| 摘要 |
PURPOSE:To attain surely channel switching by searching automatically a control channel of a radio group used by a mobile station and displaying a radio zone possible for communication or rasing an alarm. CONSTITUTION:Start information is given to a timer 5 when a receiving input is decreased to a value below a limit value and count is started. The operating time of the timer 5 is changed by the receiving level, and when a receiving level is a communication limit or below, the timing is short, and when the receiving level is the communicating limit value or over but low considerably, the timing time is extended by the level, and when the receiving input is large, the timing is brought into an infinite value, information is given to a channel switching memory section 6, control channel information of radio zones a-h used by a mobile station M is read from the memory section 6, the channel information is given to a radio channel switching device 3 for attaining channel switching. |
