Wireless base station and wireless communication method

Abstract

This wireless base station comprises: a first device; and one or a plurality of second devices that are connected to the first device. The first device determines the enabling or disabling of a plurality of lower layer measurements, which are executed by using a specific event as a trigger, and / or a plurality of measurement reports, and transmits information indicating the determined enabling or disabling to the second device.

Description

Wireless Base Station and Wireless Communication Method

[0001] The present disclosure relates to a wireless base station and a wireless communication method that support LTM (L1 / L2 mobility).

[0002] The 3rd Generation Partnership Project (3GPP: registered trademark) is standardizing the 5th generation mobile communication system (also called 5G, New Radio (NR), or Next Generation (NG)), and is also proceeding with the standardization of the next generation, called Beyond 5G, 5G Evolution, or 6G.

[0003] For example, in 3GPP Release 19, the extension of layer 1 / layer 2 mobility (L1 / L2 mobility, specifically, Lower layer Triggered Mobility (LTM)) is being discussed (Non-Patent Document 1). LTM is a technology related to the mobility of a terminal (User Equipment, UE) in layer 1 or layer 2, and includes the transition (handover (HO)) of the UE to another cell or the like. HO by LTM is realized by a lower layer such as the media access control layer (MAC).

[0004] In the LTM defined in 3GPP Release-18, when a wireless base station is composed of a CU (Central Unit, first device) and a DU (Distributed Unit, second device), the UE transmits a layer 1 measurement report (L1 measurement report) to the Source DU. The Source DU selects a cell (or beam) with good quality included in the L1 measurement report and determines a candidate cell (beam) for LTM. The Source DU instructs the UE of the candidate cell (beam) by a cell switch command (Cell Switch Command MAC-CE).

[0005] Furthermore, 3GPP Release 19 indicates that, regarding LTM, for Event-triggered L1 Measurement Reporting (TTM), which is triggered by specific events such as the serving cell's beam quality falling below an absolute threshold, it is preferable to prepare multiple settings depending on the difference in the reference signal (RS) and candidate cells, thereby supporting low-latency activation / deactivation of Event-triggered L1 Measurement Reporting (Non-Patent Literature 2).

[0006] "New WID: NR mobility enhancements Phase 4", RP-234036, 3GPP TSG RAN Meeting #102, 3GPP, December 2023 "Measurement related enhancements for LTM", R1-2408722, 3GPP TSG RAN WG1 #118bis, 3GPP, October 2024

[0007] However, when wireless base stations adopt a CU-DU configuration, and multiple settings are prepared, particularly regarding Event-triggered L1 Measurement Reporting, the question arises as to how to enable / disable Event-triggered L1 Measurement Reporting or Layer 1 measurement (L1 Measurement). Furthermore, the status of Event-triggered L1 Measurement Reporting must be synchronized between the CU and DU.

[0008] Therefore, the following disclosure is made in light of these circumstances and aims to provide a wireless base station and wireless communication method that can efficiently and reliably control Event-triggered L1 Measurement Reporting even when a CU-DU configuration is adopted.

[0009] One aspect of the present disclosure is a radio base station (gNB100) including a first device and one or more second devices connected to the first device, wherein the first device includes a control unit (control unit 140) that determines whether to enable or disable at least one of a plurality of lower-layer measurements and reports of the plurality of said measurements that are performed in response to a specific event, and a transmission unit (measurement setting unit 130) that transmits information indicating the determined enable or disable to the second device.

[0010] One aspect of the present disclosure is a wireless base station comprising a first device and one or more second devices connected to the first device, wherein the second device includes a control unit that determines whether to enable or disable at least one of a plurality of lower-layer measurements and reports of the plurality of such measurements that are performed in response to a specific event, and a transmission unit that transmits information indicating the determined enable or disable to the first device.

[0011] Figure 1 is an overall schematic diagram of the wireless communication system 10. Figure 2 is a diagram showing an example of control by LTM (L1 / L2 mobility). Figure 3 is a functional block diagram of gNB100. Figure 4 is a functional block diagram of UE200. Figure 5 is a diagram showing example 1 of the activation / deactivation sequence of Event-triggered L1 Measurement Reporting. Figure 6 is a diagram showing example 2 of the activation / deactivation sequence of Event-triggered L1 Measurement Reporting. Figure 7 is a diagram showing an example of the hardware configuration of gNB100 and UE200. Figure 8 is a diagram showing an example of the configuration of vehicle 2001.

[0012] The embodiments will be described below with reference to the drawings. Note that identical or similar reference numerals are used to denote the same functions and components, and their descriptions will be omitted as appropriate.

[0013] (1) Overall schematic diagram 1 of the wireless communication system is an overall schematic diagram of the wireless communication system 10 according to this embodiment. The wireless communication system 10 is a wireless communication system in accordance with 5G New Radio (NR) and includes a Next Generation-Radio Access Network 20 (hereinafter referred to as NG-RAN20) and a terminal 200 (User Equipment 200, hereinafter referred to as UE200).

[0014] The wireless communication system 10 may be a wireless communication system conforming to a method called Beyond 5G, 5G Evolution, or 6G, or it may include a wireless communication system conforming to a method called Long Term Evolution (LTE) or 4G. The wireless communication system 10 may support functions related to the Industrial Internet of Things (IIoT) and URLLC (Ultra-Reliable and Low Latency Communications).

[0015] NG-RAN20 includes a wireless base station 100 (hereinafter referred to as gNB100). The specific configuration of the wireless communication system 10, including the number of gNBs (or eNBs, etc.) and UEs, is not limited to the example shown in Figure 1.

