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WO2025173773A1 - Procédé de communication, dispositif utilisateur et nœud de réseau - Google Patents

Procédé de communication, dispositif utilisateur et nœud de réseau

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Publication number
WO2025173773A1
WO2025173773A1 PCT/JP2025/004989 JP2025004989W WO2025173773A1 WO 2025173773 A1 WO2025173773 A1 WO 2025173773A1 JP 2025004989 W JP2025004989 W JP 2025004989W WO 2025173773 A1 WO2025173773 A1 WO 2025173773A1
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WIPO (PCT)
Prior art keywords
cell
measurement
rrc
network
information
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English (en)
Japanese (ja)
Inventor
真人 藤代
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Kyocera Corp
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Kyocera Corp
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic

Definitions

  • LTM L1/L2-Triggered Mobility
  • a network node receives Layer 1 (L1) measurement reports from a user equipment, and based on those reports, the network node signals a cell switch command to the user equipment via the medium access control (MAC) control element (CE), causing the network node to change the serving cell of the user equipment.
  • L1 Layer 1
  • CE medium access control
  • This disclosure provides technology that enables network optimization for LTM.
  • FIG. 1 is a diagram illustrating a configuration example of a mobile communication system according to an embodiment.
  • FIG. 1 is a diagram illustrating a configuration example of a UE (user equipment) according to an embodiment.
  • FIG. 10 is a diagram showing the configuration of a protocol stack of a radio interface of a user plane that handles data.
  • FIG. 1 is a diagram showing the configuration of the protocol stack of the radio interface of the control plane that handles signaling (control signals).
  • FIG. 1 shows a configuration for measurements by a UE.
  • FIG. 10 is a diagram illustrating an example of an LTM procedure.
  • FIG. 10 is a diagram illustrating an example of an LTM procedure.
  • FIG. 10 is a diagram illustrating the operation of a UE according to an embodiment.
  • FIG. 4 is a diagram illustrating an example of a first operation pattern according to the embodiment.
  • FIG. 10 is a diagram illustrating an example of a second operation pattern according to the embodiment.
  • FIG. 10 is a diagram for explaining a HOF report according to a second operation pattern.
  • FIG. 10 is a diagram for explaining SHR according to a second operation pattern.
  • FIG. 10 is a diagram illustrating the operation of a UE according to a modified example of an embodiment.
  • the mobile communication system 1 includes a user equipment (UE) 100, a 5G radio access network (NG-RAN: Next Generation Radio Access Network) 10, and a 5G core network (5GC: 5G Core Network) 20.
  • NG-RAN Next Generation Radio Access Network
  • 5GC 5G Core Network
  • the NG-RAN 10 may be simply referred to as the RAN 10.
  • the 5GC 20 may also be simply referred to as the core network (CN) 20.
  • the RAN 10 and the CN 20 constitute the network 5 of the mobile communication system 1.
  • UE100 is a mobile wireless communication device.
  • UE100 may be any device that is used by a user.
  • UE100 is a mobile phone terminal (including a smartphone) and/or a tablet terminal, a notebook PC, a communication module (including a communication card or chipset), a sensor or a device provided in a sensor, a vehicle or a device provided in a vehicle (Vehicle UE), or an aircraft or a device provided in an aircraft (Aerial UE).
  • NG-RAN10 includes base stations (referred to as "gNBs" in 5G systems) 200, which are a type of network node. gNBs 200 are connected to each other via an Xn interface, which is an interface between base stations. gNBs 200 manage one or more cells. gNBs 200 perform wireless communication with UEs 100 that have established a connection with their own cell. gNBs 200 have radio resource management (RRM) functions, user data (hereinafter simply referred to as “data”) routing functions, measurement control functions for mobility control and scheduling, and more.
  • RRM radio resource management
  • Cell is used as a term to indicate the smallest unit of a wireless communication area.
  • Cell is also used as a term to indicate functions or resources for wireless communication with UEs 100.
  • One cell belongs to one carrier frequency (hereinafter simply referred to as "frequency").
  • FIG. 2 is a diagram showing an example configuration of a UE 100 (user equipment) according to an embodiment.
  • the UE 100 has a receiving unit 110, a transmitting unit 120, and a control unit 130.
  • the receiving unit 110 and the transmitting unit 120 constitute a wireless communication unit 140 that performs wireless communication with the gNB 200.
  • the receiving unit 110 performs various types of reception under the control of the control unit 130.
  • the receiving unit 110 includes an antenna and a receiver.
  • the receiver converts the radio signal received by the antenna into a baseband signal (received signal) and outputs it to the control unit 130.
  • FIG. 3 is a diagram showing an example configuration of a gNB200 (network node) according to an embodiment.
  • the gNB200 has a transmitter 210, a receiver 220, a controller 230, and a network communication unit 240.
  • the transmitter 210 and receiver 220 constitute a wireless communication unit 250 that performs wireless communication with the UE100.
  • the network communication unit 240 has a transmitter 241 that performs transmission and a receiver 242 that performs reception.
  • the receiving unit 220 performs various types of reception under the control of the control unit 230.
  • the receiving unit 220 includes an antenna and a receiver.
  • the receiver converts the radio signal received by the antenna into a baseband signal (received signal) and outputs it to the control unit 230.
  • the user plane radio interface protocol has a physical (PHY) layer, a medium access control (MAC) layer, a radio link control (RLC) layer, a packet data convergence protocol (PDCP) layer, and a service data adaptation protocol (SDAP) layer.
  • PHY physical
  • MAC medium access control
  • RLC radio link control
  • PDCP packet data convergence protocol
  • SDAP service data adaptation protocol
  • the RLC layer uses the functions of the MAC layer and PHY layer to transmit data to the RLC layer on the receiving side. Data and control information are transmitted between the RLC layer of UE100 and the RLC layer of gNB200 via logical channels.
  • the PDCP layer performs header compression/decompression, encryption/decryption, etc.
  • the SDAP layer maps IP flows, which are the units by which the core network controls QoS (Quality of Service), to radio bearers, which are the units by which the AS (Access Stratum) controls QoS. Note that if the RAN is connected to the EPC, SDAP is not required.
  • the protocol stack for the radio interface of the control plane has an RRC (Radio Resource Control) layer and a NAS (Non-Access Stratum) layer instead of the SDAP layer shown in Figure 4.
  • RRC Radio Resource Control
  • NAS Non-Access Stratum
  • RRC signaling for various settings is transmitted between the RRC layer of UE100 and the RRC layer of gNB200.
  • the RRC layer controls logical channels, transport channels, and physical channels in accordance with the establishment, re-establishment, and release of radio bearers.
