WO2023116338A1 - N2切换的实现方法、会话管理功能网元、网络设备和介质 - Google Patents

N2切换的实现方法、会话管理功能网元、网络设备和介质 Download PDF

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WO2023116338A1
WO2023116338A1 PCT/CN2022/134128 CN2022134128W WO2023116338A1 WO 2023116338 A1 WO2023116338 A1 WO 2023116338A1 CN 2022134128 W CN2022134128 W CN 2022134128W WO 2023116338 A1 WO2023116338 A1 WO 2023116338A1
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Prior art keywords
network element
handover
location information
pcf
amf
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English (en)
French (fr)
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王翠钟
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/14—Mobility data transfer between corresponding nodes

Definitions

  • the embodiments of the present application relate to the field of mobile communication technologies, and in particular to a method for implementing N2 handover, a network element with a session management function, network equipment and media.
  • N2 handover is the source next generation radio access network (Source Next Generation Radio Access Network, S-NG) when there is no Xn port between two NG-RANs -RAN) sends the handover request to the core network through the N2 port, and helps handover to the target next generation radio access network (T-NG-RAN) through the core network, which is suitable for terminals with large changes in location Handover, such as inter-
  • N2 handover is usually implemented in two phases: handover preparation and handover execution, where handover preparation is mainly the S-NG-RAN, T-NG-RAN, AMF, session management function (Session Management Function, SMF) network elements, policy control function (Policy Control Function, PCF) network elements, user plane function (User Plane Function, UPF) network elements, etc.
  • handover preparation is mainly the S-NG-RAN, T-NG-RAN, AMF, session management function (Session Management Function, SMF) network elements, policy control function (Policy Control Function, PCF) network elements, user plane function (User Plane Function, UPF) network elements, etc.
  • SMF Session Management Function
  • PCF Policy Control Function
  • UPF User Plane Function
  • the N2 handover can be canceled during the handover preparation phase, so that the target side of the handover can release the N2 handover.
  • the allocated resources allow the switch to return to the state before the switch.
  • the main purpose of the embodiment of the present application is to propose a method for implementing N2 handover, a session management function network element, network equipment, and media, aiming at improving the process of implementing N2 handover, so that when N2 handover is canceled, the need for The rollback operation simplifies the N2 switching cancellation process and reduces the difficulty of implementation.
  • the embodiment of the present application provides an implementation method of N2 handover, which is applied to the SMF network element with the session management function, including: receiving the handover request sent by the T-AMF network element with the target access and mobility management function, and the The handover request carries the location information of the user terminal UE; after receiving the handover completion message sent by the T-AMF network element, the location information is sent to the policy control function PCF network element for the PCF network element to The above location information determines the control strategy delivered to the user plane function UPF network element.
  • the embodiment of the present application also proposes a session management function network element, including: a receiving module, configured to receive a handover request sent by a target access and mobility management function T-AMF network element, the handover request Carrying the location information of the user terminal UE; the sending module is used to send the location information to the policy control function PCF network element after receiving the handover completion message sent by the T-AMF network element for the PCF network element According to the location information, the control strategy delivered to the user plane function UPF network element is determined.
  • a session management function network element including: a receiving module, configured to receive a handover request sent by a target access and mobility management function T-AMF network element, the handover request Carrying the location information of the user terminal UE; the sending module is used to send the location information to the policy control function PCF network element after receiving the handover completion message sent by the T-AMF network element for the PCF network element According to the location information, the control strategy delivered to the user plane function UPF network element is determined.
  • an embodiment of the present application also provides a network device, the device includes: at least one processor; and a memory connected to the at least one processor in communication; wherein, the memory stores information that can be accessed by An instruction executed by the at least one processor, the instruction being executed by the at least one processor, so that the at least one processor can execute the method for implementing N2 switching as described in any one of the above.
  • the embodiment of the present application further provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the implementation method for N2 switching as described in any one of the preceding items is implemented.
  • the SMF network element after receiving the handover request sent by the T-AMF network element, the SMF network element waits for the handover completion message sent by the T-AMF network element, and then sends the T-AMF network element
  • the location information of the UE carried in the handover request sent is sent to the policy control function PCF network element, so that the PCF network element determines the control policy delivered to the UPF network element according to the location information. That is to say, it does not report to the PCF network element during the handover, and does not directly send the UE location information carried in the handover request sent by the T-AMF network element to the PCF network after receiving the handover request sent by the T-AMF network element.
  • the SMF network element reports the location information of the UE to the PCF only after the entire N2 handover is completed. Therefore, since the SMF network element does not send the UE location information to the PCF network element during the handover, it will not trigger the PCF network element to issue a new control policy process, and the SMF network element will not use the new control policy to replace the original In addition, the SMF network element does not need to request the original control strategy from the PCF network element and re-issue the original control strategy to the UPF network element when the N2 handover needs to be canceled.
  • the strategy that is, the reduction of rollback process operations simplifies the N2 handover cancellation process and reduces the difficulty of implementation.
  • Fig. 1 is the flow chart of the implementation method of N2 handover provided in an embodiment of the present application
  • FIG. 2 is a schematic diagram of an application scenario of an implementation method of N2 handover provided by the present application
  • FIG. 3 is a flow chart of an implementation method of N2 switching including the step of reselecting a UPF provided in another embodiment of the present application;
  • FIG. 4 is a flow chart of a method for implementing N2 switching including the step of accepting a control strategy provided in another embodiment of the present application;
  • FIG. 5 is a flowchart of a method for implementing N2 handover including the step of receiving handover cancellation provided in another embodiment of the present application;
  • FIG. 6 is a schematic structural diagram of a network element device with a session management function provided in another embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of a network device provided in another embodiment of the present application.
  • the reason why the cancellation of N2 handover is complicated is that when the UE accesses 5GS, the PCF network element will send the trigger event (trigger event) of the UE's location information change to the SMF network element, that is, As long as the SMF network element determines that the location of the UE has changed, it needs to report the new location information to the PCF network element.
  • the trigger event trigger event
  • the SMF network element In the preparation stage for realizing N2 handover, after receiving the handover request sent by the T-AMF network element, the SMF network element will immediately report the location information of the UE carried in the handover request to the PCF network element, and then the PCF network element will The received location information sends a new control strategy, and the SMF network element will replace the original control strategy with the received control strategy after receiving the new control strategy issued by the PCF network element, that is, the issued historical control strategy strategy, and send the received control strategy to the selected UPF network element when switching preparations, so that the UPF network element can apply the new control strategy.
  • the original control strategy will be deleted when it is replaced by the new control strategy Lose.
  • Some control strategies that is, notify the UPF network element to stop applying the current control strategy, and inform the PCF network element that the user will return to the position before the switch, so that the PCF network element will issue the original control strategy based on the position before the switch, and then notify The original UPF network element applies the original control strategy.
