Patent ID: 7899458

Claim:
A system for controlling handover, said system comprising: a mobile terminal which enables communication with a plurality of wireless systems having wireless access stations; and a handover-controlling apparatus which executes control of handover for said mobile terminal which travels among a plurality of types of the wireless systems; said mobile terminal including: a destination wireless system determining unit which receives downlink signals from two or more of the wireless access stations to determine which of the plurality of corresponding wireless systems accommodates a destination wireless access station based on reception quality of the downlink signals; a destination wireless system reporting unit which sends information indicating said determined wireless system to said handover-controlling apparatus; a travelling speed projecting unit which projects a travelling speed of the mobile terminal based on received power characteristics of the downlink signals from the two or more wireless access stations; a travelling speed reporting unit which sends information indicating said projected travelling speed of the mobile terminal to said handover-controlling apparatus, and said handover-controlling apparatus controls handover operations for said mobile terminal based on the information indicating the determined wireless system which is sent from said destination wireless system reporting unit; wherein said handover-controlling apparatus is connected to the two or more wireless access stations via a plurality of connecting access routers; said handover-controlling apparatus including: a database which manages corresponding relationships between said wireless access stations and said access routers; and a router compatibility determination unit which makes a determination by referring to said database, at a time the information indicating the wireless system which accommodates said destination wireless access station is reported, as to whether the access router which is connected to the destination wireless access station differs from the access router which is connected to a currently connecting wireless access station.