WO2018214638A1 - 用户面功能实体重选的策略控制方法、设备及存储介质 - Google Patents

用户面功能实体重选的策略控制方法、设备及存储介质 Download PDF

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Publication number
WO2018214638A1
WO2018214638A1 PCT/CN2018/080732 CN2018080732W WO2018214638A1 WO 2018214638 A1 WO2018214638 A1 WO 2018214638A1 CN 2018080732 W CN2018080732 W CN 2018080732W WO 2018214638 A1 WO2018214638 A1 WO 2018214638A1
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Prior art keywords
upf
address
target application
smf
pdu session
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PCT/CN2018/080732
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English (en)
French (fr)
Inventor
周晓云
朱进国
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中兴通讯股份有限公司
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Publication of WO2018214638A1 publication Critical patent/WO2018214638A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • 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
    • H04W36/24—Reselection being triggered by specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality

Definitions

  • the present invention relates to a mobile communication technology, and in particular, to a user plane function entity (UPF) reselection policy control method, device, and storage medium.
  • UPF user plane function entity
  • FIG. 1 is a schematic structural diagram of a conventional 5G network based on a single protocol data unit (PDU) session.
  • the 5G network includes the following functions: connection management function: mainly responsible for the air interface resource scheduling of the terminal accessing the network and the connection management of the air interface; the authentication service function: mainly responsible for accessing the user equipment (User Equipment, UE) Authentication and authorization; Unified Data Manager (UDM) function: mainly responsible for saving user's subscription data; Access and Mobility Management Function (AMF): mainly responsible for access authentication, authorization, and Mobility management; Session Management Function (SMF), mainly responsible for session management, Internet Protocol (IP) address allocation; UPF, mainly responsible for routing, forwarding, and policy enforcement of packet data.
  • Policy Control Function PCF
  • Application Function AF
  • PCF Policy Control Function
  • AF Application Function
  • Mode 1 No matter how the access network used by the UE changes, the UPF remains unchanged
  • Mode 2 When the UE does not leave the service area of the UPF, the UPF remains unchanged; when the UE leaves the service area of the UPF, a different UPF suitable for the current access point attachment point of the UE will be used to serve the UE
  • Mode 3 The UE is allowed to create a new PDU session to the same data network before the end of the first PDU session, and the network selects a second UPF suitable for the UE. At this time, the UE may release the first UPF after the application is migrated from the first UPF to the second UPF; or the UE releases the first UPF after waiting for the application bound to the first UPF to end.
  • FIG. 2 is a schematic structural diagram of a 5G network based on a multi-homed PDU session in the related art.
  • the network introduces a branching point in the user plane link of the UE and allocates a new UPF, that is, a second user plane function entity (second UPF).
  • second UPF second user plane function entity
  • the network will also assign another IP address to the UE.
  • the bifurcation point forwards the data of the UE using the new IP address to the second user plane function entity (second UPF), and the data using the old IP address is still forwarded to the first user plane function entity (first UPF). .
  • the bifurcation point aggregates data from the first user plane function entity (first UPF) and the second user plane function entity (second UPF) and forwards the data to the base station.
  • first UPF first user plane function entity
  • second UPF second user plane function entity
  • the bifurcation point may be integrated with the second user plane functional entity 2 (second UPF).
  • FIG. 3 is a schematic diagram showing an implementation process of a policy control method for UPF reselection in the related art. As shown in FIG. 3, the policy control method of the UPF reselection may include the following steps:
  • Step 301 A first PDU session is established between the UE and the first UPF.
  • Step 302 When the SMF satisfies a preset trigger condition, the SMF performs a Multi-Homed decision.
  • Step 303 The SMF sends a NAS message notification to the UE.
  • the SMF notifies the UE that the first PDU session will be released after a period of time (Time1), and the SMF informs the UE to request to establish a second PDU session to the same external data network DN (Data Network).
  • DN Data Network
  • Step 304 The UE sends a message to the SMF to establish a second PDU session with the second UPF.
  • Step 305 Release a first PDU session between the UE and the first UPF.
  • the SMF determines whether to perform UPF reselection, although when the SMF satisfies the preset trigger condition, the third party application may be heavily weighted from the first UPF according to the request of the third party application. Selecting to the second UPF, but since the SMF can only perform UPF reselection for one of the target applications, there is no way for the SMF to reselect the target applications from the first UPF to the second UPF for other target applications that the UE is accessing. This will have an impact on the experience of other target applications that the UE is accessing.
  • the embodiment of the present invention is to provide a policy control method, device, and storage medium for UPF reselection, which may notify the UE of other target applications that are being accessed by the UPF after the target application triggers the UPF reselection.
  • the reselected event so that other target applications perform application layer reselection within the validity period of the first IP address, and does not affect the experience of other target applications that the UE is accessing.
  • An embodiment of the present invention provides a policy control method for UPF reselection, where the method includes:
  • the event notification that the anchor point reselection occurs in the first PDU session and the validity period of the first IP address of the UE corresponding to the first UPF and the second UE corresponding to the second UPF are obtained in the SMF.
  • the method further includes:
  • the first IP address is obtained from the SMF during the establishment of the first PDU session.
  • the event notification that the anchor point reselection occurs in the first PDU session and the validity period of the first IP address of the UE corresponding to the first UPF and the second IP address of the UE corresponding to the second UPF are obtained in the SMF.
  • the method further includes:
  • the policy rules corresponding to the respective target applications are provided to the SMF.
  • the method further includes:
  • a second policy rule corresponding to each target application is provided to the SMF.
  • the method further includes:
  • the addresses of the target application servers corresponding to the respective target applications are provided to the SMF.
  • the embodiment of the invention further provides a policy control method for UPF reselection, the method comprising:
  • the event notification of the anchor reselection and the validity period of the first IP address of the UE corresponding to the first UPF and the second IP address of the UE corresponding to the second UPF are notified to the PCF.
  • the method before performing the anchor reselection on the first PDU session, the method further includes:
  • the trigger condition includes at least one of the following:
  • the method further includes:
  • the method further includes:
  • the method before performing the anchor reselection on the first PDU session, the method further includes:
  • the first packet detection rule corresponding to each target application is provided to the second UPF.
  • the method further includes:
  • Corresponding packet detection rules for each target application are provided to the second UPF.
  • the method before performing the anchor reselection on the first PDU session, the method further includes:
  • the addresses of the source application servers corresponding to the respective target applications are provided to the UE.
  • the method further includes:
  • the addresses of the target application servers corresponding to the respective target applications are provided to the UE.
  • An embodiment of the present invention further provides a PCF, where the PCF includes: an acquiring unit and a sending unit;
  • the acquiring unit is configured to acquire, from the SMF, an event notification that the first PDU session has an anchor reselection, and a validity period of the first IP address of the UE corresponding to the first UPF and a second IP address of the UE corresponding to the second UPF;
  • the acquiring unit is further configured to acquire the first IP address from the SMF during the establishment of the first PDU session.
  • the PCF further includes: a policy rule setting unit configured to receive first service information corresponding to each target application provided by each AF; and formulate, according to the first service information corresponding to each target application, corresponding to each target application First policy rule;
  • the sending unit is further configured to provide a policy rule corresponding to each target application to the SMF.
  • the policy rule setting unit is further configured to receive second service information corresponding to each target application provided by each AF, and formulate a second policy corresponding to each target application according to the second service information corresponding to each target application. rule;
  • the sending unit is further configured to provide a second policy rule corresponding to each target application to the SMF.
  • the acquiring unit is further configured to receive an address of a target application server corresponding to each target application provided by each AF;
  • the sending unit is further configured to provide an address of the target application server corresponding to each target application to the SMF.
  • An embodiment of the present invention further provides an SMF, where the SMF includes: an anchor reselection unit and a notification unit;
  • the anchor reselection unit is configured to perform anchor reselection on the first PDU session when a preset trigger condition is met;
  • the notification unit is configured to notify the PCF of the event notification that the anchor reselection occurs, the validity period of the first IP address of the UE corresponding to the first UPF, and the second IP address of the UE corresponding to the second UPF.
  • the SMF further includes: an address allocation unit, configured to: when the first PDU session is established, select the first UPF for the first PDU session, and allocate the first IP address;
  • the notification unit is further configured to notify the PCF of the first IP address.
  • the trigger condition includes at least one of the following:
  • the address allocation unit is further configured to change the first UPF session to a Multi-Homing PDU session; select the second UPF for the Multi-Homing PDU session, and allocate the first Two IP addresses.
  • the notifying unit is further configured to notify the UE that the first PDU session is to be released after the validity period, so that the UE requests to establish a second PDU session;
  • the first PDU session is the same as the external data network DN corresponding to the second PDU session;
  • the address allocation unit is further configured to receive the setup request message of the second PDU session sent by the UE, select the second UPF for the second PDU session, and allocate the second IP address.
  • the SMF further includes: a detection rule determining unit configured to receive a first policy rule corresponding to each target application defined by the PCF; and formulate, according to the first policy rule corresponding to each target application, each target application corresponding First packet detection rule;
  • the notification unit is further configured to provide a first packet detection rule corresponding to each target application to the second UPF.
  • the detection rule determining unit is further configured to receive a second policy rule corresponding to each target application defined by the PCF, and formulate a second corresponding to each target application according to the second policy rule corresponding to each target application.
  • Group detection rule
  • the notification unit is further configured to provide a corresponding group detection rule of each target application to the second UPF.
  • the anchor reselection unit is further configured to receive an address of a source application server corresponding to each target application provided by the PCF;
  • the notification unit is further configured to provide an address of the source application server corresponding to each target application to the UE.
  • the anchor reselection unit is further configured to receive an address of a target application server corresponding to each target application provided by the PCF;
  • the notification unit is further configured to provide an address of the target application server corresponding to each target application to the UE.
  • An embodiment of the present invention further provides a PCF, including: a processor and a memory storing the processor executable instructions, when the instructions are executed by the processor, executing:
  • An embodiment of the present invention further provides an SMF, including: a processor and a memory storing the processor executable instructions, when the instructions are executed by the processor, executing:
  • the event notification of the anchor reselection and the validity period of the first IP address of the UE corresponding to the first UPF and the second IP address of the UE corresponding to the second UPF are notified to the PCF.
  • the embodiment of the invention further provides a storage medium, where the computer-executable instructions are stored in the storage medium, and the computer executable instructions are used to execute:
  • the embodiment of the present invention further provides another storage medium, where the computer-executable instructions are stored in the storage medium, and the computer executable instructions are used to execute:
  • the event notification of the anchor reselection and the validity period of the first IP address of the UE corresponding to the first UPF and the second IP address of the UE corresponding to the second UPF are notified to the PCF.
  • the PCF may first obtain an event notification of the anchor reselection of the first PDU session from the SMF, and the validity period of the first IP address and the second UPF of the UE corresponding to the first UPF. Corresponding UE's second IP address; then the PCF may send the validity period of the first IP address and the second IP address to the AF corresponding to each target application.
  • the PCF may notify the AF corresponding to each target application by the validity period of the IP address corresponding to the first UPF and the IP address of the second UPF, so that each target application can be in the first
  • An application layer re-selection is performed before the expiration of an IP address, that is, the second IP address is used for service access, and each target application may select an application server that is closer to the second UPF to continue to provide services.
  • the SMF can only perform UPF reselection for one of the target applications.
  • the policy control method, the PCF, and the SMF of the UPF reselection proposed by the embodiment of the present invention may notify the UE that other target applications being accessed by the UPF reselection after the UPF reselection is triggered by one target application.
  • FIG. 1 is a schematic structural diagram of a conventional 5G network based on a single PDU session
  • FIG. 2 is a schematic structural diagram of a structure of a conventional 5G network based on a multi-homed PDU session
  • FIG. 3 is a schematic flowchart of an implementation process of a policy control method for UPF reselection in related art
  • FIG. 4 is a schematic flowchart of a first implementation process of a policy control method for UPF reselection according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a second implementation process of a policy control method for UPF reselection according to an embodiment of the present invention
  • FIG. 6 is a schematic flowchart of a third implementation process of a policy control method for UPF reselection according to an embodiment of the present disclosure
  • FIG. 7 is a schematic flowchart of a fourth implementation process of a policy control method for UPF reselection according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a first component structure of a PCF according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram showing a second component structure of a PCF according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram showing a first component structure of an SMF according to an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of a second component structure of an SMF according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of hardware components of a device according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic flowchart of a first implementation process of a policy control method for UPF reselection according to an embodiment of the present invention.
  • the policy control method of the UPF reselection may include the following steps:
  • Step 401 Acquire an event notification that an anchor reselection occurs in the first PDU session from the SMF, and a validity period of the first IP address of the UE corresponding to the first UPF and a second IP address of the UE corresponding to the second UPF.
  • the PCF obtains, from the SMF, an event notification that the first PDU session has an anchor reselection, the validity period of the first IP address of the UE corresponding to the first UPF, and the second IP of the UE corresponding to the second UPF. address.
  • the PCF acquires an event notification that the first PDU session is anchored from the SMF and the validity period of the first IP address of the UE corresponding to the first UPF corresponds to the second UPF.
  • the PCF may acquire the first IP address from the SMF during the establishment of the first PDU session.
  • the PCF notifies the event that the anchor point reselection occurs from the PCF when acquiring the first PDU session from the SMF, and the validity period and the second period of the first IP address of the UE corresponding to the first UPF.
  • the PCF may also receive the first service information corresponding to each target application provided by each AF; and formulate the first policy rule corresponding to each target application according to the first service information corresponding to each target application; The policy rules corresponding to each target application are provided to the SMF.
  • Step 402 Send the validity period of the first IP address and the second IP address to the AF corresponding to each target application.
  • the PCF sends the validity period of the first IP address and the second IP address to the AF corresponding to each target application.
  • the PCF may further receive the corresponding target application provided by each AF.
  • the second service information is determined according to the second service information corresponding to each target application, and the second policy rule corresponding to each target application is provided to the SMF.
  • the PCF may further receive the corresponding target application provided by each AF.
  • the address of the target application server; the address of the target application server corresponding to each target application is provided to the SMF.
  • the PCF may first notify the event that the anchor reselection occurs from the first PDU session, and the validity period of the first IP address of the UE corresponding to the first UPF and the UE corresponding to the second UPF. The second IP address; then the PCF can send the validity period of the first IP address and the second IP address to the AF corresponding to each target application.