  • RRC connection connection between the RRC of UE100 and the RRC of gNB200
  • UE100 is in an RRC connected state.
  • RRC connection no connection between the RRC of UE100 and the RRC of gNB200
  • UE100 is in an RRC idle state.
  • UE100 is in an RRC inactive state.
  • the UE 100 in the RRC connected state measures at least one beam of a cell and derives the radio quality of the cell by averaging the measurement results (power values). At this time, the UE 100 is configured to consider a subset of the detected beams.
  • L1 filtering which is filtering at the physical layer (PHY, Layer 1 (L1)
  • L3 filtering which is filtering at the RRC layer (Layer 3 (L3)) level.
  • cell quality from beam measurements is derived in the same way for serving and non-serving cells.
  • UE100 may include measurement results of the X best beams in the L3 measurement report, depending on the configuration by gNB200.
  • Figure 6 shows the configuration related to measurements by UE100.
  • the control unit 130 of the UE 100 has an L1 filter 11, a beam combining/selecting unit 12, an L3 filter 13, an evaluation unit 14, an L3 beam filter 15, and a beam selecting unit 16.
  • the L1 filter 11 includes K L1 filters 11 corresponding to the K beams.
  • K measurement values A obtained by the UE 100 (receiver 110) measuring the radio quality for each of the K beams are input to the L1 filter 11.
  • the K measurement values A for the K beams are measurements (beam-specific samples) within the physical layer and are measurements of an SSB (SS/PBCH block) or CSI (Channel State Information) reference signal resource detected by the UE 100 (receiver 110) in L1.
  • the L1 filter 11 performs L1 filtering on the K measurement values A for the K beams in L1, and outputs the beam-specific measurement values A1 after L1 filtering to the beam combining/selecting unit 12 and the L3 beam filter 15.
  • the L3 filter 13 filters the measurement value (cell quality B) output by the beam combining/selection unit 12 at L3 and outputs the measurement value C after L3 filtering to the evaluation unit 14.
  • the configuration of the operation of the L3 filter 13 is provided by RRC signaling from the gNB 200.
  • the measurement value C after L3 filtering is used as input for one or more evaluations of the L3 measurement report from the UE 100 to the gNB 200.
  • the L3 filter 13 filters the measurement results for each cell measurement and each beam measurement by the following equation (1) before using them for evaluation of reporting criteria or for L3 measurement reporting:
  • F n (1-a) ⁇ F n-1 +a ⁇ M n ...(1)
  • M n is the latest measurement from the physical layer (L1)
  • F n is the updated filtered measurement, used for evaluation of reporting criteria or L3 measurement reporting
  • F n-1 is the old filtered measurement
  • F 0 is set to M 1 when the first measurement is received from the physical layer (L1).
  • a 1/2 (ki/4) , where k i is the filter coefficient (filterCoefficient) of the corresponding measurement of the ith QuantityConfigNR in the quantityConfigNR-List, where i is indicated by the quantityConfigIndex in MeasObjectNR.
  • a 1/2 (k/4) , where k is the filter coefficient of the corresponding measurement received by the quantityConfig.
  • the L3 filter 13 adapts the filter so that its time characteristics are preserved at different input rates, while assuming a sample rate where the filter coefficient k is equal to X milliseconds.
  • the value of X corresponds to one intra-frequency L1 measurement period assuming non-DRX operation and is frequency range dependent.
  • the evaluation unit 14 evaluates whether an L3 measurement report D to the gNB 200 is necessary. This evaluation can be made based on a comparison of multiple measurement flows, e.g., different measurement values, at reference point C. This is shown by input C and input C1 .
  • the evaluation unit 14 performs an event evaluation corresponding to the reporting criteria at least each time a new measurement result is reported at points C and C1 .
  • the reporting criteria setting is provided by RRC signaling from the gNB 200.
  • the L3 measurement report D represents measurement report information (RRC message) sent from the UE 100 to the gNB 200.
  • the L3 measurement report D includes the measurement ID of the associated measurement setting that triggered the report.
  • the L3 beam filter 15 performs beam-wise filtering on the k measurements A 1 (i.e., beam-specific measurements) and outputs k measurements E (i.e., beam-specific measurements) to the beam selector 16.
  • the measurements E are used as input to select the X measurements to be reported.
  • the beam selection unit 16 selects X measurement values F from the k measurement values E and outputs the X measurement values F.
  • the X measurement values F are beam measurement information included in the measurement report information (RRC message) transmitted from E100 to gNB200.
  • the RRC information element QuantityConfigNR contains a list of QuantityConfigNRs.
  • Each QuantityConfigNR contains a QuantityConfigRS.
  • QuantityConfigRS contains a FilterConfig.
  • the mobile communication system 1 supports LTM (L1/L2-triggered mobility).
  • a serving cell switch is triggered by signaling in the higher layer, L3, specifically the RRC layer.
  • L3 handover an L3 Measurement Report message, which is an RRC message, is sent from UE100 to gNB200, and gNB200 decides to handover UE100 based on the Measurement Report message, and instructs UE100 to switch cells by sending a handover command, which is an RRC message (specifically, an RRC Reconfiguration message), from gNB200 to UE100.
  • LTM is a technology for reducing mobility delays (specifically, serving cell switching delays) compared to conventional handover procedures by triggering a serving cell switch through signaling at the lower layers, Layer 1 (L1) and/or Layer 2 (L2).
  • L1 Layer 1
  • L2 Layer 2
  • gNB200 receives an L1 measurement report from UE100, and based on that, gNB200 signals a cell switching command to UE100 via MAC CE to instruct the UE100 to switch the serving cell.
  • gNB200 prepares an LTM candidate cell configuration for a candidate cell to which to switch, and provides the LTM candidate cell configuration to UE100 via RRC signaling.
  • gNB200 receives an L1 measurement report from UE100, determines a serving cell switch to the target cell based on the L1 measurement report, and transmits a cell switch command (Cell Switch Command) indicating the target cell (LTM candidate cell setting) to UE100 via MAC CE.
  • Cell Switch Command Cell Switch Command
  • the serving cell switch trigger is transmitted via MAC CE that includes at least a candidate setting index along with a beam indicator.
  • UE100 switches the serving cell in response to a cell switching command from gNB200 (source cell).
  • Each LTM candidate cell configuration can be provided as a differential configuration (delta configuration) relative to the reference configuration used to form the complete candidate cell configuration.
  • a reconfiguration procedure involves replacement, but does not necessarily reset the MAC, RLC, or PDCP layers.
