WO2021057702A1 - Procédé de reprise après défaillance de liaison radio et équipement utilisateur - Google Patents

Procédé de reprise après défaillance de liaison radio et équipement utilisateur Download PDF

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Publication number
WO2021057702A1
WO2021057702A1 PCT/CN2020/116745 CN2020116745W WO2021057702A1 WO 2021057702 A1 WO2021057702 A1 WO 2021057702A1 CN 2020116745 W CN2020116745 W CN 2020116745W WO 2021057702 A1 WO2021057702 A1 WO 2021057702A1
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cell
handover
link failure
conditional handover
radio link
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PCT/CN2020/116745
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English (en)
Chinese (zh)
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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
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure

Definitions

  • the present disclosure relates to the field of wireless communication technology, and more specifically, the present disclosure relates to a recovery method and user equipment after a wireless link failure.
  • Non-Patent Document: RP-181433 New WID on NR (New Radio) mobility enhancements.
  • One of the research goals of these two projects is to find one of the mobility needs in the network: seamless handover, that is, the handover interruption time of 0 milliseconds or close to 0 milliseconds can be met during the cell handover, and the handover can be enhanced. Robustness.
  • CHO Conditional Handover
  • the base station issues a handover command to the UE in advance, and the handover command contains conditional configuration information.
  • the UE saves the received conditional handover command, and performs handover according to the previously received handover command when the configured condition is met. In this way, the early issuance of the handover command can increase the success rate of handover command reception, thereby improving the handover success rate, and avoiding the delay caused by the handover failure caused by the failure of the handover command reception to service interruption.
  • the present disclosure proposes solutions to some problems in implementing CHO in the NR system and the LTE (Long Term Evolution) system.
  • the purpose of the embodiments of the present disclosure is to propose a solution to the problem of implementing the CHO technology in the NR system and the LTE system. More specifically, the present disclosure addresses the issue of how to use the saved CHO configuration to restore the link connection when the wireless link fails. For example, how to set the wireless link failure report in the scheme of using the saved CHO configuration to restore the link connection.
  • the embodiments of the present disclosure provide a recovery method when a wireless link fails in a user equipment and corresponding user equipment.
  • a method for recovering from a radio link failure including: user equipment UE initiates an RRC connection re-establishment process; in the cell selection process of the RRC connection re-establishment process, in the selected cell In the case of a conditional handover candidate cell of the UE, the UE identifies the selected conditional handover candidate cell in the radio link failure report.
  • the UE may set the link recovery cell identifier in the radio link failure report variable VarRLF-Report as the selected conditional handover candidate cell identifier.
  • the following operation may also be performed: the UE performs a conditional handover to the selected cell, Initiate a conditional handover process, apply the saved conditional handover configuration of the cell, and perform access to the selected cell.
  • the RRC connection re-establishment process is continued.
  • a radio link failure recovery method including: determining whether a radio link failure RLF occurs in the radio link of a user equipment UE; when the RLF occurs in the UE, if the RLF The UE is configured with conditional handover, the UE performs the cell selection process in the conditional handover link recovery process; in the case that the selected cell is a candidate cell for conditional handover of the UE, the UE fails in the radio link The selected conditional handover candidate cell is identified in the report.
  • the UE may set the link recovery cell identifier in the radio link failure report variable VarRLF-Report as the selected conditional handover candidate cell identifier.
  • Operation 1 The UE performs the Conditional handover, initiate a conditional handover process, apply the saved conditional handover configuration of the cell, and perform access to the selected cell; Operation 2: Store available wireless links in the UE's wireless link failure report variable In the case of path failure or handover failure information and the UE’s current public land mobile network PLMN is included in the PLMN identification list saved in the radio link failure report variable, the UE includes indication information in the conditional handover complete message , The indication information is used to indicate that there is saved available radio link failure or handover failure related information on the UE.
  • an RRC connection re-establishment process is initiated.
  • a user equipment including: a processor; and a memory storing instructions; wherein the instructions execute the wireless link failure recovery according to the context when the instructions are run by the processor method.
  • FIG. 1 is a sequence diagram showing that a user equipment UE in a connected state changes a serving cell through a handover process.
  • Fig. 2 is a schematic diagram showing the flow of condition switching.
  • Fig. 3 is a flowchart showing wireless link recovery based on conditional switching when the wireless link fails.