  • the PCF may notify the AF corresponding to the first PDU session by the validity period of the IP address corresponding to the first UPF and the IP address of the second UPF, so that each target application can be
  • the application layer re-selection is performed before the expiration of the first IP address, that is, the second IP address is used for service access, and each target application may select an application server that is closer to the second UPF to continue to provide services.
  • the SMF can only perform UPF reselection for one of the target applications.
  • the policy control method of the UPF reselection proposed by the embodiment of the present invention may notify the other target to apply the UPF reselection event after the target application triggers the UPF reselection, so that other target applications are in the first application.
  • the re-selection of the application layer during the validity period of an IP address does not affect the experience of the other target applications that the UE is accessing; and the technical solution of the embodiment of the present invention is simple, convenient, popularized, and widely used.
  • FIG. 5 is a schematic diagram of a second implementation flow of a policy control method for UPF reselection according to an embodiment of the present invention.
  • the policy control method for UPF reselection may include the following steps:
  • Step 501 Perform anchor reselection on the first PDU session when the preset trigger condition is met.
  • the SMF performs anchor reselection on the first PDU session when a pre-set trigger condition is met.
  • the SMF may select the first UPF for the first PDU session during the establishment of the first PDU session. , assigning a first IP address; notifying the PCF of the first IP address.
  • the triggering condition includes at least one of the following: the SMF receives the traffic steering request sent by any one of the target applications; or the network load of the first UPF exceeds a preset threshold.
  • the SMF receives the report of the user plane detection information sent by the first UPF.
  • the SMF may also change the first UPF session to a multihomed Multi-Homing PDU session; a Multi-Homing PDU session. Select the second UPF and assign a second IP address.
  • the SMF may further notify the UE that the first PDU session will be released after the validity period, so that the UE requests to establish a first a second PDU session; wherein the first PDU session is the same as the external data network DN corresponding to the second PDU session; the SMF receives the setup request message of the second PDU session sent by the UE, selects the second UPF for the second PDU session, and allocates the first Two IP addresses.
  • the SMF may further receive the first policy rule corresponding to each target application formulated by the PCF;
  • the first policy rule defines a first packet detection rule corresponding to each target application; and the first packet detection rule corresponding to each target application is provided to the second UPF.
  • the SMF may further receive an address of the source application server corresponding to each target application provided by the PCF; The address of the source application server is provided to the UE.
  • Step 502 Notify the PCF of the event notification of the anchor reselection and the validity period of the first IP address of the UE corresponding to the first UPF and the second IP address of the UE corresponding to the second UPF.
  • the SMF notifies the PCF of the event notification of the anchor reselection and the validity period of the first IP address of the UE corresponding to the first UPF and the second IP address of the UE corresponding to the second UPF.
  • the SMF notifies the event that the anchor reselection will occur, and the validity period of the first IP address of the UE corresponding to the first UPF and the second IP address of the UE corresponding to the second UPF.
  • the SMF may also receive a second policy rule corresponding to each target application that is defined by the PCF; and formulate a second group detection rule corresponding to each target application according to the second policy rule corresponding to each target application;
  • the packet detection rule is provided to the second UPF.
  • the SMF notifies the event that the anchor reselection will occur, and the validity period of the first IP address of the UE corresponding to the first UPF and the second IP address of the UE corresponding to the second UPF.
  • the SMF may also receive the address of the target application server corresponding to each target application provided by the PCF; and provide the address of the target application server corresponding to each target application to the UE.
  • the UPF reselection policy control method is provided by the embodiment of the present invention.
  • the SMF may perform anchor reselection on the first PDU session; then the SMF may notify the event that the anchor reselection occurs and the first The validity period of the first IP address of the UE corresponding to the UPF and the second IP address of the UE corresponding to the second UPF are notified to the PCF. That is, in the technical solution of the embodiment of the present invention, the SMF may notify the event that the anchor reselection occurs, the validity period of the first IP address of the UE corresponding to the first UPF, and the second IP of the UE corresponding to the second UPF.
  • the address is notified to the PCF, and then the PCF can notify the AF corresponding to each target application by the validity period of the IP address corresponding to the first UPF and the IP address of the second UPF, so that each target application can be executed before the validity period of the first IP address.
  • the application layer is reselected, that is, the second IP address is used for service access, and each target application can select an application server that is closer to the second UPF to continue to provide services.
  • the SMF can only perform UPF reselection for one of the target applications.
  • the policy control method of the UPF reselection proposed by the embodiment of the present invention may notify the UE that the other target being accessed by the UPF reselection event after the target application triggers the UPF reselection, so that the other The target application performs the re-selection of the application layer during the validity period of the first IP address, and does not affect the experience of the other target applications that the UE is accessing; and the technical solution of the embodiment of the present invention is simple, convenient, popularized, and used. A wider range.
  • FIG. 6 is a schematic flowchart of a third implementation process of a policy control method for UPF reselection according to an embodiment of the present invention.
  • the policy control method for UPF reselection may include the following steps:
  • Step 601 The UE initiates an attach procedure to the AMF through the base station, and completes the network registration of the UE in the AMF.
  • Step 602 The UE initiates a PDU session establishment request message of the first PDU session to the AMF.
  • the PDU session establishment request message may carry the first PDU session identifier, the request type, the N1 session management information (SM Information), and the data network. ID (Data Name, DN Name).
  • Step 603 The AMF sends a session management request message to the selected SMF.
  • the session management request message may carry a user identifier, a DN Name, a first DPU session identifier, user location information, an SSC Mode, and N1 session management information.
  • N1 SM Information may carry a user identifier, a DN Name, a first DPU session identifier, user location information, an SSC Mode, and N1 session management information.
  • Step 604 The SMF selects an UPF as the anchor UPF (represented as the first UPF) for the first PDU session, and allocates an IP address corresponding to the anchor UPF to the UE (here, IPv6 prefix1, denoted as the first IP address).
  • the SMF sends a first policy request message corresponding to the first PDU session to the PCF.
  • the first policy request message may carry the user identifier, DN Name, SSC Mode, and IPv6 prefix1.
  • the SMF may also interact with the unified data management UDM to obtain the subscription information of the user and perform verification on the UE.
  • the SMF can also report the capability indication of the UE supporting Multi-Homed to the PCF.
  • Step 605 The PCF returns a first policy confirmation message to the SMF, where the first policy confirmation message may carry a default policy.
  • the default policy may include: an Aggregate Maximum Bit Rat (AMBR), a QoS parameter, and an event trigger event trigger.
  • AMBR Aggregate Maximum Bit Rat
  • QoS Quality of Service
  • event trigger event trigger an event trigger event trigger.
  • Step 606 The SMF sends an N4 session establishment request message to the first UPF.
  • the first UPF returns an N4 session establishment confirmation message to the SMF.
  • the N4 session establishment request message may carry the packet detection rule.
  • the first UPF may install/activate the packet detection rule carried in the N4 session establishment request message, and return N4 to the SMF. Session establishment confirmation message. If the first UPF allocates the CN tunnel information, the first UPF may also carry the CN tunnel information in the N4 session establishment confirmation message returned by the SMF.
  • Step 607 The SMF sends a session management response message to the AMF.
  • the session management response message may carry N2 session information (N2 SM Information) and N1 session information (N1 SM Information).
  • Step 608 The AMF sends an N2 PDU session request message to the base station, where the N2 PDU session request message may carry N2 session management information and NAS information.
  • Step 609 The base station sends an access network AN (Access Network) specific signaling to the UE; and provides the UE with the information received from the SMF.
  • AN Access Network
  • Step 610 The base station sends an N2 PDU session response message to the AMF.
  • the N2 PDU session response message may carry the first PDU session identifier and the N2 session management information.
  • Step 611 The AMF sends an N2 session management request message to the SMF.
  • the N2 session management request message may carry the N2 session management information.
  • Step 612 The AMF sends an N4 session establishment request message to the first UPF.
  • the first UPF returns an N4 session establishment confirmation message to the AMF.
  • Step 613 The SMF returns an N2 session management response message to the AMF.
  • Step 614 The SMF sends an IPv6 Route Advertisement (RA) message to the UE by using the first UPF.
  • the IPv6 route advertisement message may carry the first IP address.
  • the UE performs service access through the established first PDU session, and can access multiple target applications at the same time.
  • the AF corresponding to each target application can directly interact with the PCF.
  • the NEF can also interact with the PCF to provide relevant service information to the PCF for policy decision of the PCF.
  • the first service information corresponding to each target application provided by the AF to the PCF may carry information such as the first IP address, the first media description component, and the bandwidth requested for the first time; the second service corresponding to each target application provided by the AF to the PCF
  • the information may carry information such as the second IP address, the second media description component, and the bandwidth of the second request.
  • Step 615 When the SMF satisfies a preset trigger condition, the SMF performs a Multi-Homed decision on the first PDU session.
  • the triggering condition may include: the SMF receives a traffic steering request sent by any one of the target applications; or the network load of the first UPF exceeds a preset threshold; or, the SMF receives The reporting of the user plane detection information sent by the first UPF. That is, any third-party application may find that the location of the UE and the location of the first UPF are not the best path to access the third-party application, and the third-party application may send a traffic steering request to the SMF, and the SMF receives the third party.
  • the SMF may decide to reselect the UPF; or, when the network load of the first UPF exceeds a preset threshold, the SMF may decide to reselect the UPF; or, the SMF receives the reporting of the user plane detection information.
  • the SMF can decide to re-select the UPF.
  • Step 616 The SMF selects a new UPF as the new anchor UPF (represented as the second UPF), and allocates a new IP address corresponding to the UPF of the new anchor point (here, IPv6 perfix2, denoted as the second UPF). .
  • the SMF sends a second policy request message corresponding to the first PDU session to the PCF, where the second policy request message can carry at least the validity period of the IPv6 prefix1, the IPv6 prefix2, and the IPv6 prefix1.
  • Step 617 The PCF performs policy authorization.
  • the PCF decides to install or activate the policy rules for the second UPF.
  • the PCF returns a second policy confirmation message to the SMF.
  • Step 618 The SMF selects an UPF (represented as a third UPF) as a branching point (BP); the SMF sends an N4 session establishment request message to the second UPF; and the second UPF returns an N4 session establishment confirmation message to the SMF;
  • the packet detection rule may be carried in the N4 session establishment request message.
  • the second UPF may install/activate the packet detection rule carried in the N4 session establishment request message, and return N4 to the SMF. Session establishment confirmation message. If the second UPF allocates the CN tunnel information, the second UPF may also carry the CN tunnel information in the N4 session establishment confirmation message returned by the SMF.
  • Step 619 The SMF sends an N4 session establishment message to the BP.
  • the BP returns an N4 session confirmation message to the SMF.
  • the N4 session setup message may carry the tunnel information of the first UPF, the tunnel information of the second UPF, and the tunnel information of the RAN.
  • the SMF may further send a packet detection rule to the BP, and forward the uplink data that matches the source address and the IPv6 prefix1 to the first UPF, and forward the uplink data that matches the source address and the IPv6 prefix2 to the first Two UPFs; simultaneously send downlink data from the first UPF or the second UPF to the RAN. If the CN tunnel information is allocated by the first UPF, the N4 session confirmation message returned by the BP to the SMF may carry the tunnel information of the BP.
  • Step 620 If the CN tunnel information is allocated by the second UPF, the SMF sends an N4 session modification request message to the second UPF; the second UPF returns an N4 session modification confirmation message to the SMF; wherein the N4 session modification request message carries the BP Tunnel information.
  • Step 621 The SMF sends an N4 session modification request message to the first UPF.
  • the first UPF returns an N4 session modification confirmation message to the SMF.
  • the N4 session modification request message carries the tunnel information of the BP.
  • Step 622 The SMF sends a session modification request message to the base station by using the AMF.
  • the base station returns a session modification response message to the SMF through the AMF.
  • the session modification request message may carry the tunnel information of the BP.
  • Step 623 The SMF sends an IPv6 route advertisement message (IPv6 RA message) to the UE by using the first UPF.
  • IPv6 RA message may carry the first IP address and the validity period.
  • Step 624 The SMF sends an IPv6 RA message to the UE by using the second UPF.
  • the IPv6 RA message may carry the second IP address.
  • Step 625 The PCF makes a policy decision.
  • the PCF determines each target application that the UE is accessing and needs to perform service flow migration; in addition, the PCF needs to consider whether each target application supports application layer reselection.
  • These target applications are applications in which the AF and the PCF interact to provide service information and request QoS guarantee for the service after the first PDU session is established.
  • Step 626 The PCF sends an UPF reselection request message to the AF corresponding to the target application.
  • the UPF reselection message may carry at least the validity period of the first IP address and the second IP address.
  • the UPF reselection message may further carry location information of the second UPF.
  • Step 627 During the validity period of the first IP address, each target application interacts with the UE to perform reselection of the application layer, and the UE uses the IP address generated by the new IPv6 Prefix 2 (ie, the second IP address) to access, and each target The application may choose to access the target application server of a second UPF that is closer to continue to provide access, then the UE needs to interact with each target application server.
  • the new IPv6 Prefix 2 ie, the second IP address
  • Step 628 The AF corresponding to each target application returns an UPF reselection confirmation message to the PCF.
  • the UPF reselection confirmation message may carry the second service information after the application layer reselection.
  • the address of each target application server may also be carried in the UPF reselection confirmation message.
  • Step 629 The PCF updates the policy decision according to the confirmation message returned by the AF, and the PCF executes the policy according to the second service information of each target application provided by the AF.
  • the PCF interacts with the SMF to provide a policy rule of the target application that needs to be migrated. If the AF provides the address of the target application server of the target application, the address of the target application server may also be carried in the confirmation message.
  • Step 630 The SMF sends an N4 session establishment request message to the second UPF, where the second UPF provides a policy rule corresponding to each target application; and the second UPF returns an N4 session establishment confirmation message to the SMF.
  • Step 631 The SMF sends an IPv6 RA message to the UE by using the second UPF.
  • the IPv6 RA message may carry a second IP address (ie, IPv6 Prefixe2) and routing option information.
  • the routing option information may carry the target application server. the address of.
  • an application requiring notification is determined for each PCF, and steps 626-631 are performed.
  • the PCF may first notify the event that the anchor point reselection occurs in the first PDU session, and the validity period of the first IP address of the UE corresponding to the first UPF corresponds to the second UPF.
  • the second IP address of the UE then the PCF may send the validity period of the first IP address and the second IP address to the AF corresponding to each target application.
  • the PCF may notify the AF corresponding to the IP address of the first UPF and the IP address of the second UPF to the AF corresponding to the first PDU session, so that each target application can be
  • the application layer re-selection is performed before the expiration of the first IP address, that is, the second IP address is used for service access, and each target application may select an application server that is closer to the second UPF to continue to provide services.
