell, adjacent cell, and PCell / PSCell (L1-RSRP / L1-SINR, etc.).

[0033] Event A1: Serving is better than the absolute threshold. Event A2: Serving is worse than the absolute threshold. Event A3: The adjacent cell has a better offset than PCell / PSCell. Event A4: The adjacent cell is better than the absolute threshold. Event A5: PCell / PSCell is worse than absolute threshold 1, and the adjacent cell / SCell is better than another absolute threshold 2. Event A6: The adjacent cell has a larger offset than SCell.

[0034] Event D1: The distance between the UE and the reference location (referenceLocation1) becomes greater than the set threshold (distanceThreshFromReference1), and the distance between the UE and the reference location (referenceLocation2) becomes shorter than the set threshold (distanceThreshFromReference2). Conditional Event A3: The conditional reset candidate has a better offset amount than PCell / PSCell. Conditional Event A4: The conditional reset candidate is better than the absolute threshold. Conditional Event A5: PCell / PSCell is worse than absolute threshold 1, and the conditional reset candidate is better than another absolute threshold 2. Conditional Event D1: The distance between the UE and the reference location (referenceLocation1) becomes greater than the set threshold (distanceThreshFromReference1), and the distance between the UE and the reference location (referenceLocation2) of the conditional reconstruction candidate becomes shorter than the set threshold (distanceThreshFromReference2).

[0035] Conditional Event T1: The time measured by the UE exceeds the set threshold t1-Threshold but is less than t1-Threshold+duration. Event X1: The UE of the serving L2U2N relay becomes worse than absolute threshold 1, and the NR cell becomes better than another absolute threshold 2. Event X2: The UE of the serving L2U2N relay becomes worse than the absolute threshold. For Event I1, the measurement report event is based on the Cross Link Interference (CLI) measurement result, which is derived based on SRS-RSRP or CLI-RSSI. Event I1: Interference becomes higher than the absolute threshold.

[0036] (Conditional Handover (CHO)) Conditional Handover (CHO) from Rel. 16 onwards is described below. CHO is applied, for example, to 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.

[0037] Time-based or location-based trigger conditions are always set in conjunction with one of the measurement-based trigger conditions (CHO events A3 / A4 / A5 described below). How the UE evaluates time-based or location-based trigger conditions together with RRM measurement-based events depends on the UE implementation.

[0038] (Rel. 18 LTM and Rel. 16 CHO) Early sync / early L1 measurement report is supported in the above-mentioned LTM (e.g., Rel. 18 LTM), but early sync / early measurement report is not supported in CHO (e.g., Rel. 16 CHO). 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).

[0039] In LTM, a MAC CE for cell switch commands is transmitted from the base station to the UE. In CHO, after the UE receives the CHO configuration via RRC signaling, it begins evaluating the conditions for implementing CHO for the candidate cell. After determining mobility (or cell switch), RACH is required in CHO, but may not be required in LTM.

[0040] (Conditional LTM) RRC signaling / MAC CE may set execution conditions for each candidate cell in the UE. The UE may evaluate whether each candidate cell satisfies the execution conditions and switch the serving cell to the candidate cell that satisfies the conditions. This operation may be called conditional LTM (CLTM). Since the UE can perform cell switching even without receiving a cell switch command MAC CE from the NW, such as the LTM in Rel. 18 above, high-speed cell switching can be achieved.

[0041] This section describes examples of providing / signaling / evaluating execution conditions (e.g., execution conditions) for candidate cells when CLTM is supported.

[0042] The implementation conditions (or, may simply be called "conditions") may include at least one of the following: event, reference signal type (RS type), reference signal configuration (RS configuration), and measurement quantity. The reference signal type (RS type) may indicate SSB / CSI-RS. The measurement quantity may indicate L1-RSRP / L3-RSRP / SINR / RSRQ.

[0043] The execution conditions may be set separately for each candidate cell (for example, different conditions may be supported). Alternatively, the execution conditions may be set in common for multiple candidate cells (for example, a group of candidate cells) or for all candidate cells. Alternatively, some of the execution conditions may be set in common for each candidate cell, while the rest are set separately. Some of the execution conditions may be events, and the rest may be condition values, etc. Of course, this is not limited to these.

[0044] The number of candidate cells for which implementation conditions are provided may be defined in advance in the specification, may be set from the network (e.g., base station) to the UE, or may be determined based on the UE capabilities. For example, the number of cells for which implementation conditions are provided may be the same as the set candidate cells, or may be less than the entire set of candidate cells.

[0045] The setting for the implementation conditions (e.g., detailed setting) may be the same as the condition setting of the existing system. The condition setting of the existing system may be, for example, the condition setting supported by CHO supported in Rel. 16 (e.g., the condition setting based on L3 measurement).

