WO2023005967A1 - 切换信息报告方法以及用户设备 - Google Patents

切换信息报告方法以及用户设备 Download PDF

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Publication number
WO2023005967A1
WO2023005967A1 PCT/CN2022/108213 CN2022108213W WO2023005967A1 WO 2023005967 A1 WO2023005967 A1 WO 2023005967A1 CN 2022108213 W CN2022108213 W CN 2022108213W WO 2023005967 A1 WO2023005967 A1 WO 2023005967A1
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handover
cho
cell
configuration
information
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PCT/CN2022/108213
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English (en)
French (fr)
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常宁娟
刘仁茂
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夏普株式会社
常宁娟
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the present disclosure relates to the technical field of wireless communication, and more specifically, the present disclosure relates to a handover information reporting method in a handover situation and a corresponding user equipment.
  • This disclosure proposes a solution to the problem of how to implement handover information reporting and link failure information reporting in an NR system.
  • the purpose of the embodiments of the present disclosure is to propose a solution to the problem of how to implement switching information reporting in the NR system. More specifically, the present disclosure proposes a solution to the problem of how to record handover information when UE is configured with Conditional HandOver (CHO) in the NR system.
  • Embodiments of the present disclosure provide a method for reporting handover information performed in a user equipment, a corresponding user equipment, and a communication system.
  • a method for reporting handover information including: the user equipment UE performs a traditional handover process; when the UE is configured with conditional handover CHO, the UE according to the handover target Whether the cell is a candidate cell in the CHO configuration saved by the UE is used to set the first time information in the successful handover report SHR when the handover is successful, or the second time in the radio link failure report RLF-report when the handover fails information; if the target cell to be handed over is a candidate cell in the CHO configuration saved by the UE, the first time information or the second time information is set as: the UE receives the The time elapsed between the latest CHO configuration corresponding to the candidate cell and the UE starting to execute the handover; the traditional handover process is a handover process performed by the UE immediately applying the configuration in the handover command after receiving the handover command.
  • the first time information is set as: The time elapsed between the UE receiving the latest CHO configuration and the UE starting to perform handover; when the handover fails, the second time information is set as: the UE receives the latest CHO configuration and the UE The time elapsed between the start of the switchover.
  • the first time information is set as: The time elapsed between the UE receiving the latest CHO configuration containing the candidate cell with the best signal quality and the UE starting to perform the handover; when the handover fails, the second time information is set as: the UE receives the The time elapsed between the last CHO configuration of the candidate cell with the best signal quality and the UE starting to perform handover.
  • the UE does not record the first time information
  • the UE does not record the second time information
  • the candidate cell with the best signal quality is the candidate cell with the best measurement result among the configured conditional handover candidate cells
  • the measurement result may be a reference signal received power RSRP , reference information reception quality RSRQ, signal-to-interference-plus-noise ratio SINR, or received signal strength indicator RSSI measurement results used to characterize link quality.
  • the target cell to be handed over is a candidate cell in the CHO configuration saved by the UE. It may indicate that: the cell identity of the target cell and the stored conditional reconfiguration variable VarConditionalReconfig The cell identities of the candidate cells in the synchronization reconfiguration information element reconfigurationWithSync in the MasterCellGroup information element in the are the same.
  • a method for reporting handover information including: a radio link failure RLF occurs in a user equipment UE;
  • the second time information in the path failure report RLF-report is set to any one of the following information: the time elapsed between the UE receiving the latest CHO configuration and the UE occurrence of RLF; The time elapsed between the latest CHO configuration of a good candidate cell and the occurrence of RLF in the UE; the UE does not record the second time information.
  • a user equipment UE including: a processor; and a memory storing instructions; wherein, when executed by the processor, the instructions perform handover information reporting according to the context method.
  • FIG. 1 is a schematic diagram showing a general handover process.
  • FIG. 2 is a flowchart showing a handover information reporting method in Embodiment 1 of the present disclosure.
  • FIG. 3 is a block diagram illustrating a user equipment UE involved in the present disclosure.
  • LTE Long Term Evolution
  • NR New Radio Access
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • handover refers to the change of the primary cell initiated by the network side, including the change of the primary cell between cells and the change of the primary cell within the cell, that is, the change of the primary cell of the UE from the source cell to the target cell, where the source cell It can be the same cell as the target cell or a different cell.
  • the secret key or security algorithm used for access layer security can also be updated or not updated accordingly.
  • the security includes encryption, decryption and integrity protection.
  • the source cell can also be called the source base station, or the source beam (beam), the source transmission point (Transmission point, TRP), the source main cell (Primary Cell, PCell), the source main cell group (Master Cell Group, MCG); the target A cell may also be called a target base station, or a target beam, a target transmission point, a target primary cell PCell, or a target cell group MCG.
  • the source cell refers to the cell serving the UE connected before the handover process is initiated, that is, the cell that sends a radio resource control (Radio Resource Control, RRC) message including a handover command to the UE.
  • RRC Radio Resource Control
  • the target cell refers to the cell to which the UE is connected to serve the UE after the handover process is successfully completed, the cell indicated by the target cell identifier contained in the handover command, or described as the cell performing downlink synchronization and random access during the handover process.
  • the handover mentioned in this disclosure may also refer to the change of the Primary Secondary Cell (PSCell).
  • the handover information or handover report refers to the handover information or handover report related to the PSCell.
  • the handover command described in this disclosure is used to trigger the UE to perform handover. In the NR system, it is an RRC reconfiguration message containing a synchronous reconfiguration (Reconfigurationwithsync) information element.
  • RRC reconfiguration message of the Reconfigurationwithsync) information element may also be referred to as synchronous reconfiguration of the MCG.
  • handover may also be referred to as synchronous reconfiguration of the MCG.
  • it is an RRC connection reconfiguration message including a mobility control information (MobilityControlInfo) information element.
  • the synchronous reconfiguration information element or the mobility control information element may include configuration information of the target cell, such as target cell identity, target cell frequency, public configuration of the target cell such as system information, and configuration information used by the UE to access the target cell. Random access configuration, UE security parameter configuration in the target cell, UE radio bearer configuration in the target cell, etc.
  • the RRC reconfiguration message in this disclosure is equivalent to the RRC connection reconfiguration message; similarly, the response message RRC reconfiguration complete message is identical to the RRC connection reconfiguration complete message.
  • the handover command is equivalent to the RRC message containing the handover command, and refers to the RRC message or the configuration in the RRC message that triggers the UE to perform handover.
  • the switching configuration refers to all or part of the configuration in the switching command. Cancel, Release, Delete, Empty and Clear etc. can be substituted. Execution, use, and application are interchangeable. Configuration and reconfiguration can be replaced. Monitor and detect are interchangeable.
  • the RRC re-establishment message is identical to the RRC connection re-establishment message; similarly, its response message, the RRC re-establishment complete message, is identical to the RRC connection re-establishment complete message.
  • the RRC reconfiguration message used for the handover command carries the RRC configuration from the target base station, including but not limited to the following RRC configuration (for details, please refer to Section 6.2.2 of the 3GPP technical standard protocol 38.331):
  • Measurement configuration used to configure intra-frequency, inter-frequency and inter-RAT measurements performed by the UE.
  • cellGroupConfig information element used to configure a primary cell group or a secondary cell group.
  • Radio Link Control Radio Link Control, RLC
  • RLC Radio Link Control
  • MAC Medium Access Control
  • MAC-cellgroupconfig information element physical layer configuration
  • secondary cell addition/modification/release configuration special cell (Special cell, SpCell) configuration, etc.
  • the sPCell configuration includes cell index number, handover information (reconfigurationWithSync information element), radio link failure-related timer and constant configuration, radio link monitoring (Radio Link Monitoring, RLM) configuration, special cell-specific configuration, etc.
  • the reconfigurationwithsync information element is similar to the mobile control information in the LTE system, including handover related information to achieve mobility, which includes serving cell configuration public information, UE's cell radio network temporary identifier C-RNTI in the target cell, and handover process monitoring timer T304 configuration, random access dedicated configuration for the random access process to the target cell, etc.
  • Radio bearerConfig information element used to configure the service data application protocol layer (Service Data Application Protocol, SDAP) of the data radio bearer (Data Radio Bearer, DRB) and/or signaling radio bearer (Signaling Radio Bearer, SRB) ) and Packet Data Convergence Protocol (PDCP).