  • Fig. 4 is a block diagram showing a user equipment UE related to the present invention.
  • LTE Long Term Evolution
  • NR New Radio Access
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • handover refers to the change of the primary cell initiated by the network side, including the primary cell change between cells and the primary cell change within the cell, that is, the primary cell of the UE is changed from the source cell to the target cell, where the source cell
  • the target cell can be the same cell or a different cell.
  • the secret key or security algorithm used for access layer security can also be updated accordingly.
  • the source cell is also referred to as a source base station, and may also be a source beam (beam) or a source transmission point (TRP), and the target cell may also be referred to as a target base station, or it may be a target beam or a target transmission point.
  • the source cell refers to the cell that is connected to serve the UE before the handover process is initiated, that is, the cell from which the UE receives the RRC message containing the handover command.
  • the target cell refers to the cell that the UE connects to and serves the UE after the handover process is successfully completed, or the cell indicated by the target cell identifier included in the handover command, and the cell that the UE accesses when the handover is received.
  • the handover command described in the present disclosure is used to trigger the UE to perform handover.
  • it is an RRC reconfiguration message containing a synchronization reconfiguration (Reconfigurationwithsync) information element.
  • MCG master cell group
  • the RRC reconfiguration message of the reconfiguration (Reconfigurationwithsync) information element can also be referred to as the synchronous reconfiguration of the MCG.
  • the handover can also be referred to as the synchronous reconfiguration of the MCG.
  • the synchronization reconfiguration information element or the mobile control information information element contains the configuration information of the target cell, such as the target cell identity, the frequency of the target cell, the common configuration of the target cell, such as system information, and the random information used by the UE to access the target cell. Access configuration, UE's security parameter configuration in the target cell, UE's radio bearer configuration in the target cell, etc.
  • the RRC reconfiguration message in the present disclosure is equivalent to the RRC connection reconfiguration message; similarly, the response message RRC reconfiguration complete message is equivalent to the RRC connection reconfiguration complete message.
  • the RRC connection re-establishment request message is equivalent to the RRC re-establishment request message
  • the RRC re-establishment message is equivalent to the RRC connection re-establishment message; in the same way, the response message RRC re-establishment complete message is equivalent to the RRC connection re-establishment 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 the handover.
  • Switch configuration refers to all or part of the configuration in the switch command. Cancel, release, delete, empty and clear can be replaced. Execution, use and application can be replaced. Configuration and reconfiguration can be replaced. Links and connections can be replaced. Monitor and detect can be replaced. The conditional switching command and the conditional switching configuration can be replaced.
  • the UE after the UE receives a radio resource control (Radio Resource Control, RRC) message containing a handover command, it can still maintain the communication with the source base station, including data transmission, before initiating the handover process, so as to further reduce the interruption of data transmission. time.
  • RRC Radio Resource Control
  • FIG. 1 is a sequence diagram showing that a user equipment UE in a connected state changes a serving cell through a handover process.
  • the handover process generally includes the following stages:
  • Phase 1 Measurement phase.
  • the base station sends the measurement configuration to the user equipment (User Equipment, UE); the UE measures the radio link corresponding to the serving cell or neighboring cell based on the measurement configuration, and when the configured measurement reporting conditions are met, the UE sends the measurement to the base station report.
  • the measurement phase is not necessary, and the UE can be handed over blindly when the base station does not have a valid measurement report.
  • Phase 2 Handover preparation phase.
  • the base station determines whether to trigger a handover for the UE based on the received measurement report and other factors such as base station load. If it is determined to trigger a handover for the UE, the source base station initiates the handover preparation process by sending a handover request message to the target base station.
  • the target base station decides whether to accept this handover request for the UE according to the UE context in the handover request message and the available resources of the target base station, and if so, it will reply to the source base station with a handover confirmation message, where the handover confirmation message contains a base station Inter-node RRC messages are handover commands.
  • Phase 3 Switch execution phase.
  • the source base station issues the handover command to the UE and starts to forward the UE's data to the target base station.
  • the UE that receives the handover command immediately applies the configuration of the handover command to perform handover, accesses the target base station through a random access process, and sends a confirmation message to the target base station. Among them, the random access process is not necessary.
  • Phase 4 Handover completion phase. After the target base station confirms that the UE has successfully accessed, it sends a handover complete message to the source base station. According to this, the source base station can release the UE context stored on it.