[0046] Alternatively, the settings for the implementation conditions may apply a new condition setting similar to the L1 report by event trigger (e.g., event triggered L1 report). An example of the condition (or event) is shown below. Event A2: The measurement result of the serving cell is worse than the threshold. Event A3: The measurement result of the neighboring cell (the value obtained by adding an offset to the measurement result) is better than the measurement result of the SpCell (the value obtained by adding an offset to the measurement result). Event A4: The measurement result of the neighboring cell (the value obtained by adding an offset to the measurement result) is better than the threshold. Event A5: The measurement result of the SpCell is worse than the first threshold, and the measurement result of the neighboring cell (the 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 (the value obtained by adding an offset to the measurement result) is better than the measurement result of the serving cell (Secondary Cell (SCell)) (the value obtained by adding an offset to the measurement result). Event I1: The measurement result of the interference 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 value, total value, etc.) of the measurement results of a plurality of beams (e.g., the best X beams) is better than the threshold. X may be fixed or may be set by upper layer signaling or the like. Event A4''': The L1-RSRP measurement result of one beam from the 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.

[0047] Note that the applicable conditions / events are not limited to this, and the above multiple events may be combined and applied, or other events may be applied.

[0048] <Cell Switching Processing Procedure in CLTM>Regarding the processing procedure of CLTM (e.g., CLTM between Central Units (CUs)), at least one of the following may be applied.

[0049] <<Option 1a>> Figure 3 shows the CLTM procedure in Option 1a. First, the NW determines potential candidate cells / beams (e.g., selects 3 from 8 candidate cells) using a conventional L3 measurement report or a conventional LTM L1 measurement report, and reserves the resources of the candidate cells. The source cell notifies the UE of information indicating the selected potential cell / beam (e.g., potential RS index). The UE then begins evaluating the potential cell / beam based on the implementation conditions. If the implementation conditions are met for a particular candidate cell / beam, the UE performs a cell switch to that candidate cell / beam using the UL cell switch command (CSC) without a MAC CE.

[0050] <<Option 1b>> Figure 4 shows the CLTM procedure in Option 1b. First, the NW determines potential candidate cells / beams using a conventional L3 measurement report or an event-triggered measurement report (e.g., selecting 3 from N candidate cells) and reserves the resources of the candidate cells. The UE is notified of the information indicating the selected potential cells / beams (e.g., potential RS index). The UE then begins evaluating the potential cells / beams based on the implementation conditions. If the implementation conditions are met for a particular candidate cell / beam, the UE performs a cell switch to that candidate cell / beam without UL CSC MAC CE.

[0051] <<Option 1c>> Figure 5 shows the CLTM procedure in Option 1c. First, the UE performs an event trigger measurement report. This report includes a report of N potential candidate cells / beams. The source cell selects a portion (X) of the N candidate cells and reserves resources for X candidate cells / beams. The UE then begins evaluating the potential cells / beams based on the implementation conditions. If the implementation conditions are met for a particular candidate cell / beam, the UE performs a cell switch to that candidate cell / beam without UL CSC MAC CE.

[0052] <<Option 2>> Figure 6 shows the CLTM procedure in Option 2. First, the UE transmits UL signaling (e.g., extended UE assist information, including TCI status) and determines potential candidate cells / beams based on that information (e.g., some of the eight potentials (3) are selected). This selection may also be made on the source cell side. The source cell reserves the resources of the selected candidate cells. The UE then begins evaluating potential cells / beams based on the implementation conditions. If the implementation conditions are met for a particular candidate cell / beam, the UE performs a cell switch to that candidate cell / beam without UL CSC MAC CE.

[0053] <<Option 3>> Figure 7 shows the CLTM procedure in Option 3. The UE performs a cell switch to a specific candidate cell / beam if the implementation conditions are met for that candidate cell / beam. The UE transmits the UL CSC MAC CE (e.g., the TCI status or RS ID corresponding to the determined candidate cell / beam) to the NW.

[0054] (Analysis) As mentioned above, it is also anticipated that future wireless communication systems (e.g., Rel. 19 and later) will support conditional cell switches (also called conditional LTMs (CLTMs)). For example, an LTM procedure could be triggered by a UE based on conditions set from the network.

[0055] However, even if CLTM is supported, it is unclear how to control its specific operation / procedures. This could lead to a decrease in communication throughput due to the inability to achieve proper cell switching. For example, the following issues may arise:

[0056] For example, as mentioned above, five options are being considered for the CLTM procedure. For example, at least for option 1c, it is necessary to consider the relationship between the number of candidate cells / beams in the report and the number of candidate cells / beams that are notified in order to secure resources within those candidate cells. Not all beams / candidate cells recorded in the report may be suitable as candidate cells / beams that may be monitored / evaluated / reserved. Therefore, it is conceivable to define appropriate rules when some candidate cells / beams are selected.

[0057] Therefore, the inventors conceived a method for properly performing cell switching when CLTM is supported.

[0058] The embodiments of this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination.

[0059] (Various substitutions) In this disclosure, words enclosed in parentheses () may indicate an explanation of the preceding word (e.g., an explanation of spelling), a paraphrase, a specific example, or supplementary explanation. Also, in this disclosure, words enclosed in square brackets [] may be interpreted as part of the overall meaning of the text, or they may be interpreted as being excluded (ignored). Note that parentheses () and square brackets [] may be used for purposes / meanings other than those described above.

[0060] In this disclosure, "A / B" and "at least one of A and B" may be interpreted as mutually exclusive. In this disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0061] In this disclosure, terms such as notice, activate, deactivate, indicate (or specify), select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and capable of operating may be interpreted interchangeably.