[0016] Furthermore, the gNB100 may employ a fronthaul (FH) interface as defined by the O-RAN (Open Radio Access Network Alliance). The gNB100 may include an O-DU (O-RAN Distributed Unit) and an O-RU (O-RAN Radio Unit). The gNB100 can function as a type of NG-RAN node.

[0017] NG-RAN20 actually includes multiple NG-RAN Nodes, specifically gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown). NG-RAN20 and 5GC may also be simply referred to as the "network." In 5GC, the concept of CUPS (Control and User Plane Separation) may be introduced, clearly separating the functions of the user plane and the control plane.

[0018] The gNB100 is a radio base station compliant with NR and performs NR-compliant wireless communication with the UE200. The gNB100 may also consist of a CU (Central Unit, first device) and a DU (Distributed Unit, second device), and the DU may be installed separately from the CU in a geographically different location. One or more DUs may be connected to the CU. The gNB100 (gNB-CU) may be connected by an Xn interface, and the CU and DU may be connected by an F1 interface (F1-AP, etc.). In this embodiment, the CU may be called a communication device or a central device, etc. The DU may be called a distributed device, etc.

[0019] The gNB100 and UE200 can support Massive MIMO, which generates a more directional beam by controlling the radio signals transmitted from multiple antenna elements; carrier aggregation (CA), which uses multiple component carriers (CCs) bundled together; and dual connectivity (DC), which enables simultaneous communication between the UE and multiple NG-RAN Nodes.

[0020] The DC type may be Multi-RAT Dual Connectivity (MR-DC), which utilizes multiple radio access technologies, or NR-NR Dual Connectivity (NR-DC), which utilizes only NR. For example, one gNB may constitute the master node (MN), and one or more other gNBs may constitute secondary nodes (SN).

[0021] Furthermore, the wireless communication system 10 may support conditional handover (CHO). CHO allows a UE200-led handover to be performed when specific execution conditions are met. If CHO is not applicable, a normal handover may be performed (this may be called CHO recovery). The wireless communication system 10 may also support conditional addition or change (CPAC) of Primary SCells (PSCells). A PSCell is a type of secondary cell. PSCell means Primary SCell (secondary cell) and may be interpreted as any of several SCells corresponding to it.

[0022] In the wireless communication system 10, not only Layer 3 mobility control of the UE200 (which may also be called L3 Mobility) but also Layer 1 and / or Layer 2 mobility control (L1 / L2 Mobility) may be applied. L1 / L2 Mobility may also be called LTM, and the name LTM will be used primarily below.

[0023] L3 Mobility may be interpreted as mobility control at the Radio Resource Control Layer (RRC). On the other hand, L1 / L2 Mobility may be interpreted as mobility control at the Physical Layer (PHY), Medium Access Control Layer (MAC), Radio Link Control Layer (RLC), and Packet Data Convergence Protocol Layer (PDCP) (mobility control by lower layers).

[0024] LTM may include network-triggered LTM and UE-triggered LTM (Conditional LTM, UE-triggered LTM).

[0025] Furthermore, in a Conditional LTM (which may also be called a UE-triggered LTM or UE-based LTM), similar to a Conditional Handover (CHO), the UE may, after the ground network base station (gNB) receives a specific execution condition, monitor the status according to that execution condition, and execute the LTM if the execution condition is satisfied.

[0026] LTM may also include LTM fast failure recovery. LTM fast failure recovery is a mechanism in which, in the event of an LTM failure, the UE200 performs cell selection, and if the selected cell is an LTM candidate cell, it directly applies the settings of that candidate cell without sending an RRC Reestablishment Request to the gNB100.

[0027] In a broad sense, the mobility of the UE200 may refer to the ease of movement and maneuverability of the UE200, but in this embodiment, it may also refer to the minimization of call drop, radio link (including beam) failure, unnecessary handovers, ping-pong situations, etc.

[0028] Figure 2 shows an example of control using LTM (L1 / L2 mobility). As shown in Figure 2, the MAC included in the lower layers (Layer 1 / Layer 2), rather than the RRC included in Layer 3, can perform measurement reporting, handover (HO) determination from source cell to target cell (which may include candidate cells), and timer management to determine the success or failure of the HO. Note that the lower layers may also include RLC and PDCP.

[0029] The MAC may report measurement reports, HO determinations, and timer information to the higher layer (RRC). Based on these reports, the RRC may manage the status of wireless resources associated with the cell transitions of the UE200.

[0030] The UE200 may perform periodic measurement reporting. Measurement reporting may be performed by measurements at a higher layer (which may be called Layer 3) (L3 Measurement) or by measurements at a lower layer (which may be called Layer 1) (L1 Measurement).

[0031] Furthermore, the UE200 may perform measurement reporting for each event (this may be called Event-triggered Measurement Reporting). Entering conditions to start measurement reporting and leaving conditions to end measurement reporting may be defined for each event. Existing events may include the events listed below (see 3GPP TS38.331). Note that the entering conditions may be interpreted as the conditions for determining whether or not to include an event in the measurement report, and the leaving conditions may be interpreted as the conditions for determining whether or not to exclude an event from the measurement report.

[0032] (i) Event A1 (Serving becomes better than threshold) Event A1 is an event in which the receiving quality of a serving cell becomes better than the threshold. For example, the entering condition is Ms - Hys > Thresh and the leaving condition is Ms + Hys < Thresh.

[0033] Here, Ms is the receiving quality of the serving cell, Hys is the hysteresis parameter, and Thresh is the threshold value.