  • SDAP Service Data Application Protocol
  • DRB Data Radio Bearer
  • SRB Signaling Radio Bearer
  • PDCP Packet Data Convergence Protocol
  • FIG. 1 is a schematic diagram showing a general handover process.
  • a general handover process includes the following phases: Phase 1: Measurement phase. Based on the configured measurement configuration, the UE measures the radio link corresponding to the serving cell or the neighboring cell, and when the configured measurement reporting conditions are met, the UE sends a measurement report to the base station.
  • Phase 2 Handover preparation phase.
  • the base station determines to trigger handover for the UE based on the received measurement report and other factors such as base station load, and the source base station and the target base station obtain the handover command configured by the target base station through the handover preparation process.
  • Phase 3 Switch execution phase.
  • the source base station sends the handover command to the UE, and the UE that receives the handover command immediately applies the configuration of the handover command to perform handover.
  • the UE detects the handover process through a timer T304. When the handover process is initiated, the UE starts the T304 timer; when the handover process is completed, the UE stops the timer T304; when the T304 times out, the UE considers the handover failure.
  • conditional handover also called conditional reconfiguration.
  • CHO conditional handover
  • a relatively conservative measurement report threshold is set, so that the base station obtains the measurement results in advance, and performs handover preparations in advance according to the measurement results and the selected target base station, so that the base station can perform handover under real handover conditions (relative to the conservative Before the measurement report threshold) is met, the handover command including the handover candidate cell and the handover execution condition is sent to the UE in advance, which carries the handover execution condition of the UE.
  • the UE After receiving the conditional handover command, the UE does not execute the handover immediately, but saves the configuration of the received handover command, and starts to monitor the link quality of the source cell or the link quality of the target cell according to the handover execution conditions carried in the handover command message.
  • the road quality is used to evaluate whether the handover execution conditions are met. Only when it detects that the configured handover execution conditions are satisfied, the UE starts to execute the saved handover command and accesses the target cell.
  • the UE can be configured with multiple conditional handover candidate cells at the same time. If multiple conditional handover candidate cells meet the handover execution conditions at the same time, the UE selects one of the candidate cells as the final conditional handover target cell and performs handover to this cell.
  • conditional switching refers to a switching process that is executed only when one or more configured switching execution conditions are satisfied. Because the switching command is included in the RRC reconfiguration message, conditional switching is also called conditional reconfiguration (conditional reconfiguration).
  • conditional reconfiguration conditional reconfiguration
  • the conditional handover command contains the conditional reconfiguration candidate cell list (condReconfigToAddModList information element), and the UE will reconfigure the conditional reconfiguration candidate cell The corresponding configuration is saved in the UE variable VarConditionalReconfig, which contains multiple items.
  • Each item is identified by a conditional reconfiguration identifier (condReconfigId), including the execution condition (condExecutionCond) and the handover configuration of the target cell (condRRCReconfig).
  • the cell identified by the cell identifier in the synchronous reconfiguration (reconfigurationWithSync information element) of the serving cell common configuration (servingCellConfigCommon information element) in the handover configuration of the target cell corresponds to a conditional reconfiguration candidate cell.
  • the UE performs conditional reconfiguration evaluation on each conditional reconfiguration candidate cell according to the execution condition.
  • the execution condition can contain one or two measurement identifiers (measID).
  • the UE Only when the measurement events (condEventA3 or CondEventA5 contained in the CondTriggerConfig information element) corresponding to all the measurement identifiers included in the execution condition are satisfied, the UE considers the corresponding The candidate cell is the trigger cell, and initiates the conditional reconfiguration execution process.
  • conditional reconfiguration execution the UE applies the saved handover configuration (condRRCReconfig) corresponding to the cell to the selected trigger cell, and performs cell handover operations, such as starting timer T304, downlink synchronization to the target cell, and transfer to the target cell Initiate a random access procedure for uplink synchronization, and send an RRC reconfiguration completion message to the target cell (see Section 5.3.5.3 of 3GPP protocol specification document TS38.331 for details, which will not be described here).
  • the conditional reconfiguration and the conditional handover configuration can be replaced, and the conditional handover configuration refers to the above-mentioned configurations related to the conditional handover, and also refers to the RRC reconfiguration message including these configurations.
  • the handover process (the process of applying and executing RRC reconfiguration) is not performed because of CHO, it is collectively referred to as traditional handover, that is, non-CHO handover.
  • the CHO refers to conditional reconfiguration for MCG.
  • the handover information report upon successful handover is also referred to as the Successful Handover Report (Successful Handover Report, SHR).
  • SHR Successful Handover Report
  • the content of the successful handover information report may contain one or more of the following: source cell identity; target cell identity; measurement results of the source cell or target cell; neighbor cell measurement results; Monitoring conditions, such as the reason for indicating that the successful handover information report is triggered (that is, which trigger condition is met), the operation of T310/T312 (indicating whether T310 and/or T312 exceeds the configured threshold value), RLC retransmission status, etc.; Beam failure monitoring when a handover command is received; the best downlink beam or beam identities when performing random access to the target base station; the running status/value of the T304 timer when the handover is successfully completed; and the random access process information; CHO candidate cell information (measurement results or cell identifiers); dual activation protocol stack (Daul Active Protocol Stack, DAPS) indication of RLF occurring in the source cell during handover, etc.
  • DAPS Dual activation protocol stack
  • the successful handover refers to that the RRC reconfiguration complete message for responding to the handover command RRC reconfiguration message to the target base station is successfully sent or the MAC layer successfully completes the random access process to the target base station.
  • the network side needs to configure trigger conditions for reporting successful handover information to the UE, and only when one or more configured trigger conditions are met, the UE will record the handover information of the successful handover. In the current conclusion reached by 3GPP, the UE can inform the network side that there is available successful handover information (such as indicated by the SuccHORep-Available information element) through the RRC message.
  • the network side may request the UE to report its stored successful handover information report through an RRC message (such as the SuccessfulHOReportReq indication in the UEInformationRequest message).
  • the UE will report the saved radio link failure report (SuccessfulHOReport in the UEInformationResponse message) to the network side in the response RRC message.
  • the UE will generate and save a radio link failure report (RLF report) when a radio link failure (Radio Link Failure, RLF) or a handover failure (Handover Failure, HOF) occurs , and save the radio link failure information in the UE variable VarRLF-Report.
  • RLF Radio Link Failure
  • HOF Handover Failure
  • the UE can inform the network side that there is an available radio link failure report (rlf-InfoAvailable information) through the RRC message element to indicate).
  • the RRC connection reconfiguration complete message (RRCConnectionReconfigurationComplete) during the RRC connection reconfiguration process
  • the RRC connection establishment completion during the RRC connection establishment process In the message (RRCConnectionSetupComplete) or in the RRC connection recovery complete message (RRCConnectionResumeComplete) during the RRC connection recovery process, the network side is notified that the UE has a stored available radio link failure report.
  • the network side may request the UE to report the stored radio link failure report through an RRC message (the rlf-ReportReq information element in the UEInformationRequest message indicates the request).
  • the UE will report the stored radio link failure report (rlf-Report information element in the UEInformationResponse message) to the network side in the response RRC message.
  • the wireless link failure report obtained by the network side is used for network optimization, such as network coverage and mobile robustness optimization.
  • the radio link failure report can include: the measurement results of the source cell and neighbor cell available when the link fails, location information, the identity of the primary cell where the link failure occurs, the type of link failure (RLF or HOF), RLF reason, slave The time elapsed from the connection failure to the report of the radio link failure, the time elapsed from the last handover command to the connection failure (recorded as timeConnFailure information element), the cell ID of the UE re-accessing the network, that is, the RRC re-establishment cell ID, etc.
  • the UE shall record the time between the execution time of the CHO process and the reception time of the corresponding CHO configuration corresponding to the selected CHO candidate cell in the corresponding RLF-report
  • the elapsed time by knowing the time information on the network side, can help to adjust the sending timing of the CHO configuration so as to improve the robustness of the conditional handover.
  • Scenario 1 The UE configured with CHO successfully executes a CHO process to a candidate cell.
  • Scenario 2 The UE configured with CHO receives a traditional handover command and successfully executes the handover process before the execution conditions of the candidate cell are satisfied, that is, before the CHO process is executed.
  • scenario 1 in the current conclusion reached by RAN2, the UE includes a time-related information in the SHR, which records that the UE starts to perform the CHO process to the target candidate cell and the UE receives the latest message corresponding to the target candidate cell. The time elapsed between CHO configurations.