[0062] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, fields, Information Elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Elements (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0063] In this disclosure, the upper layer signaling may be any or a combination thereof, such as Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and other messages (e.g., messages from the core network, such as positioning protocol messages (e.g., NR Positioning Protocol A (NRPPPa) / LTE Positioning Protocol (LPP)) messages).

[0064] In this disclosure, MAC signaling may include, for example, MAC Control Elements (MAC CEs) and MAC Protocol Data Units (PDUs). Broadcast information may include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), and Other System Information (OSIs).

[0065] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0066] In this disclosure, base station, gNB, network (NW), source gNB, target gNB, and source cell may be interpreted as interchangeable.

[0067] In this disclosure, cell group, serving cell group, master cell group (MCG), and secondary cell group (SCG) may be interpreted interchangeably. L1 / L2, L1 / L2 signaling, and DCI / MAC CE may be interpreted interchangeably. A serving cell may be replaced with a cell that transmits PDSCH. A candidate cell may mean a cell that is a candidate to become a serving cell through L1 / L2 inter-cell mobility. L1 / L2-triggered mobility (LTM) and L1 / L2 inter-cell mobility may be interpreted interchangeably.

[0068] In this disclosure, cell, PCI, serving cell, source serving cell, source cell, CC, BWP, BWP within CC, and band may be interpreted as equivalent to each other. In this disclosure, 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 current serving cell's PCI, another serving cell, and target cell may be interpreted as equivalent to each other. A target cell may be a cell selected from among several candidate cells. In this disclosure, cell, base station (gNB) within a cell, base station (gNB) of a cell, and base station (gNB) may be interpreted as equivalent to each other.

[0069] In this disclosure, the terms "event," "conditions for the event," and "implementation conditions" may be interpreted interchangeably. The terms "conditions for the event" and "implementation conditions" may also mean conditions for cell switching. The terms "candidate cell," "target cell," and "base station / gNB of the candidate cell / target cell" may be interpreted interchangeably. In this disclosure, "cell switch" may mean a switch of a serving cell (a switch to a candidate cell / target cell that satisfies the implementation conditions).

[0070] Event trigger beam reports, event trigger reports, beam reports, and CSI reports may be interpreted as interchangeable. An event trigger beam report may also be an L1 / L3 beam report. An event trigger beam report may be a report sent when the conditions for the event set by the above reporting configuration (ReportConfigNR), or the conditions / events for the above-mentioned conditional LTM (CLTM), are met. The base station may make decisions regarding the LTM based on the event trigger beam report. Beam reports / reports and CSI reports may be interpreted as interchangeable.

[0071] In this disclosure, being evaluated based on the conditions of implementation may also mean determining / evaluating whether the conditions of implementation are met.

[0072] (Wireless communication method) Each embodiment is based on the CLTM procedure in option 1c (Figure 5) described above. However, each embodiment may be based on other CLTM procedures, or a combination of multiple CLTM procedures may be applied.

[0073] The UE may send an event-triggered beam report for CLTM, evaluate whether the candidate cells / beams meet the conditions for implementing CLTM, and perform a serving cell switch (cell switch) using the candidate cells / beams that meet the conditions. The number of candidate cells / beams included in this beam report and the number of candidate cells / beams to be evaluated will be explained in the first embodiment described below.

[0074] <Embodiment 0> The UE sends an event-triggered beam report (MAC CE) for the CLTM. For the number of candidate cells / beams in this beam report (e.g., N of option 1c above), one of the following options applies. The maximum number of beams in a single report instance (e.g., N) may be set by the NW.

[0075] <<Candidate Cells / Beams in Event-Triggered Beam Reports>> Option 1-1: The UE may receive the setting of the maximum number of candidate cells in a single report instance (e.g., L) and the maximum number of beams per candidate cell (e.g., M) via upper-layer signaling / physical-layer signaling. The UE may determine the actual number of candidate cells in a single report instance (e.g., L') and the actual number of beams per candidate cell (e.g., M') based on whether the beams meet the conditions. The UE / NW may determine N according to the following formula: N = L × M >= L' × M'

[0076] Option 1-2: The UE may receive the maximum number of candidate cells in a single report instance (e.g., L) and the maximum number of beams per candidate cell (e.g., M') via upper-layer signaling / physical-layer signaling. The UE may determine the actual number of candidate cells in a single report instance (e.g., L') based on whether the beams meet the criteria. The UE / NW may determine N according to the following formula: N = L × M' >= L' × M'

[0077] Option 1-3: The maximum number of candidate cells (e.g., L) and the maximum number of beams per candidate cell (e.g., M) in a single report instance do not need to be set by NW. UE determines the actual number of candidate cells (e.g., L') or beams (e.g., N') based on whether the beams meet the conditions. UE may determine L' or N' according to the following formula, in which case the number of beams for each candidate cell may differ: 0 < L' < N' + 1

[0078] Variations: The above L, M, L', and M' may be defined by the specifications or determined by the capabilities of the UE.

[0079] Variation: Based on the UE capability information report, candidate cells / beams of the same / different frequencies may be configured individually.

[0080] <<Number of candidate cells / beams to be evaluated>> The following options may apply to the number of candidate cells / beams to be evaluated [simultaneously] based on the implementation conditions.

[0081] Option 2-1: The UE may send UE capability information indicating the maximum number of candidate cells (e.g., L''), and the maximum number of candidate cells may be set based on the UE capability information.

