WO2024001890A1 - 用户面功能实体切换方法、装置、计算机设备及计算机可读介质 - Google Patents

用户面功能实体切换方法、装置、计算机设备及计算机可读介质 Download PDF

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WO2024001890A1
WO2024001890A1 PCT/CN2023/101505 CN2023101505W WO2024001890A1 WO 2024001890 A1 WO2024001890 A1 WO 2024001890A1 CN 2023101505 W CN2023101505 W CN 2023101505W WO 2024001890 A1 WO2024001890 A1 WO 2024001890A1
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Prior art keywords
session
upf
pdu session
reestablishment
identifier
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PCT/CN2023/101505
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English (en)
French (fr)
Inventor
张艺
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深圳市中兴微电子技术有限公司
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Publication of WO2024001890A1 publication Critical patent/WO2024001890A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • the present disclosure relates to the field of communication technology, and specifically to a user plane functional entity switching method, device, computer equipment and computer-readable media.
  • the mobile communication system consists of user terminals, base stations and core network equipment.
  • a PDU (Protocol Data Unit) session represents the connection between the terminal and a DN (Data Network).
  • a data service connection is divided into IPv4, IPv6 and other types.
  • UE User Equipment, user terminal
  • SMF Session Management Function, session management function entity
  • AMF Authentication Management Function, authentication management function entity.
  • SMF Session Management Function
  • AMF Authentication Management Function, authentication management function entity
  • the SMF when the SMF believes that the current UPF can no longer continue to serve the UE, it can select a suitable new UPF and may allocate a new IP (Internet Protocol) address, and then notify the UE to reestablish the session.
  • IP Internet Protocol
  • the 5G communication system defines three different levels of session and service continuity modes (Session and Service Continuity Mode) for PDU sessions. , that is, SSC mode 1 to SSC mode 3.
  • SSC mode 1 Session and Service Continuity Mode 3.
  • SSC mode 2 if the PDU session anchor point UPF needs to be changed due to the movement of the UE, the SMF will notify the UE and require it to perform a session reestablishment process initiated by the UE.
  • the present disclosure provides a UPF switching method, device, computer equipment and computer-readable media.
  • the address of the UPF, the second UPF is the target UPF of the handover and corresponds to the second PDU session; reconstruct the second PDU session locally based on at least the attribute information of the first PDU session and the address of the second UPF;
  • the second PDU session reestablishment result determines a session identifier, and sends a reestablishment response message carrying the session identifier to the SMF, where the session identifier is the identifier of the first PDU session or the identifier of the second PDU session.
  • Embodiments of the present disclosure also provide a UPF switching device.
  • the UPF switching device is applied to SMF and includes a selection module, a sending module, a receiving module and a processing module.
  • the selection module is used to select the first UPF corresponding to the first PDU session.
  • Unable to provide services to UE select the second UPF, obtain the address of the second UPF, and instruct the second UPF to establish an N3 tunnel, wherein the first PDU session is the current PDU session, and the second UPF is the switched
  • the target UPF corresponds to the second PDU session
  • the sending module is configured to send a reestablishment notification message to the UE, where the reestablishment notification message carries the address of the second UPF and a message for instructing the UE to reestablish the PDU session.
  • Session reestablishment mark the receiving module is configured to receive the reestablishment response message sent by the UE and obtain the session identifier carried therein; the processing module is configured to: when it is determined that the UE has completed session reestablishment according to the session identifier, The second PDU session provides session management functions.
  • the second UPF is the target UPF of the switch and corresponds to the second PDU session;
  • the session re-establishment module is configured to at least according to the first The second PDU session is reestablished locally using the attribute information of the PDU session and the address of the second UPF;
  • the sending module is configured to determine a session identifier based on the second PDU session reconstruction result, and send the session identifier carrying the A reestablishment response message of a session identifier, where the session identifier is the identifier of the first PDU session or the identifier of the second PDU session.
  • Embodiments of the present disclosure also provide a computer device, including: one or more processors; a storage device on which one or more programs are stored; when the one or more programs are processed by the one or more processors, When executed, the one or more processors are caused to implement the UPF switching method as described above.
  • Figure 1 is a schematic diagram of the UPF switching process with SMF as the execution subject according to an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram of another UPF switching process using SMF as the execution subject according to an embodiment of the present disclosure
  • Figure 5 is a signaling diagram of the UPF switching process according to an embodiment of the present disclosure.
  • Figure 6 is a schematic structural diagram of a UPF switching device according to an embodiment of the present disclosure.
  • Figure 7 is another structural schematic diagram of a UPF switching device according to an embodiment of the present disclosure.
  • Figure 8 is another structural schematic diagram of a UPF switching device according to an embodiment of the present disclosure.
  • Embodiments described herein may be described with reference to plan and/or cross-sectional illustrations, with the aid of idealized schematic illustrations of the present disclosure. Accordingly, example illustrations may be modified based on manufacturing techniques and/or tolerances. Therefore, the embodiments are not limited to those shown in the drawings but include modifications of configurations formed based on the manufacturing process. Accordingly, the regions illustrated in the figures are schematic in nature, and the shapes of the regions illustrated in the figures are illustrative of the specific shapes of regions of elements and are not intended to be limiting. sexual.
  • SMF sends a standard signaling Release Command message and carries a reason value to inform the UE to reestablish the PDU session. After receiving the release command message, the UE immediately releases the original session and starts trying to initiate a standard signaling Establishment Request message for a new session establishment request.
  • SMF sends a standard signaling Modification Command message to inform the UE to perform PDU
  • the UE begins to try to initiate a new session establishment request standard signaling Establishment Request (Establishment Request) message, and the data network promises to maintain the old session for a certain period of time to try to avoid service interruption before the new session is established.
  • Establishment Request standard signaling Establishment Request
  • the UPF switching method is applied to SMF and includes the following steps S11 to S14.
  • step S11 when the first UPF corresponding to the first PDU session cannot provide services for the UE, select the second UPF, obtain the address of the second UPF, and instruct the second UPF to establish an N3 tunnel.
  • the first PDU session is the current PDU session
  • the second UPF is the target UPF of the switch. And corresponds to the second PDU session.
  • the SMF learns that the original UPF cannot continue to serve the UE, it selects the target UPF, obtains the address of the target UPF, and establishes a connection between the RAN (Radio Access Network) node and the target UPF.
  • RAN Radio Access Network
  • step S12 a re-establishment notification message is sent to the UE, where the re-establishment notification message carries the address of the second UPF and a session re-establishment mark used to instruct the UE to re-establish the PDU session.
  • the reconstruction notification message can be a Release Command message; for SSC mode 3, the reconstruction notification message can be a Modification Command message. Both the Release Command message and the Modification Command message are standard signaling.
  • the re-establishment notification message sent by the SMF to the UE not only carries the IP address of the target UPF of the handover, but also carries a session re-establishment mark used to instruct the UE to re-establish the PDU session.
  • SMF uses the reestablishment notification message sent to the UE in the notification process to carry the session reestablishment mark, which can trigger the UE to perform session reestablishment PDU session.
  • step S13 the reestablishment response message sent by the UE is received, and the session identifier carried in the reestablishment response message is obtained.
  • the UE After completing the PDU session reestablishment, the UE returns a reestablishment response message to the SMF, and the reestablishment response message carries the session identifier. It should be noted that, depending on whether the PDU session is reestablished successfully or not, the session identifier carried in the reestablishment response message is different.
  • the reconstruction response message can be a Release Complete message; for SSC mode 3, the reconstruction response message can be a Modification Complete message. Both the Release Complete message and the Modification Complete message are standard signaling.
  • step S14 when it is determined that the UE has completed session reestablishment according to the session identifier, a session management function is provided for the second PDU session.
