WO2020042863A1 - 由用户设备执行的方法、用户设备以及切换命令生成方法 - Google Patents

由用户设备执行的方法、用户设备以及切换命令生成方法 Download PDF

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Publication number
WO2020042863A1
WO2020042863A1 PCT/CN2019/098851 CN2019098851W WO2020042863A1 WO 2020042863 A1 WO2020042863 A1 WO 2020042863A1 CN 2019098851 W CN2019098851 W CN 2019098851W WO 2020042863 A1 WO2020042863 A1 WO 2020042863A1
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Prior art keywords
handover
configuration
condition
base station
command
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English (en)
French (fr)
Inventor
常宁娟
刘仁茂
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Sharp Corp
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Sharp Corp
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Priority to US17/270,608 priority Critical patent/US11678238B2/en
Priority to AU2019333410A priority patent/AU2019333410B2/en
Priority to EP19855127.7A priority patent/EP3846536B1/en
Publication of WO2020042863A1 publication Critical patent/WO2020042863A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H04W36/0038—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of security context information
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H04W36/362—Conditional handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • 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
    • H04W36/00838—Resource reservation for handover

Definitions

  • the present disclosure relates to the field of wireless communication technologies, and more particularly, the present disclosure relates to a method performed by a user equipment, a user equipment, and a handover command generation method.
  • 3GPP 3rd Generation Partnership Project
  • RAN # 80 plenary meeting see Non-Patent Document: RP-181433: New WIDon NR (New Radio) mobility enhancements.
  • One of the research goals of this project is to find one of the requirements for meeting the mobility requirements in NR: seamless handover, that is, to meet the 0 millisecond handover interruption time during cell handover.
  • one solution under study to reduce the handover interruption time one solution is called Conditional Handover (CHO).
  • the base station issues a handover command to the UE in advance and configures the UE to perform handover according to the previously received handover command when certain conditions are met. In this way, the success rate of handover command reception can be improved by issuing the handover command in advance. Therefore, the delay caused by the switching failure due to the failure of receiving the switching command to the service interruption is avoided.
  • the present disclosure proposes solutions to some problems of implementing CHO in an NR system.
  • the present disclosure provides a method performed by a user equipment, a user equipment, and a handover command generation handover method, which can solve a problem of implementing a CHO technology in an NR system. More specifically, the present disclosure proposes a solution to the problems such as how the UE manages the received CHO command and the validity judgment of the CHO command saved by the UE in the NR system.
  • a method performed by a user equipment UE including: receiving a handover command including a handover condition, and saving a handover configuration in the handover command, where the handover condition is used when the When the handover condition is satisfied, the user equipment executes a handover configuration corresponding to the handover condition; and when a failure of the primary cell group MCG is detected or a security update is required, at least operations related to the saved handover configuration are performed.
  • a handover is performed based on the saved handover configuration to access the target cell.
  • the saved handover configuration is discarded.
  • a method performed by a user equipment including: receiving a first handover command including a first handover condition; saving a first handover configuration in the first handover command; A first handover configuration validity timer corresponding to the first handover configuration, wherein the first handover condition is configured to be executed by the user equipment when the first handover condition is satisfied; The first handover configuration, the first handover configuration validity timer is used to specify a validity period of the first handover configuration; and when receiving the instruction information from the network side, stopping or stopping according to the instruction information Restarting the first handover configuration validity timer.
  • the first handover configuration validity timer is stopped.
  • a handover command generation method for generating a handover command including a handover condition for handover from a source base station to a target base station, wherein the handover condition is used when the handover condition is satisfied
  • the handover command generating method includes: sending, from the source base station to the target base station, a handover preparation information radio resource control RRC message containing the handover condition; the target base station is receiving After receiving the handover preparation information RRC message, in the case of deciding to accept the handover, the handover condition is included in a handover command RRC message and sent to the source base station; and the source base station will receive the received The handover command with the handover condition is sent to the user equipment.
  • a user equipment including: a processor; and a memory storing instructions, wherein the instructions execute any one of the methods performed by the user equipment when run by the processor. .
  • a solution to a problem of generating and managing a handover command in a system supporting conditional handover is provided, so that the UE can determine the handover command To avoid service interruption caused by the connection failure caused by the UE performing a handover according to an invalid handover command.
  • FIG. 1 is a schematic timing diagram showing a general handover procedure in an LTE / NR system.
  • FIG. 2 is a flowchart illustrating a method performed by a user equipment according to the present disclosure.
  • FIG. 3 is a flowchart illustrating another method performed by a user equipment according to the present disclosure.
  • FIG. 4 is a flowchart illustrating a handover command generation method according to the present disclosure.
  • FIG. 5 is a block diagram illustrating a user equipment according to the present disclosure.
  • LTE Long Term Evolution
  • NR New Radio
  • LTE can be replaced with each other in this disclosure; the LTE system is also used to refer to 5G and later LTE systems (such as the eLTE system, or an LTE system that can be connected to the 5G core network) At the same time, LTE can be replaced by Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN) or Evolved Universal Terrestrial Radio Access (Evolved Universal Terrestrial Radio Access, E-UTRA).
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • a source cell may also be referred to as a source base station, may also be a source beam, a source transmission point (TRP), and a target cell may also be referred to as a target base station, or a target beam, and a target transmission. point.
  • the source cell refers to the base station that served the UE before the handover process was performed or the cell that served the UE or the UE camped on before the cell reselection occurred.
  • the target cell refers to the base station that serves the UE after the handover process is performed, or a handover command. The cell indicated in; or the cell serving the UE or the UE camping on after the cell reselection occurs.
  • the UE after receiving a Radio Resource Control (RRC) message containing a handover command, the UE still maintains communication with the source base station, including data transmission, before performing the handover, to further reduce data transmission interruptions. time.
  • RRC Radio Resource Control
  • Phase 1 The base station sends a measurement configuration to the user equipment (UE); the UE measures the wireless link corresponding to the serving cell based on the measurement configuration. When the configured reporting conditions are met, the UE sends a measurement report to the base station. The base station determines whether the UE needs to be switched in combination with the received measurement report and other factors such as the load of the base station.
  • UE user equipment
  • Phase 2 If a handover is decided, the source base station triggers the handover preparation process and sends a handover request message to the target base station; the target base station decides whether to accept the UE according to factors such as the context of the UE in the handover request message and the available resources of the target base station. A handover confirmation message is fed back to the source base station, where the handover confirmation message includes a handover command.
  • Phase 3 The source base station sends a handover command to the UE and starts data forwarding to the target base station. After receiving the handover command, the UE immediately executes the handover command and accesses the target base station, such as accessing the target base station through a random access process.
  • Phase 4 After the target base station confirms that the UE has successfully accessed, it sends a handover completion message to the source base station.
  • condition-based switching In the 5G NR technology requirements, it is required to meet the "0ms" data interruption delay as much as possible during the mobile handover process, in order to meet the mobility requirements of seamless handover in NR.
  • a reason for a long-term data transmission interruption that causes a handover failure is the failure to receive the handover command caused by the delay in issuing the handover command.
  • conditional switching a feasible method is condition-based switching (referred to as conditional switching).
  • conditional handover set a relatively conservative measurement report threshold so that the base station obtains the measurement results in advance, and performs the handover preparation process based on the measurement results and the selected target base station, so that the base station can advance the handover command before the real handover conditions are met. It is delivered to the UE, which carries the conditions for handover execution. Unlike the existing LTE handover mechanism, the UE does not perform handover immediately after receiving the handover command. Instead, it performs detection based on the handover conditions carried in the handover command message. Only when the configured handover conditions are met, the UE starts to perform handover. Command to access the target cell.
  • the handover command is used to trigger the UE to perform a mobile-side control change, that is, handover, and generally refers to an RRC reconfiguration message including a Reconfiguration with sync information element or a Mobility Control Information information element.
  • the synchronous reconfiguration information element or the mobile control information information element includes configuration information of the target base station, and is used to configure mobility information such as the configuration information of the target base station to the UE in the network-controlled mobility, which is usually included in the primary cell.
  • the handover generally refers to network-side or UE-controlled handover, cell change, serving cell change, primary cell change, primary and secondary cell change, intra-cell handover for security update, synchronous reconfiguration, etc. in the RRC connected state.
  • the present disclosure proposes the following implementation method for the generation and management of a switching command in a system that supports conditional switching.
  • the switching command, the switching configuration in the switching command, and the switching corresponding to the switching configuration can be effectively performed.
  • a validity timer is configured for management, so that the UE can determine the validity of the handover command, and avoid service interruption caused by the connection failure caused by the UE performing the handover according to the invalid handover command.
  • FIG. 2 is a flowchart illustrating a method performed by a user equipment according to the present disclosure. As shown in FIG. 2, the method includes steps S201 and S203.
  • step S201 a handover command including a handover condition is received, and the handover configuration in the handover command is saved, where the handover condition is used by the user equipment to perform a handover configuration corresponding to the handover condition when the handover condition is satisfied.
  • step S203 if it is detected that the MCG fails or a security update is required, at least operations related to the saved handover configuration are performed.
  • a management scheme for a handover configuration in a handover command including a handover condition is proposed.