[0082] Option 2-2: The UE may transmit UE capability information indicating the maximum number of beams (e.g., N''), and the maximum number of beams may be set based on the UE capability information.

[0083] Option 2-3: The UE may transmit UE capability information indicating the maximum number of beams per candidate cell (e.g., M''), and the maximum number of beams per candidate cell may be set based on the UE capability information.

[0084] Variation: The UE may transmit UE capability information regarding candidate cells / beams of the same / different frequencies, and based on the UE capability information, candidate cells / beams of the same / different frequencies may be configured individually.

[0085] The UE may determine the actual number of candidate cells / beams to be evaluated [simultaneously] based on the implementation conditions by the number of candidate cells / beams reported / instructed, or by the number of candidate cells / beams that meet the conditions for evaluating the implementation conditions (e.g., event-triggered beam reporting).

[0086] The number of candidate cells / beams evaluated [simultaneously] based on the implementation conditions may be 1 by default.

[0087] The number of candidate cells / beams evaluated [simultaneously] based on the implementation conditions may be the same as the [maximum] number of potential candidate cells / beams maintained / preserved by the UE.

[0088] The rules for the number of candidate cells / beams and the number of candidate cells / beams to be evaluated in the event-triggered beam report of this embodiment may be shared between the UE and the NW (e.g., the source cell). This allows the resources of candidate cells / beams reserved by the source cell (e.g., X in Figure 5) to match the number of candidate cells / beams to be evaluated.

[0089] According to this embodiment, appropriate cell switching can be performed by clearly defining the rules for the number of candidate cells / beams in the event-triggered beam report and the number of candidate cells / beams to be evaluated.

[0090] <First Embodiment> The following options may be applied to the relationship between the number of candidate cells / beams in the event trigger beam report and the number of candidate cells / beams evaluated [simultaneously] based on the implementation conditions.

[0091] Option 1-1: The same value is always assumed / set.

[0092] Option 1-2: Different values ​​are set. For example, the [Maximum] number of candidate cells / beams in an event-triggered beam report may be greater than the [Maximum] number of candidate cells / beams evaluated [simultaneously] based on the implementation conditions.

[0093] Regarding the determination of candidate cells / beams to be evaluated based on the execution conditions, if Option 1-1 is applied, the UE will initiate evaluation based on the execution conditions for all reported candidate cells / beams.

[0094] If options 1-2 are applied, some rule or requirement in the report is necessary to determine the candidate cells / beams to be evaluated. For example, at least one of the following rules or requirements may be applied:

[0095] Option 2-1: The UE will begin evaluation based on the operating conditions, prioritizing N'' high-quality beams (e.g., those with high L1-RSRP / SINR) from among the beams included in the beam report. N'' may be set by RRC signaling, defined in the specifications, or determined based on the UE's capabilities. By default, N'' is 1.

[0096] Option 2-2: The UE may begin the evaluation of implementation conditions by prioritizing L'' candidate cells with high quality (e.g., large L1-RSRP / SINR) among the beams included in the beam report. For example, the evaluation may begin based on implementation conditions, prioritizing the beam with the highest L1-RSRP / SINR among the candidate cells.

[0097] Alternatively, in option 2-2, if, for example, the maximum number of beams to evaluate N'' is set as N'' > L'', then first the beam with the largest L1-RSRP / SINR is selected from the candidate cells, and then N''-L'' beams with a larger L1-RSRP / SINR are selected from all beams. L'' may be set by RRC signaling, defined in the specification, or determined based on the capabilities of the UE. By default, L'' is 1.

[0098] The request for a report to determine the candidate cells / beams to be evaluated may be at least one of the following options:

[0099] Option 2-3: Include a 1-bit indication per beam / cell in the report. For example, a bit value of 1 means it is being evaluated, and a bit value of 0 means it is not being evaluated.

[0100] Option 2-4: Include a single 1-bit instruction in the report. For example, a 1-bit value of 1 means to include the beam / cell under evaluation, and a 1-bit value of 0 means to exclude the beam / cell under evaluation. If the beam / cell under evaluation is to be included, the UE may use Options 2-1 / 2-2 to select the actual beam / cell to be evaluated.

[0101] Variations of Option 2-4: An Event ID / CSI Report Setting ID may be used instead of the 1-bit instruction for Option 2-4.

[0102] Any combination of the above options 2-1 to 2-4 may be applied.

[0103] When a candidate cell / beam for evaluation is selected by a UL signal (UE-initiated (UEI), event-triggered beam report, etc.), the NW (source cell / distributed unit (DU) / central unit (CU)) notifies the corresponding candidate cell (DU / CU) of the beam to be evaluated as a potential beam / cell. This allows the UE to switch the candidate cell / beam to secure UL resources (CG-PUSCH, RACH resources, etc.) on the candidate cell. This UL signaling may include the same information as the cell switch command MAC CE in Rel. 18 LTM (e.g., at least one of TCI status ID, TA command, random preamble index, SS / PBCH index, and PRACH mask index).

[0104] The evaluation will begin after a certain period of time (X ms / symbol / slot, etc.) has elapsed since the transmission of the beam report or the receipt of an ACK for the beam report.

[0105] According to this embodiment, candidate cells / beams to be evaluated can be appropriately determined.