  • the SMF determines that the UE has completed session reestablishment based on the session identifier, it provides the session management function for the target PDU, thereby completing the PDU session anchor switching.
  • the UPF switching method by changing the PDU session reconstruction process and using the standard signaling of the existing PDU session process to implement PDU session anchor point switching, the signaling interaction process between network elements is reduced, and service continuity is ensured. On request, you can It reduces the signaling overhead and delay caused by PDU session anchor point switching and avoids service interruption. It can also be implemented by software upgrade of existing equipment, which is easy to implement and low cost.
  • the session reestablishment flag may be carried through the SM Cause information element of the reestablishment notification message.
  • the session reestablishment flag can be a preset value, and the SMF sets the value of the SM Cause information element of the reestablishment notification message to the preset value to inform the UE that PDU session reestablishment is required.
  • the reestablishment notification message also carries the remaining life time (Address LifeTime IE) of the first UPF and/or the QoS (Quality of Service, Quality of Service) information of the second PDU session.
  • the remaining life time of the first UPF indicates the time during which the first UPF can still provide services for the current PDU session. After the remaining life time is reached, the UE can no longer transmit data to the data network through the first PDU session. Therefore, the UE must Complete the PDU session reestablishment within the remaining life time.
  • the QoS information of the second PDU session may be the same as or different from the QoS information of the first PDU session.
  • the SMF informs the UE of the QoS information of the second PDU session so that the UE can reconstruct the second PDU session based on the QoS information.
  • At least one of the following information can be carried through the EPCO (Extended Protocol Configuration Options) cell of the reconstruction notification message: the address of the second UPF, the remaining life time of the first UPF, the second PDU Session QoS information. That is to say, one or any combination of the above three types of information can be stored in the EPCO information element of the reconstruction notification message.
  • EPCO Extended Protocol Configuration Options
  • obtaining the session identifier carried in the reestablishment response message includes: obtaining the session identifier carried in the EPCO information element of the reestablishment response message. That is to say, the session identifier is carried in the EPCO information element of the reestablishment response message.
  • determining that the UE has completed the session reestablishment according to the session identifier includes the following steps: in the case where the session identifier is not the identifier of the first PDU session, determining that the UE has completed the session reestablishment. At this time, the session identifier Is the identifier of the second PDU session.
  • the UPF switching method may further include the following step S14'.
  • step S14' when the session identifier is the identifier of the first PDU session, release Put the resources of the second PDU session.
  • the reestablishment response message carries the identifier of the second PDU session; if the UE fails to reestablish the PDU session, the reestablishment response message carries the identifier of the first PDU session. Therefore, SMF passes the reestablishment response message.
  • the session ID in can determine whether the PDU session is reestablished successfully.
  • the SMF provides the session management function for the second PDU session, and completes the switch from the anchor point of the first PDU session (i.e., the first UPF) to the second PDU session when the remaining life time of the first UPF arrives.
  • the anchor point for the second PDU session i.e., the second UPF.
  • SMF releases the resources of the established second PDU session and no longer switches the PDU session anchor point.
  • the UPF switching method before sending the reestablishment notification message to the UE (ie, step S12), the UPF switching method further includes the following step S12'.
  • step S12' the status of the first PDU session is updated from the connection status to the reestablishment status.
  • step S14 when it is determined that the UE has completed session reestablishment according to the session identifier carried in the reestablishment response message, the state of the second PDU session is set to the connected state.
  • the SMF obtains the identifier of the second PDU session from the re-establishment response message, it means that the UE has completed the session re-establishment and has completed switching from the first UDP to the second UDP.
  • the status of the PDU session will be updated.
  • the status of the second PDU session is set to the connected status.
  • Embodiments of the present disclosure also provide a UPF switching method. As shown in Figure 4, the UPF switching method is applied to a UE and includes the following steps S41 to S44.
  • step S41 receive a re-establishment notification message sent by the SMF.
  • the re-establishment notification message is sent by the SMF when it is determined that the first UPF corresponding to the first PDU session cannot provide services for the UE, and the first PDU session is the current PDU session.
  • the UE receives the reestablishment notification message sent by the SMF.
  • step S42 when the session re-establishment mark is obtained from the re-establishment notification message, the address of the second UPF is obtained from the re-establishment notification message.
  • the second UPF is the target UPF of the handover and corresponds to the second PDU session.
  • the UE obtains the session re-establishment flag from the re-establishment notification message, indicating that the re-establishment notification message is used to trigger the UE to perform PDU session re-establishment, then the UE obtains the second UPF corresponding to the second PDU session from the re-establishment notification message. address.
  • step S43 the second PDU session is rebuilt locally based on at least the attribute information of the first PDU session and the address of the second UPF.
  • the basic attributes of the PDU session such as session type, service continuity requirements, destination DN (data network name) and S-NSSAI (Single Network Slice Selection Assistance information, single network slice selection Assistance information), etc. do not change, so the UE can successfully complete the establishment of a new session locally based on the new address carried in the received reestablishment notification message and the basic attributes of the PDU session, and only needs to assign a PDU session identifier to the new session.
  • step S44 the session identifier is determined based on the second PDU session reestablishment result, and a reestablishment response message carrying the session identifier is sent to the SMF, where the session identifier is the identifier of the first PDU session or the identifier of the second PDU session.
  • the reestablishment response message carries the second PDU session identifier; if the PDU session fails to be reestablished (that is, the second PDU session is not successfully established), Then the reestablishment response message carries the first PDU session identifier.
  • the reconstruction response message can be a Release Complete message; for SSC mode 3, the reconstruction response message can be a Modification Complete message. Both the Release Complete message and the Modification Complete message are standard signaling.
  • the UPF switching method by changing the PDU session reconstruction process and using the standard signaling of the existing PDU session process to implement PDU session anchor point switching, the signaling interaction process between network elements is reduced, and service continuity is ensured.
  • the signaling overhead and delay caused by PDU session anchor point switching can be reduced to avoid service interruption; and it can be implemented by software upgrade of existing equipment, which is easy to implement and low cost.
  • the UPF switching method further includes the following step: when obtaining the session reestablishment flag from the reestablishment notification message, obtaining the QoS information of the second PDU session from the reestablishment notification message.
  • the QoS information of the second PDU session may be the same as or different from the QoS information of the first PDU session.
  • the SMF informs the UE of the QoS information of the second PDU session, and the UE reconstructs the second PDU session based on the QoS information.
  • the UPF switching method further includes the following step: when obtaining the session reestablishment flag from the reestablishment notification message, obtaining the remaining life time of the first UPF from the reestablishment notification message.
  • Rebuilding the second PDU session locally at least based on the attribute information of the first PDU session and the address of the second UPF includes: within the remaining life time of the first UPF, at least based on the attribute information of the first PDU session and the address of the second UPF.
  • the second PDU session is reestablished locally with the address of the second UPF. That is to say, within the remaining life time of the first UPF, the second PDU session is rebuilt locally based on the attribute information of the first PDU session, the address of the second UPF, and the QoS information of the second PDU session.
  • the session reestablishment mark is obtained from the reestablishment notification message
  • at least one of the following information is obtained from the EPCO information element of the reestablishment notification message: the address of the second UPF, the remaining life time of the first UPF , QoS information of the second PDU session. That is to say, when the reestablishment notification message is used to trigger PDU session reestablishment, the SMF carries one or any combination of the above three types of information in the EPCO information element of the reestablishment notification message.
  • obtaining the session re-establishment flag from the re-establishment notification message includes: obtaining the session re-establishment flag from the SM Cause information element of the re-establishment notification message. That is to say, when the reestablishment notification message is used to trigger PDU session reestablishment, SMF carries the session reestablishment flag in the SM Cause information element of the reestablishment notification message.
