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Arrangement and method for establishing radio communication in a system

  • US 4,409,687 A
  • Filed: 04/14/1981
  • Issued: 10/11/1983
  • Est. Priority Date: 10/30/1978
  • Status: Expired due to Term
First Claim
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1. An arrangement for establishing communication over one of a plurality of radio frequency channels between a first one of a plurality of radio stations and a second one of the plurality of radio stations through a repeater station, said arrangement comprising:

  • a. first means for placing said first station in an idle mode and for causing said first station to scan said radio frequency channels;

    b. second means for stopping the scan caused by said first means in response to a predetermined group signal transmitted by said repeater on one of said channels, and enabling said first station to be operated on said one channel in response to said predetermined group signal thereon;

    c. third means for alternatively placing said first station in a call originate mode and for causing said first station to scan said radio frequency channels; and

    d. fourth means for stopping the scan caused by said third means on one of said channels and listening for a predetermined busy signal on said one channel and in response to the absence of said predetermined busy signal on said one channel, determining that said one channel is non-busy and enabling said first station to be operated on said non-busy channel in response to said absence of said predetermined busy signal thereon, and in response to the presence of said predetermined busy signal, continuing said scanning.

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