[0106] <Supplement> <<Notification of Information to UE>> In the embodiments described above, notification of any information from the Network (NW) (e.g., Base Station (BS)) to the UE (in other words, reception of any information from the BS at the UE) may be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0107] If the above notification is made by a MAC CE, the MAC CE may be identified by the inclusion of a new Logical Channel ID (LCID) not defined in existing standards in the MAC subheader.

[0108] If the above notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble the Cyclic Redundancy Check (CRC) bits assigned to the DCI, or the format of the DCI.

[0109] Furthermore, notification of any information to the UE in the above-described embodiment may be periodic, semi-persistent (triggered by instructions from the UE or gNB), or aperiodic (triggered by instructions from the UE or gNB).

[0110] In the embodiments described above, the UE may receive information from the NW as at least one of the following QCL rules: • QCL type A. • QCL type B. • QCL type C. • QCL type D.

[0111] In the embodiments described above, the QCL source RS for each QCL type may be at least one of the following RSs: • SSB; • CSI-RS with / without repetition; • TRS; • DMRS for PDCCH / PDSCH.

[0112] In the embodiments described above, information from the network may be set / instructed by the following methods: - Common to multiple UEs, or individual to a UE. - Cell-specific, or common to multiple cells. - Per UE / Per CC / Per BWP / Per band / Per cell / Per cell group (CG).

[0113] <<Notification of Information from UE>> Notification of any information from the UE to the NW in the embodiments described above (in other words, transmission / reporting of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination thereof.

[0114] If the above notification is made by a MAC CE, the MAC CE may be identified by the inclusion of a new LCID not specified in existing standards in the MAC subheader.

[0115] If the above notice is made by the UCI, the notice may be transmitted using PUCCH or PUSCH.

[0116] Furthermore, the notification of any information from the UE in the above-described embodiment may be periodic, semi-persistent (triggered by instructions from the UE or gNB), or aperiodic (triggered by instructions from the UE or gNB).

[0117] <<Regarding the application of each embodiment>> In UE / BS, specific (one or more) processes / operations / controls / assumptions / information for at least one of the embodiments described above may be applied (or used) if any or more of the following conditions are met: - A higher-layer parameter indicating the specific process / operation / control / assumption / information is set; - The specific process / operation / control / assumption / information is determined based on the relevant higher-layer parameter; - The specific process / operation / control / assumption / information is designated / activated / triggered by MAC CE / DCI / UCI / Resource / Channel / RS; - A specific UE capability indicating (or related to) the specific process / operation / control / assumption / information is reported or supported; - The application of the specific process / operation / control / assumption / information is determined based on specific conditions.

[0118] The above-mentioned specific UE capabilities may include at least one of the following: supporting the above-mentioned specific processing / operation / control / assumment / information; supporting the application of CLTM; supporting event-triggered beam reporting in LTM; supporting the setting of implementation conditions for each candidate cell / beam; and supporting RACH-less procedures in CLTM.

[0119] In this disclosure, "to support" and "whether or not to support" may be interpreted interchangeably.

[0120] Furthermore, the UE capabilities described in the above-mentioned specific UE capabilities and embodiments may be capabilities that apply across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., one or a combination thereof, such as cell, band, band combination, BWP, component carrier, etc.), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), capabilities per subcarrier spacing (SCS), or capabilities per feature set (FS) or feature set per component-carrier (FSPC).

[0121] Furthermore, the UE capabilities described in the above-mentioned specific UE capabilities and embodiments may be capabilities that apply across all duplexing schemes (common to all duplexing schemes regardless of the duplexing scheme), or they may be capabilities specific to each duplexing scheme (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0122] If the above conditions are not met, UE / BS may follow the behavior specified in existing 3GPP releases.

[0123] (Note) The following inventions are added with respect to one embodiment of the present disclosure. [Note 1] A terminal having: a transmitting unit that transmits an event trigger beam report for Conditional L1L2-triggered mobility (CLTM); and a control unit that evaluates whether candidate cells and beams satisfy the conditions for implementing the CLTM and switches serving cells using candidate cells and beams that satisfy the conditions. [Note 2] The terminal according to Note 1, which receives the setting of the maximum number of candidate cells and the setting of the maximum number of beams per candidate cell in the event trigger beam report. [Note 3] The terminal according to Note 1 or Note 2, which further has a transmitting unit that transmits capability information indicating the number of candidate cells to be evaluated and the number of beams to be evaluated. [Note 4] The terminal according to any one of Notes 1 to 3, wherein the control unit preferentially evaluates high-quality candidate cells and beams from among the candidate cells and beams included in the beam report.

[0124] (Wireless Communication System) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any of the wireless communication methods according to the above embodiments of this disclosure, or a combination thereof.

[0125] Figure 8 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 (which may also be simply called system 1) may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0126] Furthermore, the wireless communication system 1 may 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)), and the like.

[0127] 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.

[0128] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0129] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement, number, shape, size, etc., of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0130] 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 by multiple antennas / base stations 10. One [virtual] cell (which may be called a supercell, for example) may be composed of multiple [virtual] cells (which may be called subcells, for example). A supercell may correspond to a cell with a fixed physical range, and a subcell may correspond to a cell whose physical range fluctuates quasi-statically / dynamically. In this case, the wireless communication system 1 may be called a cell-free system.

