Patent ID: 7751819

Claim:
A mobile communication system comprising: a packet transfer network configured to be accessed by a mobile node, the packet transfer network including an anchor router connected to at least a first access router and a second access router, wherein the second access router does not support a protocol associated with a first handover control system supported by the first access router; and a handover control unit through which traffic packets are not routed provided separately from the packet transfer network and configured to instruct of a handover from the first access router to the second access router in to the packet transfer network, wherein the handover control unit is configured to: select the first handover control system from a plurality of handover control systems for switching from the first access router to the second access router in accordance with a service quality corresponding to the mobile node, determine types of a primitive message different from the protocol associated with the first handover control system and common to the first and second access routers that indicates a process executable at the first and second access routers and the anchor router, destinations of the primitive message, and transmission timing of the primitive message in accordance with the first handover control system, and instruct of the handover by transmitting the primitive message to the first and second access routers and the anchor router included in the packet transfer network in accordance with the determined types, the determined destinations and the determined transmission timing.