WO2020221193A1 - 条件切换方法及对应的用户设备 - Google Patents

条件切换方法及对应的用户设备 Download PDF

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Publication number
WO2020221193A1
WO2020221193A1 PCT/CN2020/087165 CN2020087165W WO2020221193A1 WO 2020221193 A1 WO2020221193 A1 WO 2020221193A1 CN 2020087165 W CN2020087165 W CN 2020087165W WO 2020221193 A1 WO2020221193 A1 WO 2020221193A1
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Prior art keywords
conditional
switching
handover
configuration
rrc
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PCT/CN2020/087165
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English (en)
French (fr)
Inventor
常宁娟
刘仁茂
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夏普株式会社
常宁娟
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Publication of WO2020221193A1 publication Critical patent/WO2020221193A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • 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
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • 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

Definitions

  • the present disclosure relates to the field of wireless communication technology, and more specifically, the present disclosure relates to a conditional switching method and corresponding user equipment.
  • 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 is 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 performs handover according to the handover command received before when the configured conditions are met. In this way, the early issuance of the handover command can increase the success rate of handover command reception, thereby increasing 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 NR systems and LTE (Long Term Evolution) systems.
  • 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 proposes a solution to the problem of how the UE receives the RRC message from the source cell in the process of performing conditional handover.
  • the embodiments of the present disclosure provide a conditional switching method executed by a user equipment and corresponding user equipment.
  • a method for conditional handover performed by a user equipment includes the following steps: a conditional handover monitoring step.
  • the user equipment UE receives a radio resource control RRC message containing a conditional handover command from a source base station, and saves it.
  • conditional switching configuration in the conditional switching command and monitoring whether the switching condition is satisfied according to the switching condition
  • conditional switching execution step when the UE monitors that the switching condition in the saved conditional switching configuration is satisfied, initiate the conditional switching
  • the UE that is performing conditional switching receives the RRC message from the source base station
  • the conditional switching stop step the UE stops the ongoing conditional switching process
  • the RRC configuration step is executed, and the UE receives the message received during the ongoing conditional switching process
  • the configuration in the RRC message executes the corresponding configuration.
  • the RRC message from the source base station received by the UE that is performing the conditional handover includes the following situations: Case 1: The RRC message includes a handover command; Case 2: The RRC message includes configuration information for conditional handover, and the configuration information for conditional handover includes indication information for releasing the target cell of the UE currently undergoing handover; case 3: the RRC message includes Configuration information for conditional handover, and the configuration information for conditional handover includes modification information related to the target cell of the UE currently undergoing handover process; Case 4: The RRC message includes configuration for conditional handover Information, and the configuration information for conditional switching includes information for instructing the UE to release the saved conditional switching command configuration; case 5: the RRC message includes configuration information for conditional switching, and the The configuration information for conditional handover includes the configuration information of other conditional handover candidate cells that are irrelevant or different from the target cell of the UE currently undergoing handover process; case 6: the
  • the performing RRC configuration step is performed after the conditional switching stopping step is performed, or the conditional switching is performed after performing the RRC configuration performing step. Stop the step.
  • the performing the RRC configuration step is performed after the RRC message receiving step is performed, including: the UE suspends the currently ongoing conditional handover Process: Determine whether the reconfiguration handover condition associated with the target cell associated with the ongoing conditional handover in the conditional handover configuration in the received RRC message is still met.
  • conditional handover configuration in the received RRC message it is preferable that when the conditional handover configuration in the received RRC message is determined, the reconfiguration handover condition associated with the target cell associated with the ongoing conditional handover is determined When it is still met, the UE continues the current conditional switching; otherwise, the UE executes the conditional switching stop step to stop the ongoing conditional switching process.
  • the UE performs one or more of the following operations to stop the ongoing conditional switching process: Operation 1: Stop timing Operation 2: Stop the ongoing random access process; Operation 3: Cancel the sending of the RRC reconfiguration complete message in the conditional switching execution step; Operation 4: Release the RRC entity associated with the target cell; Operation 5: Generate a failure report information, and include the failure report information in the response message sent to the source base station or in the response message sent to the target base station; Operation 6: Consider that the conditional switching process is over.
  • a method for conditional handover performed by a user equipment includes the following steps: a conditional handover monitoring step.
  • the user equipment UE receives a radio resource control RRC message containing a conditional handover command from a source base station, and saves it.
  • conditional switching configuration in the conditional switching command and monitoring whether the switching condition is satisfied according to the switching condition; the conditional switching execution step, when the UE monitors that the switching condition in the saved conditional switching configuration is satisfied, initiate the conditional switching; RRC message receiving step, the UE that is performing conditional handover receives the RRC message from the source base station; the conditional handover continues to perform the step, the UE does not apply or perform the RRC message received during the ongoing conditional handover to continue the ongoing conditional handover process.
  • the UE performs one or more of the following methods, not applying or not performing the receiving during the ongoing conditional handover process:
  • the received RRC message continues the ongoing conditional handover process: when the RRC layer receives the RRC message from the source base station, it ignores or discards the received RRC message; when the media access control MAC layer receives a logical channel identification indication When the MAC protocol data unit PDU or the service data unit SDU corresponds to the dedicated control channel DCCH, the MAC layer discards the MAC PDU or MAC SDU.
  • conditional handover configuration and the handover condition are associated with the target cell.
  • a user equipment which includes: a processor; and a memory on which instructions are stored; when the instructions are executed by the processor, the user equipment executes The conditional switching method described in the article.
  • the UE can initiate the conditional handover process to access the target base station but has received the RRC configuration message from the source base station. Avoid the time delay and signaling overhead caused by incorrect handover or handover failure, and optimize the mobile performance of the system. In other words, it is possible to meet the "0ms" data interruption delay as much as possible during the mobile handover process, and improve the robustness of handover to meet the mobility requirements of seamless handover in NR.
  • Figure 1 is a flowchart of a general handover process in an LTE/NR system.
  • FIG. 2 is a schematic diagram of a conditional handover method performed by a user equipment UE related to Embodiment 1 of the present disclosure.
  • FIG. 3 is a flowchart of a method for conditional handover performed by a user equipment UE according to Embodiment 1 of the present disclosure.
  • Fig. 4 is a schematic diagram of a conditional handover method performed by a user equipment UE related to Embodiment 2 of the present disclosure.
  • FIG. 5 is a flowchart of a method for conditional handover performed by a user equipment UE according to Embodiment 2 of the present disclosure.
  • Fig. 6 is a brief structural block diagram of a user equipment UE involved in the present disclosure.
  • LTE Long Term Evolution
  • NR New Radio Access
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • the source cell can also be referred to as a source base station, a source beam (beam), a source transmission point (Transmission Point, TRP), and a target cell can also be referred to as a target base station, or a target beam or target transmission point.
  • the source cell refers to the connected base station serving the UE before the handover process is initiated, that is, the base station that sends the RRC message containing the handover command to the UE.
  • the target cell refers to the base station serving the UE to which the UE is connected after the handover process is successfully completed, or the cell indicated by the target cell identifier included in the handover command.
  • the handover command described in the present disclosure is used to trigger the UE to perform handover.
  • the NR system In the NR system, it is an RRC reconfiguration message including a reconfiguration with sync information element.
  • it is an RRC connection reconfiguration message containing an information element of mobility control information (MobilityControlInformation).
  • MobilityControlInformation mobility control information
  • the synchronization reconfiguration information element or the mobile control information information element contains the configuration information of the target base station, such as the target cell identifier, the target cell frequency, 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 security parameter configuration in the target cell, UE 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 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. Conditional switching commands and conditional switching configurations can be replaced. Monitoring (monitor) and detection (detect) can be replaced.
  • the UE after the UE receives a radio resource control (Radio Resource Control, RRC) message containing a handover command, it still maintains 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
  • a handover process which refers to a process in which a UE in an RRC connected state changes a serving cell.
  • a handover process which refers to a process in which a UE in an RRC connected state changes a serving cell.
  • Phase 1 Measurement phase.