  • determining the session identifier according to the second PDU session reestablishment result includes the following steps: if the second PDU session is reestablished successfully, the session identifier is the identifier of the second PDU session; in the second If the PDU session fails to be reestablished, the session identifier is the identifier of the first PDU session.
  • the UE in order to ensure that the data network knows the session identifier (PDU ID) of the reestablished PDU session, the UE returns the reestablishment response message and carries the new session identifier after the new session is established. If the new session fails to be reestablished, the old session ID is carried in the reestablishment response message.
  • PDU ID session identifier
  • the session identification is carried in the EPCO information element of the reestablishment response message.
  • SMF triggers the UE to perform PDU session reestablishment by carrying the session reestablishment mark in the reestablishment notification message, delivers the IP address and QoS information of the new UPF to the UE through the reestablishment notification message, and processes the reestablishment response returned by the UE. message and updates the PDU session ID.
  • the UE can complete the creation of a new PDU session locally based on the re-establishment notification message carrying the session re-establishment mark, the IP address of the new UPF and the QoS information, and notify the new PDU session ID through the re-establishment response message.
  • Step 1 When the SMF learns that UPF1 can no longer serve the UE, it performs a new UPF selection, that is, selects UPF2, obtains the IP address information of UPF2, and instructs UPF2 to establish a new N3 tunnel.
  • Step 2 SMF marks the status of PDU session 1 as the reconstruction status, constructs the standard signaling Release Command for PDU session 1, carries the address of UPF2 and the remaining life time of PDU1 and other information in the EPCO cell, and sets the 5GSM Cause The value of the IE cell is 39, and the Release Command message is sent to the UE.
  • Step 3 The UE receives the Release Command message under PDU session 1. If it recognizes that the value of 5GSM cause IE is 39, it obtains the address of UPF2 in EPCO, the remaining life time of PDU1 and other information.
  • Step 4 During the remaining life time of PDU1, the UE creates PDU session 2 locally based on the address of UPF2, the attribute information and QoS information of PDU session 1, and creates a session for the PDU session.
  • Phone 2 is assigned session identification PDU ID2.
  • data can continue to be transmitted on PDU session 1 until the remaining life time of PDU1 reaches the end. If the UE successfully creates PDU session 2, perform step 5 and be able to transmit data on the PDU2 session; if the UE fails to create PDU session 2, perform step 5'.
  • Step 5' the UE locally releases the resources of PDU session 1 and constructs a Release Complete message, in which the EPCO carries the session identifier PDU ID1 of PDU session 1 and sends it to the SMF.
  • Step 6 After receiving the Release Complete message, SMF checks the EPCO cell in the Release Complete message, obtains and saves the session ID. If the session identifier is PDU ID1, SMF releases the resources of PDU Session 2; if the session identifier is PDU ID2, SMF updates PDU Session 2 to the connected state and provides session management functions for PDU Session 2.
  • the UE can use PDU session 2 to transmit data to implement handover from UPF1 to UPF2.
  • the disclosed embodiments can effectively avoid two rounds of signaling exchanges between the UE and the network side network element, which can not only reduce the signaling overhead but also shorten the service interruption introduced during the PDU session reestablishment process.
  • the embodiments of the present disclosure use standard signaling to change the reconstruction process of the PDU session to shorten the large signaling overhead and delay introduced during session anchor point switching and avoid increasing the network's service continuity requirements for terminals. , and can be achieved by using existing equipment and hardware to upgrade the L3NAS layer protocol software.
  • embodiments of the present disclosure also provide a UPF switching device.
  • the UPF switching device can be applied to SMF.
  • the UPF switching device includes a selection module 101, a sending module 102, and a receiving module. 103 and processing module 104.
  • the selection module 101 is configured to select a second UPF when the first UPF corresponding to the first PDU session cannot provide services for the UE, obtain the address of the second UPF, and instruct the second UPF to establish an N3 tunnel, where , the first PDU session is the current PDU session, and the second UPF is the target UPF of the switch and corresponds to the second PDU session.
  • the sending module 102 is configured to send a re-establishment notification message to the UE, where the re-establishment notification message carries the address of the second UPF and a session re-establishment mark used to instruct the UE to re-establish a PDU session.
  • the receiving module 103 is configured to receive the reestablishment response message sent by the UE and obtain the session identifier carried therein.
  • the processing module 104 is configured to provide a session management function for the second PDU session when it is determined that the UE has completed session reestablishment according to the session identifier.
  • the SM Cause information element of the reestablishment notification message carries the session reestablishment mark.
  • the reestablishment notification message also carries the remaining life time of the first UPF and/or the QoS information of the second PDU session.
  • the EPCO information element of the reestablishment notification message carries at least one of the following information: the address of the second UPF, the remaining life time of the first UPF, and the QoS information of the second PDU session.
  • the receiving module 103 is configured to obtain the session identifier carried in the EPCO cell of the reconstruction response message.
  • the processing module 104 is configured to determine that the UE has completed session reestablishment when the session identifier is not an identifier of the first PDU session.
  • the UPF switching device further includes a resource release module 105, configured to obtain the session identifier carried in the reestablishment response message and, after the session identifier is the first PDU session, In the case of identification, release the resources of the second PDU session.
  • a resource release module 105 configured to obtain the session identifier carried in the reestablishment response message and, after the session identifier is the first PDU session, In the case of identification, release the resources of the second PDU session.
  • the UPF switching device further includes a status update module 106, configured to change the status of the first PDU session from The connection state is updated to the reestablishment state; and after the receiving module 103 receives the reestablishment response message sent by the UE, when it is determined that the user terminal has completed session reestablishment according to the session identifier carried in the reestablishment response message, the third The status of the second PDU session is set to connected status.
  • a status update module 106 configured to change the status of the first PDU session from The connection state is updated to the reestablishment state; and after the receiving module 103 receives the reestablishment response message sent by the UE, when it is determined that the user terminal has completed session reestablishment according to the session identifier carried in the reestablishment response message, the third The status of the second PDU session is set to connected status.
  • an embodiment of the present disclosure also provides a UE.
  • the UE includes a receiving module 201, an acquisition module 202, and a session reestablishment module 203. and sending module 204.
  • the receiving module 201 is configured to receive a re-establishment notification message sent by the SMF.
  • the re-establishment notification message is sent by the SMF when it is determined that the first UPF corresponding to the first PDU session cannot provide services for the user terminal.
  • the first The PDU session is the current PDU session.
  • the obtaining module 202 is configured to obtain the address of a second UPF from the reestablishment notification message when the session reestablishment mark is obtained from the reestablishment notification message.
  • the second UPF is the target UPF of the handover and corresponds to the second PDU session. .
  • the session reestablishment module 203 is configured to reestablish a second PDU session locally based on at least the attribute information of the first PDU session and the address of the second UPF.
  • the sending module 204 is configured to determine a session identifier according to the second PDU session reconstruction result, and send a reconstruction response message carrying the session identifier to the SMF, where the session identifier is the identifier of the first PDU session or the session identifier. The identifier of the second PDU session.
  • the obtaining module 202 is further configured to obtain the QoS information of the second PDU session from the reestablishment notification message when a session reestablishment mark is obtained from the reestablishment notification message.
  • the session reestablishment module 203 is also configured to reestablish the second PDU session locally according to the attribute information of the first PDU session, the address of the second UPF, and the QoS information of the second PDU session.
  • the obtaining module 202 is further configured to obtain the remaining life time of the first UPF from the reestablishment notification message when a session reestablishment flag is obtained from the reestablishment notification message.
  • the obtaining module 202 is configured to obtain at least one of the following information from the EPCO information element of the reestablishment notification message: the second The address of the UPF, the remaining life time of the first UPF, and the QoS information of the second PDU session.
  • the obtaining module 202 is configured to obtain the session reestablishment mark from the SMCause information element of the reestablishment notification message.
