WO2019134329A1 - 一种系统间切换的方法和装置 - Google Patents

一种系统间切换的方法和装置 Download PDF

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Publication number
WO2019134329A1
WO2019134329A1 PCT/CN2018/087784 CN2018087784W WO2019134329A1 WO 2019134329 A1 WO2019134329 A1 WO 2019134329A1 CN 2018087784 W CN2018087784 W CN 2018087784W WO 2019134329 A1 WO2019134329 A1 WO 2019134329A1
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Prior art keywords
session
network side
side device
system session
core network
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PCT/CN2018/087784
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English (en)
French (fr)
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WO2019134329A8 (zh
Inventor
刘建华
杨宁
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/CN2018/070243 external-priority patent/WO2019134076A1/zh
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to CN201880064683.3A priority Critical patent/CN111183675B/zh
Publication of WO2019134329A1 publication Critical patent/WO2019134329A1/zh
Publication of WO2019134329A8 publication Critical patent/WO2019134329A8/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/18Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H04W36/185Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection using make before break
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements

Definitions

  • the present application relates to the field of wireless communication technologies, and in particular, to a method and apparatus for inter-system handover.
  • the 5G cellular network is mainly composed of three domains: 5GC (core network), NG-RAN (access network), and UE (user equipment).
  • 5GC core network
  • NG-RAN access network
  • UE user equipment
  • the NG-RAN has a scenario in which both the gNB (the base station in the 5G network) and the eNB (the base station in the 4G network) access the 5G CN, as shown in FIG. 1 .
  • the base station of the NG-RAN sends a Handover Required message to the AMF (Access Mobility Management Function), thereby triggering the inter-system handover.
  • AMF Access Mobility Management Function
  • the present application provides a method and apparatus for inter-system handover, so as to reduce the delay generated when an inter-system handover occurs in a UE.
  • the application provides a method for inter-system handover, the method comprising:
  • the network side device determines to trigger a handover of the UE from the first system to the second system
  • the switching from the first system session to the corresponding second system session is performed to release the first system session.
  • the method further includes:
  • the first system session identifier and the MBB correspondence are performed in the first system session establishment/modification process, and the first system core network side device is configured according to the first system session.
  • the session characteristics and preset switching strategies are determined.
  • the session feature comprises: S-NSSAI and/or DNN.
  • the first system core network side device sends the indication information of the MBB for the first system session to the first system access network side device when the first system session is established or modified;
  • the first system access network side device carries the indication information when initiating a handover from the first system to the second system.
  • the system sends the preset identifier information to the second system core network side device through the inter-system N26 interface. Switching request message;
  • the second system core network side device prepares the second system session for the UE according to the preset identification information.
  • the system after the first system access network side device determines to trigger the handover of the first system of the UE to the second system, the system sends the preset identifier information to the core network side device of the second system through the inter-system N26 interface.
  • Switch request message
  • the second core network side device prepares the second system session for the UE according to the preset identification information.
  • the method further includes:
  • Preparing for the second system session for the UE includes: context mapping of mobility management and session management.
  • the preparing further includes: allocating, for the second system session, the same IP address as the corresponding first system session.
  • the system after the first system access network side device determines to trigger the handover of the first system of the UE to the second system, the system sends the preset identifier information to the core network side device of the second system through the inter-system N26 interface.
  • Switch request message
  • the second system core network side device prepares the second system session for the UE according to the preset identification information.
  • notifying the UE to establish a second system session corresponding to the first system session being used includes:
  • the method further includes:
  • the second system core network side device After receiving the connection request that is sent by the UE and including the preset identifier information, the second system core network side device establishes the second system session for the UE.
  • performing a handover from the first system session to a corresponding second system session, releasing the first system session includes:
  • the second system core network side device switches the application data flow from the first system session to the corresponding second system session to release the first system session.
  • performing a handover from the first system session to a corresponding second system session, releasing the first system session includes:
  • the first core network side device After receiving the release session message sent by the UE, the first core network side device releases the first system session to switch the application data flow from the first system session to the corresponding second system session.
  • the method further includes:
  • the second system core network side device After the switching from the first system session to the corresponding second system session, the second system core network side device sends a handover complete message to the unified data management device, triggering the unified data management device to be in the first system for the UE. To register; or,
  • the first system core network side device sends a request to the unified data management device, and triggers the unified data management device to perform deregistration for the UE in the first system.
  • the handover complete message includes: a location update Update Location message including an initial attach Initial attach parameter.
  • the method further includes:
  • the network-side device After receiving the registration request or the location update request that is sent by the UE and carrying the dual-pass capability information, the network-side device determines whether the UE is allowed to use the dual-pass capability, and records the determination result;
  • the method further includes:
  • the information about whether to allow the UE to use the dual-pass capability is returned to the UE in a registration response or a location update response.
  • data transmission between the network side device and the UE is performed simultaneously on the first system session and the second system session.
  • the first system is a 5G system
  • the second system is a 4G system
  • the second system is a 4G system, and the first system is a 5G system; or
  • the first system and the second system are respectively different base station type systems under the same core network.
  • the application provides a registration method, the method comprising:
  • the network side device receives the registration request or the location update request sent by the UE, where the registration request or the location update request carries the dual-pass capability information;
  • the dual-pass capability information indicates that the UE can establish a second system session corresponding to the first system session being used in the dual-pass mode.
  • the method further includes:
  • the method further includes:
  • the information about whether to allow the UE to use the dual-pass capability is returned to the UE in a registration response or a location update response.
  • the present application provides a method for inter-system handover, the method comprising:
  • the first system access network side device After the first system access network side device determines that the first system of the UE is triggered to switch to the second system, the first system access network side device sends a handover request message that includes preset identification information to the second system core network side device;
  • the second system core network side device prepares the second system session for the UE according to the preset identification information.
  • the application provides a method for inter-system handover, the method comprising:
  • the first system network side device sends a command including preset identification information to the UE to instruct the UE to establish a second system session corresponding to the first system session being used in the two-pass mode.
  • the first system network side device includes:
  • the first system core network side device or the first system accesses the network side device.
  • the command including preset identifier information includes: a NAS message or an RRC reconfiguration message.
  • the method further includes:
  • the second system core network side device After receiving the connection request that is sent by the UE and including the preset identifier information, the second system core network side device establishes the second system session for the UE.
  • the application provides a method for inter-system handover, the method comprising:
  • the UE After receiving the notification of the network side device, the UE establishes a second system session corresponding to the first system session being used in a two-pass mode;
  • the mode is switched back to the single pass mode.
  • the receiving, by the UE, the notification of the network side device includes:
  • the UE receives a command that is sent by the network side device and includes preset identifier information.
  • the establishing, by using the two-pass mode, the second system session corresponding to the first system session being used includes:
  • the UE sends a connection request including preset identification information to the second system core network side device to establish the second system session.
  • the method further includes:
  • the UE sends a release session message to the first system core network side device to release the first system session and switch the application data flow from the first system session to the corresponding second system session.
  • the method before the completing the switching, the method further includes:
  • Data transmission between the UE and the network side device is performed simultaneously on the first system session and the second system session.
  • the first system is a 5G system
  • the second system is a 4G system
  • the second system is a 4G system
  • the first system is a 5G system.
  • the application further provides a registration method, the method comprising:
  • the UE sends a registration request or a location update request to the network side device, where the registration request or the location update request carries the dual-pass capability information;
  • the dual-pass capability information indicates that the UE can establish a second system session corresponding to the first system session being used in the dual-pass mode.
  • the method further includes:
  • the registration response or the location update response includes information about whether the network side device allows the UE to use the dual-pass capability.
  • the application provides a method for inter-system handover, the method comprising:
  • a two-pass mode is used to establish a second system session corresponding to the first system session being used.
  • the first system network side device includes:
  • the first system core network side device or the first system accesses the network side device.
  • the command including preset identifier information includes: a NAS message or an RRC reconfiguration message.
  • the establishing, by using the two-pass mode, the second system session corresponding to the first system session being used includes:
  • the UE sends a connection request including preset identification information to the second system core network side device to establish the second system session.
  • the application provides an apparatus for switching between systems, which is disposed on a network side, and the apparatus includes:
  • a first determining unit configured to determine to trigger a handover of the UE from the first system to the second system
  • a notification unit configured to notify the UE to establish a second system session corresponding to the first system session being used in a two-pass mode
  • a switching unit configured to perform a handover from the first system session to a corresponding second system session, releasing the first system session.
  • the device further includes:
  • a determining unit configured to determine whether the MBB switching is performed for the first system session, by using a predetermined first system session identifier and whether to perform a first-pass/down MBB correspondence;
  • the notification unit when the decision result of the decision unit is YES, performs the process of notifying the UE to establish a second system session corresponding to the first system session being used in the two-pass mode.
  • the first system session identifier and the MBB correspondence are performed in the first system session establishment/modification process, and the first system core network side device is configured according to the first system session.
  • the session characteristics and preset switching strategies are determined.
  • the session feature comprises: S-NSSAI and/or DNN.
  • the indication unit of the first system core network side device can send the indication information of the MBB for the first system session to the first system when the first system session is established or modified.
  • the first determining unit is configured to be in the first system access network side device, and is further configured to carry the indication information when initiating a handover from the first system to the second system.
  • the first determining unit is disposed on the first system core network side device, and is further configured to determine, after the first system that triggers the UE is switched to the second system, to the second through the inter-system N26 interface.
  • the system core network side device sends a handover request message that includes preset identifier information;
  • the device further includes: a preparation unit disposed on the core network side of the second system, configured to prepare the second system session for the UE according to the preset identification information.
  • the first determining unit is configured to be in the first system access network side device, and is further configured to determine, after the first system that triggers the UE is switched to the second system,
  • the core network side device of the second system sends a handover request message that includes preset identification information
  • the preparation unit is configured to prepare the second system session for the UE according to the preset identification information.
  • the device further includes:
  • a preparation unit configured to prepare a second system session for the UE after the first determining unit determines to trigger a handover of the UE from the first system to the second system, where the preparation includes: mobility management and session management Context mapping.
  • the preparing further includes: allocating, for the second system session, the same IP address as the corresponding first system session.
  • the first determining unit is disposed on the first system access network side, and the first determining unit is further configured to send, by using the inter-system N26 interface, the preset to the second system core network side. a handover request message for identifying information;
  • the preparation unit is configured on the core network side of the second system, and prepares the second system session for the UE according to the preset identification information.
  • the notification unit is specifically configured to send a command including preset identifier information to the UE, to instruct the UE to establish a dual-pass mode to establish a first system session corresponding to the first system session being used. Second system session.
  • the apparatus further includes: an establishing unit, configured to be configured on the core network side of the second system, configured to establish a connection request for the UE after receiving a connection request that is sent by the UE and includes preset identifier information. Said second system session.
  • the switching unit is disposed on a core network side of the second system, and specifically executes:
  • the switching of the application data flow from the first system session to the handover of the corresponding second system session releases the first system session.
  • the switching unit includes a unit disposed on a core network side of the second system and a unit disposed on a core network side of the first system;
  • the unit disposed on the core network side of the second system is configured to notify the UE to switch the application data flow from the first system session to the corresponding second system session;
  • the unit disposed on the core network side of the first system releases the first system session after receiving the release session message sent by the UE, to switch the application data flow from the first system session to the corresponding second system. Conversation.
  • the device further includes:
  • a de-registration unit configured to send a handover completion message to the unified data management device, after the handover unit completes the handover from the first system session to the corresponding second system session, and triggers Deleting the unified data management device for the UE in the first system;
  • a deregistration unit configured to send a request to the unified data management device, to trigger the unified data management device to perform deregistration for the UE in the first system.
  • the handover complete message includes: a location update Update Location message including an initial attach Initial attach parameter.
  • the device further includes:
  • a transmitting unit configured to perform data transmission between the network side device and the UE simultaneously on the first system session and the second system session before the switching unit completes the switching.
  • the first system is a 5G system
  • the second system is a 4G system
  • the second system is a 4G system, and the first system is a 5G system; or
  • the first system and the second system are respectively different base station type systems under the same core network.
  • the application provides a registration device, which is disposed on a network side, and includes:
  • a receiving unit configured to receive a registration request or a location update request sent by the UE, where the registration request or the location update request carries the dual-pass capability information;
  • the dual-pass capability information indicates that the UE can establish a second system session corresponding to the first system session being used in the dual-pass mode.
  • the device further includes:
  • a second determining unit configured to determine whether the UE is allowed to use the dual-pass capability, and record the determination result.
  • the device further includes:
  • a response unit configured to carry information about whether to allow the UE to use the dual-pass capability to be returned to the UE in a registration response or a location update response.
  • the application provides an apparatus for inter-system handover, the apparatus comprising:
  • a sending unit configured to send, after the first system access network side, the handover of the first system that triggers the UE to the second system, to the second system core network side, the handover request message that includes the preset identifier information;
  • the preparation unit is configured on the core network side of the second system, and is configured to prepare the second system session for the UE according to the preset identifier information.
  • the present application provides an apparatus for inter-system handover, the apparatus comprising:
  • a sending unit configured to send, by the UE, a command including preset identifier information to the UE, to instruct the UE to establish a second system session corresponding to the first system session being used in the dual-pass mode.
  • the first system network side device includes:
  • the first system core network side device or the first system accesses the network side device.
  • the command including preset identifier information includes: a NAS message or an RRC reconfiguration message.
  • the device includes:
  • the establishing unit is configured to be configured on the core network side of the second system, and configured to establish the second system session for the UE after receiving the connection request that is sent by the UE and includes the preset identifier information.
  • the present application further provides an apparatus for inter-system handover, which is disposed in a UE, and the apparatus includes:
  • a receiving unit configured to receive a notification of the network side device
  • a establishing unit configured to establish, by using the two-pass mode, a second system session corresponding to the first system session being used after the receiving unit receives the notification of the network side device;
  • a switching unit configured to switch back to the single pass mode after the handover from the first system session to the corresponding second system session is completed.