  • the UE is configured with CHO but does not execute the CHO process, so how to record the time elapsed from the UE receiving the CHO configuration to the execution of the handover process becomes a concern of the present disclosure.
  • Scenario 3 UE is configured with CHO, but before the execution conditions of CHO are met, that is, before CHO is triggered, RLF of the source cell occurs;
  • scenario 4 The UE is configured with CHO, but before the execution conditions of CHO are satisfied, that is, before CHO is triggered, the UE receives a traditional handover command, but the handover process triggered by the traditional handover command fails, or the handover process succeeds RLF occurred in the target cell shortly after completion.
  • the UE is configured with CHO, but does not perform the CHO process, so how to record the time elapsed from the CHO configuration received by the UE to the execution of the handover process or the time when RLF occurs is also solved by this disclosure question.
  • the handover information report described in the following embodiments of the present disclosure includes a successful handover report SHR in a handover successful scenario and a radio link failure report RLF-report in a handover failure or radio link failure scenario.
  • This embodiment provides a method for reporting handover information performed on a UE.
  • the UE can determine whether the target cell of the handover is a candidate cell in its saved CHO configuration.
  • the time information related to the CHO is set to a corresponding value to provide more accurate handover information to the network side.
  • FIG. 2 is a flowchart showing a handover information reporting method in Embodiment 1 of the present disclosure.
  • the UE For the successful handover scenario, if the UE is configured with CHO, for the first time information in the SHR, the UE sets its value as follows:
  • step 1 the UE judges whether the target cell of the handover process is a candidate cell in its saved CHO configuration VarConditionalReconfig, and if so, proceeds to step 2, and in step 2, the UE sets the first time information as the UE received information including the time elapsed between the latest CHO configuration corresponding to the candidate cell and the UE starting to perform handover; The time elapsed between configuration and when the UE starts to perform handover.
  • the latest CHO configuration corresponding to the candidate cell is not used to release the CHO configuration of the candidate cell, that is, the candidate cell in the latest CHO configuration corresponding to the candidate cell
  • the corresponding CHO configuration identifier CondReconfigId is not included in the conditional reconfiguration release list condReconfigToRemoveList, or the CHO configuration identifier CondReconfigId corresponding to the candidate cell in the latest CHO configuration corresponding to the candidate cell is included in the conditional reconfiguration add modification list condReconfigToAddModList middle.
  • the latest CHO configuration in step 3 is not the CHO configuration that only includes condReconfigToRemoveList; that is, the latest CHO configuration includes at least the conditional reconfiguration add modification list condReconfigToAddModList.
  • the UE when the above-mentioned first time information setting method is used in the above-mentioned scenario 2, before setting the time information, the UE also includes that the UE determines that the handover is not performed because of CHO execution, that is, the handover is a traditional handover.
  • the UE For the handover failure scenario, if the UE is configured with CHO, for the second time information in the RLF-report, the UE sets its value as follows:
  • step 1 the UE judges whether the target cell of the handover process is a candidate cell in its saved CHO configuration VarConditionalReconfig, and if so, proceeds to step 2, and in step 2, the UE sets the second time information as the UE received The time elapsed between the latest CHO configuration corresponding to the candidate cell and the UE starting to perform handover; if not, enter step 3, and in step 3, the UE sets the second time information as the UE receives the latest CHO The time elapsed between configuration and when the UE starts to perform handover.
  • the latest CHO configuration corresponding to the candidate cell is not used to release the CHO configuration of the candidate cell, that is, the candidate cell in the latest CHO configuration corresponding to the candidate cell
  • the corresponding CHO configuration identifier CondReconfigId is not included in the conditional reconfiguration release list condReconfigToRemoveList, or the CHO configuration identifier CondReconfigId corresponding to the candidate cell in the latest CHO configuration corresponding to the candidate cell is included in the conditional reconfiguration add modification list condReconfigToAddModList middle.
  • the latest CHO configuration in step 3 is not the CHO configuration that only includes condReconfigToRemoveList; that is, the latest CHO configuration includes at least the conditional reconfiguration add modification list condReconfigToAddModList.
  • the UE when the above-mentioned second time information setting method is applicable to the above-mentioned scenario 4, before setting the time information, the UE also includes that the UE determines that the handover is not performed because of CHO execution, that is, the handover is a traditional handover.
  • the UE For the scenario of radio link failure (such as the aforementioned scenario 3), if the UE is configured with CHO, for the second time information in the RLF-report, the UE sets its value as follows:
  • the UE sets the second time information as the time elapsed between when the UE receives the latest CHO configuration and when RLF occurs on the UE.
  • the fact that the UE is configured with CHO may also be expressed as that the UE has saved CHO configuration.
  • the handover target cell is one of the conditional handover candidate cells, which refers to the cell identity of the target cell and a synchronous reconfiguration information element included in the MasterCellGroup information element in the saved conditional reconfiguration variable VarConditionalReconfig
  • the cell identities of the candidate cells in reconfigurationWithSync are the same.
  • the UE starts to perform the handover, that is, the time when the UE receives the traditional handover command corresponding to the handover process.
  • This embodiment provides another method for reporting handover information performed on a UE.
  • the UE can determine whether the target cell of the handover is a candidate cell in its saved CHO configuration.
  • the time information related to the CHO is set to a corresponding value to provide more accurate handover information to the network side.
  • the UE For the successful handover scenario, if the UE is configured with CHO, for the first time information in the SHR, the UE sets its value as follows:
  • the UE judges whether the target cell of the handover process is a candidate cell in its saved CHO configuration VarConditionalReconfig, and if so, the UE sets the first time information as the UE receives the latest CHO configuration corresponding to the candidate cell and the UE starts The time elapsed between performing the handover; if not, the UE sets the first time information as the time elapsed between the UE receiving the latest CHO configuration including the candidate cell with the best signal quality and the UE starting to perform the handover.
  • the UE when the above-mentioned first time information setting method is applicable to the above-mentioned scenario 2, before setting the time information, the UE also includes that the UE determines that the handover is not performed because of CHO execution, that is, the handover is a traditional handover.
  • the UE For the handover failure scenario, if the UE is configured with CHO, for the second time information in the RLF-report, the UE sets its value as follows:
  • the UE judges whether the target cell of the handover process is a candidate cell in its saved CHO configuration VarConditionalReconfig, and if so, the UE sets the second time information as the UE receives the latest CHO configuration corresponding to the candidate cell and the UE starts The time elapsed between performing the handover; if not, the UE sets the second time information as the time elapsed between the UE receiving the latest CHO configuration including the candidate cell with the best signal quality and the UE starting to perform the handover.
  • the UE when the above-mentioned second time information setting method is applicable to the above-mentioned scenario 4, before setting the time information, the UE also includes that the UE determines that the handover is not performed because of CHO execution, that is, the handover is a traditional handover.
  • the UE For the scenario of radio link failure (such as the aforementioned scenario 3), if the UE is configured with CHO, for the second time information in the RLF-report, the UE sets its value as follows:
  • the UE sets the second time information as the time elapsed between when the UE receives the latest CHO configuration including the candidate cell with the best signal quality and when the UE occurs the RLF.
  • the fact that the UE is configured with CHO may also be expressed as that the UE has saved CHO configuration.
  • the handover target cell is one of the conditional handover candidate cells, which refers to the cell identity of the target cell and a synchronous reconfiguration information element included in the MasterCellGroup information element in the saved conditional reconfiguration variable VarConditionalReconfig
  • the cell identities of the candidate cells in reconfigurationWithSync are the same.
  • the UE starts to perform the handover, that is, the time when the UE receives the traditional handover command corresponding to the handover process.
  • the candidate cell with the best signal quality refers to the best measurement result among the configured conditional handover candidate cells.
  • the measurement result may be Reference Signal Receiving Power (Reference Signal Receiving Power, RSRP), Reference Information Receiving Quality (Reference Signal Receiving Quality, RSRQ), Signal to Interference plus Noise Ratio (Signal to Interference plus Noise Radio, SINR) or reception RRM measurement results such as Received Signal Strength Indication (RSSI) used to characterize link quality.
  • RSRP Reference Signal Receiving Power
  • RSRQ Reference Information Receiving Quality
  • SINR Signal to Interference plus Noise Ratio
  • SINR Signal to Interference plus Noise Radio
  • reception RRM measurement results such as Received Signal Strength Indication (RSSI) used to characterize link quality.
