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Cellular mobile communications system using frequencies commonly shared by neighboring cells for handoff operations

  • US 5,319,795 A
  • Filed: 02/27/1992
  • Issued: 06/07/1994
  • Est. Priority Date: 02/27/1991
  • Status: Expired due to Term
First Claim
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1. A cellular mobile communications system for serving mobile terminals within a plurality of cells, the system including a plurality of base stations respectively located at the cell sites;

  • each of said base stations having unique frequencies and common frequencies shared with other base stations, each of the base stations comprising;

    receiver means for receiving a signal from a given mobile terminal;

    means for assigning one of the unique frequencies to said given mobile terminal in response to a call request;

    field strength detector means for detecting the field strength of the signal received by said receiver means;

    means for assigning one of the common frequencies to said given mobile terminal if the detected field strength is lower than a first threshold value;

    comparator means for receiving a field strength signal from a neighboring base station indicating the field strength of a version of the signal of said given mobile terminal at said neighboring base station and comparing the field strength signal with a second threshold value;

    diversity combiner means for receiving said version of the signal of said given mobile terminal from said neighboring base station and combining the same with the signal of said given mobile terminal received by said receiver means when the field strength signal is determined by said comparator means to be higher than said second threshold value, andeach of said mobile terminals comprising means for tuning to frequencies assigned by the base stations and diversity combiner means for combining a signal from the base station which assigned said common frequency with a signal from said neighboring base station.

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