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

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.