Method for handover using multi-cast in mobile network system

The present invention relates to a handover method using the multicast tree in a mobile network system, this invention is a multicast router connected to a plurality of access routers and the access router serving the mobile node and the mobile node, the mobile network communication system comprising, for a handover supporting method of the mobile node, a plurality of access routers serving access router, and at least one or more adjacent geographically with the serving access router to provide the current service to the mobile node When the neighbor access routers and the neighbor access of a router according to the handover of the mobile node includes a subsequent target access router providing the service, a handover of the mobile node requests, the mobile from the multicast router node of multi See the host address will be the process of configuring the multicast trees and, by using the multicast tree for the data traffic to the mobile node, it characterized in that it comprises the step of transmitting to the multicast mode. Mobile network (Mobile Network), multicast, unicast, handover (Handover), neighbor table, a multicast router (MR), the access router (AR)