| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a radio authentication device which can reduce battery consumption of a mobile device.SOLUTION: A radio authentication device comprises: a plurality of fixed devices 200b to 200d which transmit transmission instructions, respectively; and a mobile device 100b which, on receiving the transmission instruction from one of the plurality of fixed devices 200b to 200d, transmits mobile device identification information. The radio authentication device classifies the plurality of fixed devices 200b to 200d by grouping the fixed devices of which transmission ranges of the transmission instructions do not overlap with each other, and sets different transmission timing of the transmission instructions for the respective groups.</p> |