  • the sending module 204 is configured to set the session identifier as the identifier of the second PDU session if the second PDU session is successfully reestablished; if the second PDU session fails to be reestablished, In this case, the session identifier is set as the identifier of the first PDU session.
  • the session identifier is carried in an EPCO information element of the reestablishment response message.
  • An embodiment of the present disclosure also provides a computer device.
  • the computer device includes: one or more processors and a storage device, wherein one or more programs are stored on the storage device.
  • the above one or more programs are used by the above one
  • the above-mentioned one or more processors implement the UPF switching method as provided in the foregoing embodiments.
  • Embodiments of the present disclosure also provide a computer-readable medium on which a computer program is stored, wherein when the computer program is executed, the UPF switching method as provided in the foregoing embodiments is implemented.
  • Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media).
  • computer storage media includes volatile and nonvolatile media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. removable, removable and non-removable media.
  • Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disk (DVD) or other optical disk storage, magnetic cassettes, tapes, disk storage or other magnetic storage devices, or may Any file that stores desired information and can be accessed by a computer other media.
  • communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

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Abstract

本公开提供一种UPF切换方法，应用于SMF，包括：在第一PDU会话对应的第一UPF无法为UE提供服务的情况下，选择第二UPF，获取第二UPF的地址，并指示第二UPF建立N3隧道，其中，第一PDU会话为当前的PDU会话，第二UPF为切换的目标UPF并且对应第二PDU会话；向UE发送重建通知消息，重建通知消息中携带有第二UPF的地址和用于指示UE重建PDU会话的会话重建标记；接收UE发送的重建响应消息，获取重建响应消息中携带的会话标识；当根据会话标识确定UE已完成会话重建时，为第二PDU会话提供会话管理功能。本公开还提供一种UPF切换装置、计算机设备及计算机可读介质。

Description

用户面功能实体切换方法、装置、计算机设备及计算机可读介质
相关申请的交叉引用
本申请要求于2022年6月29日提交的名称为“UPF切换方法、装置、计算机设备及计算机可读介质”的中国专利申请CN 202210749053.8的优先权，其全部内容通过引用并入本文中。
技术领域
本公开涉及通信技术领域，具体涉及一种用户面功能实体切换方法、装置、计算机设备和计算机可读介质。
背景技术
移动通信系统由用户终端、基站和核心网设备组成，在现有的5G通信系统中，一个PDU(Protocol Data Unit，协议数据单元)会话代表了终端与一个DN(Data Network，数据网络)之间的一次数据服务连接，分为IPv4、IPv6等类型。通常，一次会话的建立过程由UE(User Equipment，用户终端)发起会话建立请求，请求消息经过AMF(Authentication Management Function，认证管理功能实体)传递给SMF(Session Management Function,会话管理功能实体)，SMF会为UE选择一或多个UPF(User Plane Function，用户面功能实体)作为会话锚点在UE和DN之间传递数据。由于UE的移动，当SMF认为当前UPF不能再继续服务UE时，可为其选择一个合适的新UPF并可能分配新IP(Internet Protocol，网际互连协议)地址，然后通知UE进行会话的重建。
按照技术规范对于服务连续性的描述，为满足不同终端移动过程中对服务连续性的要求，5G通信系统给PDU会话定义了三种不同等级的会话和服务连续性模式(Session and Service Continuity Mode)，即，SSC mode 1至SSC mode 3。对于SSC mode 2和SSC mode 3，若由于UE的移动需要更改PDU会话锚点UPF，SMF会通知UE并要求其进行由UE发起的会话重建过程。
当前的会话和服务连续性策略中，UPF切换必然需要UE和SMF之间通过一次完整的通知流程及一次完整的新会话建立流程，信令的构造和交换可能导致较大的服务不连续。
发明内容
本公开提供一种UPF切换方法、装置、计算机设备和计算机可读介质。
本公开实施例提供一种UPF切换方法，应用于SMF，所述方法包括：在第一PDU会话对应的第一UPF无法为UE提供服务的情况下，选择第二UPF，获取所述第二UPF的地址，并指示所述第二UPF建立N3隧道，其中，所述第一PDU会话为当前的PDU会话，所述第二UPF为切换的目标UPF并且对应第二PDU会话；向所述UE发送重建通知消息，所述重建通知消息中携带有所述第二UPF的地址和用于指示所述UE重建PDU会话的会话重建标记；接收所述UE发送的重建响应消息，获取所述重建响应消息中携带的会话标识；当根据所述会话标识确定所述UE已完成会话重建时，为所述第二PDU会话提供会话管理功能。
本公开实施例还提供一种UPF切换方法，应用于UE，所述方法包括：接收SMF发送的重建通知消息，所述重建通知消息是所述SMF在确定出第一PDU会话对应的第一UPF无法为所述UE提供服务的情况下发送的，所述第一PDU会话为当前的PDU会话；当从所述重建通知消息中获取到会话重建标记时，从所述重建通知消息中获取第二UPF的地址，所述第二UPF为切换的目标UPF并且对应第二PDU会话；至少根据所述第一PDU会话的属性信息和所述第二UPF的地址在本地重建第二PDU会话；根据所述第二PDU会话重建结果确定会话标识，并向所述SMF发送携带有所述会话标识的重建响应消息，所述会话标识为所述第一PDU会话的标识或所述第二PDU会话的标识。