  • the base station sends the measurement configuration to the 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. If possible, 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 a 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. The source base station can release the UE context stored on it accordingly.
  • 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 technical requirements of Release 16, 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 handover to meet the mobility requirements of seamless handover in NR.
  • the handover command reception failure caused by the untimely issuing of the handover command.
  • condition-based switching condition switching for short.
  • 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 conditions under real handover conditions (relative to the conservative Before the measurement report threshold is met, the handover command is issued to the UE in advance, which carries the conditions for the handover execution.
  • the UE receives the handover command, it does not immediately perform the handover, but saves the received handover command configuration, and monitors the link quality of the source cell according to the handover condition carried in the handover command message Or the link quality of the target cell.
  • the UE Only when it is monitored that the configured handover condition is met, the UE starts to execute the saved handover command and access to the target cell.
  • the switching mechanism the present disclosure refers to conditional switching, but does not limit its naming. It can also be called the switching mechanism of the advance switching command, the advance switching, and the early switching preparation.
  • conditional switching after the UE initiates the conditional switching, the source cell maintains the UE's RRC connection before successfully sending the RRC reconfiguration complete message to the target base station. In other words, the UE still maintains the RRC connection with the source base station before successfully sending the RRC reconfiguration complete message to the target base station.
  • conditional handover the UE determines when to initiate the handover execution phase, and the source base station serving the UE cannot know in time. This may happen that the UE has initiated the conditional handover process to access the target base station but has received The situation of the RRC configuration message of the base station.
  • the present disclosure proposes the following implementation methods on how the UE operates in this situation, so that the UE can process the received RRC message in this situation, thereby avoiding the delay and time caused by incorrect handover or handover failure.
  • Signaling overhead optimizes the mobile performance of the system.
  • the RRC configuration message received from the source base station includes but is not limited to The following situations:
  • the RRC message contains a handover command.
  • the switching command is a traditional switching command, that is, it is not a switching command for conditional switching.
  • the RRC message includes configuration information for conditional handover, and the configuration information for conditional handover includes indication information for releasing the target cell of the handover process currently being performed by the UE.
  • the target cell of the conditional handover procedure currently being performed by the UE and the conditional handover candidate cell indicated to be released in the conditional handover configuration in the RRC message are the same; or the target cell of the conditional handover procedure currently being performed by the UE is the same.
  • One of the multiple conditional handover candidate cells indicated to be released in the conditional handover configuration in the RRC message is the same.
  • the RRC message includes configuration information for conditional handover, and the configuration information for conditional handover includes modification information related to the target cell of the UE currently undergoing handover, such as the associated condition Reconfiguration information.
  • the RRC message contains the reconfiguration information related to the target cell configuration of the conditional handover process currently being performed by the UE.
  • the RRC message contains configuration information for conditional handover, and the configuration information for conditional handover includes the configuration information for disabling conditional switching or instructing the UE to release the saved conditional switching command configuration Information.
  • the RRC message includes configuration information for conditional handover, and the configuration information for conditional handover includes other conditional handover equipment that is not related to or different from the target cell of the UE currently undergoing handover. Select the configuration information of the cell. In other words, the RRC message is used to configure or modify other conditional handover candidate cell configuration information.
  • the RRC message contains configuration information not used for handover and conditional handover.
  • the RRC message is not RRC reconfiguration information, or the RRC message is RRC reconfiguration information that does not include a synchronization reconfiguration information element or a mobility control information information element. That is, the RRC message is not used for handover, for example, it is used to configure the addition and modification of the secondary cell.
  • the conditional handover candidate cell refers to the conditional handover command in the RRC message for configuring the conditional handover received by the UE or the (target) cell in the conditional handover configuration.
  • the network side can simultaneously configure one or more handover condition candidate cells for the UE.
  • conditional switch in progress can also be described as initiating the conditional switch.
  • the process will be described using Figure 2 and Figure 3.
  • Step S301 Initiate conditional switching (conditional switching execution step).
  • the initiating condition switching is initiated when the UE detects that the switching conditions in the saved condition switching configuration are satisfied.
  • the conditional handover configuration and the handover condition are associated with the target cell.
  • the operation of initiating conditional handover includes one or more of the following: starting timer T304; executing target cell RRC configuration in the conditional handover configuration corresponding to the target cell; executing synchronization reconfiguration information element corresponding to the target cell The configuration in the system; 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 maintains two sets of access layer protocol stacks (user plane protocol stack or control plane protocol stack) for the source cell and the target cell simultaneously during the handover process.
  • the operation of initiating conditional handover also includes establishing an associated L1/L2 entity or RRC entity for the target cell.
  • the L2 entity includes a Service Data Adaptation Protocol (SDAP) entity or a Packet Data Covergence Protocol (PDCP) entity or a Radio Link Control (RLC) entity or media access control (Medium Access Control, MAC) entity.
  • SDAP Service Data Adaptation Protocol
  • PDCP Packet Data Covergence Protocol
  • RLC Radio Link Control
  • One or more of the operations of the UE initiating conditional handover are performed in the RRC entity associated with the target cell. For example, the operation of generating an RRC reconfiguration complete message and submitting it to the lower layer for sending is performed in the RRC entity associated with the target cell , Random access to the target cell is performed in the MAC entity associated with the target cell.
  • Step S302 The UE that is performing conditional switching receives the RRC message from the source base station (RRC message receiving step).
  • the RRC message includes the aforementioned 6 situations.
  • Step S303 The UE performs one or more of the following operations to stop the ongoing conditional switching process (conditional switching stop step).
  • Operation 1 Stop timer T304 or consider that T304 has timed out.
  • Operation 2 Stop the ongoing random access process.
  • the stopping of the ongoing random access process is implemented by resetting or releasing the MAC entity.
  • the MAC entity is a MAC entity associated with the target cell.
  • Operation 3 cancel the sending of the RRC reconfiguration complete message in step S301.
  • the sending of the RRC reconfiguration cancellation complete message is realized by rebuilding or releasing the L2 entity corresponding to SRB1.
  • the L2 entity is a PDCP entity or a radio link control RLC entity.
  • the L2 entity is the L2 entity associated with the target cell, or the L2 entity associated with the target cell established in step S301.
  • Operation 4 Release the RRC entity associated with the target cell.
  • the RRC entity is the RRC entity associated with the target cell established in step S301.
  • Operation 5 Generate a failure report information, and include the failure report information in the response message sent to the source base station (for example, in cases 2 to 6) or in the response message sent to the target base station (for example, in case 1) ).
  • the failure report information includes indication information that the UE has an ongoing conditional handover process or the current valid measurement result of the UE.
  • the indication information that the UE has an ongoing conditional switching process includes an indication that the UE has initiated or ongoing conditional switching process when it receives the RRC message in step S302 above, or whether the UE has received the conditional switching process in step S302.
  • the target cell information (identity or frequency of the accessed target cell) associated with the initiated or ongoing conditional handover process during the RRC message.
  • Operation 6 It is considered that the condition switching process is over.
  • Step S304 The UE performs corresponding configuration according to the configuration in the RRC message received in step S302 (execute the RRC configuration step). Optionally, it also includes sending a response message to the source cell to respond to the RRC message received in step S302.
  • step S303 and step S304 is not limited.
  • step S304 may be performed after step S303 is performed, or step S303 may be performed after step S304 is performed.
  • step S304 is executed after step S302 is executed, which includes: the UE suspends the currently ongoing conditional switching process; determining the status of the ongoing conditional switching in the conditional switching configuration in the received RRC message Whether the reconfiguration handover condition associated with the associated target cell is still met. If yes, the UE continues the current conditional switching process; if not, the UE executes step S303 to stop the ongoing conditional switching process.
  • the suspension of the currently ongoing conditional handover process by the UE refers to the suspension of related operations of the handover process.
  • this embodiment further includes before step S301: step S300, the UE receives an RRC message containing a conditional switching command from the source base station, saves the conditional switching configuration in the conditional switching command, and monitors the switching according to the switching conditions Whether the condition is met (condition switching monitoring step).
  • the conditional switching configuration refers to the RRC configuration generated by the UE according to the configuration in the conditional switching command.
