Demand-assignment communication system

摘要

A demand-assignment communication system is disclosed, in which a plurality of earth stations share a plurality of satellite communication channels in one satellite transponder frequency band, and in which a plurality of carriers with a plurality of transmission frequency bands determined according to transmission rate corresponding to plural kinds of communication circuits of different transmission rates are integrally handled and which, upon occurrence of a call from one of the earth stations to another, assigns to the call a satellite communication channel corresponding to the transmission frequency band necessary therefor. In accordance with the present invention, the frequency slot positions for the satellite communication channels and the order of assignment thereof are determined for each kind of transmission frequency bands necessary for the communication circuits, and each satellite communication channel is assigned to the frequency slot position therefor in the order of its assignment to comply with a request for assignment of one of the satellite communication channels to the call.