  • at least operations related to the saved handover configuration are performed, such as In the case of detecting the MCG failure, the RRC connection re-establishment process is performed and the saved handover configuration is discarded, or the handover is performed based on the saved handover configuration to access the target cell, so that the Manage the switch configuration in the switch command.
  • FIG. 3 is a flowchart illustrating another method performed by a user equipment according to the present disclosure. As shown in FIG. 3, the method includes steps S301 and S303.
  • step S301 a first switching command including a first switching condition is received, a first switching configuration in the first switching command is saved, and a corresponding first switching configuration validity timer is started, where the first switching condition is used for When the first handover condition is satisfied, the user equipment executes the corresponding first handover configuration, and the first handover configuration validity timer is used to specify a valid period of the first handover configuration.
  • step S303 if the instruction information is received from the network side, the first handover configuration validity timer is stopped or restarted according to the instruction information.
  • a management scheme for a handover configuration validity timer corresponding to a handover configuration in a handover command including a handover condition is proposed.
  • the handover configuration validity timer is used to specify a valid period of the handover configuration.
  • the validity period is defined as the operation period of the timer.
  • the handover configuration validity timer is stopped, thereby effectively managing the handover configuration validity timer corresponding to the handover configuration in the handover command including the handover condition, and enabling the user
  • the device can determine the validity of the handover command and avoid service interruption caused by the connection failure caused by performing the handover based on the invalid handover command.
  • FIG. 4 is a flowchart illustrating a handover command generation method according to the present disclosure. As shown in FIG. 4, the method includes steps S401, S403, and S405.
  • step S401 a handover preparation information RRC message including a handover condition is sent from the source base station to the target base station.
  • step S403 after receiving the handover preparation information RRC message, when the target base station decides to accept the handover, the target base station sends the handover condition to the source base station in a handover command RRC message.
  • step S405 the source base station sends the received handover command including the handover condition to the user equipment.
  • a management scheme for generating a handover command including a handover condition is proposed.
  • the target base station When the target base station generates a handover command, it includes a handover condition received in advance from the source base station to generate a conditional handover command.
  • the required switching command including the switching condition is flexibly generated, so that the generation of the switching command including the switching condition can be effectively managed.
  • This embodiment proposes a method for managing a handover configuration when a master cell group (MCG) fails, which is performed on a UE and includes:
  • Step 1 The UE triggers the RRC connection re-establishment process
  • Step 2 If there is a saved handover configuration on the UE, discard / release the saved handover configuration.
  • the RRC connection re-establishment process is used to reestablish an RRC connection in the event of MCG failure.
  • the occurrence of the MCG failure may be the detection of a MCG wireless link failure, that is, poor link quality, MCG synchronization reconfiguration failure, receipt of a signaling radio bearer (SRB) or data radio bearer (Data) from the bottom layer.
  • Radio Bearer (DRB) related integrity check failure indication RRC connection reconfiguration failure, mobility failure from NR / LTE (i.e. mobility between different radio access technology systems where the source base station belongs to the NR / LTE system Failed) etc.
  • the method further includes: the UE receives a handover command including the first condition from the base station, and saves the handover configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command and the current RRC configuration of the UE.
  • the first condition refers to a handover condition, that is, the UE performs a handover only when the first condition is satisfied, and applies the handover configuration generated based on the handover command.
  • the first condition may be a measurement event.
  • the first condition may be that the signal quality of the neighbor cell over the serving cell exceeds a threshold value for a period of time.
  • the neighboring cell corresponds to a handover target cell.
  • the releasing / discarding the saved handover configuration may also be described as a view that the saved handover configuration is invalid.
  • the MCG refers to a serving cell group including a primary cell and zero or more (including one) secondary cells corresponding to the primary base station when dual connectivity is configured, and refers to all serving cells of the UE when dual connectivity is not configured, Contains the primary cell.
  • step 2 further includes stopping the corresponding handover configuration validity timer.
  • the handover configuration validity timer refers to the UE side managing the received and saved handover configuration based on the timer. In short, when the timer runs, the UE considers the received or stored handover configuration to be valid; When the controller is not running, such as when it times out or stops, the UE considers that the received or stored handover configuration is invalid, or the UE releases / clears / discards the received or stored handover configuration information.
  • the handover configuration validity timer is configured by the base station through an RRC message, such as a first RRC message containing a handover command, and the validity timer configuration includes a timer value.
  • the configuration of the validity timer may be configured by the source cell or by the target cell.
  • the validity timer and / or its configuration may distinguish each handover command or each target cell, or the validity The performance timer distinguishes between handover commands or target cells, and its value is a common value common to all handover commands or target cells.
  • This embodiment proposes a method for managing handover configuration when MCG fails, which is performed on the UE and includes:
  • Step 1 The UE triggers the RRC connection re-establishment process, and sends an RRC re-establishment request message to the base station;
  • Step 2 The UE receives a response message in response to the RRC re-establishment request message, such as an RRC re-establishment message;
  • Step 3 If there is a saved handover configuration on the UE, the saved handover configuration is discarded / released.
  • the RRC connection re-establishment process is used to reestablish an RRC connection in the event of MCG failure.
  • the occurrence of the MCG failure may be the detection of a wireless link failure of the MCG, that is, the link quality is poor, the synchronization reconfiguration failure of the MCG fails, an indication of the failure of the integrity check related to the SRB or DRB received from the bottom layer, or the RRC connection reconfiguration failure , Mobility failure from NR / LTE (that is, mobility failure between different radio access technology systems of the system to which the source base station belongs is NR / LTE system), and so on.
  • the method further includes: the UE receives a handover command including the first condition from the base station, and saves the handover configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command and the current RRC configuration of the UE.
  • the first condition refers to a handover condition, that is, the UE performs a handover only when the first condition is satisfied, and applies the handover configuration generated based on the handover command.
  • the first condition may be a measurement event.
  • the first condition may be that the signal quality of the neighboring cell exceeds the threshold value of the serving cell for a period of time.
  • the neighboring cell corresponds to a handover target cell.
  • the releasing / discarding the saved handover configuration may also be described as a view that the saved handover configuration is invalid.
  • step 3 further includes stopping the corresponding handover configuration validity timer.
  • the handover configuration validity timer refers to the UE side managing the received and saved handover configuration based on the timer. In short, when the timer runs, the UE considers the received or stored handover configuration to be valid; When the controller is not running, such as when it times out or stops, the UE considers that the received or stored handover configuration is invalid, or the UE releases / clears / discards the received or stored handover configuration information.
  • the handover configuration validity timer is configured by the base station through an RRC message, such as a first RRC message containing a handover command, and the validity timer configuration includes a timer value.
  • the configuration of the validity timer may be configured by the source cell or by the target cell.
  • the validity timer and / or its configuration may distinguish each handover command or each target cell, or the validity The performance timer distinguishes between handover commands or target cells, and its value is a common value common to all handover commands or target cells.
  • This embodiment proposes another method for managing handover configuration when MCG fails, which is performed on the UE and includes:
  • Step 1 UE detects MCG failure
  • Step 2 If there is a saved handover configuration on the UE, the UE performs handover based on the saved handover configuration and accesses the target cell.
  • the detection of the MCG failure may be the detection of a MCG wireless link failure, that is, poor link quality, MCG synchronization reconfiguration failure, receipt of an integrity check failure indication related to the SRB or DRB from the bottom layer, and RRC connection reconfiguration Failure, mobility failure from NR / LTE (that is, mobility failure between different radio access technology systems of the system to which the source base station belongs is NR / LTE system), etc.
  • the method further includes: the UE receives a handover command including the first condition from the base station, and saves the handover configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command and the current RRC configuration of the UE.
  • the first condition refers to a handover condition, that is, the UE performs a handover only when the first condition is satisfied, and applies the handover configuration generated based on the handover command.
  • the first condition may be a measurement event.
  • the first condition may be that the signal quality of the neighboring cell exceeds the threshold value of the serving cell for a period of time.
  • the neighboring cell corresponds to a handover target cell.
  • this embodiment different from the traditional system where the UE initiates an RRC connection re-establishment process to re-establish the RRC connection when an MCG failure occurs, the UE uses the handover configuration saved on it to access the target base station, so that the UE can Resume connection to the network faster, thereby reducing service interruption delays.
  • this embodiment is also applicable to a scenario in which multiple handover configurations for multiple handover target cells are saved on the UE.
  • the UE determines a target cell to perform handover. For example, the UE may select a target cell with the best link quality for handover based on the downlink quality of the target cell.
  • This embodiment proposes another method for managing handover configuration when MCG fails, which is performed on the UE and includes:
  • Step 1 The UE initiates the MCG failure information process
  • Step 2 If there is a saved handover configuration on the UE, discard / release the saved handover configuration.
  • the MCG failure information process is initiated when the UE detects the MCG failure, and is used to report the MCG failure to the base station.
  • the UE initiates the MCG failure information process when the MCG failure is detected and the MCG transmission is not suspended, and reports the MCG failure information to the base station, such as the cause of the MCG failure.
  • the detection of the MCG failure may be the detection of a MCG wireless link failure, that is, poor link quality, MCG synchronization reconfiguration failure, receipt of an integrity check failure indication related to the SRB or DRB from the bottom layer, and RRC connection reconfiguration Failure, mobility failure from NR / LTE (that is, mobility failure between different radio access technology systems of the system to which the source base station belongs is NR / LTE system), etc.