  • the receiving unit specifically executes:
  • the establishing unit specifically executes:
  • the switching unit is further configured to send a release session message to the first system core network side device to release the first system session and switch the application data flow from the first system session. Go to the corresponding second system session.
  • the device further includes:
  • a transmitting unit configured to perform data transmission between the UE and the network side device simultaneously on the first system session and the second system session before the switching unit completes the handover.
  • the application provides a registration device, which is disposed in a UE, and the device includes:
  • a sending unit configured to send a registration request or a location update request to the network side device, where the registration request or the location update request carries the dual-pass capability information
  • the dual-pass capability information indicates that the UE can establish a second system session corresponding to the first system session being used in the dual-pass mode.
  • the device further includes:
  • a receiving unit configured to receive a registration response or a location update response returned by the network side device, where the registration response or location update response includes information about whether the network side device allows the UE to use dual-pass capability.
  • the present application provides an apparatus for inter-system handover, the apparatus comprising:
  • a receiving unit configured to receive a command that is sent by the first system network side device and includes preset identifier information
  • a setup unit is configured to establish a second system session corresponding to the first system session being used in a two-pass mode.
  • the first system network side device includes:
  • the first system core network side device or the first system accesses the network side device.
  • the command including preset identifier information includes: a NAS message or an RRC reconfiguration message.
  • the establishing unit specifically executes:
  • the application also provides an apparatus, including
  • One or more processors are One or more processors;
  • One or more programs the one or more programs being stored in the memory, the operations in the above methods being performed by the one or more processors.
  • the present application also provides a storage medium containing computer executable instructions for performing the operations of the above methods when executed by a computer processor.
  • the network side device in the application is configured to notify the UE to establish a second corresponding to the first system session being used in the dual-pass mode.
  • the system session performs a handover of the first system session to the corresponding second system session to release the first system session.
  • FIG. 1 is a schematic diagram of a scenario provided by an embodiment of the present application.
  • FIG. 3 is a flowchart of a method for system switching according to Embodiment 2 of the present application.
  • FIG. 5a and FIG. 5b are schematic diagrams showing states of a UE in various stages according to an embodiment of the present application.
  • FIG. 6 is a flowchart of a method for switching a system component according to Embodiment 4 of the present invention.
  • FIG. 8 is a structural diagram of an apparatus for switching between systems provided on a network side according to Embodiment 6 of the present application.
  • FIG. 9 is a structural diagram of a registration device installed on a network side according to Embodiment 7 of the present application.
  • FIG. 10 is a structural diagram of an apparatus for switching between systems provided on a network side according to Embodiment 8 of the present application;
  • FIG. 11 is a structural diagram of an apparatus for switching between systems provided on a network side according to Embodiment 9 of the present application.
  • FIG. 12 is a structural diagram of an apparatus for inter-system handover provided in a UE according to Embodiment 10 of the present application;
  • FIG. 13 is a structural diagram of a registration device installed in a UE according to Embodiment 11 of the present application.
  • FIG. 14 is a structural diagram of an apparatus for inter-system handover provided in a UE according to Embodiment 12 of the present application.
  • the core idea of the present application is that after the network side determines to trigger the handover of the UE from the first system to the second system, the UE is notified to establish a second system session corresponding to the first system session being used in the dual-pass mode; The switching of a system session to a corresponding second system session releases the first system session.
  • the present application can be used to implement switching between two communication systems, for example, switching from a 5G system to a 4G system, and for example, switching from a 4G system to a 5G system can be realized.
  • switching from a 5G system to a 4G system is taken as an example.
  • the inter-system handover of different base station types under the same core network is implemented, and in the subsequent embodiments 4 and 5, the NR base station system is switched to the LTE base station system under the 5G core network.
  • FIG. 2 is a flowchart of a method for switching between systems according to Embodiment 1 of the present application. As shown in FIG. 2, the method may include the following steps:
  • the 5G access network side device determines to trigger the handover of the UE from the 5G system to the 4G system.
  • the 5G access network side device sends a Handover Required message to the 4G core network side device, where the Handover Required message carries preset identification information.
  • the Handover Required message of the preset identification information may be sent to the AMF (Access Mobility Management Function) through the inter-system interface (N26 interface), for example, carrying the Make Before Break (first pass) Broken) identification.
  • AMF Access Mobility Management Function
  • the 4G core network side device prepares for a 4G system session, which may include context mapping of mobility management and session management, and may also include IP address allocation of the 4G system session.
  • the AMF may send a session management context mapping request (SM Context Request) to the PGW (Public Network Gateway) of the 4G core network, and the context mapping of the session management is completed by the PGW.
  • SM Context Request session management context mapping request
  • PGW Public Network Gateway
  • the response message (SM Context Response) is returned to the AMF; the AMF sends a Relocation Request to the MME (Mobility Management Entity), and the MME sends a Create Session Request to the SGW (Serving Gateway), SGW.
  • MME Mobility Management Entity
  • SGW Serving Gateway
  • the MME sends a handover request (Handover Request) to the E-UTRAN (4G access network side device), and returns a response message (Handover Request Ack) by the E-UTRAN; then the MME returns a Relocation to the AMF. Response.
  • Handover Request handover request
  • E-UTRAN E-UTRAN 4G access network side device
  • Handover Request Ack response message
  • the data filters, QoS parameters, and the like included in the second system session are the same as the data filters, QoS parameters, and the like included in the corresponding first system session. That is, the data stream transmitted in the first system session can also be transmitted on the second session, and can also have the same QoS guarantee.
  • the IP address assigned by the PGW to the session (PDN Connection) of the 4G system is the same as the IP address of the corresponding PDU Session of the 5G system. It should be noted that if the UE has a PDU Session in the 5G system, a corresponding PDN Connection is established for the PDU Session, and the IP addresses of the two are the same. If the UE is in the PDU Session of the 5G system, the corresponding PDN Connection is established for each PDU Session, and the IP addresses of the two corresponding sessions are the same.
  • the 4G core network side device sends a command including preset identification information to the UE.
  • the AMF may send a command including the Make Before Break identifier to the UE, or the NG-RAN may send a command including the Make Before Break identifier to the UE. In this case, the NG-RAN may receive the AMF transmission. After the Handover Command is executed).
  • the above command may be a NAS message or an RRC reconfiguration message.
  • the UE sends a connection request including preset identification information to the 4G core network side device in the dual-pass mode.
  • the UE is typically in single pass mode, ie a mode that only uses or resides in one communication system.
  • the UE receives the command including the Make Before Break identifier, and according to the Make Before Break identifier, it is required to establish a 4G system session in the dual-pass mode. Then, the UE may switch to the dual-pass mode, and send a connection request including the Make Before Break identifier to the MME, and the connection request may be an Attach message or a Handover notify message.
  • the dual-pass mode refers to a mode that can be used simultaneously or resides in two communication systems, and needs to be registered in two communication systems.
  • the 4G core network side device establishes a 4G system session for the UE.
  • the MME may request the PGW to establish a PDN Connection corresponding to the PDU Session that the UE is using according to the preparation made by the previous 4G core network.
  • the PDU Session is not immediately released, but the PDU Session and the PDN Connection are maintained at the same time.
  • the 4G core network side device performs a handover from the 5G system session to the corresponding 4G system session, releasing the 5G system session.
  • the PGW After the PGW establishes the PDN connection, the PGW performs a Path Switch to switch the application data flow from the PDU Session to the PDN Connection and release the PDU Session.
  • data transmission between the network side device and the UE can be performed on both the PDU Session and the PDN Connection. That is, the PGW performs Duplication transmission on the downlink data, and the downlink data is transmitted on the PDU Session, and the same data is copied and transmitted on the PDN Connection. The UE also performs Duplication transmission on the uplink data, and transmits the uplink data on the PDU Session while copying the same data on the PDN Connection.
  • the 4G core network side device performs deregistration of the UE in the 5G system.
  • the MME may be notified; then, the MME sends a handover complete message, such as an Update Location message, to the unified data management device (such as the HSS/UDM), where the Update location message includes the initial attachment.
  • a handover complete message such as an Update Location message
  • the unified data management device such as the HSS/UDM
  • the (Initial attach) parameter triggers the HSS/UDM to execute a Cancel location message on the 5G system.
  • the MME can be notified, and then the MME notifies the UE, and the UE can switch back to the single-pass mode from the dual-pass mode.
  • the MBB switching policy may be configured based on the user granularity in the UDM (Contract Information Database) and/or the PCF (Policy Control Network Element) in advance, or the MBB switching policy may be statically configured in the SMF in advance.
  • UDM Contract Information Database
  • PCF Policy Control Network Element
  • the MBB switching policy may be a policy for determining whether to perform MMB switching for the session based on the preset session characteristics.
  • the session features may include, but are not limited to, S-NSSAI (Single Network Slice S election Assistance information) and/or DNN.
  • the configured policy can be as follows:
  • MBB switching is not performed.
  • the SMF determines whether the 5G system session performs MBB according to the locally configured policy or according to the policy acquired from the UDM/PCF, and according to the policy and the feature information of the 5G system session. Switching, and storing the correspondence between the ID of the 5G system session and whether to perform MBB switching is stored locally.
  • the SMF may send the indication information of performing the MBB handover to the NG-RAN after the 5G system session is established or modified, and the NR-RAN performs the foregoing step 102, that is, sends the message to the 4G core network side device.
  • Handover Required message carrying the MBB identifier.
  • the NR-RAN may send a Handover Required message in the existing manner, where the MBB identifier is not carried, but carries the ID information of the 5G system session.
  • the AMF obtains information about whether to perform MBB handover for the 5G system session from the SMF (for example, obtaining, by using the Nsf_RDUSesion_ContextRSP message, whether the SMF returns information for performing MBB handover for the 5G system session), and if so, the AMF connection Perform step 104 above.
  • FIG. 3 is a flowchart of a method for system switching provided by Embodiment 2.
  • the implementation flow of this embodiment differs from Embodiment 1 in the execution of handover and deregistration.
  • the method may include the following steps:
  • Steps 201 to 206 are the same as steps 101 to 106 in the first embodiment, and are not described herein.
  • the 4G core network side device notifies the UE to complete the handover from the 5G system session to the corresponding 4G system session.
  • the PGW After the PGW establishes the PDN Connection, the PGW notifies the MME that the MME further notifies the UE to perform Path Switch.
  • data transmission between the network side device and the UE can be performed on both the PDU Session and the PDN Connection. That is, the PGW performs Duplication transmission on the downlink data, and the downlink data is transmitted on the PDU Session, and the same data is copied and transmitted on the PDN Connection. The UE also performs Duplication transmission on the uplink data, and transmits the uplink data on the PDU Session while copying the same data on the PDN Connection.
  • the UE sends a release session message to the 5G core network side device.
  • the UE may notify the AMF to release the 5G system session through the NAS message.
  • the 5G core network side device releases the 5G system session.
  • the application data stream is switched from the PDU Session to the corresponding PDN Connection.
  • the UE After the UE completes the handover, it can switch from the dual-pass mode to the single-pass mode.
  • the 5G core network side device sends a request to the unified data management device (such as HSS/UDM), triggering the unified data management device to perform deregistration for the UE in the 5G system.
  • the unified data management device such as HSS/UDM
  • the Purge request may be sent to the HSS/UDM to delete the registration information of the UE in the 5G system.
  • the process may include the following steps:
  • the UE sends a registration request to the network side device, where the registration request carries the dual-pass capability information.
  • the UE when registering with the 5G system, may carry the dual-pass capability information in the Registration Request sent to the network-side device of the 5G system, where the dual-pass capability information indicates that the UE can adopt the dual-pass The mode establishes a 4G system session corresponding to the 5G system session being used.
  • the Registration Request is sent by the UE to the NG-RAN, and can be further sent by the NG-RAN to the AMF.
  • the network side device determines whether the UE is allowed to use the dual pass capability and records the determination result.
  • the NG-RAN may determine whether to allow the UE to use the dual-pass capability and record the determination result.
  • the NG-RAN checks the record when the UE is triggered to switch from the 5G system to the 4G system. If the UE is allowed to use the dual-pass capability, the NG-RAN continues in the first embodiment or the second embodiment. Process execution; otherwise, you can perform the switch according to an existing process or another process.
  • the network side device returns the determination result to the UE in the registration response.
  • the NG-RAN may include information about whether the user is allowed to use the dual-pass capability in the Registration Accept message and return it to the UE.
  • the location update request may be used to carry the dual-pass capability information of the UE.
  • the network-side device may include information about whether the user is allowed to use the dual-pass capability. Returned to the UE in the location update response message.
  • the "Make Before Break” mode is adopted, and the mode can be as shown in FIG. 5a. Before switching, it is in single-pass mode and uses a 5G system session. During the handover process, it is in dual-pass mode while maintaining 5G system sessions and 4G system sessions. After the handover is completed, the mode is switched back to the single-pass mode, and the 5G system session is released, and only the 4G system session is used.
  • the above embodiment is described by taking the example of switching from a 5G system to a 4G system.
  • the method provided by the present application is also applicable to switching from a 4G system to a 5G system, and the specific implementation process is similar to the device of the 5G system involved.
  • the equipment of the 4G system can be reversed.
  • FIG. 6 is a flowchart of a system switching method according to Embodiment 4 of the present invention.
  • an example is performed by switching from an NR base station system in an 5G core network to an LTE base station system.
  • the mode is as shown in Figure 5b, in single-pass mode before handover, using a system session via the NR base station, in the two-pass mode during handover, while maintaining the system session via the NR base station and via System session of an LTE base station.
  • the method may include the following steps:
  • the NR base station in the 5G core network determines to trigger the UE to switch from the NR base station system to the LTE base station system in the 5G core network.
  • the NR base station sends a Handover Required message to the 5G core network side device, where the Handover Required message carries preset identification information.