  • Figure 8 shows an example of a cell switching procedure using LTM.
  • UE100 switches its serving cell from the first cell of gNB200 to the second cell.
  • step S3 gNB200 decides to use LTM based on the Measurement Report message and begins preparing the candidate cell.
  • gNB200 transmits an RRC Reconfiguration message to UE100, including LTM candidate cell configurations (LTM Candidate Configurations) for one or more candidate cells.
  • the candidate cell configurations may include random access channel (RACH) configurations used for transmitting RA preambles to the corresponding candidate cells, such as contention-free random access (CFRA) configurations.
  • RACH random access channel
  • CFRA contention-free random access
  • Such RACH configurations may be referred to as early UL synchronization configurations (EarlyUlSyncConfig).
  • CFRA is a random access procedure in which UE100 is assigned dedicated RACH resources (e.g., dedicated preamble sequences and/or dedicated time-frequency resources), and no RACH contention occurs between UE100.
  • step S5 UE100 saves the LTM candidate cell setting and sends an RRC Reconfiguration Complete message to gNB200.
  • the PDCCH order may include a cell indicator indicating the corresponding RACH transmission cell, i.e., the candidate cell to which UE100 should transmit a random access preamble (RA preamble).
  • RA preamble random access preamble
  • UE100 transmits an RA preamble to the designated candidate cell.
  • UE100 does not receive a random access response (RAR) from the candidate cell for the purpose of acquiring a TA value.
  • RAR random access response
  • the TA value of the candidate cell (target cell) is indicated in the cell switching command in step S9.
  • the TA value is a value used to adjust the uplink transmission timing of UE100.
  • step S8 gNB200 decides to switch the serving cell to the target cell (second cell).
  • step S9 gNB200 transmits a cell switching command (MAC CE) including the candidate configuration index of the target cell to UE100.
  • the cell switching command may include the TA value obtained by early synchronization.
  • step S10 UE 100 switches to the target cell configuration. Specifically, UE 100 detaches from the source cell (first cell) and applies the target cell configuration.
  • step S11 if the serving cell switch needs to include the execution of a random access procedure (for example, if the cell switch command does not contain a valid TA value), UE100 executes a random access procedure for the target cell (RACH (Random Access Channel)-based LTM cell switch). Note that if UE100 does not need to acquire the TA of the target cell when switching the serving cell (for example, if the cell switch command contains a valid TA value), it can skip the random access procedure (RACH-less LTM cell switch).
  • RACH Random Access Channel
  • step S12 UE 100 indicates that the serving cell switch to the target cell has been successfully completed. UE 100 may then perform steps S6 to S12 multiple times for subsequent LTM serving cell switches based on the configuration provided in step S4.
  • C-LTM conditional LTM
  • gNB200 sets the execution conditions (trigger conditions, CondEvent), which are the radio quality conditions for LTM cell switching, in advance in UE100 using the RRC Reconfiguration message in step S4.
  • UE100 performs cell switching using LTM (also referred to as "LTM cell switching") when the radio quality conditions are met.
  • LTM also referred to as "LTM cell switching”
  • MAC CE Cell Switch Command
  • LTM may be interpreted as conditional LTM (C-LTM).
  • the mobile communication system 1 supports SON (Self-Organizing Network).
  • SON is a technology that automatically optimizes network 5 parameters, particularly gNB 200 configuration parameters.
  • SON includes MRO (Mobility Robustness Optimization) and RACH optimization.
  • MRO is a technology for adjusting handover-related parameters to minimize handover failures.
  • RACH optimization is a technology for adjusting RACH-related parameters to improve the probability of successful access and reduce access delays.
  • MDT Minimization of Drive Tests
  • MDT is a technology for collecting measurement information and location information for network optimization from UE 100 to reduce the need for manual drive tests.
  • Functions in this technology include, for example, Immediate MDT, Logged MDT, Handover Failure (HOF) reporting, and Successful Handover Report (SHR).
  • UE100 in an RRC connected state performs radio quality measurements and reports the measurement results to network 5 (gNB200) along with location information indicating the geographical location of UE100.
  • network 5 gNB200
  • location information indicating the geographical location of UE100.
  • measurement configuration and reporting procedures for L3 handover are applied, and UE100 transmits an RRC message (L3 measurement report) including location information to network 5.
  • UE100 in RRC idle state or RRC inactive state measures radio quality and records the measurement results together with UE100's location information as log information.
  • UE100 transmits an RRC message (UE Information Response message) containing the log information in response to a request from network 5.
  • RRC message UE Information Response message
  • UE100 In SHR, when a handover is barely successful, UE100 records related information (including radio quality measurement results) as log information, and then transmits an RRC message (UE Information Response message) including the log information in response to a request from network 5.
  • RRC message UE Information Response message
  • a barely successful handover generally means that the handover is successful but there is still room for optimization, for example, a situation in which the handover is successful just before various timers related to the handover expire.
  • These functions enable the network 5 to collect information from the UE 100 to automatically adjust various parameters and perform network optimization.
  • UE 100 reports one measurement value (i.e., L3 measurement value) after L3 filtering for each cell (serving cell and/or neighboring cell). For example, in MDT, UE 100 associates one L3 measurement value for each cell (serving cell and/or neighboring cell) with one piece of location information and reports it to network 5. Also, in HOF reporting, UE 100 reports only one L3 measurement value for each cell (serving cell and/or neighboring cell) at the time of HOF occurrence.
  • L3 measurement value i.e., L3 measurement value
  • MDT UE 100 associates one L3 measurement value for each cell (serving cell and/or neighboring cell) with one piece of location information and reports it to network 5.
  • HOF reporting UE 100 reports only one L3 measurement value for each cell (serving cell and/or neighboring cell) at the time of HOF occurrence.
  • LTM Low-speed cell switching decisions using L1 measurement reports, which allows cell switching decisions to follow instantaneous fluctuations in the radio environment (radio quality).
  • Cell switching decisions that respond to such instantaneous fluctuations are thought to be particularly effective in environments with severe fading and/or shadowing, such as FR (Frequency Range) 2.
  • UE 100 reports only one L3 measurement value per cell, making it difficult for network 5 to grasp the instantaneous fluctuations in the radio environment (radio quality), making it difficult to perform network optimization related to LTM. For example, if the timing of sending a cell switching command from gNB 200 cannot be optimized, it will be unable to keep up with instantaneous fluctuations, increasing the likelihood of cell switching failure (e.g., cell switching that is too late).
  • Figure 9 is a diagram showing the operation of UE 100 according to this embodiment.
