Patent ID: 7519367

Claim:
A handover control apparatus for controlling handover of a radio terminal unit between edge routers provided in respective base stations for radio communication with a radio terminal unit and to which routers are connected above in a hierarchical structure, said handover control apparatus comprising: a controller configured to specify a relay router from a plurality of Cross Over Routers (CORs) where all paths from an edge router before movement of the radio terminal unit and from every edge router as a candidate for a destination of the movement to a communication correspondent intersect, wherein each of said edge routers are configured to store information about edge routers mounted in base stations forming radio zones adjacent to a radio zone of a base station in which the edge router before movement of the radio terminal is mounted, and information about superordinate routers to which the adjacent edge routers and the edge router before movement of the radio terminal are connected, and said controller is configured to specify the relay router from the plurality of CORs on the basis of the stored information.