  • the Handover Required message of the preset identification information may be sent to the AMF through the inter-system interface (N26 interface), for example, carrying the Make Before Break identifier.
  • the 5G core network side device sends a command including preset identification information to the UE.
  • the AMF may send a command including the Make Before Break identifier to the UE, or the NG-RAN may send a command including the Make Before Break identifier to the UE. In this case, the NG-RAN may receive the AMF transmission. After the Handover Command is executed).
  • the above command may be a NAS message or an RRC reconfiguration message.
  • the UE sends a connection request including preset identification information to the LTE base station under the 5G core network in the dual-pass mode.
  • the UE is normally in the single-pass mode, and the UE receives the command including the Make Before Break identifier, and according to the Make Before Break identifier, it is required to establish a session with the target system in the dual-pass mode, and the UE can switch to the dual-pass mode to the 5G core network.
  • the LTE base station sends a connection request including the Make Before Break identifier.
  • the LTE base station under the 5G core network sends a connection request including preset identification information to the 5G core network side device.
  • the 5G core network side device establishes a system session for the UE via the LTE base station.
  • the LTE base station sends a connection request including the Make Before Break identifier to the AMF, and the AMF may request the PGW to establish a second PDU Session corresponding to the first PDU Session being used by the UE.
  • the first PDU Session is via the NR base station
  • the second PDU Session is via the LTE base station, and the two use different port numbers.
  • the first PDU Session is not immediately released, but the first PDU Session and the second PDU Session are simultaneously maintained.
  • the 5G core network side device performs a system session from the system session via the NR base station to the corresponding system session via the LTE base station, releasing the system session via the NR base station.
  • the PGW After the second PDU session is established, the PGW performs a Path Switch to switch the application data flow from the first PDU Session to the second PDU Session, and releases the first PDU Session.
  • data transmission between the network side device and the UE can be performed on both the first PDU Session and the second PDU Session. That is, the PGW performs Duplication transmission on the downlink data, and the downlink data is transmitted on the first PDU Session, and the same data is copied and transmitted on the second PDU Session. The UE also performs Duplication transmission on the uplink data, and transmits the uplink data on the first PDU Session, and copies the same data on the second PDU Session.
  • the 5G core network side device performs deregistration of the UE in the LTE base station system.
  • the PGW may notify the AMF that the AMF sends a handover complete message, such as an Update Location message, to the unified data management device (such as the HSS/UDM), where the Update location message includes the initial attachment. (Initial attach) parameter, which triggers the HSS/UDM to send a Cancel location message to the AMF.
  • a handover complete message such as an Update Location message
  • the unified data management device such as the HSS/UDM
  • the Update location message includes the initial attachment. (Initial attach) parameter, which triggers the HSS/UDM to send a Cancel location message to the AMF.
  • the AMF can be notified, and then the AMF notifies the UE, and the UE can switch from the dual-pass mode to the single-pass mode.
  • FIG. 7 is a flowchart of a method for system switching provided in Embodiment 5. The difference between the execution process of this embodiment and the fourth embodiment is the process of switching and de-registering. As shown in FIG. 7, the method may include the following steps:
  • Steps 701 to 706 are the same as steps 601 to 606 in the fourth embodiment, and are not described herein.
  • the 5G core network side device notifies the UE to complete the handover from the system session via the NR base station to the system session corresponding to the LTE base station.
  • the PGW After establishing the second PDU session, the PGW notifies the AMF that the AMF further notifies the UE to perform Path Switch.
  • data transmission between the network side device and the UE can be performed on both the first PDU Session and the second PDU Session. That is, the PGW performs Duplication transmission on the downlink data, and the downlink data is transmitted on the first PDU Session, and the same data is copied and transmitted on the second PDU Session. The UE also performs Duplication transmission on the uplink data, and transmits the uplink data on the first PDU Session, and copies the same data on the second PDU Session.
  • the UE sends a release session message to the 5G core network side device.
  • the UE may inform the AMF via the NAS message to release the system session via the NR base station.
  • the 5G core network side device releases the system session via the NR base station.
  • the 5G core network side device releases the first PDU session, and the application data stream is switched from the first PDU session to the corresponding second PDU session. After the UE completes the handover, it can switch from the dual-pass mode to the single-pass mode.
  • the 5G core network side device sends a request to the unified data management device (such as HSS/UDM), triggering the unified data management device to perform deregistration for the UE in the NR base station system.
  • the unified data management device such as HSS/UDM
  • the AMF releases the system session via the NR base station, or afterwards, may send a Purge request to the HSS/UDM to delete the registration information of the UE in the NR base station system.
  • FIG. 8 is a structural diagram of an apparatus for switching between systems provided on a network side according to Embodiment 6 of the present application.
  • the apparatus may include: a first determining unit 01, a notification unit 02, and a switching unit 03; Further includes a preparation unit 04, an establishment unit 05, and a deregistration unit 06.
  • the main functions of each component are as follows:
  • the first determining unit 01 is responsible for determining to trigger a handover of the UE from the first system to the second system.
  • the notification unit 02 is responsible for informing the UE to establish a second system session corresponding to the first system session being used in the two-pass mode.
  • the switching unit 03 is responsible for performing a handover from the first system session to the corresponding second system session, releasing the first system session.
  • the preparation unit 04 is responsible for preparing the second system session for the UE after the first determining unit 01 determines to trigger the handover of the UE from the first system to the second system, and prepares to include: context mapping of mobility management and session management, the preparation It may also include assigning the second system session the same IP address as the corresponding first system session. It should be noted that if the UE has a session in the first system, a corresponding second system session is established for the session, and the IP addresses of the two are the same. If the UE is in a plurality of sessions in use in the first system, a corresponding second system session is established for each session in use, and the IP addresses of the two corresponding sessions are the same.
  • the data filters, QoS parameters, and the like included in the second system session are the same as the data filters, QoS parameters, and the like included in the corresponding first system session. That is, the data stream transmitted in the first system session can also be transmitted on the second session, and can also have the same QoS guarantee.
  • the first determining unit 01 may be disposed on the first system access network side, and may also be configured to send, by using the inter-system interface (N26), a handover request message that includes preset identification information to the second system core network side.
  • the preparation unit 04 may be disposed on the core network side of the second system, and prepares the second system session for the UE according to the preset identification information.
  • the determining unit (not shown) is configured to determine whether the MBB switching is performed for the first system session, by using a predetermined first system session identifier and whether to perform a first-pass/down MBB correspondence.
  • the notification unit 02 when the decision result of the decision unit is YES, performs the process of notifying the UE to establish a second system session corresponding to the first system session being used in the two-pass mode.
  • the first system session identifier and the MBB correspondence are performed in the first system session establishment/modification process, and the first system core network side device is configured according to the session feature and the preset of the first system session.
  • the switching strategy is determined.
  • the session features include: S-NSSAI and/or DNN.
  • the apparatus may further include: an indication unit (not shown) disposed on the core device of the first system core network, configured to perform MBB indication information for the first system session when the first system session is established or modified. Send to the first system access network side device.
  • an indication unit (not shown) disposed on the core device of the first system core network, configured to perform MBB indication information for the first system session when the first system session is established or modified. Send to the first system access network side device.
  • the first determining unit 01 may be configured to be in the first system access network side device, and is further configured to carry the indication information when initiating a handover from the first system to the second system.
  • the first determining unit 01 is configured to be in the first system access network side device, and is further configured to determine, after the first system that triggers the UE is switched to the second system, pass the inter-system N26 interface to the second system core.
  • the network side device sends a handover request message that includes preset identifier information, and a preparation unit (not shown) that is disposed on the second core network side device, and is configured to perform second on the UE according to the preset identifier information. Preparation of the system session.
  • the first determining unit 01 may be configured to be configured by the first system core network side device, and further configured to determine, after the first system that triggers the UE is switched to the second system, to the second system by using the inter-system N26 interface.
  • the core network side device sends a handover request message including preset identification information.
  • the device further includes: a preparation unit (not shown) disposed on the core network side of the second system, configured to prepare the second system session for the UE according to the preset identification information.
  • the notification unit 02 may send a command including preset identification information to the UE to instruct the UE to establish a second system session corresponding to the first system session being used in the two-pass mode.
  • the establishing unit 05 is disposed on the core network side of the second system, and is responsible for establishing a second system session for the UE after receiving the connection request that is sent by the UE and including the preset identifier information.
  • the switching unit 03 can be configured on the core of the second system, specifically performing: switching the application data flow from the first system session to the corresponding second system session, and releasing the first system session.
  • the switching unit 03 may also be configured to be disposed on the first system core network side, configured to release the first system session after receiving the release session message sent by the UE, to switch the application data flow from the first system session to the corresponding Second system session.
  • the deregistration unit 06 which is disposed on the core network side of the second system, sends a handover complete message to the unified data management device after the handover unit 03 completes the handover from the first system session to the corresponding second system session, such as including the initial attached Initial.
  • the location of the attach parameter updates the Update Location message, triggering the unified data management device to perform deregistration for the UE in the first system.
  • the deregistration unit 06 is disposed on the core network side of the first system, and is configured to send a request to the unified data management device, such as clearing the Purge request, and triggering the unified data management device to perform deregistration for the UE in the first system.
  • the apparatus may further include a transmission unit (not shown) responsible for simultaneously transmitting data between the network side device and the UE on the first system session and the second system session before the switching unit 03 completes the handover. get on.
  • the data transmission between the network side device and the UE includes uplink data and downlink data, and performs Duplication transmission during data transmission.
  • the device can be used to implement switching from a 5G system to a 4G system, that is, the first system can be a 5G system, and the second system is a 4G system. It can also be used to switch from 4G system to 5G system, that is, the second system is a 4G system, and the first system is a 5G system.
  • FIG. 9 is a structural diagram of a registration device installed on a network side according to Embodiment 7 of the present application. As shown in FIG. 9, the device includes: a receiving unit 11, a second determining unit 12, and a response unit 13.
  • the receiving unit 11 is responsible for receiving the registration request or the location update request sent by the UE, where the registration request or the location update request carries the dual-pass capability information; wherein the dual-pass capability information indicates that the UE can establish the first system session with the dual-pass mode. Corresponding second system session.
  • the second determining unit 12 is responsible for determining whether to allow the UE to use the dual-pass capability and recording the determination result.
  • the device for inter-system handover shown in FIG. 6 can view the record when it is determined that the UE is triggered to switch from the first system to the second system. If the UE is allowed to use the dual-pass capability, the device shown in FIG. 6 continues to perform the handover; otherwise, Switching is performed by an existing intersystem switching device or other intersystem switching device.
  • the response unit 13 is responsible for returning to the UE whether the information enabling the UE to use the dual-pass capability is carried in the registration response or the location update response.
  • FIG. 10 is a structural diagram of an apparatus for inter-system handover set on a network side according to Embodiment 8 of the present application.
  • the apparatus may include: a sending unit 21 and a preparing unit 22.
  • the sending unit 21 is configured to send, after the first system access network side, the handover of the first system that triggers the UE to the second system, to the second system core network side, the handover request message that includes the preset identifier information.
  • the preparation unit 22 is disposed on the core network side of the second system, and is responsible for preparing the second system session for the UE according to the preset identification information.
  • the preparation may include a context mapping of mobility management and session management, and may also include an IP address assignment of the second system session.
  • the data filters, QoS parameters, and the like included in the second system session are the same as the data filters, QoS parameters, and the like included in the corresponding first system session. That is, the data stream transmitted in the first system session can also be transmitted on the second session, and can also have the same QoS guarantee.
  • the second system session is made to use the same IP address as its corresponding first system session.
  • FIG. 11 is a structural diagram of an apparatus for switching between systems provided on a network side according to Embodiment 9 of the present application.
  • the apparatus may include a sending unit 31, and may further include an establishing unit 32.
  • the sending unit 31 is disposed on the first system network side, and is responsible for sending a command including preset identification information to the UE, to instruct the UE to establish a second system session corresponding to the first system session being used in the dual-pass mode.
  • the first system network side device may be the first system core network side device, or the first system access network side device.
  • the above command including the preset identification information may include: a NAS message or an RRC reconfiguration message.
  • the establishing unit 32 is disposed on the core network side of the second system, and is responsible for establishing a second system session for the UE after receiving the connection request that is sent by the UE and including the preset identifier information.
  • the unit divisions performed in the above embodiments 6, 7, 8, and 9 are only schematic, and are a logical function division, and may be further divided in actual implementation.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. on. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • FIG. 12 is a structural diagram of an apparatus for inter-system handover provided in a UE according to Embodiment 10 of the present application.
  • the apparatus may include: a receiving unit 41, an establishing unit 42, and a switching unit 43.
  • the main functions of each component are as follows:
  • the receiving unit 41 is responsible for receiving the notification of the network side device. Specifically, the receiving unit 41 receives a command that is sent by the network side device and includes preset identifier information.
  • the establishing unit 42 is responsible for establishing a second system session corresponding to the first system session being used in the two-pass mode after the receiving unit 41 receives the notification from the network side device. Specifically, a connection request including preset identification information may be sent to the second system core network side device to establish a second system session.
  • the switching unit 43 is responsible for switching back to the single pass mode after the handover from the first system session to the corresponding second system session is completed.
  • the handover from the first system session to the corresponding second system session may be performed by the network side or by the UE.
  • the switching unit 43 is further configured to send a release session message to the first system core network side device to release the first system session and switch the application data flow from the first system session to the corresponding Two system sessions.
  • the apparatus may further include a transmission unit (not shown) responsible for simultaneously transmitting data between the UE and the network side device in the first system session and the second system before the switching unit 43 completes the handover.
  • a transmission unit responsible for simultaneously transmitting data between the UE and the network side device in the first system session and the second system before the switching unit 43 completes the handover.
  • the data transmission between the network side device and the UE includes uplink data and downlink data, and performs Duplication transmission during data transmission.
  • FIG. 13 is a structural diagram of a registration device installed in a UE according to Embodiment 11 of the present application. As shown in FIG. 13, the device may include a sending unit 51, and may further include a receiving unit 52.