  • UE100 derives multiple measurement values corresponding to one cell by repeatedly performing wireless quality measurements for one cell in Layer 1 (L1).
  • each of the multiple measurement values is an L1 measurement value to which L3 filter 13 has not been applied.
  • the wireless quality measurement may be a measurement of the received power of a synchronization signal (SS-RSRP: SS Reference Signal Received Power) or a measurement of the received power of a channel state information reference signal (CSI-RSRP: CSI Reference Signal Received Power).
  • SS-RSRP SS Reference Signal Received Power
  • CSI-RSRP CSI Reference Signal Received Power
  • L1 measurement value is not limited to L1-RSRP, but may be other L1 measurement results (for example, CSI such as RSRQ (Reference Signal Received Quality), SINR (Signal-to-Interference-plus-Noise Ratio), or CQI (Channel Quality Indicator)).
  • CSI such as RSRQ (Reference Signal Received Quality), SINR (Signal-to-Interference-plus-Noise Ratio), or CQI (Channel Quality Indicator)).
  • UE100 In step S102, UE100 generates an RRC message including multiple L1 measurement values corresponding to one cell obtained in step S101.
  • the RRC message may include an L1 measurement list in which multiple L1 measurement values are configured in list format.
  • the RRC message may include location information indicating the geographical location of UE100 and multiple L1 measurement values (L1 measurement list) associated with the location information.
  • the RRC message may include a set of cell IDs and L1 measurement list for each of multiple cells (e.g., the serving cell and neighboring cells including LTM candidate cells). Note that each entry (L1 measurement value) in the L1 measurement value list may use the L1 measurement value as is, or may be an index value obtained by quantizing the L1 measurement value.
  • Each entry (L1 measurement value) in the L1 measurement value list may be a difference value (offset value) based on one L1 measurement value.
  • UE100 transmits the RRC message obtained in step S102 to network 5 (gNB200).
  • Network 5 receives the RRC message.
  • the RRC message may be a Measurement Report message or a UE Information Response message.
  • the Measurement Report message may be a Measurement Report message used in Immediate MDT.
  • the UE Information Response message may be a UE Information Response message used to transmit logged MDT, HOF report, or SHR log information.
  • the UE 100 that performs this type of operation has a control unit 130 that derives multiple measurement values corresponding to one cell by repeatedly measuring the radio quality of one cell on L1, and generates an RRC message including the multiple measurement values corresponding to one cell, and a transmission unit 120 that transmits the RRC message to the network 5.
  • the gNB 200 has a reception unit 220 that receives the RRC message.
  • the first operation pattern is an operation pattern that mainly assumes immediate MDT and logged MDT (also simply referred to as "MDT").
  • the measurement results reported by UE 100 to network 5 are L3 measurement values after L3 filtering.
  • UE 100 transmits an L3 Measurement Report message to network 5, which includes location information and one measurement value per measurement cell.
  • the time interval (periodicity) for the L3 measurement report is set by network 5 to UE 100, and is set to 120 ms or more according to the 3GPP technical specifications.
  • UE100 records location information, a timestamp, and one measurement value per measurement cell as log information (also referred to as "logging") and transmits a UE Information Response message including the log information to network 5.
  • the logging interval is set by network 5 to UE100, and is set to 320 ms or more according to the 3GPP technical specifications.
  • the low resolution of wireless quality measurement data i.e., the long period on the time axis and averaging due to L3 filtering, become problems.
  • UE100 performs radio quality measurements in L1 at time intervals shorter than the L3 measurement reporting time interval (periodicity) and the logging time interval (logging interval) to derive L1 measurement values. Therefore, in the first operation pattern, UE100 reports to network 5 the L1 measurement values derived at such short time intervals (specifically, L1 measurement values to which L3 filtering has not been applied).
  • UE100 transmits to network 5 an RRC message that includes location information (and a timestamp in the case of logged MDT) and an L1 measurement value list associated with the location information. This makes it possible to associate multiple L1 measurement values with one piece of location information (and one timestamp), thereby reducing overhead.
  • UE 100 reports L1 measurement values in list form to network 5. Specifically, UE 100 reports an L1 measurement value list for one cell to network 5, associated with one piece of location information (and one timestamp).
  • the network 5 transmits configuration information to the UE100 for configuring the UE100 to perform at least one of MDT measurement, reporting, and logging.
  • the UE100 receives the configuration information from the network 5.
  • the configuration information includes information for setting a measurement interval, which is the time interval at which the UE100 performs radio quality measurements (at least one of MDT measurement, reporting, and logging).
  • the information for setting the measurement interval includes information indicating a reference measurement interval and information indicating how many times radio quality measurements should be performed within the reference measurement interval.
  • the network 5 configures the UE100 with respect to the conventional measurement/reporting/logging interval how many L1 measurements to report/log within the interval.
  • Figure 10 is a diagram showing an example of a first operation pattern of an embodiment. Here, we will explain using logged MDT as an example.
  • Figure 11 is a diagram for explaining a Logged Measurement Configuration message related to the first operation pattern.
  • Figure 12 is a diagram for explaining a UE Information Response message related to the first operation pattern.
  • step S201 UE100 is in an RRC connected state in a cell of network 5 (gNB200).
  • step S202 network 5 (gNB200) sends a Logged Measurement Configuration message, which is an RRC message including configuration information for configuring logged MDT measurements and logging, to UE100.
  • UE100 receives the Logged Measurement Configuration message.
  • the Logged Measurement Configuration message includes a setting for the logging period (LoggingInterval).
  • the Logged Measurement Configuration message further includes information indicating the number of divisions of the logging period (IntervalDivision). This information may be the number of entries in the L1 measurement result list. Note that instead of (or in addition to) the number of divisions of the logging period, the acquisition period for the L1 measurement results (i.e., the storage period for entries in the L1 measurement result list) may be used.
  • step S203 UE 100 transitions from the RRC connected state to the RRC idle state or the RRC inactive state.
  • step S204 UE100 starts periodic logging of L1 measurement results in accordance with the contents set in the Logged Measurement Configuration message. If an event is set in the Logged Measurement Configuration message, UE100 may start periodic logging when the event is satisfied as a trigger.
  • UE100 may perform L1 measurements at a period determined by "measurement period (Logging Interval) / division number information (Interval Division)" and log the L1 measurement values. As shown in FIG. 12, UE100 stores one L1 measurement report result (resultsSSB-Cell) in each entry of the list (resultsSSB-Cell-L1MeasList) that contains the L1 measurement results. One piece of location information (locationInfo) and one timestamp (relativeTimeStamp) are associated with the list.