[0034] (ii) Event A2 (Serving becomes worse than threshold) Event A2 is an event in which the receiving quality of a serving cell becomes worse than the threshold. For example, the entering condition is Ms + Hys < Thresh and the leaving condition is Ms - Hys > Thresh.

[0035] Here, Ms is the receiving quality of the serving cell, Hys is the hysteresis parameter, and Thresh is the threshold value.

[0036] (iii) Event A3 (Neighbor becomes offset better than SpCell) Event A3 is an event in which the reception quality of a neighboring cell becomes offset better than the reception quality of the serving cell. For example, the entering condition is Mn + Ofn + Ocn - Hys > Mp + Ofp + Ocp + Off, and the leaving condition is Mn + Ofn + Ocn + Hys < Mp + Ofp + Ocp + Off.

[0037] Here, Mn is the reception quality of neighboring cells, Ofn is the offset specific to the object being measured, and Ocn is the offset specific to the cell. Mp is the reception quality of the serving cell, Ofp is the offset specific to the object being measured, and Ocp is the offset specific to the cell. Hys is the hysteresis parameter, and Off is the parameter used in Event A3.

[0038] (iv) Event A4 (Neighbor becomes better than threshold) Event A4 is an event in which the reception quality of a neighboring cell becomes better than the threshold. For example, the entering condition is Mn + Ofn + Ocn - Hys > Thresh, and the leaving condition is Mn + Ofn + Ocn + Hys < Thresh.

[0039] Here, Mn is the reception quality of neighboring cells, Ofn is the offset specific to the measurement target, and Ocn is the offset specific to the cell. Hys is the hysteresis parameter, and Thresh is the threshold.

[0040] (v) Event A5 (SpCell becomes worse than threshold1 and neighbor becomes better than threshold2) Event A5 is an event in which the reception quality of a serving cell becomes worse than the threshold, and the reception quality of a neighboring cell becomes better than the threshold. For example, the entering condition is Mp + Hys < Thresh1 and Mn + Ofn + Ocn - Hys > Thresh2, and the leaving condition is Mp - Hys > Thresh1 and Mn + Ofn + Ocn + Hys < Thresh2.

[0041] Here, Ms is the reception quality of the serving cell, Hys is the hysteresis parameter, and Thresh1 is the threshold. Mn is the reception quality of neighboring cells, Ofn is the offset specific to the measurement target, and Ocn is the offset specific to the cell. Hys is the hysteresis parameter, and Thresh2 is the threshold.

[0042] (vi) Event A6 (Neighbor becomes offset better than SCell) Event A6 is an event in which the reception quality of a neighboring cell becomes offset better than the reception quality of SCell (Secondary Cell). For example, the entering condition is Mn + Ocn - Hys > Ms + Ocs + Off, and the leaving condition is Mn + Ocn + Hys < Ms + Ocs + Off.

[0043] In addition to the events mentioned above, events related to RATs (Radio Access technologies) may also be included (for example, B1 (Inter-RAT neighbor becomes better than threshold), B2 (Serving becomes worse than threshold1 and inter-RAT neighbor becomes better than threshold2)).

[0044] Here, Mn is the reception quality of neighboring cells, and Ocn is an offset specific to the cell. Ms is the reception quality of the SCell, and Ocs is an offset specific to the cell. Hys is the hysteresis parameter, and Off is the parameter used in Event A6.

[0045] Also, in this embodiment, an event dedicated to LTM may be defined. For example, the following events dedicated to LTM may be defined.

[0046] ・Event LTM2: Beam of serving cell becomes worse than absolute threshold (The beam of the serving cell deteriorates compared to the absolute threshold) ・Event LTM3: Beam of candidate cell becomes amount of offset better than beam of serving cell (The beam of the candidate cell becomes better than the offset amount of the beam of the serving cell) ・Event LTM4: Beam of candidate cell becomes better than absolute threshold (The beam of the candidate cell becomes better than the absolute threshold) ・Event LTM5: Beam of serving cell becomes worse than absolute threshold1 AND Beam of candidate cell becomes better than another absolute threshold2 (The beam of the serving cell deteriorates compared to absolute threshold 1, and the beam of the candidate cell becomes better than absolute threshold 2) Note that the events dedicated to LTM are not limited to Event LTM2 to Event LTM5 described above. For example, events related to the beam of the serving cell or the candidate cell may be added.

[0047] Also, in this embodiment, the channel includes a control channel and a data channel. The control channel includes a PDCCH (Physical Downlink Control Channel), a PUCCH (Physical Uplink Control Channel), a PRACH (Physical Random Access Channel), a PBCH (Physical Broadcast Channel), and the like.

[0048] Also, the data channel includes a PDSCH (Physical Downlink Shared Channel), a PUSCH (Physical Uplink Shared Channel), and the like.

[0049] Note that the reference signal includes a Demodulation reference signal (DMRS), a Sounding Reference Signal (SRS), a Phase Tracking Reference Signal (PTRS), a Channel State Information-Reference Signal (CSI-RS), and the like, and the signal includes a channel and a reference signal. Also, the data may mean the data transmitted via the data channel.

[0050] (2) Functional Block Configuration of Wireless Communication System Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configurations of the gNB 100 and the UE 200 will be described. FIG. 3 is a functional block configuration diagram of the gNB 100. FIG. 4 is a functional block configuration diagram of the UE 200.

[0051] (2.1) gNB 100 As shown in FIG. 3, the gNB 100 includes a wireless communication unit 110, a handover processing unit 120, a measurement setting unit 130, and a control unit 140.