  • the SMF can only perform UPF reselection for one of the target applications.
  • the policy control method of the UPF reselection proposed by the embodiment of the present invention may notify the UE that the other target being accessed by the UPF reselection event after the target application triggers the UPF reselection, so that the other The target application performs the re-selection of the application layer during the validity period of the first IP address, and does not affect the experience of the other target applications that the UE is accessing; and the technical solution of the embodiment of the present invention is simple, convenient, popularized, and used. A wider range.
  • FIG. 7 is a schematic flowchart of a fourth implementation process of a policy control method for UPF reselection according to an embodiment of the present invention.
  • the policy control method of the UPF reselection may include the following steps:
  • Step 701 The UE initiates an attach procedure to the AMF through the base station, and completes the network registration of the UE in the AMF.
  • Step 702 The UE initiates a PDU session establishment request message of the first PDU session to the AMF, where the PDU session establishment request message may carry the first PDU session identifier, the request type, the N1 session management information (SM Information), and the data network. ID (Data Name, DN Name).
  • Step 703 The AMF sends a session management request message to the selected SMF.
  • the session management request message may carry a user identifier, a DN name, a first PDU session identifier, user location information, an SSC Mode, and N1 session management information.
  • N1 SM Information may carry a user identifier, a DN name, a first PDU session identifier, user location information, an SSC Mode, and N1 session management information.
  • Step 704 The SMF selects an UPF as the anchor UPF (represented as the first UPF) for the first PDU session, and allocates an IP address corresponding to the anchor UPF to the UE (here, IPv6 prefix1 or IPv4 address1 is indicated as the first IP address).
  • the SMF sends a first policy request message corresponding to the first PDU session to the PCF.
  • the first policy request message may carry the user identifier, the DN name, the SSC Mode, and the first IP address.
  • the SMF may also interact with the unified data management UDM to obtain the subscription information of the user and perform verification on the UE.
  • Step 705 The PCF returns a first policy confirmation message to the SMF, where the first policy confirmation message may carry a default policy.
  • the default policy may include: an Aggregate Maximum Bit Rat (AMBR), a QoS parameter, and an event trigger event trigger.
  • AMBR Aggregate Maximum Bit Rat
  • QoS Quality of Service
  • event trigger event trigger an event trigger event trigger.
  • Step 706 The SMF sends an N4 session establishment request message to the first UPF.
  • the first UPF returns an N4 session establishment confirmation message to the SMF.
  • the N4 session establishment request message may carry the packet detection rule.
  • Step 707 The SMF sends a session management response message to the AMF.
  • the session management response message may carry N2 session information (N2 SM Information) and N1 session information (N1 SM Information).
  • Step 708 The AMF sends an N2 PDU session request message to the base station, where the N2 PDU session request message may carry N2 session management information and NAS information.
  • Step 709 The base station sends AN-specific signaling to the UE; and provides the UE with the information received from the SMF.
  • Step 710 The base station sends an N2 PDU session response message to the AMF.
  • the N2 PDU session response message may carry the first PDU session identifier and N2 SM Information.
  • Step 711 The AMF sends an N2 session management request message to the SMF.
  • the N2 session management request message may carry N2 session information (N2 SM Information).
  • Step 712 The AMF sends an N4 session establishment request message to the first UPF.
  • the first UPF returns an N4 session establishment confirmation message to the AMF.
  • Step 713 The SMF returns an N2 session management response message to the AMF.
  • Step 714 if the first IP address is not allocated in step 707, the SMF sends an address configuration message to the UE by using the first UPF to allocate the first IP address. For example, an IPv6 Router Advertisement (RA) message.
  • RA IPv6 Router Advertisement
  • the UE performs service access through the established first PDU session, and can access multiple target applications at the same time.
  • the AF corresponding to each target application can directly interact with the PCF.
  • the NEF can also interact with the PCF to provide relevant service information to the PCF for policy decision of the PCF.
  • the first service information corresponding to each target application provided by the AF to the PCF may carry information such as the first IP address, the first media description component, and the bandwidth requested for the first time; the second service corresponding to each target application provided by the AF to the PCF
  • the information may carry information such as the second IP address, the second media description component, and the bandwidth of the second request.
  • Step 715 When the SMF satisfies the preset trigger condition, the anchor point UPF reselection is performed through multiple PDU session establishment.
  • the triggering condition may include: the SMF receives a traffic steering request sent by any one of the target applications; or the network load of the first UPF exceeds a preset threshold; or, the SMF receives The reporting of the user plane detection information sent by the first UPF. That is, any third-party application may find that the location of the UE and the location of the first UPF are not the best path to access the third-party application, and the third-party application may send a traffic steering request to the SMF, and the SMF receives the third party.
  • the SMF may decide to reselect the UPF; or, when the network load of the first UPF exceeds a preset threshold, the SMF may decide to reselect the UPF; or, the SMF receives the reporting of the user plane detection information.
  • the SMF can decide to re-select the UPF.
  • Step 716 The SMF sends a NAS notification message to the UE.
  • the NAS notification message may carry a validity period of the first PDU session identifier and the first IP address (ie, a time when the first PDU session is to be held).
  • the SMF notifies the UE that the first PDU session will be released after a period of time, and notifies the UE to request to establish a second PDU session to the same DN.
  • Step 717 The UE sends a PDU session establishment request message of the second PDU session to the AMF, where the PDU session establishment request message may carry the first PDU session identifier, the second PDU session identifier, the request type, and the N1 session management information.
  • SM Information and Data Network Name (DN Name).
  • Step 718 The AMF selects the same SMF according to the first PDU session identifier.
  • the AMF sends a session management request message to the selected SMF.
  • the session management request message may carry the user identifier; the DN Name, the first PDU session identifier, The second PDU session identifier, user location information, SSC Mode, and N1 SM Management information.
  • Step 719 The SMF selects the second UPF as the new anchor UPF for the second PDU session, and allocates the second IP address corresponding to the second UPF to the UE (which may be IPv4 address 2 or IPv6 prefix 2).
  • the SMF sends a second policy request message corresponding to the second PDU session to the PCF.
  • the second policy request message may carry the user identifier, the DN name, the SSC Mode, and the second IP address.
  • the SMF may also interact with the unified data management UDM to obtain the subscription information of the user and perform verification on the UE.
  • Step 720 The PCF returns a second policy confirmation message to the SMF, where the second policy confirmation message may carry a default policy.
  • Step 721 The SMF sends an N4 session establishment request message to the second UPF.
  • the second UPF returns an N4 session establishment confirmation message to the SMF.
  • the N4 session establishment request message may carry the packet detection rule.
  • Step 722 The SMF sends a session management response message to the AMF.
  • the session management response message may carry N2 session information (N2 SM Information) and N1 session information (N1 SM Information).
  • Step 723 The AMF sends an N2 PDU session request message to the base station, where the N2 PDU session request message may carry the N2 session management information and the NAS information.
  • Step 724 The base station sends AN-specific signaling to the UE; and provides the UE with the information received from the SMF.
  • Step 725 The base station sends an N2 PDU session response message to the AMF.
  • the N2 PDU session response message may carry the PDU session identifier and the N2 SM information.
  • Step 726 The AMF sends an N2 session management request message to the SMF.
  • the N2 session management request message may carry N2 session information (N2 SM Information).
  • Step 727 The AMF sends an N4 session modification request message to the first UPF.
  • the first UPF returns an N4 session modification confirmation message to the AMF.
  • Step 728 The SMF returns an N2 session management response message to the AMF.
  • Step 729 the SMF sends an address configuration message to the UE to allocate a second IP address by using the second UPF.
  • an IPv6 Router Advertisement (RA) message For example, an IPv6 Router Advertisement (RA) message.
  • Step 730 The PCF makes a policy decision.
  • the PCF determines each target application that the UE is accessing and needs to perform service flow migration; in addition, the PCF needs to consider whether each target application supports application layer reselection.
  • These applications are applications in which the AF and the PCF interact to provide service information and request QoS guarantee for the service after the first PDU session is established.
  • Step 731 The PCF sends an UPF reselection request message to the AF corresponding to the target application.
  • the UPF reselection message may carry at least the validity period of the first IP address and the second IP address.
  • the location information of the second UPF may also be carried in the UPF reselection message.
  • Step 732 During the validity period of the first IP address, each target application interacts with the UE to perform reselection of the application layer, and the UE uses the new second IP address to access, and each target application may select a second UPF.
  • the target application server continues to provide access, then the UE needs to interact with each target application server.
  • Step 733 The AF corresponding to each target application returns an UPF reselection confirmation message to the PCF.
  • the UPF reselection confirmation message may carry the second service information after the application layer reselection.
  • the UPF reselection confirmation message may further carry an address of the target application server.
  • Step 734 The PCF updates the policy decision according to the confirmation information returned by the AF, and the PCF formulates a policy according to the second service information of each target application provided by the AF.
  • the PCF interacts with the SMF to provide a policy rule of the target application that needs to be migrated. If the AF provides the address of the target application server of the target application, the address of the target application server may also be carried in the confirmation information.
  • Step 735 The SMF sends an N4 session modification request message to the second UPF.
  • the second UPF returns an N4 session modification confirmation message to the SMF.
  • Step 736 the SMF sends an address configuration message, such as an IPv6 RA message, to the UE by using the second UPF, where the IPv6 RA message may carry the IPv6 prefix 2 and the routing option information, where the routing information option information is included. Carry the address that can be used by the target application server.
  • an address configuration message such as an IPv6 RA message
  • an application requiring notification is determined for each PCF, and steps 731-736 are performed.
  • the PCF may first notify the event that the anchor point reselection occurs in the first PDU session, and the validity period of the first IP address of the UE corresponding to the first UPF corresponds to the second UPF.
  • the second IP address of the UE then the PCF may send the validity period of the first IP address and the second IP address to the AF corresponding to each target application.
  • the PCF may notify the AF corresponding to the first PDU session by the validity period of the IP address corresponding to the first UPF and the IP address of the second UPF, so that each target application can be
  • the application layer re-selection is performed before the expiration of the first IP address, that is, the second IP address is used for service access, and each target application may select an application server that is closer to the second UPF to continue to provide services.
  • the SMF can only perform UPF reselection for one of the target applications.
  • the policy control method of the UPF reselection proposed by the embodiment of the present invention may notify the UE that the other target being accessed by the UPF reselection event after the target application triggers the UPF reselection, so that the other The target application performs the re-selection of the application layer during the validity period of the first IP address, and does not affect the experience of the other target applications that the UE is accessing; and the technical solution of the embodiment of the present invention is simple, convenient, popularized, and used. A wider range.
  • FIG. 8 is a schematic diagram of a first component structure of a PCF according to an embodiment of the present invention. As shown in FIG. 8, the PCF includes: an obtaining unit 801 and a sending unit 802;
  • the obtaining unit 801 is configured to acquire, from the SMF, an event notification that the first PDU session has an anchor reselection, a validity period of the first IP address of the UE corresponding to the first UPF, and a second IP address of the UE corresponding to the second UPF.
  • the sending unit 802 is configured to send the first IP address and the validity period and the second IP address to the AF corresponding to each target application.
  • the acquiring unit 801 is further configured to acquire the first IP address from the SMF during the establishment of the first PDU session.
  • FIG. 9 is a schematic diagram of a second component structure of a PCF according to an embodiment of the present invention.
  • the PCF further includes: a policy rule setting unit 803, configured to receive first service information corresponding to each target application provided by each AF, and formulate each target application corresponding according to the first service information corresponding to each target application.
  • First strategy rule configured to receive first service information corresponding to each target application provided by each AF, and formulate each target application corresponding according to the first service information corresponding to each target application.
  • the sending unit 802 is further configured to provide a policy rule corresponding to each target application to the SMF.
  • the policy rule setting unit 803 is further configured to receive second service information corresponding to each target application provided by each AF, and formulate a second policy rule corresponding to each target application according to the second service information corresponding to each target application;
  • the sending unit 802 is further configured to provide a second policy rule corresponding to each target application to the SMF.
  • the acquiring unit 801 is further configured to receive an address of a target application server corresponding to each target application provided by each AF;
  • the sending unit 802 is further configured to provide an address of the target application server corresponding to each target application to the SMF.
  • the PCF and the PCF according to the embodiment of the present invention may first notify the event that the anchor point reselection occurs in the first PDU session, and the validity period of the first IP address of the UE corresponding to the first UPF and the second IP address of the UE corresponding to the second UPF. Address; then the PCF can send the validity period of the first IP address and the second IP address to the AF corresponding to each target application.
  • the PCF may notify the AF corresponding to the first PDU session by the validity period of the IP address corresponding to the first UPF and the IP address of the second UPF, so that each target application can be
  • the application layer re-selection is performed before the expiration of the first IP address, that is, the second IP address is used for service access, and each target application may select an application server that is closer to the second UPF to continue to provide services.
  • the SMF can only perform UPF reselection for one of the target applications.
  • the PCF proposed by the embodiment of the present invention may notify the other target that the UE is being accessed to apply the UPF reselection event after the target application triggers the UPF reselection, so that the other target applications are in the first IP.
  • the re-selection of the application layer during the validity period of the address does not affect the experience of the other target applications that the UE is accessing.
  • the technical solution of the embodiment of the present invention is simple, convenient, popularized, and widely used.
  • FIG. 10 is a schematic diagram of a first component structure of an SMF according to an embodiment of the present invention.
  • the SMF includes: an anchor reselection unit 1001 and a notification unit 1002;
  • the anchor point reselecting unit 1001 is configured to perform anchor reselection on the first PDU session when a preset trigger condition is met;
  • the notification unit 1002 is configured to notify the PCF of the event notification that the anchor reselection occurs, the validity period of the first IP address of the UE corresponding to the first UPF, and the second IP address of the UE corresponding to the second UPF.
  • FIG. 11 is a schematic diagram of a second component structure of an SMF according to an embodiment of the present invention.
  • the SMF further includes: an address allocating unit 1003, configured to select the first UPF for the first PDU session, and allocate the first in the process of establishing the first PDU session IP address;
  • the notification unit 1002 is further configured to notify the PCF of the first IP address.
  • the trigger condition includes at least one of the following:
  • the address allocation unit 1003 is further configured to change the first UPF session to a multi-homing Multi-Homing PDU session; select the second UPF for the Multi-Homing PDU session, and allocate the first Two IP addresses.