  • locationInfo location information
  • timestamp relativeTimeStamp
  • step S205 UE100 sends a notification (Availability Indicator) to network 5 (gNB200) indicating that it is holding log information.
  • Network 5 (gNB200) receives the notification (Availability Indicator).
  • UE100 may include the notification (Availability Indicator) in an RRC Setup Complete message and send it to network 5 (gNB200).
  • the UE 100 may include a notification (Availability Indicator) in an RRC Resume Complete message and send it to the network 5 (gNB 200).
  • the UE 100 may send a notification (Availability Indicator) to the network 5 (gNB 200) when RRC is re-established or when handover is successful.
  • step S206 UE100 transitions to the RRC connected state.
  • step S207 network 5 (gNB200) sends a message (UE Information Request message) to UE100 requesting the transmission of log information.
  • UE100 receives the message (UE Information Request message).
  • UE100 transmits a message (UE Information Response message or another RRC message) including log information to network 5 (gNB200).
  • Network 5 (gNB200) receives the message.
  • Network 5 (gNB200) may acquire the log information in the message and transmit the acquired log information to CN20 or OAM (Operations, Administration, Maintenance).
  • Network 5 may optimize various network parameters related to LTM based on the log information.
  • logged MDT has been used as an example, but such operation may also be applied to immediate MDT.
  • UE100 performs measurements and reports while maintaining the RRC connected state. Also, the above-mentioned setting information is replaced with measurement setting, the logging interval is replaced with reporting interval (periodicity, Report Interval), and the UE Information Response message is replaced with Measurement Report message.
  • the second operation pattern will be described, focusing mainly on differences from the first operation pattern.
  • the second operation pattern is an operation pattern that mainly assumes HOF reporting and SHR.
  • the UE 100 periodically performs measurement reporting or logging.
  • the UE 100 performs logging only once when a predetermined event (e.g., cell switching failure or cell switching success) occurs.
  • a predetermined event e.g., cell switching failure or cell switching success
  • UE 100 reports to network 5 the L3 measurement results at the time of event occurrence in a snapshot. For example, UE 100 reports to network 5 only one L3 measurement result for each of the serving cell and neighboring cell at the time of HOF occurrence.
  • LTM LTM
  • gNB200 decides to switch LTM cells based on L1 measurement reports.
  • UE100 performs L1 measurements at short intervals, and the L1 measurement values vary greatly from measurement to measurement. Therefore, time series data of L1 measurement values over a certain period when an event occurs can be useful for performing network optimization related to LTM.
  • UE100 records time-series data of L1 measurement values for a certain period before and after the occurrence of an event as log information. Specifically, UE100 detects an event related to a serving cell switch, records multiple L1 measurement values (L1 measurement value list) for a certain period before and/or after the occurrence of the event as log information, generates an RRC message (UE Information Response message) including the log information, and transmits the RRC message to network 5 (gNB200).
  • the event may be any of the following: a cell switch has failed, a cell switch has been successful, or a trigger condition for a cell switch has been met.
  • FIG. 13 is a diagram showing an example of a second operation pattern of an embodiment.
  • FIG. 14 is a diagram for explaining HOF reporting related to the second operation pattern.
  • FIG. 15 is a diagram for explaining SHR related to the second operation pattern. While LTM cell switching is primarily assumed here, L3 handover may also be assumed.
  • step S301 UE100 is in an RRC connected state in a cell of network 5 (gNB200).
  • network 5 may transmit an RRC message (RRC Reconfiguration message) including configuration information for configuring the HOF report and/or SHR to UE100.
  • RRC message RRC Reconfiguration message
  • UE100 may receive the RRC message.
  • the setting information may include settings for logging events and/or settings for logging periods.
  • the logging event setting is information that specifies the event that should be logged.
  • the specified event may be at least one of a successful cell switch and a failed cell switch.
  • the specified event may also be the satisfaction of a trigger condition for cell switch.
  • the measurement start trigger may be either Early TA (i.e., when CFRA is executed and/or when UE-based TA measurement is executed), a radio quality threshold (for example, when the RSRP of the serving cell falls below a threshold and/or when the RSRP of an LTM candidate cell and/or neighboring cell exceeds a threshold, or an existing Event A3 trigger condition, etc.).
  • a radio quality threshold for example, when the RSRP of the serving cell falls below a threshold and/or when the RSRP of an LTM candidate cell and/or neighboring cell exceeds a threshold, or an existing Event A3 trigger condition, etc.
  • UE100 provisionally retains L1 measurement results, it sequentially stores the L1 measurement results in internal variables (list entries).
  • UE100 may sequentially delete L1 measurement results that exceed the logging period (a certain period in the past) from the internal variables (list entries).
  • past L1 measurement results may be extracted from the internal variables, stored in the L1 measurement value list, and reported to the network.
  • the logging period setting may include information indicating a certain period in the past and/or information indicating a certain period in the future, based on the time when the logging event is satisfied.
  • UE100 triggers (attempts) cell switching.
  • UE100 may trigger cell switching in response to receiving a cell switching command from network 5 (gNB200).
  • gNB200 may trigger cell switching in response to the trigger condition set by network 5 (gNB200) being satisfied.
  • step S304 UE100 detects the occurrence of a logging event.
  • the logging event is set by network 5 (gNB200) and may be at least one of a successful cell switch and a failed cell switch.
  • the logging event may also be the satisfaction of a trigger condition for cell switch.
  • the log information may further include information indicating the event type.
  • the information indicating the event type may be information indicating the success or failure of the LTM cell switching (the state at the time the LTM procedure is completed).
  • This information may be procedure-specific information, such as L3 handover or LTM.
  • This information may be function-specific information, such as a C-LTM execution trigger or a CHO execution trigger.
  • This information may also be event details (trigger type, such as an A3 trigger).
  • UE100 may include an L1 measurement list as the measurement result of the serving cell (measResultLastServCell) in the log information. UE100 may also include an L1 measurement list in each entry of the list of measurement results of neighboring cells (measResultListNR).
  • UE100 may set "hof” as the connection failure type (connectionFailureType) in the log information.
  • UE100 may also set "LTM” (or "C-LTM”) as the type of failed handover (lastHO-Type).
  • UE100 may set information specific to LTM cell switching as the cause (rlf-Cause) of radio link failure (RLF) due to LTM cell switching in the log information (see the third modification example described below).
  • UE100 may include an L1 measurement list as the measurement result of the source cell (sourceCellMeas) in the log information.
  • UE100 may also include an L1 measurement list as the measurement result of the target cell (targetCellMeas).