  • the measurement result is the latest measurement result obtained when the handover execution is started, or the latest measurement result obtained when the handover succeeds or fails. In scenario 3, the measurement is the most recent measurement obtained at RLF,
  • the latest CHO configuration containing the candidate cell is not used to release the CHO configuration of the candidate cell, that is, the CHO configuration corresponding to the candidate cell in the latest CHO configuration containing the candidate cell
  • the configuration identifier CondReconfigId is not included in the conditional reconfiguration release list condReconfigToRemoveList, or the CHO configuration identifier CondReconfigId corresponding to the candidate cell in the latest CHO configuration corresponding to the candidate cell is included in the conditional reconfiguration addition modification list condReconfigToAddModList.
  • the CHO configuration containing the candidate cell with the best signal quality is not the CHO configuration for releasing the candidate cell with the best signal quality;
  • the CHO configuration identifier CondReconfigId corresponding to the candidate cell with the best signal quality in the CHO configuration is not included in the conditional reconfiguration release list condReconfigToRemoveList or contains the candidate in the latest CHO configuration corresponding to the candidate cell with the best signal quality
  • the CHO configuration identifier CondReconfigId corresponding to the cell is included in the conditional reconfiguration add modification list condReconfigToAddModList.
  • This embodiment provides yet another method for reporting handover information performed on a UE.
  • the UE can determine whether the target cell of the handover is a candidate cell in its saved CHO configuration.
  • the time information related to the CHO is set to a corresponding value to provide more accurate handover information to the network side.
  • the UE For the successful handover scenario, if the UE is configured with CHO, for the first time information in the SHR, the UE sets its value as follows:
  • the UE judges whether the target cell of the handover process is a candidate cell in its saved CHO configuration VarConditionalReconfig, and if so, the UE sets the first time information as the UE receives the latest CHO configuration corresponding to the candidate cell and the UE starts The elapsed time between executions of the handover; if not, the UE does not record the first time information.
  • the UE when the above-mentioned first time information setting method is applicable to the above-mentioned scenario 2, before setting the time information, the UE also includes that the UE determines that the handover is not performed because of CHO execution, that is, the handover is a traditional handover.
  • the UE For the handover failure scenario, if the UE is configured with CHO, for the second time information in the RLF-report, the UE sets its value as follows:
  • the UE judges whether the target cell of the handover process is a candidate cell in its saved CHO configuration VarConditionalReconfig, and if so, the UE sets the second time information as the UE receives the latest CHO configuration corresponding to the candidate cell and the UE starts The elapsed time between handovers; if not, the UE does not record the second time information.
  • the UE when the above-mentioned second time information setting method is applicable to the above-mentioned scenario 4, before setting the time information, the UE also includes that the UE determines that the handover is not performed because of CHO execution, that is, the handover is a traditional handover.
  • the UE does not record the second time information, and the second time information refers to the time between when the UE receives the RRC message including the CHO configuration and when the link failure occurs.
  • the fact that the UE is configured with CHO may also be expressed as that the UE has saved CHO configuration.
  • the handover target cell is one of the conditional handover candidate cells, which refers to the cell identity of the target cell and a synchronous reconfiguration information element included in the MasterCellGroup information element in the saved conditional reconfiguration variable VarConditionalReconfig
  • the cell identities of the candidate cells in reconfigurationWithSync are the same.
  • the UE starts to perform the handover, that is, the time when the UE receives the traditional handover command corresponding to the handover process.
  • the latest CHO configuration containing the candidate cell is not used to release the CHO configuration of the candidate cell, that is, the CHO configuration corresponding to the candidate cell in the latest CHO configuration containing the candidate cell
  • the configuration identifier CondReconfigId is not included in the conditional reconfiguration release list condReconfigToRemoveList, or the CHO configuration identifier CondReconfigId corresponding to the candidate cell in the latest CHO configuration corresponding to the candidate cell is included in the conditional reconfiguration addition modification list condReconfigToAddModList.
  • FIG. 3 is a block diagram showing a user equipment UE according to the present invention.
  • the user equipment UE30 includes a processor 301 and a memory 302 .
  • the processor 301 may include, for example, a microprocessor, a microcontroller, an embedded processor, and the like.
  • the memory 302 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memories.
  • Memory 302 has program instructions stored thereon. When the instruction is executed by the processor 301, it can execute the above-mentioned handover information reporting method described in detail in the present invention.
  • the methods and related devices of the present disclosure have been described above in conjunction with preferred embodiments. Those skilled in the art can understand that the methods shown above are only exemplary. The methods of the present disclosure are not limited to the steps and order shown above.
  • the base station and user equipment shown above may include more modules, for example, may also include modules that may be developed or developed in the future and may be used for the base station, MME, or UE, and the like.
  • the various identifiers shown above are only exemplary rather than restrictive, and the present disclosure is not limited to specific information elements as examples of these identifiers. Numerous changes and modifications may be made by those skilled in the art in light of the teachings of the illustrated embodiments.
  • the program running on the device may be a program that causes a computer to realize the functions of the embodiments of the present disclosure by controlling a central processing unit (CPU).
  • the program or information processed by the program may be temporarily stored in volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory systems.
  • a program for realizing the functions of the embodiments of the present disclosure can be recorded on a computer-readable recording medium.
  • the corresponding functions can be realized by causing a computer system to read programs recorded on the recording medium and execute the programs.
  • the so-called “computer system” here may be a computer system embedded in the device, which may include an operating system or hardware (such as peripheral devices).
  • the "computer-readable recording medium” may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium in which a short-term dynamic storage program is stored, or any other recording medium readable by a computer.
  • circuits for example, single-chip or multi-chip integrated circuits.
  • Circuits designed to perform the functions described in this specification may include general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above.
  • DSPs digital signal processors
  • ASICs application-specific integrated circuits
  • FPGAs field-programmable gate arrays
  • a general-purpose processor can be a microprocessor, or it can be any existing processor, controller, microcontroller, or state machine.
  • the above-mentioned circuits may be digital circuits or analog circuits. Where new integrated circuit technologies have emerged to replace existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.
  • present disclosure is not limited to the above-described embodiments. Although various examples of the embodiments have been described, the present disclosure is not limited thereto.
