Abstract: A resource admission control subsystem based resource revoking method is provided. The method includes: receiving by a service-based policy decision function a Revoke Reservation notification; and when determining service resources have been allocated by 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. A network device is also provided. The network device includes: a processing unit for receiving a Revoke Reservation indication; a determining unit for determining whether it is necessary to request a border gateway function to release and revoke service resources in accordance with the Revoke Reservation indication from the processing unit; and a second notifying unit for notifying the border gateway function when the determining unit determines to request the border gateway function to release and revoke the service resources.

Abstract: An operation indication method is provided, which includes the following steps. After receiving a trigger message, an application function (AF) entity determines an operation indication, in which the operation indication includes indicating a quality of service (QoS) resource reservation operation and/or a network address translation (NAT) control operation; the AF entity sends the operation indication to a service-based policy decision function (SPDF) entity; and the SPDF entity receives and identifies the operation indication and performs a corresponding operation according to the operation indication.

Abstract: A method of realizing network address translation (NAT) includes the following steps. An application function (AF) entity receives a message, and determines a signaling direction according to the message. The AF entity carries the signaling direction information in an access authorization request (AAR) message and sends the AAR message to a service-based policy decision function (SPDF) entity. The SPDF entity obtains a corresponding local domain address according to the signaling direction, and sends the obtained address to the AF entity. The AF entity sends the message according to the local domain address. An entity and a system of realizing NAT are also provided.

Abstract: A resource admission control subsystem based resource revoking method is provided. The method includes: receiving by a service-based policy decision function a Revoke Reservation notification; and when determining service resources have been allocated by 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. A network device is also provided. The network device includes: a processing unit for receiving a Revoke Reservation indication; a determining unit for determining whether it is necessary to request a border gateway function to release and revoke service resources in accordance with the Revoke Reservation indication from the processing unit; and a second notifying unit for notifying the border gateway function when the determining unit determines to request the border gateway function to release and revoke the service resources.