METHOD FOR CONTROLLING QUALITY OF SERVICE IN A COMMUNICATION SYSTEM BY USING POLICY DECISION FUNCTION MODULE

摘要

This invention provides a method for controlling quality of service in a communication system by using a policy decision function (PDF) module, which method comprises: sending by user equipment (UE) a service request message to an application function (AF) module; generating an authorization token (AT) by the application function module, and sending an authentication authorization request message carrying the AT to a PDF via a Gq interface; storing the AT at the PDF and returning via the Gq interface an authentication authorization answer message carrying the AT to the AF; sending by the UE an IP packet message to a gateway GPRS supporting node (GGSN); generating by the GGSN an AT identical to the above-mentioned AT; sending via a Go interface a request message carrying said AT to the PDF; comparing by the PDF the two ATs received, if they are the same, notifying the GGSN said user's success of authentication for using the quality of service required by the service. This invention can still achieve QoS control provided by PDF even without a secondary PDP context.