System and method for establishing session of mobile terminal in a mobile ip system

The present invention in a wireless communication system for providing a Mobile IPv6 to a system and method for maintaining the information of the mobile terminal. In the present invention, it provides a continuity of changing the access router of the mobile terminal in a mobile IP network, service, and provides a system and method which can reduce the time overhead of the system that is to be the access router changes. In such the method of the invention, authentication / authorization of a system having a home network and a visitor network for providing a mobile IPv6 to a mobile terminal and the mobile terminal using mobile IPv6 / accounting server to establish a session with the mobile station a method of, examining by the authentication / authorization / accounting server whether the information of the mobile node stored in the cache entry upon being said server is an authentication / authorization request of a mobile terminal that can not be authenticated (ARR) message received perform the process, and determined that the authentication / authorization of the mobile terminal if it is the information of the mobile node stored in the cache entry, and includes the process of transferring it to generate a message for transmission to the mobile terminal.