  • the embodiment of the present application provides an implementation method of N2 handover, which is applied to the SMF network element with the session management function, including: receiving the handover request sent by the T-AMF network element with the target access and mobility management function, so The handover request message carries the location information of the user terminal UE; after receiving the handover completion message sent by the T-AMF network element, the location information is sent to the policy control function PCF network element for the PCF network element to follow The location information determines the control strategy delivered to the user plane function UPF network element.
  • the SMF network element after receiving the handover request sent by the T-AMF network element, the SMF network element temporarily stores the new location information of the UE locally in the SMF, and waits to receive the handover request sent by the T-AMF network element.
  • the location information of the UE carried in the handover request sent by the T-AMF network element is sent to the policy control function PCF network element, and the PCF network element determines the control strategy sent to the UPF network element according to the location information.
  • the SMF network element does not report to the PCF network element during the handover, and does not directly send the UE location information carried in the handover request sent by the T-AMF network element to the PCF network after receiving the handover request sent by the T-AMF network element.
  • the SMF network element reports the location information of the UE to the PCF network element only after the entire N2 handover is completed.
  • the SMF network element since the SMF network element does not send the UE location information to the PCF network element during the handover, it will not trigger the PCF network element to issue a new control policy process, and the SMF network element will not use the new control policy to replace the original In addition, when the N2 handover needs to be canceled, the SMF network element does not need to request the original control policy from the PCF network element, and re-issue the original control policy to the UPF network element.
  • the control strategy that is, the reduction of the fallback process operations, simplifies the N2 switching cancellation process and reduces the difficulty of implementation.
  • the embodiments of the present application provide a method for implementing N2 handover, which is applied to an SMF network element.
  • the flow of the implementation method of N2 handover at least includes the following steps:
  • Step 101 receiving a handover request sent by a target access and mobility management function T-AMF network element, and requesting that the service provision message carry the location information of the user terminal UE.
  • N2 handover usually occurs when the location of the terminal changes greatly, such as across provinces. For example, as shown in Figure 2, the current location of terminal 1 is within the coverage of NG-RAN1, and the area to be visited is within the coverage of NG-RAN2.
  • NG-RAN1 and AMF1 network elements are connected based on the N2 interface, and NG-RAN2 The AMF2 network element is also connected based on the N2 interface, and Terminal 1 needs to perform N2 handover to switch from NG-RAN1 to NG-RAN2.
  • the handover request is an Nsmf_PDUSession_UpdateSMContext message, thereby notifying the SMF network element to update the session management (Session Management, SM) context, and the information carried includes indicating a protocol data unit (Protocol Data Unit, PDU) session candidate for N2 handover PDU Session ID, Target ID provided by S-NG-RAN, T-AMF ID and N2SM Information used to indicate T-AMF, etc.
  • PDU Protocol Data Unit
  • TAC Tracking Area Code
  • TAC Tracking Area Code
  • the S-NG-RAN when the S-NG-RAN detects that the UE is moving towards the T-NG-RAN, when the UE is about to leave the coverage area of the S-NG-RAN, the S-NG-RAN will send a request to the source access and mobility management function (Source Access and Mobility Management Function, S-AMF) network element initiates a handover request, and the handover request will carry T-NG-RAN information; then, the S-AMF network element carries the T- After the NG-RAN information fails to be searched in its associated NG-RAN, it turns to the corresponding (Target Access and Mobility Management Function, T-AMF) of the T-NG-RAN; after finding the T-AMF network element, the S- The AMF network element will send the Namf_Communication_CreateUEContext message to the T-AMF network element, thereby triggering the process of the T-AMF network element sending the Nsmf_PDUSession_UpdateSMContext message to the SMF network element, so that the S
  • the location information carried in the handover request is used to indicate the area that the UE will reach, not the current location. Taking the scenario shown in Figure 2 as an example, the location information carried in the handover request is located in the coverage area of NG-RAN2 , not in the coverage area of NG-RAN1.
  • Step 102 after receiving the handover completion message sent by the T-AMF network element, send the location information to the policy control function PCF network element, for the PCF network element to determine the control strategy issued to the user plane function UPF network element according to the location information .
  • the implementation method of N2 handover further includes: temporarily storing the location information. Therefore, after receiving the handover completion message sent by the T-AMF network element, the temporarily stored location information is sent to the policy control function PCF network element.
  • This embodiment mainly emphasizes that the original SMF network element sends the location information of the UE to the PCF network element for improvement after receiving the handover request: after receiving the handover completion message sent by the T-AMF network element, the SMF network element Send the location information of the UE to the PCF network element, and trigger the process of delivering the control policy.
  • the rest of the process is roughly the same as that stipulated in the existing 23.502 agreement.
  • N2 handover In order to facilitate those skilled in the art to better understand the implementation method of N2 handover provided in this embodiment, the following will include the process and execution phase included in the preparation phase after the SMF network element receives the handover request sent by the T-AMF network element The process before receiving the handover completion message sent by the T-AMF network element is explained.
  • the SMF network element may also include the following steps: the SMF network element judges whether the UE location information carried in the handover request sent by the T-AMF network element is within the original If it is not within the coverage of the UPF network element, the SMF network element will re-select the UPF network element. If the result of reselecting the UPF network element is that an intermediate user plane function (Intermediate User Plane Function, I-UPF) network element needs to be inserted, then the SMF network element needs to serve as the protocol data unit session anchor (Protocol Data Unit).
  • I-UPF Intermediate User Plane Function
  • the UPF network element of Session Anchor sends an N4 session update request, requesting the PSA network element to allocate an N9 tunnel, and then the PSA network element returns the allocated N9 tunnel information through the N4 session update response message, and the SMF network element sends the I-UPF network
  • the element sends an N4 session creation request, requesting it to allocate N3 and N9 tunnel information
  • the I-UPF network element sends an N4 session creation response to the SMF network element, returns the allocated N3 and N9 tunnel information
  • the SMF network element sends the AMF network element
  • the Nsmf_PDUSession_UpdateSMContext response message wherein the Nsmf_PDUSession_UpdateSMContext response message carries the N3 tunnel information allocated by the UPF network element connected to the T-NG-RAN, and the T-AMF network element checks the response message returned by the SMF network element, and then the T-AMF network element Send a handover request to T-NG-RAN.
  • T-NG-RAN After receiving the handover request sent by the T-AMF network element, T-NG-RAN sends a handover request confirmation message to the T-AMF network element, wherein the handover request confirmation message carries T- The relevant resources allocated by NG-RAN for N2 handover; thus, the T-AMF network element will send the Nsmf_PDUSession_UpdateSMContext message to the SMF network element, where the Nsmf_PDUSession_UpdateSMContext message carries the relevant resources allocated by T-NG-RAN for N2 handover, so that the SMF network element can T-NG-RAN configures related resources allocated for N2 handover, especially to create tunnels for UPF network elements.
