| 摘要 |
PURPOSE:To attain the effective utilization of frequencies and to enhance the transmission reliability by making radio channel allocation efficient in the mobile communication system of the cell system. CONSTITUTION:Radio channels of a same frequency are arranged based on the combination of channel groups having plural repetitive distances comprising channel groups ch1-ch9 whose repetitive distance is short and channel groups ch10-ch16 whose repetitive distance is long. In the case of communication, a signal is sent from a channel whose repetitive distance is short at first and when no reply comes from an opposite station, a channel whose repetitive distance is long is selected and then the signal is sent therefrom. Thus, number of required radio channels is reduced thereby improving the reliability. |