  • the notifying unit 1002 is further configured to notify the UE that the first PDU session is to be released after the validity period, so that the UE requests to establish a second PDU session; wherein the first The PDU session is the same as the external data network DN corresponding to the second PDU session;
  • the address allocation unit 1003 is further configured to receive the setup request message of the second PDU session sent by the UE, select the second UPF for the second PDU session, and allocate the second IP address.
  • the SMF further includes: a detection rule formulation unit 1004, configured to receive a first policy rule corresponding to each target application defined by the PCF; and formulate, according to the first policy rule corresponding to each target application, a corresponding target application a group detection rule;
  • the notification unit 1002 is further configured to provide a first packet detection rule corresponding to each target application to the second UPF.
  • the detection rule formulation unit 1004 is further configured to receive a second policy rule corresponding to each target application defined by the PCF, and formulate a second packet detection corresponding to each target application according to the second policy rule corresponding to each target application. rule;
  • the notification unit 1002 is further configured to provide a corresponding group detection rule of each target application to the second UPF.
  • the anchor reselection unit 1001 is further configured to receive an address of a source application server corresponding to each target application provided by the PCF;
  • the notification unit 1002 is further configured to provide an address of the source application server corresponding to each target application to the UE.
  • the anchor reselection unit 1001 is further configured to receive an address of a target application server corresponding to each target application provided by the PCF;
  • the notification unit 1002 is further configured to provide an address of a target application server corresponding to each target application to the UE.
  • the SMF when the preset trigger condition is met, the SMF may perform anchor reselection on the first PDU session; then the SMF may notify the event that the anchor reselection occurs and the UE corresponding to the first UPF.
  • the validity period of the first IP address and the second IP address of the UE corresponding to the second UPF are notified to the PCF. That is, in the technical solution of the embodiment of the present invention, the SMF may notify the event that the anchor reselection occurs, the validity period of the first IP address of the UE corresponding to the first UPF, and the second IP of the UE corresponding to the second UPF.
  • the address is notified to the PCF, and then the PCF can notify the AF corresponding to each target application by the validity period of the IP address corresponding to the first UPF and the IP address of the second UPF, so that each target application can be executed before the validity period of the first IP address.
  • the application layer is reselected, that is, the second IP address is used for service access, and each target application can select an application server that is closer to the second UPF to continue to provide services.
  • the SMF can only perform UPF reselection for one of the target applications.
  • the SMF proposed by the embodiment of the present invention may notify the UE that the other target being accessed by the UPF reselection event after the target application triggers the UPF reselection, so that the other target application is in the first IP.
  • the re-selection of the application layer during the validity period of the address does not affect the experience of the other target applications that the UE is accessing.
  • the technical solution of the embodiment of the present invention is simple, convenient, popularized, and widely used.
  • the obtaining unit 801, the sending unit 802, and the policy rule making unit 803 may be implemented by a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP), or a field located in the PCF.
  • Implementation of a program gate array (FPGA) or the like; the anchor reselection unit 1001, the notification unit 1002, and the address assignment unit 1003 may be a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP) located in the SMF.
  • FPGA field programmable gate array
  • the embodiment of the present invention further provides an electronic device, which can implement the functions of the PCF or the SMF.
  • the hardware component of the electronic device is configured as shown in FIG. 12, and the electronic device 110 includes: at least one processor 111, Memory 112 and at least one network interface 114.
  • the various components in electronic device 110 are coupled together by a bus system 115. It will be appreciated that the bus system 115 is used to implement connection communication between these components.
  • the bus system 115 includes a power bus, a control bus, and a status signal bus in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 115 in FIG.
  • the memory 112 can be either volatile memory or non-volatile memory, and can include both volatile and nonvolatile memory.
  • the non-volatile memory may be a ROM, a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), or an electrically erasable device.
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • FRAM Ferromagnetic random access memory
  • Flash Memory Magnetic Surface Memory, Optical Disk, or Read Only Disc (CD) -ROM, Compact Disc Read-Only Memory
  • the magnetic surface memory may be a disk storage or a tape storage.
  • the volatile memory can be a random access memory (RAM) that acts as an external cache.
  • RAM Random Access Memory
  • SRAM Static Random Access Memory
  • SSRAM Synchronous Static Random Access Memory
  • SSRAM Dynamic Random Access
  • DRAM Dynamic Random Access Memory
  • SDRAM Synchronous Dynamic Random Access Memory
  • DDRSDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • ESDRAM enhancement Enhanced Synchronous Dynamic Random Access Memory
  • SLDRAM Synchronous Dynamic Random Access Memory
  • DRRAM Direct Memory Bus Random Access Memory
  • the memory 112 in the embodiment of the present invention is used to store various types of data to support the operation of the electronic device 110.
  • Examples of such data include any computer program, such as application 1122, for operating on electronic device 110.
  • a program implementing the method of the embodiment of the present invention may be included in the application 1122.
  • the method disclosed in the foregoing embodiments of the present invention may be applied to the processor 111 or implemented by the processor 111.
  • the processor 111 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 111 or an instruction in a form of software.
  • the processor 111 described above may be a general purpose processor, a digital signal processor (DSP), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or the like.
  • DSP digital signal processor
  • the processor 111 can implement or perform the various methods, steps, and logic blocks disclosed in the embodiments of the present invention.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiment of the present invention may be directly implemented as a hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can reside in a storage medium located in memory 112, and processor 111 reads the information in memory 112 and, in conjunction with its hardware, performs the steps of the foregoing method.
  • the electronic device 110 may be configured by one or more Application Specific Integrated Circuits (ASICs), DSPs, Programmable Logic Devices (PLDs), and Complex Programmable Logic Devices (CPLDs). , Complex Programmable Logic Device), FPGA, general purpose processor, controller, MCU, MPU, or other electronic component implementation for performing the aforementioned methods.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal processors
  • PLDs Programmable Logic Devices
  • CPLDs Complex Programmable Logic Devices
  • FPGA field-programmable Logic Device
  • controller MCU
  • MPU or other electronic component implementation for performing the aforementioned methods.