  • the handover process in the current system will cause the interruption of data transmission.
  • the optimization of the handover process such as handover without random access process, will still connect before disconnection (Make Before Break, MBB). ) And so on are designed to reduce the data interruption time during the switching process.
  • condition-based switching As mentioned above, in the Release 16 technical requirements, it is required to meet the "0ms" data interruption delay as much as possible during the mobile handover process, and to improve the robustness of the handover to meet the mobility requirements of seamless handover in NR. In the current handover process, one of the reasons that cause the handover to fail and cause the data transmission to be interrupted for a long time is that the handover command is not issued in time and the handover command reception fails. For this problem, a feasible method is condition-based switching (referred to as conditional switching for short).
  • Fig. 2 is a schematic diagram showing the flow of condition switching.
  • a relatively conservative measurement report threshold is set so that the base station obtains the measurement result in advance, and performs handover preparation in advance based on the measurement result and the selected target base station, so that the base station can perform handover conditions 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 conditions is issued to the UE in advance, which carries the conditions for the UE to perform the handover.
  • the UE receives the conditional handover command, it does not immediately perform the handover, but saves the received handover command configuration, and starts to monitor the source cell according to the handover execution conditions carried in the handover command message.
  • conditional switching refers to a switching process that is executed only when one or more of the configured switching execution conditions are met.
  • the handover execution condition for example, the handover execution condition is a measurement event, for example, the condition is measurement event A3 (the signal quality of the neighboring cell is better than the serving cell for a period of time by more than an offset).
  • the neighboring cell corresponds to the target cell for handover.
  • all measurement events defined in the current 3GPP standard specifications 36.331 and 38.331 see chapter 5.5.4, such as A1 to A5 can be included in the conditional switching command as the switching execution condition.
  • the UE initiates an RRC connection re-establishment process to reestablish/restore the connection with the network side after the RLF of the primary cell group occurs or the UE performs the handover failure (HOF) (ie, T304 timeout).
  • HAF handover failure
  • the UE first performs a cell selection process to select a re-established cell, and sends an RRC connection re-establishment request message to it.
  • the UE When the UE receives the response message that is the RRC connection re-establishment message, the UE re-establishes the RRC connection according to the configuration in the RRC connection re-establishment message, and feeds back the RRC connection re-establishment complete message to the base station, and successfully ends the RRC connection re-establishment process.
  • the re-established cell refers to a cell used by the UE to send an RRC connection re-establishment request message and receive a corresponding response message for re-establishing an RRC connection in the RRC connected state.
  • a timer T311 is defined during the RRC re-establishment process.
  • T311 is started when the UE initiates the RRC connection re-establishment process.
  • stop T311 if T311 times out, the UE cannot select a suitable cell.
  • the UE is out of coverage, and the UE will Leave the RRC connected state and enter the RRC idle state or RRC inactive state (RRC_Inactive).
  • the UE In the current LTE system, the UE generates and saves a radio link failure report (RLF report) when a link failure or handover fails.
  • RLF report radio link failure report
  • the UE variable used to save the radio link failure report is VarRLF-Report.
  • the UE can inform the network side through an RRC message that there is an available radio link failure report (indicated by the rlf-InfoAvailable information element).
  • the UE can complete the RRC connection re-establishment complete message (RRCConnectionReestablishmentComplete) in the RRC connection re-establishment process, the RRC connection reconfiguration complete message (RRCConnectionReconfigurationComplete) in the RRC connection reconfiguration process, and the RRC connection establishment in the RRC connection establishment process.
  • the message (RRCConnectionSetupComplete) or the RRC connection recovery complete message (RRCConnectionResumeComplete) in the RRC connection recovery process informs the network-side UE that there is a saved 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 (the rlf-Report information element in the UEInformationResponse message indicates the request) 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 neighboring cells available when the link fails, location information, the primary cell identity where the link fails, the type of link failure (RLF or HOF), the reason for the RLF, and the slave The time from the connection failure to the reporting of the wireless link failure, the time from the last handover to the connection failure, etc.
  • the RRC re-establishment cell identity in the radio link failure report can provide additional auxiliary information for the network side.
