Patent ID: 8224327

Claim:
A method for a handoff of a mobile node using a client mobile Internet Protocol (IP) at a Target Packet Data Service Node (T-PDSN) in a mobile communication system supporting a Proxy Mobile IP (PMIP), the method comprising the steps of: if the mobile node moves to an area of the T-PDSN, transmitting, to a Serving Packet Data Service Node (S-PDSN), a HandOff request (HO_request) message for the handoff of the mobile node; receiving a context of the mobile node from the S-PDSN; transmitting a first binding update message to a Home Agent (HA) of the mobile node; performing registration for the handoff of the mobile node; and filtering a second binding update message according to the client mobile IP and informing the mobile node of an incapability of processing the second binding update message, when the second binding update message is received from the mobile node during a wait for a response to the first binding update message from the HA.