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High density cellular mobile radio communications

  • US 4,475,010 A
  • Filed: 05/05/1983
  • Issued: 10/02/1984
  • Est. Priority Date: 05/05/1983
  • Status: Expired due to Term
First Claim
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1. In a plural channel mobile communication system for serving mobile units from a plurality of cell sites each equipped with signal strength measuring apparatus and each having one or more antenna/channel groups, a method for transferring control of communications with a mobile unit from one antenna/channel group of one cell site to another antenna/channel group, comprising the steps of:

  • storing in a local cell site data base at each of said cell sites a list of nearby cell sites and a list of candidate hand-off antenna/channel groups and associated signal strength thresholds;

    ascertaining at said one cell site when the signal strength of said mobile unit drops below a prespecified threshold;

    responsive to said signal strength ascertaining step, accessing the local cell site data base at said one cell site to obtain said list of nearby cell sites and transmitting a command to said signal strength measuring apparatus of said nearby cell sites to measure and report the signal strength of said mobile unit;

    responsive to the receipt of said reports from said signal strength measuring apparatus, selecting from said accessed data base candidate list those antenna/channel groups associated with signal strength reports above said associated signal strength threshold.

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