  • the sending unit 51 is responsible for sending a registration request or a location update request to the network side device, and the registration request or the location update request carries the dual-pass capability information.
  • the dual-pass capability information indicates that the UE can establish a second system session corresponding to the first system session being used in the dual-pass mode.
  • the receiving unit 52 is responsible for receiving the registration response or the location update response returned by the network side device, and the registration response or the location update response includes information about whether the network side device allows the UE to use the dual-pass capability.
  • FIG. 14 is a structural diagram of an apparatus for inter-system handover provided in a UE according to Embodiment 12 of the present application.
  • the apparatus may include: a receiving unit 61 and an establishing unit 62.
  • the main functions of each component are as follows:
  • the receiving unit 61 is responsible for receiving a command that is sent by the first system network side device and includes preset identification information.
  • the establishing unit 62 is responsible for establishing a second system session corresponding to the first system session being used in a two-pass mode.
  • the first system network side device may be the first system core network side device, or the first system access network side device.
  • the above command including the preset identification information may adopt a NAS message or an RRC reconfiguration message.
  • the establishing unit 62 may send a connection request including preset identification information to the second system core network side device to establish a second system session.
  • the unit divisions performed in the eighth, ninth, and tenth embodiments are merely illustrative, and are a logical function division. In actual implementation, there may be another division manner.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • the foregoing method and apparatus provided by the embodiments of the present application may be implemented by one or more integrated circuits, such as a codec chip, or may be completed by a program to instruct related hardware, and the program may be stored in a computer readable storage medium.
  • Each unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. This application does not limit the combination of any particular form of hardware and software.
  • a device which includes:
  • One or more processors are One or more processors;
  • One or more programs the one or more programs being stored in the memory, executed by the one or more processors to:
  • the network side device determines to trigger a handover of the UE from the first system to the second system
  • the switching from the first system session to the corresponding second system session is performed to release the first system session.
  • the network side device receives a registration request sent by the UE, where the registration request carries the dual-pass capability information;
  • the dual-pass capability information indicates that the UE can establish a second system session corresponding to the first system session being used in the dual-pass mode.
  • the first system access network side device After the first system access network side device determines to trigger the handover of the first system of the UE to the second system, the first system access network side device sends a handover request message that includes preset identification information to the second system core network side device;
  • the second system core network side device prepares the second system session for the UE according to the preset identification information.
  • the first system network side device sends a command including preset identification information to the UE to instruct the UE to establish a second system session corresponding to the first system session being used in the two-pass mode.
  • the UE After receiving the notification of the network side device, the UE establishes a second system session corresponding to the first system session being used in a two-pass mode;
  • the mode is switched back to the single pass mode.
  • the UE sends a registration request to the network side device, where the registration request carries the dual-pass capability information;
  • the dual-pass capability information indicates that the UE can establish a second system session corresponding to the first system session being used in the dual-pass mode.
  • a two-pass mode is used to establish a second system session corresponding to the first system session being used.
  • the computer readable medium can be a computer readable signal medium or a computer readable storage medium.
  • the computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above.
  • a computer readable storage medium can be any tangible medium that can contain or store a program, which can be used by or in connection with an instruction execution system, apparatus or device.
  • a computer readable signal medium may include a data signal that is propagated in the baseband or as part of a carrier, carrying computer readable program code. Such propagated data signals can take a variety of forms including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the foregoing.
  • the computer readable signal medium can also be any computer readable medium other than a computer readable storage medium, which can transmit, propagate, or transport a program for use by or in connection with the instruction execution system, apparatus, or device. .

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Abstract

本申请提供了一种系统间切换的方法和装置,其中,方法包括:网络侧设备确定触发UE从第一系统向第二系统的切换;通知所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;执行从所述第一系统会话到对应的第二系统会话的切换,释放所述第一系统会话。这种在系统间会话切换之前保持切换前后两个系统的会话的方式,能够降低UE发生系统切换时所产生的时延,达到高可靠性的要求。

Description

一种系统间切换的方法和装置
本申请要求了申请日为2018年1月3日,申请号为PCT/CN2018/070243,发明名称为“一种系统间切换的方法和装置”,以及申请日为2018年2月9日,申请号为PCT/CN2018/075963,发明名称为“一种系统间切换的方法和装置”的PCT申请的优先权。
技术领域
本申请涉及无线通信技术领域,特别涉及一种系统间切换的方法和装置。
背景技术
随着无线网络通信技术的快速发展,无线通信网络已逐渐进入5G时代。5G蜂窝网络主要由三个域组成:5GC(核心网络)、NG-RAN(接入网络)和UE(用户设备)。
其中,NG-RAN存在gNB(5G网络中的基站)和eNB(4G网络中的基站)均接入5G的CN的场景,如图1中所示。当UE处于连接状态需要发生从5G系统到4G系统的切换时,NG-RAN的基站向AMF(接入移动性管理功能)发送Handover Required(切换要求)消息,从而触发系统间切换。
然而,目前在执行从5G到4G的系统间切换时,从释放5G的会话到建立4G的会话完成之间,需要一系列复杂的信令交互,会造成一定程度的业务延迟。另外,切换过程中的中断或数据错乱也在所难免。对于一些追求高可靠性、超低时延的业务来说,这种几百毫秒甚至秒级的时延是无法接受的。
发明内容
有鉴于此,本申请提供了一种系统间切换的方法和装置,以便于降低UE发生系统间切换时所产生的时延。
第一方面,本申请提供了一种系统间切换的方法,该方法包括:
网络侧设备确定触发UE从第一系统向第二系统的切换;
通知所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;
执行从所述第一系统会话到对应的第二系统会话的切换,释放所述第一系统会话。
根据本申请一具体实施方式,该方法还包括:
依据预先确定的第一系统会话标识和是否执行先通后断MBB的对应关系,确定是否针对所述第一系统会话执行MBB切换,如果是,则执行所述通知所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话的步骤。
根据本申请一具体实施方式,所述第一系统会话标识和是否执行MBB的对应关系是在所述第一系统会话建立/修改过程中,第一系统核心网侧设备根据所述第一系统会话的会话特征和预设的切换策略确定的。
根据本申请一具体实施方式,所述会话特征包括:S-NSSAI和/或DNN。
根据本申请一具体实施方式,第一系统核心网侧设备在第一系统会话建立或修改时,将针对所述第一系统会话进行MBB的指示信息发送给第一系统接入网侧设备;
所述第一系统接入网侧设备在发起从第一系统向第二系统的切换时,携带所述指示信息。
根据本申请一具体实施方式,第一系统核心网侧设备确定触发UE的第一系统向第二系统的切换后,通过系统间N26接口向第二系统核心网侧设备发送包含预设标识信息的切换要求消息;
所述第二系统核心网侧设备依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
根据本申请一具体实施方式,第一系统接入网侧设备确定触发UE的第一系统向第二系统的切换后,通过系统间N26接口向第二系统核心网侧设备发送包含预设标识信息的切换要求消息;
所述第二核心网侧设备依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
根据本申请一具体实施方式,在网络侧设备确定触发UE的第一系统向第二系统的切换后,该方法还包括:
针对所述UE进行第二系统会话的准备,所述准备包括:移动性管理和会话管理的上下文映射。
根据本申请一具体实施方式,所述准备还包括:为第二系统会话分配与对应的第一系统会话相同的IP地址。
