Method and system for seamless handover to a portable internet network by keeping the same IP address

摘要

Disclosed is a method for registering an IP address in a Portable Internet network in interworking with a different type of network, which enables a communication service to be continued without change in an IP address of a personal subscriber station when the personal subscriber station moves to the Portable Internet network, the method including: (a) when the personal subscriber station accesses the Portable Internet network, receiving a registration request message from the personal subscriber station, the registration request message including both information on an IP assignment method by which an IP address has been assigned to the personal subscriber station in the different type of network, and information on an IP address assigned to the personal subscriber station; and (b) registering the IP address being used by the different type of network as the IP address of the personal subscriber station by using the IP address information.