  • the method further includes: the UE receives a handover command including the first condition from the base station, and saves the handover configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command and the current RRC configuration of the UE.
  • the first condition refers to a handover condition, that is, the UE performs a handover only when the first condition is satisfied, and applies the handover configuration generated based on the handover command.
  • the first condition may be a measurement event.
  • the first condition may be that the signal quality of the neighboring cell exceeds the threshold value of the serving cell for a period of time.
  • the neighboring cell corresponds to a handover target cell.
  • the releasing / discarding the saved handover configuration may also be described as a view that the saved handover configuration is invalid.
  • step 2 further includes stopping the corresponding handover configuration validity timer.
  • the handover configuration validity timer refers to the UE side managing the received and saved handover configuration based on the timer. In short, when the timer runs, the UE considers the received or stored handover configuration to be valid; When the controller is not running, such as when it times out or stops, the UE considers that the received or stored handover configuration is invalid, or the UE releases / clears / discards the received or stored handover configuration information.
  • the handover configuration validity timer is configured by the base station through an RRC message, such as a first RRC message containing a handover command, and the validity timer configuration includes a timer value.
  • the configuration of the validity timer may be configured by the source cell or by the target cell.
  • the validity timer and / or its configuration may distinguish each handover command or each target cell, or the validity The performance timer distinguishes between handover commands or target cells, and its value is a common value common to all handover commands or target cells.
  • This embodiment proposes a method for managing a handover configuration during a security update, which is performed on a UE and includes:
  • Step 1 The UE triggers a security update process or the UE receives an RRC message from the base station containing a security update indication;
  • Step 2 If there is a saved handover configuration on the UE, discard / release the saved handover configuration.
  • the security update process is used to update a security context on the UE, such as a security algorithm, a security key, and the like, and may also be referred to as a security key update process.
  • the security update indication is a keyrefresh information element contained in a radio bearer configuration information element in the RRC message.
  • the method further includes: the UE receives a handover command including the first condition from the base station, and saves the handover configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command and the current RRC configuration of the UE.
  • the first condition refers to a handover condition, that is, the UE performs a handover only when the first condition is satisfied, and applies the handover configuration generated based on the handover command.
  • the first condition may be a measurement event.
  • the first condition may be that the signal quality of the neighboring cell exceeds the threshold value of the serving cell for a period of time.
  • the neighboring cell corresponds to a handover target cell.
  • step 2 further includes stopping the corresponding handover configuration validity timer.
  • the handover configuration validity timer refers to the UE side managing the received and saved handover configuration based on the timer. In short, when the timer runs, the UE considers the received or stored handover configuration to be valid; When the controller is not running, such as when it times out or stops, the UE considers that the received or stored handover configuration is invalid, or the UE releases / clears / discards the received or stored handover configuration information.
  • the handover configuration validity timer is configured by the base station through an RRC message, such as a first RRC message containing a handover command, and the validity timer configuration includes a timer value.
  • the configuration of the validity timer may be configured by the source cell or by the target cell.
  • the validity timer and / or its configuration may distinguish each handover command or each target cell, or the validity The performance timer distinguishes between handover commands or target cells, and its value is a common value common to all handover commands or target cells.
  • This embodiment proposes a method for managing a handover configuration validity timer, which is executed on a UE and includes:
  • Step 1 The UE receives a first handover command including a first condition from a base station; the first handover command is a handover command for a first target cell.
  • Step 2 The UE receives another second handover command including the first condition from the base station, and the second handover command is a handover command for the first target cell.
  • Step 3 The UE stops configuring a validity timer for the handover of the first target cell.
  • the timer is a timer associated with the first switching command.
  • Step 1 further includes: the UE receives a handover command including the first condition from the base station, saves the handover configuration in the handover command, and starts a corresponding handover configuration validity timer.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command and the current RRC configuration of the UE.
  • the first condition refers to a handover condition, that is, the UE performs a handover only when the first condition is satisfied, and applies the handover configuration generated based on the handover command.
  • the first condition may be a measurement event.
  • the first condition may be that the signal quality of the neighboring cell is greater than a threshold value over the serving cell for a period of time.
  • the neighboring cell corresponds to a handover target cell.
  • the first conditions in steps 1 and 2 may be the same or different.
  • the handover configuration validity timer refers to the UE side managing the received and saved handover configuration based on the timer. In short, when the timer runs, the UE considers the received or stored handover configuration to be valid; When the controller is not running, such as when it times out or stops, the UE considers that the received or stored handover configuration is invalid, or the UE releases / clears / discards the received or stored handover configuration information.
  • the handover configuration validity timer is configured by the base station through an RRC message, such as a first RRC message containing a handover command, and the validity timer configuration includes a timer value.
  • the configuration of the validity timer may be configured by the source cell or by the target cell.
  • the validity timer and / or its configuration may distinguish each handover command or each target cell, or the validity The performance timer distinguishes between handover commands or target cells, and its value is a common value common to all handover commands or target cells.
  • step 3 is described as: restarting the handover configuration validity timer for the first target cell.
  • This embodiment provides a condition-based handover configuration validity timer management method, which is executed on a UE and includes:
  • Step 1 Receive an RRC message from the base station containing the second condition.
  • Step 2 When the second condition is satisfied, the UE or UE RRC stops handover configuration validity timer.
  • the second condition is configured by the base station through an RRC message.
  • the RRC message may be a system message or a dedicated RRC message, such as RRC connection reconfiguration, and may further be a handover command RRC message including the first condition.
  • the second condition may be configured by the target cell or configured by the source cell.
  • the second condition may be any combination of one or more of the following events, but is not limited to the following events:
  • Event 1 The measured value of the signal quality of the serving cell is greater than a threshold value
  • Event 2 The measurement value of the signal quality of the neighboring cell is less than a threshold value
  • Event 3 The signal quality measurement value of the serving cell is greater than a threshold value of the signal quality measurement value of the neighboring cell;
  • Event 4 The serving cell signal quality measurement value is greater than one threshold value and the neighboring cell signal quality measurement value is less than another threshold value.
  • the neighboring cell in the above event refers to the corresponding target cell in the handover command.
  • the serving cell and the target cell in the above events may be different radio access technologies (Radio Access Technology, RAT).
  • the configuration of the second condition or event may be a configuration based on a measurement event in LTE. For example, when the second condition is configured as event 3, where the threshold value is configured as th, and the trigger time (TimeToTrigger, TTT) value is configured as duration, the UE detects the signal quality of the source cell and the target cell. When the difference between the quality measurement value and the signal quality measurement value of the neighboring cell is greater than or equal to th, and the duration time continues, the UE considers that the second condition is satisfied.
  • TTT TimeToTrigger
  • the handover configuration validity timer refers to the UE side managing the received and saved handover configuration based on the timer. In short, when the timer runs, the UE considers the received or stored handover configuration to be valid; When the controller is not running, such as when it times out or stops, the UE considers that the received or stored handover configuration is invalid, or the UE releases / clears / discards the received or stored handover configuration information.
  • the handover configuration validity timer is configured by the base station through an RRC message. For example, if the handover command includes a first condition, the configuration of the validity timer includes a timer value.
  • the configuration of the validity timer may be configured by the source cell or by the target cell.
  • the validity timer and / or its configuration may distinguish each handover command or each target cell, or the validity The performance timer distinguishes between handover commands or target cells, and its value is a common value common to all handover commands or target cells.
  • the method further includes: the UE receives a handover command including the first condition from the base station, saves the handover configuration in the handover command, and starts a corresponding handover configuration validity timer.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command and the current RRC configuration of the UE.
  • the first condition refers to a handover condition, that is, the UE performs a handover only when the first condition is satisfied, and applies the handover configuration generated based on the handover command.
  • the first condition may be a measurement event.
  • the first condition may be that the signal quality of the neighboring cell exceeds the threshold value of the serving cell for a period of time.
  • the neighboring cell corresponds to a handover target cell.
  • This embodiment is also applicable to a scenario that supports multiple handover commands or multiple handover destination cells.
  • the foregoing operations in this embodiment are performed by distinguishing between a handover command or a handover target cell.
  • the configuration of the second condition may be configured for each handover target cell, or may be shared by all handover target cells.
  • the UE operation in this embodiment when the second condition corresponding to one handover target cell is satisfied , The UE performs only the corresponding operation in step 2 on the handover configuration corresponding to the corresponding handover target cell.
  • This embodiment proposes a method for managing a handover configuration validity timer, which is executed on a UE and includes:
  • Step 1 The UE performs a handover.
  • Step 2 The UE stops the handover configuration validity timer.
  • the UE performing the handover in step 1 may be a UE performing a conditional handover based on the saved handover configuration, or may be a traditional handover, that is, the UE immediately performs a handover after receiving a handover command that does not include a first condition. If the UE performs a conditional handover in step 1, before step 1, the method further includes: the UE receives a handover command including the first condition from the base station, saves the handover configuration in the handover command, and starts a corresponding handover configuration validity timer. .
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command.
  • the handover configuration refers to an RRC configuration generated by the UE according to the configuration in the handover command and the current RRC configuration of the UE.