  • SMF network elements send to the target user plane function (Target User Plane Function, The T-UPF network element sends an N4 session update request to request the allocation of non-direct transmission tunnels, the T-UPF network element returns the allocated non-direct transmission tunnel information through the N4 session update response, and the SMF network element sends the source user plane function (Source User Plane Function, S-UPF) network element sends an N4 session update request, wherein, the N4 session update request carries the non-direct transmission tunnel information allocated by the T-UPF network element, to request the S-UPF network element to allocate a non-direct transmission tunnel; S - The UPF network element returns the assigned non-direct tunnel information through the N4 session update response; the SMF network element sends the Nsmf_PDUSession_UpdateSMContext response message to the T-AMF network element.
  • target user plane function Target User Plane Function
  • S-UPF Source User Plane Function
  • the Nsmf_PDUSession_UpdateSMContext response message contains Carries the non-direct transmission tunnel information allocated by the S-UPF network element. If the non-direct transmission tunnel is not created, the Nsmf_PDUSession_UpdateSMContext response message will carry the forwarding tunnel information allocated by the T-NG-RAN; the T-AMF network element sends the The S-AMF network element sends a Namf_Communication_CreateUEContext message carrying related resources allocated by the target side.
  • the process included in the execution phase before receiving the handover completion message sent by the T-AMF network element includes the following steps: the S-AMF network element sends a handover command to the S-NG-RAN; the S-NG-RAN sends a handover command to the UE; the S-AMF network element sends a handover command to the UE; -NG-RAN, S-AMF network element, T-AMF network element, T-NG-RAN, S-UPF network element, T-UPF network element interact with each other to realize status report and data forwarding; UE sends T- NG-RAN sends a handover confirmation message to notify T-NG-RAN that the handover is successful; then T-NG-RAN sends a handover notification message to the T-AMF network element to inform the T-AMF network element that the UE has been handed over; T-AMF network The S-AMF network element sends a Namf_Communication_N2InfoNotify message to the S-AMF network element to notify the S-
  • the S-AMF network element can set a timer to notify the S-NG-RAN to release resources; the S-AMF network element sends a message to the T-AMF network element.
  • the AMF network element sends a Namf_Communication_N2InfoNotify confirmation message; when the T-AMF network element does not accept the PDU session, the S-AMF network element sends a release session message to the SMF network element.
  • the T-AMF network element will send the Nsmf_PDUSession_UpdateSMContext message to the SMF network element, that is, the handover completion message, to notify the SMF network element that the handover is complete.
  • the SMF network element receives the handover completion message sent by the T-AMF network element, the following steps are also included: in the case that the re-selected UPF network element includes an I-UPF network element, the SMF network element will report to the T-AMF network element
  • the UPF network element sends the N4 session update message, carrying the N3 interface information allocated by T-NG-RAN, and requests the T-UPF network element to update the downlink of its N3 tunnel;
  • the T-UPF network element returns the N4 session update response;
  • -UPF network element, and the S-UPF network element remains unchanged during the handover then the SMF network element sends an N4 session update message to the S-UPF network element, carrying the N3 interface information allocated by T-NG-RAN, and requests the S-UPF network element Update the downlink of its N3 tunnel; insert a T-UPF network element or change an S-UPF network element, then the SMF network element sends an N4 session update message to the PSA network element,
  • the SMF network element in the handover preparation stage, does not report the location information of the UE to the PCF network element, and the PCF network element does not issue new rules. There are no new rules to be installed and no old rules to be deleted. Even if the UPF network element changes, only the I-UPF network element will change. When the switching is canceled, only the I-UPF network element needs to be deleted, which is much simpler to implement.
  • the SMF network element in the handover preparation stage, the SMF network element will normally report the new location of the terminal to the PCF network element, and the PCF network element will issue new rules and may also instruct to delete the original old rules.
  • the SMF network element will select new PSA network elements and I-UPF network elements according to the new rules, and instruct these UPF network elements to use the new rules and delete the old rules.
  • the handover is canceled, it is first necessary to inform the PCF network element that the terminal returns to the position before the handover, request the PCF network element to issue the rules before the handover, and delete the new rule at the same time, and the SMF network element must select the original one based on the previous position.
  • the UPF network element, reinstall the previous rules, etc., the implementation method of N2 handover provided in this embodiment does not need to notify the UPF network element to stop applying the current control strategy, and inform the PCF network element that the user will return to the position before the handover. Let the PCF network element issue the original control strategy based on the location before the handover, and then notify the original UPF network element to apply the original control strategy steps, which reduces the fallback process and reduces the difficulty of implementation.
  • the SMF network element Since the SMF network element does not send the UE location information to the PCF network element immediately after receiving the handover message sent by the T-AMF network element, during the implementation of the N2 handover, the SMF network element sends the UPF network element It is still the original control strategy, and the original control strategy is also used when selecting UPF network elements.
  • the embodiment of the present application also provides an implementation method of N2 handover, which is applied to the SMF network element.
  • the process of the implementation method of N2 handover includes at least the following steps:
  • Step 301 receiving a handover request sent by a network element with a target access and mobility management function T-AMF, and requesting that a service message carry location information of a user terminal UE.
  • Step 301 in this embodiment is substantially the same as step 101 in the first method embodiment, and will not be repeated here.
  • step 302 when it is detected that the location information is not within the coverage of the currently configured UPF network element, reselect the UPF network element according to the location information and the historical control policy issued by the PCF network element.
  • the implementation method of N2 handover further includes: sending the historical control strategy issued by the PCF network element to the reselected UPF network element Yuan.
  • the historical control policy delivered by the PCF network element refers to the control policy delivered by the PCF network element last time received by the SMF network element.
  • the PCF network element Since the SMF network element does not send the location information of the UE to the PCF network element immediately after receiving the handover request sent by the T-AMF network element, the PCF network element will not issue a new control strategy, and the original control strategy is used. Strategy. In this way, if it is necessary to cancel the handover, the control policy used is the original, and the PCF network element does not need to restore the control policy, and the rollback process is simpler.
  • Step 303 after receiving the handover completion message sent by the T-AMF network element, send the location information to the policy control function PCF network element, for the PCF network element to determine the control strategy issued to the user plane function UPF network element according to the location information .
  • Step 303 in this embodiment is substantially the same as step 102 in the first method embodiment, and will not be repeated here.
  • the PCF network element Since the SMF network element does not send the location information of the UE to the PCF network element immediately after receiving the handover request sent by the T-AMF network element, the PCF network element will not issue a new control strategy, and the original control strategy is used. Strategy. After the handover is completed, the control strategy on the UPF network element is the original control strategy, which may not match the location information of the UE. It is necessary to re-determine the control strategy applied on the UPF network element based on the location information of the UE.
  • the embodiment of the present application also provides an implementation method of N2 handover, which is applied to the SMF network element.
  • the process of the implementation method of N2 handover includes at least the following steps:
  • Step 401 receiving a handover request sent by a target access and mobility management function T-AMF network element, and requesting that a service message carry location information of a user terminal UE.
  • Step 401 in this embodiment is substantially the same as step 101 in the first method embodiment, and will not be repeated here.
  • Step 402 after receiving the handover completion message sent by the T-AMF network element, send the location information to the policy control function PCF network element, for the PCF network element to determine the control strategy issued to the user plane function UPF network element according to the location information .
