Patent ID: 6023604
Filing Date: 2000-02-08
Classification: H04B,H04H

Abstract:
A transmission control apparatus of an earth station for satellite communication in a satellite communication system comprising:a plurality of earth stations for satellite communication:a transmission channel shared between the plural earth stations; anda satellite repeater in which transmission signals are communicated between the respective earth stations via the satellite repeater;at least one of the earth stations including transmission control means forstopping an initiation of a transmission of a transmission signal by the at least one earth station upon detection of a reception signal via a reception channel corresponding to a transmission channel of the at least one earth station, andif the reception signal is detected during the transmission of the transmission signal from the at least one earth station, continuing the transmission of the transmission signal until a predetermined transmission of the transmission signal is completed,wherein the transmission control means includes:a reception signal sense circuit for sensing the reception signal via the reception channel and producing a reception sense signal in response thereto;a transmission controller for transmitting a transmission ON signal if the reception sense signal has not been received before reception of a transmission ON control signal indicating transmission of the transmission signal from the at least one earth station, the transmission ON signal indicating transmission of the transmission signal, the transmission controller continuing the transmission of the transmission ON signal until a transmission OFF control signal is received; anda transmission signal ON/OFF circuit for activating the transmission of the transmission signal only when the transmission ON signal is being received.