根据本申请一具体实施方式,第一系统接入网侧设备确定触发UE的第一系统向第二系统的切换后,通过系统间N26接口向第二系统核心网侧设备发送包含预设标识信息的切换要求消息;
所述第二系统核心网侧设备依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
根据本申请一具体实施方式,通知所述UE建立与正在使用的第一系统会话相对应的第二系统会话包括:
向所述UE发送包含预设标识信息的命令,以指示所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
根据本申请一具体实施方式,该方法还包括:
第二系统核心网侧设备接收到所述UE发送的包含预设标识信息的连接请求后,为所述UE建立所述第二系统会话。
根据本申请一具体实施方式,执行从所述第一系统会话到对应的第二系统会话的切换,释放所述第一系统会话包括:
第二系统核心网侧设备将应用数据流从所述第一系统会话切换到对应的第二系统会话,释放所述第一系统会话。
根据本申请一具体实施方式,执行从所述第一系统会话到对应的第二系统会话的切换,释放所述第一系统会话包括:
第一核心网侧设备在接收到所述UE发送的释放会话消息后,释放所述第一系统会话,以将应用数据流从所述第一系统会话切换到对应的第二系统会话。
根据本申请一具体实施方式,该方法还包括:
从所述第一系统会话到对应的第二系统会话的切换后,第二系统核心网侧设备向统一数据管理设备发送切换完成消息,触发所述统一数据管理设备针对所述UE在第一系统进行去注册;或者,
第一系统核心网侧设备向统一数据管理设备发送请求,触发所述统一数据管理设备针对所述UE在第一系统进行去注册。
根据本申请一具体实施方式,所述切换完成消息包括:包含初始附着Initial attach参数的位置更新Update Location消息。
根据本申请一具体实施方式,该方法还包括:
网络侧设备接收到所述UE发送的携带双通能力信息的注册请求或位置更新请求后,确定是否允许所述UE使用双通能力,并记录确定结果;
在确定触发所述UE的第一系统向第二系统的切换时,依据所述记录判断所述UE具备双通能力时,继续执行所述通知所述UE建立与正在使用的第一系统会话相对应的第二系统会话的步骤。
根据本申请一具体实施方式,该方法还包括:
将是否允许所述UE使用双通能力的信息携带在注册响应或位置更新响应中返回给所述UE。
根据本申请一具体实施方式,在完成所述切换之前,网络侧设备与所述UE之间的数据传输同时在所述第一系统会话和第二系统会话上进行。
根据本申请一具体实施方式,所述第一系统为5G系统,所述第二系统为4G系统;或者,
所述第二系统为4G系统,所述第一系统为5G系统;或者,
所述第一系统和第二系统分别为同一核心网下的不同基站类型系统。
第二方面,本申请提供了一种注册方法,该方法包括:
网络侧设备接收UE发送的注册请求或位置更新请求,所述注册请求或位置更新请求携带双通能力信息;
其中所述双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
根据本申请一具体实施方式,该方法还包括:
确定是否允许所述UE使用双通能力,并记录确定结果。
根据本申请一具体实施方式,该方法还包括:
将是否允许所述UE使用双通能力的信息携带在注册响应或位置更新响应中返回给所述UE。
第三方面,本申请提供了一种系统间切换的方法,该方法包括:
第一系统接入网侧设备确定触发UE的第一系统向第二系统的切换后,向第二系统核心网侧设备发送包含预设标识信息的切换要求消息;
所述第二系统核心网侧设备依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
第四方面,本申请提供了一种系统间切换的方法,该方法包括:
第一系统网络侧设备向UE发送包含预设标识信息的命令,以指示所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
根据本申请一具体实施方式,所述第一系统网络侧设备包括:
第一系统核心网侧设备或第一系统接入网侧设备。
根据本申请一具体实施方式,所述包含预设标识信息的命令包括:NAS消息或RRC重配置消息。
根据本申请一具体实施方式,该方法还包括:
第二系统核心网侧设备接收到所述UE发送的包含预设标识信息的连接请求后,为所述UE建立所述第二系统会话。
第五方面,本申请提供了一种系统间切换的方法,该方法包括:
UE接收到网络侧设备的通知后,采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;
在从所述第一系统会话到对应的第二系统会话的切换完成后,切换回单通模式。
根据本申请一具体实施方式,所述UE接收到网络侧设备的通知包括:
所述UE接收到网络侧设备发送的包含预设标识信息的命令。
根据本申请一具体实施方式,所述采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话包括:
所述UE向第二系统核心网侧设备发送包含预设标识信息的连接请求,以建立所述第二系统会话。
根据本申请一具体实施方式,该方法还包括:
所述UE向第一系统核心网侧设备发送释放会话消息,以释放所述第一系统会 话并将应用数据流从所述第一系统会话切换到对应的第二系统会话。
根据本申请一具体实施方式,在完成所述切换之前,该方法还包括:
所述UE与网络侧设备之间的数据传输同时在所述第一系统会话和第二系统会话上进行。
根据本申请一具体实施方式,所述第一系统为5G系统,所述第二系统为4G系统;或者,
所述第二系统为4G系统,所述第一系统为5G系统。
第六方面,本申请还提供了一种注册方法,该方法包括:
UE向网络侧设备发送注册请求或位置更新请求,所述注册请求或位置更新请求携带双通能力信息;
其中所述双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
根据本申请一具体实施方式,该方法还包括:
接收所述网络侧设备返回的注册响应或位置更新响应,所述注册响应或位置更新响应包含所述网络侧设备是否允许所述UE使用双通能力的信息。
第七方面,本申请提供了一种系统间切换的方法,该方法包括:
UE接收第一系统网络侧设备发送的包含预设标识信息的命令;
采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
根据本申请一具体实施方式,所述第一系统网络侧设备包括:
第一系统核心网侧设备或第一系统接入网侧设备。
根据本申请一具体实施方式,所述包含预设标识信息的命令包括:NAS消息或RRC重配置消息。
根据本申请一具体实施方式,所述采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话包括:
所述UE向第二系统核心网侧设备发送包含预设标识信息的连接请求,以建立所述第二系统会话。
第八方面,本申请提供了一种系统间切换的装置,设置于网络侧,该装置包括:
第一确定单元,用于确定触发UE从第一系统向第二系统的切换;
通知单元,用于通知所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;
切换单元,用于执行从所述第一系统会话到对应的第二系统会话的切换,释放所述第一系统会话。
根据本申请一具体实施方式,该装置还包括:
决策单元,用于预先确定的第一系统会话标识和是否执行先通后断MBB的对应关系,确定是否针对所述第一系统会话执行MBB切换;
所述通知单元在所述决策单元的决策结果为是时,执行所述通知所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话的处理。
根据本申请一具体实施方式,所述第一系统会话标识和是否执行MBB的对应关系是在所述第一系统会话建立/修改过程中,第一系统核心网侧设备根据所述第一系统会话的会话特征和预设的切换策略确定的。
根据本申请一具体实施方式,所述会话特征包括:S-NSSAI和/或DNN。
根据本申请一具体实施方式,设置于第一系统核心网侧设备的指示单元,能够在第一系统会话建立或修改时,将针对所述第一系统会话进行MBB的指示信息发送给第一系统接入网侧设备;
所述第一确定单元设置于第一系统接入网侧设备,还用于在发起从第一系统 向第二系统的切换时,携带所述指示信息。
根据本申请一具体实施方式,所述第一确定单元设置于第一系统核心网侧设备,还用于确定触发UE的第一系统向第二系统的切换后,通过系统间N26接口向第二系统核心网侧设备发送包含预设标识信息的切换要求消息;
该装置还包括:设置于第二系统核心网侧的准备单元,用于依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
根据本申请一具体实施方式,所述第一确定单元设置于第一系统接入网侧设备,还用于确定触发UE的第一系统向第二系统的切换后,通过系统间N26接口向第二系统核心网侧设备发送包含预设标识信息的切换要求消息;
设置于第二核心网侧设备的准备单元,用于依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
根据本申请一具体实施方式,该装置还包括:
准备单元,用于在所述第一确定单元确定触发UE从第一系统向第二系统的切换后,针对所述UE进行第二系统会话的准备,所述准备包括:移动性管理和会话管理的上下文映射。
根据本申请一具体实施方式,所述准备还包括:为第二系统会话分配与对应的第一系统会话相同的IP地址。
根据本申请一具体实施方式,所述第一确定单元设置于第一系统接入网侧,所述第一确定单元,还用于通过系统间N26接口向第二系统核心网侧发送包含预设标识信息的切换要求消息;
所述准备单元设置于第二系统核心网侧,依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
根据本申请一具体实施方式,所述通知单元,具体用于向所述UE发送包含预设标识信息的命令,以指示所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
根据本申请一具体实施方式,该装置还包括:建立单元,设置于第二系统核心网侧,用于接收到所述UE发送的包含预设标识信息的连接请求后,为所述UE建立所述第二系统会话。
根据本申请一具体实施方式,所述切换单元设置于第二系统核心网侧,具体执行:
将应用数据流从所述第一系统会话切换到对应的第二系统会话的切换,释放所述第一系统会话。
根据本申请一具体实施方式,所述切换单元包括设置于第二系统核心网侧的单元和设置于第一系统核心网侧的单元;
其中,设置于第二系统核心网侧的单元,用于通知所述UE将应用数据流从所述第一系统会话切换到对应的第二系统会话;
设置于第一系统核心网侧的单元在接收到所述UE发送的释放会话消息后,释放所述第一系统会话,以将应用数据流从所述第一系统会话切换到对应的第二系统会话。
根据本申请一具体实施方式,该装置还包括:
设置于第二系统核心网侧的去注册单元,用于在所述切换单元完成从所述第一系统会话到对应的第二系统会话的切换后,向统一数据管理设备发送切换完成消息,触发所述统一数据管理设备针对所述UE在第一系统进行去注册;或者,
设置于第一系统核心网侧的去注册单元,用于向统一数据管理设备发送请求,触发所述统一数据管理设备针对所述UE在第一系统进行去注册。
根据本申请一具体实施方式,所述切换完成消息包括:包含初始附着Initial  attach参数的位置更新Update Location消息。
根据本申请一具体实施方式,该装置还包括:
传输单元,用于在所述切换单元完成所述切换之前,将网络侧设备与所述UE之间的数据传输同时在所述第一系统会话和第二系统会话上进行。
根据本申请一具体实施方式,所述第一系统为5G系统,所述第二系统为4G系统;或者,
所述第二系统为4G系统,所述第一系统为5G系统;或者,
所述第一系统和第二系统分别为同一核心网下的不同基站类型系统。
第九方面,本申请提供了一种注册装置,设置于网络侧,该装置包括:
接收单元,用于接收UE发送的注册请求或位置更新请求,所述注册请求或位置更新请求携带双通能力信息;
其中所述双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
根据本申请一具体实施方式,该装置还包括:
第二确定单元,用于确定是否允许所述UE使用双通能力,并记录确定结果。
根据本申请一具体实施方式,该装置还包括:
响应单元,用于将是否允许所述UE使用双通能力的信息携带在注册响应或位置更新响应中返回给所述UE。
第十方面,本申请提供了一种系统间切换的装置,该装置包括:
发送单元,用于在第一系统接入网侧确定触发UE的第一系统向第二系统的切换后,向第二系统核心网侧发送包含预设标识信息的切换要求消息;
准备单元,设置于第二系统核心网侧,用于依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
第十一方面,本申请提供了一种系统间切换的装置,该装置包括:
发送单元,设置于第一系统网络侧,用于向UE发送包含预设标识信息的命令,以指示所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
根据本申请一具体实施方式,所述第一系统网络侧设备包括:
第一系统核心网侧设备或第一系统接入网侧设备。
根据本申请一具体实施方式,所述包含预设标识信息的命令包括:NAS消息或RRC重配置消息。
根据本申请一具体实施方式,该装置包括:
建立单元,设置于第二系统核心网侧,用于接收到所述UE发送的包含预设标识信息的连接请求后,为所述UE建立所述第二系统会话。
第十二方面,本申请还提供了一种系统间切换的装置,设置于UE,该装置包括:
接收单元,用于接收网络侧设备的通知;
建立单元,用于在所述接收单元接收到网络侧设备的通知后,采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;
切换单元,用于在从所述第一系统会话到对应的第二系统会话的切换完成后,切换回单通模式。
根据本申请一具体实施方式,所述接收单元,具体执行:
接收网络侧设备发送的包含预设标识信息的命令。
根据本申请一具体实施方式,所述建立单元,具体执行:
向第二系统核心网侧设备发送包含预设标识信息的连接请求,以建立所述第二系统会话。
根据本申请一具体实施方式,所述切换单元,还用于向第一系统核心网侧设备发送释放会话消息,以释放所述第一系统会话并将应用数据流从所述第一系统会话切换到对应的第二系统会话。
根据本申请一具体实施方式,该装置还包括:
传输单元,用于在所述切换单元完成所述切换之前,将所述UE与网络侧设备之间的数据传输同时在所述第一系统会话和第二系统会话上进行。
第十三方面,本申请提供了一种注册装置,设置于UE,该装置包括:
发送单元,用于向网络侧设备发送注册请求或位置更新请求,所述注册请求或位置更新请求携带双通能力信息;
其中所述双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
根据本申请一具体实施方式,该装置还包括:
接收单元,用于接收所述网络侧设备返回的注册响应或位置更新响应,所述注册响应或位置更新响应包含所述网络侧设备是否允许所述UE使用双通能力的信息。
第十四方面,本申请提供了一种系统间切换的装置,该装置包括:
接收单元,用于接收第一系统网络侧设备发送的包含预设标识信息的命令;
建立单元,用于采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
根据本申请一具体实施方式,所述第一系统网络侧设备包括:
第一系统核心网侧设备或第一系统接入网侧设备。
根据本申请一具体实施方式,所述包含预设标识信息的命令包括:NAS消息或RRC重配置消息。
根据本申请一具体实施方式,所述建立单元,具体执行:
向第二系统核心网侧设备发送包含预设标识信息的连接请求,以建立所述第二系统会话。
第十六方面,本申请还提供了一种设备,包括
一个或者多个处理器;
存储器;
一个或者多个程序,所述一个或者多个程序存储在所述存储器中,被所述一个或者多个处理器执行上述方法中的操作。
第十七方面,本申请还提供了一种包含计算机可执行指令的存储介质,所述计算机可执行指令在由计算机处理器执行时用于执行上述方法中的操作。
由以上技术方案可以看出,本申请中网络侧设备在确定触发UE从第一系统向第二系统的切换后,通知UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话,执行第一系统会话到对应的第二系统会话的切换,释放第一系统会话。这种在系统间会话切换之前保持切换前后两个系统的会话的方式,能够降低UE发生系统切换时所产生的时延,达到高可靠性的要求。
附图说明
图1为本申请实施例提供的一个场景示意图;
图2为本申请实施例一提供的系统间切换的方法流程图;
图3为本申请实施例二提供的系统切换的方法流程图;
图4为本申请实施例三提供的网络注册的方法流程图;
图5a和图5b为本申请实施例提供的UE处于各阶段的状态示意图;
图6为本发明实施例四提供的系统件切换方法流程图;
图7为实施例五提供的系统切换的方法流程图;
图8为本申请实施例六提供的设置于网络侧的系统间切换的装置结构图;
图9为本申请实施例七提供的设置于网络侧的注册装置的结构图;
图10为本申请实施例八提供的设置于网络侧的系统间切换的装置结构图;
图11为本申请实施例九提供的设置于网络侧的系统间切换的装置结构图;
图12为本申请实施例十提供的设置于UE的系统间切换的装置结构图;
图13为本申请实施例十一提供的设置于UE的注册装置结构图;