  • the first condition refers to a handover condition, that is, the UE performs a handover only when the first condition is satisfied, and applies the handover configuration generated based on the handover command.
  • the first condition may be a measurement event.
  • the first condition may be that the signal quality of the neighbor cell over the serving cell exceeds a threshold value for a period of time.
  • the neighboring cell corresponds to a handover target cell.
  • the handover configuration validity timer refers to the UE side managing the received and saved handover configuration based on the timer. In short, when the timer runs, the UE considers the received or stored handover configuration to be valid; When the controller is not running, such as when it times out or stops, the UE considers that the received or stored handover configuration is invalid, or the UE releases / clears / discards the received or stored handover configuration information.
  • the handover configuration validity timer is configured by the base station through an RRC message, such as a first RRC message containing a handover command, and the validity timer configuration includes a timer value.
  • the configuration of the validity timer may be configured by the source cell or by the target cell.
  • the validity timer and / or its configuration may distinguish each handover command or each target cell, or the validity The performance timer distinguishes between handover commands or target cells, and its value is a common value common to all handover commands or target cells.
  • the handover configuration validity timer in step 2 refers to a handover configuration validity timer other than a handover configuration validity timer corresponding to a target cell where the UE is currently performing handover.
  • the handover configuration validity timer described in step 2 may be a handover configuration validity timer corresponding to a target cell in the handover configuration saved by all UEs.
  • Performing the handover described in step 1 can also be described as applying an RRC configuration including a handover command.
  • the handover command issued to the UE is generated by the target base station and is delivered to the UE through the source base station.
  • the source base station does not modify the handover command.
  • the handover decision is determined by the source base station.
  • the first condition for the conditional handover should preferably be configured by the source base station, but how to include the first condition configured by the source base station in a handover command that cannot be modified by the source base station becomes a problem. The following embodiment proposes a method for this problem.
  • This embodiment proposes a method for generating a conditional handover command, which is executed on a source base station and a target base station for handover.
  • Step 1 The source base station initiates a handover preparation process, and sends a handover preparation information (HandoverPreparationInformation) RRC message including the first condition to the target base station.
  • the first condition may indicate that the target base station is performing a conditional handover this time.
  • the first condition refers to a handover condition, that is, the UE performs a handover only when the first condition is satisfied, and applies the handover configuration generated based on the handover command.
  • the first condition may be a measurement event.
  • the first condition may be that the signal quality of the neighboring cell exceeds the threshold value of the serving cell for a period of time.
  • the neighboring cell corresponds to a handover target cell.
  • Step 2 After receiving the RRC message including the first condition handover preparation information sent by the source base station, the target base station sends a handover including the first condition to the source base station if the target base station decides to accept the handover of the UE.
  • Command RRC message That is, the target base station sends the first condition received in step 1 to the source base station in the handover command RRC message generated by it.
  • Step 3 The source base station sends the received handover command including the first condition to the UE.
  • the RRC message including the first condition handover preparation information in step 1 is included in the XnAP handover request message, and the handover command RRC message including the first condition described in step 2 is included in the XnAP handover response message.
  • Xn is the interface between the source base station and the target base station in the NR system, and in the LTE system, it corresponds to the X2 interface.
  • This embodiment proposes a method for generating a conditional handover command, which corresponds to Embodiment 9 and is executed on a source base station for handover.
  • Step 1 The source base station initiates a handover preparation process, and sends a handover preparation information (HandoverPreparationInformation) RRC message including the first condition to the target base station.
  • the first condition may indicate that the target base station is performing a conditional handover this time.
  • the first condition refers to a handover condition, that is, the UE performs a handover only when the first condition is satisfied, and applies the handover configuration generated based on the handover command.
  • the first condition may be a measurement event.
  • the first condition may be that the signal quality of the neighboring cell exceeds the threshold value of the serving cell for a period of time.
  • the neighboring cell corresponds to a handover target cell.
  • Step 2 Receive an X2AP or XnAP message including a handover command RRC message from the target base station, where the handover command RRC message includes a first condition for the conditional handover.
  • Step 3 Send a handover command RRC message including the first condition to the UE.
  • the RRC message including the first condition handover preparation information in step 1 is included in the XnAP handover request message, and the handover command RRC message including the first condition described in step 2 is included in the XnAP handover response message.
  • Xn is the interface between the source base station and the target base station in the NR system, and in the LTE system, it corresponds to the X2 interface.
  • This embodiment proposes a method for generating a conditional handover command, which corresponds to Embodiment 9 and is executed on a target base station for handover.
  • Step 1 Receive the handover preparation information (HandoverPreparationInformation) RRC message sent by the source base station.
  • the first condition may indicate that the target base station is performing a conditional handover this time.
  • the first condition refers to a handover condition, that is, the UE performs a handover only when the first condition is satisfied, and applies the handover configuration generated based on the handover command.
  • the first condition may be a measurement event.
  • the first condition may be that the signal quality of the neighboring cell exceeds the threshold value of the serving cell for a period of time.
  • the neighboring cell corresponds to a handover target cell.
  • Step 2 After receiving the handover preparation information RRC message including the first condition sent by the source base station, if the target base station decides to accept the current handover of the UE, send a handover command RRC message including the first condition to the source base station. That is, the target base station sends the first condition received in step 1 to the source base station in the handover command RRC message generated by it.
  • the RRC message including the first condition handover preparation information in step 1 is included in the XnAP handover request message, and the handover command RRC message including the first condition described in step 2 is included in the XnAP handover response message.
  • Xn is the interface between the source base station and the target base station in the NR system, and in the LTE system, it corresponds to the X2 interface.
  • base station refers to mobile communication data and control switching centers with larger transmission power and wider coverage area, including functions such as resource allocation scheduling, data receiving and sending.
  • User equipment refers to a user's mobile terminal, such as a terminal device that can communicate wirelessly with a base station or a micro base station, such as a mobile phone or a notebook.
  • the method and related equipment of the present disclosure have been described above in connection with the preferred embodiments. Those skilled in the art can understand that the method shown above is only exemplary. The methods of the present disclosure are not limited to the steps and sequences 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 and can be used for the base station, MME, or UE, and so on.
  • the various identifications shown above are exemplary only and not limiting, and the present disclosure is not limited to specific cells as examples of these identifications. Those skilled in the art can make many variations and modifications based on the teachings of the illustrated embodiments.
  • FIG. 5 shows a block diagram of a user equipment UE50 according to an embodiment of the present disclosure.
  • the UE 50 includes a processor 510 and a memory 520.
  • the processor 510 may include, for example, a microprocessor, a microcontroller, an embedded processor, and the like.
  • the memory 520 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a nonvolatile memory (such as a flash memory), or other memories.
  • the memory 520 stores program instructions. When executed by the processor 510, the instruction may execute the foregoing method in the user equipment described in detail in the present disclosure.
  • the program running on the device may be a program that causes a computer to realize the functions of the embodiments of the present disclosure by controlling a central processing unit (CPU).
  • the program or information processed by the program may be temporarily stored in volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory systems.
  • a program for implementing the functions of the embodiments of the present disclosure may be recorded on a computer-readable recording medium.
  • Corresponding functions can be realized by causing a computer system to read programs recorded on the recording medium and execute the programs.
  • the so-called “computer system” herein may be a computer system embedded in the device, and may include an operating system or hardware (such as a peripheral device).
  • the "computer-readable recording medium” may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium for a short-term dynamic storage program, or any other recording medium readable by a computer.
  • circuits designed to perform the functions described in this specification may include general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete Gate or transistor logic, discrete hardware components, or any combination of the above.
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • a general-purpose processor may be a microprocessor, or any existing processor, controller, microcontroller, or state machine.
  • the above circuit may be a digital circuit or an analog circuit. In the event that new integrated circuit technologies have replaced existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.
  • present disclosure is not limited to the above-described embodiments. Although various examples of the embodiments have been described, the present disclosure is not limited thereto.