  • UE100 may include an L1 measurement list as the measurement result of a candidate cell (LTM candidate cell, C-LTM candidate cell, CHO candidate cell, CPAC candidate cell, etc.). If there are multiple candidate cells, an L1 measurement list may be included for each candidate cell.
  • an L1 measurement list may also be included for a cell that did not become a target cell (a cell corresponding to a candidate cell setting held other than the target cell setting applied by UE100). Note that if the cell switching is successful, UE100 may set "LTM" (or "C-LTM”) as the type of successful handover in the log information.
  • step S306 if the cell switching fails, the UE 100 may transition to the RRC idle state.
  • UE100 sends a notification (Availability Indicator) to network 5 (gNB200) indicating that it is holding log information.
  • Network 5 (gNB200) receives the notification (Availability Indicator).
  • UE100 may include the notification (Availability Indicator) in an RRC Setup Complete message and send it to network 5 (gNB200) when transitioning from the RRC idle state to the RRC connected state.
  • the UE 100 may include a notification (Availability Indicator) in an RRC Resume Complete message and send it to the network 5 (gNB 200).
  • the UE 100 When the UE 100 is in the RRC connected state, it may send a notification (Availability Indicator) to the network 5 (gNB 200) when RRC is re-established or when handover is successful.
  • step S308 UE 100 may transition to the RRC connected state.
  • step S309 network 5 (gNB200) sends a message (UE Information Request message) to UE100 requesting the transmission of log information.
  • UE100 receives the message (UE Information Request message).
  • UE100 transmits a message (UE Information Response message or another RRC message) including log information to network 5 (gNB200).
  • Network 5 (gNB200) receives the message.
  • Network 5 (gNB200) may acquire the log information in the message and transmit the acquired log information to CN20 or OAM.
  • Network 5 may optimize various network parameters related to LTM based on the log information.
  • HOF reporting and SHR are primarily assumed, and an example has been described in which, when a predetermined event for logging (e.g., handover failure or handover success) occurs, UE100 includes in the log information multiple L1 measurement results (L1 measurement value list) for a certain period before and after the event. In contrast, in the modified example, when the event occurs, UE100 includes in the log information information related to LTM cell switching, which is information different from the L1 measurement value list.
  • a predetermined event for logging e.g., handover failure or handover success
  • UE100 records log information including information about LTM cell switching in response to detecting an event (logging event) related to LTM cell switching.
  • the logging event is set by network 5 (gNB200) and may be at least one of a successful cell switch and a failed cell switch.
  • the logging event may also be that a trigger condition for cell switching has been satisfied.
  • the log information may include information about the source cell (cell ID, measurement results, etc.) and/or information about the target cell (cell ID, measurement results, etc.).
  • the log information includes information regarding the optimal cell switching timing estimated by UE100, and/or information indicating the time from when UE100 detects a reporting event of a measurement report for LTM cell switching to when the measurement report is transmitted to network 5.
  • the log information includes at least one of information indicating whether UE-based TA measurement, in which UE100 itself derives the TA value to be applied to the target cell of the LTM cell switching, was successful, information regarding the TA value applied to the target cell, and information indicating whether the random access procedure performed for the target cell was contention-free random access (CFRA) or contention-based random access (CBRA).
  • CFRA contention-free random access
  • CBRA contention-based random access
  • step S402 UE 100 transmits an RRC message including log information to network 5 (gNB 200).
  • the RRC message may be a UE Information Response message.
  • RRC settings including trigger conditions etc. are configured for UE 100 from network 5 (gNB 200), but UE 100 erases the settings when it successfully accesses the target cell. Therefore, in order to perform the next CHO/CPAC etc., it is necessary to perform RRC reconfiguration (RRC Reconfiguration) from network 5 (gNB 200) to UE 100.
  • RRC Reconfiguration RRC reconfiguration
  • the network 5 (gNB200) to reconfigure the RRC settings for the UE 100.
  • the network 5 cannot determine whether the cell switch failure/success was the failure/success of the first cell switch or the failure/success of the subsequent LTM cell switch, which makes it difficult to perform network optimization for the subsequent LTM.
  • UE100 when a logging event (cell switching failure/success) occurs during a subsequent cell switching, UE100 includes information indicating that this is a subsequent cell switching in the log information.
  • step S301 UE100 is in an RRC connected state in a cell of network 5 (gNB200).
  • network 5 may transmit an RRC message (RRC Reconfiguration message) to UE100, which includes configuration information for configuring an HOF report and/or SHR.
  • UE100 may receive the RRC message.
  • the configuration information may include a logging event configuration.
  • the logging event configuration is information that specifies the events that should be logged.
  • the specified event may be at least one of a successful cell switch and a failed cell switch.
  • the specified event may be that a trigger condition for cell switch has been satisfied.
  • the configuration information may include information that configures logging for a subsequent LTM.
  • UE100 triggers (attempts) a subsequent LTM cell switch.
  • the subsequent LTM cell switch is an operation of performing an LTM cell switch without RRC reconfiguration from network 5 after an LTM cell switch based on the RRC configuration from network 5 (the LTM candidate cell configuration in step S4 of FIG. 8).
  • UE100 performs (attempts) a subsequent LTM cell switch by reusing the RRC configuration (LTM candidate cell configuration) from network 5.
  • UE100 retains the LTM candidate cell configuration, and performs (attempts) an LTM cell switch based on the LTM candidate cell configuration in response to receiving a cell switch command from the serving cell.
  • the log information includes information indicating a subsequent LTM cell switch.
  • the information may be 1-bit information (true/false) indicating the failure/success of the subsequent LTM cell switch.
  • the information may also be information indicating the number of times the subsequent LTM cell switch has failed/succeeded (e.g., "second time”). For example, if the subsequent LTM cell switch fails, UE100 may set "hof” as the connection failure type (connectionFailureType) in the log information. UE100 may set "subsequent LTM” as the type of the failed handover (lastHO-Type). If the subsequent LTM cell switch is successful, UE100 may set "subsequent LTM” as the type of the successful handover in the log information.
  • the network 5 issues a cell switching instruction to the UE 100 by a cell switching command based on the L1 measurement report (see steps S7 to S9 in FIG. 8 ). Since the LTM aims to respond to instantaneous fluctuations in the radio environment, there is a risk that a cell switching failure (particularly, a cell switching that is too late) will occur because the transmission timing of the cell switching command from the network 5 is not able to keep up with the fluctuations in the radio environment.
  • an event-triggered L1 measurement report may be configured in UE100 by network 5.
  • a trigger condition (reporting event) for an L1 measurement report is configured in UE100 by network 5, and UE100 transmits an L1 measurement report to network 5 when the configured trigger condition is satisfied (the configured reporting event occurs).
