Method, system, and entity for exercising policy control

A method for exercising policy control over an application service flow of a user equipment performed by a policy enforcement function entity, comprising:

• receiving an application event subscription message from a policy control function entity to subscribe an event of an application service, wherein the application event subscription message comprises an identifier of the application service and the event of the application service;
• detecting an application event according to the application event subscription message when the application service flow is transmitted via the policy enforcement function entity;
• acquiring information about the application event, wherein the information about the application event comprises the identifier of the application service and the event of the application service, the application event including starting or stopping of the application service;
• and
• sending the information about the application event to the policy control function entity.

A system for exercising policy control over an application service flow of a user equipment comprising:

• a policy control function entity, and
• a policy enforcement function entity;
• wherein the policy control function entity is configured to:
• send an application event subscription message to the policy enforcement function entity to subscribe an event of an application service, wherein the application event subscription message comprises an identifier of the application service and the event of the application service;
• receive a notification message from the policy enforcement function entity, wherein the notification message comprises the identifier of the application service and the event of the application service of the user equipment detected by the policy enforcement function entity, the event of the application service including starting or stopping of the application service;
• generate a control policy of the application service flow according to the event of the application service detected by the policy enforcement function entity;
• and
• deliver the control policy to the policy enforcement function entity for exercising policy control over the application service flow transmitted via the policy enforcement function entity;
• and
• wherein the policy enforcement function entity is configured to:
• receive an application event subscription message from the policy control function entity to subscribe the event of the application service;
• detect the application event according to the application event subscription message when the application service flow is transmitted via the policy enforcement function entity;
• acquire information about the application event, wherein the information about the application event comprises the identifier of the application service and the event of the application service, the application event including starting or stopping of the application service;
• and
• send the information about the application event to the policy control function entity.