ALWAYS-ON SERVICE METHOD USING AN APN IN A W-CDMA NETWORK, ESPECIALLY IN CONNECTION WITH DETERMINING TO MAINTAIN OR CANCEL A PDP CONTEXT BY USING THE APN

摘要

PURPOSE: An always-on service method using an APN in a W-CDMA network is provided to determine to maintain or cancel a PDP context by using an APN, thereby supplying a differentiated always-on service while saving network resources. CONSTITUTION: An SGSN identifies whether an Iu disconnection or an RAB disconnection request message is transmitted(S410). If so, the SGSN receives the request message(S420), and inquires about a traffic class(S430). The SGSN identifies whether the traffic class refers to a bidirectional or background service, or a call or streaming service(S440). If the traffic class refers to the bidirectional or background service, the SGSN identifies whether an APN is in always-on state(S450). If so, the SGSN maintains a PDP context(S460). If the APN is not in the always-on state, the SGSN inactivates the PDP context(S470).