图14为本申请实施例十二提供的设置于UE的系统间切换的装置结构图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚,下面结合附图和具体实施例对本申请进行详细描述。
本申请的核心思想在于,网络侧确定触发UE从第一系统向第二系统的切换后,通知UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;执行从第一系统会话到对应的第二系统会话的切换,释放第一系统会话。
本申请可以用于实现两个通信系统之间的切换,例如实现从5G系统到4G系统的切换,再例如可以实现从4G系统到5G系统的切换。在后续实施例一和二中以5G系统到4G系统的切换为例。再例如,实现同一核心网下不同基站类型的系统间切换,在后续实施例四和五中以5G核心网下从NR基站系统向LTE基站系统切换。
实施例一、
图2为本申请实施例一提供的系统间切换的方法流程图,如图2中所示,该方法可以包括以下步骤:
在101中,5G接入网侧设备确定触发UE从5G系统向4G系统的切换。
在102中,5G接入网侧设备向4G核心网侧设备发送Handover Required(切换要求)消息,该Handover Required消息中携带预设标识信息。
本步骤中,NG-RAN确定触发切换后,可以通过系统间接口(N26接口)向AMF(接入移动性管理功能)发送预设标识信息的Handover Required消息,例如携带Make Before Break(先通后断)标识。
在103中,4G核心网侧设备进行4G系统会话的准备,该准备可以包括移动性管理和会话管理的上下文映射,还可以包括4G系统会话的IP地址分配。
具体地,AMF接收到携带Make Before Break标识的Handover Required消息后,可以向4G核心网的PGW(公共网络网关)发送会话管理上下文映射的请求(SM Context Request),由PGW完成会话管理的上下文映射和IP地址分配后,向AMF返回响应消息(SM Context Response);再由AMF向MME(移动性管理实体)发送Relocation Request,MME向SGW(服务网关)发送建立会话请求(Create Session Request),SGW向MME返回响应消息(Create Session Response);MME向E-UTRAN(4G接入网侧设备)发送切换请求(Handover Request),由E-UTRAN返回响应消息(Handover RequestAck);然后MME向AMF返回Relocation Response。上述过程中,不需要建立数据转发通道(Data forwarding tunnel)。
其中,在进行会话管理的上下文映射时,会使得第二系统会话所包含的数据过滤器、QoS参数等与对应的第一系统会话所包含的数据过滤器、QoS参数等相同。即在第一系统会话传输的数据流也同样可以在第二会话上传输,同时还可以具备相同的QoS保障。
PGW在为4G系统的会话(PDN Connection)分配的IP地址与对应的5G系统的会话(PDU Session)的IP地址相同。需要说明的是,若UE在5G系统中存在一个PDU Session,则会针对该PDU Session建立对应的一个PDN Connection, 两者IP地址相同。若UE在5G系统中多个正在使用的PDU Session,则会针对各PDU Session分别建立对应的PDN Connection,且两两对应会话的IP地址相同。
在104中,4G核心网侧设备向UE发送包含预设标识信息的命令。
本步骤中,可以由AMF向UE发送包含Make Before Break标识的命令,也可以由NG-RAN向UE发送包含Make Before Break标识的命令(这种情况下,NG-RAN可以在接收到AMF发送的Handover Command之后执行)。其中,上述命令可以是NAS消息或RRC重配置消息。
在105中,UE在双通模式下向4G核心网侧设备发送包含预设标识信息的连接请求。
UE通常处于单通模式,即仅使用或驻留于一种通信系统的模式。UE接收到包含Make Before Break标识的命令,依据Make Before Break标识获知需要采用双通模式建立4G系统会话。则UE可以切换至双通模式,向MME发送包含Make Before Break标识的连接请求,该连接请求可以是附着(Attach)消息,也可以是切换通知(Handover notify)消息。
本发明实施例中,双通模式(DR,Dual Registration)指的是能够同时使用或驻留于两种通信系统的模式,需要在两种通信系统注册。
在106中,4G核心网侧设备为UE建立4G系统会话。
本步骤中,MME可以请求PGW依据之前4G核心网所做的准备为UE建立与其正在使用的PDU Session对应的PDN Connection。另外,MME识别出Make Before Break标识后,不会立即释放PDU Session,而是同时保持PDU Session和PDN Connection。
在107中,4G核心网侧设备执行从5G系统会话到对应的4G系统会话的切换,释放5G系统会话。
PGW在建立好PDN Connection后,进行Path Switch(路径切换),将应用数据流从PDU Session上切换到PDN Connection上,并释放PDU Session。
另外,为了达到更高的可靠性,网络侧设备与UE之间的数据传输可以同时在PDU Session和PDN Connection上进行。即PGW对下行数据进行Duplication(复制)传输,将下行数据在PDU Session上传输的同时,复制相同数据在PDN Connection上传输。UE对上行数据也进行Duplication传输,将上行数据在PDU Session上传输的同时,复制相同数据在PDN Connection上传输。
在108中,4G核心网侧设备执行UE在5G系统的去注册。
本步骤中,PGW完成Path Switch后,可以通知MME;然后由MME向统一数据管理设备(诸如HSS/UDM)发送切换完成消息,诸如更新位置(Update location)消息,该Update location消息中包含初始附着(Initial attach)参数,从而触发HSS/UDM对5G系统执行Cancel location消息。
另外,PGW完成Path Switch后,可以通知MME,再由MME通知UE,UE就可以从双通模式切换回单通模式。
在本实施例中,可以预先在UDM(签约信息数据库)和/或PCF(策略控制网元)中基于用户粒度配置MBB切换策略,也可以预先在SMF中静态配置MBB切换策略。
其中MBB切换策略可以是基于预设会话特征确定是否针对会话执行MMB切换的策略。其中,会话特征可以包括但不限于:S-NSSAI(Single Network Slice S election Assistance information,但网络切片选择辅助信息)和/或DNN。
举个例子,配置的策略可以如下:
S-NSSAI-1,DNN-1时,执行MBB切换;
S-NSSAI-2,DNN-1时,不执行MBB切换;
S-NSSAI-2,DNN-3时,执行MBB切换;
其他情况时,不执行MBB切换。
在本实施例中,在5G系统会话建立或修改时,SMF依据本地配置的策略或者依据从UDM/PCF获取的策略,并根据该策略和5G系统会话的特征信息确定该5G系统会话是否执行MBB切换,并可以将该5G系统会话的ID与是否执行MBB切换的对应关系存储于本地。
在上述流程中,SMF可以在5G系统会话建立或修改后,将该5G系统会话执行MBB切换的指示信息发送给NG-RAN,NR-RAN就执行上述步骤102,即向4G核心网侧设备发送携带MBB标识的Handover Required消息。
除此之外,还存在另外一种实现方式,在上述102中,NR-RAN可以按照现有方式发送Handover Required消息,其中不携带MBB标识,但携带有5G系统会话的ID信息。AMF接收到Handover Required消息后,从SMF获取是否针对该5G系统会话执行MBB切换的信息(例如通过Nsf_RDUSesion_ContextRSP消息获取SMF返回的是否针对该5G系统会话执行MBB切换的信息),如果是,则AMF接续执行上述步骤104。
需要说明的是,上述MBB策略的机制在后续实施例中同样适用。
实施例二、
图3为实施例二提供的系统切换的方法流程图,本实施例的执行流程与实施例一的区别在于切换和去注册的执行。如图3所示,该方法可以包括以下步骤:
步骤201~206与实施例一中步骤101~106相同,不做赘述。
在207中,4G核心网侧设备通知UE完成从5G系统会话到对应4G系统会话的切换。
PGW在建立好PDN Connection后,通知MME,由MME进一步通知UE进行Path Switch(路径切换)。
另外,为了达到更高的可靠性,网络侧设备与UE之间的数据传输可以同时在PDU Session和PDN Connection上进行。即PGW对下行数据进行Duplication(复制)传输,将下行数据在PDU Session上传输的同时,复制相同数据在PDN Connection上传输。UE对上行数据也进行Duplication传输,将上行数据在PDU Session上传输的同时,复制相同数据在PDN Connection上传输。
在208中,UE向5G核心网侧设备发送释放会话消息。
UE可以通过NAS消息通知AMF释放5G系统会话。
在209中,5G核心网侧设备释放5G系统会话。
5G核心网侧设备释放PDU Session的同时,应用数据流从PDU Session上切换到对应的PDN Connection上。UE完成切换后可以从双通模式切换回单通模式。
在210中,5G核心网侧设备向统一数据管理设备(诸如HSS/UDM)发送请求,触发统一数据管理设备针对UE在5G系统进行去注册。
本步骤中,AMF释放5G系统会话的同时,或者之后,可以向HSS/UDM发送Purge请求,删除UE在5G系统的注册信息。
实施例三、
在上述实施例一和实施例二所述的过程之前,存在UE向网络注册的过程,可以在此过程之中,对UE的双通能力进行注册。如图4所示,该过程可以包括以下步骤:
在301中,UE向网络侧设备发送注册请求,该注册请求携带双通能力信息。
在实施例一和实施例二中,UE在向5G系统进行注册时,可以在向5G系统的网络侧设备发送的Registration Request中携带双通能力信息,该双通能力信息指示UE能够采用双通模式建立与正在使用的5G系统会话对应的4G系统会话。
该Registration Request由UE发送给NG-RAN,可以进一步再由NG-RAN发送给AMF。
在302中,网络侧设备确定是否允许UE使用双通能力,并记录确定结果。
在本步骤中,NG-RAN可以确定是否允许UE使用双通能力,并记录确定结果。在上述实施例一和实施例二中,NG-RAN在确定触发UE从5G系统切换至4G系统时,查看记录,如果是允许UE使用双通能力,则继续按照实施例一或实施例二中的流程执行;否则,可以按照现有流程或其他流程执行切换。
在303中,网络侧设备将确定结果携带在注册响应中返回给UE。
本步骤中,NG-RAN可以将是否允许用户使用双通能力的信息包含在Registration Accept消息中返回给UE。
另外,本实施例中,除了可以采用注册请求携带双通能力信息之外,还可以采用位置更新请求来携带UE的双通能力信息;网络侧设备可以将是否允许用户使用双通能力的信息包含在位置更新响应消息中返回给UE。
从上述实施例可以看出,对于UE而言,采用的是“先通后断”(Make Before Break)方式,所处的模式可以如图5a中所示。在切换前,处于单通模式,采用5G系统会话。在切换过程中,处于双通模式,同时保持5G系统会话和4G系统会话。切换完成后,切换回单通模式,5G系统会话被释放,仅采用4G系统会话。
上述实施例中是以从5G系统切换至4G系统为例进行的描述,但本申请所提供的方法同样适用于从4G系统切换至5G系统,具体实现过程类似,涉及到的5G系统的设备与4G系统的设备进行对调即可。
实施例四、
图6为本发明实施例四提供的系统切换方法流程图,本实施例中以从5G核心网中的NR基站系统切换至LTE基站系统为例。对于UE而言,其模式如图5b中所示,在切换前处于单通模式,采用经由NR基站的系统会话,在切换过程中,处于双通模式,同时保持经由NR基站的系统会话和经由LTE基站的系统会话。切换完成后,切换回单通模式,经由NR基站的系统会话被释放,仅采用经由LTE基站的系统会话。如图6所示,该方法可以包括以下步骤:
在601中,5G核心网中的NR基站确定触发UE从该NR基站系统向本5G核心网中的LTE基站系统切换。
在602中,NR基站向5G核心网侧设备发送Handover Required(切换要求)消息,该Handover Required消息中携带预设标识信息。
NR基站确定触发切换后,可以通过系统间接口(N26接口)向AMF发送预设标识信息的Handover Required消息,例如携带Make Before Break标识。
在603中,5G核心网侧设备向UE发送包含预设标识信息的命令。
本步骤中,可以由AMF向UE发送包含Make Before Break标识的命令,也可以由NG-RAN向UE发送包含Make Before Break标识的命令(这种情况下,NG-RAN可以在接收到AMF发送的Handover Command之后执行)。其中,上述命令可以是NAS消息或RRC重配置消息。
在604中,UE在双通模式下向5G核心网下的LTE基站发送包含预设标识信息的连接请求。
UE通常处于单通模式,UE接收到包含Make Before Break标识的命令,依据Make Before Break标识获知需要采用双通模式建立与目标系统的会话,则UE可以切换至双通模式,向5G核心网下的LTE基站发送包含Make Before Break标识的连接请求。
在605中,5G核心网下的LTE基站向5G核心网侧设备发送包含预设标识信 息的连接请求。
在606中,5G核心网侧设备为UE建立经由LTE基站的系统会话。
LTE基站向AMF发送包含Make Before Break标识的连接请求,AMF可以请求PGW为UE建立与正在使用的第一PDU Session对应的第二PDU Session。其中第一PDU Session经由NR基站,第二PDU Session经由LTE基站,两者采用不同的端口号。另外,AMF识别出Make Before Break标识后,不会立即释放第一PDU Session,而是同时保持第一PDU Session和第二PDU Session。
在607中,5G核心网侧设备执行从经由NR基站的系统会话到对应的经由LTE基站的系统会话的切换,释放经由NR基站的系统会话。
PGW在建立好第二PDU Session后,进行Path Switch,将应用数据流从第一PDU Session上切换到第二PDU Session上,并释放第一PDU Session。
另外,为了达到更高的可靠性,网络侧设备与UE之间的数据传输可以同时在第一PDU Session和第二PDU Session上进行。即PGW对下行数据进行Duplication(复制)传输,将下行数据在第一PDU Session上传输的同时,复制相同数据在第二PDU Session上传输。UE对上行数据也进行Duplication传输,将上行数据在第一PDU Session上传输的同时,复制相同数据在第二PDU Session上传输。
在608中,5G核心网侧设备执行UE在LTE基站系统的去注册。
在本步骤中,PGW完成Path Switch后,可以通知AMF,由AMF向统一数据管理设备(诸如HSS/UDM)发送切换完成消息,诸如更新位置(Update location)消息,该Update location消息中包含初始附着(Initial attach)参数,从而触发HSS/UDM向AMF发送Cancel location消息。
另外,PGW完成Path Switch后,可以通知AMF,再由AMF通知UE,UE就可以从双通模式切换回单通模式。
实施例五、
图7为实施例五提供的系统切换的方法流程图,本实施例的执行流程与实施例四的区别在于切换和去注册的过程。如图7所示,该方法可以包括以下步骤:
步骤701~706与实施例四中步骤601~606相同,不做赘述。
在707中,5G核心网侧设备通知UE完成从经由NR基站的系统会话到对应经由LTE基站的系统会话的切换。
PGW在建立好第二PDU Session后,通知AMF,由AMF进一步通知UE进行Path Switch(路径切换)。
另外,为了达到更高的可靠性,网络侧设备与UE之间的数据传输可以同时在第一PDU Session和第二PDU Session上进行。即PGW对下行数据进行Duplication(复制)传输,将下行数据在第一PDU Session上传输的同时,复制相同数据在第二PDU Session上传输。UE对上行数据也进行Duplication传输,将上行数据在第一PDU Session上传输的同时,复制相同数据在第二PDU Session上传输。
在708中,UE向5G核心网侧设备发送释放会话消息。
UE可以通过NAS消息通知AMF释放经由NR基站的系统会话。
在709中,5G核心网侧设备释放经由NR基站的系统会话。
5G核心网侧设备释放第一PDU Session的同时,应用数据流从第一PDU Session上切换到对应的第二PDU Session上。UE完成切换后可以从双通模式切换回单通模式。