  • the network side can consider that the UE did not find any suitable cell during the radio link recovery process after the link failure, that is, the RRC connection re-establishment process (suitable cell) ,
  • the UE may be in a coverage hole when a radio link failure occurs; if the RRC re-establishment cell identity in the radio link failure report is not the source cell where the UE is located when the failure occurs, the network side can consider the UE as a failure It's not because the switch is too early.
  • the above-mentioned RRC re-establishment cell identity is that the UE includes the identity of the RRC re-establishment cell that it attempts to re-establish the RRC connection in the radio link failure report after triggering the RRC connection re-establishment request message during the RRC connection re-establishment process.
  • the UE After the UE is configured with the conditional switching, it will not immediately perform the switching, but only after the corresponding condition is satisfied will it perform the switching according to the received or saved conditional switching configuration. During the period from the moment when the UE receives the conditional switching configuration to the execution of the switching according to the received conditional switching configuration, the UE still maintains communication with the source base station. During this period of time, a radio link failure (Radio Link Failure, RLF) between the UE and the source base station may occur. At the 106th meeting of the 3GPP RAN2 working group, the handover execution conditions for the above-mentioned conditional handover were not met and RLF occurred. A conclusion was reached: when RLF occurs, the UE first selects a cell to perform link recovery.
  • RLF Radio Link Failure
  • the UE performs handover to the cell according to the conditional handover configuration corresponding to the cell; if the selected cell is not a candidate for conditional handover, the UE sends an RRC connection establishment request to the selected cell to try Restore the connection with the network side.
  • This enhancement of the link recovery mechanism is referred to in the present disclosure as a link failure recovery mechanism based on a conditional switch configuration (for the convenience of description, it is referred to as a conditional switch link recovery mechanism for short).
  • the conditional handover candidate cell refers to the (target) cell in the conditional handover configuration in the RRC message for configuring the conditional handover received by the UE, that is, the synchronization reconfiguration information element (ReconfigurationWithSync) or the mobility control information element (MobilityControlInfo).
  • the cell identified by the cell ID.
  • the network side can configure one or more handover execution condition candidate cells for the UE at the same time.
  • the cell selection process can refer to 3GPP protocol specification 38.304 or 36.304. If the cell selected in the cell selection process is a cell of a different radio access technology (ie, an Inter-RAT cell), the UE performs the operation of entering the RRC idle state, and the reason for the RRC release is RRC connection failure. For the operation of entering the RRC idle state, refer to section 5.3.11 of the protocol specification 38.331.
  • the UE will only include the re-establishment cell identity in the radio link failure report after the RRC connection re-establishment request message is triggered when it tries the RRC connection re-establishment process to the network side.
  • the existing mechanism cannot achieve this function, which is a concern of the present disclosure.
  • the present disclosure proposes a solution to the problem of how to set the wireless link failure report in the conditional handover link recovery mechanism when the wireless link fails.
  • the UE can include the cell identifier that attempts to restore the connection in the radio link failure report and report it to the network side, thereby providing more auxiliary information for the network side to optimize mobile performance.
  • the UE when the UE is configured with conditional handover, the UE receives an RRC message containing a conditional handover command from the base station, saves the handover configuration in the handover command, and monitors the handover execution condition according to the handover execution condition Is it satisfied.
  • the handover configuration refers to the RRC configuration generated by the UE according to the configuration in the handover command.
  • the handover configuration refers to the RRC configuration generated by the UE according to the configuration in the handover command and/or the current RRC configuration of the UE.
  • the handover execution condition that is, the UE performs handover only when the condition is met, the handover configuration is applied, and the handover execution condition is included in a conditional handover command.
  • This embodiment provides a method for setting the cell identity in the radio link failure report in the link recovery mechanism using conditional handover when the radio link fails.
  • the network side can learn from the radio link failure report reported by the UE the identity of the cell where the UE is trying to connect and recover, so as to locate the network problem more accurately.
  • Optimize network configuration parameters such as switching threshold parameters.
  • Fig. 3 is a flowchart showing the wireless link recovery based on conditional switching when the wireless link fails. As shown in Fig. 3, the wireless link recovery under the conditional switching link recovery mechanism includes the following steps.
  • Step 1 The UE initiates the RRC connection re-establishment process.
  • Step 2 In the cell selection process in the RRC connection re-establishment process, when a suitable cell is selected, if the selected cell is a conditional handover candidate for the UE, perform step 3A; otherwise, if the selected cell If it is not a conditional handover candidate cell of the UE, step 3B is performed.