  • Step 402 in this embodiment is substantially the same as step 102 in the first method embodiment, and will not be repeated here.
  • Step 403 receiving the control strategy issued by the PCF network element according to the location information.
  • This embodiment mainly describes the situation that the control strategy needs to be updated.
  • the PCF network element may still use the original control strategy, that is, In other embodiments, the PCF network element may not deliver the control policy because the control policy corresponding to the location information of the UE is not yet the original control policy.
  • Step 404 forward the received control policy to the corresponding UPF network element.
  • the SMF needs to forward the received control policy to the corresponding UPF network element, so that the control policy applied on the UPF network element can adapt to the location information of the UE.
  • N2 handover may be canceled, ie subject to a handover cancellation request before the handover is completed.
  • the embodiment of the present application provides an implementation method of N2 handover, which is applied to the SMF network element.
  • the process of the implementation method of N2 handover includes at least the following steps:
  • Step 501 Receive a handover request sent by a network element with a target access and mobility management function T-AMF, and request a service message to carry location information of a user terminal UE.
  • Step 501 in this embodiment is substantially the same as step 101 in the first method embodiment, and will not be repeated here.
  • Step 502 receiving a handover cancellation request.
  • the handover cancellation process is usually initiated by the S-NG-RAN, and transmitted to the SMF network element through other intermediate devices such as the T-AMF network element, and will not be described here.
  • the handover cancellation request is usually initiated in the handover preparation phase, that is, before the completion of the handover is determined, that is, the handover cancellation request is sent before the SMF network element sends the UE location information to the PCF network element.
  • the handover preparation phase that is, before the completion of the handover is determined
  • the handover cancellation request is sent before the SMF network element sends the UE location information to the PCF network element.
  • steps such as requesting the original control policy from the PCF network element and re-delivering the original control policy to the UPF network element are not required, which simplifies the N2 handover cancellation process and reduces implementation difficulty.
  • Step 503 release the resources configured for the handover request and delete the location information according to the handover cancellation request.
  • the embodiment of the present application also provides a network element with a session management function, as shown in FIG. 6 , including:
  • the receiving module 601 is configured to receive a handover request sent by a target access and mobility management function T-AMF network element, where the handover request carries location information of a user terminal UE.
  • the sending module 602 is configured to send the location information to the policy control function PCF network element after receiving the handover completion message sent by the T-AMF network element, so that the PCF network element can determine and send it to the user plane function UPF network element according to the location information control strategy.
  • This embodiment is an apparatus embodiment corresponding to the method embodiment, and this embodiment can be implemented in cooperation with the method embodiment.
  • the relevant technical details mentioned in the method embodiments are still valid in this embodiment, and will not be repeated here in order to reduce repetition.
  • the related technical details mentioned in this embodiment can also be applied in the method embodiment.