在710中,5G核心网侧设备向统一数据管理设备(诸如HSS/UDM)发送请求,触发统一数据管理设备针对UE在NR基站系统进行去注册。
本步骤中,AMF释放经由NR基站的系统会话的同时,或者之后,可以向HSS/UDM发送Purge请求,删除UE在NR基站系统的注册信息。
适用于实施例四和五的、对UE的双通能力进行注册的过程可以参考实施例三,其基本实现流程相同,在此不做赘述。
以上是对本申请提供的方法进行的描述,下面结合实施例对本申请提供的装置进行描述。
实施例六、
图8为本申请实施例六提供的设置于网络侧的系统间切换的装置结构图,如图8所示,该装置可以包括:第一确定单元01、通知单元02和切换单元03;还可以进一步包括准备单元04、建立单元05和去注册单元06。其中,各组成单元的主要功能如下:
第一确定单元01负责确定触发UE从第一系统向第二系统的切换。
通知单元02负责通知UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
切换单元03负责执行从第一系统会话到对应的第二系统会话的切换,释放第一系统会话。
准备单元04负责在第一确定单元01确定触发UE从第一系统向第二系统的切换后,针对UE进行第二系统会话的准备,准备包括:移动性管理和会话管理的上下文映射,该准备还可以包括:为第二系统会话分配与对应的第一系统会话相同的IP地址。需要说明的是,若UE在第一系统中存在一个会话,则会针对该会话建立对应的第二系统会话,两者IP地址相同。若UE在第一系统中多个正在使用的会话,则会针对各正在使用的会话分别建立对应的第二系统会话,且两两对应会话的IP地址相同。
其中,在进行会话管理的上下文映射时,会使得第二系统会话所包含的数据过滤器、QoS参数等与对应的第一系统会话所包含的数据过滤器、QoS参数等相同。即在第一系统会话传输的数据流也同样可以在第二会话上传输,同时还可以具备相同的QoS保障。
其中,第一确定单元01可以设置于第一系统接入网侧,还可以用于通过系统间接口(N26)向第二系统核心网侧发送包含预设标识信息的切换要求消息。准备单元04可以设置于第二系统核心网侧,依据预设标识信息,针对UE进行第二系统会话的准备。
决策单元(图中未示出),用于预先确定的第一系统会话标识和是否执行先通后断MBB的对应关系,确定是否针对所述第一系统会话执行MBB切换。
通知单元02在决策单元的决策结果为是时,执行所述通知所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话的处理。
其中,所述第一系统会话标识和是否执行MBB的对应关系是在所述第一系统会话建立/修改过程中,第一系统核心网侧设备根据所述第一系统会话的会话特征和预设的切换策略确定的。
其中,会话特征包括:S-NSSAI和/或DNN。
该装置还可以包括:设置于第一系统核心网侧设备的指示单元(图中未示出),能够在第一系统会话建立或修改时,将针对所述第一系统会话进行MBB的指示信息发送给第一系统接入网侧设备。
此时,第一确定单元01可以设置于第一系统接入网侧设备,还用于在发起从第一系统向第二系统的切换时,携带所述指示信息。
作为一种实施方式,第一确定单元01设置于第一系统接入网侧设备,还用于确定触发UE的第一系统向第二系统的切换后,通过系统间N26接口向第二系统 核心网侧设备发送包含预设标识信息的切换要求消息;设置于第二核心网侧设备的准备单元(图中未示出),用于依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
作为另一种实施方式,第一确定单元01可以设置于第一系统核心网侧设备,还用于确定触发UE的第一系统向第二系统的切换后,通过系统间N26接口向第二系统核心网侧设备发送包含预设标识信息的切换要求消息。此时,该装置还包括:设置于第二系统核心网侧的准备单元(图中未示出),用于依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
具体地,通知单元02可以向UE发送包含预设标识信息的命令,以指示UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
建立单元05设置于第二系统核心网侧,负责接收到UE发送的包含预设标识信息的连接请求后,为UE建立第二系统会话。
切换单元03可以设置于第二系统核心网侧,具体执行:将应用数据流从第一系统会话切换到对应的第二系统会话,释放第一系统会话。
切换单元03也可以包括设置于第一系统核心网侧,用于在接收到UE发送的释放会话消息后,释放第一系统会话,以将应用数据流从所述第一系统会话切换到对应的第二系统会话。
设置于第二系统核心网侧的去注册单元06,在切换单元03完成从第一系统会话到对应的第二系统会话的切换后,向统一数据管理设备发送切换完成消息,诸如包含初始附着Initial attach参数的位置更新Update Location消息,触发所述统一数据管理设备针对所述UE在第一系统进行去注册。
设置于第一系统核心网侧的去注册单元06,用于向统一数据管理设备发送请求,诸如清除Purge请求,触发所述统一数据管理设备针对所述UE在第一系统进行去注册。
该装置还可以包括传输单元(图中未示出),负责在切换单元03完成上述切换之前,将网络侧设备与UE之间的数据传输同时在所述第一系统会话和第二系统会话上进行。其中,网络侧设备与UE之间的数据传输包括上行数据和下行数据,在数据传输时进行Duplication传输。
该装置中可以用于实现从5G系统到4G系统的切换,即第一系统可以为5G系统,第二系统为4G系统。也可以用于实现从4G系统到5G系统的切换,即第二系统为4G系统,第一系统为5G系统。
实施例七、
图9为本申请实施例七提供的设置于网络侧的注册装置的结构图,如图9所示,该装置包括:接收单元11、第二确定单元12和响应单元13。
其中,接收单元11负责接收UE发送的注册请求或位置更新请求,注册请求或位置更新请求携带双通能力信息;其中双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
第二确定单元12负责确定是否允许UE使用双通能力,并记录确定结果。图6所示系统间切换的装置在确定触发UE从第一系统切换至第二系统时,可以查看记录,如果是允许UE使用双通能力,则图6所示装置继续执行切换;否则,可以由现有系统间切换装置或其他系统间切换装置执行切换。
响应单元13负责将是否允许UE使用双通能力的信息携带在注册响应或位置更新响应中返回给UE。
实施例八、
图10为本申请实施例八提供的设置于网络侧的系统间切换的装置结构图,该装置可以包括:发送单元21和准备单元22。
发送单元21负责在第一系统接入网侧确定触发UE的第一系统向第二系统的切换后,向第二系统核心网侧发送包含预设标识信息的切换要求消息。
准备单元22设置于第二系统核心网侧,负责依据预设标识信息,针对UE进行第二系统会话的准备。该准备可以包括移动性管理和会话管理的上下文映射,还可以包括第二系统会话的IP地址分配。
其中,在进行会话管理的上下文映射时,会使得第二系统会话所包含的数据过滤器、QoS参数等与对应的第一系统会话所包含的数据过滤器、QoS参数等相同。即在第一系统会话传输的数据流也同样可以在第二会话上传输,同时还可以具备相同的QoS保障。
在进行IP地址分配时,使得第二系统会话与其对应的第一系统会话采用相同的IP地址。
实施例九、
图11为本申请实施例九提供的设置于网络侧的系统间切换的装置结构图,如图11所示,该装置可以包括发送单元31,还可以包括建立单元32。
发送单元31设置于第一系统网络侧,负责向UE发送包含预设标识信息的命令,以指示UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
其中,上述第一系统网络侧设备可以是第一系统核心网侧设备,也可以是第一系统接入网侧设备。
上述包含预设标识信息的命令可以包括:NAS消息或RRC重配置消息。
建立单元32设置于第二系统核心网侧,负责接收到UE发送的包含预设标识信息的连接请求后,为UE建立第二系统会话。
上述实施例六、七、八和九所进行的单元划分仅仅是示意性的,是一种逻辑功能划分,实际实现时可以有另外的划分方式。另外,所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
实施例十、
图12为本申请实施例十提供的设置于UE的系统间切换的装置结构图,如图12所示,该装置可以包括:接收单元41、建立单元42和切换单元43。其中各组成单元的主要功能如下:
接收单元41负责接收网络侧设备的通知。具体地,接收单元41接收网络侧设备发送的包含预设标识信息的命令。
建立单元42负责在接收单元41接收到网络侧设备的通知后,采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。具体地,可以向第二系统核心网侧设备发送包含预设标识信息的连接请求,以建立第二系统会话。
切换单元43负责在从第一系统会话到对应的第二系统会话的切换完成后,切换回单通模式。
从第一系统会话到对应的第二系统会话的切换可以由网络侧执行,也可以由UE执行。当由UE执行时,切换单元43还用于向第一系统核心网侧设备发送释放会话消息,以释放所述第一系统会话并将应用数据流从所述第一系统会话切换到对应的第二系统会话。
另外,该装置还可以包括传输单元(图中未示出),负责在切换单元43完成上述切换之前,将UE与网络侧设备之间的数据传输同时在所述第一系统会话和第二系统会话上进行。其中,网络侧设备与UE之间的数据传输包括上行数据和下行数据,在数据传输时进行Duplication传输。
实施例十一、
图13为本申请实施例十一提供的设置于UE的注册装置结构图,如图13所示,该装置可以包括发送单元51,还可以包括接收单元52。
其中,发送单元51负责向网络侧设备发送注册请求或位置更新请求,注册请求或位置更新请求携带双通能力信息。其中双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
接收单元52负责接收网络侧设备返回的注册响应或位置更新响应,注册响应或位置更新响应包含网络侧设备是否允许UE使用双通能力的信息。
实施例十二、
图14为本申请实施例十二提供的设置于UE的系统间切换的装置结构图,如图14所示,该装置可以包括:接收单元61和建立单元62。其中各组成单元的主要功能如下:
接收单元61负责接收第一系统网络侧设备发送的包含预设标识信息的命令。
建立单元62负责采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
其中,上述第一系统网络侧设备可以是第一系统核心网侧设备,也可以是第一系统接入网侧设备。
上述包含预设标识信息的命令可以采用NAS消息或RRC重配置消息。
具体地,建立单元62可以向第二系统核心网侧设备发送包含预设标识信息的连接请求,以建立第二系统会话。
上述实施例八、九、十所进行的单元划分仅仅是示意性的,是一种逻辑功能划分,实际实现时可以有另外的划分方式。另外,所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外,本申请实施例提供的上述方法和装置可以以一个或多个集成电路例如编解码芯片的方式实现,也可以通过程序来指令相关硬件来完成,所述程序可以存储于计算机可读存储介质中。上述实施例中的各单元可以采用硬件的形式实现,也可以采用软件功能模块的形式实现。本申请不限制任何特定形式的硬件和软件的结合。
例如可以通过设备实现,该设备包括:
一个或者多个处理器;
存储器;
一个或者多个程序,所述一个或者多个程序存储在所述存储器中,被所述一个或者多个处理器执行以实现如下操作:
网络侧设备确定触发UE从第一系统向第二系统的切换;
通知所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;
执行从所述第一系统会话到对应的第二系统会话的切换,释放所述第一系统会话。
再例如,被所述一个或者多个处理器执行以实现如下操作:
网络侧设备接收UE发送的注册请求,所述注册请求携带双通能力信息;
其中所述双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
再例如,被所述一个或者多个处理器执行以实现如下操作:
第一系统接入网侧设备确定触发UE的第一系统向第二系统的切换后,向第二 系统核心网侧设备发送包含预设标识信息的切换要求消息;
所述第二系统核心网侧设备依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
再例如,被所述一个或者多个处理器执行以实现如下操作:
第一系统网络侧设备向UE发送包含预设标识信息的命令,以指示所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
再例如,被所述一个或者多个处理器执行以实现如下操作:
UE接收到网络侧设备的通知后,采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;
在从所述第一系统会话到对应的第二系统会话的切换完成后,切换回单通模式。
再例如,被所述一个或者多个处理器执行以实现如下操作:
UE向网络侧设备发送注册请求,所述注册请求携带双通能力信息;
其中所述双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
再例如,被所述一个或者多个处理器执行以实现如下操作:
UE接收第一系统网络侧设备发送的包含预设标识信息的命令;
采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
另外,随着时间、技术的发展,介质含义越来越广泛,程序的传播途径不再受限于有形介质,还可以直接从网络下载等。可以采用一个或多个计算机可读的介质的任意组合。计算机可读介质可以是计算机可读信号介质或者计算机可读存储介质。计算机可读存储介质例如可以是——但不限于——电、磁、光、电磁、红外线、或半导体的系统、装置或器件,或者任意以上的组合。计算机可读存储介质的更具体的例子(非穷举的列表)包括:具有一个或多个导线的电连接、便携式计算机磁盘、硬盘、随机存取存储器(RAM)、只读存储器(ROM)、可擦式可编程只读存储器(EPROM或闪存)、光纤、便携式紧凑磁盘只读存储器(CD-ROM)、光存储器件、磁存储器件、或者上述的任意合适的组合。在本文件中,计算机可读存储介质可以是任何包含或存储程序的有形介质,该程序可以被指令执行系统、装置或者器件使用或者与其结合使用。
计算机可读的信号介质可以包括在基带中或者作为载波一部分传播的数据信号,其中承载了计算机可读的程序代码。这种传播的数据信号可以采用多种形式,包括——但不限于——电磁信号、光信号或上述的任意合适的组合。计算机可读的信号介质还可以是计算机可读存储介质以外的任何计算机可读介质,该计算机可读介质可以发送、传播或者传输用于由指令执行系统、装置或者器件使用或者与其结合使用的程序。
以上所述仅为本申请的较佳实施例而已,并不用以限制本申请,凡在本申请的精神和原则之内,所做的任何修改、等同替换、改进等,均应包含在本申请保护的范围之内。

Claims (77)

  1. 一种系统间切换的方法,其特征在于,该方法包括:
    网络侧设备确定触发UE从第一系统向第二系统的切换;
    通知所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;
    执行从所述第一系统会话到对应的第二系统会话的切换,释放所述第一系统会话。
  2. 根据权利要求1所述的方法,其特征在于,该方法还包括:
    依据预先确定的第一系统会话标识和是否执行先通后断MBB的对应关系,确定是否针对所述第一系统会话执行MBB切换,如果是,则执行所述通知所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话的步骤。
  3. 根据权利要求2所述的方法,其特征在于,所述第一系统会话标识和是否执行MBB的对应关系是在所述第一系统会话建立/修改过程中,第一系统核心网侧设备根据所述第一系统会话的会话特征和预设的切换策略确定的。
  4. 根据权利要求3的方法,所述会话特征包括:S-NSSAI和/或DNN。
  5. 根据权利要求3所述的方法,其特征在于,第一系统核心网侧设备在第一系统会话建立或修改时,将针对所述第一系统会话进行MBB的指示信息发送给第一系统接入网侧设备;
    所述第一系统接入网侧设备在发起从第一系统向第二系统的切换时,携带所述指示信息。
  6. 根据权利要求3所述的方法,其特征在于,第一系统核心网侧设备确定触发UE的第一系统向第二系统的切换后,通过系统间N26接口向第二系统核心网侧设备发送包含预设标识信息的切换要求消息;
    所述第二系统核心网侧设备依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
  7. 根据权利要求5所述的方法,其特征在于,第一系统接入网侧设备确定触发UE的第一系统向第二系统的切换后,通过系统间N26接口向第二系统核心网侧设备发送包含预设标识信息的切换要求消息;
    所述第二核心网侧设备依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
  8. 根据权利要求6或7所述的方法,其特征在于,所述准备包括:移动性管理和会话管理的上下文映射。
