Patent ID: 8089873

Claim:
A method for managing QoS-guaranteed multimode fast mobility in an Open Mobility Management Server (OMS), the method being capable of efficiently supporting Internet Protocol (IP)-based real-time multimedia services in wireless networks regardless of types of wireless networks when a mobile equipped with a multimode communication interface including a plurality of wireless communication interfaces moves between cells of the wireless networks, the method comprising the steps of: (a) when a request for call establishment with a specific counterpart host is made by the mobile host, registering and storing a user ID, a unique IP address of a user, a currently used temporary IP address and a current location of the mobile host, provided by the mobile host, in a mobility management information table; (b) completing the call establishment between the mobile host and the counterpart host; (c) after the call establishment between the mobile host and the counterpart host has been completed, establishing a tunnel between the OMS and the mobile host using a unique IP address of the OMS and a temporary IP address of the mobile host, and then transmitting data via the tunnel; (d) when a new temporary IP address and wireless network information of a newly activated wireless communication interface are provided by the mobile host, establishing a new tunnel between the OMS and the mobile host using the unique IP address of the OMS and the new temporary IP address of the mobile host, and then transmitting and receiving data packets via the existing tunnel and the new tunnel in parallel; and (e) when a request for removal of one from currently activated tunnels is made by the mobile host, removing the corresponding tunnel.