本公开实施例还提供一种UPF切换装置，所述UPF切换装置应用于SMF，包括选择模块、发送模块、接收模块和处理模块，所述选择模块用于在第一PDU会话对应的第一UPF无法为UE提供服务的情 况下，选择第二UPF，获取所述第二UPF的地址，并指示所述第二UPF建立N3隧道，其中，所述第一PDU会话为当前的PDU会话，所述第二UPF为切换的目标UPF并且对应第二PDU会话；所述发送模块用于向所述UE发送重建通知消息，所述重建通知消息中携带有所述第二UPF的地址和用于指示所述UE重建PDU会话的会话重建标记；所述接收模块用于接收所述UE发送的重建响应消息，获取其中携带的会话标识；所述处理模块用于当根据所述会话标识确定所述UE已完成会话重建时，为所述第二PDU会话提供会话管理功能。
本公开实施例还提供一种UE，包括：接收模块、获取模块、会话重建模块和发送模块，所述接收模块用于接收SMF发送的重建通知消息，所述重建通知消息是所述SMF在确定出第一PDU会话对应的第一UPF无法为所述UE提供服务的情况下发送的，所述第一PDU会话为当前的PDU会话；所述获取模块用于当从所述重建通知消息中获取到会话重建标记时，从所述重建通知消息中获取第二UPF的地址，所述第二UPF为切换的目标UPF并且对应第二PDU会话；所述会话重建模块用于至少根据所述第一PDU会话的属性信息和所述第二UPF的地址在本地重建第二PDU会话；所述发送模块用于根据所述第二PDU会话重建结果确定会话标识，并向所述SMF发送携带有所述会话标识的重建响应消息，所述会话标识为所述第一PDU会话的标识或所述第二PDU会话的标识。
本公开实施例还提供一种计算机设备，包括：一个或多个处理器；存储装置，其上存储有一个或多个程序；当所述一个或多个程序被所述一个或多个处理器执行时，使得所述一个或多个处理器实现如前所述的UPF切换方法。
本公开实施例还提供一种计算机可读介质，其上存储有计算机程序，其中，所述程序被执行时实现如前所述的UPF切换方法。
附图说明
图1为根据本公开实施例的以SMF为执行主体的UPF切换流程示意图；
图2为根据本公开实施例的以SMF为执行主体的又一UPF切换流程示意图；
图3为根据本公开实施例的以SMF为执行主体的又一UPF切换流程示意图；
图4为根据本公开实施例的以UE为执行主体的UPF切换流程示意图；
图5为根据本公开实施例的UPF切换流程的信令图；
图6为根据本公开实施例的UPF切换装置的结构示意图；
图7为根据本公开实施例的UPF切换装置的又一结构示意图；
图8为根据本公开实施例的UPF切换装置的又一结构示意图；
图9为根据本公开实施例的UE的结构示意图。
具体实施方式
在下文中将参考附图更充分地描述示例实施例，但是所述示例实施例可以以不同形式来体现且不应当被解释为限于本文阐述的实施例。相反，提供这些实施例的目的在于使本公开透彻和完整，并将使本领域技术人员充分理解本公开的范围。
如本文所使用的，术语“和/或”包括一个或多个相关列举条目的任何和所有组合。
本文所使用的术语仅用于描述特定实施例，且不意欲限制本公开。如本文所使用的，单数形式“一个”和“该”也意欲包括复数形式，除非上下文另外清楚指出。还将理解的是，当本说明书中使用术语“包括”和/或“由……制成”时，指定存在所述特征、整体、步骤、操作、元件和/或组件，但不排除存在或添加一个或多个其他特征、整体、步骤、操作、元件、组件和/或其群组。
本文所述实施例可借助本公开的理想示意图而参考平面图和/或截面图进行描述。因此，可根据制造技术和/或容限来修改示例图示。因此，实施例不限于附图中所示的实施例，而是包括基于制造工艺而形成的配置的修改。因此，附图中例示的区具有示意性属性，并且图中所示区的形状例示了元件的区的具体形状，但并不旨在是限制 性的。
除非另外限定，否则本文所用的所有术语(包括技术和科学术语)的含义与本领域普通技术人员通常理解的含义相同。还将理解，诸如那些在常用字典中限定的那些术语应当被解释为具有与其在相关技术以及本公开的背景下的含义一致的含义，且将不解释为具有理想化或过度形式上的含义，除非本文明确如此限定。
在PDU会话锚点切换的相关技术中，对于SSC mode 2，SMF发送标准信令Release Command(释放命令)消息并携带原因值告知UE进行PDU会话重建。UE收到释放命令消息后，立即释放原会话，并开始尝试发起新会话的建立请求的标准信令Establishment Request(建立请求)消息。从旧的会话释放到再次通过新建立的会话进行数据传输之间的时间段内，UE将无法进行数据传输；对于SSC mode 3，SMF发送标准信令Modification Command(修改命令)消息告知UE进行PDU会话重建，UE开始尝试发起新会话的建立请求标准信令Establishment Request(建立请求)消息，且数据网络承诺维护旧的会话一定时长，以尽量避免在新的会话建立之前服务中断。由此可见，在当前的服务连续性策略中，UPF的切换必然需要UE和SMF之间通过一次完整的信令流程通知UE切换UPF并建立新会话，以及一次完整的信令流程建立新会话，信令的构造和交换可能导致较大的服务不连续。
目前，增强PDU会话锚点切换过程的服务连续性的相关技术，主要从以下两方面进行：增大核心网负载要求其同时维持新旧资源；以及构建融合了接入网与核心网网元功能的特殊硬件，因此具有实现困难、成本高的问题。
为解决上述问题，本公开实施例提供一种UPF切换方法，如图1所示，所述UPF切换方法应用于SMF，包括以下步骤S11至S 14。
在步骤S11，在第一PDU会话对应的第一UPF无法为UE提供服务的情况下，选择第二UPF，获取第二UPF的地址，并指示第二UPF建立N3隧道。
第一PDU会话为当前的PDU会话，第二UPF为切换的目标UPF 并且对应第二PDU会话。
在本步骤中，SMF在得知原UPF无法继续为UE服务时，选择目标UPF，获取目标UPF的地址，建立RAN(Radio Access Network，无线接入网)节点和目标UPF之间的连接。
在步骤S12，向UE发送重建通知消息，重建通知消息中携带有第二UPF的地址和用于指示UE重建PDU会话的会话重建标记。
对于SSC mode 2，重建通知消息可以是释放命令(Release Command)消息；对于SSC mode 3，重建通知消息可以是修改命令(Modification Command)消息，释放命令消息和修改命令消息均为标准信令。
在本步骤中，SMF向UE发送的重建通知消息中不但携带有切换的目标UPF的IP地址，还携带有用于指示UE重建PDU会话的会话重建标记。在通知UE切换UPF并建立新会话的过程中，SMF利用通知流程中发送给UE的重建通知消息携带会话重建标记，可以触发UE进行会话重建PDU会话。
在步骤S13，接收UE发送的重建响应消息，获取重建响应消息中携带的会话标识。
在本步骤中，UE在完成PDU会话重建之后，向SMF返回重建响应消息，重建响应消息中携带有会话标识。需要说明的是，根据PDU会话重建成功与否，重建响应消息中携带的会话标识不同。对于SSC mode 2，重建响应消息可以是释放完成(Release Complete)消息；对于SSC mode 3，重建响应消息可以是修改完成(Modification Complete)消息，释放完成消息和修改完成消息均为标准信令。
在步骤S14，当根据会话标识确定UE已完成会话重建时，为第二PDU会话提供会话管理功能。
在本步骤中，若SMF根据会话标识确定出UE已完成会话重建，则为目标PDU提供会话管理功能，从而完成PDU会话锚点切换。
根据本公开实施例提供的UPF切换方法，通过改变PDU会话重建流程，利用现有PDU会话过程的标准信令实现PDU会话锚点切换，减少网元之间信令交互过程，在保证服务连续性要求的前提下，可以 降低PDU会话锚点切换导致的信令开销及时延，避免服务中断；并且可以通过对现有设备进行软件升级实现，易于实现，成本低。
在一些实施例中，可以通过重建通知消息的SM Cause信元携带会话重建标记。会话重建标记可以是预设数值，SMF将重建通知消息的SM Cause信元的值设置为预设数值，以告知UE需要进行PDU会话重建。