  9. 根据权利要求8所述的方法,其特征在于,所述准备还包括:为第二系统会话分配与对应的第一系统会话相同的IP地址。
  10. 根据权利要求1所述的方法,其特征在于,通知所述UE建立与正在使用的第一系统会话相对应的第二系统会话包括:
    向所述UE发送包含预设标识信息的命令,以指示所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
  11. 根据权利要求1所述的方法,其特征在于,该方法还包括:
    第二系统核心网侧设备接收到所述UE发送的包含预设标识信息的连接请求后,为所述UE建立所述第二系统会话。
  12. 根据权利要求1所述的方法,其特征在于,执行从所述第一系统会话到对应的第二系统会话的切换,释放所述第一系统会话包括:
    第二系统核心网侧设备将应用数据流从所述第一系统会话切换到对应的第二系统会话,释放所述第一系统会话。
  13. 根据权利要求1所述的方法,其特征在于,执行从所述第一系统会话到 对应的第二系统会话的切换,释放所述第一系统会话包括:
    第一核心网侧设备在接收到所述UE发送的释放会话消息后,释放所述第一系统会话,以将应用数据流从所述第一系统会话切换到对应的第二系统会话。
  14. 根据权利要求12或13所述的方法,其特征在于,该方法还包括:
    从所述第一系统会话到对应的第二系统会话的切换后,第二系统核心网侧设备向统一数据管理设备发送切换完成消息,触发所述统一数据管理设备针对所述UE在第一系统进行去注册;或者,
    第一系统核心网侧设备向统一数据管理设备发送请求,触发所述统一数据管理设备针对所述UE在第一系统进行去注册。
  15. 根据权利要求14所述的方法,其特征在于,所述切换完成消息包括:包含初始附着Initial attach参数的位置更新Update Location消息。
  16. 根据权利要求1所述的方法,其特征在于,该方法还包括:
    网络侧设备接收到所述UE发送的携带双通能力信息的注册请求或位置更新请求后,确定是否允许所述UE使用双通能力,并记录确定结果;
    在确定触发所述UE的第一系统向第二系统的切换时,依据所述记录判断所述UE具备双通能力时,继续执行所述通知所述UE建立与正在使用的第一系统会话相对应的第二系统会话的步骤。
  17. 根据权利要求16所述的方法,其特征在于,该方法还包括:
    将是否允许所述UE使用双通能力的信息携带在注册响应或位置更新响应中返回给所述UE。
  18. 根据权利要求1所述的方法,其特征在于,在完成所述切换之前,网络侧设备与所述UE之间的数据传输同时在所述第一系统会话和第二系统会话上进行。
  19. 根据权利要求1至18任一权项所述的方法,其特征在于,所述第一系统为5G系统,所述第二系统为4G系统;或者,
    所述第二系统为4G系统,所述第一系统为5G系统;或者,
    所述第一系统和第二系统分别为同一核心网下的不同基站类型系统。
  20. 一种注册方法,其特征在于,该方法包括:
    网络侧设备接收UE发送的注册请求或位置更新请求,所述注册请求或位置更新请求携带双通能力信息;
    其中所述双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
  21. 根据权利要求20所述的方法,其特征在于,该方法还包括:
    确定是否允许所述UE使用双通能力,并记录确定结果。
  22. 根据权利要求21所述的方法,其特征在于,该方法还包括:
    将是否允许所述UE使用双通能力的信息携带在注册响应或位置更新响应中返回给所述UE。
  23. 一种系统间切换的方法,其特征在于,该方法包括:
    第一系统接入网侧设备确定触发UE的第一系统向第二系统的切换后,向第二系统核心网侧设备发送包含预设标识信息的切换要求消息;
    所述第二系统核心网侧设备依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
  24. 一种系统间切换的方法,其特征在于,该方法包括:
    第一系统网络侧设备向UE发送包含预设标识信息的命令,以指示所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
  25. 根据权利要求24所述的方法,其特征在于,所述第一系统网络侧设备包 括:
    第一系统核心网侧设备或第一系统接入网侧设备。
  26. 根据权利要求24所述的方法,特征在于,所述包含预设标识信息的命令包括:NAS消息或RRC重配置消息。
  27. 根据权利要求24所述的方法,其特征在于,该方法还包括:
    第二系统核心网侧设备接收到所述UE发送的包含预设标识信息的连接请求后,为所述UE建立所述第二系统会话。
  28. 一种系统间切换的方法,其特征在于,该方法包括:
    UE接收到网络侧设备的通知后,采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;
    在从所述第一系统会话到对应的第二系统会话的切换完成后,切换回单通模式。
  29. 根据权利要求28所述的方法,其特征在于,所述UE接收到网络侧设备的通知包括:
    所述UE接收到网络侧设备发送的包含预设标识信息的命令。
  30. 根据权利要求28所述的方法,其特征在于,所述采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话包括:
    所述UE向第二系统核心网侧设备发送包含预设标识信息的连接请求,以建立所述第二系统会话。
  31. 根据权利要求28所述的方法,其特征在于,该方法还包括:
    所述UE向第一系统核心网侧设备发送释放会话消息,以释放所述第一系统会话并将应用数据流从所述第一系统会话切换到对应的第二系统会话。
  32. 根据权利要求28所述的方法,其特征在于,在完成所述切换之前,该方法还包括:
    所述UE与网络侧设备之间的数据传输同时在所述第一系统会话和第二系统会话上进行。
  33. 根据权利要求28至32任一权项所述的方法,其特征在于,所述第一系统为5G系统,所述第二系统为4G系统;或者,
    所述第二系统为4G系统,所述第一系统为5G系统。
  34. 一种注册方法,其特征在于,该方法包括:
    UE向网络侧设备发送注册请求或位置更新请求,所述注册请求或位置更新请求携带双通能力信息;
    其中所述双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
  35. 根据权利要求34所述的方法,其特征在于,该方法还包括:
    接收所述网络侧设备返回的注册响应或位置更新响应,所述注册响应或位置更新响应包含所述网络侧设备是否允许所述UE使用双通能力的信息。
  36. 一种系统间切换的方法,其特征在于,该方法包括:
    UE接收第一系统网络侧设备发送的包含预设标识信息的命令;
    采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
  37. 根据权利要求36所述的方法,其特征在于,所述第一系统网络侧设备包括:
    第一系统核心网侧设备或第一系统接入网侧设备。
  38. 根据权利要求36所述的方法,其特征在于,所述包含预设标识信息的命令包括:NAS消息或RRC重配置消息。
  39. 根据权利要求36所述的方法,其特征在于,所述采用双通模式建立与正 在使用的第一系统会话相对应的第二系统会话包括:
    所述UE向第二系统核心网侧设备发送包含预设标识信息的连接请求,以建立所述第二系统会话。
  40. 一种系统间切换的装置,设置于网络侧,其特征在于,该装置包括:
    第一确定单元,用于确定触发UE从第一系统向第二系统的切换;
    通知单元,用于通知所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;
    切换单元,用于执行从所述第一系统会话到对应的第二系统会话的切换,释放所述第一系统会话。
  41. 根据权利要求40所述的装置,其特征在于,该装置还包括:
    决策单元,用于预先确定的第一系统会话标识和是否执行先通后断MBB的对应关系,确定是否针对所述第一系统会话执行MBB切换;
    所述通知单元在所述决策单元的决策结果为是时,执行所述通知所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话的处理。
  42. 根据权利要求41所述的装置,其特征在于,所述第一系统会话标识和是否执行MBB的对应关系是在所述第一系统会话建立/修改过程中,第一系统核心网侧设备根据所述第一系统会话的会话特征和预设的切换策略确定的。
  43. 根据权利要求42所述的装置,其特征在于,所述会话特征包括:S-NSSAI和/或DNN。
  44. 根据权利要求42所述的装置,其特征在于,设置于第一系统核心网侧设备的指示单元,能够在第一系统会话建立或修改时,将针对所述第一系统会话进行MBB的指示信息发送给第一系统接入网侧设备;
    所述第一确定单元设置于第一系统接入网侧设备,还用于在发起从第一系统向第二系统的切换时,携带所述指示信息。
  45. 根据权利要求42所述的装置,其特征在于,所述第一确定单元设置于第一系统核心网侧设备,还用于确定触发UE的第一系统向第二系统的切换后,通过系统间N26接口向第二系统核心网侧设备发送包含预设标识信息的切换要求消息;
    该装置还包括:设置于第二系统核心网侧的准备单元,用于依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
  46. 根据权利要求44所述的装置,其特征在于,所述第一确定单元设置于第一系统接入网侧设备,还用于确定触发UE的第一系统向第二系统的切换后,通过系统间N26接口向第二系统核心网侧设备发送包含预设标识信息的切换要求消息;
    设置于第二核心网侧设备的准备单元,用于依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
  47. 根据权利要求45或46所述的装置,其特征在于,所述准备包括:移动性管理和会话管理的上下文映射。
  48. 根据权利要求47所述的装置,其特征在于,所述准备还包括:为第二系统会话分配与对应的第一系统会话相同的IP地址。
  49. 根据权利要求40所述的装置,其特征在于,所述通知单元,具体用于向所述UE发送包含预设标识信息的命令,以指示所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
  50. 根据权利要求40所述的装置,其特征在于,该装置还包括:建立单元,设置于第二系统核心网侧,用于接收到所述UE发送的包含预设标识信息的连接请求后,为所述UE建立所述第二系统会话。
  51. 根据权利要求40所述的装置,其特征在于,所述切换单元设置于第二系统核心网侧,具体执行:
    将应用数据流从所述第一系统会话切换到对应的第二系统会话,释放所述第一系统会话。
  52. 根据权利要求40所述的装置,其特征在于,所述切换单元设置于第一系统核心网侧,具体执行:
    在接收到所述UE发送的释放会话消息后,释放所述第一系统会话,以将应用数据流从所述第一系统会话切换到对应的第二系统会话。
  53. 根据权利要求51或52所述的装置,其特征在于,该装置还包括:
    设置于第二系统核心网侧的去注册单元,用于在所述切换单元完成从所述第一系统会话到对应的第二系统会话的切换后,向统一数据管理设备发送切换完成消息,触发所述统一数据管理设备针对所述UE在第一系统进行去注册;或者,
    设置于第一系统核心网侧的去注册单元,用于向统一数据管理设备发送请求,触发所述统一数据管理设备针对所述UE在第一系统进行去注册。
  54. 根据权利要求53所述的装置,其特征在于,所述切换完成消息包括:包含初始附着Initial attach参数的位置更新Update Location消息。
  55. 根据权利要求40所述的装置,其特征在于,该装置还包括:
    传输单元,用于在所述切换单元完成所述切换之前,将网络侧设备与所述UE之间的数据传输同时在所述第一系统会话和第二系统会话上进行。
  56. 根据权利要求40至55所述的装置,其特征在于,所述第一系统为5G系统,所述第二系统为4G系统;或者,
    所述第二系统为4G系统,所述第一系统为5G系统;或者,
    所述第一系统和第二系统分别为同一核心网下的不同基站类型系统。
  57. 一种注册装置,设置于网络侧,其特征在于,该装置包括:
    接收单元,用于接收UE发送的注册请求或位置更新请求,所述注册请求或位置更新请求携带双通能力信息;
    其中所述双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
  58. 根据权利要求57所述的装置,其特征在于,该装置还包括:
    第二确定单元,用于确定是否允许所述UE使用双通能力,并记录确定结果。
  59. 根据权利要求58所述的装置,其特征在于,该装置还包括:
    响应单元,用于将是否允许所述UE使用双通能力的信息携带在注册响应或位置更新响应中返回给所述UE。
  60. 一种系统间切换的装置,其特征在于,该装置包括:
    发送单元,用于在第一系统接入网侧确定触发UE的第一系统向第二系统的切换后,向第二系统核心网侧发送包含预设标识信息的切换要求消息;
    准备单元,设置于第二系统核心网侧,用于依据所述预设标识信息,针对所述UE进行第二系统会话的准备。
  61. 一种系统间切换的装置,其特征在于,该装置包括:
    发送单元,设置于第一系统网络侧,用于向UE发送包含预设标识信息的命令,以指示所述UE采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
  62. 根据权利要求61所述的装置,其特征在于,所述第一系统网络侧设备包括:
    第一系统核心网侧设备或第一系统接入网侧设备。
  63. 根据权利要求61所述的装置,其特征在于,所述包含预设标识信息的命 令包括:NAS消息或RRC重配置消息。
  64. 根据权利要求61所述的装置,其特征在于,该装置包括:
    建立单元,设置于第二系统核心网侧,用于接收到所述UE发送的包含预设标识信息的连接请求后,为所述UE建立所述第二系统会话。
  65. 一种系统间切换的装置,设置于UE,其特征在于,该装置包括:
    接收单元,用于接收网络侧设备的通知;
    建立单元,用于在所述接收单元接收到网络侧设备的通知后,采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话;
    切换单元,用于在从所述第一系统会话到对应的第二系统会话的切换完成后,切换回单通模式。
  66. 根据权利要求65所述的装置,其特征在于,所述接收单元,具体执行:
    接收网络侧设备发送的包含预设标识信息的命令。
  67. 根据权利要求65所述的装置,其特征在于,所述建立单元,具体执行:
    向第二系统核心网侧设备发送包含预设标识信息的连接请求,以建立所述第二系统会话。
  68. 根据权利要求67所述的装置,其特征在于,所述切换单元,还用于向第一系统核心网侧设备发送释放会话消息,以释放所述第一系统会话并将应用数据流从所述第一系统会话切换到对应的第二系统会话。
  69. 根据权利要求65所述的装置,其特征在于,该装置还包括:
    传输单元,用于在所述切换单元完成所述切换之前,将所述UE与网络侧设备之间的数据传输同时在所述第一系统会话和第二系统会话上进行。
  70. 一种注册装置,设置于UE,其特征在于,该装置包括:
    发送单元,用于向网络侧设备发送注册请求或位置更新请求,所述注册请求或位置更新请求携带双通能力信息;
    其中所述双通能力信息指示UE能够采用双通模式建立与正在使用的第一系统会话对应的第二系统会话。
  71. 根据权利要求70所述的装置,其特征在于,该装置还包括:
    接收单元,用于接收所述网络侧设备返回的注册响应或位置更新响应,所述注册响应或位置更新响应包含所述网络侧设备是否允许所述UE使用双通能力的信息。
  72. 一种系统间切换的装置,其特征在于,该装置包括:
    接收单元,用于接收第一系统网络侧设备发送的包含预设标识信息的命令;
    建立单元,用于采用双通模式建立与正在使用的第一系统会话相对应的第二系统会话。
  73. 根据权利要求72所述的装置,其特征在于,所述第一系统网络侧设备包括:
    第一系统核心网侧设备或第一系统接入网侧设备。
  74. 根据权利要求72所述的装置,其特征在于,所述包含预设标识信息的命令包括:NAS消息或RRC重配置消息。
  75. 根据权利要求72所述的装置,其特征在于,所述建立单元,具体执行:
    向第二系统核心网侧设备发送包含预设标识信息的连接请求,以建立所述第二系统会话。
  76. 一种设备,包括
    一个或者多个处理器;
    存储器;
    一个或者多个程序,所述一个或者多个程序存储在所述存储器中,被所述一个 或者多个处理器执行如权利要求1至39中任一权项所述方法中的操作。
  77. 一种包含计算机可执行指令的存储介质,所述计算机可执行指令在由计算机处理器执行时用于执行如权利要求1至39中任一权项所述方法中的操作。
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