  • the selected suitable cell is an NR cell; in the LTE system, the selected suitable cell is an LTE/E-UTRAN cell.
  • Step 3A The UE performs the following operations:
  • the UE identifies the selected conditional handover candidate cell in the radio link failure report, for example, the UE sets a cell identification information element in the stored radio link failure report variable (VarRLF-Report) as the selected condition
  • the cell identity of the candidate cell for handover may be a global cell identifier that uniquely identifies a cell globally in a wireless communication system, or may be a physical cell identifier or a frequency where the cell is located.
  • the global cell identifier is Evolved Cell Global Identifier (ECGI), which is used to uniquely identify the cell in the LTE system.
  • ECGI Evolved Cell Global Identifier
  • the information element used to carry the cell identity can reuse the reestablishmentCellid information element in the existing mechanism, or it can be a newly defined information element different from the reestablishmentCellid information element, such as the conditional handover cell identity.
  • the conditional handover cell identity For example, expressed as a conditionalHOcellid information element), or a link recovery cell identifier (linkrecoverycellid or connectionrecoverycellid, recoverycellid information element).
  • the cell identifier is used to indicate the cell in which the UE performs a recovery attempt (conditional handover) during the recovery process after the radio link failure.
  • the name is not limited in this disclosure.
  • Operation 2 The UE performs conditional handover to the selected cell, initiates a conditional handover process, applies the saved conditional handover configuration of the cell, and executes access to the selected cell.
  • the operation 1 is performed before the operation 2, that is, after the UE determines that the appropriate cell selected in the cell selection process in step 2 is a candidate cell for conditional handover, the operation 1 is performed.
  • the operation 1 is completed after the operation 2 or during the execution of the operation 2, for example, the UE executes the operation 1 in the initialization phase of the condition switching initiated in the operation 2.
  • Step 3B Continue the RRC connection re-establishment process, such as initiating the sending of an RRC connection re-establishment request message.
  • the UE determines whether the selected cell is a candidate cell for conditional handover of the UE.
  • the reason for the conditional handover and/or the initiation of the RRC connection re-establishment process is monitoring It is executed when the MCG RLF or handover fails (that is, the timer used to detect the handover process (such as T304) expires, and the conditional handover failure is also included here).
  • the UE determining whether the selected cell is a candidate cell for conditional handover of the UE is performed when the UE is enabled with the conditional handover link recovery mechanism.
  • the selected cell is a conditional handover candidate cell. It can also be described as that the selected cell is included in the saved conditional handover configuration.
  • the synchronization reconfiguration information element (ReconfigurationWithSync) is included in the saved conditional handover configuration. ) Or in the mobile control information information element.
  • the UE performs handover to the selected cell, that is, performs handover to the cell according to the saved conditional handover configuration corresponding to the cell (or called synchronous reconfiguration). In this operation, the UE may not need to wait until the condition corresponding to the conditional handover candidate cell is satisfied, and then it can perform handover to the cell and resume communication with the network side as soon as possible.
  • the operation of performing conditional handover includes one or more of the following: starting the timer T304; performing the target cell RRC configuration in the conditional handover configuration corresponding to the target cell; performing the configuration in the synchronization reconfiguration information element corresponding to the target cell ; Downlink synchronization to the target cell; perform random access to the target cell; generate an RRC reconfiguration complete message and submit it to the lower layer for transmission.
  • This embodiment provides another method for setting the re-establishment cell identity in the radio link failure report in the conditional handover link recovery mechanism when the radio link fails.
  • the network side can learn from the radio link failure report reported by the UE the identity of the cell where the UE is trying to connect and recover, so as to locate the network problem more accurately. Optimize network configuration parameters such as switching threshold parameters.
  • the difference from Embodiment 1 is that the conditional handover recovery mechanism is not performed during the RRC connection re-establishment process. Instead, the UE configured with conditional handover will first perform a cell selection process when RLF occurs.
  • the UE performs handover to the cell according to the conditional handover configuration corresponding to the cell; if the selected cell is not a conditional handover candidate cell, the UE initiates the RRC connection re-establishment process.
  • Step 1 RLF occurs on the radio link of the UE. More precisely, RLF occurs on the MCG link. Or the UE has a handover failure (Handover Failure, HOF).
  • the handover failure can be judged based on the timeout of the timer used to monitor the handover process, such as T304 timeout.
