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Even when a multi-spot beam is utilized, a demand assignment multiple access (DAMA) type satellite communication can be established between a plurality of satellite earth stations installed in one zone located opposite to another zone where a control station is installed, and between the control sta

Even when a multi-spot beam is utilized, a demand assignment multiple access (DAMA) type satellite communication can be established between a plurality of satellite earth stations installed in one zone located opposite to another zone where a control station is installed, and between the control station and the satellite earth station installed in the same zone. The control station transmits a channel setting signal for setting a communication channel to the satellite earth stations installed in the opposite zones by using a CSC signal, and further sets a channel of a transmitting/receiving unit in such a manner that after the CSC signal derived from the satellite earth station has been received, this CSC signal is returned thereto. A repeater station has a function such that repeater station receives the CSC signal to return this CSC signal, and also receives a communication signal to return this communication signal. The satellite earth station includes a delay device for setting a time defined as after the CSC signal is received, until a response signal is transmitted, based on the received delay data.

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[ What is claimed is:] [4.] A demand assignment multiple access (DAMA) type satellite communication system in which a CSC (common signalling channel) signal is transmitted/received via a satellite between a control station and a plurality of satellite earth stations by way of an SCPC (single channel

[ What is claimed is:] [4.] A demand assignment multiple access (DAMA) type satellite communication system in which a CSC (common signalling channel) signal is transmitted/received via a satellite between a control station and a plurality of satellite earth stations by way of an SCPC (single channel per carrier) communication system using a cross beam among a plurality of zones covered by a multi-spot beam from a single antenna in which communication from one earth station to another in the same zone via satellite is prohibited, and in response to a demand issued from said satellite earth station, a communication signal channel is automatically allocated, wherein said DAMA type satellite communication system comprises:delay time compensating means for compensating delay times in such a manner that said delay times defined after said CSC signal is transmitted from said control station to a first satellite earth station of a plurality of second satellite earth stations installed in a first zone and a second satellite earth station installed in a second zone until said CSC signal is received from said first and second satellite earth stations to said control station are equal to each other;in case of the CSC signal transmission/reception between said first satellite earth station within said first zone and said second satellite earth station within said second zone, means for returning a call request signal by said CSC signal transmitted from said first satellite earth station to said control station within said first zone and communication channel setting signal from said control station to said first satellite earth station at a repeater station having a repeater function, located in said second zone;in case of the CSC signal transmission/reception between two of said second satellite earth stations of a plurality of second satellite earth stations located in said second zone, means for returning communication signal at said control station after defining said communication channel by a PDC (primary DAMA controller) of said control station; andin case of the CSC signal transmission/reception between the control station and the satellite station, which are located within said first zone,means for returning at said repeater station located in the second zone, the call request signal by said CSC signal derived from said first satellite earth station within said first zone, said communication channel setting signal by said CSC signal derived from said control station, and said communication signal between the control station and the satellite earth station, located in said first zone.