Patent ID: 6980802

Claim:
A handover method in an mobile communication system that includes a mobile node (MN) having a mobile IP (Internet Protocol) address, a first foreign agent (FA) for wirelessly communicating with the MN in the area where the MN is located, a home agent (HA) for registering the location of the MN, a router connected to the HA, and a corresponding node (CN) connected to the router for communicating with the MN for performing IP tunneling with the first FA, the router transmitting IP tunneling information to the first FA through the HA, the method comprising the steps of: transmitting a Binding Update message including the IP address of a second FA and an acknowledgement request to the first FA by the second FA, when a handover occurs as the MN moves from the area of the first FA to the area of the second FA adjacent to the first FA; and transmitting a Binding Acknowledge message including a information of the IP tunneling capability of the router to the second FA in response to the Binding Update message by the first FA.