| 摘要 |
<p>A mobile communication system for managing a session and a method thereof are provided to minimize a waste of radio resources by deleting the session of an MS(Mobile Station) which has never generated any traffic during more than a certain timer value. An MS transmits an active PDP(Packet Data Protocol) context request message to an SGSN(Serving GPRS Support Node) in attempting a call(S200). In response to the message, the SGSN transmits a create PDP context request message to a GGSN(Gateway GPRS Support Node)(S201). The GGSN transmits an access request message for subscriber authentication to an AAA server(S202). In case subscriber authentication is successful, the AAA server transmits an access accept message, including a subscriber profile containing an idle-timeout value, to the GGSN(S203). The GGSN transmits a create PDP context response(request accepted) message to the SGSN(S204). The SGSN transmits an active PDP context accept message to the MS(S205). The GGSN sets the acct-status-type field of an accounting request message to "start" and transmits it to the AAA server(S206). The AAA server, receiving the accounting request message, recognizes the start of accounting and transmits an accounting response message to the GGSN(S207). The GGSN continuously monitors the session of the MS, and confirms whether the MS is in idle mode(S209). If the MS is in idle mode, the GGSN compares the idle time of the MS with the idle-timeout value received from the AAA server(S210). In case that the idle time is larger than the idle-timeout value, the GGSN transmits a delete PDP context message to the SGSN in order to conclude the session of the MS(S211).</p> |