  • Fixed or non-mobile electronic equipment installed indoors or outdoors can be used as terminal equipment or communication equipment, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

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Abstract

本公开提供了一种切换信息报告方法以及用户设备。所述切换信息报告方法，包括：用户设备UE执行了传统切换过程；在所述UE被配置了条件切换CHO的情况下，所述UE根据所切换的目标小区是否是所述UE保存的CHO配置中的候选小区，来设置切换成功时的成功切换报告SHR中的第一时间信息、或者切换失败时的无线链路失败报告RLF-report中的第二时间信息；在所切换的目标小区是所述UE保存的CHO配置中的候选小区的情况下，将所述第一时间信息、或者所述第二时间信息设置为：所述UE接收到包含所述候选小区所对应的最近的CHO配置和所述UE开始执行切换之间所经历的时间；所述传统切换过程是UE在收到切换命令后立即应用切换命令中的配置而执行的切换过程。

Description

切换信息报告方法以及用户设备 技术领域
本公开涉及无线通信技术领域，更具体地，本公开涉及切换情况下的切换信息报告方法、对应的用户设备。
背景技术
2019年12月，在第三代合作伙伴计划(3rd Generation Partnership Project：3GPP)RAN#86次全会上批准了一个Release 17技术标准的新的研究项目(参见非专利文献：RP-193255：New WID on enhancement of data collection for SON/MDT in NR)。这个项目的研究目的是对NR系统中的网络数据收集过程进行增强，以更好地实现自组织自优化网络以及最小化路测的目的。其中研究的具体技术之一是实现成功切换场景下的切换信息报告以及在条件切换场景下的链路失败信息报告。
本公开针对在NR系统中如何实现切换信息报告和链路失败信息报告的问题提出解决方法。
发明内容
本公开实施例的目的在于如何实现在NR系统中切换信息报告的问题提出解决方法。更具体地，本公开针对在NR系统中如何在UE配置了条件切换(Conditional HandOver，CHO)时的切换信息的记录问题提出了解决方法。本公开实施例提供了在用户设备中执行的切换信息报告的方法、相应的用户设备以及通信系统。
根据本公开的第一方面，提出了一种切换信息报告方法，包括：用户设备UE执行了传统切换过程；在所述UE被配置了条件切换CHO的情况下，所述UE根据所切换的目标小区是否是所述UE保存的CHO配置中的候选小区，来设置切换成功时的成功切换报告SHR中的第一时间信息、或者切换失败时的无线链路失败报告RLF-report中的第二时间信息；在所切换的目标小区是所述UE保存的CHO配置中的候选 小区的情况下，将所述第一时间信息、或者所述第二时间信息设置为：所述UE接收到包含所述候选小区所对应的最近的CHO配置和所述UE开始执行切换之间所经历的时间；所述传统切换过程是UE在收到切换命令后立即应用切换命令中的配置而执行的切换过程。
在上述第一方面的切换信息报告方法中，在所切换的目标小区不是所述UE保存的CHO配置中的候选小区的情况下，在切换成功时，将所述第一时间信息设置为：所述UE接收到最近的CHO配置和所述UE开始执行切换之间所经历的时间；在切换失败时，将所述第二时间信息设置为：所述UE接收到最近的CHO配置和所述UE开始执行切换之间所经历的时间。
在上述第一方面的切换信息报告方法中，在所切换的目标小区不是所述UE保存的CHO配置中的候选小区的情况下，在切换成功时，将所述第一时间信息设置为：所述UE接收包含信号质量最好的候选小区的最近的CHO配置和所述UE开始执行切换之间所经历的时间；在切换失败时，将所述第二时间信息设置为：所述UE接收包含信号质量最好的候选小区的最近的CHO配置和所述UE开始执行切换之间所经历的时间。
在上述第一方面的切换信息报告方法中，在所切换的目标小区不是所述UE保存的CHO配置中的候选小区的情况下，在切换成功时，所述UE不记录所述第一时间信息，在切换失败时，所述UE不记录所述第二时间信息
在上述第一方面的切换信息报告方法中，所述信号质量最好的候选小区是在所配置的条件切换候选小区中测量结果最好的候选小区，所述测量结果可以是参考信号接收功率RSRP、参考信息接收质量RSRQ、信号与干扰加噪声比SINR、或接收信号强度指示RSSI的用于表征链路质量的测量结果。
在上述第一方面的切换信息报告方法中，所切换的目标小区是所述UE保存的CHO配置中的候选小区可以表示：所述目标小区的小区标识与包含在所保存的条件重配置变量VarConditionalReconfig中的 MasterCellGroup信息元素中的同步重配置信息元素reconfigurationWithSync中的候选小区的小区标识相同。
根据本公开的第二方面，提出了一种切换信息报告方法，包括：用户设备UE发生了无线链路失败RLF；在所述UE被配置了条件切换CHO的情况下，所述UE将无线链路失败报告RLF-report中的第二时间信息设置为以下信息的任意一个：所述UE接收到最近的CHO配置和所述UE发生RLF之间所经历的时间；所述UE接收包含信号质量最好的候选小区的最近的CHO配置和所述UE发生RLF之间所经历的时间；所述UE不记录第二时间信息。
根据本公开的第三方面，提出了一种用户设备UE，包括：处理器；以及存储器，存储有指令；其中，所述指令在由所述处理器运行时执行根据上下文所述的切换信息报告方法。
附图说明
为了更完整地理解本公开及其优势，现在将参考结合附图的以下描述，其中：
图1是表示一般切换过程示意图。
图2是表示本公开的实施例1中的切换信息报告方法的流程图。
图3是表示本公开所涉及的用户设备UE的框图。
在附图中，相同或相似的结构均以相同或相似的附图标记进行标识。
具体实施方式
根据结合附图对本公开示例性实施例的以下详细描述，本公开的其它方面、优势和突出特征对于本领域技术人员将变得显而易见。
在本公开中，术语“包括”和“含有”及其派生词意为包括而非限制；术语“或”是包含性的，意为和/或。
在本说明书中，下述用于描述本公开原理的各种实施例只是说明，不应该以任何方式解释为限制公开的范围。参照附图的下述描述用于 帮助全面理解由权利要求及其等同物限定的本公开的示例性实施例。下述描述包括多种具体细节来帮助理解，但这些细节应认为仅仅是示例性的。因此，本领域普通技术人员应认识到，在不背离本公开的范围和精神的情况下，可以对本文中描述的实施例进行多种改变和修改。此外，为了清楚和简洁起见，省略了公知功能和结构的描述。此外，贯穿附图，相同参考数字用于相似功能和操作。
下文以长期演进系统(Long Term Evolution，LTE)/NR移动通信系统及其后续的演进版本作为示例应用环境，具体描述了根据本公开的多个实施方式。然而，需要指出的是，本公开不限于以下实施方式，而是可适用于更多其它的无线通信系统。若无特殊说明，在本公开中，小区和基站的概念可以互相替换；LTE系统也用于指代5G及其之后的LTE系统(如称为eLTE系统，或者可以连接到5G核心网的LTE系统)，同时LTE可以用演进的通用陆地无线接入(Evolved Universal Terrestrial Radio Access，E-UTRA)或演进的通用陆地无线接入网E-UTRAN来替换。在本公开中，切换指的是网络侧发起的主小区的变更，包含小区间的主小区变更也包含小区内的主小区变更，即UE的主小区从源小区变更为目标小区，其中源小区和目标小区可以是同一个小区也可以是不同的小区，在此过程中，用于接入层安全的秘钥或安全算法也可随之更新或不更新。所述安全包括加密解密和完整性保护。源小区也可称为源基站，或称源光束(beam)、源传输点(Transmission point，TRP)，源主小区(Primary Cell，PCell)，源主小区组(Master Cell Group，MCG)；目标小区也可称为目标基站，或目标光束、目标传输点，目标主小区PCell，目标小区组MCG。源小区指的是切换过程发起之前所连接的为UE服务的小区即向UE发送包含切换命令的无线资源控制(Radio Resource Control，RRC)消息的小区。目标小区指的是切换过程成功完成之后UE所连接的为UE服务的小区，切换命令中所包含的目标小区标识所指示的小区，或描述为切换过程中执行下行同步和随机接入的小区。本公开所述切换也可以指主辅小区(Primary Secondary Cell，PSCell)的变更，此时，切换 信息或切换报告指的是所述PSCell相关的切换信息或切换报告。本公开所述切换命令用于触发UE执行切换，在NR系统中是包含同步重配置(Reconfigurationwithsync)信息元素的RRC重配置消息，更进一步地，是包含用于主小区组MCG的同步重配置(Reconfigurationwithsync)信息元素的RRC重配置消息。此时，切换也可称为MCG的同步重配置。在LTE系统中是包含移动控制信息(MobilityControlInfo)信息元素的RRC连接重配置消息。其中，所述同步重配置信息元素或移动控制信息信息元素可以包含目标小区的配置信息，例如目标小区标识、目标小区频率、目标小区的公共配置如系统信息、UE接入到目标小区所使用的随机接入配置、UE在目标小区的安全参数配置、UE在目标小区的无线承载配置等。为便于描述，本公开中RRC重配置消息和RRC连接重配置消息等同；同理，其响应消息RRC重配置完成消息和RRC连接重配置完成消息等同。切换命令和包含切换命令的RRC消息等同，指触发UE执行切换的RRC消息或RRC消息中的配置。切换配置指切换命令中的全部或部分配置。取消、释放、删除、清空和清除等可以替换。执行、使用和应用可替换。配置和重配置可以替换。监测(monitor)和检测(detect)可替换。RRC重建立消息和RRC连接重建立消息等同；同理，其响应消息RRC重建立完成消息和RRC连接重建立完成消息等同。