  • Fixed or non-mobile electronic equipment installed indoors or outdoors can be used as terminal equipment or communication equipment, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

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Abstract

本公开提供了一种由用户设备执行的方法、用户设备以及切换命令生成方法。由用户设备执行的方法包括：接收包含切换条件的切换命令，保存所述切换命令中的切换配置，其中，所述切换条件用于当所述切换条件满足时由所述用户设备执行所述切换条件对应的切换配置；和在检测到主小区组MCG失败或者需要进行安全更新的情况下，至少执行与所保存的切换配置有关的操作。由此，使得用户设备能够确定切换命令的有效性，从而避免依据无效的切换命令执行切换所带来的连接失败而引起的业务中断。

Description

由用户设备执行的方法、用户设备以及切换命令生成方法 技术领域
本公开涉及无线通信技术领域，更具体地，本公开涉及由用户设备执行的方法、用户设备以及切换命令生成方法。
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)。该项目的研究目的之一是找到用于满足NR中的移动性需求之一：无缝切换，即在小区切换过程中能够满足0毫秒的切换中断时间。在正在研究的降低切换中断时间的解决方案中，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并配置UE在一定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系统中实现CHO的一些问题提出解决方法。
发明内容
为了解决上述问题中的至少一部分，本公开提供了一种由用户设备执行的方法、用户设备以及切换命令生成切换方法，能够解决NR系统中实现CHO技术的问题。更具体地，本公开针对在NR系统中UE如何管理所收到的CHO命令及UE所保存的CHO命令的有效性判断等问题提出了解决方法。
根据本公开的第一方面，提出了一种由用户设备UE执行的方法， 包括：接收包含切换条件的切换命令，保存所述切换命令中的切换配置，其中，所述切换条件用于当所述切换条件满足时由所述用户设备执行所述切换条件对应的切换配置；和在检测到主小区组MCG失败或者需要进行安全更新的情况下，至少执行与所保存的切换配置有关的操作。
在上述方法中，可以是，在检测到MCG失败的情况下，触发无线资源控制RRC连接重建立过程，并丢弃所保存的切换配置。
在上述方法中，可以是，在检测到MCG失败的情况下，基于所保存的切换配置执行切换，接入到目标小区。
在上述方法中，可以是，在检测到需要进行安全更新的情况下，丢弃所保存的切换配置。
根据本公开的第二方面，提出了一种由用户设备执行的方法，包括：接收包含第一切换条件的第一切换命令，保存所述第一切换命令中的第一切换配置，并启动与所述第一切换配置对应的第一切换配置有效性定时器，其中，所述第一切换条件用于当所述第一切换条件满足时由所述用户设备执行所述第一切换条件对应的所述第一切换配置，所述第一切换配置有效性定时器用于规定所述第一切换配置的有效期间；和在从网络侧接收到指示信息的情况下，根据所述指示信息来停止或重新启动所述第一切换配置有效性定时器。
在上述方法中，可以是，在作为所述指示信息而接收到包含第一切换条件的第二切换命令的情况下，若所述第二切换命令与所述第一切换命令对应同一个目标小区且关联同一个切换配置有效性定时器，则重新启动所述第一切换配置有效性定时器，否则停止所述第一切换配置有效性定时器。
在上述方法中，可以是，在作为所述指示信息而接收到包含停止条件的无线资源控制RRC消息的情况下，当所述停止条件满足时，停止所述第一切换配置有效性定时器。
在上述方法中，可以是，在作为所述指示信息而接收到不包含切换条件的切换命令的情况下、或者在所述第一切换条件满足的情况下，执行切换，并停止所述第一切换配置有效性定时器。
根据本公开的第三方面，提出了一种切换命令生成方法，用于生成从源基站向目标基站切换的包含切换条件的切换命令，其中，所述切换条件用于当所述切换条件满足时由用户设备执行所述切换条件对应的切换，所述切换命令生成方法包括：从所述源基站向所述目标基站发送包含切换条件的切换准备信息无线资源控制RRC消息；所述目标基站在接收到所述切换准备信息RRC消息后，在决定接纳本次切换的情况下，将所述切换条件包含在切换命令RRC消息中发送给所述源基站；和所述源基站将接收到的包含所述切换条件的切换命令发送给用户设备。
根据本公开的第四方面，提出了一种用户设备，包括：处理器；和存储器，存储有指令，其中，所述指令在由所述处理器运行时执行上述由用户设备执行的任一方法。
发明效果
根据本公开中的由用户设备执行的方法、用户设备以及切换命令生成切换方法，提供了在支持条件切换的系统中解决切换命令的生成以及管理的问题的方案，使得UE能够确定所述切换命令的有效性，避免UE依据无效的切换命令执行切换所带来的连接失败而引起的业务中断。
附图说明
通过下文结合附图的详细描述，本公开的上述和其它特征将会变得更加明显，其中：
图1是示出了LTE/NR系统中的一般切换过程的示意时序图。
图2是示出了根据本公开的由用户设备执行的方法的流程图。
图3是示出了根据本公开的由用户设备执行的另一方法的流程图。
图4是示出了根据本公开的切换命令生成方法的流程图。
图5是示出了本公开所涉及的用户设备的框图。
具体实施方式
下面结合附图和具体实施例对本公开进行详细描述。
在本公开中，术语“包括”和“含有”及其派生词意为包括而非限制；术语“或”是包含性的，意为和/或。
在本说明书中，下述用于描述本公开原理的各种实施例只是说明，不应该以任何方式解释为限制公开的范围。参照附图的下述描述用于帮助全面理解由权利要求及其等同物限定的本公开的示例性实施例。下述描述包括多种具体细节来帮助理解，但这些细节应认为仅仅是示例性的。因此，本领域普通技术人员应认识到，在不背离本公开的范围和精神的情况下，可以对本文中描述的实施例进行多种改变和修改。此外，为了清楚和简洁起见，省略了公知功能和结构的描述。此外，贯穿附图，相同参考数字用于相似功能和操作。
下文以长期演进系统(Long Term Evolution，LTE)/NR移动通信系统及其后续的演进版本作为示例应用环境，具体描述了根据本公开的多个实施方式。然而，需要指出的是，本公开不限于以下实施方式，而是可适用于更多其它的无线通信系统。若无特殊说明，在本公开中，小区和基站的概念可以互相替换；LTE系统也用于指代5G及其之后的LTE系统(如称为eLTE系统，或者可以连接到5G核心网的LTE系统)，同时LTE可以用演进的通用陆地无线接入网络(Evolved Universal Terrestrial Radio Access Network，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执行之前为UE服务的基站或者发生小区重选之前为UE服务或UE驻留的小区，目标小区指的是切换过程执行之后为UE服务的基站，或者说是切换命令中所指示的小区；或者发生小区重选之后为UE服务或UE驻留的小区。
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，在执行切换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。
首先简要介绍一下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。流程如图1所示，简述如下：
阶段1：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对应的无线链路进行测量，当满足所配置的上报条件时，UE向基站发送测量报告。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需要切换该UE。
阶段2：若决定切换，则源基站触发切换准备过程向目标基站发送切换请求消息；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纳该UE，如果可以，则向源基站反馈切换确认消息，其中切换确认消息中包含切换命令。
阶段3：源基站将切换命令下发给UE，并向目标基站开始数据转发。收到切换命令的UE立即执行切换命令，接入到目标基站，如通过随机接入过程接入到目标基站。
阶段4：目标基站确认UE成功接入后，向源基站发送切换完成消息。
从上可见，LTE系统中的切换流程会引发数据传输的中断，后续版本的LTE系统中，对于切换流程的优化如无随机接入过程的切换等都旨在降低切换时延及开销。
其次介绍一下基于条件的切换。在5G NR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，以达到NR中的无缝切换的移动性需求。在现有的切换过程中，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(简称为条件切换)。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执行切换准备流程，这样基站可以在真正的切换条件满足之前，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，而是根据切换命令消息中携带的切换条件进行检测，只有当所配置的切换条件满足时，UE才开始执行切换命令，接入到目标小区。所述切换命令用于触发UE 执行网络侧控制的移动变更即切换，一般指包含同步重配置(Reconfigurationwithsync)信息元素或移动控制信息(MobilityControlInformation)信息元素的RRC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，用于在网络侧控制的移动性中向UE配置移动性信息如目标基站的配置信息，通常包含在主小区配置(masterCellGroupConfig信息元素或对于主小区组的cellgroupconfig信息元素中)或辅小区组配置(secondaryCellGroupConfig信息元素或对于辅小区组的cellgroupconfig信息元素中)中。本公开中切换泛指RRC连接状态下网络侧控制或UE控制的切换、小区变更、服务小区变更、主小区变更、主辅小区变更、用于安全更新的小区内切换、同步重配置等。
