Patent ID: 8218498

Claim:
A method to transmit a mobile IP packet, the method comprising: storing a first packet not transmitted to a mobile terminal in a first radio access station in response to receiving a handover indication message while the mobile terminal moves from the first radio access station to a second radio access station; removing, by a first access control router coupled to the first radio access station, an IP tunnel directed to the mobile terminal in response to receiving the handover indication message; storing a second packet directed to the mobile terminal in the first access control router; processing a link-layer handover procedure between the first radio station and the second radio station; creating a first tunnel between the first radio access station and the second radio access station after the link-layer handover procedure is completed; and transmitting the first packet stored in the first radio access station to the second radio access station via the first tunnel; creating a second tunnel between the first access control router and the second radio access station after the first packet stored in the first radio access station is transmitted; and transmitting the second packet stored in the first access control router to the second radio access station via the second tunnel.