下列描述了本公开涉及的现有技术中的过程或概念。
NR系统中的切换配置：
在NR系统中，用于切换命令的RRC重配置消息承载着来自目标基站的RRC配置，包含但不限于下述RRC配置(具体请参见3GPP技术标准协议38.331中的6.2.2章节)：
-测量配置(measconfig信息元素)：用于配置UE所执行的频率内、频率间和无线接入技术间的测量。如测量对象配置、测量上报配置、测量空隙(gap)配置等。
-小区组配置(cellGroupConfig信息元素)，用于配置主小区组或辅小区组。包括数据无线承载/信令无线承载对应的无线链路控制 (Radio Link Control，RLC)承载配置(rlc-bearerToAddModList信息元素和rlc-bearerToreleaselist信息元素)、媒介接入控制(Medium Access Control，MAC)配置(MAC-cellgroupconfig信息元素)、物理层配置、辅小区添加/修改/释放配置、特殊小区(Special cell，SpCell)配置等。其中，sPCell配置中包含小区索引号、切换信息(reconfigurationWithSync信息元素)、无线链路失败相关定时器及常数配置、无线链路检测(Radio Link Monitoring，RLM)配置、特殊小区专用配置等。其中reconfigurationwithsync信息元素和LTE系统中的移动控制信息类似，包含切换相关信息来实现移动性，其包含服务小区配置公共信息、UE在目标小区的小区无线网络临时标识C-RNTI、切换过程监控定时器T304配置、用于向目标小区随机接入过程的随机接入专用配置等。
-非接入层专用信息(dedicatedInfoNASList信息元素)。
-无线承载配置(radiobearerConfig信息元素)，用于配置数据无线承载(Data Radio Bearer，DRB)和/或信令无线承载(Signaling Radio Bearer，SRB)的服务数据应用协议层(Service Data Application Protocol，SDAP)和包数据汇聚协议层(Packet Data Convergence Protocol，PDCP)。
-主密钥更新配置(masterKeyupdate信息元素)。
NR系统中的切换过程：
连接态的用户移动性主要通过切换过程来实现，所述切换即指的是处于RRC连接态的UE变更服务小区(主小区)的过程。图1是表示一般切换过程示意图。如图1所示，一般的切换过程包含下述阶段：阶段1：测量阶段。UE基于被配置的测量配置对服务小区或邻小区所对应的无线链路进行测量，当满足所配置的测量上报条件时，UE向基站发送测量报告。阶段2：切换准备阶段。基站结合收到的测量报告以及其他因素如基站负载等确定对该UE触发切换，源基站和目标基站通过切换准备过程获取目标基站配置的切换命令。阶段3：切换执行阶段。源基站将切换命令下发给UE，收到切换命令的UE立即应 用该切换命令的配置执行切换。UE通过一个定时器T304来检测切换过程，当切换过程发起时，UE开启T304定时器；当切换过程完成时，UE停止定时器T304；当T304超时，UE认为切换失败。
不同于一般切换过程中阶段3中UE收到切换命令后立即执行切换，NR系统还支持条件切换CHO，也称条件重配置。在条件切换中，设置相对保守的测量报告门限，使得基站提前获取测量结果，并根据测量结果和选定的目标基站提前执行切换准备，这样基站可以在真正的切换条件(相对于所述保守的测量报告门限)满足之前，提前将包含切换候选小区和切换执行条件的切换命令下发给UE，其中携带UE执行切换的条件。UE收到条件切换命令后，并不会立即执行切换，而是保存所接收到的切换命令配置，并根据切换命令消息中携带的切换执行条件开始监测源小区的链路质量或目标小区的链路质量以评估切换执行条件是否满足。只有当监测到所配置的切换执行条件满足时，UE才开始执行所保存的切换命令，接入到目标小区。UE可以同时被配置多个条件切换候选小区，若多个条件切换候选小区同时满足切换执行条件，那么UE在其中选择一个候选小区作为最终的条件切换的目标小区，执行到该小区的切换。总言之，条件切换是指只有当所配置的一个或多个切换执行条件满足时才执行的切换过程。因为切换命令是包含在RRC重配置消息中的，所以条件切换也称为条件重配置(conditional reconfiguration)。在NR系统中，UE收到包含条件切换命令(ConditionalReconfiguration信息元素)的RRC重配置消息后，条件切换命令中包含条件重配置候选小区列表(condReconfigToAddModList信息元素)，UE将所述条件重配置候选小区对应的配置保存在UE变量VarConditionalReconfig中，其中包含多个项。每个项以一个条件重配置标识(condReconfigId)来标识，包含执行条件(condExecutionCond)和目标小区的切换配置(condRRCReconfig)。目标小区的切换配置中的同步重配置(reconfigurationWithSync信息元素)中的服务小区公共配置(servingCellConfigCommon信息元素)中的小区标识所标识的小区对 应了一个条件重配置候选小区。UE根据执行条件对每一个条件重配置候选小区执行条件重配置评估。执行条件中可以包含一个或两个测量标识(measID)，只有当执行条件中包含的所有测量标识所对应的测量事件(包含在CondTriggerConfig信息元素中的condEventA3或CondEventA5)都满足时，UE认为所对应的候选小区为触发小区，并发起条件重配置执行过程。在条件重配置执行过程中，UE对所选择的触发小区应用所保存的该小区对应的切换配置(condRRCReconfig)，并执行小区切换操作，如启动定时器T304，下行同步到目标小区，向目标小区发起随机接入过程以上行同步，向目标小区发送RRC重配置完成消息等(详见3GPP协议规范文档TS38.331的5.3.5.3章节，此处不赘述)。条件重配置和条件切换配置可以替换，条件切换配置指上述各项条件切换相关的配置，也可指包含这些配置的RRC重配置消息。
本公开中，若切换过程(应用并执行RRC重配置的过程)不是因为CHO而执行的，统称为传统切换，即非CHO切换。所述CHO指用于MCG的条件重配置。
成功切换报告：
如前所述，版本17的新的研究项目中目的之一是引入成功切换时的切换信息报告。成功切换时的切换信息报告也简称成功切换报告(Successful Handover Report，SHR)。这是因为，在NR系统中单靠已有机制中的无线链路失败RLF报告来执行网络优化可能会使得数据收集过程变得漫长，而在切换成功时切换信息报告使得网络侧能更快获得移动性过程中的足够样本数。其次，即使是对于成功的切换场景，其移动性参数还是有进一步优化的空间的。对于成功切换信息报告内容，可以包含下述一种或多种：源小区标识；目标小区标识；源小区或目标小区的测量结果；邻居小区测量结果；接收到切换命令时或切换执行时的RLF监测情况，如指示成功切换信息报告被触发的原因(即哪一个触发条件被满足)T310/T312的运行情况(指示T310和/或T312是否超过配置的门限值)、RLC重传状态等；接收到切换命令时的波束失败监测情况；执行到目标基站的随机接入时下行最好的 一个或多个波束标识；切换成功完成时的T304定时器的运行状态/值；以及随机接入过程信息；CHO候选小区信息(测量结果或小区标识)；双激活协议栈(Daul Active Protocol Stack，DAPS)切换过程中源小区发生RLF的指示等。所述切换成功指的是用于向目标基站响应切换命令RRC重配置消息的RRC重配置完成消息成功发送或者MAC层成功完成到目标基站的随机接入过程。网络侧需要向UE配置成功切换信息报告的触发条件，只有当配置的一个或多个触发条件满足时，UE才会记录所述成功切换的切换信息。在目前3GPP已达成的结论中，UE可以通过RRC消息告知网络侧其上有可用的成功切换信息(如SuccHORep-Available信息元素来指示)。网络侧在收到所述指示后，可以通过RRC消息(如UEInformationRequest消息中的SuccessfulHOReportReq指示)来请求UE上报其保存的成功切换信息报告。UE会在响应RRC消息中将所保存的无线链路失败报告(UEInformationResponse消息中的SuccessfulHOReport)上报给网络侧。
链路失败信息上报机制：