  • modules involved in this embodiment are logical modules.
  • a logical unit may be a physical unit, or a part of a physical unit, or may be realized by a combination of multiple physical units.
  • units that are not closely related to solving the technical problem proposed in the present application are not introduced in this embodiment, but this does not mean that there are no other units in this embodiment.
  • FIG. 7 Another aspect of the embodiment of the present application provides a network device, as shown in FIG. 7 , including: at least one processor 701; and a memory 702 communicatively connected to the at least one processor 701; An instruction to be executed by at least one processor 701, the instruction is executed by at least one processor 701, so that at least one processor 701 can execute the implementation method of N2 switching described in any of the foregoing method embodiments.
  • the memory 702 and the processor 701 are connected by a bus, and the bus may include any number of interconnected buses and bridges, and the bus connects one or more processors 701 and various circuits of the memory 702 together.
  • the bus may also connect together various other circuits such as peripherals, voltage regulators, and power management circuits, all of which are well known in the art and therefore will not be further described herein.
  • the bus interface provides an interface between the bus and the transceivers.
  • a transceiver may be a single element or multiple elements, such as multiple receivers and transmitters, providing means for communicating with various other devices over a transmission medium.
  • the data processed by the processor 701 is transmitted on the wireless medium through the antenna, and further, the antenna also receives the data and transmits the data to the processor 701 .
  • the processor 701 is responsible for managing the bus and general processing, and may also provide various functions including timing, peripheral interface, voltage regulation, power management and other control functions. And the memory 702 may be used to store data used by the processor 701 when performing operations.
  • Another aspect of the embodiment of the present application provides a computer-readable storage medium storing a computer program.
  • the computer program is executed by the processor, the implementation method of N2 switching described in any one of the above method embodiments is implemented.
  • a storage medium includes several instructions to make a device ( It may be a single-chip microcomputer, a chip, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc., which can store program codes. .

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Abstract

本申请实施例涉及移动通信技术领域，公开了一种N2切换的实现方法、会话管理功能网元、网络设备和介质。N2切换的实现方法，应用于会话管理功能SMF网元，包括：接收目标接入和移动性管理功能T-AMF网元发送的切换请求，所述切换请求携带用户终端UE的位置信息；在接收到所述T-AMF网元发送的切换完成消息后，将所述位置信息发送给策略控制功能PCF网元，供所述PCF网元根据所述位置信息确定下发给用户面功能UPF网元的控制策略。

Description

N2切换的实现方法、会话管理功能网元、网络设备和介质
相关申请
本申请要求于2021年12月24日申请的、申请号为202111599665.5的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及移动通信技术领域，特别涉及一种N2切换的实现方法、会话管理功能网元、网络设备和介质。
背景技术
在第五代移动通信技术系统(5th Generation Mobile Communication Technology System，5GS)下，当终端在两个下一代无线接入网络(Next Generation Radio Access Network，NG-RAN)间移动时，就会触发NG-RAN间的切换流程。根据第三代合作伙伴计划(3rd Generation Partnership Project，3GPP)23.502协议的描述，NG-RAN间的切换分为基于Xn的NG-RAN节点间切换和基于N2的NG-RAN节点间切换(Inter NG-RAN node N2based handover，简称N2切换)两种，其中，N2切换是在两个NG-RAN间没有Xn口的情况下，源下一代无线接入网络(Source Next Generation Radio Access Network，S-NG-RAN)通过N2口将切换请求发送给核心网，通过核心网帮忙切换到目标下一代无线接入网络(Target Next Generation Radio Access Network，T-NG-RAN)，适用于终端位置变化较大的切换，例如跨省场景下的NG-RAN间切换，且支持访问和移动性管理功能(Access and Mobility Management Function，AMF)改变。特别地，N2切换通常被分为切换准备和切换执行两个阶段实现，其中，切换准备主要是参与切换的S-NG-RAN、T-NG-RAN、AMF、会话管理功能(Session Management Function，SMF)网元、策略控制功能(Policy Control Function，PCF)网元、用户平面功能(User Plane Function，UPF)网元等为切换到T-NG-RAN进行准备工作，创建相关资源，执行阶段主要是当准备工作完成后，通知用户终端(User Equipment，UE)执行切换，特别地，根据3GPP 23.502协议的规定，N2切换可以在切换准备阶段被取消，让切换的目标侧释放为进行N2切换所分配的资源，让切换重新回到切换前的状态。