[0052] The wireless communication unit 110 transmits a downlink signal (DL signal) according to NR. Also, the wireless communication unit 110 receives an uplink signal (UL signal) according to NR.

[0053] The handover processing unit 120 performs the handover of UE200. Specifically, the handover processing unit 120 performs the handover from the serving cell of UE200 to another neighboring cell.

[0054] In particular, in this embodiment, the handover processing unit 120 can handle mobility control by the lower layers of the UE200, specifically, handover (cell transition) according to LTM.

[0055] While a serving cell can simply be interpreted as the cell to which the UE200 is connected, more precisely, in the case of an RRC_CONNECTED UE without carrier aggregation (CA) configured, there is only one serving cell that constitutes the primary cell. In the case of an RRC_CONNECTED UE configured with CA, a serving cell can be interpreted as representing one or more sets of cells, including the primary cell and all secondary cells.

[0056] Furthermore, handovers may include conditional handovers (CHO) and / or dual active protocol stack (DAPS) handovers. A CHO allows a UE200-initiated handover to be performed when specific execution conditions are met. If a CHO is not applicable, a normal handover may be performed (which may be called a CHO recovery). In a CHO recovery, the UE200 performs cell selection after a CHO failure, but if a CHO candidate cell is selected, it can directly apply conditional RRCReconfiguration to that cell and reconnect without sending an RRC Reestablishment Request to the candidate target cell.

[0057] The execution conditions may consist of one or two trigger conditions (e.g., CHO events A3 / A5 as defined in 3GPP TS38.331). A single reference signal (RS) type may be triggered, and up to two different trigger quantities (e.g., Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ), RSRP and Signal-to-Interference plus Noise power Ratio (SINR), etc.) may be set simultaneously for evaluation of the CHO execution conditions of a single candidate cell.

[0058] The measurement setting unit 130 performs the setting (measurement configuration) of the quality measurement of the serving cell and neighboring cells by the UE200. Specifically, the measurement setting unit 130 may perform the measurement configuration at Layer 3, or it may perform the measurement configuration at Layer 1 and / or Layer 2.

[0059] The measurement setting unit 130 can notify the UE200 of the contents of the measurement settings. Based on the notified measurement settings, the UE200 may measure the quality of the serving cell and / or neighboring cells. The measurement setting unit 130 can receive a measurement report from the UE200 showing the measurement results of the cell quality.

[0060] Furthermore, the measurement setting unit 130 may set the UE200 to enable or disable (activate / deactivate) the Measurement report (or the Measurement itself) which is executed as a trigger for the aforementioned events (for example, Events A1 to A6, Events LTM2 to 5).

[0061] Specifically, the measurement setting unit 130 may send lower-layer control information to the UE200 instructing activation / deactivation for at least one of several lower-layer measurements (which may be called L1 measurements) that are performed triggered by a specific event. The measurement setting unit 130 may also send lower-layer control information to perform activation / deactivation for at least one of several event-triggered L1 measurement reports (event-triggered L1 measurement reporting).

[0062] Note that measurement at lower layers may refer to measurement at Layer 1 including the PHY (which may also include MAC), but may also include processing related to measurements at RLC and PDCP. Control information at lower layers is typically the control elements of the media access control layer (MAC CE), but may also be Downlink Control Information (DCI).

[0063] Furthermore, the measurement setting unit 130, which constitutes the CU, may transmit information indicating the activation / deactivation determined by the control unit 140 to the DU (second device). Alternatively, the measurement setting unit 130, which constitutes the DU, may transmit information indicating the activation / deactivation determined by the control unit 140 to the CU (first device). In this embodiment, the measurement setting unit 130 may constitute a transmission unit that transmits information indicating activation or deactivation.

[0064] This information may be transmitted or received in accordance with the sequence in the higher layer (e.g., RRC) between the gNB100 and UE200, or it may be transmitted or received independently of the sequence in the higher layer.

[0065] The control unit 140 controls each functional block that constitutes the gNB100. In particular, in this embodiment, the control unit 140 can perform measurement reporting by the UE200 and mobility control with the UE200. Specifically, the control unit 140 can perform not only mobility control according to L3 Mobility but also mobility control according to LTM (L1 / L2 mobility).

[0066] Furthermore, the control unit 140 can perform control as a CU (source side or target side) or DU (source side or target side) in the gNB100 which has a CU-DU configuration.

[0067] In this embodiment, the control unit 140 (which may here mean operating as both a CU and a DU) can control the transition of the UE200 to a candidate cell according to mobility control (LTM) by the lower layer. Specifically, the control unit 140 can perform control as either a CU (source side or target side) or a DU (source side or target side) in a gNB100 having a CU-DU configuration.

[0068] Specifically, the control unit 140 may decide to enable or deactivate at least one of several lower-layer measurements (which may be called L1 measurements) that are performed in response to a specific event.

[0069] Furthermore, the measurement setting unit 130 may determine activation / deactivation based on at least one of the multiple event-triggered L1 measurement reports. This activation / deactivation determination may be performed by the CU or by the DU.

[0070] The control unit 140 may determine the activation / deactivation of L1 Measurement or Event-triggered L1 Measurement Reporting based on the event used to trigger the Measurement report (the event itself or the event ID), the report settings (report config ID), or the identification information of the cell or beam (cell ID, beam ID). Note that these IDs are examples, and the activation / deactivation may also be determined based on a combination of multiple elements (e.g., an event and a cell) as the basis (unit).

