Patent ID: 6745030
Filing Date: 2004-06-01
Classification: H04L,H04Q,H04W

Abstract:
A mobile communication system comprising:network identification information obtaining means belonging to a first network for obtaining, when a mobile terminal not registered at said first network enters said first network as a visitor terminal, identification information that identifies a second network at which said mobile terminal is registered; authentication information requesting means for requesting, based on said identification information obtained, the second network to send authentication information necessary for the visitor terminal to communicate in the first network; authentication information storing means for storing, when the authentication information is received from the second network, said authentication information in any one of a plurality of exchanges belonging to the first network; call information storing means for storing call information generated when the visitor terminal starts communication in the first network; exchange storing means for storing information representative of the exchanges each storing the authentication information and call information of a particular visitor terminal; and searching means for searching, when any one of the exchanges needs for hand-over the authentication information and call information of the visitor terminal that moves while in communication, contents of said exchange storing means to thereby locate the exchange storing said authentication information and said call information and provide said one exchange with said authentication information and said call information.