| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the cost of the whole radio determination system by installing a base station having only a simple transmitting/receiving function on the infrastructure side and reducing the number of base stations having complicated transmitting/receiving functions. Ž<P>SOLUTION: Radio signals R1 are asynchronously transmitted from a plurality of base stations A, B to at least one base station P and a mobile terminal M. When the base station P transmits a radio signal R2 to the mobile terminal M in response to the radio signal R1, the receiving time of receiving the radio signal R1 and the transmitting time of transmitting the radio signal R2 are included in the radio signal R2 and transmitted. The position of the mobile terminal M is determined by operation based on the receiving time of the radio signal R1 received by the mobile terminal M, the receiving time of the radio signal R2 received by the mobile terminal M, and the receiving time and transmitting time included in the radio signal R2 received by the mobile terminal M. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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