然而，为了让T-NG-RAN侧恢复到切换前的状态，需要对已完成的各类切换准备操作进行回退，实现起来非常复杂。
发明内容
本申请实施例的主要目的在于提出一种N2切换的实现方法、会话管理功能网元、网络设备和介质，旨在实现对N2切换实现的流程进行改进，使得在N2切换被取消时，减少需要回退的操作，简化N2切换取消流程，降低实现难度。
为实现上述目的，本申请实施例提供了一种N2切换的实现方法，应用于会话管理功能SMF网元，包括：接收目标接入和移动性管理功能T-AMF网元发送的切换请求，所述切换请求携带用户终端UE的位置信息；在接收到所述T-AMF网元发送的切换完成消息后，将所 述位置信息发送给策略控制功能PCF网元，供所述PCF网元根据所述位置信息确定下发给用户面功能UPF网元的控制策略。
为实现上述目的，本申请实施例还提出了一种会话管理功能网元，包括：接收模块，用于接收目标接入和移动性管理功能T-AMF网元发送的切换请求，所述切换请求携带用户终端UE的位置信息；发送模块，用于在接收到所述T-AMF网元发送的切换完成消息后，将所述位置信息发送给策略控制功能PCF网元，供所述PCF网元根据所述位置信息确定下发给用户面功能UPF网元的控制策略。
为实现上述目的，本申请实施例还提出了一种网络设备，所述设备包括：至少一个处理器；以及，与所述至少一个处理器通信连接的存储器；其中，所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行如上任意一项所述的N2切换的实现方法。
为实现上述目的，本申请实施例还提出了一种计算机可读存储介质，存储有计算机程序，所述计算机程序被处理器执行时实现如上任一项所述的N2切换的实现方法。
本申请实施例提出的N2切换的实现方法，SMF网元在接收到T-AMF网元发送的切换请求后，等待接收到T-AMF网元发送的切换完成消息，再将T-AMF网元发送的切换请求中携带的UE的位置信息发送给策略控制功能PCF网元，供PCF网元根据位置信息确定下发给UPF网元的控制策略。也就是说，在切换期间不上报给PCF网元，不是在接收到T-AMF网元发送的切换请求后直接将T-AMF网元发送的切换请求中携带的UE的位置信息发送给PCF网元，而是只有当整个N2切换完成后，SMF网元再向PCF上报UE的位置信息。从而由于在切换期间SMF网元没有向PCF网元发送UE的位置信息，就不会触发PCF网元下发新的控制策略的流程，SMF网元也就不会使用新的控制策略替换原有的控制策略以及向UPF下发新的控制策略，进而在需要取消N2切换的情况下，SMF网元不需要向PCF网元请求原有的控制策略、向UPF网元重新下发原有的控制策略，也就是回退流程操作减少，简化了N2切换取消流程，降低了实现难度。
附图说明
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定。
图1是本申请一实施例中提供的N2切换的实现方法的流程图；
图2是本申请提供的N2切换的实现方法的应用场景示意图；
图3是本申请另一实施例中提供的包括重新选择UPF步骤的N2切换的实现方法的流程图；
图4是本申请另一实施例中提供的包括接受控制策略步骤的N2切换的实现方法的流程图；
图5是本申请另一实施例中提供的包括接收切换取消步骤的N2切换的实现方法的流程图；
图6是本申请另一实施例中提供的会话管理功能网元装置的结构示意图；
图7是本申请另一实施例中提供的网络设备的结构示意图。
具体实施方式
由背景技术可知，目前的N2切换实现方式，若是在切换准备阶段需要取消N2切换，会有较多的回退流程操作，实现非常复杂。
经分析发现，导致N2切换的取消实现复杂的原因在于：在UE接入5GS时，PCF网元就会向SMF网元下发UE的位置信息改变的触发事件(trigger event)，也就是说，只要SMF网元判断出UE的位置发生了变化，就需要将新的位置信息上报给PCF网元。在实现N2切换的准备阶段，SMF网元在接收到T-AMF网元发送的切换请求后，会立刻将切换请求携带的UE的位置信息上报给PCF网元，然后PCF网元会基于当前接收到的位置信息下发新的控制策略，而SMF网元在接收到PCF网元下发的新的控制策略后，会使用接收到的控制策略替换原有的控制策略，即下发的历史控制策略，并在切换准备时将接收到控制策略下发给选择的UPF网元，以便UPF网元应用新的控制策略，特别地，原有的控制策略在被新的控制策略替换时会被删除掉。因此，一旦需要取消N2切换，那么为了让切换重新回到切换前的状态，所有新配置的资源都需要释放、所有改变的资源需要恢复到改变前状态，也就是说，SMF网元需要恢复原有的控制策略，即通知UPF网元停止应用当前的控制策略，以及告知PCF网元用户将回到切换前的位置，让PCF网元基于切换前的位置下发原有的控制策略，再通知原来的UPF网元应用原有的控制策略。
为解决上述问题，本申请实施例提供了一种N2切换的实现方法，应用于会话管理功能SMF网元，包括：接收目标接入和移动性管理功能T-AMF网元发送的切换请求，所述切换请求消息携带用户终端UE的位置信息；在接收到所述T-AMF网元发送的切换完成消息后，将所述位置信息发送给策略控制功能PCF网元，供所述PCF网元根据所述位置信息确定下发给用户面功能UPF网元的控制策略。
本申请实施例提出的N2切换的实现方法，SMF网元在接收到T-AMF网元发送的切换请求后，在SMF本地暂存UE新的位置信息，等待接收到T-AMF网元发送的切换完成消息后，再将T-AMF网元发送的切换请求中携带的UE的位置信息发送给策略控制功能PCF网元，供PCF网元根据位置信息确定下发给UPF网元的控制策略。也就是说，在切换期间不上报给PCF网元，不是在接收到T-AMF网元发送的切换请求后直接将T-AMF网元发送的切换请求中携带的UE的位置信息发送给PCF网元，而是只有当整个N2切换完成后，SMF网元再向PCF网元上报UE的位置信息。从而由于在切换期间SMF网元没有向PCF网元发送UE的位置信息，就不会触发PCF网元下发新的控制策略的流程，SMF网元也就不会使用新的控制策略替换原有的控制策略以及向UPF网元下发新的控制策略，进而在需要取消N2切换的情况下，SMF网元不需要向PCF网元请求原有的控制策略、向UPF网元重新下发原有的控制策略，也就是回退流程操作减少，简化了N2切换取消流程，降低了实现难度。
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本申请的各实施例进行详细的阐述。然而，本领域的普通技术人员可以理解，在本申请各实施例中，为了使读者更好地理解本申请而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施例的种种变化和修改，也可以实现本申请所要求保护的技术方案。以下各个实施例的划分是为了描述方便，不应对本申请的具体实现方式构成任何限定，各个实施例在不矛盾的前提下可以相互结合相互引用。
本申请实施例一方面提供了一种N2切换的实现方法，应用于SMF网元。如图1所示， N2切换的实现方法的流程至少包括以下步骤：
步骤101，接收目标接入和移动性管理功能T-AMF网元发送的切换请求，请求提供服务消息携带用户终端UE的位置信息。
N2切换通常发生在终端所处位置发生较大变动的情况，如跨省情况。例如，如图2所示，终端1当前所在位置位于NG-RAN1的覆盖范围内，将要前往的区域位于NG-RAN2的覆盖范围内，NG-RAN1与AMF1网元基于N2接口连接，NG-RAN2与AMF2网元也基于N2接口连接，终端1需要进行N2切换，以从NG-RAN1切换到NG-RAN2。
本实施例中，切换请求为Nsmf_PDUSession_UpdateSMContext消息，从而通知SMF网元更新会话管理(Session Management，SM)上下文，携带的信息包括指示用于N2切换的协议数据单元(Protocol Data Unit，PDU)会话候选者的PDU Session ID、由S-NG-RAN提供的Target ID、用于指示T-AMF的T-AMF ID和N2SM Information等。并且本实施例不对UE的位置信息的表示形式进行限定，可以是以跟踪区编码(Tracking Area Code，TAC)进行标识，也可以是地理位置信息的编码等，此处就不再一一赘述了。
在一些例子中，S-NG-RAN检测到UE在向T-NG-RAN移动，在UE即将离开S-NG-RAN的覆盖区域时，S-NG-RAN会向源访问和移动性管理功能(Source Access and Mobility Management Function，S-AMF)网元发起切换请求，该切换请求会携带T-NG-RAN的信息；然后，S-AMF网元在根据接收到的切换请求中携带的T-NG-RAN的信息在自身关联的NG-RAN中查找失败后，转向T-NG-RAN对应的(Target Access and Mobility Management Function，T-AMF)；在查找到T-AMF网元后，S-AMF网元会向T-AMF网元发送Namf_Communication_CreateUEContext消息，从而触发T-AMF网元向SMF网元发送Nsmf_PDUSession_UpdateSMContext消息的流程，使得SMF网元接收到T-AMF网元的切换请求。
切换请求携带的位置信息用于指示UE将要达到的区域，而非当前所处位置，以图2所示的场景为例，切换请求中携带的是位置信息指示的位置位于NG-RAN2的覆盖区域，而不是位于NG-RAN1的覆盖区域。
