| 摘要 |
PURPOSE:To reduce the calling disabled period of a mobile station by supervising normally a line broadcasting an idle line signal assigned to each service area and information designating said line, and broadcasting the idle line signal to other channel when the both are dissident for a prescribed period in a car telephone system. CONSTITUTION:A monitor 14 reads the designation of idle line signal broadcast radio frequency broadcasted on a control line 11 normally, allows an idle signal broadcast circuit locking section 15 to lock a line 12 to which the idle line signal is broadcast from the said information and supervises that the idle line signal is broadcast onto the line. This supervision is applied to the corresponding line in order at each service area. When the both are dissident (the idle line signal is not detected for a prescribed period), a dissidence signal is transmitted to a master station, and the master station designates a line in other radio frequency than the line until now to broadcast the idle line signal and also broadcast line by using a control radio circuit. |
