SESSION MANAGEMENT METHOD DURING PRESERVATION MODE IN MOBILE COMMUNICATION SYSTEM

摘要

PURPOSE: A session management method of a preservation mode in a mobile communication system is provided to obtain effect similar to addition of a PCRF materially the by not managing a session about a mobile communication terminal of the preservation mode in the PCRF. CONSTITUTION: An SGSN(Serving GPRS Support Node)(140) includes a Preservation mode notice signal within a PDP context update request signal. A GGSN(Gateway GPRS Support Node)(150) includes a Preservation mode creation signal within a PDP context update request notice signal. If an IMS (IP Multimedia Subsystem) call does not exist within a session, a PCRF(Policy and Charging Rules Function)(160-1) transmits a charging information delete command to the GGSN.