| 摘要 |
PURPOSE:To improve line quality by channel switching at high speed under fading environment by providing a line quality deterioration detection circuit and a control part by whose instruction the channel switching is performed. CONSTITUTION:The control part 12 retrieves a null slot on another frequency to satisfy prescribed line quality when a frequency switching signal is inputted from the line quality deterioration detection circuit 11, and decides a channel switching destination slot. Thence, a transmission burst can be comprised by generating control data to designate the channel switching destination slot and multiplexing it on a transmission signal by a modulator 58, then, it is transmitted to a mobile station. The control part 12 switches the frequencies of local oscillation signals generated by frequency synthesizers 62, 63, and those signals are transmitted to receivers 53, 54 and a transmitter 59, and switching to a designated channel can be performed. The mobile station receiving a transmittion burst from a base station reads the slot of a channel switching destination from the control data, and switches the frequency. |