  • the switching configuration refers to the RRC configuration generated by the UE according to the configuration in the switching command and the current RRC configuration of the UE. Configuration.
  • the handover condition that is, the UE performs handover only when the condition is met, the handover configuration is applied, and the handover condition is included in the conditional handover command.
  • the handover condition is a measurement event
  • the condition is measurement event A3 (the signal quality of the neighboring cell exceeds an offset of the serving cell for a period of time).
  • the neighboring cell corresponds to the target cell of handover.
  • all measurement events defined in the current 3GPP standard specifications see section 5.5.4 in 36.331 and 38.331), such as A1 to A5, can be included in the conditional switching command as a switching condition.
  • condition switching being performed can also be described as initiating the condition switching or the timer T304 for the condition switching is running. Hereinafter, the process will be described using FIG. 4 and FIG. 5.
  • Step S501 Initiate conditional switching (conditional switching execution step).
  • the initiating condition switching is initiated when the UE detects that the switching conditions in the saved condition switching configuration are satisfied.
  • the conditional handover configuration and the handover condition are associated with the target cell.
  • the operation of initiating conditional handover includes one or more of the following: starting timer T304; executing target cell RRC configuration in the conditional handover configuration corresponding to the target cell; executing synchronization reconfiguration information element corresponding to the target cell The configuration in the system; 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 maintains two sets of access layer protocol stacks (user plane protocol stack or control plane protocol stack) for the source cell and the target cell simultaneously during the handover process.
  • the operation of initiating conditional handover also includes establishing an associated L1/L2 entity or RRC entity for the target cell.
  • the L2 entity includes a Service Data Adaptation Protocol (SDAP) entity or a Packet Data Covergence Protocol (PDCP) entity or a Radio Link Control (RLC) entity or media access control (Medium Access Control, MAC) entity.
  • SDAP Service Data Adaptation Protocol
  • PDCP Packet Data Covergence Protocol
  • RLC Radio Link Control
  • One or more of the operations of the UE initiating conditional handover are performed in the RRC entity associated with the target cell. For example, the operation of generating an RRC reconfiguration complete message and submitting it to the lower layer for sending is performed in the RRC entity associated with the target cell , Random access to the target cell is performed in the MAC entity associated with the target cell.
  • Step S502 The UE that is performing conditional switching receives an RRC message from the source base station (RRC message receiving step).
  • the RRC message includes the aforementioned 6 situations.
  • Step S503 The UE executes one or more of the following methods without applying or executing the RRC message received in the ongoing conditional switching process to continue the ongoing conditional switching process (conditional switching continues execution step).
  • the UE RRC layer when the UE RRC layer receives the RRC message from the source base station, it ignores or discards the received RRC message.
  • the RRC layer is the RRC layer/entity associated with the source base station.
  • the MAC layer receives a logical channel identifier indicating that the MAC protocol data unit (Packet Data Unit, PDU) or service data unit (Service Data Unit, SDU) corresponds to a dedicated control channel (Dedicated Control CHannal, DCCH), the MAC The layer discards the MAC PDU or MAC SDU, that is, does not deliver the data packet to the upper layer. In this way, the MAC layer discards or does not deliver the data packet received on SRB1 to the upper layer after initiating a random access procedure to the target cell or after initiating a condition switch.
  • the MAC layer/entity is the MAC layer/entity associated with the source base station.
  • the MAC entity learns the information about the current conditional handover from the RRC layer or learns from the MAC entity associated with the target cell in the dual protocol stack. In other words, after the conditional handover is initiated, the RRC layer or the MAC entity associated with the target cell sends an indication to the MAC entity associated with the source cell to inform that the conditional handover is in progress or has been initiated.
  • this embodiment further includes before step S501: step S500, the UE receives an RRC message containing a conditional switching command from the source base station, saves the conditional switching configuration in the conditional switching command, and monitors the switching according to the switching conditions Whether the condition is met (condition switching monitoring step).
  • the conditional switching configuration refers to the RRC configuration generated by the UE according to the configuration in the conditional switching command.
  • the switching configuration refers to the RRC configuration generated by the UE according to the configuration in the switching command and the current RRC configuration of the UE.
  • Configuration The handover condition, that is, the UE performs handover only when the condition is met, and the handover configuration is applied.
  • the handover condition is a measurement event, for example, the condition is measurement event A3 (the signal quality of the neighboring cell exceeds an offset of the serving cell for a period of time).
  • the neighboring cell corresponds to the target cell of handover.
  • the UE no longer processes the RRC messages from the source cell or to be sent to the source cell after initiating conditional switching, which is similar to the second embodiment. Execute on the UE. That is to say, during the conditional handover process (the timer T304 for conditional handover is running), the RRC message from or to be sent to the source cell is no longer processed.
  • Step 1 Initiate a conditional switch.
  • Step 2 Suspend Signaling Radio Bearer 1 (Signalling Radio Bearer 1, SRB1). Optionally, it also includes rebuilding the PDCP or RLC corresponding to the SRB1.
  • the RRC here refers to the RRC associated with the source cell, and the PDCP or RLC refers to the PDCP or RLC associated with the source cell.
  • Step 3 After the random access process for accessing the target cell is completed or the RRC reconfiguration complete message generated and sent to the target cell during the process is successfully sent, the SRB1 is restored.
  • the restoring SRB1 also includes considering that the SRB1 is connected to the target cell.
  • the source base station associated with the SRB1 and its associated RRC entity or L2 entity after the random access process for accessing the target cell is completed or after the RRC reconfiguration complete message generated and sent to the target cell in the process is successfully sent, the source base station associated with the SRB1 and its associated RRC entity or L2 entity.
  • This embodiment provides a method for ending the conditional handover RRC process.
  • the UE Before the end of the RRC process of conditional handover, the UE will not process the RRC message from the source base station, so that the ongoing conditional handover process will not be interrupted.
  • This embodiment can also be applied to a handover process that uses a handover mechanism that communicates with the source cell and the target cell at the same time during the handover process (this process is not a conditional handover process, and can be referred to as enhanced keep-alive before disconnection (enhanced Make Before Break, eMBB) mechanism or simultaneous connection switching mechanism or dual connection switching mechanism or non-separated bearer switching mechanism.)
  • enhanced keep-alive before disconnection enhanced Make Before Break, eMBB
  • Step 1 Initiate the handover process.
  • the switching process may be a conditional switching process or an eMBB switching process.
  • the operation of initiating the switching process of eMBB is similar to the operation of initiating conditional switching.
  • this step it includes generating an RRC reconfiguration complete message and delivering it to the lower layer through SRB1 for transmission.
  • the RRC reconfiguration complete message is sent using the new configuration (that is, the configuration corresponding to the target cell included in the corresponding handover command).
  • Step 2 When the lower layer confirms the sending of the RRC reconfiguration complete message (success), the RRC process is ended, that is, the switching process of the switching command RRC message is executed, and the T304 timer is stopped.
  • the lower layer confirms that the RRC reconfiguration complete message is sent successfully it can also be expressed as when an indication that the RRC reconfiguration complete message sent from the lower layer has been sent (successfully) is received.
  • this embodiment can be expressed as follows.
  • Step 1 When the RRC reconfiguration message is received, the configuration in the RRC reconfiguration message is applied.
  • conditional handover because the RRC reconfiguration message containing the conditional handover command is not applied immediately, but is received in advance and saved on the UE, the said when the RRC reconfiguration message is received refers to the handover condition When the conditions for initiating handover are met.
  • the configuration in the application RRC reconfiguration message includes generating an RRC reconfiguration complete message and delivering it to the lower layer through SRB1 for transmission.
  • the sending of the RRC reconfiguration complete message uses the new configuration (that is, the configuration included in the corresponding RRC reconfiguration message).
  • it also includes the aforementioned operation of initiating conditional switching.
  • Step 2 If the synchronization reconfiguration (reconfigurationwithsync) information element is included in the special cell configuration (spcellconfig) information element and the process is a conditional handover or eMBB handover process, when the lower layer confirms that the RRC reconfiguration complete message is sent (successfully), Ending the RRC process is to execute the switching process of the switching command RRC message, and stop the timer T304.
