| 摘要 |
PURPOSE:To avoid the electromagnetic wave interference at the boundary area, by alternately performing transmission with drive control alternately for the radio base stations adjacent each other. CONSTITUTION:When the receiver 25-2 is called out, the controller 22 produces call out signal and delivery start signal to the call out unit 21. The call out signal and the transmission start signal are alternately outputted by every T seconds to the radio base stations 24-1 and 24-2, which are alternately operated by T seconds with the transmission start signal and transmit the transmission wave f1 modulated with the call out signal. Accordingly, the receiver 25-2 alternately receives the transmission wave f1 from the base stations 24-1 and 24-2, and the call out signal can be identified and detected from the transmisstion wave f1 modulated with the corresponding call out signal. |
