Method for supplying a multicast service according to a handoff of a source node in a mobile internet protocol communication system

A number of mobile Internet protocol for a mobile communication terminal is the source node providing the multicast service to the receivers including the first access router and said first access router is different from the second access router that is performing the current communication (IP: in Internet Protocol) communication system, the mobile communication terminal a request for information for fast handoff to the first AR; It said first access router is notified of the multicast service availability of the second access router corresponding to the fast handoff information request to the mobile communication terminal; The mobile communication terminal and the second access router of the multicast service provider after being notified of the availability of the first access multicast service data and the second access router to the router notified the occurring after the transmission haeyaham; The first AR is notified of the handoff initiation of the MN receives the notification that the second AR transmission haeyaham the multicast service data for a subsequent to the second access router, and; The second access router after receiving notification indicating the start of a handoff response to the handoff initiation notification to the first access router, and; It said first access router provides the mobile communication terminal by the first access router and the second receiver to the multicast service notification to hand hayeoteum off to the AR in with the receiver receives notice of a response to the start handoff and controls to construct a new tree to receive. Multicast Service, Tree, fast handoff, the source node, the multicast IP address