  • the lower layer confirms the sending (successful) of the RRC reconfiguration complete message, it can also be expressed as when an indication that the RRC reconfiguration complete message has been sent (successful) from the lower layer is received.
  • the MAC successfully completes a random access process triggered in step 1 of the RRC process, End the RRC process and stop the timer T304.
  • the synchronization reconfiguration information element corresponds to the NR system.
  • the mobility control information element mobility controlInfo
  • the MAC indicates that the UE-specific identification (such as cell wireless
  • C-RNTI physical downlink control channel
  • the special cell configuration information element includes the configuration parameters of the special cell of the primary cell group (primary cell PCell) or the special cell of the secondary cell group (primary and secondary cell PSCell).
  • Embodiment 2 differs from Embodiment 1 in that when the UE receives an RRC message from the source cell during the ongoing conditional handover process (T304 for conditional handover is running), it judges the link status of the source cell. The decision is to stop or continue the condition switching process.
  • Step 1 Same as step S301 in embodiment 1.
  • Step 2 Same as step S302 in the first embodiment.
  • Step 3 Determine whether the source cell link meets the conditions. If it is not met, stop the ongoing conditional switching process, that is, perform step S303 and step S304 in Embodiment 1; if it is met, continue the ongoing conditional switching process, do not execute/discard the received in step 2 RRC news.
  • whether the condition is met or not refers to whether the timer T310 or T312 is running. If T310 or T312 is running, the condition is met; if T310 or T312 is not running, the condition is not met.
  • the T310 or T312 is used to monitor the failure of the wireless link, and refer to the 3GPP protocol specification document 36.331 or 38.331.
  • whether the condition is satisfied means that the channel quality measurement value, such as the reference signal received power RSRP, is lower than a threshold. If the channel quality measurement value is lower than a threshold value, it is considered to meet the condition; if the channel quality measurement value is higher than a threshold value, it is considered that the condition is not satisfied.
  • the channel quality measurement value such as the reference signal received power RSRP
  • This embodiment differs from embodiment 1 in that when the UE receives an RRC message from the source cell during the ongoing conditional handover process (the T304 for conditional handover is running), it judges the link status of the target cell. The decision is to stop or continue the condition switching process.
  • Step 1 Same as step S301 in embodiment 1.
  • Step 2 Same as step S302 in the first embodiment.
  • Step 3 Determine whether the target cell link meets the conditions. If it is not met, the ongoing conditional switching process is continued, and the RRC message received in step 2 is not executed/discarded. If it is satisfied, the ongoing condition switching process is stopped, that is, step S303 and step S304 in Embodiment 1 are executed.
  • whether the condition is satisfied refers to whether the timer T310 or T312 is running. If T310 or T312 is running, the condition is met; if T310 or T312 is not running, the condition is not met.
  • the T310 or T312 is used to monitor the failure of the wireless link, and refer to the 3GPP protocol specification document 36.331 or 38.331.
  • whether the condition is satisfied means that the channel quality measurement value, such as the reference signal received power RSRP, is higher than a threshold. If the channel quality measurement value is higher than a threshold value, it is considered that the condition is not satisfied; if the channel quality measurement value is lower than a threshold value, it is considered that the condition is satisfied.
  • the channel quality measurement value such as the reference signal received power RSRP
  • This embodiment provides a processing method in which a UE receives an RRC message from a source cell during an ongoing conditional handover process (T304 for conditional handover is running) and the integrity check of the RRC message fails.
  • Step 1 Same as step S301 in embodiment 1.
  • Step 2 Same as step S302 in the first embodiment.