在一些实施例中，重建通知消息中还携带有第一UPF的剩余生命时间(Address LifeTime IE)和/或第二PDU会话的QoS(Quality of Service，服务质量)信息。第一UPF的剩余生命时间表示第一UPF还能够为当前的PDU会话提供服务的时间，该剩余生命时间到达后，UE无法再通过第一PDU会话向数据网络传输数据，因此，UE必须在该剩余生命时间内完成PDU会话重建。第二PDU会话的QoS信息可以与第一PDU会话的QoS信息相同或不同，SMF告知UE第二PDU会话的QoS信息，以供UE根据该QoS信息重建第二PDU会话。
在一些实施例中，可以通过重建通知消息的EPCO(Extended Protocol Configuration Options，扩展协议配置选项)信元携带以下至少一种信息：第二UPF的地址、第一UPF的剩余生命时间、第二PDU会话的QoS信息。也就是说，上述三种信息中的一种或者任意组合可以存储在重建通知消息的EPCO信元中。
在一些实施例中，获取重建响应消息中携带的会话标识(即，步骤S13)包括：获取重建响应消息的EPCO信元中携带的会话标识。也就是说，会话标识携带在重建响应消息的EPCO信元中。
在一些实施例中，根据会话标识确定UE已完成会话重建(即，步骤S14)包括以下步骤：在会话标识不是第一PDU会话的标识的情况下，确定UE已完成会话重建，此时会话标识为第二PDU会话的标识。
在一些实施例中，如图2所示，在获取重建响应消息中携带的会话标识(即，步骤S13)之后，所述UPF切换方法还可以包括以下步骤S14'。
在步骤S14'，在会话标识为第一PDU会话的标识的情况下，释 放第二PDU会话的资源。
如果UE重建PDU会话成功，则在重建响应消息中携带第二PDU会话的标识；如果UE重建PDU会话不成功，则在重建响应消息中携带第一PDU会话的标识，因此，SMF通过重建响应消息中的会话标识即可确定PDU会话是否重建成功。在PDU会话重建成功的情况下，SMF为第二PDU会话提供会话管理功能，在第一UPF的剩余生命时间到达时，完成从第一PDU会话的锚点(即，第一UPF)切换至第二PDU会话的锚点(即，第二UPF)。在PDU会话重建不成功的情况下，SMF将已建立的第二PDU会话的资源释放，不再进行PDU会话锚点的切换。
在一些实施例中，如图3所示，在向UE发送重建通知消息(即，步骤S12)之前，所述UPF切换方法还包括以下步骤S12'。
在步骤S12'，将第一PDU会话的状态从连接状态更新为重建状态。
在接收UE发送的重建响应消息(即，步骤S13)之后，所述UPF切换方法还包括以下步骤S14"。
在步骤S14",当根据重建响应消息中携带的会话标识确定UE已完成会话重建时，将第二PDU会话的状态设置为连接状态。
在本步骤中，若SMF从重建响应消息中获取到第二PDU会话的标识，说明UE已完成会话重建，此时已完成从第一UDP切换至第二UDP，则更新PDU会话的状态，将第二PDU会话的状态设置为连接状态。
本公开实施例还提供一种UPF切换方法，如图4所示，所述UPF切换方法应用于UE，包括以下步骤S41至S44。
在步骤S41，接收SMF发送的重建通知消息，重建通知消息是SMF在确定出第一PDU会话对应的第一UPF无法为UE提供服务的情况下发送的，第一PDU会话为当前的PDU会话。
在本步骤中，UE接收SMF发送的重建通知消息。
在步骤S42，当从重建通知消息中获取到会话重建标记时，从重建通知消息中获取第二UPF的地址，第二UPF为切换的目标UPF并且对应第二PDU会话。
在本步骤中，若UE从重建通知消息中获取到会话重建标记，说明该重建通知消息用于触发UE执行PDU会话重建，则UE从重建通知消息中获取第二PDU会话对应的第二UPF的地址。
在步骤S43，至少根据第一PDU会话的属性信息和第二UPF的地址在本地重建第二PDU会话。
由于仅更换UPF锚点，对于UE而言，PDU会话的基本属性，如会话类型、服务连续性需求、目的DN(数据网络名称)和S-NSSAI(Single Network Slice Selection Assistance information，单个网络切片选择协助信息)等并不改变，因此UE根据收到的重建通知消息中携带的新地址和PDU会话的基本属性能够在本地成功完成新会话的建立，并且只需要为新会话分配PDU会话标识。
在步骤S44，根据第二PDU会话重建结果确定会话标识，并向SMF发送携带有会话标识的重建响应消息，会话标识为第一PDU会话的标识或第二PDU会话的标识。
在本步骤中，若PDU会话重建成功(即，第二PDU会话建立成功)，则重建响应消息中携带第二PDU会话标识；若PDU会话重建失败(即，第二PDU会话建立不成功)，则重建响应消息中携带第一PDU会话标识。
对于SSC mode 2，重建响应消息可以是释放完成(Release Complete)消息；对于SSC mode 3，重建响应消息可以是修改完成(Modification Complete)消息，释放完成消息和修改完成消息均为标准信令。
根据本公开实施例提供的UPF切换方法，通过改变PDU会话重建流程，利用现有PDU会话过程的标准信令实现PDU会话锚点切换，减少网元之间信令交互过程，在保证服务连续性要求的前提下，可以降低PDU会话锚点切换导致的信令开销及时延，避免服务中断；并且可以通过对现有设备进行软件升级实现，易于实现，成本低。
在一些实施例中，所述UPF切换方法还包括以下步骤：当从重建通知消息中获取到会话重建标记时，从重建通知消息中获取第二PDU会话的QoS信息。
至少根据第一PDU会话的属性信息和第二UPF的地址在本地重建第二PDU会话(即，步骤S43)包括以下步骤：根据第一PDU会话的属性信息、第二UPF的地址和第二PDU会话的QoS信息在本地重建第二PDU会话。
第二PDU会话的QoS信息可以与第一PDU会话的QoS信息相同或不同，SMF告知UE第二PDU会话的QoS信息，UE根据该QoS信息重建第二PDU会话。
在一些实施例中，所述UPF切换方法还包括以下步骤：当从重建通知消息中获取到会话重建标记时，从重建通知消息中获取第一UPF的剩余生命时间。
至少根据第一PDU会话的属性信息和第二UPF的地址在本地重建第二PDU会话(即，步骤S43)包括：在第一UPF的剩余生命时间内，至少根据第一PDU会话的属性信息和第二UPF的地址在本地重建第二PDU会话。也就是说，在第一UPF的剩余生命时间内，根据第一PDU会话的属性信息、第二UPF的地址和第二PDU会话的QoS信息在本地重建第二PDU会话。
在一些实施例中，在从重建通知消息中获取到会话重建标记的情况下，从重建通知消息的EPCO信元中获取以下至少一种信息：第二UPF的地址、第一UPF的剩余生命时间、第二PDU会话的QoS信息。也就是说，在重建通知消息为用于触发PDU会话重建的情况下，SMF将上述三种信息中的一种或者任意组合携带在重建通知消息的EPCO信元中。
在一些实施例中，从重建通知消息中获取到会话重建标记(即，步骤S42)包括：从重建通知消息的SM Cause信元中获取到会话重建标记。也就是说，在重建通知消息为用于触发PDU会话重建的情况下，SMF将会话重建标记携带在重建通知消息的SM Cause信元中。
在一些实施例中，根据第二PDU会话重建结果确定会话标识(即，步骤S44)包括以下步骤：在第二PDU会话重建成功的情况下，会话标识为第二PDU会话的标识；在第二PDU会话重建失败的情况下，会话标识为第一PDU会话的标识。
在本步骤中，为了确保数据网络得知重建的PDU会话的会话标识(PDU ID)，UE在新会话建立完成后，返回重建响应消息并在其中携带新会话标识。如果新会话重建失败，则在重建响应消息中携带旧的会话标识。
在一些实施例中，会话标识携带在重建响应消息的EPCO信元中。
本公开实施例中，SMF通过在重建通知消息中携带会话重建标记触发UE进行PDU会话重建，并将新的UPF的IP地址和QoS信息通过重建通知消息传递给UE，并且处理UE回复的重建响应消息并更新PDU会话ID。UE可以根据携带有会话重建标记、新的UPF的IP地址和QoS信息的重建通知消息，在本地完成新的PDU会话创建，并通过重建响应消息告知新的PDU会话ID。
