Alternating sequential half duplex communication system

  • US 4,979,170 A
  • Filed: 01/19/1988
  • Issued: 12/18/1990
  • Est. Priority Date: 01/19/1988
  • Status: Expired due to Term
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First Claim
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1. A communication system for transferring messages between central communication stations and one or more of a plurality of mobile terminals through Earth orbital relay satellites, comprising:

  • at least one central communication station having first transceiver means for transmitting a first communication signal in the form of Time Division Multiplexed communication signals, which comprise a series of N channels which are separated into A address channels and D data channel;

    said central communication station further comprising;

    receiver assignment means for detecting which of said plurality of mobile terminals each message is directed to;

    channel assignment means for assigning at least one channel to each of said messages at a time from said D channels;

    address control means for transferring a terminal address and an associated channel assignment onto one of said A channels in response to input messages intended for a corresponding terminal; and

    message input means connected to said channel assignment means for receiving digital messages and transferring said messages onto said D channels in response to an assignment from said channel assignment means; and

    at least one mobile terminal having second transceiver means for receiving and demodulating said first communication signal, and for transmitting at a predetermined transmit duty cycle, second communication signals to at least one of said central communication stations.

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