  • Step 3 If the bottom layer indicates that the integrity check of the RRC message in step 2 fails, the UE does not initiate the RRC connection re-establishment process because the UE judges that it is in the ongoing conditional switching process.
  • the bottom layer indicating that the integrity check of the RRC message failed may also be described as receiving an indication that the integrity check of the RRC message failed from the bottom layer.
  • condition switching in progress may be expressed as the saved condition switching configuration is being executed, or the RRC message/configuration being executed includes condition switching indication/information, or the T304 for condition switching is running.
  • Fig. 6 is a brief structural block diagram of a user equipment UE involved in the present disclosure.
  • the user equipment UE600 includes a processor 601 and a memory 602.
  • the processor 601 may include, for example, a microprocessor, a microcontroller, an embedded processor, and the like.
  • the memory 602 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 602 stores program instructions. When the instruction is executed by the processor 601, it can execute the above-mentioned method executed by the user equipment described in detail in this disclosure.
  • 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 a user's mobile terminal, 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 method shown above is 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 can 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 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.
  • the present disclosure is not limited to the above-mentioned embodiment. 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 conditioning, office equipment, vending machines, and other household appliances.

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Abstract

本公开提供一种由用户设备执行的条件切换方法以及对应的用户设备。由用户设备执行的条件切换方法，包括如下步骤：条件切换监测步骤，用户设备UE接收来自源基站的包含条件切换命令的无线资源控制RRC消息，保存所述条件切换命令中的条件切换配置，并根据切换条件监测所述切换条件是否满足；条件切换执行步骤，在当UE监测到所保存的条件切换配置中的切换条件满足时，发起条件切换；RRC消息接收步骤，正在执行条件切换的UE接收来自源基站的RRC消息；条件切换停止步骤，UE停止正在进行的条件切换过程；执行RRC配置步骤，UE根据正在进行的条件切换过程中接收到的RRC消息中的配置来执行相对应的配置。

Description

条件切换方法及对应的用户设备 技术领域
本公开涉及无线通信技术领域，更具体地，本公开涉及条件切换方法以及对应的用户设备。
背景技术
2018年6月，在第三代合作伙伴计划(3rd Generation Partnership Project：3GPP)RAN#80次全会上批准了一个5G技术标准的新的研究项目(参见非专利文献：RP-181433：New WID on NR(New Radio)mobility enhancements)。此外，另有一个Release 16的新研究项目(参见非专利文献：RP-190272：WID for Even further Mobility enhancement in E-UTRAN(Evolved-Universal Terrestrail Radio Access Network))。这两个项目的研究目的之一是找到用于满足网络中的移动性需要之一：无缝切换，即在小区切换过程中能够满足0毫秒或接近0毫秒的切换中断时间，并增强切换的鲁棒性。在正在研究的降低切换中断时间和/或增强切换鲁棒性的解决方案中，有一种解决方法称为基于条件的切换(Conditional HandOver，CHO)。在CHO机制中，基站提前下发切换命令给UE，其中切换命令中包含条件配置信息。UE在所配置的条件满足时再根据之前收到的切换命令来执行切换。这样通过切换命令的提前下发可以提高切换命令接收的成功率，从而提高切换成功率，避免因切换命令接收失败而带来的切换失败对业务中断带来的时延。
本公开针对在NR系统和LTE(Long Term Evolution)系统中实现CHO的一些问题提出解决方法。
发明内容
本公开实施例的目的在于针对在NR系统和LTE系统中实现CHO技术的问题提出解决方法。更具体地，本公开针对UE如何处理在执行条件切换的过程中接收到来自源小区的RRC消息的问题提出了解决方法。本公开实施例提供了由用户设备执行的条件切换方法以及相应的用户设备。
根据本公开的第一方面，提出了一种由用户设备执行的条件切换方法，包括如下步骤：条件切换监测步骤，用户设备UE接收来自源基站的包含条件切换命令的无线资源控制RRC消息，保存所述条件切换命令中的条件切换配置，并根据切换条件监测所述切换条件是否满足；条件切换执行步骤，在当UE监测到所保存的条件切换配置中的切换条件满足时，发起条件切换；RRC消息接收步骤，正在执行条件切换的UE接收来自源基站的RRC消息；条件切换停止步骤，UE停止正在进行的条件切换过程；执行RRC配置步骤，UE根据正在进行的条件切换过程中接收到的RRC消息中的配置来执行相对应的配置。
在上述的由用户设备执行的条件切换方法中，优选的是，正在执行条件切换的UE接收到的来自源基站的RRC消息包含如下情况：情况1：所述RRC消息包含切换命令；情况2：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了释放UE当前正在进行的切换过程的目标小区的指示信息；情况3：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了与UE当前正在进行的切换过程的目标小区相关的修改信息；情况4：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了用于指示UE释放所保存的条件切换命令配置的信息；情况5：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了与UE当前正在进行的切换过程的目标小区不相关或不相同的其他条件切换备选小区的配置信息；情况6：所述RRC消息包含了不用于切换和条件切换的配置信息。
在上述的由用户设备执行的条件切换方法中，优选的是，在执行 所述条件切换停止步骤之后执行所述执行RRC配置步骤，或者，在执行所述执行RRC配置步骤之后执行所述条件切换停止步骤。
在上述的由用户设备执行的条件切换方法中，优选的是，在情况3时，在执行所述RRC消息接收步骤之后执行所述执行RRC配置步骤，包括：UE挂起当前正在进行的条件切换过程；确定所接收到的RRC消息中的条件切换配置中对正在进行的条件切换所关联的目标小区相关联的重配置的切换条件是否仍满足。
在上述的由用户设备执行的条件切换方法中，优选的是，当确定出所接收到的RRC消息中的条件切换配置中对正在进行的条件切换所关联的目标小区相关联的重配置的切换条件仍满足时，UE继续当前正在进行的条件切换，否则，UE执行所述条件切换停止步骤来停止正在进行的条件切换过程。
在上述的由用户设备执行的条件切换方法中，优选的是，在所述条件切换停止步骤中，UE执行下述操作的一个或多个来停止正在进行的条件切换过程：操作1：停止定时器或者认为定时器超时；操作2：停止正在进行的随机接入过程；操作3：取消所述条件切换执行步骤中RRC重配置完成消息的发送；操作4：释放目标小区所关联的RRC实体；操作5：生成一个失败报告信息，并将所述失败报告信息包含在向源基站发送的响应消息中或向目标基站发送的响应消息中；操作6：认为所述条件切换过程结束。
根据本公开的第二方面，提出了一种由用户设备执行的条件切换方法，包括如下步骤：条件切换监测步骤，用户设备UE接收来自源基站的包含条件切换命令的无线资源控制RRC消息，保存所述条件切换命令中的条件切换配置，并根据切换条件监测所述切换条件是否满足；条件切换执行步骤，在当UE监测到所保存的条件切换配置中的切换条件满足时，发起条件切换；RRC消息接收步骤，正在执行条件切换的UE接收来自源基站的RRC消息；条件切换继续执行步骤，UE不应用或不执行正在进行的条件切换过程中接收到的RRC消息以继续正在进行的条件切换过程。