  • the switching includes conditional switching.
  • the switching failure also includes the failure of the conditional switching process.
  • Step 2 If the UE is configured with conditional handover, the UE performs the conditional handover link recovery process. This includes performing a cell selection process. The cell selection process is performed in accordance with the cell selection process in the standard protocol specification 38.304 or 36.304. The execution condition of step 2 also includes that the UE is enabled with the conditional handover link recovery mechanism.
  • conditional handover configured for the UE is equivalent to that the UE has a saved conditional handover configuration.
  • Step 3 The cell selection process of step 2 selects a suitable cell.
  • a suitable cell if the selected cell is a conditional handover candidate cell of the UE, step 4A is performed; otherwise, if the selected cell is not a conditional handover candidate cell of the UE, step 4B is performed.
  • the selected suitable cell is an NR cell; in the LTE system, the selected suitable cell is an LTE/E-UTRAN cell.
  • Step 4A The UE performs the following operations:
  • the UE sets a cell identification information element in the stored radio link failure report variable (VarRLF-Report) as the cell identification of the selected conditional handover candidate cell.
  • the cell identifier may be a global cell identifier that uniquely identifies a cell globally in a wireless communication system, or may be a physical cell identifier or a frequency where the cell is located.
  • the global cell identifier is Evolved Cell Global Identifier (ECGI), which is used to uniquely identify the cell in the LTE system.
  • ECGI Evolved Cell Global Identifier
  • the information element used to carry the cell identity can reuse the reestablishmentCellid information element in the existing mechanism, or it can be a newly defined information element different from the reestablishmentCellid information element, such as the conditional handover cell identity.
  • the conditional handover cell identity For example, expressed as a conditionalHOcellid information element), or a link recovery cell identifier (linkrecoverycellid or connectionrecoverycellid, recoverycellid information element).
  • the cell identifier is used to indicate the cell where the UE performs a recovery attempt (conditional handover) during the link recovery process after the radio link failure or handover failure.
  • the name is not limited in this disclosure.
  • Operation 2 The UE performs conditional handover to the selected cell, initiates a conditional handover process, applies the saved conditional handover configuration of the cell, and executes access to the selected cell.
  • the operation 1 is performed before the operation 2, that is, after the UE determines that the appropriate cell selected in the cell selection process in step 2 is a candidate cell for conditional handover, the operation 1 is performed.
  • the operation 1 is completed after the operation 2 or during the execution of the operation 2, for example, the UE executes the operation 1 in the initialization phase of the condition switching initiated in the operation 2.
  • Step 4B Initiate an RRC connection re-establishment process.
  • the UE determines whether the selected cell is a candidate cell for conditional handover of the UE.
  • the reason for the conditional handover and/or the initiation of the RRC connection re-establishment process is monitoring when the UE is configured with conditional handover. It is executed when the MCG RLF or handover fails (that is, the timer used to detect the handover process (such as T304) expires, and the conditional handover failure is also included here).
  • the UE determining whether the selected cell is a candidate cell for conditional handover of the UE is performed when the UE is enabled with the conditional handover link recovery mechanism.
  • the selected cell is a conditional handover candidate cell. It can also be described as that the selected cell is included in the saved conditional handover configuration.
  • the synchronization reconfiguration information element (ReconfigurationWithSync) is included in the saved conditional handover configuration. ) Or in the mobile control information information element.
  • the UE performs handover to the selected cell, that is, performs handover to the cell according to the saved conditional handover configuration corresponding to the cell (or called synchronous reconfiguration). In this operation, the UE may not need to wait until the condition corresponding to the conditional handover candidate cell is satisfied, and then it can perform handover to the cell and resume communication with the network side as soon as possible.
  • the operation of performing conditional handover includes one or more of the following: starting the timer T304; performing the target cell RRC configuration in the conditional handover configuration corresponding to the target cell; performing the configuration in the synchronization reconfiguration information element corresponding to the target cell ; Downlink synchronization to the target cell; perform random access to the target cell; generate an RRC reconfiguration complete message and submit it to the lower layer for transmission.
  • the UE when the UE performs the conditional switching process before or during the process, if the radio link failure or the switching failure process occurs before the conditional switching process (just before), that is to say, The execution of the conditional handover process is triggered when the link fails to restore the link connection, and the UE will include an indication information for indicating the identity of the target cell of the conditional handover in the saved radio link failure report to Notifying the network side that the UE has performed conditional handover in the cell corresponding to the cell identifier to restore the connection.
