| 摘要 |
PURPOSE:To attain the transmission/reception of a control signal for plural calls simultaneously by adopting a spread spectrum communication system for a control channel and making a spread spectrum code correspondent to a mobile station telephone number. CONSTITUTION:The control channel 10 is used for the transmission/reception of a start response signal and the designation of a talking channel. The spread spectrum communication system such as the frequency hopping or direct spread system is adopted for the control channel 10. In the location or unlocation circulating system, it is required that the control channel is not a private channel but the occupied band width is made the same as that for the talking/control channel. Thus, the immunity to interception/disturbance is attained and the transmission/reception of the control signal for plural calls is attained. |