在上述的由用户设备执行的条件切换方法中，优选的是，在所述条件切换继续执行步骤中，UE执行下述方法的一个或多个不应用或 不执行正在进行的条件切换过程中接收到的RRC消息以继续正在进行的条件切换过程：RRC层当收到来自源基站的RRC消息时，忽略或丢弃所收到的RRC消息；当媒体接入控制MAC层收到一个逻辑信道标识指示MAC协议数据单元PDU或服务数据单元SDU是对应于专用控制信道DCCH时，MAC层丢弃该MAC PDU或MAC SDU。
在上述的由用户设备执行的条件切换方法中，优选的是，所述条件切换配置和所述切换条件是目标小区所关联的。
根据本公开的第三方面，提出了一种用户设备，包括：处理器；以及存储器，所述存储器上存储有指令；所述指令在由所述处理器运行时，使所述用户设备执行上文所描述的条件切换方法。
根据本公开所涉及的由用户设备执行的条件切换方法以及相应的用户设备，能够在UE已经发起了接入到目标基站的条件切换过程但又收到了来自源基站的RRC配置消息的情况下，避免不正确的切换或切换失败而带来的时延和信令开销，优化系统的移动性能。换言之，可以在移动切换过程中尽可能满足“0ms”的数据中断时延，并提高切换的鲁棒性以达到NR中的无缝切换的移动性需求。
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LTE/NR系统中的一般切换过程的流程图。
图2是本公开的实施例1涉及的由用户设备UE执行的条件切换方法的示意图。
图3是本公开的实施例1涉及的由用户设备UE执行的条件切换方法的流程图。
图4是本公开的实施例2涉及的由用户设备UE执行的条件切换方法的示意图。
图5是本公开的实施例2涉及的由用户设备UE执行的条件切换方法的流程图。
图6是本公开涉及的用户设备UE的简要结构框图。
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E-UTRAN或演进的通用陆地无线接入(Evolved Universal Terrestrial Radio Access，E-UTRA)来替换。在本公开中，源小区也可称为源基站，也可以是源光束(beam)、源传输点(Transmission point，TRP)，目标小区也可称为目标基站，也可以是目标光束、目标传输点。源小区指的是切换过程发起之前所连接的为UE服务的基站即向UE发送包含切换命令的RRC消息的基站。目标小区指的是切换过程成功完成之后UE所连接的为UE服务的基站，或者 说是切换命令中所包含的目标小区标识所指示的小区。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。在LTE系统中是包含移动控制信息(MobilityControlInformation)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包含目标基站的配置信息，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。条件切换命令和条件切换配置可替换。监测(monitor)和检测(detect)可替换。
在本申请中，UE在收到包含切换命令的无线资源控制(Radio Resource Control，RRC)消息之后，在发起切换过程之前仍然保持和源基站的通信包括数据传输，以进一步减小数据传输中断的时间。
首先简要介绍LTE/NR系统中的一般切换过程。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变更服务小区的过程。流程参见图1，简述如下：
阶段1：测量阶段。基站向用户设备(User Equipment，UE)下发测量配置；UE基于该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。测量阶段不是必须的，在基站在没有有效测量报告的时候也可以盲切换UE。
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决定是否为该UE触发切换。若确定对该UE触发切换， 则源基站通过向目标基站发送切换请求消息来发起切换准备过程。目标基站根据切换请求消息中UE的上下文和目标基站的可用资源等因素决定是否接受对该UE的本次切换请求，如果可以，则向源基站回复切换确认消息，其中切换确认消息中包含一条基站间(inter-node)的RRC消息即切换命令。
阶段3：切换执行阶段。源基站将切换命令下发给UE，并开始将该UE的数据转发给目标基站。收到切换命令的UE立即应用该切换命令的配置执行切换，通过随机接入过程接入到目标基站，向目标基站发送确认消息。其中，随机接入过程不是必须的。
阶段4：切换完成阶段。目标基站确认UE成功接入后，向源基站发送切换完成消息。源基站据此可以释放其上所保存的UE上下文。
从上可见，当前系统中的切换流程会引发数据传输的中断，Release 14版本的LTE系统中，对于切换流程的优化如无随机接入过程的切换，断开前仍连接(Make Before Break，MBB)等都旨在降低切换过程中的数据中断时间。
其次简述基于条件的切换。如前所述在Release 16技术需求中，要求在移动切换过程中尽可能满足“0ms”的数据中断时延，并提高切换的鲁棒性以达到NR中的无缝切换的移动性需求。在当前的切换过程中，一种导致切换失败而造成较长时间数据传输中断的原因是切换命令下发的不及时导致的切换命令接收失败。对于该问题，一种可行的方法是基于条件的切换(简称之条件切换)。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，提前将切换命令下发给UE，其中携带切换执行的条件。不同于LTE现有切换机制，UE收到切换命令后，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条件监测源小区的链路质量或目标小区的链路质量。只有当监测到所配置的切换条件满足时，UE才开始执行所保存的切换命令，接入到目标小区。针对上述 切换机制，本公开中称之条件切换，但并不限制其命名，也可以称提前切换命令的切换机制、预先切换、早切换准备等。
3GPP RAN2工作组会议上对条件切换达成了一个结论：在UE发起条件切换后在向目标基站成功发送RRC重配置完成消息之前，由源小区来维护UE的RRC连接。换言之，UE在向目标基站成功发送RRC重配置完成消息之前依然维持和源基站的RRC连接。在条件切换中，何时发起切换执行阶段是由UE确定的，为UE服务的源基站无法及时获知，这就可能出现UE已经发起了接入到目标基站的条件切换过程但又收到了来自源基站的RRC配置消息的情况。本公开就对这种情况下UE如何操作的问题提出下述实施方法，使得UE能够在这种情况下处理接收到的RRC消息，从而避免不正确的切换或切换失败而带来的时延和信令开销，优化系统的移动性能。上述UE有正在进行的条件切换过程时(即从发起条件切换过程到成功发送RRC重配置完成消息给目标基站之前，此时T304处于运行状态)收到来自源基站的RRC配置消息包含但不限于下述几种情况：
情况1：所述RRC消息包含切换命令。所述切换命令为传统切换命令，即不是用于条件切换的切换命令。
情况2：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了释放UE当前正在进行的切换过程的目标小区的指示信息。换言之，UE当前正在执行的条件切换过程的目标小区和所述RRC消息中条件切换配置中指示要释放的条件切换备选小区是同一个；或UE当前正在执行的条件切换过程的目标小区是所述RRC消息中条件切换配置中指示要释放的多个条件切换备选小区中的一个。
情况3：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了与UE当前正在进行的切换过程的目标小区相关的修改信息，如所关联的条件的重配置信息。换言之，所述RRC消息包含了UE当前正在执行的条件切换过程的目标小区相关配置的重配置信息。
情况4：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了用于去使能条件切换或者说用于指示UE释放所保存的条件切换命令配置的信息。
情况5：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了与UE当前正在进行的切换过程的目标小区不相关或不相同的其他条件切换备选小区的配置信息。换言之，所述RRC消息是用于配置或修改其他条件切换备选小区的配置信息。
情况6：所述RRC消息包含了不用于切换和条件切换的配置信息。比如所述RRC消息不是RRC重配置信息，或所述RRC消息是不包含同步重配置信息元素或移动性控制信息信息元素的RRC重配置信息。也就是说，所述RRC消息不用于切换，比如是用于配置辅小区的添加修改等。
所述条件切换备选小区是指UE所接收到用于配置条件切换的RRC消息中的条件切换命令或条件切换配置中的(目标)小区。网络侧可以同时为UE配置一个或多个切换条件备选小区。
下述是本公开中基于上述问题在UE上执行的若干实施例。
实施例1
在该实施例中，当正在执行条件切换的UE接收到了来自源基站的RRC消息时，UE停止正在进行的条件切换过程，应用或执行所述接收到的RRC消息。其中，正在执行条件切换也可以描述为发起了条件切换。下面，利用图2以及图3来描述该过程。
步骤S301：发起条件切换(条件切换执行步骤)。
所述发起条件切换在当UE监测到所保存的条件切换配置中的切换条件满足时发起的。所述条件切换配置和所述切换条件是目标小区所关联的。优选地，所述发起条件切换的操作包含下述一个或多个：启动定时器T304；执行目标小区所对应的条件切换配置中的目标小区RRC配置；执行目标小区所对应的同步重配置信息元素中的配置；下行同步到目标小区；向目标小区执行随机接入；生成RRC重配置完成 消息并递交给下层发送。