[0131] 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).

[0132] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a 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. Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be in a frequency band higher than FR2.

[0133] Furthermore, the user terminal 20 may communicate in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0134] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 / Xn interface, etc.) or wireless (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0135] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0136] The core network 30 may include network functions (NF) such as User Plane Function (UPF), Access and Mobility Management Function (AMF), Session Management Function (SMF), Unified Data Management (UDM), Application Function (AF), Data Network (DN), Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). Multiple functions may be provided by a single network node. Furthermore, communication with an external network (e.g., the Internet) may occur via the DN.

[0137] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0138] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. 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-OFDM), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0139] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0140] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, which is shared by each user terminal 20.

[0141] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0142] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0143] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0144] Furthermore, the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc., and the DCI that schedules PUSCH may be called UL grant, UL DCI, etc. Furthermore, PDSCH may be read as DL data, and PUSCH may be read as UL data.

[0145] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. A UE may monitor CORESETs associated with a given search space based on the search space configuration.

[0146] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0147] PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgment information (for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0148] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted from the names of various channels.

[0149] 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, the DL-RS may include 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.

[0150] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.

[0151] Furthermore, in the wireless communication system 1, the uplink reference signal (UL-RS) may include a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. The DMRS may also be called a user-specific reference signal (UE-specific Reference Signal).

[0152] (Base Station) Figure 9 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmitting / receiving unit 120, the transmitting / receiving antenna 130, and the transmission line interface 140 may be provided.

[0153] In this example, the functional blocks of the characteristic parts of this 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 part described below may be omitted.

[0154] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0155] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 120, transmitting / receiving antenna 130, and transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of wireless resources, etc.

[0156] The transmitting / receiving 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 transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0157] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0158] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0159] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0160] The transmitting / receiving unit 120 may use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like to form at least one of the transmitting beam and the receiving beam.

[0161] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), and the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), to generate a bit sequence to be transmitted.

[0162] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0163] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0164] 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 130.

[0165] The transmitting / receiving unit 120 (receiving 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 (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.

[0166] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to 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 also measure received power (e.g., Reference Signal Received Power (RSRP)), reception 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.

[0167] The transmission path interface 140 may send and receive signals (backhaul signaling) with devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0168] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0169] 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 implement RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level physical layer functions (precoding, IFFT, FFT, etc.). The DU may implement higher-level physical layer functions (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may implement PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer functions.

[0170] In this disclosure, base station 10 may include a single device that implements all the functions of RU, DU, and CU, or it may include multiple devices that each implement some of the functions of RU, DU, and CU and are connected to each other. In this disclosure, base station 10 may be interpreted as RU / DU / CU.

[0171] The transmitting / receiving unit 120 may receive event trigger beam reports for Conditional L1L2-triggered mobility (CLTM).

[0172] The control unit 110 may evaluate whether the candidate cells and beams satisfy the conditions for implementing CLTM, and reserve the resources of the candidate cells / beams assuming that the serving cell switch will be performed using the candidate cells and beams that satisfy the conditions.

[0173] (User Terminal) Figure 10 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0174] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, 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 part described below may be omitted.

[0175] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0176] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0177] The transmitting / receiving 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 transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0178] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0179] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0180] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0181] The transmitting / receiving unit 220 may use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like to form at least one of the transmitting beam and the receiving beam.

[0182] The transmitting / receiving unit 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 and control information acquired from the control unit 210 to generate a bit sequence to be transmitted.

[0183] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0184] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0185] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0186] 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.

[0187] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (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.

[0188] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also 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.

[0189] The measurement unit 223 may derive channel measurements for CSI calculation based on channel measurement resources. 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 interference measurement resources. Interference measurement resources may be at least one of the following: NZP CSI-RS resources for interference measurement, CSI-Interference Measurement (IM) resources, etc. CSI-IM may also be called CSI-Interference Management (IM), and may be interpreted interchangeably with Zero Power (ZP) CSI-RS. In this disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc., may be interpreted interchangeably.

[0190] In this disclosure, the transmitting unit and receiving unit of the user terminal 20 may be composed of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0191] The transmitting / receiving unit 220 may perform at least some of the processing of the transmitting / receiving unit described in the appendix above.

[0192] The control unit 210 may perform at least some of the processing of the control unit described in the appendix above.

[0193] (Hardware Configuration) The block diagram used in the description of the above embodiment shows functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0194] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0195] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 11 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0196] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0197] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, the processing may be performed by one processor, or it may be performed by two or more processors simultaneously, sequentially, or by other means. Note that the processor 1001 may be implemented using one or more chips.

[0198] 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 the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or control at least one of reading and writing data in the memory 1002 and storage 1003.

[0199] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0200] Furthermore, the processor 1001 reads programs (program code), 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 accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0201] The memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be called a register, cache, or main memory. The memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of the present disclosure.

[0202] The storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a Compact Disk (Compact Disc ROM (CD-ROM)), a Digital Use Disk, a Blu-ray (registered trademark) disk), 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. The storage 1003 may also be called an auxiliary storage device.

[0203] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated transmitting unit 120a (220a) and receiving unit 120b (220b).

[0204] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0205] 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 different buses may be configured for each device.