步骤102，在接收到T-AMF网元发送的切换完成消息后，将位置信息发送给策略控制功能PCF网元，供PCF网元根据位置信息确定下发给用户面功能UPF网元的控制策略。
本实施例中，在接收T-AMF网元发送的切换请求之后，将位置信息发送给策略控制功能PCF网元之前，N2切换的实现方法还包括：暂存位置信息。从而在接收到T-AMF网元发送的切换完成消息后，将暂存的位置信息发送给策略控制功能PCF网元。
此外，若是在PCF网元下发新的控制策略，则按照23.502描述的会话更新流程处理，此处就不再一一赘述了。
本实施例主要强调的是，原有的SMF网元接收到切换请求就向PCF网元发送UE的位置信息进行改进：在接收到T-AMF网元发送的切换完成消息后，SMF网元才向PCF网元发送UE的位置信息，触发下发控制策略的流程。其余流程与现有的23.502协议规定的流程大致相同。
为了便于本领域技术人员更好地理解本实施例提供的N2切换的实现方法，以下将对准备阶段包含的在SMF网元接收到T-AMF网元发送的切换请求之后的流程以及执行阶段包含的接收到T-AMF网元发送的切换完成消息前的流程进行解释说明。
准备阶段包含的在SMF网元接收到T-AMF网元发送的切换请求之后，还可以包括如下步骤：SMF网元判断T-AMF网元发送的切换请求中携带的UE的位置信息是否在原有的UPF网元的覆盖范围内，如果不在，则SMF网元会重新选择UPF网元。若是重新选择UPF网元的结果是需要再插入一个中继用户面功能(Intermediate User Plane Function，I-UPF)网元，则SMF网元需要向原来的充当协议数据单元会话锚点(Protocol Data Unit Session Anchor，PSA)的UPF网元发送N4会话更新请求，请求PSA网元分配N9隧道，接着PSA网元通过N4会话更新应答消息，返回分配的N9隧道信息，SMF网元再向I-UPF网元发送N4创建会话请求，请求其分配N3与N9隧道信息，I-UPF网元向SMF网元发送N4会话创建响应，返回分配的N3与N9隧道信息，再接着SMF网元向AMF网元发送Nsmf_PDUSession_UpdateSMContext应答消息，其中，Nsmf_PDUSession_UpdateSMContext应答消息携带与T-NG-RAN对接的UPF网元所分配的N3隧道信息，T-AMF网元对SMF网元返回的应答消息进行检查，然后T-AMF网元向T-NG-RAN发送切换请求，在接收到T-AMF网元发送的切换请求后，T-NG-RAN向T-AMF网元发送切换请求确认消息，其中，切换请求确认消息携带T-NG-RAN为N2切换分配的相关资源；从而T-AMF网元会向SMF网元发送Nsmf_PDUSession_UpdateSMContext消息，其中，Nsmf_PDUSession_UpdateSMContext消息携带T-NG-RAN为N2切换分配的相关资源，这样SMF网元可以对T-NG-RAN为N2切换分配的相关资源进行配置，特别是为UPF网元创建隧道，如在需要创建非直传隧道的情况下，SMF网元向目标用户平面功能(Target User Plane Function，T-UPF)网元发送N4会话更新请求，以请求分配非直传隧道，T-UPF网元通过N4会话更新应答，返回分配的非直传隧道信息，SMF网元向源用户平面功能(Source User Plane Function，S-UPF)网元发送N4会话更新请求，其中，N4会话更新请求携带T-UPF网元分配的非直传隧道信息，以请求S-UPF网元分配非直传隧道；S-UPF网元通过N4会话更新应答返回分配的非直传隧道信息；SMF网元向T-AMF网元发送Nsmf_PDUSession_UpdateSMContext应答消息，在已创建了非直传隧道的情况下，则Nsmf_PDUSession_UpdateSMContext应答消息里面会携带有S-UPF网元分配的非直传隧道信息，在未创建非直传隧道的情况下，Nsmf_PDUSession_UpdateSMContext应答消息里面会携带有T-NG-RAN分配的转发隧道信息；T-AMF网元向S-AMF网元发送携带有携带目标侧分配的相关资源的Namf_Communication_CreateUEContext消息。
执行阶段包含的接收到T-AMF网元发送的切换完成消息前的流程包括以下步骤：S-AMF网元向S-NG-RAN发送切换命令；S-NG-RAN向UE发送切换命令；S-NG-RAN、S-AMF网元、T-AMF网元、T-NG-RAN、S-UPF网元、T-UPF网元之间进行交互，实现状态报告以及数据转发；UE向T-NG-RAN发送切换确认消息，以通知T-NG-RAN切换成功；然后T-NG-RAN向T-AMF网元发送切换通知消息，告知T-AMF网元UE已经切换完成；T-AMF网元向S-AMF网元发送Namf_Communication_N2InfoNotify消息，通知S-AMF网元切换已经完成，S-AMF网元收到后可以设置定时器通知S-NG-RAN释放资源；S-AMF网元向T-AMF网元发送Namf_Communication_N2InfoNotify确认消息；在T-AMF网元不接受PDU会话的情况下，S-AMF网元向SMF网元发送释放会话消息。而在S-AMF网元向SMF网元发送释放会话消息后，T-AMF网元就会向SMF网元发送Nsmf_PDUSession_UpdateSMContext消息，即切换完成消息，以通知SMF网元切换完成。特别地，在SMF网元接收到T-AMF网元发送的切换完成消息后，还包括以下步骤：在重新选择的UPF网元包括I-UPF网元的情况下，SMF网元 会向T-UPF网元发送N4会话更新消息，携带T-NG-RAN分配的N3接口信息，请求T-UPF网元更新其N3隧道的下行；T-UPF网元返回N4会话更新响应；切换前就存在S-UPF网元，且切换时S-UPF网元不变，则SMF网元向S-UPF网元发送N4会话更新消息，携带T-NG-RAN分配的N3接口信息，请求S-UPF网元更新其N3隧道的下行；插入T-UPF网元或者改变S-UPF网元，则SMF网元向PSA网元发送N4会话更新消息，请求PSA网元更新N9隧道的下行；PSA网元返回N4会话更新响应；SMF网元向T-AMF网元发送Nsmf_PDUSession_UpdateSMContext响应，确认收到切换完成。
还有一些在以上内容并未描述到，并不意味着不存在，例如用于释放切换前使用，切换后不再需要使用的资源的流程。
本实施例提供的N2切换的实现方法，在切换准备阶段，SMF网元没有向PCF网元上报UE的位置信息，PCF网元也没有下发新规则。没有新规则要安装，没有老规则要删除，UPF网元即使变化，也只会是I-UPF网元发生改变，切换取消时，只需要删除I-UPF网元即可，实现起来简单很多。相对于目前的N2切换实现过程中，在切换准备阶段，SMF网元会正常向PCF网元上报终端新位置，PCF网元会下发新规则，同时还可能指示删除原来的老规则。SMF网元会根据新规则选出新的PSA网元与I-UPF网元，并且指示这些UPF网元使用新规则，删除老规则等。一旦发生切换取消，首先需要再告知PCF网元终端回到切换前位置，请求PCF网元再下发切换前的规则，同时删除新的规则，SMF网元又要重新根据之前的位置选择出原来的UPF网元，再安装之前的规则等，本实施例提供的N2切换的实现方法，不需要通知UPF网元停止应用当前的控制策略，以及告知PCF网元用户将回到切换前的位置，让PCF网元基于切换前的位置下发原有的控制策略，再通知原来的UPF网元应用原有的控制策略步骤，减少了回退流程，降低了实现难度。
由于SMF网元在接收到T-AMF网元发送的切换消息后并未立刻向PCF网元发送UE的位置信息，因此，在N2切换的实现过程中，SMF网元下发给UPF网元的仍然为原有的控制策略，选择UPF网元时使用的也是原有的控制策略。
基于此，本申请实施例另一方面还提供了一种N2切换的实现方法，应用于SMF网元，如图3所示，N2切换的实现方法的流程至少包括以下步骤：
步骤301，接收目标接入和移动性管理功能T-AMF网元发送的切换请求，请求提供服务消息携带用户终端UE的位置信息。
本实施例中的步骤301与第一个方法实施例中的步骤101大致相同，此处就不再一一赘述了。
步骤302，在检测到位置信息未处于当前配置的UPF网元覆盖范围内的情况下，根据位置信息和所述PCF网元下发的历史控制策略重新选择UPF网元。
本实施例中，根据位置信息和PCF网元下发的历史控制策略重新选择UPF网元之后，N2切换的实现方法还包括：将PCF网元下发的历史控制策略发送给重新选择的UPF网元。
本实施例中PCF网元下发的历史控制策略是指SMF网元接收到的PCF网元上一次下发的控制策略。
由于SMF网元接收到T-AMF网元发送的切换请求后并未立刻向PCF网元发送UE的位置信息，PCF网元也就不会下发新的控制策略，使用的就是原有的控制策略。这样，若是需要取消切换，使用的控制策略为原有的，PCF网元不需要进行控制策略恢复，回退流程更加 简洁。
步骤303，在接收到T-AMF网元发送的切换完成消息后，将位置信息发送给策略控制功能PCF网元，供PCF网元根据位置信息确定下发给用户面功能UPF网元的控制策略。
本实施例中的步骤303与第一个方法实施例中的步骤102大致相同，此处就不再一一赘述了。