在一种实施方式中，UE在切换过程中会对源小区和目标小区同时维护两套接入层协议栈(用户面协议栈或控制面协议栈)。此时，所述发起条件切换的操作还包括为目标小区建立相关联的L1/L2实体或RRC实体。所述L2实体包含服务数据适应协议(Service Data Adaptation Protocol，SDAP)实体或包数据汇聚协议(Packet Data Covergence Protocol，PDCP)实体或无线链路控制(Radio Link Control，RLC)实体或媒体接入控制(Medium Access Control，MAC)实体。所述UE发起条件切换的操作中的一种或多种在目标小区所关联的RRC实体中执行，如生成RRC重配置完成消息并递交给下层发送的操作在目标小区所关联的RRC实体中执行，向目标小区执行随机接入是在目标小区所关联的MAC实体中执行。
步骤S302：正在执行条件切换的UE接收来自源基站的RRC消息(RRC消息接收步骤)。
所述RRC消息包含前述6种情况。
步骤S303：UE执行下述操作的一个或多个来停止正在进行的条件切换过程(条件切换停止步骤)。
操作1：停止定时器T304或者认为T304超时。
操作2：停止正在进行的随机接入过程。可选地，所述停止正在进行的随机接入过程通过重置或释放MAC实体来实现。优选地，所述MAC实体是目标小区所关联的MAC实体。
操作3：取消步骤S301中所述RRC重配置完成消息的发送。优选地，所述取消RRC重配置完成消息的发送通过重建或释放SRB1所对应的L2实体来实现。所述L2实体是PDCP实体或无线链路控制RLC实体。优选地，所述L2实体是目标小区所关联的L2实体，或者在步骤S301中所建立的目标小区所关联的L2实体。
操作4：释放目标小区所关联的RRC实体。所述RRC实体为步骤S301中所建立的与目标小区所关联的RRC实体。
操作5：生成一个失败报告信息，并将所述失败报告信息包含在 向源基站发送的响应消息中(比如在情况2～6时)或向目标基站发送的响应消息中(比如在情况1时)。所述失败报告信息中包含UE有正在进行的条件切换过程的指示信息或UE当前有效的测量结果等。所述UE有正在进行的条件切换过程的指示信息包含指示UE在接收到上述步骤S302中的RRC消息时(是否)有发起的或正在进行的条件切换过程或UE在接收到上述步骤S302中的RRC消息时发起的或正在进行的条件切换过程所关联的目标小区信息(所接入的目标小区标识或频率)。
操作6：认为所述条件切换过程结束。
步骤S304：UE根据步骤S302中收到的RRC消息中的配置执行相对应的配置(执行RRC配置步骤)。可选地，还包括向源小区发送一个响应消息，来响应步骤S302中收到的RRC消息。
步骤S303和步骤S304的执行顺序并不限定。例如，可以在执行步骤S303之后执行步骤S304，或者，也可以在执行步骤S304之后执行步骤S303。
可选地，在情况3时在执行步骤S302后执行步骤S304，包括，UE挂起当前正在进行的条件切换过程；确定所接收到的RRC消息中的条件切换配置中对正在进行的条件切换所关联的目标小区相关联的重配置的切换条件是否仍满足。如果是，则UE继续当前正在进行的条件切换；若否，则UE执行步骤S303来停止正在进行的条件切换过程。所述UE挂起当前正在进行的条件切换过程指的是暂停切换过程的相关操作。
显然地，该实施例在步骤S301之前还包括：步骤S300，UE接收来自源基站的包含条件切换命令的RRC消息，保存所述条件切换命令中的条件切换配置，并根据切换条件监测所述切换条件是否满足(条件切换监测步骤)。所述条件切换配置指UE根据所述条件切换命令中的配置而生成的RRC配置，可选地，所述切换配置指UE根据所述切换命令中的配置以及当前UE的RRC配置而生成的RRC配置。所述切换条件，即UE只有在所述条件满足时才执行切换，应用所述切换 配置，所述切换条件包含在条件切换命令中。举例来说，切换条件是一个测量事件，比如所述条件是测量事件A3(在持续一段时间内邻小区比服务小区信号质量超过一个偏移量)。所述邻小区对应切换的目标小区。一般来说，目前3GPP标准规范定义的所有测量事件(参见36.331和38.331中5.5.4章节)，如A1～A5，都可作为切换条件包含在条件切换命令中。
实施例2
在该实施例中，当正在执行条件切换的UE接收到了来自源基站的RRC消息时，UE继续正在进行的条件切换过程，不应用或不执行所述接收到的RRC消息。其中，正在执行条件切换也可以描述为发起了条件切换或用于条件切换的定时器T304正在运行。下面，利用图4以及图5来描述该过程。
步骤S501：发起条件切换(条件切换执行步骤)。
所述发起条件切换在当UE监测到所保存的条件切换配置中的切换条件满足时发起的。所述条件切换配置和所述切换条件是目标小区所关联的。优选地，所述发起条件切换的操作包含下述一个或多个：启动定时器T304；执行目标小区所对应的条件切换配置中的目标小区RRC配置；执行目标小区所对应的同步重配置信息元素中的配置；下行同步到目标小区；向目标小区执行随机接入；生成RRC重配置完成消息并递交给下层发送。
在一种实施方式中，UE在切换过程中会对源小区和目标小区同时维护两套接入层协议栈(用户面协议栈或控制面协议栈)。此时，所述发起条件切换的操作还包括为目标小区建立相关联的L1/L2实体或RRC实体。所述L2实体包含服务数据适应协议(Service Data Adaptation Protocol，SDAP)实体或包数据汇聚协议(Packet Data Covergence Protocol，PDCP)实体或无线链路控制(Radio Link Control，RLC)实体或媒体接入控制(Medium Access Control，MAC)实体。所述UE发起条件切换的操作中的一种或多种在目标小区所关联的 RRC实体中执行，如生成RRC重配置完成消息并递交给下层发送的操作在目标小区所关联的RRC实体中执行，向目标小区执行随机接入是在目标小区所关联的MAC实体中执行。
步骤S502：正在执行条件切换的UE接收来自源基站的RRC消息(RRC消息接收步骤)。
所述RRC消息包含前述6种情况。
步骤S503：UE执行下述方法的一个或多个不应用或不执行所述正在进行的条件切换过程中接收到的RRC消息以继续正在进行的条件切换过程(条件切换继续执行步骤)。
在一种实现方法中，UE RRC层当收到来自源基站的RRC消息时，忽略或丢弃所收到的RRC消息。可选地，在UE同时维护对源基站和目标基站的RRC实体时，所述RRC层是源基站所关联的RRC层/实体。
在另一种实现方法中，在MAC层执行。当MAC层收到一个逻辑信道标识指示所述MAC协议数据单元(Packet Data Unit，PDU)或服务数据单元(Service Data Unit，SDU)是对应于专用控制信道(Dedicated Control CHannal，DCCH)时，MAC层丢弃该MAC PDU或MAC SDU，即不向上层递交所述数据包。在这种方式中，MAC层在发起对目标小区的随机接入过程后或者在发起条件切换后，丢弃或不向上层递交SRB1上收到的数据包。优选地，所述MAC层/实体是源基站所关联的MAC层/实体。所述MAC实体对当前正在进行条件切换的信息从RRC层获知或在双协议栈时从目标小区关联的MAC实体获知。换句话说，在条件切换发起后，由RRC层或目标小区关联的MAC实体向源小区关联的MAC实体发送一个指示，告知条件切换正在进行或已发起。
显然地，该实施例在步骤S501之前还包括：步骤S500，UE接收来自源基站的包含条件切换命令的RRC消息，保存所述条件切换命令中的条件切换配置，并根据切换条件监测所述切换条件是否满足(条件切换监测步骤)。所述条件切换配置指UE根据所述条件切换命令中 的配置而生成的RRC配置，可选地，所述切换配置指UE根据所述切换命令中的配置以及当前UE的RRC配置而生成的RRC配置。所述切换条件，即UE只有在所述条件满足时才执行切换，应用所述切换配置。举例来说，切换条件是一个测量事件，比如所述条件是测量事件A3(在持续一段时间内邻小区比服务小区信号质量超过一个偏移量)。所述邻小区对应切换的目标小区。
实施例3
该实施例中UE在发起条件切换之后不再处理来自源小区或将要发送到源小区的RRC消息，与实施例2类似。在UE上执行。也就是说在条件切换过程中(用于条件切换的定时器T304正在运行)，不再处理来自源小区或将要发送到源小区的RRC消息。
步骤1：发起条件切换。
发起条件切换的操作和过程与前述实施例相同，此处不赘述。
步骤2：挂起(suspend)信令无线承载1(Signalling Radio Bearer 1，SRB1)。可选地，还包括重建所述SRB1对应的PDCP或RLC。这里的RRC指源小区所关联的RRC，PDCP或RLC指源小区所关联的PDCP或RLC。
步骤3：在用于接入目标小区的随机接入过程完成后或者在该过程中生成并发送给目标小区的RRC重配置完成消息的发送成功后，恢复SRB1。所述恢复SRB1还包括认为所述SRB1是连接到目标小区的。在另一种实现方式中，在用于接入目标小区的随机接入过程完成后或者在该过程中生成并发送给目标小区的RRC重配置完成消息的发送成功后，释放源基站所关联的SRB1及其相关联的RRC实体或L2实体。
实施例4
该实施例给出了一种条件切换RRC过程结束的方法。使得在条件切换的RRC过程结束前，UE即使收到来自源基站的RRC消息也 不对其进行处理，从而不会中断正在进行的条件切换过程。该实施例也可应用于使用在切换过程中同时和源小区和目标小区通信的切换机制的切换过程(该过程不是条件切换过程，在本公开中可以称为增强的断开前保持连接(enhanced Make Before Break，eMBB)机制或同时连接切换机制或双连接切换机制或非分离承载切换机制。)
步骤1：发起切换过程。该切换过程可以是条件切换过程或eMBB切换过程。
发起条件切换的操作和过程与前述实施例相同，此处不赘述。
发起eMBB的切换过程的操作与发起条件切换的操作相似。
在该步骤中，包括生成RRC重配置完成消息并通过SRB1递送给下层发送。RRC重配置完成消息的发送使用新配置(即在对应切换命令中包含的目标小区对应的配置)。
步骤2：当下层确认了RRC重配置完成消息的发送(成功)时，结束所述RRC过程即执行切换命令RRC消息的切换过程，停止T304定时器。所述当下层确认了RRC重配置完成消息的发送成功时也可表述为当收到了从下层发来的RRC重配置完成消息已发送(成功)的指示时。
结合现有机制以及3GPP标准协议的内容，该实施例可按下面来表述。
步骤1：当接收到RRC重配置消息时，应用RRC重配置消息中的配置。
在条件切换的情况下，因为包含条件切换命令的RRC重配置消息不是立即应用的，而是提前接收到并保存在UE上的，所以所述当接收到RRC重配置消息时指的是切换条件满足发起条件切换时。