为清楚说明本公开实施例的方案，以下结合图5，通过一具体实例对本公开实施例的UPF切换过程进行详细说明。
在该实例中，UE与SMF之间已建立类型为IPv4的PDU会话1，并且使用SSC mode 3。由于UE移动，当前的UPF1无法继续为当前的PDU会话1服务，切换的目标UPF为UPF2。以当前5G网络为例描述，但不仅限制于此，还可以应用于其他类似功能的网络制式。如图5所示，所述UPF切换过程包括以下各个步骤。
步骤1，在SMF得知UPF1无法再为UE服务的情况下，执行新的UPF选择，即选择UPF2，获取UPF2的IP地址信息并指示UPF2建立新的N3隧道。
步骤2，SMF将PDU会话1的状态标记为重建状态，构造针对PDU会话1的标准信令Release Command，在其中的EPCO信元中携带UPF2的地址以及PDU1的剩余生命时间等信息，设置5GSM Cause IE信元的值为39，并将Release Command消息发送给UE。
步骤3，UE收到PDU会话1下的Release Command消息，若识别出5GSM cause IE的值为39，则获取EPCO中UPF2的地址、PDU1的剩余生命时间等信息。
步骤4，UE在PDU1的剩余生命时间内，根据UPF2的地址、PDU会话1的属性信息和QoS信息，在本地创建PDU会话2，并为PDU会 话2分配会话标识PDU ID2。
此时能够继续在PDU会话1上传输数据直到PDU1的剩余生命时间到达时结束。若UE成功创建PDU会话2，则执行步骤5，能够在PDU2会话上传输数据；若UE创建PDU会话2失败，则执行步骤5'。
步骤5，UE构造PDU会话1下的Release Complete消息，在其中的EPCO中携带新PDU ID2并发送至SMF。
步骤5'，UE本地释放PDU会话1的资源并构造Release Complete消息，在其中的EPCO中携带PDU会话1的会话标识PDU ID1并发送至SMF。
步骤6，SMF接收到Release Complete消息后，查看该Release Complete消息中的EPCO信元，获取并保存会话标识。若会话标识为PDU ID1，则SMF释放PDU会话2的资源；若会话标识为PDU ID2，则SMF更新PDU会话2为连接状态，并为PDU会话2提供会话管理功能。
此时，UE可以利用PDU会话2传输数据，实现UPF1到UPF2的切换。
本公开实施例能够有效避免UE和网络侧网元之间的两轮信令交换，不仅可以减少信令开销且缩短了PDU会话重建过程中引入的服务中断。
与相关技术方案相比，本公开实施例利用标准信令，改变PDU会话的重建流程达到缩短会话锚点切换时引入较大信令开销及时延的目的，避免提高网络对终端的服务连续性要求，并且利用现有设备及硬件进行L3NAS层协议软件升级即可实现。
基于相同的技术构思，本公开实施例还提供一种UPF切换装置，所述UPF切换装置可以应用于SMF，如图6所示，所述UPF切换装置包括选择模块101、发送模块102、接收模块103和处理模块104。
选择模块101用于在第一PDU会话对应的第一UPF无法为UE提供服务的情况下，选择第二UPF，获取所述第二UPF的地址，并指示所述第二UPF建立N3隧道，其中，所述第一PDU会话为当前的PDU会话，所述第二UPF为切换的目标UPF并且对应第二PDU会话。
发送模块102用于向所述UE发送重建通知消息，所述重建通知消息中携带有所述第二UPF的地址和用于指示所述UE重建PDU会话的会话重建标记。
接收模块103用于接收所述UE发送的重建响应消息，获取其中携带的会话标识。
处理模块104用于当根据所述会话标识确定所述UE已完成会话重建时，为所述第二PDU会话提供会话管理功能。
在一些实施例中，所述重建通知消息的SM Cause信元携带所述会话重建标记。
在一些实施例中，所述重建通知消息中还携带有所述第一UPF的剩余生命时间和/或所述第二PDU会话的QoS信息。
在一些实施例中，所述重建通知消息的EPCO信元携带以下至少一种信息：所述第二UPF的地址、所述第一UPF的剩余生命时间、所述第二PDU会话的QoS信息。
在一些实施例中，接收模块103用于获取所述重建响应消息EPCO信元中携带的会话标识。
在一些实施例中，处理模块104用于在所述会话标识不是所述第一PDU会话的标识的情况下，确定所述UE已完成会话重建。
在一些实施例中，如图7所示，所述UPF切换装置还包括资源释放模块105，用于在获取重建响应消息中携带的会话标识之后，在所述会话标识为所述第一PDU会话的标识的情况下，释放所述第二PDU会话的资源。
在一些实施例中，如图8所示，所述UPF切换装置还包括状态更新模块106，用于在发送模块102向所述UE发送重建通知消息之前，将所述第一PDU会话的状态从连接状态更新为重建状态；以及在接收模块103接收所述UE发送的重建响应消息之后，当根据所述重建响应消息中携带的会话标识确定所述用户终端已完成会话重建时，将所述第二PDU会话的状态设置为连接状态。
基于相同的技术构思，本公开实施例还提供一种UE，如图9所示，所述UE包括接收模块201、获取模块202、会话重建模块203 和发送模块204。
接收模块201用于接收SMF发送的重建通知消息，所述重建通知消息是所述SMF在确定出第一PDU会话对应的第一UPF无法为用户终端提供服务的情况下发送的，所述第一PDU会话为当前的PDU会话。
获取模块202用于当从所述重建通知消息中获取到会话重建标记时，从所述重建通知消息中获取第二UPF的地址，所述第二UPF为切换的目标UPF并且对应第二PDU会话。
会话重建模块203用于至少根据所述第一PDU会话的属性信息和所述第二UPF的地址在本地重建第二PDU会话。
发送模块204用于根据所述第二PDU会话重建结果确定会话标识，并向所述SMF发送携带有所述会话标识的重建响应消息，所述会话标识为所述第一PDU会话的标识或所述第二PDU会话的标识。
在一些实施例中，获取模块202还用于当从所述重建通知消息中获取到会话重建标记时，从所述重建通知消息中获取所述第二PDU会话的QoS信息。
会话重建模块203还用于，根据所述第一PDU会话的属性信息、所述第二UPF的地址和所述第二PDU会话的QoS信息在本地重建第二PDU会话。
在一些实施例中，获取模块202还用于，当从所述重建通知消息中获取到会话重建标记时，从所述重建通知消息中获取所述第一UPF的剩余生命时间。
会话重建模块203还用于，在所述第一UPF的剩余生命时间内，至少根据所述第一PDU会话的属性信息和所述第二UPF的地址在本地重建第二PDU会话。
在一些实施例中，获取模块202用于在从所述重建通知消息中获取到会话重建标记的情况下，从所述重建通知消息的EPCO信元中获取以下至少一种信息：所述第二UPF的地址、所述第一UPF的剩余生命时间、所述第二PDU会话的QoS信息。
在一些实施例中，获取模块202用于从所述重建通知消息的SMCause信元中获取到会话重建标记。
在一些实施例中，发送模块204用于在所述第二PDU会话重建成功的情况下，将所述会话标识设置为所述第二PDU会话的标识；在所述第二PDU会话重建失败的情况下，将所述会话标识设置为所述第一PDU会话的标识。
在一些实施例中，所述会话标识携带在所述重建响应消息的EPCO信元中。
本公开实施例还提供了一种计算机设备，该计算机设备包括：一个或多个处理器以及存储装置，其中，存储装置上存储有一个或多个程序，当上述一个或多个程序被上述一个或多个处理器执行时，使得上述一个或多个处理器实现如前述各实施例所提供的UPF切换方法。
本公开实施例还提供了一种计算机可读介质，其上存储有计算机程序，其中，该计算机程序被执行时实现如前述各实施例所提供的UPF切换方法。
