Patent ID: 8401540

Claim:
A mobile communication system comprising: a plurality of base stations which individually form radio zones; a mobile terminal configured to perform handoff as the mobile terminal moves among the radio zones; and a control device configured to communicate with both the base stations and the mobile terminal, wherein the mobile terminal comprises: a report unit configured to report a reception power of a radio wave from a current station that is a base station before the handoff and a reception power of a radio wave from a next station that is a base station after the handoff to the control device for each handoff; and the control device comprises: a calculation unit configured to calculate a first distance that is a distance between the current station and the mobile terminal on the basis of a difference between a reported value of the reception power of the radio wave from the current station and an output power of the current station, and to calculate a second distance that is a distance between the next station and the mobile terminal on the basis of a difference between a reported value of the reception power of the radio wave from the next station and an output power of the next station; a database configured to store distance data between the base stations in a database form; and an update unit configured to update the distance data by a minimum value of a sum of the first and the second distances.