  • the embodiment of the present invention further provides a storage medium, where an executable program is stored, and when the executable program is executed by the processor, the foregoing policy control method for UPF reselection performed by the PCF is implemented.
  • the embodiment of the present invention further provides another storage medium, which stores an executable program, and when the executable program is executed by the processor, implements the policy control method of the UPF reselection performed by the foregoing SMF.
  • the respective units in the present embodiment may exist physically separately, or two or more units may be integrated in one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software function module.
  • the integrated unit can be stored in a readable storage medium if it is implemented in the form of a software function module and is not sold or used as a stand-alone product.
  • the technical solution of the embodiment is essentially or The portion contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for causing a host (which may be a personal mobile device)
  • a terminal, a server, or a network device, or the like, or a processor performs all or part of the steps of the method described in this embodiment.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes.
  • the program instruction corresponding to the policy control method of the UPF reselection in this embodiment may be stored on a storage medium such as an optical disk, a hard disk, a U disk, or the like, and a program corresponding to the policy control method of the UPF reselection in the storage medium.
  • a storage medium such as an optical disk, a hard disk, a U disk, or the like
  • a program corresponding to the policy control method of the UPF reselection in the storage medium When the instruction is read or executed by an electronic device, the following steps are included:
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) in which the program code available for the computer is incorporated.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • the SMF when the preset trigger condition is met, the SMF performs anchor reselection on the first PDU session; the event notification of the anchor reselection occurs, and the first IP address of the UE corresponding to the first UPF.
  • the validity period and the second IP address of the UE corresponding to the second UPF are notified to the PCF; the PCF acquires an event notification of the anchor reselection of the first PDU session from the SMF, and acquires the validity period of the first IP address of the UE corresponding to the first UPF.
  • a second IP address of the UE corresponding to the second UPF sending the validity period of the first IP address and the second IP address to the AF corresponding to each target application.
  • the target application may notify the other target that the UE is being accessed to apply the UPF reselection event, so that the other target applications perform the application layer reselection within the validity period of the first IP address, and the UE is not
  • the experience of the other target apps being accessed has an impact.

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Abstract

本发明实施例公开了一种用户面功能实体(UPF)重选的策略控制方法、策略控制功能实体(PCF)及会话管理功能实体(SMF)，所述方法包括：从SMF获取第一协议数据单元(PDU)会话发生锚点重选的事件以及第一UPF对应的用户设备(UE)的第一网络协议(IP)地址的有效期和第二UPF对应的UE的第二IP地址；将所述第一IP地址的有效期和所述第二IP地址发送给所述各个目标应用对应的应用功能实体(AF)。

Description

用户面功能实体重选的策略控制方法、设备及存储介质
相关申请的交叉引用
本申请基于申请号为201710377964.1、申请日为2017年5月25日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及移动通信技术，尤其涉及一种用户面功能实体(User Plane Function，UPF)重选的策略控制方法、设备及存储介质。
背景技术
目前业界正在研究下一代无线通信系统，即第五代移动通信技术(5th-generation，简称5G)。图1为现有基于单协议数据单元(Protocol Data Unit，PDU)会话的5G网络的组成结构示意图。如图1所示，5G网络包括以下功能：连接管理功能：主要负责终端接入网络的空口资源调度以及空口的连接管理；认证服务功能：主要负责对用户设备(User Equipment，UE)的接入进行认证和授权；统一数据管理(Unified Data Manager，UDM)功能：主要负责保存用户的签约数据；接入和移动性管理功能(Access and Mobility Management Function，AMF)：主要负责接入认证、授权以及移动性管理；会话管理功能(Session Management Function，SMF)，主要负责会话管理、网络协议(Internet Protocol，IP)地址分配；UPF，主要负责PDU的路由、转发，以及对分组数据的策略执行。策略控制功能(Policy Control Function，PCF)，主要负责策略决策；应用功能(Application Function，AF)，主要负责向PCF提供用户访问业务的业务信息，用于PCF的策略决策。
此外，5G网络中定义了会话和业务连续性(Session and Service Continuity， SSC)的三种模式：1)、模式(Mode)1：无论UE使用的接入网如何变化，UPF保持不变；2)、模式2：UE不离开UPF的服务区域时，UPF保持不变；当UE离开UPF的服务区域时，一个适合于UE当前接入网附着点的不同的UPF将用于服务该UE；3)、模式3：UE被允许在第一PDU会话终结前，新建一个到同一个数据网络的PDU会话，并且网络选择一个适合UE的第二UPF。此时，UE可以将应用从第一UPF迁移到第二UPF后释放第一UPF；或者，UE等待绑定在第一UPF上的应用结束后释放第一UPF。
图2为相关技术中基于多归属(Multi-Homed)PDU会话的5G网络的组成结构示意图。如图2所示，当UE发生移动时，网络在UE的用户面链路中引入了分叉点(Branching point)并且分配一个新的UPF，即第二用户面功能实体(第二UPF)，同时网络也会给UE分配另外一个IP地址。上行方向，分叉点将UE采用新的IP地址的数据转发给第二用户面功能实体(第二UPF)，采用旧的IP地址的数据仍然转发给第一用户面功能实体(第一UPF)。在下行方向，分叉点将来自第一用户面功能实体(第一UPF)和第二用户面功能实体(第二UPF)的数据汇聚后转发给基站。在实际部署时，分叉点可能和第二用户面功能实体2(第二UPF)集成。
图3为相关技术中UPF重选的策略控制方法的实现流程示意图。如图3所示，UPF重选的策略控制方法可以包括以下步骤：
步骤301、UE与第一UPF之间建立第一PDU会话。
步骤302、SMF满足预先设置的触发条件时，SMF执行Multi-Homed决策。
步骤303、SMF向UE发送NAS消息通知。
在本步骤中，SMF通知UE第一PDU会话在一段时间(Time1)后将被释放，同时SMF通知UE请求建立一个到同一个外部数据网络DN(Data Network)的第二PDU会话。
步骤304、UE向SMF发送消息以建立与第二UPF之间的第二PDU会话。
步骤305、释放UE与第一UPF之间的第一PDU会话。
在实现本发明的过程中，发明人发现现有技术中至少存在如下问题：
在现有的UPF重选的策略控制方法中是由SMF决定是否进行UPF重选，尽管当SMF满足预先设置的触发条件时，可以根据第三方应用的请求将该第三方应用从第一UPF重选到第二UPF，但是由于SMF只能针对其中一个目标应用进行UPF重选，因此，对于UE正在访问的其他目标应用，SMF没有方法让这些目标应用从第一UPF重选到第二UPF中，这样就会对UE正在访问的其他目标应用的使用体验产生影响。
发明内容
为解决现有存在的技术问题，本发明实施例期望提供一种UPF重选的策略控制方法、设备及存储介质，可以因为一个目标应用触发UPF重选后，通知UE正在访问的其他目标应用UPF重选的事件，以便其他目标应用在第一IP地址的有效期内进行应用层的重选，不会对UE正在访问的其他目标应用的使用体验产生影响。
为达到上述目的，本发明实施例的技术方案是这样实现的：
本发明实施例提供了一种UPF重选的策略控制方法，所述方法包括：
从SMF获取第一PDU会话发生锚点重选的事件通知以及第一UPF对应的用户设备UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；
将所述第一IP地址的有效期和所述第二IP地址发送给各个目标应用对应的AF。
在上述实施例中，在所述从SMF获取所述第一PDU会话发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址之前，所述方法还包括：
在所述第一PDU会话的建立过程中，从所述SMF获取所述第一IP地址。
在上述实施例中，在所述从SMF获取第一PDU会话发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址之前，所述方法还包括：
接收各个AF提供的各个目标应用对应的第一业务信息；
根据各个目标应用对应的第一业务信息制定各个目标应用对应的第一策略规则；
将各个目标应用对应的策略规则提供给所述SMF。
在上述实施例中，在所述将所述第一IP地址的有效期和所述第二IP地址发送给各个目标应用对应的AF之后，所述方法还包括：
接收各个AF提供的各个目标应用对应的第二业务信息；
根据各个目标应用对应的第二业务信息制定各个目标应用对应的第二策略规则；
将各个目标应用对应的第二策略规则提供给所述SMF。
在上述实施例中，在所述将所述第一IP地址的有效期和所述第二IP地址发送给各个目标应用对应的AF之后，所述方法还包括：
接收各个AF提供的各个目标应用对应的目标应用服务器的地址；
将各个目标应用对应的目标应用服务器的地址提供给所述SMF。
本发明实施例还提供了一种UPF重选的策略控制方法，所述方法包括：
当满足预先设置的触发条件时，对第一PDU会话执行锚点重选；
将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF。
在上述实施例中，在所述对第一PDU会话执行锚点重选之前，所述方法还包括：
在所述第一PDU会话的建立过程中，为所述第一PDU会话选择所述第一UPF，分配所述第一IP地址；
将所述第一IP地址通知给所述PCF。
在上述实施例中，所述触发条件至少包括以下其中之一：
接收到任意一个目标应用发送的流量导向请求；
或者，所述第一UPF的网络负荷超过预先设置的门限值；
或者，接收到所述第一UPF发送的用户面检测信息的上报。
在上述实施例中，在所述对所述第一UPF执行锚点重选之后，所述方法还 包括：
将所述第一UPF会话更改为多归属Multi-Homing PDU会话；
为所述Multi-Homing PDU会话选择所述第二UPF，并分配所述第二IP地址。
在上述实施例中，在所述对第一PDU会话执行锚点重选之后，所述方法还包括：
通知所述UE所述第一PDU会话在所述有效期后将被释放，以使所述UE请求建立一个第二PDU会话；其中，所述第一PDU会话与所述第二PDU会话对应的外部数据网络DN相同；
接收所述UE发送的所述第二PDU会话的建立请求消息，为所述第二PDU会话选择所述第二UPF，并分配所述第二IP地址。
在上述实施例中，在所述对第一PDU会话执行锚点重选之前，所述方法还包括：
接收所述PCF制定的各个目标应用对应的第一策略规则；
根据各个目标应用对应的第一策略规则制定各个目标应用对应的第一分组检测规则；
将各个目标应用对应的第一分组检测规则提供给所述第二UPF。
在上述实施例中，在所述将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给所述PCF之后，所述方法还包括：
接收所述PCF制定的各个目标应用对应的第二策略规则；
根据各个目标应用对应的第二策略规则制定各个目标应用对应的第二分组检测规则；
将各个目标应用的对应的分组检测规则提供给所述第二UPF。
在上述实施例中，在所述对第一PDU会话执行锚点重选之前，所述方法还包括：
接收所述PCF提供的各个目标应用对应的源应用服务器的地址；
将各个目标应用对应的源应用服务器的地址提供给所述UE。
在上述实施例中，在所述将发生锚点重选的事件通知以及所述第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF之后，所述方法还包括：
接收所述PCF提供的各个目标应用对应的目标应用服务器的地址；
将各个目标应用对应的目标应用服务器的地址提供给所述UE。
本发明实施例还提供了一种PCF，所述PCF包括：获取单元和发送单元；其中，
所述获取单元，配置为从SMF获取第一PDU会话发生锚点重选的事件通知，以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；
将所述第一IP地址和有效期和所述第二IP地址发送给各个目标应用对应的AF。
在上述实施例中，所述获取单元，还配置为在所述第一PDU会话的建立过程中，从所述SMF获取所述第一IP地址。
在上述实施例中，所述PCF还包括：策略规则制定单元，配置为接收各个AF提供的各个目标应用对应的第一业务信息；根据各个目标应用对应的第一业务信息制定各个目标应用对应的第一策略规则；
所述发送单元，还配置为将各个目标应用对应的策略规则提供给所述SMF。
在上述实施例中，所述策略规则制定单元，还配置为接收各个AF提供的各个目标应用对应的第二业务信息；根据各个目标应用对应的第二业务信息制定各个目标应用对应的第二策略规则；
所述发送单元，还配置为将各个目标应用对应的第二策略规则提供给所述SMF。
在上述实施例中，所述获取单元，还配置为接收各个AF提供的各个目标应用对应的目标应用服务器的地址；
所述发送单元，还配置为将各个目标应用对应的目标应用服务器的地址提供给所述SMF。
本发明实施例还提供了一种SMF，所述SMF包括：锚点重选单元和通知单元；其中，
所述锚点重选单元，配置为当满足预先设置的触发条件时，对第一PDU会话执行锚点重选；
所述通知单元，配置为将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF。
在上述实施例中，所述SMF还包括：地址分配单元，配置为在所述第一PDU会话的建立过程中，为所述第一PDU会话选择所述第一UPF，分配所述第一IP地址；
所述通知单元，还配置为将所述第一IP地址通知所述PCF。
在上述实施例中，所述触发条件至少包括以下其中之一：
接收到任意一个目标应用发送的流量导向请求；
或者，所述第一UPF的网络负荷超过预先设置的门限值；
或者，接收到所述第一UPF发送的用户面检测信息的上报。
在上述实施例中，所述地址分配单元，还配置为将所述第一UPF会话更改为Multi-Homing PDU会话；为所述Multi-Homing PDU会话选择所述第二UPF，并分配所述第二IP地址。