[0071] The control unit 140 may determine the activation / deactivation based on a specific frequency or reference signal. This specific frequency may be specified by identification information (measObjectID) that designates the object to be measured, or by identification information (frequency ID) of the frequency (band). The reference signal (RS) is not particularly limited, but here it may refer to CSI-RS. In a broader sense, it may also include SSB (SS / PBCH Block) consisting of a synchronization signal (SS) and a downlink physical broadcast channel (PBCH).

[0072] (2.2) UE200 As shown in Figure 4, the UE200 comprises a wireless communication unit 210, a measurement reporting unit 220, a handover execution unit 230, and a control unit 240.

[0073] The wireless communication unit 210 transmits an uplink signal (UL signal) in accordance with NR. The wireless communication unit 210 also receives an uplink signal (DL signal) in accordance with NR.

[0074] The measurement reporting unit 220 can measure the quality of the UE200's serving cell and its neighbor cell, and report a measurement report showing the measurement results to the network. The measurement reporting unit 220 may perform measurement reporting of the source cell and target cell during handover. The measurement reporting unit 220 may transmit a measurement report including the quality of the serving cell and neighbor cell.

[0075] The quality of the object being measured can be, for example, the quality included in the Measurement Report as defined in 3GPP TS38.331 (e.g., Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ)).

[0076] Furthermore, the measurement reporting unit 220 may support events (e.g., Event LTM2, Event LTM3, etc.) used to trigger Measurement reports in accordance with mobility control (LTM) by lower layers. For example, the measurement reporting unit 220 may receive lower layer control information that instructs activation / deactivation of at least one of the following: multiple measurements (L1 Measurement) and reports of multiple such measurements (Event-triggered L1 Measurement Reporting) performed by lower layers triggered by a specific event.

[0077] As mentioned above, measurements at lower layers may refer to measurements at Layer 1 including the PHY (which may also include MAC), but may also include processing related to measurements at RLC and PDCP. Furthermore, the control information at lower layers may be MAC CE or DCI.

[0078] Activation / deactivation may be interpreted as starting or ending (stopping) the execution of the measurement (or measurement report), or as setting or canceling the measurement (or measurement report). From this perspective, activation / deactivation may be reinterpreted as activation / deactivation, start / end, set / cancel, etc.

[0079] Furthermore, the control information (MAC CE or DCI) may be transmitted or received in accordance with the sequence in the higher layer (e.g., RRC) between the gNB100 and UE200, or it may be transmitted or received independently of the sequence in the higher layer.

[0080] The measurement reporting unit 220 may transmit the above-mentioned Measurement report using the control element (MAC CE) of the media access control layer or PUCCH (upstream control channel). Note that the upstream control channel used to transmit the Measurement report is not necessarily limited to PUCCH; any channel for control information may be used.

[0081] The measurement reporting unit 220 may transmit measurement reporting capability information (UE Capability Information) to the network. For example, the measurement reporting unit 220 may report to the network whether or not it supports receiving the lower-layer control information described above, that is, whether or not it supports activation / deactivation of at least one of a specific L1 Measurement and Event-triggered L1 Measurement Reporting.

[0082] The handover execution unit 230 performs the handover of UE200. Specifically, the handover execution unit 230 may perform the handover to the destination cell (NG-RAN node) based on the control by gNB100.

[0083] Furthermore, the handover execution unit 230 can perform processing related to normal handover (legacy handover), conditional handover (CHO), and DAPS handover.

[0084] In the case of CHO, the handover execution unit 230 may transition to a candidate cell when the execution condition is met. The execution condition may be determined based on the quality of the reference signal (RS), specifically the values ​​of RSRP, RSRQ, or SINR, as described above.

[0085] Furthermore, the transition destination of CHO may or may not be accompanied by SCG. In other words, the cell to which CHO transitions may be a single cell, or it may consist of multiple cells (which may be interpreted as a cell group) according to DC.

[0086] Furthermore, the handover execution unit 230 may perform handovers based not only on L3 Mobility but also on LTM (L1 / L2 Mobility). Handover may be rephrased as transition, cell transition, cell selection, etc. Specifically, the handover execution unit 230 may perform an LTM-based handover based on at least one command from Layer 1 and / or Layer 2.

[0087] The type of command is not particularly limited, but may be, for example, an L1 / L2 Mobility command. The L1 / L2 Mobility command may be reinterpreted as another command in the RRC layer or a control element (CE) in the MAC layer. The handover execution unit 230 may receive configuration information relating to L1 / L2 Mobility (LTM). This configuration information may mean LTM-config. However, it does not necessarily have to be LTM-config, as long as it indicates LTM-config (which may include execution conditions, etc.).

[0088] The control unit 240 controls each functional block that constitutes the UE200. Specifically, the control unit 240 can perform L1 / L2 Mobility (LTM), that is, mobility control of at least one of Layer 1 and Layer 2. Mobility control by L1 / L2 Mobility may include quality measurement of the service area and neighboring cells in Layer 1 or Layer 2, setting of candidate fiber destination cells, cell reselection (transition), and handover. In this way, the control unit 240 can control handover according to mobility control by the lower layers.

[0089] Furthermore, the control unit 240 may perform activation / deactivation of L1 Measurement or Event-triggered L1 Measurement Reporting based on lower-layer control information (MAC CE or DCI) received by the measurement reporting unit 220 that instructs activation / deactivation of at least one of L1 Measurement and Event-triggered L1 Measurement Reporting.

