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Handoff method for a cellular system

  • US 5,179,559 A
  • Filed: 07/27/1990
  • Issued: 01/12/1993
  • Est. Priority Date: 07/27/1990
  • Status: Expired due to Term
First Claim
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1. In a cellular communication system being divided into a plurality of cell sites, wherein each cell site includes a transceiver unit for providing communication to at least one communication unit, a method for handing off the communication unit from one cell site to another cell site comprising the steps of:

  • in the transceiver unit;

    a. determining the range of the communication unit from transceiver unit;

    b. transmitting an interrupt signal to the communication unit if the range exceeds a predetermined range;

    in the communication unit;

    c. measuring received signal quality of the adjacent cell sites in response to reception of said interrupt signal; and

    d. selecting an available cell site which provides the highest signal quality to the communication unit.

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