由于SMF网元接收到T-AMF网元发送的切换请求后并未立刻向PCF网元发送UE的位置信息，PCF网元也就不会下发新的控制策略，使用的就是原有的控制策略。而在切换完成之后，UPF网元上的控制策略为原有的控制策略，可能与UE的位置信息不贴合，需要基于UE的位置信息重新确定UPF网元上应用的控制策略。
基于此，本申请实施例另一方面还提供了一种N2切换的实现方法，应用于SMF网元，如图4所示，N2切换的实现方法的流程至少包括以下步骤：
步骤401，接收目标接入和移动性管理功能T-AMF网元发送的切换请求，请求提供服务消息携带用户终端UE的位置信息。
本实施例中的步骤401与第一个方法实施例中的步骤101大致相同，此处就不再一一赘述了。
步骤402，在接收到T-AMF网元发送的切换完成消息后，将位置信息发送给策略控制功能PCF网元，供PCF网元根据位置信息确定下发给用户面功能UPF网元的控制策略。
本实施例中的步骤402与第一个方法实施例中的步骤102大致相同，此处就不再一一赘述了。
步骤403，接收PCF网元根据位置信息下发的控制策略。
本实施例主要是对控制策略需要更新的情况进行描述，在其他实施例中，PCF网元在接受到UE的位置信息后，可能会出现仍然使用原有的控制策略的情况，也就是说，在其他实施例中，可能由于UE的位置信息对应的控制策略仍未原有的控制策略，而使得PCF网元不会下发控制策略。
步骤404，将接收到的控制策略转发给对应的UPF网元。
本实施例中，SMF需要将接收到的控制策略转发给对应的UPF网元，以便UPF网元上应用的控制策略能够与UE的位置信息相适应。
还可以理解的是，N2切换可能会被取消，即在完成切换之前受到切换取消请求。
基于此，本申请实施例另一方面还提供了一种N2切换的实现方法，应用于SMF网元，如图5所示，N2切换的实现方法的流程至少包括以下步骤：
步骤501，接收目标接入和移动性管理功能T-AMF网元发送的切换请求，请求提供服务消息携带用户终端UE的位置信息。
本实施例中的步骤501与第一个方法实施例中的步骤101大致相同，此处就不再一一赘述了。
步骤502，接收切换取消请求。
切换取消流程通常由是由S-NG-RAN发起，经其他中间设备如T-AMF网元传递到SMF网元，此处就不再一一赘述了。
根据3GPP23.502协议的规定，切换取消请求通常在切换准备阶段发起，即在确定切换完成之前，也就是说，切换取消请求在SMF网元向PCF网元发送UE的位置信息之前，从而为 了使切换回到切换前状态，需要释放目标系统为切换分配的资源，以及将修改的配置恢复为原有的配置，但是没有进行的操作，切换取消时是不需要进行恢复。因此，本实施例中，不需要执行向PCF网元请求原有的控制策略、向UPF网元重新下发原有的控制策略等步骤，简化了N2切换取消流程，降低了实现难度。
步骤503，根据切换取消请求释放为切换请求配置的资源并删除位置信息。
为了使切换回到切换前状态，需要释放目标系统为切换分配的资源，即释放为切换请求配置的资源，而用于实现N2切换的位置信息同时也需要删除。
此外，上面各种方法的步骤划分，只是为了描述清楚，实现时可以合并为一个步骤或者对某些步骤进行拆分，分解为多个步骤，只要包括相同的逻辑关系，都在本专利的保护范围内；对算法中或者流程中添加无关紧要的修改或者引入无关紧要的设计，但不改变其算法和流程的核心设计都在该专利的保护范围内。
本申请实施例另一方面还提供了一种会话管理功能网元，如图6所示，包括：
接收模块601，用于接收目标接入和移动性管理功能T-AMF网元发送的切换请求，切换请求携带用户终端UE的位置信息。
发送模块602，用于在接收到T-AMF网元发送的切换完成消息后，将位置信息发送给策略控制功能PCF网元，供PCF网元根据位置信息确定下发给用户面功能UPF网元的控制策略。
本实施例为与方法实施例相对应的装置实施例，本实施例可与方法实施例互相配合实施。方法实施例中提到的相关技术细节在本实施例中依然有效，为了减少重复，这里不再赘述。相应地，本实施例中提到的相关技术细节也可应用在方法实施例中。
本实施例中所涉及到的各模块均为逻辑模块，在实际应用中，一个逻辑单元可以是一个物理单元，也可以是一个物理单元的一部分，还可以以多个物理单元的组合实现。此外，为了突出本申请的创新部分，本实施例中并没有将与解决本申请所提出的技术问题关系不太密切的单元引入，但这并不表明本实施例中不存在其它的单元。
本申请实施例另一方面还提供了一种网络设备，如图7所示，包括：至少一个处理器701；以及，与至少一个处理器701通信连接的存储器702；其中，存储器702存储有可被至少一个处理器701执行的指令，指令被至少一个处理器701执行，以使至少一个处理器701能够执行上述任一方法实施例所描述的N2切换的实现方法。
其中，存储器702和处理器701采用总线方式连接，总线可以包括任意数量的互联的总线和桥，总线将一个或多个处理器701和存储器702的各种电路连接在一起。总线还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路连接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口在总线和收发机之间提供接口。收发机可以是一个元件，也可以是多个元件，比如多个接收器和发送器，提供用于在传输介质上与各种其他装置通信的单元。经处理器701处理的数据通过天线在无线介质上进行传输，进一步，天线还接收数据并将数据传输给处理器701。
处理器701负责管理总线和通常的处理，还可以提供各种功能，包括定时，外围接口，电压调节、电源管理以及其他控制功能。而存储器702可以被用于存储处理器701在执行操作时所使用的数据。
本申请实施例另一方面还提供了一种计算机可读存储介质，存储有计算机程序。计算机 程序被处理器执行时实现上述任一方法实施例所描述的N2切换的实现方法。
即，本领域技术人员可以理解，实现上述实施例方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序存储在一个存储介质中，包括若干指令用以使得一个设备(可以是单片机，芯片等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
本领域的普通技术人员可以理解，上述各实施例是实现本申请的具体实施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本申请的精神和范围。

Claims (10)

  1. 一种N2切换的实现方法，应用于会话管理功能SMF网元，包括：
    接收目标接入和移动性管理功能T-AMF网元发送的切换请求，所述切换请求携带用户终端UE的位置信息；
    在接收到所述T-AMF网元发送的切换完成消息后，将所述位置信息发送给策略控制功能PCF网元，供所述PCF根据所述位置信息确定下发给用户面功能UPF网元的控制策略。
  2. 根据权利要求1所述的N2切换的实现方法，其中，所述接收目标接入和移动性管理功能T-AMF网元发送的切换请求后，所述方法还包括：
    在检测到所述位置信息未处于当前配置的UPF网元覆盖范围内的情况下，根据所述位置信息和所述PCF网元下发的历史控制策略重新选择UPF网元。
  3. 根据权利要求2所述的N2切换的实现方法，其中，所述根据所述位置信息和所述PCF网元下发的历史控制策略重新选择UPF网元之后，所述方法还包括：
    将所述PCF网元下发的历史控制策略发送给重新选择的UPF网元。
  4. 根据权利要求1至3中任一项所述的N2切换的实现方法，其中，所述将所述位置信息发送给策略控制功能PCF网元之后，所述方法还包括：
    接收所述PCF网元根据所述位置信息下发的控制策略；
    将接收到的控制策略转发给对应的所述UPF网元。
  5. 根据权利要求1至3中任一项所述的N2切换的实现方法，其中，所述接收目标接入和移动性管理功能T-AMF网元发送的切换请求之后，所述将所述位置信息发送给策略控制功能PCF网元之前，所述方法还包括：
    接收切换取消请求；
    根据所述切换取消请求释放为所述切换请求配置的资源并删除所述位置信息。
  6. 根据权利要求1至3中任一项所述的N2切换的实现方法，其中，所述位置信息用于指示所述UE将要达到的区域。
  7. 根据权利要求1至3中任一项所述的N2切换的实现方法，其中，所述接收目标接入和移动性管理功能T-AMF网元发送的切换请求之后，所述将所述位置信息发送给策略控制功能PCF网元之前，所述方法还包括：
    暂存所述位置信息。
  8. 一种会话管理功能网元，包括：
    接收模块，用于接收目标接入和移动性管理功能T-AMF网元发送的切换请求，所述切换请求携带用户终端UE的位置信息；
    发送模块，用于在接收到所述T-AMF网元发送的切换完成消息后，将所述位置信息发送给策略控制功能PCF网元，供所述PCF网元根据所述位置信息确定下发给用户面功能UPF网元的控制策略。
  9. 一种网络设备，包括：
    至少一个处理器；以及，
    与所述至少一个处理器通信连接的存储器；其中，
    所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行如权利要求1至7中任意一项所述N2切换的实 现方法。
  10. 一种计算机可读存储介质，存储有计算机程序，其中，所述计算机程序被处理器执行时实现如权利要求1至7中任一项所述的N2切换的实现方法。
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