[0090] Specifically, the control unit 240 may activate / deactivate L1 Measurement or Event-triggered L1 Measurement Reporting based on the event used to trigger the Measurement report (the event itself or the event ID), the report settings (report config ID), or cell or beam identification information (cell ID, beam ID). These IDs are examples, and the activation / deactivation may also be performed based on a combination of multiple elements (e.g., an event and a cell) as the basis (unit).

[0091] Furthermore, the control unit 240 may perform the activation / deactivation based on a specific frequency or reference signal. The specific frequency may be specified by identification information (measObjectID) that specifies the object to be measured, or by identification information (frequency ID) of the frequency (band). The reference signal (RS) is not particularly limited, but here it may be CSI-RS. In a broader sense, it may also include SSB (SS / PBCH Block).

[0092] The control unit 240 may perform activation / deactivation on reports configured in higher layers. Specifically, the control unit 240 may perform activation / deactivation on Event-triggered L1 Measurement Reporting configured in RRC. For example, the control unit 240 may activate Event-triggered L1 Measurement Reporting that has been disabled in RRC according to the control information, or it may deactivate Event-triggered L1 Measurement Reporting that has been enabled in RRC according to the control information.

[0093] (3) Operation of the Wireless Communication System Next, the operation of the wireless communication system 10 will be described. Specifically, the operation related to the activation / deactivation of L1 Measurement or Event-triggered L1 Measurement Reporting will be described.

[0094] (3.1) Premise and Issues As mentioned above, 3GPP Release 19 indicates that, with respect to LTM, it is preferable to prepare multiple settings for Event-triggered L1 Measurement Reporting, which is triggered by specific events such as the serving cell beam quality falling below an absolute threshold, depending on the differences in the reference signal (RS) and candidate cell (LTM candidate cell), and that this will support the activation / deactivation of low-latency Event-triggered L1 Measurement Reporting.

[0095] However, when the gNB is split into CU and DU (CU-DU split), it is unclear which RAN node will determine (trigger) the activation / deactivation of Event-triggered L1 Measurement Reporting (abbreviated as event-triggered reporting or L1 measurement reporting as appropriate). Furthermore, when the gNB is split into CU and DU, the activation / deactivation state of event-triggered reporting needs to be matched between the CU and DU, but currently, such state matching is difficult. For this reason, it is difficult to control Event-triggered L1 Measurement Reporting efficiently and reliably.

[0096] (3.2) Operation Example Figure 5 shows example 1 of the activation / deactivation sequence for Event-triggered L1 Measurement Reporting. Figure 6 shows example 2 of the activation / deactivation sequence for Event-triggered L1 Measurement Reporting.

[0097] As shown in Figure 5, the CU may determine the activation / deactivation of Event-triggered reporting. Alternatively, as mentioned above, the CU may determine the activation / deactivation of L1 Measurement instead of Event-triggered reporting.

[0098] The activation / deactivation of Event-triggered L1 Measurement Reporting may be determined using either the frequency of the L1 measurement reporting target (e.g., measObjectID, frequency ID) or the RS of the L1 measurement reporting target (e.g., CSI-RS, SSB, CSI-RS / SSB index).

[0099] Alternatively, the activation / deactivation of Event-triggered L1 Measurement Reporting may be determined on a per-report config ID basis, or on a per-event or per-event ID basis.

[0100] Alternatively, the activation / deactivation of Event-triggered L1 Measurement Reporting may be determined on a per-cell ID or beam ID basis for L1 measurement reporting.

[0101] The CU may notify the DU of the activation / deactivation status of the Event-triggered reporting via the F1 interface. The CU may perform this notification on a per-unit basis, such as frequency, RS, report config ID, cell ID, or beam ID, as well as on the activation / deactivation determination.

[0102] As shown in Figure 6, the DU may determine the activation / deactivation of Event-triggered reporting. Alternatively, the DU may determine the activation / deactivation of L1 Measurement instead of Event-triggered reporting.

[0103] Similar to CU, the activation / deactivation of Event-triggered L1 Measurement Reporting may be determined using either the frequency of the L1 measurement reporting target (e.g., measObjectID, frequency ID) or the RS of the L1 measurement reporting target (e.g., CSI-RS, SSB, CSI-RS / SSB index).

[0104] Alternatively, the activation / deactivation of Event-triggered L1 Measurement Reporting may be determined on a per-report config ID basis, or on a per-event or per-event ID basis.

[0105] Alternatively, the activation / deactivation of Event-triggered L1 Measurement Reporting may be determined on a per-cell ID or beam ID basis for L1 measurement reporting.

[0106] The DU may notify the CU of the activation / deactivation status of Event-triggered reporting via the F1 interface. The DU may perform this notification on a per-unit basis, such as frequency, RS, report config ID, cell ID, or beam ID, as well as on the activation / deactivation determination.

[0107] As illustrated by the operation example above, the CU (or DU) can determine the activation / deactivation of Event-triggered L1 Measurement Reporting or L1 Measurement, and can notify the DU (or CU) of the determined activation / deactivation (enable or disable). Therefore, even if the gNB adopts a CU-DU configuration (CU-DU split) and multiple settings for Event-triggered L1 Measurement Reporting (i.e., L1 Measurement) are prepared, the state of Event-triggered L1 Measurement Reporting can be matched between the CU and DU, enabling efficient and reliable control of Event-triggered L1 Measurement Reporting.

[0108] In this embodiment, the activation or deactivation can be performed based on a specific event, measurement report settings, or cell or beam identification information, or based on a specific frequency or reference signal. This allows for more efficient control of Event-triggered L1 Measurement Reporting.

