Patent ID: 7356002

Claim:
A method, in a network comprising a mobile node and a router linked to the mobile node, wherein communication is performed using a current care of address (CoA), and a plurality of routers geographically adjacent to the router, for reserving a new CoA in advance for the mobile node under a mobile environment, said method comprising: transmitting to the router a CoA reservation solicitation message including a link layer address of the mobile node, from the mobile node; transmitting to a first adjacent router of the plurality of adjacent routers the CoA reservation solicitation message including the current CoA and the link layer address of the mobile node, from the router; generating a new CoA by the first adjacent router and performing a duplicate address check on the new CoA to confirm the new CoA; storing the established new CoA in a proxy table that is managed by the first adjacent router to perform a proxy; if the mobile node is newly linked to the first adjacent router of the plurality of adjacent routers, transmitting a reserved CoA request message to the newly linked first adjacent router; retrieving the new CoA in a proxy table that is managed by the newly linked first adjacent router; removing the retrieved new CoA from the proxy table to suspend the proxy performance; transmitting the retrieved new CoA to the mobile node; and allowing the mobile node to communicate using the transmitted new CoA.