本公开就在支持条件切换的系统中切换命令的生成以及管理问题提出下述实施方法，根据下述实施方法，能够有效地对切换命令、切换命令中的切换配置、以及切换配置所对应的切换配置有效性定时器进行管理，进而，使得UE能够确定所述切换命令的有效性，避免UE依据无效的切换命令执行切换所带来的连接失败而引起的业务中断。
图2是示出了根据本公开的由用户设备执行的方法的流程图。如图2所示，该方法包括步骤S201和步骤S203。
在步骤S201中，接收包含切换条件的切换命令，保存切换命令中的切换配置，其中，切换条件用于当该切换条件满足时由用户设备执行切换条件对应的切换配置。
在步骤S203中，在检测到MCG失败或者需要进行安全更新的情况下，至少执行与所保存的切换配置有关的操作。
根据上述方法，提出了一种关于包含切换条件的切换命令中的切换配置的管理方案，在检测到MCG失败或者需要进行安全更新的情况下，至少执行与所保存的切换配置有关的操作，例如，在检测到MCG失败的情况下，执行RRC连接重建立过程并丢弃所保存的切换配置，或者基于所保存的切换配置执行切换来接入到目标小区，由此 能够有效地对包含切换条件的切换命令中的切换配置进行管理。
图3是示出了根据本公开的由用户设备执行的另一方法的流程图。如图3所示，该方法包括步骤S301和步骤S303。
在步骤S301中，接收包含第一切换条件的第一切换命令，保存第一切换命令中的第一切换配置，并启动对应的第一切换配置有效性定时器，其中，第一切换条件用于当第一切换条件满足时由用户设备执行对应的第一切换配置，第一切换配置有效性定时器用于规定第一切换配置的有效期间。
在步骤S303中，在从网络侧接收到指示信息的情况下，根据指示信息来停止或重新启动第一切换配置有效性定时器。
根据上述方法，提出了一种关于包含切换条件的切换命令中的切换配置对应的切换配置有效性定时器的管理方案，切换配置有效性定时器用于规定切换配置的有效期间，例如将切换配置的有效期间规定为定时器的运行期间，在从网络侧接收到指示信息的情况下，根据指示信息来停止或重新启动切换配置有效性定时器，例如，在作为指示信息而接收到包含停止条件的RRC消息的情况下，当停止条件满足时，停止切换配置有效性定时器，由此能够有效地对包含切换条件的切换命令中的切换配置对应的切换配置有效性定时器进行管理，并且使得用户设备能够确定切换命令的有效性，避免依据无效的切换命令执行切换所带来的连接失败而引起的业务中断。
图4是示出了根据本公开的切换命令生成方法的流程图。如图4所示，该方法包括步骤S401、步骤S403和步骤S405。
在步骤S401中，从源基站向目标基站发送包含切换条件的切换准备信息RRC消息。
在步骤S403中，目标基站在接收到切换准备信息RRC消息后，在决定接纳本次切换的情况下，将切换条件包含在切换命令RRC消息中发送给源基站。
在步骤S405中，源基站将接收到的包含切换条件的切换命令发 送给用户设备。
根据上述方法，提出了一种关于生成包含切换条件的切换命令的管理方案，目标基站在生成切换命令时，将事先从源基站接收到的切换条件包含在内来生成条件切换命令，由此能够灵活地生成所需的包含切换条件的切换命令，从而能够有效地对包含切换条件的切换命令中的生成进行管理。
以下，详细描述本公开的若干实施例。
切换配置管理方法
实施例1
该实施例提出了一种在主小区组(Master Cell Group，MCG)失败时的切换配置的管理方法，在UE上执行，包括：
步骤1：UE触发RRC连接重建立过程；
步骤2：若UE上有所保存的切换配置，则丢弃/释放所保存的切换配置。
所述RRC连接重建立过程用于在发生MCG失败的情况下重建RRC连接。所述发生MCG失败可以是检测到MCG的无线链路失败即链路质量差、MCG的同步重配置失败、收到来自底层的信令无线承载(Signalling Radio Bearer，SRB)或数据无线承载(Data Radio Bearer，DRB)相关的完整性校验失败指示、RRC连接重配置失败、从NR/LTE的移动性失败(即源基站所属系统是NR/LTE系统的不同无线接入技术系统间的移动性失败)等。
在步骤1之前还包括：UE接收来自基站的包含第一条件的切换命令，并保存所述切换命令中的切换配置。所述切换配置指UE根据所述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。所述第一条件指的是切换条件，即UE只有在所述第一条件满足时，才执行切换，应用所述基于该切换命令生成的切换配置。举例来说，第一条件可以是一个测量事件，比如第一条件可以是在持 续一段时间内邻小区比服务小区信号质量超过一个门限值。所述邻小区对应切换的目标小区。
所述释放/丢弃所保存的切换配置也可以描述为认为所保存的切换配置无效。
所述MCG在配置了双连接时指主基站所对应的包含主小区和零个或一个以上(包含一个)辅小区在内的服务小区组，在未配置双连接时指UE的所有服务小区，包含主小区。
可选地，步骤2还包括停止相对应的切换配置有效性定时器。所述切换配置有效性定时器指UE侧基于该定时器管理所收到和保存的切换配置，简言之，当定时器运行时，UE认为所收到或所存储的切换配置有效；当定时器不运行时，如超时或停止时，UE认为所收到或所存储的切换配置无效，或UE释放/清除/丢弃所收到或所存储的切换配置信息。所述切换配置有效性定时器是由基站通过RRC消息配置的，如包含切换命令的第一RRC消息，所述有效性定时器的配置包含定时器的值。可选地，所述有效性定时器的配置可以是源小区配置的，也可以是目标小区配置的。可选地，在支持多个切换命令或多个切换目标小区的场景下，所述有效性定时器和/或其配置可以是区分每个切换命令或区分每个目标小区的，或者所述有效性定时器是区分切换命令的或区分目标小区的，而其值为一个所有切换命令或目标小区共用的公共值。
实施例2
该实施例提出了一种在MCG失败时的切换配置的管理方法，在UE上执行，包括：
步骤1：UE触发RRC连接重建立过程，向基站发送RRC重建立请求消息；
步骤2：UE接收用于响应RRC重建立请求消息的响应消息，如RRC重建立消息；
步骤3：若UE上有所保存的切换配置，则丢弃/释放所保存的切换配置。
所述RRC连接重建立过程用于在发生MCG失败的情况下重建RRC连接。所述发生MCG失败可以是检测到MCG的无线链路失败即链路质量差、MCG的同步重配置失败、收到来自底层的SRB或DRB相关的完整性校验失败指示、RRC连接重配置失败、从NR/LTE的移动性失败(即源基站所属系统是NR/LTE系统的不同无线接入技术系统间的移动性失败)等。
在步骤1之前还包括：UE接收来自基站的包含第一条件的切换命令，并保存所述切换命令中的切换配置。所述切换配置指UE根据所述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。所述第一条件指的是切换条件，即UE只有在所述第一条件满足时，才执行切换，应用所述基于该切换命令生成的切换配置。举例来说，第一条件可以是一个测量事件，比如第一条件可以是在持续一段时间内邻小区比服务小区信号质量超过一个门限值。所述邻小区对应切换的目标小区。
所述释放/丢弃所保存的切换配置也可以描述为认为所保存的切换配置无效。
可选地，步骤3还包括停止相对应的切换配置有效性定时器。所述切换配置有效性定时器指UE侧基于该定时器管理所收到和保存的切换配置，简言之，当定时器运行时，UE认为所收到或所存储的切换配置有效；当定时器不运行时，如超时或停止时，UE认为所收到或所存储的切换配置无效，或UE释放/清除/丢弃所收到或所存储的切换配置信息。所述切换配置有效性定时器是由基站通过RRC消息配置的，如包含切换命令的第一RRC消息，所述有效性定时器的配置包含定时器的值。可选地，所述有效性定时器的配置可以是源小区配置的，也可以是目标小区配置的。可选地，在支持多个切换命令或多个切换目标小区的场景下，所述有效性定时器和/或其配置可以是区分每个切换命令或区分每个目标小区的，或者所述有效性定时器是区分切换命令的或区分目标小区的，而其值为一个所有切换命令或目标小区共用的公共值。
实施例3
该实施例提出了另一种MCG失败时的切换配置的管理方法，在UE上执行，包括：
步骤1：UE检测到MCG失败；
步骤2：若UE上有所保存的切换配置，则UE基于所保存的切换配置执行切换，接入到目标小区。
所述检测到MCG失败可以是检测到MCG的无线链路失败即链路质量差、MCG的同步重配置失败、收到来自底层的SRB或DRB相关的完整性校验失败指示、RRC连接重配置失败、从NR/LTE的移动性失败(即源基站所属系统是NR/LTE系统的不同无线接入技术系统间的移动性失败)等。
在步骤1之前还包括：UE接收来自基站的包含第一条件的切换命令，并保存所述切换命令中的切换配置。所述切换配置指UE根据所述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。所述第一条件指的是切换条件，即UE只有在所述第一条件满足时，才执行切换，应用所述基于该切换命令生成的切换配置。举例来说，第一条件可以是一个测量事件，比如第一条件可以是在持续一段时间内邻小区比服务小区信号质量超过一个门限值。所述邻小区对应切换的目标小区。