[0109] (4) Other Embodiments The contents of the present invention have been described above in accordance with the embodiments, but it will be obvious to those skilled in the art that the present invention is not limited to these descriptions and that various modifications and improvements are possible.

[0110] For example, in the above description, configure, activate, update, indicate, enable, specify, and select may be interpreted as interchangeable. Similarly, link, associate, correspond, and map may be interpreted as interchangeable, and allocate, assign, monitor, and map may also be interpreted as interchangeable.

[0111] Furthermore, "specific," "dedicated," "UE specific," and "UE individual" may be interpreted interchangeably. Similarly, "common," "shared," "group-common," "UE common," and "UE shared" may be interpreted interchangeably.

[0112] 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,” “antenna port group,” “layer,” “number of layers,” “rank,” “resource,” “resource set,” “resource group,” “beam,” “beam width,” “beam angle,” “antenna,” “antenna element,” and “panel” may be used interchangeably.

[0113] Furthermore, the block diagram (Figure 3.4) used in the description of the embodiments above shows functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Moreover, 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 software with the one or more of the above devices.

[0114] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. In any case, as mentioned above, the method of implementation is not particularly limited.

[0115] Furthermore, the gNB100 and UE200 (the device) described above may function as a computer that processes the wireless communication method of this disclosure. Figure 7 shows an example of the hardware configuration of the device. As shown in Figure 7, the device may be configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, and bus 1007.

[0116] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the device may include one or more of the devices shown in the diagram, or it may be configured to omit some of the devices.

[0117] Each functional block of the device (see Figures 3 and 4) is implemented by any hardware element of the computer device, or a combination of such hardware elements.

[0118] Furthermore, each function in the device is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0119] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, and so on.

[0120] 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. Moreover, the above-mentioned various processes may be executed by one processor 1001, or by two or more processors 1001 simultaneously or sequentially. The processor 1001 may be implemented by one or more chips. The program may also be transmitted from a network via a telecommunications line.

[0121] 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 Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store a program (program code), software module, etc., that can execute a method according to one embodiment of this disclosure.

[0122] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., Compact Disc, Digital Multipurpose Disc, Blu-ray® Disc), a smart card, flash memory (e.g., a card, stick, key drive), a floppy® disk, a magnetic strip, etc. Storage 1003 may also be called an auxiliary storage device. The recording medium described above may also be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0123] The communication device 1004 is hardware (transceiver / receiver 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.

[0124] The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0125] 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, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0126] 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.

[0127] Furthermore, the device may 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 by such hardware. For example, processor 1001 may be implemented using at least one of these hardware components.

[0128] Furthermore, notification of information is not limited to the embodiments described herein and may be carried out by other means. For example, notification of information may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or combinations thereof. RRC signaling may also be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0129] Each aspect / embodiment described herein may be applied to at least one of the following: Long Term Evolution (LTE), LTE-Advanced (LTE-A), 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 (NR), W-CDMA®, GSM®, CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth®, and other appropriate systems, as well as next-generation systems extended based thereon. Furthermore, multiple systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A with 5G).

[0130] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be reordered, provided they do not contradict each other. For example, the methods described in this disclosure present various step elements using exemplary order and are not limited to the specific order presented.

[0131] The specific operations described in this disclosure as being performed by a base station may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can be performed by the base station and at least one other network node (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station, it may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0132] Information and signals (such as data) can be output from a higher layer (or lower layer) to a lower layer (or higher layer). Input and output may occur via multiple network nodes.

[0133] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be sent to other devices.

[0134] The determination may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0135] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0136] 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.

[0137] 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 technologies (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technologies (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0138] The information, signals, etc. described in this disclosure may be represented using any of the various different technologies. 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.

[0139] In addition, 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, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0140] The terms “system” and “network” as used in this disclosure are interchangeable.

[0141] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0142] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not restrictive in any way.

[0143] In this disclosure, terms such as "Base Station (BS)," "wireless base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "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.

[0144] A base station can house one or more (e.g., three) cells (also called sectors). If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0145] The terms "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base stations and base station subsystems that provide communication services in this coverage.

[0146] 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 control or operation based on the information.

[0147] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0148] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate term.

[0149] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to a movable object, and its speed of movement is arbitrary. This also includes the case when the mobile body is stationary. The mobile body includes, but is 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 (registered trademark), multicopters, quadcopters, balloons, and items mounted on them. The mobile body may also be a mobile body that moves autonomously based on operation commands. It may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station may include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0150] Furthermore, the term "base station" in this disclosure may be interpreted as "mobile station" (user terminal, hereinafter the same). For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). In this case, the mobile station may have the functions that a base station has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc. may be interpreted as side channel (or side link).

[0151] Similarly, the term "mobile station" in this disclosure may be interpreted as "base station." In this case, the base station may be configured to have the functions that a mobile station has.

[0152] A wireless frame may consist of one or more frames in the time domain. Each of these one or more frames in the time domain may be called a subframe. A subframe may further 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.

[0153] Numerology may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerology may include, 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.

[0154] 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). A slot may also be a time unit based on neurology.

[0155] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0156] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0157] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe in existing LTE (1ms), a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0158] Here, TTI refers to, for example, the smallest unit of time 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.

[0159] 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. Note that 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 given TTI.

[0160] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0161] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0162] 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.

[0163] 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.

[0164] Furthermore, the time domain of RB may contain one or more symbols and may be 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.

[0165] One or more RBs may also be called a Physical RB (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0166] 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.

[0167] 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. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a given BWP.