当前的LTE系统和版本16的NR系统中，UE会在发生无线链路失败(Radio Link Failure，RLF)或切换失败(Handover Failure，HOF)时生成并保存一个无线链路失败报告(RLF report)，并将无线链路失败信息保存在UE变量VarRLF-Report。在恢复与网络侧的连接(如通过RRC重建立过程或用于建立新连接的RRC建立过程)后，UE可以通过RRC消息告知网络侧其上有可用的无线链路失败报告(rlf-InfoAvailable信息元素来指示)。如UE可以在RRC连接重建立过程中的RRC连接重建立完成消息(RRCConnectionReestablishmentComplete)中、RRC连接重配置过程中的RRC连接重配置完成消息(RRCConnectionReconfigurationComplete)中、RRC连接建立过程中的RRC连接建立完成消息(RRCConnectionSetupComplete)中或RRC连接恢复过程中的RRC连接恢复完成消息 (RRCConnectionResumeComplete)中告知网络侧UE有保存的可用的无线链路失败报告。网络侧在收到所述指示后，可以通过RRC消息(UEInformationRequest消息中的rlf-ReportReq信息元素来指示所述请求)来请求UE上报其保存的无线链路失败报告。UE会在响应RRC消息中将所保存的无线链路失败报告(UEInformationResponse消息中的rlf-Report信息元素)上报给网络侧。网络侧获取的所述无线链路失败报告用于网络优化，如网络覆盖和移动鲁棒性优化。无线链路失败报告中可包含：链路失败时可用的源小区和邻居小区的测量结果、位置信息、发生链路失败的主小区标识、链路失败类型(RLF还是HOF)、RLF理由、从连接失败到上报无线链路失败所经历的时间、上次收到切换命令到连接失败所经历的时间(记做timeConnFailure信息元素)，UE重新接入网络的小区标识即RRC重建立小区标识等。在当前版本17的讨论中，对于对于执行了CHO发生HOF的场景，UE要在对应的RLF-report中记录CHO过程执行的时间和对应的所选择的CHO候选小区对应的CHO配置接收时间之间所经历的时间，网络侧通过获知该时间信息，可以有助与调整CHO配置的下发时机从而提高条件切换的鲁棒性。
对于被配置了CHO场景下的SHR，包含两种场景：场景1：被配置了CHO的UE成功执行了一个到候选小区的CHO过程。场景2：被配置了CHO的UE，在候选小区的执行条件满足之前即执行CHO过程之前，收到了一个传统切换命令且UE成功执行了该切换过程。对于场景1，RAN2当前达成的结论中，UE在SHR中包含一个时间相关信息，该时间相关信息记录了UE开始执行到目标候选小区的CHO过程和UE接收到包含该目标候选小区相对应的最近的CHO配置之间所经历的时间。在场景2时，UE被配置了CHO，但并没有执行CHO过程，那么如何记录从UE接收的CHO配置到切换过程执行之间经历的时间成为本公开关注的问题。
同样，对于被配置了CHO场景下的RLF-report，也存在一些场景： 场景3：UE被配置了CHO，但在CHO的执行条件满足前即CHO被触发前，发生了源小区的RLF；场景4：UE被配置了CHO，但在CHO的执行条件满足前即CHO被触发前，UE收到了一个传统切换命令，但是该传统切换命令所触发的切换过程发生了失败，或者在该切换过程成功完成后不久在目标小区发生了RLF。那么在这些场景下，UE被配置了CHO，但并没有执行CHO过程，那么如何记录从UE接收的CHO配置到切换过程执行或到发生RLF的时间之间所经历的时间也是本公开所解决的问题。
下述各实施例基于上述问题给出解决方法，如无特殊说明，一些概念或定义在各实施例之间是可以通用的。如无特殊说明，本公开下述实施例所述切换信息报告包含切换成功场景下的成功切换报告SHR和切换失败或无线链路失败场景下的无线链路失败报告RLF-report。
实施例1：
该实施例给出了一种在UE上执行的切换信息报告方法。通过该实施例所述方法，在UE配置了CHO，但是又未执行CHO过程时的切换信息报告中，UE可以根据所述切换的目标小区是否是其保存的CHO配置中的候选小区，从而确定将CHO相关的时间信息设置为对应的值，以向网络侧提供更精确的切换信息。
作为一例，图2是表示本公开的实施例1中的切换信息报告方法的流程图。
对于成功切换的场景，若UE被配置了CHO，对SHR中的第一时间信息，UE按照如下方式来设置其值：
在步骤1中，UE判断切换过程的目标小区是否是其保存的CHO配置VarConditionalReconfig中的一个候选小区，若是，则进入步骤2，在步骤2中，UE将第一时间信息设置为UE接收到包含所述候选小区所对应的最近的CHO配置和UE开始执行切换之间所经历的时间；若否，则进入步骤3，在步骤3中，UE将第一时间信息设置为UE接收 到最近的CHO配置和UE开始执行切换之间所经历的时间。
可选地，步骤2中所述包含所述候选小区所对应的最近的CHO配置不用于释放该候选小区的CHO配置，即在包含所述候选小区所对应的最近的CHO配置中所述候选小区对应的CHO配置标识CondReconfigId不包含在条件重配置释放列表condReconfigToRemoveList中，或者包含所述候选小区所对应的最近的CHO配置中所述候选小区对应的CHO配置标识CondReconfigId包含在条件重配置添加修改列表condReconfigToAddModList中。
可选地，步骤3中所述最近的CHO配置不是仅包含condReconfigToRemoveList的CHO配置；即所述最近的CHO配置至少包含了条件重配置添加修改列表condReconfigToAddModList。
优选地，上述第一时间信息设置方式使用于前述场景2时，UE在设置该时间信息之前还包括UE确定所述切换不是因为CHO执行而执行的，即所述切换是一个传统切换。
对于切换失败的场景，若UE被配置了CHO，对RLF-report中的第二时间信息，UE按照如下方式来设置其值：
在步骤1中，UE判断切换过程的目标小区是否是其保存的CHO配置VarConditionalReconfig中的一个候选小区，若是，则进入步骤2，在步骤2中，UE将第二时间信息设置为UE接收到包含所述候选小区所对应的最近的CHO配置和UE开始执行切换之间所经历的时间；若否，则进入步骤3，在步骤3中，UE将第二时间信息设置为UE接收到最近的CHO配置和UE开始执行切换之间所经历的时间。
可选地，步骤2中所述包含所述候选小区所对应的最近的CHO配置不用于释放该候选小区的CHO配置，即在包含所述候选小区所对应的最近的CHO配置中所述候选小区对应的CHO配置标识CondReconfigId不包含在条件重配置释放列表condReconfigToRemoveList中，或者包含所述候选小区所对应的最近的CHO配置中所述候选小区对应的CHO配置标识CondReconfigId包含在条件重配置添加修改列表condReconfigToAddModList中。
可选地，步骤3中所述最近的CHO配置不是仅包含condReconfigToRemoveList的CHO配置；即所述最近的CHO配置至少包含了条件重配置添加修改列表condReconfigToAddModList。
优选地，上述第二时间信息设置方式适用于前述场景4时，UE在设置该时间信息之前还包括UE确定所述切换不是因为CHO执行而执行的，即所述切换是一个传统切换。
对于无线链路失败的场景(如前述场景3)，若UE被配置了CHO，对RLF-report中的第二时间信息，UE按照如下方式来设置其值：
UE将第二时间信息设置为UE接收到最近的CHO配置和UE发生RLF之间所经历的时间。
所述UE被配置了CHO也可表述为UE有保存的CHO配置。所述切换的目标小区是条件切换候选小区中的其中一个，指的是所述目标小区的小区标识与一个包含在所保存的条件重配置变量VarConditionalReconfig中的MasterCellGroup信息元素中的同步重配置信息元素reconfigurationWithSync中的候选小区的小区标识相同。UE开始执行切换也就是UE接收到该切换过程对应的传统切换命令的时间。
实施例2：
该实施例给出了另一种在UE上执行的切换信息报告方法。通过该实施例所述方法，在UE配置了CHO，但是又未执行CHO过程时的切换信息报告中，UE可以根据所述切换的目标小区是否是其保存的CHO配置中的候选小区，从而确定将CHO相关的时间信息设置为对应的值，以向网络侧提供更精确的切换信息。
对于成功切换的场景，若UE被配置了CHO，对SHR中的第一时间信息，UE按照如下方式来设置其值：
UE判断切换过程的目标小区是否是其保存的CHO配置VarConditionalReconfig中的一个候选小区，若是，则UE将第一时间信息设置为UE接收到包含所述候选小区所对应的最近的CHO配置和 UE开始执行切换之间所经历的时间；若否，则UE将第一时间信息设置为UE接收包含信号质量最好的候选小区的最近的CHO配置和UE开始执行切换之间所经历的时间。
优选地，上述第一时间信息设置方式适用于前述场景2时，UE在设置该时间信息之前还包括UE确定所述切换不是因为CHO执行而执行的，即所述切换是一个传统切换。
对于切换失败的场景，若UE被配置了CHO，对RLF-report中的第二时间信息，UE按照如下方式来设置其值：
UE判断切换过程的目标小区是否是其保存的CHO配置VarConditionalReconfig中的一个候选小区，若是，则UE将第二时间信息设置为UE接收到包含所述候选小区所对应的最近的CHO配置和UE开始执行切换之间所经历的时间；若否，则UE将第二时间信息设置为UE接收包含信号质量最好的候选小区的最近的CHO配置和UE开始执行切换之间所经历的时间。
优选地，上述第二时间信息设置方式适用于前述场景4时，UE在设置该时间信息之前还包括UE确定所述切换不是因为CHO执行而执行的，即所述切换是一个传统切换。