在该实施例中，不同于传统系统中UE在发生MCG失败时发起RRC连接重建立过程来重建立RRC连接，而是UE利用其上保存的切换配置接入到目标基站中，这样使得UE能够更快地恢复与网络侧的连接，从而减少业务中断时延。可选地，该实施例同样适用于UE上保存了针对多个切换目标小区的多个切换配置的场景。在这种场景下，UE确定一个目标小区执行切换。如，UE可以基于目标小区的下行链路质量选择链路质量最好的目标小区进行切换。
实施例4
该实施例提出了另一种MCG失败时的切换配置的管理方法，在UE上执行，包括：
步骤1：UE发起MCG失败信息过程；
步骤2：若UE上有所保存的切换配置，则丢弃/释放所保存的切换配置。
所述MCG失败信息过程在UE检测到MCG失败时发起，用于向基站上报MCG发生失败。可选地，UE在检测到MCG失败且MCG传输未被挂起(suspend)的情况下发起MCG失败信息过程，将所述MCG失败信息如MCG失败原因上报给基站。所述检测到MCG失败可以是检测到MCG的无线链路失败即链路质量差、MCG的同步重配置失败、收到来自底层的SRB或DRB相关的完整性校验失败指示、RRC连接重配置失败、从NR/LTE的移动性失败(即源基站所属系统是NR/LTE系统的不同无线接入技术系统间的移动性失败)等。
在步骤1之前还包括：UE接收来自基站的包含第一条件的切换命令，并保存所述切换命令中的切换配置。所述切换配置指UE根据所述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。所述第一条件指的是切换条件，即UE只有在所述第一条件满足时，才执行切换，应用所述基于该切换命令生成的切换配置。举例来说，第一条件可以是一个测量事件，比如第一条件可以是在持续一段时间内邻小区比服务小区信号质量超过一个门限值。所述邻小区对应切换的目标小区。
所述释放/丢弃所保存的切换配置也可以描述为认为所保存的切换配置无效。
可选地，步骤2还包括停止相对应的切换配置有效性定时器。所述切换配置有效性定时器指UE侧基于该定时器管理所收到和保存的切换配置，简言之，当定时器运行时，UE认为所收到或所存储的切换配置有效；当定时器不运行时，如超时或停止时，UE认为所收到或所存储的切换配置无效，或UE释放/清除/丢弃所收到或所存储的切换配置信息。所述切换配置有效性定时器是由基站通过RRC消息配置 的，如包含切换命令的第一RRC消息，所述有效性定时器的配置包含定时器的值。可选地，所述有效性定时器的配置可以是源小区配置的，也可以是目标小区配置的。可选地，在支持多个切换命令或多个切换目标小区的场景下，所述有效性定时器和/或其配置可以是区分每个切换命令或区分每个目标小区的，或者所述有效性定时器是区分切换命令的或区分目标小区的，而其值为一个所有切换命令或目标小区共用的公共值。
实施例5
该实施例提出了一种在安全更新时的切换配置的管理方法，在UE上执行，包括：
步骤1：UE触发了安全更新过程或UE收到来自基站的包含安全更新指示的RRC消息；
步骤2：若UE上有所保存的切换配置，则丢弃/释放所保存的切换配置。
所述安全更新过程用于更新UE上的安全上下文，如安全算法，安全密钥等，也可称安全密钥更新过程。优选地，所述安全更新指示是RRC消息中的无线承载配置信息元素中包含的密钥更新(keyrefresh)信息元素。
在步骤1之前还包括：UE接收来自基站的包含第一条件的切换命令，并保存所述切换命令中的切换配置。所述切换配置指UE根据所述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。所述第一条件指的是切换条件，即UE只有在所述第一条件满足时，才执行切换，应用所述基于该切换命令生成的切换配置。举例来说，第一条件可以是一个测量事件，比如第一条件可以是在持续一段时间内邻小区比服务小区信号质量超过一个门限值。所述邻小区对应切换的目标小区。
可选地，步骤2还包括停止相对应的切换配置有效性定时器。所述切换配置有效性定时器指UE侧基于该定时器管理所收到和保存的 切换配置，简言之，当定时器运行时，UE认为所收到或所存储的切换配置有效；当定时器不运行时，如超时或停止时，UE认为所收到或所存储的切换配置无效，或UE释放/清除/丢弃所收到或所存储的切换配置信息。所述切换配置有效性定时器是由基站通过RRC消息配置的，如包含切换命令的第一RRC消息，所述有效性定时器的配置包含定时器的值。可选地，所述有效性定时器的配置可以是源小区配置的，也可以是目标小区配置的。可选地，在支持多个切换命令或多个切换目标小区的场景下，所述有效性定时器和/或其配置可以是区分每个切换命令或区分每个目标小区的，或者所述有效性定时器是区分切换命令的或区分目标小区的，而其值为一个所有切换命令或目标小区共用的公共值。
切换配置有效性定时器管理方法
实施例6
该实施例提出了一种切换配置有效性定时器的管理方法，在UE上执行，包括：
步骤1：UE接收来自基站的包含第一条件的第一切换命令；所述第一切换命令是针对第一目标小区的切换命令。
步骤2：UE接收来自基站的又一包含第一条件的第二切换命令，所述第二切换命令是针对第一目标小区的切换命令。
步骤3：UE停止针对第一目标小区的切换配置有效性定时器。所述定时器是所述第一切换命令所关联的定时器。
步骤1还包括：UE接收来自基站的包含第一条件的切换命令，并保存所述切换命令中的切换配置，启动对应的切换配置有效性定时器。所述切换配置指UE根据所述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。所述第一条件指的是切换条件，即UE只有在所述第一条件满足时，才执行切换，应用所述基于该切换命令生成的切换配置。举例来说，第一条件可以是一个测量事件，比如第一条件可以是在持续一段时间内邻小区比服务小区信号质 量超过一个门限值。所述邻小区对应切换的目标小区。在该实施例中，步骤1和步骤2中的第一条件可以相同也可以不同。
所述切换配置有效性定时器指UE侧基于该定时器管理所收到和保存的切换配置，简言之，当定时器运行时，UE认为所收到或所存储的切换配置有效；当定时器不运行时，如超时或停止时，UE认为所收到或所存储的切换配置无效，或UE释放/清除/丢弃所收到或所存储的切换配置信息。所述切换配置有效性定时器是由基站通过RRC消息配置的，如包含切换命令的第一RRC消息，所述有效性定时器的配置包含定时器的值。可选地，所述有效性定时器的配置可以是源小区配置的，也可以是目标小区配置的。可选地，在支持多个切换命令或多个切换目标小区的场景下，所述有效性定时器和/或其配置可以是区分每个切换命令或区分每个目标小区的，或者所述有效性定时器是区分切换命令的或区分目标小区的，而其值为一个所有切换命令或目标小区共用的公共值。
可选地，若对同一个目标小区的不同的条件切换命令(如步骤1和步骤2中的第一切换命令和第二切换命令)或切换配置维护同一个切换配置有效性定时器时，步骤3描述为：重新启动针对第一目标小区的切换配置有效性定时器。
实施例7
该实施例提供了一种基于条件的切换配置有效性定时器管理方法，在UE上执行，包括：
步骤1，接收来自基站的包含第二条件的RRC消息。
步骤2，当第二条件满足时，UE或UE RRC停止切换配置有效性定时器。
所述第二条件由基站通过RRC消息进行配置，该RRC消息可以是系统消息也可以是专用RRC消息，如RRC连接重配置，更进一步可以是包含第一条件的切换命令RRC消息。可选地，第二条件可以是目标小区配置的，也可以是源小区配置的。
基于LTE中定义的测量事件，所述第二条件可以是下述几个事件的一个或多个的任意组合，但不限于下述事件：
事件1：服务小区信号质量测量值大于一个门限值；
事件2：邻小区信号质量测量值小于一个门限值；
事件3：服务小区信号质量测量值大于邻小区信号质量测量值一个门限值；
事件4：服务小区信号质量测量值大于一个门限值以及邻小区信号质量测量值小于另一个门限值。
上述事件中邻小区指的是切换命令中对应的目标小区。可选地，上述事件中服务小区和目标小区可以是不同的无线接入技术(Radio Access Technology，RAT)。可选地，所述第二条件或事件的配置可以是基于LTE中测量事件的配置。举例来说，当第二条件配置为事件3，其中门限值配置为th，触发时长(TimeToTrigger，TTT)值配置为duration时，UE对源小区和目标小区信号质量进行检测，当源小区信号质量测量值大于邻小区信号质量测量值的差值大于等于th，且持续了duration时间时，UE认为第二条件满足。
所述切换配置有效性定时器指UE侧基于该定时器管理所收到和保存的切换配置，简言之，当定时器运行时，UE认为所收到或所存储的切换配置有效；当定时器不运行时，如超时或停止时，UE认为所收到或所存储的切换配置无效，或UE释放/清除/丢弃所收到或所存储的切换配置信息。所述切换配置有效性定时器是由基站通过RRC消息配置的，如包含第一条件的切换命令，所述有效性定时器的配置包含定时器的值。可选地，所述有效性定时器的配置可以是源小区配置的，也可以是目标小区配置的。可选地，在支持多个切换命令或多个切换目标小区的场景下，所述有效性定时器和/或其配置可以是区分每个切换命令或区分每个目标小区的，或者所述有效性定时器是区分切换命令的或区分目标小区的，而其值为一个所有切换命令或目标小区共用的公共值。
在步骤1之前还包括：UE接收来自基站的包含第一条件的切换命令，并保存所述切换命令中的切换配置，启动对应的切换配置有效 性定时器。所述切换配置指UE根据所述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。所述第一条件指的是切换条件，即UE只有在所述第一条件满足时，才执行切换，应用所述基于该切换命令生成的切换配置。举例来说，第一条件可以是一个测量事件，比如第一条件可以是在持续一段时间内邻小区比服务小区信号质量超过一个门限值。所述邻小区对应切换的目标小区。
该实施例同样适用于支持多个切换命令或多个切换目的小区的场景。在这种场景下，本实施例中上述操作是区分切换命令或切换目标小区执行的。具体来说，第二条件的配置可以是每个切换目标小区配置的，也可以是所有切换目标小区共用的；本实施例中上述UE操作中，当一个切换目标小区对应的第二条件满足时，UE仅对相对应的切换目标小区对应的切换配置执行步骤2相应的操作。
