Session processing method, apparatus, and system

1. A session processing method, comprising:

receiving, by a policy control function apparatus from an application function apparatus, a request, wherein the request comprises a continuity requirement of an application indicating whether an internet protocol (IP) address used by a user equipment to access a server of the application remains unchanged;

determining, based on the continuity requirement, that the IP address used by the user equipment to access the server of the application remains unchanged;

in response to determining that the IP address remains unchanged, determining, by the policy control function apparatus, policy information indicating that an anchor user plane function network element for accessing the server of the application remains unchanged;

sending, by the policy control function apparatus, the policy information to a session management function apparatus;

receiving, by the session management function apparatus, the policy information from the policy control function apparatus; and

processing, by the session management function apparatus, a session according to the policy information.

2. The method according to claim 1 , wherein sending the policy information to the session management function apparatus comprises:

sending, by the policy control function apparatus, a policy control and charging (PCC) rule to the session management function apparatus, wherein the policy information is included in the PCC rule.

3. The method according to claim 1 , further comprising:

determining, by the application function apparatus, the continuity requirement of the application; and

sending, by the application function apparatus, the request to the policy control function apparatus.

4. The method according to claim 1 , wherein the request further comprises indication information indicating that the server of the application does not support context migration with another application server.

5. A system, comprising a policy control function apparatus and a session management function apparatus, wherein:

the policy control function apparatus is configured to:

receive from an application function apparatus, a request, wherein the request comprises a continuity requirement of an application indicating whether an internet protocol (IP) address used by a user equipment to access a server of the application remains unchanged;

determine, based on the continuity requirement, that the IP address used by the user equipment to access the server of the application remains unchanged;

in response to determining that the IP address remains unchanged, determine policy information indicating that an anchor user plane function network element for accessing the server of the application remains unchanged; and

send the policy information to the session management function apparatus; and

the session management function apparatus is configured to receive the policy information from the policy control function apparatus; and process a session according to the policy information.

6. The system according to claim 5 , wherein the policy control function apparatus is configured to send a policy control and charging (PCC) rule to the session management function apparatus, wherein the policy information is included in the PCC rule.

7. The system according to claim 5 , further comprising the application function apparatus, wherein:

the application function apparatus is configured to determine the continuity requirement of the application; and

send the request to the policy control function apparatus.

8. The system according to claim 5 , wherein the request further comprises indication information indicating that the server of the application does not support context migration with another application server.

9. A session processing method, comprising:

receiving, by a policy control function apparatus from an application function apparatus, a request, wherein the request comprises a continuity requirement of an application indicating whether an internet protocol (IP) address used by a user equipment to access a server of the application remains unchanged;

determining, based on the continuity requirement, that the IP address used by the user equipment to access the server of the application remains unchanged;

in response to determining that the IP address remains unchanged, determining, by the policy control function apparatus, policy information indicating that an anchor user plane function network element for accessing the server of the application remains unchanged; and

sending, by the policy control function apparatus, the policy information to a session management function apparatus for session processing.

10. The method according to claim 9 , wherein the sending the policy information to the session management function apparatus comprises:

sending, by the policy control function apparatus, a policy control and charging (PCC) rule to the session management function apparatus, wherein the policy information is included in the PCC rule.

11. The method according to claim 9 , wherein the request further comprises indication information indicating that the server of the application does not support context migration with another application server.

12. An apparatus, comprising:

at least one processor; and

one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one processor to perform operations comprising:

receiving, a request from an application function apparatus, wherein the request comprises a continuity requirement of an application indicating whether an internet protocol (IP) address used by a user equipment to access a server of the application remains unchanged;

determining, based on the continuity requirement, that the IP address used by the user equipment to access the server of the application remains unchanged;

in response to determining that the IP address remains unchanged, determining policy information indicating that an anchor user plane function network element for accessing the server of the application remains unchanged; and

sending the policy information to a session management function apparatus for session processing.

13. The apparatus according to claim 12 , wherein the operations further comprising:

sending a policy control and charging (PCC) rule to the session management function apparatus, wherein the policy information is included in the PCC rule.

14. The apparatus according to claim 12 , wherein the request further comprises indication information indicating that the server of the application does not support context migration with another application server.