对于无线链路失败的场景(如前述场景3)，若UE被配置了CHO，对RLF-report中的第二时间信息，UE按照如下方式来设置其值：
UE将第二时间信息设置为UE接收包含信号质量最好的候选小区的最近的CHO配置和UE发生RLF之间所经历的时间。
所述UE被配置了CHO也可表述为UE有保存的CHO配置。所述切换的目标小区是条件切换候选小区中的其中一个，指的是所述目标小区的小区标识与一个包含在所保存的条件重配置变量VarConditionalReconfig中的MasterCellGroup信息元素中的同步重配置信息元素reconfigurationWithSync中的候选小区的小区标识相同。UE开始执行切换也就是UE接收到该切换过程对应的传统切换命令的时间。
优选地，所述信号质量最好的候选小区指的是在所配置的条件切 换候选小区中其测量结果最好。所述测量结果可以是参考信号接收功率(Reference Signal Receiving Power，RSRP)、参考信息接收质量(Reference Signal Receiving Quality，RSRQ)、信号与干扰加噪声比(Signal to Interference plus Noise Radio，SINR)或接收信号强度指示(Received Signal Strength Indication，RSSI)等用于表征链路质量的RRM测量结果。可选地，所述测量结果是在开始切换执行时获得的最近的测量结果，或者是在切换成功时或发生切换失败时获得的最近的测量结果。在场景3中，所述测量结果是在RLF时获得的最近的测量结果，
可选地，所述包含所述候选小区所对应的最近的CHO配置不用于释放该候选小区的CHO配置，即在包含所述候选小区所对应的最近的CHO配置中所述候选小区对应的CHO配置标识CondReconfigId不包含在条件重配置释放列表condReconfigToRemoveList中，或者包含所述候选小区所对应的最近的CHO配置中所述候选小区对应的CHO配置标识CondReconfigId包含在条件重配置添加修改列表condReconfigToAddModList中。
可选地，所述包含信号质量最好的候选小区的CHO配置不是用于释放该信号质量最好的候选小区的CHO配置；即在包含所述信号质量最好的候选小区所对应的最近的CHO配置中所述信号质量最好的候选小区对应的CHO配置标识CondReconfigId不包含在条件重配置释放列表condReconfigToRemoveList中或者包含所述信号质量最好的候选小区所对应的最近的CHO配置中所述候选小区对应的CHO配置标识CondReconfigId包含在条件重配置添加修改列表condReconfigToAddModList中。
实施例3：
该实施例给出了又一种在UE上执行的切换信息报告方法。通过该实施例所述方法，在UE配置了CHO，但是又未执行CHO过程时的切换信息报告中，UE可以根据所述切换的目标小区是否是其保存 的CHO配置中的候选小区，从而确定将CHO相关的时间信息设置为对应的值，以向网络侧提供更精确的切换信息。
对于成功切换的场景，若UE被配置了CHO，对SHR中的第一时间信息，UE按照如下方式来设置其值：
UE判断切换过程的目标小区是否是其保存的CHO配置VarConditionalReconfig中的一个候选小区，若是，则UE将第一时间信息设置为UE接收到包含所述候选小区所对应的最近的CHO配置和UE开始执行切换之间所经历的时间；若否，则UE不记录第一时间信息。
优选地，上述第一时间信息设置方式适用于前述场景2时，UE在设置该时间信息之前还包括UE确定所述切换不是因为CHO执行而执行的，即所述切换是一个传统切换。
对于切换失败的场景，若UE被配置了CHO，对RLF-report中的第二时间信息，UE按照如下方式来设置其值：
UE判断切换过程的目标小区是否是其保存的CHO配置VarConditionalReconfig中的一个候选小区，若是，则UE将第二时间信息设置为UE接收到包含所述候选小区所对应的最近的CHO配置和UE开始执行切换之间所经历的时间；若否，则UE不记录第二时间信息。
优选地，上述第二时间信息设置方式适用于前述场景4时，UE在设置该时间信息之前还包括UE确定所述切换不是因为CHO执行而执行的，即所述切换是一个传统切换。
对于无线链路失败的场景(如前述场景3)，则UE不记录第二时间信息，所述第二时间信息指的是UE接收包含CHO配置的RRC消息到发生链路失败之间的时间。
所述UE被配置了CHO也可表述为UE有保存的CHO配置。所述切换的目标小区是条件切换候选小区中的其中一个，指的是所述目标小区的小区标识与一个包含在所保存的条件重配置变量VarConditionalReconfig中的MasterCellGroup信息元素中的同步重配 置信息元素reconfigurationWithSync中的候选小区的小区标识相同。UE开始执行切换也就是UE接收到该切换过程对应的传统切换命令的时间。
可选地，所述包含所述候选小区所对应的最近的CHO配置不用于释放该候选小区的CHO配置，即在包含所述候选小区所对应的最近的CHO配置中所述候选小区对应的CHO配置标识CondReconfigId不包含在条件重配置释放列表condReconfigToRemoveList中，或者包含所述候选小区所对应的最近的CHO配置中所述候选小区对应的CHO配置标识CondReconfigId包含在条件重配置添加修改列表condReconfigToAddModList中。
实施例4：
该实施例对本公开的用户设备UE进行说明。图3是表示本发明所涉及的用户设备UE的框图。如图3所示，该用户设备UE30包括处理器301和存储器302。处理器301例如可以包括微处理器、微控制器、嵌入式处理器等。存储器302例如可以包括易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器等。存储器302上存储有程序指令。该指令在由处理器301运行时，可以执行本发明中详细描述的上述的切换信息报告方法。
上文已经结合优选实施例对本公开的方法和涉及的设备进行了描述。本领域技术人员可以理解，上面示出的方法仅是示例性的。本公开的方法并不局限于上面示出的步骤和顺序。上面示出的基站和用户设备可以包括更多的模块，例如还可以包括可以开发的或者将来开发的可用于基站、MME、或UE的模块等等。上文中示出的各种标识仅是示例性的而不是限制性的，本公开并不局限于作为这些标识的示例的具体信元。本领域技术人员根据所示实施例的教导可以进行许多变 化和修改。
运行在根据本公开的设备上的程序可以是通过控制中央处理单元(CPU)来使计算机实现本公开的实施例功能的程序。该程序或由该程序处理的信息可以临时存储在易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统中。
用于实现本公开各实施例功能的程序可以记录在计算机可读记录介质上。可以通过使计算机系统读取记录在所述记录介质上的程序并执行这些程序来实现相应的功能。此处的所谓“计算机系统”可以是嵌入在该设备中的计算机系统，可以包括操作系统或硬件(如外围设备)。“计算机可读记录介质”可以是半导体记录介质、光学记录介质、磁性记录介质、短时动态存储程序的记录介质、或计算机可读的任何其他记录介质。
用在上述实施例中的设备的各种特征或功能模块可以通过电路(例如，单片或多片集成电路)来实现或执行。设计用于执行本说明书所描述的功能的电路可以包括通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、或其他可编程逻辑器件、分立的门或晶体管逻辑、分立的硬件组件、或上述器件的任意组合。通用处理器可以是微处理器，也可以是任何现有的处理器、控制器、微控制器、或状态机。上述电路可以是数字电路，也可以是模拟电路。因半导体技术的进步而出现了替代现有集成电路的新的集成电路技术的情况下，本公开的一个或多个实施例也可以使用这些新的集成电路技术来实现。
此外，本公开并不局限于上述实施例。尽管已经描述了所述实施例的各种示例，但本公开并不局限于此。安装在室内或室外的固定或非移动电子设备可以用作终端设备或通信设备，如AV设备、厨房设备、清洁设备、空调、办公设备、自动贩售机、以及其他家用电器等。
如上，已经参考附图对本公开的实施例进行了详细描述。但是，具体的结构并不局限于上述实施例，本公开也包括不偏离本公开主旨的任 何设计改动。另外，可以在权利要求的范围内对本公开进行多种改动，通过适当地组合不同实施例所公开的技术手段所得到的实施例也包含在本公开的技术范围内。此外，上述实施例中所描述的具有相同效果的组件可以相互替代。

Claims (2)

  1. 一种切换信息报告方法，包括：
    在用户设备UE发生了无线链路失败RLF和所述UE有保存的条件切换CHO的情况下，所述UE将无线链路失败报告RLF-report中的一个时间信息设置为：
    所述UE接收到最近的CHO配置和所述UE发生RLF之间所经历的时间。
  2. 一种用户设备UE，包括处理器，被配置为：
    在用户设备UE发生了无线链路失败RLF和所述UE有保存的条件切换CHO的情况下，所述UE将无线链路失败报告RLF-report中的一个时间信息设置为：
    所述UE接收到最近的CHO配置和所述UE发生RLF之间所经历的时间。
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