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An improved time division multiple access (TDMA) satellite transmission system uses N TDMA stations and employs a signal format in which successive time frames begin with a header containing synchronizing and control signals generated by a selected TDMA and followed by N time slots, and in which eac

An improved time division multiple access (TDMA) satellite transmission system uses N TDMA stations and employs a signal format in which successive time frames begin with a header containing synchronizing and control signals generated by a selected TDMA and followed by N time slots, and in which each TDMA station generates and transmits data packets having a high energy level during a unique time slot assigned to each TDMA and in which each TDMA transmits data packets only during its assigned time slot, and further in which at least some of the TDMA\s do not transmit data packets in the available time during the assigned time slot, thereby leaving unpredictably occurring idle time. Apparatus is provided for using a substantial portion of the idle time. The apparatus includes a plurality of random access terminals (RATS) each constructed to generate and transmit a data packet, having a lower energy level then the TDMA energy level, to any given single time slot during each frame and logic apparatus is provided for selecting such given single time slot on a predetermined statistical basis. Each RAT is capable of receiving all successfully transmitted data packets and determines the successful or non-successful transmission of any data packet originating therefrom. Data is retransmitted by the RAT\s during a subsequent frame when the originally scheduled RAT transmission is not successfully completed.

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In a time division multiple access (TDMA) communication system, a plurality of TDMA stations each capable of transmitting and receiving packets of data having an energy level>E1 modulated upon a carrier in a uniquely assigned corresponding time slot in a plurality of N time slots forming, together w

In a time division multiple access (TDMA) communication system, a plurality of TDMA stations each capable of transmitting and receiving packets of data having an energy level>E1 modulated upon a carrier in a uniquely assigned corresponding time slot in a plurality of N time slots forming, together with a synchronizing header, a TDMA frame, each packet of data being transmitted or received from a given TDMA station during said uniquely assigned time slot and wherein at least some of said time slots are being utilized during less than 100% of the available time, a circuit for utilizing the unused time in said time slots comprising: a plurality of random access terminals (RATS), each capable of generating and transmitting a packet of data having an energy level2 to any given single time slot during each frame and each comprising time slot selecting means for selecting said given single time slot on a predetermined statistical basis, and where E1 is sufficiently greater than E2 so that a data packet transmission from a TDMA will completely obscure a data packet transmission from a RAT; and each of said plurality of RATS further comprising means for receiving packets of data transmitted by any TDMA or any RAT and for verifying the successful or non-successful transmission of any data packet originating from said each RAT and for retransmitting any non-successfully transmitted data packet from said each RAT during a subsequent frame.