[0206] 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), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0207] Furthermore, devices included in the core network 30 (for example, network nodes that provide NF) may also be implemented using the functional block / hardware configuration described above.

[0208] (Variations) Terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0209] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist 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.

[0210] Here, the neurology may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neurology may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0211] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0212] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using minislots may be called a PDSCH (PUSCH) mapping type B.

[0213] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0214] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, and one slot or one mini-slot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe in existing LTE (1 ms), a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing a TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0215] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0216] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the actual time interval (e.g., number of symbols) in which the transport block, code block, code word, etc. are mapped may be shorter than the TTI.

[0217] Furthermore, if one slot or one mini-slot is referred to as a TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit for scheduling. In addition, the number of slots (number of mini-slots) that constitute this minimum time unit for scheduling may be controlled.

[0218] A TTI with a time length of 1 ms may be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0219] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0220] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0221] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0222] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0223] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0224] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. These common RBs may be identified by an index of the RBs relative to a common reference point of the carrier. The PRBs may be defined and numbered within a given BWP.

[0225] A BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). One or more BWPs may be configured within a single carrier for a UE.

[0226] At least one of the configured BWPs may be active, and the UE does not need to assume that it will transmit or receive a predetermined signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0227] The structures of wireless frames, subframes, slots, minislots, and symbols described above are merely examples. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless 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, and the number of symbols, symbol length, and cyclic prefix (CP) length within the TTI can be varied in various ways.

[0228] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0229] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements using these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0230] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0231] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0232] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0233] Any information described in this disclosure (e.g., variables, constants, parameters) may be communicated from any first device (e.g., UE / base station) to any second device (e.g., base station / UE) that indicates / specifies (or relates to) the value of such any information, even if not specifically stated in the embodiments described above.

[0234] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0235] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Elements (CEs).

[0236] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not notifying the specified information or by notifying other information).

[0237] The determination may be made by a value represented by one bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0238] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0239] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0240] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0241] In this 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,” and “receiving entity” may be used interchangeably.

[0242] In this disclosure, "antenna port" may be interpreted interchangeably with "antenna port for any signal / channel" (e.g., a Demodulation Reference Signal (DMRS) port). In this disclosure, "resource" may be interpreted interchangeably with "resource for any signal / channel" (e.g., a reference signal resource, an SRS resource, etc.). Resources may include time / frequency / code / spatial / power resources. Furthermore, a spatial domain transmit filter may include at least one of a spatial domain transmit filter and a spatial domain receive filter.

[0243] The above group may include, for example, at least one of the following: 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, or a panel group.

[0244] Furthermore, in this disclosure, terms such as beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, Codeword (CW), Transport Block (TB), and RS may be interpreted interchangeably.

[0245] Furthermore, in this disclosure, 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 interpreted interchangeably.

[0246] Furthermore, in this disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) properties," and "specific QCL type (e.g., Type A, Type D)" may be interpreted interchangeably.

[0247] In this disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, subset may be interpreted interchangeably.

[0248] Furthermore, the spatial relationship information Identifier (ID) (TCI state ID) and spatial relationship information (TCI state) may be interpreted as mutually exclusive. "Spatial relationship information (TCI state)" may be interpreted as mutually exclusive as "a set of spatial relationship information (TCI state)," "one or more pieces of spatial relationship information," etc. TCI state and TCI may be interpreted as mutually exclusive. Spatial relationship information and spatial relationship may be interpreted as mutually exclusive.

[0249] In this disclosure, terms such as “Base Station (BS),” “wireless base station,” “fixed station,” “NodeB,” “eNB (eNodeB),” “gNB (gNodeB),” “access point,” “Transmission Point (TP),” “Reception Point (RP),” “Transmission / Reception Point (TRP),” “panel,” “cell,” “sector,” “cell group,” “carrier,” and “component carrier” may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0250] A base station may house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station may be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0251] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform a control / operation based on said information.

[0252] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0253] A mobile station may also be called 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 appropriate term.

[0254] 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. At least one of the base station and the mobile station may also be a device mounted on a moving object, the moving object itself, etc.

[0255] The term "mobile object" refers to any movable object, regardless of its speed, and naturally includes cases where the mobile object is stationary. Examples of such mobile objects include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and items carried on them. Furthermore, such mobile objects may be autonomously driven objects operating based on operational commands.

[0256] The mobile entity may be a vehicle (e.g., a car, an airplane), an unmanned mobile entity (e.g., a drone, an autonomous vehicle), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does 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.

[0257] Figure 12 shows an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a pneumatic 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.

[0258] The drive unit 41 consists of, for example, at least one of an engine, a motor, or an engine-motor hybrid. 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.

[0259] The electronic control unit 49 consists of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 installed in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0260] Signals from various sensors 50-58 include current signals from current sensor 50 for sensing motor current, rotational speed signals of front wheels 46 / rear wheels 47 acquired by rotational speed sensor 51, air pressure signals of front wheels 46 / rear wheels 47 acquired by air pressure sensor 52, vehicle speed signals acquired by vehicle speed sensor 53, acceleration signals acquired by acceleration sensor 54, accelerator pedal depression amount signals acquired by accelerator pedal sensor 55, brake pedal depression amount signals acquired by brake pedal sensor 56, operation signals of shift lever 45 acquired by shift lever sensor 57, and detection signals acquired by object detection sensor 58 for detecting obstacles, vehicles, pedestrians, etc.