在上述实施例中，所述通知单元，还配置为通知所述UE所述第一PDU会话在所述有效期后将被释放，以使所述UE请求建立一个第二PDU会话；其中，所述第一PDU会话与所述第二PDU会话对应的外部数据网络DN相同；
所述地址分配单元，还配置为接收所述UE发送的所述第二PDU会话的建立请求消息，为所述第二PDU会话选择所述第二UPF，并分配所述第二IP地址。
在上述实施例中，所述SMF还包括：检测规则制定单元，配置为接收所述PCF制定的各个目标应用对应的第一策略规则；根据各个目标应用对应的第一 策略规则制定各个目标应用对应的第一分组检测规则；
所述通知单元，还配置为将各个目标应用对应的第一分组检测规则提供给所述第二UPF。
在上述实施例中，所述检测规则制定单元，还配置为接收所述PCF制定的各个目标应用对应的第二策略规则；根据各个目标应用对应的第二策略规则制定各个目标应用对应的第二分组检测规则；
所述通知单元，还配置为将各个目标应用的对应的分组检测规则提供给所述第二UPF。
在上述实施例中，所述锚点重选单元，还配置为接收所述PCF提供的各个目标应用对应的源应用服务器的地址；
所述通知单元，还配置为将各个目标应用对应的源应用服务器的地址提供给所述UE。
在上述实施例中，所述锚点重选单元，还配置为接收所述PCF提供的各个目标应用对应的目标应用服务器的地址；
所述通知单元，还配置为将各个目标应用对应的目标应用服务器的地址提供给所述UE。
本发明实施例还提供一种PCF，包括：处理器以及存储有所述处理器可执行指令的存储器，当所述指令被处理器执行时，执行：
从SMF获取第一PDU会话发生锚点重选的事件通知，以及获取第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；
将所述第一IP地址的有效期和所述第二IP地址发送给各个目标应用对应的AF。
本发明实施例还提供一种SMF，包括：处理器以及存储有所述处理器可执行指令的存储器，当所述指令被处理器执行时，执行：
当满足预先设置的触发条件时，对第一PDU会话执行锚点重选；
将发生锚点重选的事件通知、以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF。
本发明实施例还提供一种存储介质，所述存储介质中存储有计算机可执行指令，该计算机可执行指令用于执行：
从SMF获取第一PDU会话发生锚点重选的事件通知，以及获取第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；
将所述第一IP地址的有效期和所述第二IP地址发送给各个目标应用对应的AF。
本发明实施例还提供另一种存储介质，所述存储介质中存储有计算机可执行指令，该计算机可执行指令用于执行：
当满足预先设置的触发条件时，对第一PDU会话执行锚点重选；
将发生锚点重选的事件通知、以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF。
由此可见，本发明实施例的技术方案中，PCF可以先从SMF获取第一PDU会话发生锚点重选的事件通知，以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；然后PCF可以将第一IP地址的有效期和第二IP地址发送给各个目标应用对应的AF。也就是说，在本发明实施例的技术方案中，PCF可以将第一UPF对应的IP地址的有效期和第二UPF的IP地址通知给各个目标应用对应的AF，以使各个目标应用可以在第一IP地址的有效期内前执行应用层的重选，即采用第二IP地址进行业务访问，各个目标应用可以选择一个更靠近第二UPF的应用服务器继续提供业务。而现有技术中，SMF只能针对其中一个目标应用进行UPF重选。因此，和现有技术相比，本发明实施例提出的UPF重选的策略控制方法、PCF及SMF，可以因为一个目标应用触发UPF重选后，通知UE正在访问的其他目标应用UPF重选的事件，以便其他目标应用在第一IP地址的有效期内进行应用层的重选，不会对UE正在访问的其他目标应用的使用体验产生影响；并且，本发明实施例的技术方案实现简单方便，便于普及，使用范围更广。
附图说明
图1为现有基于单PDU会话的5G网络的组成结构示意图；
图2为现有基于多归属PDU会话的5G网络的组成结构示意图；
图3为相关技术中UPF重选的策略控制方法的实现流程示意图；
图4为本发明实施例中UPF重选的策略控制方法的第一实现流程示意图；
图5为本发明实施例中UPF重选的策略控制方法的第二实现流程示意图；
图6为本发明实施例中UPF重选的策略控制方法的第三实现流程示意图；
图7为本发明实施例中UPF重选的策略控制方法的第四实现流程示意图；
图8为本发明实施例中PCF的第一组成结构示意图；
图9为本发明实施例中PCF的第二组成结构示意图；
图10为本发明实施例中SMF的第一组成结构示意图；
图11为本发明实施例中SMF的第二组成结构示意图；
图12为本发明实施例提供的设备的硬件组成结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。
在本发明的具体实施例中，图4为本发明实施例中UPF重选的策略控制方法的第一实现流程示意图。如图4所示，UPF重选的策略控制方法可以包括以下步骤：
步骤401、从SMF获取第一PDU会话发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址。
在本发明的具体实施例中，PCF从SMF获取第一PDU会话发生锚点重选的事件通知，第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址。较佳地，在本发明的具体实施例中，PCF在从SMF获取第一PDU会话发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址之前，PCF可以在第一PDU会 话的建立过程中，从SMF获取第一IP地址。较佳地，在本发明的具体实施例中，PCF在从PCF在从SMF获取第一PDU会话发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址之前，PCF还可以接收各个AF提供的各个目标应用对应的第一业务信息；根据各个目标应用对应的第一业务信息制定各个目标应用对应的第一策略规则；将各个目标应用对应的策略规则提供给SMF。
步骤402、将第一IP地址的有效期和第二IP地址发送给各个目标应用对应的AF。
在本发明的具体实施例中，PCF将第一IP地址的有效期和第二IP地址发送给各个目标应用对应的AF。较佳地，在本发明的具体实施例中，PCF在将第一IP地址的有效期和第二IP地址发送给各个目标应用对应的AF之后，PCF还可以接收各个AF提供的各个目标应用对应的第二业务信息；根据各个目标应用对应的第二业务信息制定各个目标应用对应的第二策略规则；将各个目标应用对应的第二策略规则提供给SMF。较佳地，在本发明的具体实施例中，PCF在将第一IP地址的有效期和第二IP地址发送给各个目标应用对应的AF之后，PCF还可以接收各个AF提供的各个目标应用对应的目标应用服务器的地址；将各个目标应用对应的目标应用服务器的地址提供给SMF。
本发明实施例提出的UPF重选策略控制方法，PCF可以先从第一PDU会话发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；然后PCF可以将第一IP地址的有效期和第二IP地址发送给各个目标应用对应的AF。也就是说，在本发明实施例的技术方案中，PCF可以将第一UPF对应的IP地址的有效期和第二UPF的IP地址通知给第一PDU会话对应的AF，以使各个目标应用可以在第一IP地址的有效期内前执行应用层的重选，即采用第二IP地址进行业务访问，各个目标应用可以选择一个更靠近第二UPF的应用服务器继续提供业务。而现有技术中，SMF只能针对其中一个目标应用进行UPF重选。因此，和现有技术相比，本发明实施例提出的UPF重选的策略控制方法，可以因为一个目标应用触发UPF重选 后，通知其他目标应用UPF重选的事件，以便其他目标应用在第一IP地址的有效期内进行应用层的重选，不会对UE正在访问的其他目标应用的使用体验产生影响；并且，本发明实施例的技术方案实现简单方便，便于普及，使用范围更广。
图5为本发明实施例中UPF重选的策略控制方法的第二实现流程示意图。如图5所示，UPF重选的策略控制方法可以包括以下步骤：
步骤501、当满足预先设置的触发条件时，对第一PDU会话执行锚点重选。
在本发明的具体实施例中，当满足预先设置的触发条件时，SMF对第一PDU会话执行锚点重选。较佳地，在本发明的具体实施例中，SMF在对第一PDU会话执行锚点重选之前，SMF可以在第一PDU会话的建立过程中，SMF为为第一PDU会话选择第一UPF，分配第一IP地址；将第一IP地址通知给PCF。较佳地，在本发明的具体实施例中，触发条件至少包括以下其中之一：SMF接收到任意一个目标应用发送的流量导向请求；或者，第一UPF的网络负荷超过预先设置的门限值；或者，SMF接收到第一UPF发送的用户面检测信息的上报。较佳地，在本发明的具体实施例中，SMF在对第一UPF执行锚点重选之后，SMF还可以将第一UPF会话更改为多归属Multi-Homing PDU会话；为Multi-Homing PDU会话选择第二UPF，并分配第二IP地址。较佳地，在本发明的具体实施例中，SMF在对第一PDU会话执行锚点重选之后，SMF还可以通知UE第一PDU会话在有效期后将被释放，以使UE请求建立一个第二PDU会话；其中，第一PDU会话与第二PDU会话对应的外部数据网络DN相同；SMF接收UE发送的第二PDU会话的建立请求消息，为第二PDU会话选择第二UPF，并分配第二IP地址。较佳地，在本发明的具体实施例中，SMF在对第一PDU会话执行锚点重选之前，SMF还可以接收PCF制定的各个目标应用对应的第一策略规则；根据各个目标应用对应的第一策略规则制定各个目标应用对应的第一分组检测规则；将各个目标应用对应的第一分组检测规则提供给第二UPF。较佳地，在本发明的具体实施例中，SMF在对第一PDU会话执行锚点重选之前，SMF还可以接收PCF提供的各个目标应用对应的源应用服务器 的地址；将各个目标应用对应的源应用服务器的地址提供给UE。
步骤502、将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF。
在本发明的具体实施例中，SMF将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF。较佳地，在本发明的具体实施例中，SMF在将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF之后，SMF还可以接收PCF制定的各个目标应用对应的第二策略规则；根据各个目标应用对应的第二策略规则制定各个目标应用对应的第二分组检测规则；将各个目标应用的对应的分组检测规则提供给第二UPF。较佳地，在本发明的具体实施例中，SMF在将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF之后，SMF还可以接收PCF提供的各个目标应用对应的目标应用服务器的地址；将各个目标应用对应的目标应用服务器的地址提供给UE。
本发明实施例提出的UPF重选策略控制方法，当满足预先设置的触发条件时，SMF可以对第一PDU会话执行锚点重选；然后SMF可以将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF。也就是说，在本发明实施例的技术方案中，SMF可以将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF，然后PCF可以将第一UPF对应的IP地址的有效期和第二UPF的IP地址通知给各个目标应用对应的AF，以使各个目标应用可以在第一IP地址的有效期内前执行应用层的重选，即采用第二IP地址进行业务访问，各个目标应用可以选择一个更靠近第二UPF的应用服务器继续提供业务。而现有技术中，SMF只能针对其中一个目标应用进行UPF重选。因此，和现有技术相比，本发明实施例提出的UPF重选的策略控制方法，可以因为一个目标应用触发UPF重选后，通知UE正在访问 的其他目标应用UPF重选的事件，以便其他目标应用在第一IP地址的有效期内进行应用层的重选，不会对UE正在访问的其他目标应用的使用体验产生影响；并且，本发明实施例的技术方案实现简单方便，便于普及，使用范围更广。
图6为本发明实施例中UPF重选的策略控制方法的第三实现流程示意图。如图6所示，UPF重选的策略控制方法可以包括以下步骤：
步骤601、UE通过基站向AMF发起附着流程，完成UE在AMF中的网络注册。
步骤602、UE向AMF发起第一PDU会话的PDU会话建立请求消息；其中，所述PDU会话建立请求消息中可以携带第一PDU会话标识、请求类型、N1会话管理信息(SM Information)和数据网标识(Data Network Name，DN Name)。
步骤603、AMF向所选择的SMF发送会话管理请求消息；其中，所述会话管理请求消息中可以携带用户标识；DN Name、第一DPU会话标识、用户位置信息、SSC Mode以及N1会话管理信息(N1 SM Information)。
步骤604、SMF为第一PDU会话选择一个UPF作为锚点UPF(表示为第一UPF)，并为UE分配该锚点UPF对应的IP地址(这里是IPv6 prefix1，表示为第一IP地址)。SMF向PCF发送第一PDU会话对应的第一策略请求消息；其中，所述第一策略请求消息中可以携带用户标识、DN Name、SSC Mode和IPv6 prefix1。
在本步骤中，SMF在向PCF发送第一PDU会话对应的策略请求消息之前，SMF还可以与统一数据管理UDM交互，获取用户的签约信息，并对UE进行校验。此外，SMF还可以向PCF上报UE支持Multi-Homed的能力指示。
步骤605、PCF向SMF返回第一策略确认消息；其中，所述第一策略确认消息中可以携带默认策略。
在本发明的具体实施例中，所述默认策略可以包括：聚合最大速率(Aggregate Maximum Bit Rat，AMBR)、QoS参数以及事件触发器event trigger。
步骤606、SMF向第一UPF发送N4会话建立请求消息；第一UPF向SMF 返回N4会话建立确认消息；其中，所述N4会话建立请求消息中可以携带分组检测规则。
在本发明的具体实施例中，第一UPF在接收到SMF发送的N4会话建立请求消息之后，第一UPF可以安装/激活该N4会话建立请求消息中携带的分组检测规则，并向SMF返回N4会话建立确认消息。若第一UPF分配CN隧道信息，第一UPF向SMF返回的N4会话建立确认消息中还可以携带该CN隧道信息。
步骤607、SMF向AMF发送会话管理应答消息；其中，所述会话管理应答消息中可以携带N2会话管理信息(N2 SM Information)和N1会话管理信息(N1 SM Information)。
步骤608、AMF向基站发送N2 PDU会话请求消息；其中，所述N2 PDU会话请求消息中可以携带N2会话管理信息和NAS信息。
步骤609、基站向UE发送接入网络AN(Access Network)特定的信令；并向UE提供从SMF接收到的信息。
步骤610、基站向AMF发送N2 PDU会话应答消息；其中，所述N2 PDU会话应答消息中可以携带第一PDU会话标识以及N2会话管理信息。
步骤611、AMF向SMF发送N2会话管理请求消息；其中，所述N2会话管理请求消息中可以携带N2会话管理信息。
步骤612、AMF向第一UPF发送N4会话建立请求消息；第一UPF向AMF返回N4会话建立确认消息。
步骤613、SMF向AMF返回N2会话管理应答消息。
步骤614、SMF通过第一UPF向UE发送IPv6路由通告(Router Advertisement，RA)消息；其中，所述IPv6路由通告消息中可以携带第一IP地址。
在本发明的具体实施例中，UE通过建立的第一PDU会话进行业务访问，并且可以同时访问多个目标应用。各个目标应用对应的AF可以直接与PCF进行交互；也可以通过NEF与PCF进行交互，向PCF提供相关的业务信息用于PCF的策略决策。AF向PCF提供的各个目标应用对应的第一业务信息中可以 携带第一IP地址、第一媒体描述组件以及第一次请求的带宽等信息；AF向PCF提供的各个目标应用对应的第二业务信息中可以携带第二IP地址、第二媒体描述组件以及第二次请求的带宽等信息。
步骤615、SMF满足预先设置的触发条件时，SMF对第一PDU会话执行Multi-Homed决策。
在本发明的具体实施例中，所述触发条件可以包括：SMF接收到任意一个目标应用发送的流量导向请求；或者，第一UPF的网络负荷超过预先设置的门限值；或者，SMF接收到第一UPF发送的用户面检测信息的上报。也就是说，任意一个第三方应用可能发现UE的位置以及第一UPF的位置已经不是访问该第三方应用的最佳路径，该第三方应用可以向SMF发送流量导向请求，SMF在接收到第三方应用发送的流量导向请求后，SMF可以决定重选UPF；或者，当第一UPF的网络负荷超过预先设置的门限值时，SMF可以决定重选UPF；或者，SMF接收用户面检测信息的上报，SMF可以决定重选UPF。
步骤616、SMF选择一个新的UPF作为新的锚点UPF(表示为第二UPF)，并为UE分配新的锚点UPF对应的新的IP地址(这里是IPv6 perfix2，表示为第二UPF)。SMF向PCF发送第一PDU会话对应的第二策略请求消息；其中，其中，所述第二策略请求消息中至少可以携带IPv6 prefix1、IPv6 prefix2以及IPv6 prefix1的有效期。
步骤617、PCF进行策略授权。PCF决定安装或激活第二UPF的策略规则。PCF向SMF返回第二策略确认消息。
步骤618、SMF会选择一个UPF(表示为第三UPF)作为分叉点(Branching Point，BP)；SMF向第二UPF发送N4会话建立请求消息；第二UPF向SMF返回N4会话建立确认消息；其中，所述N4会话建立请求消息中可以携带分组检测规则。
在本发明的具体实施例中，第二UPF在接收到SMF发送的N4会话建立请求消息之后，第二UPF可以安装/激活该N4会话建立请求消息中携带的分组检测规则，并向SMF返回N4会话建立确认消息。若第二UPF分配CN隧道信息， 第二UPF向SMF返回的N4会话建立确认消息中还可以携带该CN隧道信息。
步骤619、SMF向BP发送N4会话建立消息；BP向SMF返回N4会话确认消息；其中，N4会话建立消息中可以携带第一UPF的隧道信息、第二UPF的隧道信息以及RAN的隧道信息。
在本发明的具体实施例中，SMF还可以向BP发送分组检测规则，用于将源地址与IPv6 prefix1匹配的上行数据转发给第一UPF，将源地址与IPv6 prefix2匹配的上行数据转发给第二UPF；同时将来自第一UPF或者第二UPF的下行数据发送给RAN。若CN隧道信息是第一UPF分配的，BP向SMF返回的N4会话确认消息中可以携带BP的隧道信息。
步骤620、若CN隧道信息是第二UPF分配的，SMF向第二UPF发送N4会话修改请求消息；第二UPF向SMF返回N4会话修改确认消息；其中，所述N4会话修改请求消息中携带BP的隧道信息。
步骤621、SMF向第一UPF发送N4会话修改请求消息；第一UPF向SMF返回N4会话修改确认消息；其中，所述N4会话修改请求消息中携带BP的隧道信息。
