Resource revoking method based on resource admission control subsystem and network device

1. A resource revoking method based on a resource admission control subsystem, comprising:

when a service-based policy decision function selects a border gateway function to allocate service resources according to a policy, recording corresponding information including border gateway function information in a context related to resources at an access-resource and admission control function;

receiving, by a service-based policy decision function, a Revoke Reservation notification containing the context including the border gateway function information related to resources from the access-resource and admission control function,

parsing the context in the Revoke Reservation notification;

determining, by the service-based policy decision function, whether service resources have been allocated by a border gateway function for a session in accordance with the context parsed from the Revoke Reservation notification; and

if determining that the service resources have been allocated by the border gateway function for the session in accordance with the context including border gateway function information, notifying, by the service-based policy decision function, the border gateway function to release and revoke the service resources allocated for the session;

if determining that the service resources have not been allocated by the border gateway function for the session in accordance with the context including border gateway function information, terminating, by the service-based policy decision function, the processing flow of resource revoking.

2. The method according to claim 1 , further comprising the step of: receiving by the service-based policy decision function an execution result returned from the border gateway function to the service-based policy decision function.

3. The method according to claim 1 , further comprising: checking, by the access-resource and admission control function, whether it is necessary to revoke a policy installed for a resource control enforcement function, and notifying the resource control enforcement function to revoke the policy if it is necessary; and returning the execution result from the resource control enforcement function to the access-resource and admission control function.

4. The method according to claim 1 , before the service-based policy decision function receives the Revoke Reservation notification, further comprising:

triggering an event associated with Revoke Reservation by a network attachment subsystem or a resource control enforcement function.

5. The method according to claim 1 , after the service-based policy decision function receives the Revoke Reservation notification, further comprising: notifying an application function to revoke resource reservation by the service-based policy decision function.

6. A resource revoking method based on resource admission control subsystem, comprising:

receiving by a service-based policy decision function a Revoke Reservation notification from an access-resource and admission control function;

after receiving the Revoke Reservation notification from the access-resource and admission control function, determining, by the service-based policy decision function, whether service resources have been allocated by a border gateway function for a session by searching for identification information of the border gateway function that is recorded in the service-based policy decision function and that is created when an application function requests for resources and the service-based policy decision function select the border gateway function to allocate resources; and

if determining that the service resources have been allocated by the border gateway function for the session, notifying, by the service-based policy decision function, the border gateway function to release and revoke the service resources allocated for the session;

if determining that the service resources have not been allocated by the border gateway function for the session, terminating, by the service-based policy decision function, the processing flow of resource revoking.

7. The method according to claim 6 , further comprising the step of:

receiving by the service-based policy decision function the execution result returned from the border gateway function.

8. The method according to claim 6 , further comprising: checking, by the access-resource and admission control function, whether it is necessary to revoke a policy installed for a resource control enforcement function, and notifying the resource control enforcement function to revoke the policy if it is necessary; and returning the execution result from the resource control enforcement function to the access-resource and admission control function.

9. The method according to claim 6 , before the service-based policy decision function receives the Revoke Reservation notification, further comprising: triggering an event associated with Revoke Reservation by a network attachment subsystem or a resource control enforcement function.

10. The method according to claims 6 , after the service-based policy decision function receives the Revoke Reservation notification, further comprising: notifying the application function to revoke resource reservation by the service-based policy decision function.