[0261] The information service unit 59 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, display, television, and radio, and one or more ECUs that control these devices. The information service unit 59 uses information acquired from external devices via a communication module 60 or the like to provide various types of information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0262] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) or output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0263] The driver assistance system unit 64 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, 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 Unit (IMU), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driver assistance functions or autonomous driving functions.

[0264] 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 sends and receives data (information) via the communication port 63 to 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, axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40.

[0265] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Alternatively, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 (it may function as at least one of the base station 10 and the user terminal 20).

[0266] The communication module 60 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include the information based on the above input.

[0267] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 installed in the vehicle. The information service unit 59 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[0268] 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, axle 48, various sensors 50-58, etc., which are provided in the vehicle 40.

[0269] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this 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), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions of the base station 10 described above. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel, downlink channel, etc., may be interpreted as sidelink channel.

[0270] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0271] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes having base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0272] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between as needed during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements using exemplary order and are not limited to the specific order presented.

[0273] Each aspect / embodiment described in this disclosure is 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 (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, systems utilizing Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, and next-generation systems extended, modified, created, or defined based thereon may also be applied. Furthermore, multiple systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

[0274] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0275] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0276] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to mean judging, calculating, computing, processing, deriving, investigating, looking up, searching, or inquiring (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0277] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0278] Furthermore, “judgment (decision)” may be considered as “judgment (decision)” of resolving, selecting, choosing, establishing, comparing, etc. In other words, “judgment (decision)” may be considered as “judgment (decision)” of some action. In this disclosure, “judgment (decision)” may be interpreted as mutually interchangeable with the actions described above.

[0279] Furthermore, in this disclosure, “determine / determining” may be interpreted as “assume / assuming,” “expect / expecting,” or “consider / considering.” In addition, in this disclosure, “not expecting to do…” may be interpreted as “expecting not to do….”

[0280] In this disclosure, "expect" may be rephrased as "be expected." For example, "expect(s) ..." (where "..." may be expressed as a that clause, an infinitive, etc.) may be rephrased as "be expected ..." or "do (the verb without "to" if "..." is an infinitive)." Similarly, "does not expect ..." may be rephrased as "be not expected ..." or "do not (the verb without "to" if "..." is an infinitive)." Furthermore, "An apparatus A is not expected ..." may be rephrased 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).

[0281] The term "maximum transmit power" as used in this disclosure may mean the maximum transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0282] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0283] In this disclosure, when two elements are connected, they can be considered to be "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0284] In this 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 "combine" may be interpreted similarly to "different."

[0285] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0286] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0287] In this disclosure, "less than or equal to," "less than," "greater than or equal to," "more than," and "equal to" may be interpreted interchangeably. In addition, in this disclosure, words meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees. In addition, in this disclosure, words meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees, by adding "i-th" (where i is any integer) to the expression (for example, "highest" may be interpreted interchangeably with "i-th highest").

[0288] In this disclosure, "of," "for," "regarding," "related to," and "associated with" may be interpreted as being interchangeable.

[0289] In this disclosure, phrases 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. Furthermore, A, B, etc., may be replaced with appropriate expressions such as nouns, gerunds, or regular sentences depending on the context. The time difference between A and B may be approximately zero (immediately after or immediately before). Additionally, a time offset may be applied to the time when A occurs. For example, "A" may be interpreted as "before / after the time offset when A occurs". The time offset (e.g., one or more symbols / slots) may be predetermined or determined by the UE based on notified information.

[0290] In this disclosure, timing, time, duration, time instance, any unit of time (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc., may be interpreted interchangeably.

[0291] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The descriptions herein are illustrative and not intended to be restrictive in any way to the invention described herein.

[0292] This application is based on Japanese Patent Application No. 2024-195329, filed on November 7, 2024. All of its contents are included here.

Claims

1. A terminal comprising: a transmitting unit that transmits an event trigger beam report for Conditional L1L2-triggered mobility (CLTM); and a control unit that evaluates whether candidate cells and beams meet the conditions for implementing CLTM and performs a serving cell switch using candidate cells and beams that meet the conditions.

2. The terminal according to claim 1, which receives the setting of the maximum number of candidate cells and the setting of the maximum number of beams per candidate cell in the event trigger beam report.

3. The terminal according to claim 1, further comprising a transmitting unit that transmits capability information indicating the number of candidate cells to be evaluated and the number of beams to be evaluated.

4. The terminal according to claim 1, wherein the control unit preferentially evaluates high-quality candidate cells and beams from among the candidate cells and beams included in the beam report.

5. A wireless communication method for a terminal comprising the steps of: transmitting an event trigger beam report for Conditional L1L2-triggered mobility (CLTM); evaluating whether candidate cells and beams satisfy the conditions for implementing the CLTM; and switching a serving cell using candidate cells and beams that satisfy the conditions.

6. A base station comprising: a receiving unit that receives event trigger beam reports for Conditional L1L2-triggered mobility (CLTM); and a control unit that evaluates whether candidate cells and beams satisfy the conditions for implementing CLTM and assumes that serving cell switching will be performed using candidate cells and beams that satisfy the conditions.

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