实施例8
该实施例提出了一种切换配置有效性定时器的管理方法，在UE上执行，包括：
步骤l：UE执行切换。
步骤2：UE停止切换配置有效性定时器。
步骤1中所述UE执行切换可以是UE基于所保存的切换配置执行条件切换，也可以是传统切换即UE收到不包含第一条件的切换命令后立即执行切换。若步骤1中UE执行条件切换，则在步骤1之前还包括：UE接收来自基站的包含第一条件的切换命令，并保存所述切换命令中的切换配置，启动对应的切换配置有效性定时器。所述切换配置指UE根据所述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。所述第一条件指的是切换条件，即UE只有在所述第一条件满足时，才执行切换，应用所述基于该切换命令生成的切换配置。举例来说，第一条件可以是一个测量事件，比如第一条 件可以是在持续一段时间内邻小区比服务小区信号质量超过一个门限值。所述邻小区对应切换的目标小区。
所述切换配置有效性定时器指UE侧基于该定时器管理所收到和保存的切换配置，简言之，当定时器运行时，UE认为所收到或所存储的切换配置有效；当定时器不运行时，如超时或停止时，UE认为所收到或所存储的切换配置无效，或UE释放/清除/丢弃所收到或所存储的切换配置信息。所述切换配置有效性定时器是由基站通过RRC消息配置的，如包含切换命令的第一RRC消息，所述有效性定时器的配置包含定时器的值。可选地，所述有效性定时器的配置可以是源小区配置的，也可以是目标小区配置的。可选地，在支持多个切换命令或多个切换目标小区的场景下，所述有效性定时器和/或其配置可以是区分每个切换命令或区分每个目标小区的，或者所述有效性定时器是区分切换命令的或区分目标小区的，而其值为一个所有切换命令或目标小区共用的公共值。
优选地，步骤2中所述切换配置有效性定时器指的是除UE当前执行切换的目标小区所对应的切换配置有效性定时器之外的其他切换配置有效性定时器。备选地，步骤2中所述切换配置有效性定时器可以是对所有UE所保存的切换配置中的目标小区对应的切换配置有效性定时器。
步骤1中所述执行切换，也可以描述为应用包含切换命令的RRC配置。
条件命令生成方法
在现有技术中，下发给UE的切换命令是由目标基站生成的，并通过源基站下发给UE，在这个过程中，源基站并不修改所述切换命令。考虑到切换决策是由源基站决定的。在条件切换时，所述用于条件切换的第一条件优选地应该由源基站配置，然而如何在源基站无法修改的切换命令中包含由源基站配置的第一条件成为一个问题。下述实施例针对该问题提出方法。
实施例9
本实施例提出了一种条件切换命令的生成方法，在切换的源基站和目标基站上执行。
步骤1：源基站发起切换准备过程，向目标基站发送包含第一条件的切换准备信息(HandoverPreparationInformation)RRC消息。所述第一条件可以指示目标基站本次切换为条件切换。所述第一条件指的是切换条件，即UE只有在所述第一条件满足时，才执行切换，应用所述基于该切换命令生成的切换配置。举例来说，第一条件可以是一个测量事件，比如第一条件可以是在持续一段时间内邻小区比服务小区信号质量超过一个门限值。所述邻小区对应切换的目标小区。
步骤2：目标基站在接收到源基站发送的包含第一条件的切换准备信息RRC消息后，若目标基站决定接纳所述UE的本次切换，则目标基站向源基站发送包含第一条件的切换命令RRC消息。即目标基站将步骤1中收到的第一条件包含在其生成的切换命令RRC消息中发送给源基站。
步骤3：源基站将收到的包含第一条件的切换命令下发给UE。
在步骤1中所述包含第一条件的切换准备信息RRC消息包含在XnAP切换请求消息中，在步骤2中所述包含第一条件的切换命令RRC消息包含在XnAP切换应答消息中。其中，Xn为NR系统中源基站和目标基站之间的接口，在LTE系统中，对应为X2接口。
实施例10
本实施例提出了一种条件切换命令的生成方法，对应于实施例9，在切换的源基站上执行。
步骤1：源基站发起切换准备过程，向目标基站发送包含第一条件的切换准备信息(HandoverPreparationInformation)RRC消息。所述第一条件可以指示目标基站本次切换为条件切换。所述第一条件指的是切换条件，即UE只有在所述第一条件满足时，才执行切换，应用所述基于该切换命令生成的切换配置。举例来说，第一条件可以是一个测量事件，比如第一条件可以是在持续一段时间内邻小区比服务小区信号质量超过一个门限值。所述邻小区对应切换的目标小区。
步骤2：接收来自目标基站的包含切换命令RRC消息的X2AP或XnAP消息，其中所述切换命令RRC消息包含用于所述用于条件切换的第一条件。
步骤3：向UE下发包含第一条件的切换命令RRC消息。
在步骤1中所述包含第一条件的切换准备信息RRC消息包含在XnAP切换请求消息中，在步骤2中所述包含第一条件的切换命令RRC消息包含在XnAP切换应答消息中。其中，Xn为NR系统中源基站和目标基站之间的接口，在LTE系统中，对应为X2接口。
实施例11
本实施例提出了一种条件切换命令的生成方法，对应于实施例9，在切换的目标基站上执行。
步骤1：接收源基站发送的包含第一条件的切换准备信息(HandoverPreparationInformation)RRC消息。所述第一条件可以指示目标基站本次切换为条件切换。所述第一条件指的是切换条件，即UE只有在所述第一条件满足时，才执行切换，应用所述基于该切换命令生成的切换配置。举例来说，第一条件可以是一个测量事件，比如第一条件可以是在持续一段时间内邻小区比服务小区信号质量超过一个门限值。所述邻小区对应切换的目标小区。
步骤2：在接收到源基站发送的包含第一条件的切换准备信息RRC消息后，若目标基站决定接纳所述UE的本次切换，则向源基站发送包含第一条件的切换命令RRC消息。即目标基站将步骤1中收到的第一条件包含在其生成的切换命令RRC消息中发送给源基站。
在步骤1中所述包含第一条件的切换准备信息RRC消息包含在XnAP切换请求消息中，在步骤2中所述包含第一条件的切换命令RRC消息包含在XnAP切换应答消息中。其中，Xn为NR系统中源基站和目标基站之间的接口，在LTE系统中，对应为X2接口。
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。
图5示出了根据本公开实施例的用户设备UE50的框图。如图5所示，UE50包括处理器510和存储器520。处理器510例如可以包括微处理器、微控制器、嵌入式处理器等。存储器520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520上存储有程序指令。该指令在由处理器510运行时，可以执行本公开详细描述的用户设备中的上述方法。
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方法，包括：
    接收包含切换条件的切换命令，保存所述切换命令中的切换配置，其中，所述切换条件用于当所述切换条件满足时由所述用户设备执行所述切换条件对应的切换配置；和
    在检测到主小区组MCG失败或者需要进行安全更新的情况下，至少执行与所保存的切换配置有关的操作。
  2. 根据权利要求1所述的方法，其中，
    在检测到MCG失败的情况下，触发无线资源控制RRC连接重建立过程，并丢弃所保存的切换配置。
  3. 根据权利要求1所述的方法，其中，
    在检测到MCG失败的情况下，基于所保存的切换配置执行切换，接入到目标小区。
  4. 根据权利要求1所述的方法，其中，
    在检测到需要进行安全更新的情况下，丢弃所保存的切换配置。
  5. 一种由用户设备执行的方法，包括：
    接收包含第一切换条件的第一切换命令，保存所述第一切换命令中的第一切换配置，并启动与所述第一切换配置对应的第一切换配置有效性定时器，其中，所述第一切换条件用于当所述第一切换条件满足时由所述用户设备执行所述第一切换条件对应的所述第一切换配置，所述第一切换配置有效性定时器用于规定所述第一切换配置的有效期间；和
    在从网络侧接收到指示信息的情况下，根据所述指示信息来停止或重新启动所述第一切换配置有效性定时器。
  6. 根据权利要求5所述的方法，其中，
    在作为所述指示信息而接收到包含第一切换条件的第二切换命令的情况下，若所述第二切换命令与所述第一切换命令对应同一个目标小区且关联同一个切换配置有效性定时器，则重新启动所述第一切换配置有效性定时器，否则停止所述第一切换配置有效性定时器。
  7. 根据权利要求5所述的方法，其中，
    在作为所述指示信息而接收到包含停止条件的无线资源控制RRC消息的情况下，当所述停止条件满足时，停止所述第一切换配置有效性定时器。
  8. 根据权利要求5所述的方法，其中，
    在作为所述指示信息而接收到不包含切换条件的切换命令的情况下、或者在所述第一切换条件满足的情况下，执行切换，并停止所述第一切换配置有效性定时器。
  9. 一种切换命令生成方法，用于生成从源基站向目标基站切换的包含切换条件的切换命令，其中，所述切换条件用于当所述切换条件满足时由用户设备执行所述切换条件对应的切换，
    所述切换命令生成方法包括：
    从所述源基站向所述目标基站发送包含切换条件的切换准备信息无线资源控制RRC消息；
    所述目标基站在接收到所述切换准备信息RRC消息后，在决定接纳本次切换的情况下，将所述切换条件包含在切换命令RRC消息中发送给所述源基站；和
    所述源基站将接收到的包含所述切换条件的切换命令发送给用户设备。
  10. 一种用户设备，包括：
    处理器；和
    存储器，存储有指令，
    其中，所述指令在由所述处理器运行时执行根据权利要求1至8中任一项所述的方法。
PCT/CN2019/098851 2018-08-27 2019-08-01 由用户设备执行的方法、用户设备以及切换命令生成方法 Ceased WO2020042863A1 (zh)

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