DATA COMMUNICATION METHOD AND DATA COMMUNICATION EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To shorten interruption time of communication by switching connection from a sub-network being connected to a sub-network at a mobile destination after acquiring each IP address to be used by the sub-networks being connected and at the moving destination. SOLUTION: A fact that the sub-networks are soon switched is detected by an exit sensor 123 of the sub-network 110 by a mobile terminal 102. And an address reservation message is broadcasted by the mobile terminal 102. A fact that the received message is the address reservation message is recognized, the IP address for the sub-network 111 is selected from an IP address resource 106 and is allocated to the mobile terminal 102 by an address allocating device 105. After that, the acquired IP address for the sub-network 111 is set to a network interface by the mobile terminal 102 by which move to the sub- network 111 is detected. An ATM updata request message is transmitted to a repeater 103 by the mobile terminal 102.