[0168] A BWP may include BWPs for UL (UL BWP) and BWPs for DL ​​(DL BWP). One or more BWPs may be set within a single carrier for a UE.

[0169] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0170] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. 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 a TTI can be varied in various ways.

[0171] The terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0172] The reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applicable standard.

[0173] 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."

[0174] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0175] Any reference to elements using designations such as “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, references to the First and Second elements do not imply that only two elements may be employed therein, or that the First element must precede the Second element in any way.

[0176] 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 be exclusive OR.

[0177] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0178] The terms “determining” and “determining” as used in this disclosure may encompass a wide variety of actions. “Determining” and “determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, or inquiring (e.g., searching in a table, database, or other data structure), or ascertaining. “Determining” and “determining” may also include receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, or accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having "judgmented" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having "judgmented" or "decided" about some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0179] 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."

[0180] Figure 8 shows an example of the configuration of vehicle 2001. As shown in Figure 8, vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013.

[0181] The drive unit 2002 consists of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and rear wheels based on the operation of the steering wheel operated by the user. The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2027 provided in the vehicle are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0182] Signals from various sensors 2021 to 2028 include current signals from the current sensor 2021 that senses motor current, front and rear wheel rotation speed signals obtained by the rotation speed sensor 2022, front and rear wheel air pressure signals obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression signals obtained by the accelerator pedal sensor 2029, brake pedal depression signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, and detection signals obtained by the object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0183] The Information Services Unit 2012 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, television, and radio, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of Vehicle 1.

[0184] Information Services Unit 2012 may include input devices that accept input from external sources (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) and output devices that perform output to external sources (e.g., displays, speakers, LED lamps, touch panels, etc.).

[0185] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System)), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0186] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 1 via its communication port. For example, the communication module 2013 sends and receives data via the communication port 2033 between the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 2028 provided in the vehicle 2001.

[0187] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 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 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station or a mobile station.

[0188] The communication module 2013 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 2021 to 2028 input to the electronic control unit 2010, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 2012. The electronic control unit 2010, the various sensors 2021 to 2028, the information service unit 2012, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

[0189] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 2012 installed in the vehicle. The information service unit 2012 may also be called an output unit, which outputs information (for example, 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 2013). The communication module 2013 also stores the various information received from the external device in a memory 2032 that is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axles 2009, sensors 2021-2028, etc., installed in the vehicle 2001.

[0190] (Note) The above disclosure may also be expressed as follows: The first feature is a wireless base station comprising a first device and one or more second devices connected to the first device, wherein the first device comprises a control unit that determines whether to enable or disable at least one of a plurality of lower-layer measurements and reports of the plurality of said measurements that are performed in response to a specific event, and a transmission unit that transmits information indicating the determined enable or disable to the second device.

[0191] The second feature is a wireless base station comprising a first device and one or more second devices connected to the first device, wherein the second device includes a control unit that determines whether to enable or disable at least one of a plurality of lower-layer measurements and reports of the plurality of said measurements that are performed triggered by a specific event, and a transmission unit that transmits information indicating the determined enable or disable to the first device.

[0192] The third feature is that, in the first or second feature, the control unit determines the enable or disable based on the event, the reporting settings, or the identification information of the cell or beam.

[0193] The fourth feature is that, in the first to third features, the control unit determines the enable or disable based on a specific frequency or reference signal.

[0194] This patent application claims priority based on Japanese Patent Application No. 2024-194688, filed on November 6, 2024, and the entire contents of Japanese Patent Application No. 2024-194688 are incorporated herein by reference.

[0195] 10 Wireless communication system 20 NG-RAN 100 gNB 110 Wireless communication unit 120 Handover processing unit 130 Measurement setting unit 140 Control unit 200 UE 210 Wireless communication unit 220 Measurement reporting unit 230 Handover execution unit 240 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus 2001 Vehicle 2002 Drive unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Left and right front wheels 2008 Left and right rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 Rotation speed sensor 2023 Air pressure sensor 2024 Vehicle speed sensor 2025 Acceleration sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driver assistance system unit 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port

Claims

1. A wireless base station comprising a first device and one or more second devices connected to the first device, wherein the first device comprises a control unit that determines whether to enable or disable at least one of a plurality of lower-layer measurements and reports of the plurality of said measurements that are performed triggered by a specific event, and a transmission unit that transmits information indicating the determined enable or disable to the second device.

2. A wireless base station comprising a first device and one or more second devices connected to the first device, wherein the second device comprises a control unit that determines whether to enable or disable at least one of a plurality of lower-layer measurements and reports of the plurality of said measurements that are performed triggered by a specific event, and a transmission unit that transmits information indicating the determined enable or disable to the first device.

3. The radio base station according to claim 1 or 2, wherein the control unit determines the activation or deactivation based on the event, the reporting settings, or the identification information of the cell or beam.

4. The radio base station according to claim 1 or 2, wherein the control unit determines the activation or deactivation based on a specific frequency or reference signal.

5. A wireless communication method in a radio base station including a first device and one or more second devices connected to the first device, comprising the steps of: the first device determining whether to enable or disable at least one of a plurality of lower-layer measurements and reports of the plurality of said measurements that are performed triggered by a specific event; and the first device transmitting information indicating the determined enable or disable to the second device.

6. A wireless communication method in a radio base station including a first device and one or more second devices connected to the first device, the method comprising: a step in which the second device determines whether to enable or disable at least one of a plurality of lower-layer measurements and reports of the plurality of said measurements that are performed in response to a specific event; and a step in which the second device transmits information indicating the determined enable or disable to the first device.

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