  • the configured reporting event occurs.
  • UE100 includes in the log information information regarding the optimal cell switching timing estimated by UE100, and/or information indicating the time (i.e., delay time) from when UE100 detects a reporting event of the L1 measurement report until when it transmits the L1 measurement report to network 5.
  • step S301 UE100 is in an RRC connected state in a cell of network 5 (gNB200).
  • network 5 may transmit an RRC message (RRC Reconfiguration message) including configuration information for configuring an HOF report and/or SHR to UE100.
  • UE100 may receive the RRC message.
  • the configuration information may include a logging event configuration.
  • the logging event configuration is information that specifies the events that should be logged.
  • the specified event may be at least one of a successful cell switch and a failed cell switch.
  • the specified event may be that a trigger condition for cell switch is satisfied.
  • the RRC message may include information for configuring logging of the optimal cell switching timing and/or the delay time of the L1 measurement report.
  • the configuration information may include information for configuring model inference using an AI/ML model for deriving the optimal cell switching timing, for example, the model ID or function ID of the AI/ML model.
  • the AI/ML model may be an AI/ML model that derives the optimal cell switching timing based on L1 measurement results.
  • UE 100 may estimate the optimal cell switching timing using the AI/ML model.
  • the RRC message may include information for setting a trigger condition (event) for transmitting an L1 measurement report to the network 5 (gNB200).
  • UE100 may trigger an LTM cell switch by transmitting an L1 measurement report to the network 5 (gNB200) in response to the occurrence of the event, and receiving a cell switch command from the network 5 (gNB200).
  • step S303 UE100 triggers (attempts) LTM cell switching.
  • step S304 UE 100 detects the occurrence of a logging event.
  • the logging event may be at least one of a successful LTM cell switch and a failed LTM cell switch.
  • step S305 UE100 generates log information in response to the occurrence of a logging event and records the log information.
  • the log information may include information indicating the optimal cell switching timing estimated by UE100.
  • the information indicating the optimal cell switching timing may be the absolute time of the optimal cell switching timing.
  • the information may also be relative time (offset time based on the time when the cell switching command is actually received). This time information may be expressed in terms of radio frames (SFN), slots, or symbols.
  • the log information may also include radio quality measurements (such as RSRP) of the radio environment, for example, the serving cell and/or neighboring cells.
  • RSRP radio quality measurements
  • the log information may include a measurement of the delay time from the timing of the L1 measurement report event trigger (start timing) to the completion of transmission of the L1 measurement report (end timing).
  • LTM cell switching has been described, but the operation according to this modified example may also be applied to L3 handover.
  • an L3 measurement report may be used instead of an L1 measurement report.
  • the timing for ending measurement of the delay time may be the timing when UE100 receives a delivery acknowledgement (ACK) for the L3 measurement report from network 5 (gNB200).
  • ACK delivery acknowledgement
  • the third modification is an embodiment related to UE-based TA measurement in LTM.
  • the UE 100 itself derives a TA value to be applied to a target cell of LTM cell switching.
  • gNB200 can request UE100 to perform early TA acquisition for the candidate cell before cell switching.
  • the early TA acquisition procedure is achieved by CFRA triggered by a PDCCH order as described above, or by UE-based TA measurements configured by RRC.
  • the gNB200 to which the candidate cell belongs calculates the TA value and transmits it to the gNB200 to which the serving cell belongs.
  • the serving cell triggers an LTM cell switch, it transmits the TA value in the cell switch command (MAC CE).
  • UE100 performs TA measurement of candidate cells after being configured by RRC, but the exact time at which UE100 performs TA measurement depends on the implementation of UE100.
  • UE100 receives a cell switch command, it applies the TA value it measured and performs RACH-less LTM.
  • UE100 performs either a RACH-less LTM cell switch or a RACH-based LTM cell switch. If a TA value is specified in the cell switch command, UE100 applies the TA value according to the specification. If UE-based TA measurement is configured but a TA value is not specified in the cell switch command, UE100 applies its own measured TA value, if available. If a valid TA value is not available, UE100 performs a RACH-based LTM cell switch.
  • UE-based TA measurements can be configured in UE 100.
  • network 5 cannot determine whether UE-based TA measurements were successful, making it difficult to perform network optimization related to LTM (for example, optimizing whether or not UE-based TA measurements are configured and their content).
  • the network 5 cannot determine what TA value the UE 100 has applied to the target cell, making it difficult to perform network optimization related to LTM.
  • UE 100 may perform RACH-based LTM cell switching. In this case, UE 100 performs either a CFRA or CBRA type of random access procedure with respect to the target cell.
  • UE 100 performs either a CFRA or CBRA type of random access procedure with respect to the target cell.
  • UE100 includes in the log information at least one of information indicating whether the UE-based TA measurement was successful, information regarding the TA value applied to the target cell, and information indicating whether the random access procedure performed for the target cell was CFRA or CBRA.
  • step S301 UE100 is in an RRC connected state in a cell of network 5 (gNB200).
  • network 5 may transmit to UE100 an RRC message (RRC Reconfiguration message) including configuration information for configuring an HOF report and/or SHR.
  • the RRC message may include information for configuring UE-based TA measurement.
  • UE100 may receive the RRC message.
  • the configuration information may include a logging event configuration.
  • the logging event configuration is information specifying an event to be logged.
  • the specified event may be at least one of a successful cell switch and a failed cell switch.
  • the specified event may be that a trigger condition for cell switch has been satisfied.
  • the configuration information may include information for configuring the recording of at least one of information indicating whether the UE-based TA measurement was successful, information regarding the TA value applied to the target cell, and information indicating whether the random access procedure performed for the target cell was CFRA or CBRA.
  • step S303 UE 100 performs UE-based TA measurements and receives a cell switch command from network 5, thereby triggering (attempting) an LTM cell switch.
  • the LTM cell switch is either a RACH-less LTM cell switch or a RACH-based LTM cell switch.
  • step S304 UE 100 detects the occurrence of a logging event.
  • the logging event may be at least one of a successful LTM cell switch and a failed LTM cell switch.
  • the LTM (and conditional LTM) has been mainly described.
  • the operations according to the above-described embodiments may be applied to L3 handover (and conditional L3 handover).
  • an L3 measurement list consisting of a plurality of L3 measurement values may be used instead of an L1 measurement list consisting of a plurality of L1 measurement values.
  • the operations may be applied to addition or modification of a primary/secondary cell (PSCell), or to conditional PSCell addition or conditional PSCell modification.
