| 摘要 |
The invention provides a transmission power control apparatus for a mobile radio satellite communication system which allows frame synchronization maintenance and synchronization acquisition of a receiving station and optimum transmission power control with a simple construction which does not effect complicated control. The transmission power control apparatus includes a transmission power control loop provided in each of a gateway station and a terminal/mobile station for controlling a transmission power of the station. The transmission level during transmission is monitored and compared with a preset transmission level to change over an average time for sampling of the error between the transmission levels to vary the response speed of the transmission power control loop. When the channel for current use is to be changed over from a signalling channel to a communication channel, the transmission power is controlled so that there is no trouble for continuous synchronization of the reception side. But, when the channel is to be changed over from the communication channel to the signalling channel, the transmission power is controlled rapidly to a standard level so that there is no trouble in synchronization acquisition or data transmission. |