步骤622、SMF通过AMF向基站发送会话修改请求消息；基站通过AMF向SMF返回会话修改应答消息；其中，所述会话修改请求消息中可以携带BP的隧道信息。
步骤623、SMF通过第一UPF向UE发送IPv6路由通告消息(IPv6 RA消息)；其中，所述IPv6 RA消息中可以携带第一IP地址和有效期。
步骤624、SMF通过第二UPF向UE发送IPv6 RA消息；其中，所述IPv6RA消息中可以携带第二IP地址。
步骤625、PCF进行策略决策。
在本步骤中，PCF决定UE正在访问的，并且需要进行业务流迁移的各个目标应用；此外，PCF还需要考虑各个目标应用是否支持应用层重选。这些目标应用是在第一PDU会话建立后，通过AF与PCF交互，提供业务信息并请求对业务进行QoS保障的应用。
步骤626、PCF向目标应用对应的AF发送UPF重选请求消息；其中，所述UPF重选消息中至少可以携带第一IP地址的有效期和第二IP地址。可选地，所述UPF重选消息还可以携带第二UPF的位置信息。
步骤627、在第一IP地址的有效期内，各个目标应用与UE进行交互，进行应用层的重选，UE采用新的IPv6 Prefix 2生成的IP地址(即第二IP地址)进行访问，各个目标应用可能选择一个更靠近的第二UPF的目标应用服务器继续提供访问，那么UE需要与各个目标应用服务器进行交互。
步骤628、各个目标应用对应的AF向PCF返回UPF重选确认消息；其中，所述UPF重选确认消息中可以携带应用层重选后的各个第二业务信息。可选地，所述UPF重选确认消息中还可以携带各个目标应用服务器的地址。
步骤629、PCF根据AF返回的确认消息更新策略决策，PCF根据AF提供的各个目标应用的第二业务信息执行策略。PCF与SMF交互，提供需要迁移的目标应用的策略规则，若AF提供了目标应用的目标应用服务器的地址，则在确认消息中还可以携带目标应用服务器的地址。
步骤630、SMF向第二UPF发送N4会话建立请求消息，用于向第二UPF提供各个目标应用对应的策略规则；第二UPF向SMF返回N4会话建立确认消息。
步骤631、SMF通过第二UPF向UE发送IPv6 RA消息；其中，所述IPv6RA消息可以携带第二IP地址(即IPv6 Prefixe2)和路由选项信息；其中，所述路由选项信息中可以携带目标应用服务器的地址。
在本发明的具体实施例中，针对每一PCF确定需要通知的应用，执行步骤626-步骤631。
本发明实施例提出的UPF重选的策略控制方法，PCF可以先从第一PDU会话发生锚点重选的事件通知，以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；然后PCF可以将第一IP地址的有效期和第二IP地址发送给各个目标应用对应的AF。也就是说，在本发明实施例的技术方案中，PCF可以将第一UPF对应的IP地址的有效期和第二UPF的IP 地址通知给第一PDU会话对应的AF，以使各个目标应用可以在第一IP地址的有效期内前执行应用层的重选，即采用第二IP地址进行业务访问，各个目标应用可以选择一个更靠近第二UPF的应用服务器继续提供业务。而现有技术中，SMF只能针对其中一个目标应用进行UPF重选。因此，和现有技术相比，本发明实施例提出的UPF重选的策略控制方法，可以因为一个目标应用触发UPF重选后，通知UE正在访问的其他目标应用UPF重选的事件，以便其他目标应用在第一IP地址的有效期内进行应用层的重选，不会对UE正在访问的其他目标应用的使用体验产生影响；并且，本发明实施例的技术方案实现简单方便，便于普及，使用范围更广。
图7为本发明实施例中UPF重选的策略控制方法的第四实现流程示意图。如图7所示，UPF重选的策略控制方法可以包括以下步骤：
步骤701、UE通过基站向AMF发起附着流程，完成UE在AMF中的网络注册。
步骤702、UE向AMF发起第一PDU会话的PDU会话建立请求消息；其中，所述PDU会话建立请求消息中可以携带第一PDU会话标识、请求类型、N1会话管理信息(SM Information)和数据网标识(Data Network Name，DN Name)。
步骤703、AMF向所选择的SMF发送会话管理请求消息；其中，所述会话管理请求消息中可以携带用户标识；DN Name、第一PDU会话标识、用户位置信息、SSC Mode以及N1会话管理信息(N1 SM Information)。
步骤704、SMF为第一PDU会话选择一个UPF作为锚点UPF(表示为第一UPF)，并为UE分配该锚点UPF对应的IP地址(这里是IPv6 prefix1或者IPv4 address 1，表示为第一IP地址)。SMF向PCF发送第一PDU会话对应的第一策略请求消息；其中，所述第一策略请求消息中可以携带用户标识、DN Name、SSC Mode和第一IP地址。
在本步骤中，SMF在向PCF发送PDU会话对应的策略请求消息之前，SMF还可以与统一数据管理UDM交互，获取用户的签约信息，并对UE进行校验。
步骤705、PCF向SMF返回第一策略确认消息；其中，所述第一策略确认消息中可以携带默认策略。
在本发明的具体实施例中，所述默认策略可以包括：聚合最大速率(Aggregate Maximum Bit Rat，AMBR)、QoS参数以及事件触发器event trigger。
步骤706、SMF向第一UPF发送N4会话建立请求消息；第一UPF向SMF返回N4会话建立确认消息；其中，所述N4会话建立请求消息中可以携带分组检测规则。
步骤707、SMF向AMF发送会话管理应答消息；其中，所述会话管理应答消息中可以携带N2会话管理信息(N2 SM Information)和N1会话管理信息(N1 SM Information)。
步骤708、AMF向基站发送N2 PDU会话请求消息；其中，所述N2 PDU会话请求消息中可以携带N2会话管理信息和NAS信息。
步骤709、基站向UE发送AN特定的信令；并向UE提供从SMF接收到的信息。
步骤710、基站向AMF发送N2 PDU会话应答消息；其中，所述N2 PDU会话应答消息中可以携带第一PDU会话标识以及N2会话管理信息(N2 SM Information)。
步骤711、AMF向SMF发送N2会话管理请求消息；其中，所述N2会话管理请求消息中可以携带N2会话管理信息(N2 SM Information)。
步骤712、AMF向第一UPF发送N4会话建立请求消息；第一UPF向AMF返回N4会话建立确认消息。
步骤713、SMF向AMF返回N2会话管理应答消息。
步骤714、可选地，若在步骤707中没有分配第一IP地址的话，SMF通过第一UPF向UE发送地址配置消息分配第一IP地址。如IPv6路由通告(Router Advertisement，简称RA)消息。
在本发明的具体实施例中，UE通过建立的第一PDU会话进行业务访问，并且可以同时访问多个目标应用。各个目标应用对应的AF可以直接与PCF进 行交互；也可以通过NEF与PCF进行交互，向PCF提供相关的业务信息用于PCF的策略决策。AF向PCF提供的各个目标应用对应的第一业务信息中可以携带第一IP地址、第一媒体描述组件以及第一次请求的带宽等信息；AF向PCF提供的各个目标应用对应的第二业务信息中可以携带第二IP地址、第二媒体描述组件以及第二次请求的带宽等信息。
步骤715、SMF满足预先设置的触发条件时，通过多PDU会话建立进行锚点UPF重选。
在本发明的具体实施例中，所述触发条件可以包括：SMF接收到任意一个目标应用发送的流量导向请求；或者，第一UPF的网络负荷超过预先设置的门限值；或者，SMF接收到第一UPF发送的用户面检测信息的上报。也就是说，任意一个第三方应用可能发现UE的位置以及第一UPF的位置已经不是访问该第三方应用的最佳路径，该第三方应用可以向SMF发送流量导向请求，SMF在接收到第三方应用发送的流量导向请求后，SMF可以决定重选UPF；或者，当第一UPF的网络负荷超过预先设置的门限值时，SMF可以决定重选UPF；或者，SMF接收用户面检测信息的上报，SMF可以决定重选UPF。
步骤716、SMF向UE发送NAS通知消息；其中，所述NAS通知消息中可以携带第一PDU会话标识和第一IP地址的有效期(即第一PDU会话将被保持的时间)。
在本步骤中，SMF通知UE第一PDU会话在一段时间后将被释放，同时通知UE请求建立一个到同一个DN的第二PDU会话。
步骤717、UE向AMF发起第二PDU会话的PDU会话建立请求消息；其中，所述PDU会话建立请求消息中可以携带第一PDU会话标识、第二PDU会话标识、请求类型、N1会话管理信息(SM Information)和数据网标识(Data Network Name，DN Name)。
步骤718、AMF根据第一PDU会话标识选择同一个SMF；AMF向所选择的SMF发送会话管理请求消息；其中，所述会话管理请求消息中可以携带用户标识；DN Name、第一PDU会话标识、第二PDU会话标识、用户位置信息、 SSC Mode以及N1会话管理信息(N1 SM Information)。
步骤719、SMF为第二PDU会话选择第二UPF作为新的锚点UPF，并为UE分配第二UPF对应的第二IP地址(可以是IPv4地址2或IPv6 prefix 2)。SMF向PCF发送第二PDU会话对应的第二策略请求消息；其中，所述第二策略请求消息中可以携带用户标识、DN Name、SSC Mode和第二IP地址。
在本步骤中，SMF在向PCF发送第二PDU会话对应的第二策略请求消息之前，SMF还可以与统一数据管理UDM交互，获取用户的签约信息，并对UE进行校验。
步骤720、PCF向SMF返回第二策略确认消息；其中，所述第二策略确认消息中可以携带默认策略。
步骤721、SMF向第二UPF发送N4会话建立请求消息；第二UPF向SMF返回N4会话建立确认消息；其中，所述N4会话建立请求消息中可以携带分组检测规则。
步骤722、SMF向AMF发送会话管理应答消息；其中，所述会话管理应答消息中可以携带N2会话管理信息(N2 SM Information)和N1会话管理信息(N1 SM Information)。
步骤723、AMF向基站发送N2 PDU会话请求消息；其中，所述N2 PDU会话请求消息中可以携带N2会话管理信息和NAS信息。
步骤724、基站向UE发送AN特定的信令；并向UE提供从SMF接收到的信息。
步骤725、基站向AMF发送N2 PDU会话应答消息；其中，所述N2 PDU会话应答消息中可以携带PDU会话标识以及N2会话管理信息(N2 SM Information)。
步骤726、AMF向SMF发送N2会话管理请求消息；其中，所述N2会话管理请求消息中可以携带N2会话管理信息(N2 SM Information)。
步骤727、AMF向第一UPF发送N4会话修改请求消息；第一UPF向AMF返回N4会话修改确认消息。
步骤728、SMF向AMF返回N2会话管理应答消息。
步骤729、可选地，若在步骤622中没有分配第二IP地址的话，SMF通过第二UPF向UE发送地址配置消息分配第二IP地址。如IPv6路由通告(Router Advertisement，简称RA)消息。
步骤730、PCF进行策略决策。
在本步骤中，PCF决定UE正在访问的，并且需要进行业务流迁移的各个目标应用；此外，PCF还需要考虑各个目标应用是否支持应用层重选。这些应用是在第一PDU会话建立后，通过AF与PCF交互，提供业务信息并请求对业务进行QoS保障的应用。
步骤731、PCF向目标应用对应的AF发送UPF重选请求消息；其中，所述UPF重选消息中至少可以携带第一IP地址的有效期和第二IP地址。可选地，所述UPF重选消息中还可以携带第二UPF的位置信息。
步骤732、在第一IP地址的有效期内，各个目标应用与UE进行交互，进行应用层的重选，UE采用新的第二IP地址进行访问，各个目标应用可能选择一个更靠近第二UPF的目标应用服务器继续提供访问，那么UE需要与各个目标应用服务器进行交互。
步骤733、各个目标应用对应的AF向PCF返回UPF重选确认消息；其中，所述UPF重选确认消息可以携带应用层重选后的第二业务信息。可选地，所述UPF重选确认消息还可以携带目标应用服务器的地址。
步骤734、PCF根据AF返回的确认信息更新策略决策，PCF根据AF提供的各个目标应用的第二业务信息制定策略。PCF与SMF交互，提供需要迁移的目标应用的策略规则，若AF提供了目标应用的目标应用服务器的地址，则在确认信息中还可以携带目标应用服务器的地址。
步骤735、SMF向第二UPF发送N4会话修改请求消息；第二UPF向SMF返回N4会话修改确认消息。
步骤736、可选地，SMF通过第二UPF向UE发送地址配置消息，如IPv6RA消息；其中，所述IPv6 RA消息中可以携带IPv6 prefix 2和路由选项信息； 其中，所述路由信息选项信息中携带可以目标应用服务器的地址。
在本发明的具体实施例中，针对每一PCF确定需要通知的应用，执行步骤731-步骤736。
本发明实施例提出的UPF重选的策略控制方法，PCF可以先从第一PDU会话发生锚点重选的事件通知，以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；然后PCF可以将第一IP地址的有效期和第二IP地址发送给各个目标应用对应的AF。也就是说，在本发明实施例的技术方案中，PCF可以将第一UPF对应的IP地址的有效期和第二UPF的IP地址通知给第一PDU会话对应的AF，以使各个目标应用可以在第一IP地址的有效期内前执行应用层的重选，即采用第二IP地址进行业务访问，各个目标应用可以选择一个更靠近第二UPF的应用服务器继续提供业务。而现有技术中，SMF只能针对其中一个目标应用进行UPF重选。因此，和现有技术相比，本发明实施例提出的UPF重选的策略控制方法，可以因为一个目标应用触发UPF重选后，通知UE正在访问的其他目标应用UPF重选的事件，以便其他目标应用在第一IP地址的有效期内进行应用层的重选，不会对UE正在访问的其他目标应用的使用体验产生影响；并且，本发明实施例的技术方案实现简单方便，便于普及，使用范围更广。
图8为本发明实施例中PCF的第一组成结构示意图。如图8所示，所述PCF包括：获取单元801和发送单元802；其中，
所述获取单元801，配置为从SMF获取第一PDU会话发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；
所述发送单元802，配置为将所述第一IP地址和有效期和所述第二IP地址发送给各个目标应用对应的AF。
进一步的，所述获取单元801，还配置为在所述第一PDU会话的建立过程中，从所述SMF获取所述第一IP地址。
图9为本发明实施例中PCF的第二组成结构示意图。如图9所示，所述PCF 还包括：策略规则制定单元803，配置为接收各个AF提供的各个目标应用对应的第一业务信息；根据各个目标应用对应的第一业务信息制定各个目标应用对应的第一策略规则；
所述发送单元802，还配置为将各个目标应用对应的策略规则提供给所述SMF。
进一步的，所述策略规则制定单元803，还配置为接收各个AF提供的各个目标应用对应的第二业务信息；根据各个目标应用对应的第二业务信息制定各个目标应用对应的第二策略规则；
所述发送单元802，还配置为将各个目标应用对应的第二策略规则提供给所述SMF。
进一步的，所述获取单元801，还配置为接收各个AF提供的各个目标应用对应的目标应用服务器的地址；
所述发送单元802，还配置为将各个目标应用对应的目标应用服务器的地址提供给所述SMF。
本发明实施例提出的PCF，PCF可以先从第一PDU会话发生锚点重选的事件通知，以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；然后PCF可以将第一IP地址的有效期和第二IP地址发送给各个目标应用对应的AF。也就是说，在本发明实施例的技术方案中，PCF可以将第一UPF对应的IP地址的有效期和第二UPF的IP地址通知给第一PDU会话对应的AF，以使各个目标应用可以在第一IP地址的有效期内前执行应用层的重选，即采用第二IP地址进行业务访问，各个目标应用可以选择一个更靠近第二UPF的应用服务器继续提供业务。而现有技术中，SMF只能针对其中一个目标应用进行UPF重选。因此，和现有技术相比，本发明实施例提出的PCF，可以因为一个目标应用触发UPF重选后，通知UE正在访问的其他目标应用UPF重选的事件，以便其他目标应用在第一IP地址的有效期内进行应用层的重选，不会对UE正在访问的其他目标应用的使用体验产生影响；并且，本发明实施例的技术方案实现简单方便，便于普及，使用范围更广。
图10为本发明实施例中SMF的第一组成结构示意图。如图10所示，所述SMF包括：锚点重选单元1001和通知单元1002；其中，
所述锚点重选单元1001，配置为当满足预先设置的触发条件时，对第一PDU会话执行锚点重选；
所述通知单元1002，配置为将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF。
图11为本发明实施例中SMF的第二组成结构示意图。如图11所示，所述SMF还包括：地址分配单元1003，配置为在所述第一PDU会话的建立过程中，为所述第一PDU会话选择所述第一UPF，分配所述第一IP地址；
所述通知单元1002，还配置为将所述第一IP地址通知所述PCF。
进一步的，所述触发条件至少包括以下其中之一：
接收到任意一个目标应用发送的流量导向请求；
或者，所述第一UPF的网络负荷超过预先设置的门限值；
或者，接收到所述第一UPF发送的用户面检测信息的上报。
进一步的，所述地址分配单元1003，还配置为将所述第一UPF会话更改为多归属Multi-Homing PDU会话；为所述Multi-Homing PDU会话选择所述第二UPF，并分配所述第二IP地址。
进一步的，所述通知单元1002，还配置为通知所述UE所述第一PDU会话在所述有效期后将被释放，以使所述UE请求建立一个第二PDU会话；其中，所述第一PDU会话与所述第二PDU会话对应的外部数据网络DN相同；
所述地址分配单元1003，还配置为接收所述UE发送的所述第二PDU会话的建立请求消息，为所述第二PDU会话选择所述第二UPF，并分配所述第二IP地址。
进一步的，所述SMF还包括：检测规则制定单元1004，配置为接收所述PCF制定的各个目标应用对应的第一策略规则；根据各个目标应用对应的第一策略规则制定各个目标应用对应的第一分组检测规则；
所述通知单元1002，还配置为将各个目标应用对应的第一分组检测规则提 供给所述第二UPF。
进一步的，所述检测规则制定单元1004，还配置为接收所述PCF制定的各个目标应用对应的第二策略规则；根据各个目标应用对应的第二策略规则制定各个目标应用对应的第二分组检测规则；
所述通知单元1002，还配置为将各个目标应用的对应的分组检测规则提供给所述第二UPF。
进一步的，所述锚点重选单元1001，还配置为接收所述PCF提供的各个目标应用对应的源应用服务器的地址；
所述通知单元1002，还配置为将各个目标应用对应的源应用服务器的地址提供给所述UE。
进一步的，所述锚点重选单元1001，还配置为接收所述PCF提供的各个目标应用对应的目标应用服务器的地址；
所述通知单元1002，还配置为将各个目标应用对应的目标应用服务器的地址提供给所述UE。