本领域普通技术人员可以理解，上文中所公开方法中的全部或某些步骤、装置中的功能模块/单元可以被实施为软件、固件、硬件及其适当的组合。在硬件实施方式中，在以上描述中提及的功能模块/单元之间的划分不一定对应于物理组件的划分；例如，一个物理组件可以具有多个功能，或者一个功能或步骤可以由若干物理组件合作执行。某些物理组件或所有物理组件可以被实施为由处理器，如中央处理器、数字信号处理器或微处理器执行的软件，或者被实施为硬件，或者被实施为集成电路，如专用集成电路。这样的软件可以分布在计算机可读介质上，计算机可读介质可以包括计算机存储介质(或非暂时性介质)和通信介质(或暂时性介质)。如本领域普通技术人员公知的，术语计算机存储介质包括在用于存储信息(诸如计算机可读指令、数据结构、程序模块或其他数据)的任何方法或技术中实施的易失性和非易失性、可移除和不可移除介质。计算机存储介质包括但不限于RAM、ROM、EEPROM、闪存或其他存储器技术、CD-ROM、数字多功能盘(DVD)或其他光盘存储、磁盒、磁带、磁盘存储或其他磁存储装置、或者可以用于存储期望的信息并且可以被计算机访问的任何 其他的介质。此外，本领域普通技术人员公知的是，通信介质通常包含计算机可读指令、数据结构、程序模块或者诸如载波或其他传输机制之类的调制数据信号中的其他数据，并且可包括任何信息递送介质。
本文已经公开了示例实施例，并且虽然采用了具体术语，但它们仅用于并仅应当被解释为一般说明性含义，并且不用于限制的目的。在一些实例中，对本领域技术人员显而易见的是，除非另外明确指出，否则可单独使用与特定实施例相结合描述的特征、特性和/或元素，或可与其他实施例相结合描述的特征、特性和/或元件组合使用。因此，本领域技术人员将理解，在不脱离由所附的权利要求阐明的本发明的范围的情况下，可进行各种形式和细节上的改变。

Claims (15)

  1. 一种用户面功能实体UPF切换方法，应用于会话管理功能实体SMF，所述方法包括：
    在第一协议数据单元PDU会话对应的第一UPF无法为用户终端UE提供服务的情况下，选择第二UPF，获取所述第二UPF的地址，并指示所述第二UPF建立N3隧道，其中，所述第一PDU会话为当前的PDU会话，所述第二UPF为切换的目标UPF并且对应第二PDU会话；
    向所述UE发送重建通知消息，所述重建通知消息中携带有所述第二UPF的地址和用于指示所述UE重建PDU会话的会话重建标记；
    接收所述UE发送的重建响应消息，获取所述重建响应消息中携带的会话标识；
    当根据所述会话标识确定所述UE已完成会话重建时，为所述第二PDU会话提供会话管理功能。
  2. 如权利要求1所述的方法，其中，所述重建通知消息中还携带有所述第一UPF的剩余生命时间和/或所述第二PDU会话的服务质量QoS信息。
  3. 如权利要求2所述的方法，其中，所述重建通知消息的扩展协议配置选项EPCO信元携带以下至少一种信息：
    所述第二UPF的地址、所述第一UPF的剩余生命时间、所述第二PDU会话的QoS信息。
  4. 如权利要求1所述的方法，其中，根据所述会话标识确定所述UE已完成会话重建包括：
    在所述会话标识不是所述第一PDU会话的标识的情况下，确定所述UE已完成会话重建。
  5. 如权利要求1所述的方法，其中，在获取所述重建响应消息 中携带的会话标识之后，所述方法还包括：
    在所述会话标识为所述第一PDU会话的标识的情况下，释放所述第二PDU会话的资源。
  6. 如权利要求1-5任一项所述的方法，其中，在向所述UE发送重建通知消息之前，所述方法还包括：
    将所述第一PDU会话的状态从连接状态更新为重建状态；
    在接收所述UE发送的重建响应消息之后，所述方法还包括：
    当根据所述重建响应消息中携带的会话标识确定所述UE已完成会话重建时，将所述第二PDU会话的状态设置为连接状态。
  7. 一种用户面功能实体UPF切换方法，应用于用户终端UE，所述方法包括：
    接收会话管理功能实体SMF发送的重建通知消息，所述重建通知消息是所述SMF在确定出第一协议数据单元PDU会话对应的第一UPF无法为所述UE提供服务的情况下发送的，所述第一PDU会话为当前的PDU会话；
    当从所述重建通知消息中获取到会话重建标记时，从所述重建通知消息中获取第二UPF的地址，所述第二UPF为切换的目标UPF并且对应第二PDU会话；
    至少根据所述第一PDU会话的属性信息和所述第二UPF的地址在本地重建第二PDU会话；
    根据所述第二PDU会话重建结果确定会话标识，并向所述SMF发送携带有所述会话标识的重建响应消息，所述会话标识为所述第一PDU会话的标识或所述第二PDU会话的标识。
  8. 如权利要求7所述的方法，还包括：
    当从所述重建通知消息中获取到会话重建标记时，从所述重建通知消息中获取所述第二PDU会话的服务质量QoS信息；
    至少根据所述第一PDU会话的属性信息和所述第二UPF的地址 在本地重建第二PDU会话包括：
    根据所述第一PDU会话的属性信息、所述第二UPF的地址和所述第二PDU会话的QoS信息在本地重建第二PDU会话。
  9. 如权利要求7或8所述的方法，还包括：
    当从所述重建通知消息中获取到会话重建标记时，从所述重建通知消息中获取所述第一UPF的剩余生命时间；
    至少根据所述第一PDU会话的属性信息和所述第二UPF的地址在本地重建第二PDU会话包括：
    在所述第一UPF的剩余生命时间内，至少根据所述第一PDU会话的属性信息和所述第二UPF的地址在本地重建第二PDU会话。
  10. 如权利要求9所述的方法，其中，在从所述重建通知消息中获取到会话重建标记的情况下，从所述重建通知消息的扩展协议配置选项EPCO信元中获取以下至少一种信息：
    所述第二UPF的地址、所述第一UPF的剩余生命时间、所述第二PDU会话的QoS信息。
  11. 如权利要求7所述的方法，其中，根据所述第二PDU会话重建结果确定会话标识包括：
    在所述第二PDU会话重建成功的情况下，所述会话标识为所述第二PDU会话的标识；
    在所述第二PDU会话重建失败的情况下，所述会话标识为所述第一PDU会话的标识。
  12. 一种用户面功能实体UPF切换装置，应用于会话管理功能实体SMF，包括：选择模块、发送模块、接收模块和处理模块，
    所述选择模块用于在第一协议数据单元PDU会话对应的第一UPF无法为用户终端UE提供服务的情况下，选择第二UPF，获取所述第二UPF的地址，并指示所述第二UPF建立N3隧道，其中，所述第 一PDU会话为当前的PDU会话，所述第二UPF为切换的目标UPF并且对应第二PDU会话；
    所述发送模块用于向所述UE发送重建通知消息，所述重建通知消息中携带有所述第二UPF的地址和用于指示所述UE重建PDU会话的会话重建标记；
    所述接收模块用于接收所述UE发送的重建响应消息，获取其中携带的会话标识；
    所述处理模块用于当根据所述会话标识确定所述UE已完成会话重建时，为所述第二PDU会话提供会话管理功能。
  13. 一种用户终端UE，包括：接收模块、获取模块、会话重建模块和发送模块，
    所述接收模块用于接收会话管理功能实体SMF发送的重建通知消息，所述重建通知消息是所述SMF在确定出第一协议数据单元PDU会话对应的第一用户面功能实体UPF无法为所述UE提供服务的情况下发送的，所述第一PDU会话为当前的PDU会话；
    所述获取模块用于当从所述重建通知消息中获取到会话重建标记时，从所述重建通知消息中获取第二UPF的地址，所述第二UPF为切换的目标UPF并且对应第二PDU会话；
    所述会话重建模块用于至少根据所述第一PDU会话的属性信息和所述第二UPF的地址在本地重建第二PDU会话；
    所述发送模块用于根据所述第二PDU会话重建结果确定会话标识，并向所述SMF发送携带有所述会话标识的重建响应消息，所述会话标识为所述第一PDU会话的标识或所述第二PDU会话的标识。
  14. 一种计算机设备，包括：
    一个或多个处理器；
    存储装置，其上存储有一个或多个程序；
    当所述一个或多个程序被所述一个或多个处理器执行时，使得所述一个或多个处理器实现如权利要求1-11任一项所述的UPF切换 方法。
  15. 一种计算机可读介质，其上存储有计算机程序，其中，所述程序被执行时实现如权利要求1-11任一项所述的UPF切换方法。
PCT/CN2023/101505 2022-06-29 2023-06-20 用户面功能实体切换方法、装置、计算机设备及计算机可读介质 WO2024001890A1 (zh)

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