  • PSCell primary/secondary cell
  • PSCell primary/secondary cell
  • the base station is an NR base station (gNB), but the base station may also be an LTE base station (eNB) or a 6G base station.
  • the base station may be a relay node such as an IAB (Integrated Access and Backhaul) node.
  • the base station may also be a DU of an IAB node.
  • UE100 may be an MT (Mobile Termination) of an IAB node.
  • UE100 may be a terminal function unit (a type of communication module) that allows the base station to control a repeater that relays signals.
  • Such a terminal function unit is referred to as an MT.
  • IAB-MT other examples of MT include NCR (Network Controlled Repeater)-MT and RIS (Reconfigurable Intelligent Surface)-MT.
  • network node primarily refers to a base station, but may also refer to a core network device or part of a base station (CU, DU, or RU).
  • a network node may also be composed of a combination of at least part of a core network device and at least part of a base station.
  • a program may be provided that causes a computer to execute each process performed by UE100 or gNB200.
  • the program may be recorded on a computer-readable medium.
  • the computer-readable medium can be used to install the program on a computer.
  • the computer-readable medium on which the program is recorded may be a non-transitory recording medium.
  • the non-transitory recording medium is not particularly limited, but may be, for example, a CD-ROM and/or DVD-ROM.
  • circuits that execute each process performed by UE100 or gNB200 may be integrated, and at least a portion of UE100 or gNB200 may be configured as a semiconductor integrated circuit (chipset, SoC: System on a chip).
  • UE100 or gNB200 may be implemented in circuitry or processing circuitry, including general-purpose processors, application-specific processors, integrated circuits, ASICs (Application Specific Integrated Circuits), CPUs (Central Processing Units), conventional circuits, and/or combinations thereof, programmed to perform the described functions.
  • a processor includes transistors and/or other circuits and is considered to be circuitry or processing circuitry.
  • a processor may also be a programmed processor that executes a program stored in memory.
  • circuitry, unit, or means refers to hardware that is programmed to perform the described functions or that executes them.
  • the hardware may be any hardware disclosed herein or any hardware known to be programmed or capable of performing the described functions. If the hardware is a processor, which is considered a type of circuitry, the circuitry, means, or unit is a combination of hardware and software used to configure the hardware and/or processor.
  • the terms “based on” and “depending on/in response to” do not mean “based only on” or “depending only on,” unless expressly stated otherwise.
  • the term “based on” means both “based only on” and “based at least in part on.”
  • the term “depending on” means both “depending only on” and “depending at least in part on.”
  • the terms “include,” “comprise,” and variations thereof do not mean including only the listed items, but may mean including only the listed items or including additional items in addition to the listed items. Additionally, the term “or,” as used in this disclosure, is not intended to mean an exclusive or.
  • 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 herein as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein, or that the first element must precede the second element in some way.
  • articles are added by translation, such as a, an, and the in English, these articles shall include the plural unless the context clearly indicates otherwise.
  • ⁇ Appendix 1 A communication method executed in a user equipment of a mobile communication system, comprising: In Layer 1 (L1), repeatedly performing radio quality measurements for a cell to derive a plurality of measurements corresponding to the cell; generating a radio resource control (RRC) message including the plurality of measurements corresponding to the one cell; and transmitting the RRC message to a network.
  • L1 Layer 1
  • RRC radio resource control
  • each of the plurality of measurements is a Layer 3 (L3) unfiltered L1 measurement.
  • ⁇ Appendix 3 The communication method according to Supplementary Note 2, wherein the RRC message includes an L1 measurement value list in which the plurality of measurement values are configured in a list format.
  • Appendix 5 The communication method according to any one of Supplementary Notes 1 to 4, wherein the radio quality measurement is measurement of received power of a synchronization signal or measurement of received power of a channel state information reference signal.
  • Appendix 6 The communication method according to any one of Supplementary Notes 1 to 5, wherein the RRC message is a Measurement Report message or a UE Information Response message.
  • Appendix 7 The user equipment receives configuration information related to the radio quality measurement from the network; The communication method according to any one of Supplementary Notes 1 to 6, wherein the setting information includes information for setting a measurement interval, which is a time interval at which the user equipment performs the wireless quality measurement.
  • Appendix 8 The communication method according to Supplementary Note 7, wherein the information for setting the measurement interval includes information indicating a reference measurement interval and information indicating how many times the wireless quality measurement should be performed within the reference measurement interval.
  • Appendix 9 The user device Detecting an event related to a serving cell switch of the user equipment; 9. The communication method according to any one of Supplementary Notes 1 to 8, wherein the RRC message is generated including the plurality of measurement values for a certain period before and/or after the occurrence of the event.
  • Appendix 10 10. The communication method of claim 9, wherein the event is one of the following: the switchover has failed, the switchover has succeeded, or a trigger condition for the switchover has been satisfied.
  • Appendix 12 A network node for use in a mobile communication system, comprising: A network node comprising: a receiver configured to receive, from a user equipment, a radio resource control (RRC) message including a plurality of measurements obtained by the user equipment repeatedly performing radio quality measurements for one cell at Layer 1 (L1).
  • RRC radio resource control
  • Mobile communication system 5 Network 10: RAN 20:CN 11: L1 filter 12: Beam combining/selection unit 13: L3 filter 14: Evaluation unit 15: L3 beam filter 16: Beam selection unit 100: UE 110: Receiving unit 120: Transmitting unit 130: Control unit 140: Wireless communication unit 200: gNB 210: Transmitting unit 220: Receiving unit 230: Control unit 240: Network communication unit 241: Transmitting unit 242: Receiving unit 250: Wireless communication unit 300: AMF/UPF

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Ce procédé de communication exécuté par un dispositif utilisateur d'un système de communication mobile consiste à : dériver une pluralité de valeurs de mesure correspondant à une cellule par réalisation répétée d'une mesure de qualité radio de la cellule dans une couche 1 (L1) ; générer un message de gestion de ressource radio (RRC) comprenant la pluralité de valeurs de mesure correspondant à la cellule ; et transmettre le message RRC à un réseau.
PCT/JP2025/004989 2024-02-14 2025-02-14 Procédé de communication, dispositif utilisateur et nœud de réseau Pending WO2025173773A1 (fr)

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Citations (1)

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Publication number Priority date Publication date Assignee Title
US20150223092A1 (en) * 2013-08-30 2015-08-06 Intel IP Corporation Measurement triggers for customer care in a wireless network

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150223092A1 (en) * 2013-08-30 2015-08-06 Intel IP Corporation Measurement triggers for customer care in a wireless network

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