本发明实施例提出的SMF，当满足预先设置的触发条件时，SMF可以对第一PDU会话执行锚点重选；然后SMF可以将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF。也就是说，在本发明实施例的技术方案中，SMF可以将发生锚点重选的事件通知以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF，然后PCF可以将第一UPF对应的IP地址的有效期和第二UPF的IP地址通知给各个目标应用对应的AF，以使各个目标应用可以在第一IP地址的有效期内前执行应用层的重选，即采用第二IP地址进行业务访问，各个目标应用可以选择一个更靠近第二UPF的应用服务器继续提供业务。而现有技术中，SMF只能针对其中一个目标应用进行UPF重选。因此，和现有技术相比，本发明实施例提出的SMF，可以因为一个目标应用触发UPF重选后，通知UE正在访问的其他目标应用UPF重选的事件，以便其他目标应用在第一IP地址的有效期内进行应用层的重选，不会对UE正在访问的 其他目标应用的使用体验产生影响；并且，本发明实施例的技术方案实现简单方便，便于普及，使用范围更广。
在实际应用中，所述获取单元801、发送单元802和策略规则制定单元803可由位于PCF中的中央处理器(CPU)、微处理器(MPU)、数字信号处理器(DSP)、或现场可编程门阵列(FPGA)等实现；锚点重选单元1001、通知单元1002和地址分配单元1003可由位于SMF中的中央处理器(CPU)、微处理器(MPU)、数字信号处理器(DSP)、或现场可编程门阵列(FPGA)等实现。
本发明实施例还提供一种电子设备，所述电子设备能够实现PCF或SMF的功能；所述电子设备的硬件组成结构示意图，如图12所示，电子设备110包括：至少一个处理器111、存储器112和至少一个网络接口114。电子设备110中的各个组件通过总线系统115耦合在一起。可理解，总线系统115用于实现这些组件之间的连接通信。总线系统115除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图12中将各种总线都标为总线系统115。
可以理解，存储器112可以是易失性存储器或非易失性存储器，也可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是ROM、可编程只读存储器(PROM，Programmable Read-Only Memory)、可擦除可编程只读存储器(EPROM，Erasable Programmable Read-Only Memory)、电可擦除可编程只读存储器(EEPROM，Electrically Erasable Programmable Read-Only Memory)、磁性随机存取存储器(FRAM，ferromagnetic random access memory)、快闪存储器(Flash Memory)、磁表面存储器、光盘、或只读光盘(CD-ROM，Compact Disc Read-Only Memory)；磁表面存储器可以是磁盘存储器或磁带存储器。易失性存储器可以是随机存取存储器(RAM，Random Access Memory)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(SRAM，Static Random Access Memory)、同步静态随机存取存储器(SSRAM，Synchronous Static Random Access Memory)、动态随机存取存储器(DRAM，Dynamic Random Access Memory)、同步动态随机存取存 储器(SDRAM，Synchronous Dynamic Random Access Memory)、双倍数据速率同步动态随机存取存储器(DDRSDRAM，Double Data Rate Synchronous Dynamic Random Access Memory)、增强型同步动态随机存取存储器(ESDRAM，Enhanced Synchronous Dynamic Random Access Memory)、同步连接动态随机存取存储器(SLDRAM，SyncLink Dynamic Random Access Memory)、直接内存总线随机存取存储器(DRRAM，Direct Rambus Random Access Memory)。本发明实施例描述的存储器112旨在包括但不限于这些和任意其它适合类型的存储器。
本发明实施例中的存储器112用于存储各种类型的数据以支持电子设备110的操作。这些数据的示例包括：用于在电子设备110上操作的任何计算机程序，如应用程序1122。实现本发明实施例方法的程序可以包含在应用程序1122中。
上述本发明实施例揭示的方法可以应用于处理器111中，或者由处理器111实现。处理器111可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法的各步骤可以通过处理器111中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器111可以是通用处理器、数字信号处理器(DSP，Digital Signal Processor)，或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。处理器111可以实现或者执行本发明实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本发明实施例所公开的方法的步骤，可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于存储介质中，该存储介质位于存储器112，处理器111读取存储器112中的信息，结合其硬件完成前述方法的步骤。
在示例性实施例中，电子设备110可以被一个或多个应用专用集成电路(ASIC，Application Specific Integrated Circuit)、DSP、可编程逻辑器件(PLD，Programmable Logic Device)、复杂可编程逻辑器件(CPLD，Complex Programmable Logic Device)、FPGA、通用处理器、控制器、MCU、MPU、或 其他电子元件实现，用于执行前述方法。
本发明实施例还提供一种存储介质，存储有可执行程序，所述可执行程序被处理器执行时，实现前述的PCF执行的UPF重选的策略控制方法。
本发明实施例还提供另一种存储介质，存储有可执行程序，所述可执行程序被处理器执行时，实现前述的SMF执行的UPF重选的策略控制方法。
另外，在本实施例中的各个单元可以单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。
所述集成的单元如果以软件功能模块的形式实现并非作为独立的产品进行销售或使用时，可以存储在一个可读取存储介质中，基于这样的理解，本实施例的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该软件产品存储在一个存储介质中，包括若干指令用以使得一台主机(可以是个人移动终端，服务器，或者网络设备等)或processor(处理器)执行本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。
具体来讲，本实施例中UPF重选的策略控制方法对应的程序指令可以被存储在光盘，硬盘，U盘等存储介质上，当存储介质中的与UPF重选的策略控制方法对应的程序指令被一电子设备读取或被执行时，包括如下步骤：
从SMF获取第一PDU会话发生锚点重选的事件通知，以及第一UPF对应的用户设备UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；
将所述第一IP地址的有效期和所述第二IP地址发送给各个目标应用对应的AF。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用硬件实施例、软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算 机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。
工业实用性
本发明实施例中，当满足预先设置的触发条件时，SMF对第一PDU会话执行锚点重选；将发生锚点重选的事件通知、以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF；PCF从SMF获取第一PDU会话发生锚点重选的事件通知，以及获取第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址；将所述第一IP地址的有效期和所述第二IP地址发送给各个目标应用对应的AF。如此，可以 在一个目标应用触发UPF重选后，通知UE正在访问的其他目标应用UPF重选的事件，以便其他目标应用在第一IP地址的有效期内进行应用层的重选，不会对UE正在访问的其他目标应用的使用体验产生影响。

Claims (32)

  1. 一种用户面功能实体UPF重选的策略控制方法，所述方法包括：
    从会话管理功能实体SMF获取第一协议数据单元PDU会话发生锚点重选的事件通知，以及获取第一UPF对应的用户设备UE的第一网络协议IP地址的有效期和第二UPF对应的UE的第二IP地址；
    将所述第一IP地址的有效期和所述第二IP地址发送给各个目标应用对应的应用功能实体AF。
  2. 根据权利要求1所述的方法，其中，在所述从SMF获取所述第一PDU会话发生锚点重选的事件通知，以及获取第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址之前，所述方法还包括：
    在所述第一PDU会话的建立过程中，从所述SMF获取所述第一IP地址。
  3. 根据权利要求1所述的方法，其中，在所述从SMF获取第一PDU会话发生锚点重选的事件通知，以及获取第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址之前，所述方法还包括：
    接收各个AF提供的各个目标应用对应的第一业务信息；
    根据各个目标应用对应的第一业务信息制定各个目标应用对应的第一策略规则；
    将各个目标应用对应的策略规则提供给所述SMF。
  4. 根据权利要求3所述的方法，其中，在所述将所述第一IP地址的有效期和所述第二IP地址发送给各个目标应用对应的AF之后，所述方法还包括：
    接收各个AF提供的各个目标应用对应的第二业务信息；
    根据各个目标应用对应的第二业务信息制定各个目标应用对应的第二策略规则；
    将各个目标应用对应的第二策略规则提供给所述SMF。
  5. 根据权利要求1所述的方法，其中，在所述将所述第一IP地址的有 效期和所述第二IP地址发送给各个目标应用对应的AF之后，所述方法还包括：
    接收各个AF提供的各个目标应用对应的目标应用服务器的地址；
    将各个目标应用对应的目标应用服务器的地址提供给所述SMF。
  6. 一种用户面功能实体UPF重选的策略控制方法，所述方法包括：
    当满足预先设置的触发条件时，对第一协议数据单元PDU会话执行锚点重选；
    将发生锚点重选的事件通知、以及第一UPF对应的UE的第一网络协议IP地址的有效期和第二UPF对应的UE的第二IP地址通知给策略控制功能实体PCF。
  7. 根据权利要求6所述的方法，其中，在所述对第一PDU会话执行锚点重选之前，所述方法还包括：
    在所述第一PDU会话的建立过程中，为所述第一PDU会话选择所述第一UPF，分配所述第一IP地址；
    将所述第一IP地址通知给所述PCF。
  8. 根据权利要求6所述的方法，其中，所述触发条件至少包括以下其中之一：
    接收到任意一个目标应用发送的流量导向请求；
    或者，所述第一UPF的网络负荷超过预先设置的门限值；
    或者，接收到所述第一UPF发送的用户面检测信息的上报。
  9. 根据权利要求6所述的方法，其中，在所述对所述第一UPF执行锚点重选之后，所述方法还包括：
    将所述第一UPF会话更改为多归属Multi-Homing PDU会话；
    为所述Multi-Homing PDU会话选择所述第二UPF，并分配所述第二IP地址。
  10. 根据权利要求6所述的方法，其中，在所述对第一PDU会话执行锚点重选之后，所述方法还包括：
    通知所述UE所述第一PDU会话在所述有效期后将被释放，以使所述UE请求建立一个第二PDU会话；其中，所述第一PDU会话与所述第二PDU会话对应的外部数据网络DN相同；
    接收所述UE发送的所述第二PDU会话的建立请求消息，为所述第二PDU会话选择所述第二UPF，并分配所述第二IP地址。
  11. 根据权利要求6所述的方法，其中，在所述对第一PDU会话执行锚点重选之前，所述方法还包括：
    接收所述PCF制定的各个目标应用对应的第一策略规则；
    根据各个目标应用对应的第一策略规则制定各个目标应用对应的第一分组检测规则；
    将各个目标应用对应的第一分组检测规则提供给所述第二UPF。
  12. 根据权利要求11所述的方法，其中，在所述将发生锚点重选的事件通知、以及第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给所述PCF之后，所述方法还包括：
    接收所述PCF制定的各个目标应用对应的第二策略规则；
    根据各个目标应用对应的第二策略规则制定各个目标应用对应的第二分组检测规则；
    将各个目标应用的对应的分组检测规则提供给所述第二UPF。
  13. 根据权利要求6所述的方法，其中，在所述对第一PDU会话执行锚点重选之前，所述方法还包括：
    接收所述PCF提供的各个目标应用对应的源应用服务器的地址；
    将各个目标应用对应的源应用服务器的地址提供给所述UE。
  14. 根据权利要求6所述的方法，其中，在所述将发生锚点重选的事件通知、以及所述第一UPF对应的UE的第一IP地址的有效期和第二UPF对应的UE的第二IP地址通知给PCF之后，所述方法还包括：
    接收所述PCF提供的各个目标应用对应的目标应用服务器的地址；
    将各个目标应用对应的目标应用服务器的地址提供给所述UE。
  15. 一种策略控制功能实体PCF，所述PCF包括：获取单元和发送单元；其中，
    所述获取单元，配置为从会话管理功能实体SMF获取第一协议数据单元PDU会话发生锚点重选的事件通知，以及获取第一用户面功能实体UPF对应的用户设备UE的第一网络协议IP地址的有效期和第二UPF对应的UE的第二IP地址；
    将所述第一IP地址和有效期和所述第二IP地址发送给各个目标应用对应的应用功能实体AF。
  16. 根据权利要求15所述的PCF，其中，所述获取单元，还配置为在所述第一PDU会话的建立过程中，从所述SMF获取所述第一IP地址。
  17. 根据权利要求15所述的PCF，其中，所述PCF还包括：策略规则制定单元，配置为接收各个AF提供的各个目标应用对应的第一业务信息；根据各个目标应用对应的第一业务信息制定各个目标应用对应的第一策略规则；
    所述发送单元，还配置为将各个目标应用对应的策略规则提供给所述SMF。
  18. 根据权利要求17所述的PCF，其中，所述策略规则制定单元，还配置为接收各个AF提供的各个目标应用对应的第二业务信息；根据各个目标应用对应的第二业务信息制定各个目标应用对应的第二策略规则；
    所述发送单元，还配置为将各个目标应用对应的第二策略规则提供给所述SMF。
  19. 根据权利要求15所述的PCF，其中，所述获取单元，还配置为接收各个AF提供的各个目标应用对应的目标应用服务器的地址；
    所述发送单元，还配置为将各个目标应用对应的目标应用服务器的地址提供给所述SMF。
  20. 一种会话管理功能实体SMF，所述SMF包括：锚点重选单元和通知单元；其中，
    所述锚点重选单元，配置为当满足预先设置的触发条件时，对第一协议数据单元PDU会话执行锚点重选；
    所述通知单元，配置为将发生锚点重选的事件通知、以及第一用户面功能实体UPF对应的用户设备UE的第一网络协议IP地址的有效期和第二UPF对应的UE的第二IP地址通知给策略控制功能实体PCF。
  21. 根据权利要求20所述的SMF，其中，所述SMF还包括：地址分配单元，配置为在所述第一PDU会话的建立过程中，为所述第一PDU会话选择所述第一UPF，分配所述第一IP地址；
    所述通知单元，还配置为将所述第一IP地址通知所述PCF。
  22. 根据权利要求20所述的SMF，其中，所述触发条件至少包括以下其中之一：
    接收到任意一个目标应用发送的流量导向请求；
    或者，所述第一UPF的网络负荷超过预先设置的门限值；
    或者，接收到所述第一UPF发送的用户面检测信息的上报。
  23. 根据权利要求20所述的SMF，其中，所述地址分配单元，还配置为将所述第一UPF会话更改为多归属Multi-Homing PDU会话；为所述Multi-Homing PDU会话选择所述第二UPF，并分配所述第二IP地址。
  24. 根据权利要求20所述的SMF，其中，所述通知单元，还配置为通知所述UE所述第一PDU会话在所述有效期后将被释放，以使所述UE请求建立一个第二PDU会话；其中，所述第一PDU会话与所述第二PDU会话对应的外部数据网络DN相同；
    所述地址分配单元，还配置为接收所述UE发送的所述第二PDU会话的建立请求消息，为所述第二PDU会话选择所述第二UPF，并分配所述第二IP地址。
  25. 根据权利要求20所述的SMF，其中，所述SMF还包括：检测规则制定单元，配置为接收所述PCF制定的各个目标应用对应的第一策略规则；根据各个目标应用对应的第一策略规则制定各个目标应用对应的第一分组检 测规则；
    所述通知单元，还配置为将各个目标应用对应的第一分组检测规则提供给所述第二UPF。
  26. 根据权利要求25所述的SMF，其中，所述检测规则制定单元，还配置为接收所述PCF制定的各个目标应用对应的第二策略规则；根据各个目标应用对应的第二策略规则制定各个目标应用对应的第二分组检测规则；
    所述通知单元，还配置为将各个目标应用的对应的分组检测规则提供给所述第二UPF。
  27. 根据权利要求20所述的SMF，其中，所述锚点重选单元，还配置为接收所述PCF提供的各个目标应用对应的源应用服务器的地址；
    所述通知单元，还配置为将各个目标应用对应的源应用服务器的地址提供给所述UE。
  28. 根据权利要求20所述的SMF，其中，所述锚点重选单元，还配置为接收所述PCF提供的各个目标应用对应的目标应用服务器的地址；
    所述通知单元，还配置为将各个目标应用对应的目标应用服务器的地址提供给所述UE。
  29. 一种策略控制功能实体PCF，包括：处理器以及存储有所述处理器可执行指令的存储器，当所述指令被处理器执行时，执行权利要求1至5任一项所述的用户面功能实体UPF重选的策略控制方法。
  30. 一种会话管理功能实体SMF，包括：处理器以及存储有所述处理器可执行指令的存储器，当所述指令被处理器执行时，执行权利要求6至14任一项所述的UPF重选的策略控制方法。
  31. 一种存储介质，所述存储介质中存储有计算机可执行指令，该计算机可执行指令用于执行权利要求1至6任一项所述的用户面功能实体UPF重选的策略控制方法。
  32. 一种存储介质，所述存储介质中存储有计算机可执行指令，该计算机可执行指令用于执行权利要求6至14任一项所述的用户面功能实体UPF重选 的策略控制方法。
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