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Method and apparatus for mobile assisted handoff

  • US 5,428,816 A
  • Filed: 09/09/1993
  • Issued: 06/27/1995
  • Est. Priority Date: 09/09/1993
  • Status: Expired due to Term
First Claim
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1. A method of handing off an on-going communication of a mobile unit leaving a serving cell to a neighboring cell of a cellular communication system, wherein the mobile unit has a scanning receiver for measuring received signal strength of a predetermined maximum number of scanned channels in a scanning sequence, the method comprising the steps ofgenerating a measurement list at the serving cell that includes channels of a plurality of designated neighboring cells,requesting the mobile unit to measure a plurality of channels of the plurality of designated neighboring cells;

  • reporting by the mobile unit to the base station of the serving cell, the channel quality measurements;

    replacing a portion of the plurality of channels with unreported channels of the generated measurement list at times when none of the reporting channels meet a handoff criteria and the total number of cells of the measurement list exceeds a maximum number of channels scannable in a sequence by the mobile unit;

    repeating the steps of generating, requesting, reporting, and replacing until all the channels of the measurement list are scanned by the mobile unit or until one of the channels of the measurement list meets the handoff criteria, whichever is first to occur; and

    performing handoff to said one of the channels meeting the handoff criteria.

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