Patent ID: 8285304

Claim:
A radio communication system that performs radio communication with a mobile terminal, the system comprising: the mobile terminal; a base station; a delay time acquiring unit configured to acquire a delay time of a signal transmitted between the mobile terminal and the base station; a position information acquiring unit configured to acquire a position of the base station; a calculating unit configured to calculate a position of the mobile terminal on the basis of the delay time acquired by the delay time acquiring unit, and the position of the base station acquired by the position information acquiring unit; and a providing unit configured to provide mobile station position information indicating the position of the mobile terminal, wherein when a predetermined exception condition is not satisfied, the providing unit provides, as the mobile station position information, the position of the mobile terminal calculated by the calculating unit, and when the predetermined exception condition is satisfied, the providing unit provides, as the mobile station position information, the position of the base station acquired by the position information acquiring unit, instead of using the position of the mobile terminal calculated by the calculating unit.