Network connection recovery method, AAA server, and radio access network gateway device

摘要

A network connection restoration method of an IP communications system having a radio access network and using Mobile IP for managing the movement of a mobile terminal is disclosed. The network connection restoration method includes the steps of (a) an AAA server selecting a first one of multiple home agents to which one the mobile terminal is to be connected at the time of authenticating the mobile terminal, (b) the AAA server detecting a failure of the selected first one of the home agents by communicating with the selected first one of the home agents, and (c) the AAA server selecting a second one of the home agents in response to step (b) detecting the failure of the selected first one of the home agents. The foreign agent of an ASN-GW monitors a home agent, and notifies the PMIP (Proxy Mobile IP) client of the ASN-GW of the monitoring result. The PMIP client reacquires a home agent through an AAA server, and reestablishes a foreign agent-home agent tunnel.