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Air-to-ground communication system

  • US 5,123,112 A
  • Filed: 08/02/1990
  • Issued: 06/16/1992
  • Est. Priority Date: 08/02/1990
  • Status: Expired due to Term
First Claim
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1. A method of operating one of a plurality of mobile radio units in a system for conducting communications between said plurality of mobile radio units and a plurality of base stations, said method operating to conserve frequency spectrum available for said communications, and said method comprising the steps of:

  • detecting a first signal which occurs periodically within a pilot frequency channel;

    identifying a first one of a predetermined number of time slots within which said first signal periodically occurs;

    detecting a second signal which occurs periodically within said pilot frequency channel;

    identifying a second one of said predetermined number of time slots within which said second signal periodically occurs, said first and second time slots differing from one another;

    obtaining, from said first and second signals, data descriptive of voice frequency channels available for use by said one radio unit; and

    establishing a voice communication link over one of said voice frequency channels.

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