  • This embodiment provides a method for the UE to report a radio link failure report to the network, which is executed when the UE is configured with conditional switching.
  • Step 1 The UE initiates conditional handover and performs access to the selected candidate cell for conditional handover.
  • the UE-initiated conditional switching is initiated when the conditional switching execution condition monitored by the UE is satisfied.
  • the access process performed by the UE to the selected candidate cell for conditional handover is as described above, and will not be repeated here.
  • Step 2 If the available radio link failure or handover failure information is stored in the UE's radio link failure report variable and the UE's current public land mobile network (Public Land Mobile Network, PLMN) is included in the radio link failure report variable
  • the UE includes an indication information in the conditional handover complete message.
  • the indication information is used to indicate that there is saved available radio link failure or handover failure related information on the UE.
  • the current PLMN of the UE is a PLMN (Registered PLMN, RPLMN) currently registered by the UE.
  • FIG. 4 is a block diagram showing a user equipment UE related to the present invention.
  • the user equipment UE40 includes a processor 401 and a memory 402.
  • the processor 401 may include, for example, a microprocessor, a microcontroller, an embedded processor, and the like.
  • the memory 402 may include, for example, volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memories.
  • the memory 402 stores program instructions. When the instruction is run by the processor 401, it can execute the above-mentioned wireless link recovery method described in detail in the present invention.
  • base station refers to a mobile communication data and control switching center with larger transmission power and wider coverage area, including functions such as resource allocation and scheduling, data reception and transmission.
  • User equipment refers to user mobile terminals, such as mobile phones, notebooks, and other terminal devices that can communicate with base stations or micro base stations wirelessly.
  • the method and related equipment 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 method of the present disclosure is not limited to the steps and sequence shown above.
  • the base station and user equipment shown above may include more modules, for example, may also include modules that can be developed or developed in the future that can be used for base stations, MMEs, or UEs, and so on.
  • 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. Those skilled in the art can make many changes and modifications based on the teaching of the illustrated embodiment.
  • the program running on the device may be a program that causes the computer to implement the functions of the embodiments of the present disclosure by controlling a central processing unit (CPU).
  • the program or the information processed by the program can 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.
  • the program for realizing the functions of the various embodiments of the present disclosure may be recorded on a computer-readable recording medium.
  • Corresponding functions can be realized by causing the computer system to read the programs recorded on the recording medium and execute these programs.
  • the so-called "computer system” herein may be a computer system embedded in the device, and 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 storing a program dynamically for a short period of time, 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 can include general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, discrete Gate or transistor logic, discrete hardware components, or any combination of the above devices.
  • the general-purpose processor may be a microprocessor, or any existing processor, controller, microcontroller, or state machine.
  • the above-mentioned circuit can be a digital circuit or an analog circuit. In the case of new integrated circuit technologies that 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-mentioned embodiments. Although various examples of the embodiment 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.

Abstract

La présente invention concerne un procédé de reprise après défaillance de liaison radio et un équipement utilisateur. Le procédé de reprise après défaillance de liaison radio comprend les étapes suivantes : un équipement utilisateur (UE) engageant un processus de rétablissement de la connexion de contrôle des ressources radio (RRC); et dans un processus de sélection de cellule du processus de rétablissement de connexion RRC, l'UE marquant, dans un rapport de défaillance de liaison radio, une cellule candidate au transfert conditionnel sélectionnée dans les cas où la cellule sélectionnée est la cellule candidate au transfert conditionnel de l'UE.
PCT/CN2020/116745 2019-09-27 2020-09-22 Procédé de reprise après défaillance de liaison radio et équipement utilisateur WO2021057702A1 (fr)

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CN115604771A (zh) * 2021-07-07 2023-01-13 维沃移动通信有限公司（Cn） Cho配置信息的优化方法及装置
WO2023159492A1 (fr) * 2022-02-25 2023-08-31 Oppo广东移动通信有限公司 Procédé de communication sans fil et dispositifs terminaux
CN116709439A (zh) * 2022-02-28 2023-09-05 华为技术有限公司 一种通信方法及装置
CN117750447A (zh) * 2022-09-15 2024-03-22 夏普株式会社 由用户设备执行的方法以及用户设备

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