所述应用RRC重配置消息中的配置包括生成RRC重配置完成消息并通过SRB1递送给下层发送。RRC重配置完成消息的发送使用新配置(即在对应RRC重配置消息中包含的配置)。可选地，还包括前述发起条件切换的操作。
步骤2：若同步重配置(reconfigurationwithsync)信息元素包含 在特殊小区配置(spcellconfig)信息元素中且该过程是条件切换或eMBB切换过程，当下层确认了RRC重配置完成消息的发送(成功)时，结束所述RRC过程即执行切换命令RRC消息的切换过程，停止定时器T304。所述当下层确认了RRC重配置完成消息的发送(成功)时也可表述为当收到了从下层发来的RRC重配置完成消息已发送(成功)的指示时。否则(若同步重配置信息元素包含在特殊小区配置信息元素中且该过程不是条件切换或eMBB切换过程)，当MAC成功完成了由该RRC过程中步骤1中触发的一个随机接入过程时，结束所述RRC过程，停止定时器T304。
上述“若同步重配置信息元素包含在特殊小区配置信息元素中”对应于NR系统。在LTE系统中等同于是“当移动控制信息元素(mobilitycontrolInfo)包含在RRC重配置消息中或若在配置了无随机接入(rach-skip)时MAC指示成功收到了以UE专用标识(如小区无线网络临时标识C-RNTI)的一个物理下行控制信道时”。其中，所述特殊小区配置信息元素包含主小区组的特殊小区(主小区PCell)或辅小区组的特殊小区(主辅小区PSCell)的配置参数。
实施例5
该实施例区别于实施例1的地方在于，UE在正在进行的条件切换过程中(用于条件切换的T304正在运行)收到来自源小区的RRC消息时，通过判断源小区的链路情况来决定是停止或继续所述条件切换过程。
步骤1：与实施例1步骤S301相同。
步骤2：与实施例1步骤S302相同。
步骤3：判断源小区链路是否满足条件。若不满足，则停止正在进行的条件切换过程，即执行实施例1中的步骤S303和步骤S304；若满足，则继续正在进行的条件切换过程，不执行/丢弃所述步骤2中收到的RRC消息。
在一个实施方式中，所述是否满足条件指定时器T310或T312是 否运行。T310或T312正在运行则满足条件；T310或T312不在运行则不满足条件。所述T310或T312用于无线链路失败的监测，可参见3GPP协议规范文档36.331或38.331。
在另一种实施方式中，所述是否满足条件指信道质量测量值如参考信号接收功率RSRP低过一个门限值。信道质量测量值低过一个门限值，则认为满足条件；信道质量测量值高于一个门限值，则认为不满足条件。
实施例6
该实施例区别于实施例1的地方在于，UE在正在进行的条件切换过程中(用于条件切换的T304正在运行)收到来自源小区的RRC消息时，通过判断目标小区的链路情况来决定是停止或继续所述条件切换过程。
步骤1：与实施例1步骤S301相同。
步骤2：与实施例1步骤S302相同。
步骤3：判断目标小区链路是否满足条件。若不满足，则继续正在进行的条件切换过程，不执行/丢弃所述步骤2中收到的RRC消息。若满足，则停止正在进行的条件切换过程，即执行实施例1中的步骤S303和步骤S304。
在一个实施方式中，所述是否满足条件指定时器T310或T312是否运行。T310或T312正在运行则满足条件；T310或T312不在运行则不满足条件。所述T310或T312用于无线链路失败的监测，可参见3GPP协议规范文档36.331或38.331。
在另一种实施方式中，所述是否满足条件指信道质量测量值如参考信号接收功率RSRP高过一个门限值。信道质量测量值高过一个门限值，则认为不满足条件；信道质量测量值低于一个门限值，则认为满足条件。
实施例7
该实施例提供了一种UE在正在进行的条件切换过程中(用于条件切换的T304正在运行)接收到来自源小区的RRC消息且所述RRC消息完整性校验失败的处理方法。
步骤1：与实施例1步骤S301相同。
步骤2：与实施例1步骤S302相同。
步骤3：若底层指示步骤2中所述RRC消息的完整性校验失败，则因为UE判断其处于正在进行的条件切换过程中，所以UE不发起RRC连接重建立过程。
所述底层指示所述RRC消息的完整性校验失败还可描述为收到来自底层的所述RRC消息的完整性校验失败的指示。
上述各实施例中所述与SRB1相关联的内容，同样也适用于SRB2。所述处于正在进行的条件切换中可表述为正在执行所保存的条件切换配置，或者正在执行的RRC消息/配置中包含了条件切换指示/信息，或用于条件切换的T304正在运行。
本公开中，一些不同实施例之间可以协同工作。
图6是本公开涉及的用户设备UE的简要结构框图。如图6所示，该用户设备UE600包括处理器601和存储器602。处理器601例如可以包括微处理器、微控制器、嵌入式处理器等。存储器602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602上存储有程序指令。该指令在由处理器601运行时，可以执行本公开详细描述的由用户设备执行的上述方法。
在本公开中，“基站”是指具有较大发射功率和较广覆盖面积的移动通信数据和控制交换中心，包括资源分配调度、数据接收发送等功能。“用户设备”是指用户移动终端，例如包括移动电话、笔记本等可以与基站或者微基站进行无线通信的终端设备。
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 (10)

  1. 一种由用户设备执行的条件切换方法，包括如下步骤：
    条件切换监测步骤，用户设备UE接收来自源基站的包含条件切换命令的无线资源控制RRC消息，保存所述条件切换命令中的条件切换配置，并根据切换条件监测所述切换条件是否满足；
    条件切换执行步骤，在当UE监测到所保存的条件切换配置中的切换条件满足时，发起条件切换；
    RRC消息接收步骤，正在执行条件切换的UE接收来自源基站的RRC消息；
    条件切换停止步骤，UE停止正在进行的条件切换过程；
    执行RRC配置步骤，UE根据正在进行的条件切换过程中接收到的RRC消息中的配置来执行相对应的配置。
  2. 根据权利要求1所述的由用户设备执行的条件切换方法，其中，
    正在执行条件切换的UE接收到的来自源基站的RRC消息包含如下情况：
    情况1：所述RRC消息包含切换命令；
    情况2：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了释放UE当前正在进行的切换过程的目标小区的指示信息；
    情况3：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了与UE当前正在进行的切换过程的目标小区相关的修改信息；
    情况4：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了用于指示UE释放所保存的条件切换命令配置的信息；
    情况5：所述RRC消息包含用于条件切换的配置信息，且所述用于条件切换的配置信息中包含了与UE当前正在进行的切换过程的目标小区不相关或不相同的其他条件切换备选小区的配置信息；
    情况6：所述RRC消息包含了不用于切换和条件切换的配置信息。
  3. 根据权利要求2所述的由用户设备执行的条件切换方法，其中，
    在执行所述条件切换停止步骤之后执行所述执行RRC配置步骤，或者，在执行所述执行RRC配置步骤之后执行所述条件切换停止步骤。
  4. 根据权利要求3所述的由用户设备执行的条件切换方法，其中，
    在情况3时，在执行所述RRC消息接收步骤之后执行所述执行RRC配置步骤，包括：
    UE挂起当前正在进行的条件切换过程；
    确定所接收到的RRC消息中的条件切换配置中对正在进行的条件切换所关联的目标小区相关联的重配置的切换条件是否仍满足。
  5. 根据权利要求4所述的由用户设备执行的条件切换方法，其中，
    当确定出所接收到的RRC消息中的条件切换配置中对正在进行的条件切换所关联的目标小区相关联的重配置的切换条件仍满足时，UE继续当前正在进行的条件切换，否则，UE执行所述条件切换停止步骤来停止正在进行的条件切换过程。
  6. 根据权利要求1或2所述的由用户设备执行的条件切换方法，其中，
    在所述条件切换停止步骤中，UE执行下述操作的一个或多个来停止正在进行的条件切换过程：
    操作1：停止定时器或者认为定时器超时；
    操作2：停止正在进行的随机接入过程；
    操作3：取消所述条件切换执行步骤中RRC重配置完成消息的发送；
    操作4：释放目标小区所关联的RRC实体；
    操作5：生成一个失败报告信息，并将所述失败报告信息包含在向源基站发送的响应消息中或向目标基站发送的响应消息中；
    操作6：认为所述条件切换过程结束。
  7. 一种由用户设备执行的条件切换方法，包括如下步骤：
    条件切换监测步骤，用户设备UE接收来自源基站的包含条件切换命令的无线资源控制RRC消息，保存所述条件切换命令中的条件切换配置，并根据切换条件监测所述切换条件是否满足；
    条件切换执行步骤，在当UE监测到所保存的条件切换配置中的切换条件满足时，发起条件切换；
    RRC消息接收步骤，正在执行条件切换的UE接收来自源基站的RRC消息；
    条件切换继续执行步骤，UE不应用或不执行正在进行的条件切换过程中接收到的RRC消息以继续正在进行的条件切换过程。
  8. 根据权利要求7所述的由用户设备执行的条件切换方法，其中，
    在所述条件切换继续执行步骤中，UE执行下述方法的一个或多个不应用或不执行正在进行的条件切换过程中接收到的RRC消息以继续正在进行的条件切换过程：
    RRC层当收到来自源基站的RRC消息时，忽略或丢弃所收到的RRC消息；
    当媒体接入控制MAC层收到一个逻辑信道标识指示MAC协议数据单元PDU或服务数据单元SDU是对应于专用控制信道DCCH时，MAC层丢弃该MAC PDU或MAC SDU。
  9. 根据权利要求1或7所述的由用户设备执行的条件切换方法，其中，
    所述条件切换配置和所述切换条件是目标小区所关联的。
  10. 一种用户设备，包括：
    处理器；以及
    存储器，所述存储器上存储有指令；
    所述指令在由所述处理器运行时，使所述用户设备执行根据权利要求1-9中任意一项所述的方法。
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