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Fast forward power control during soft handoff

  • US 6,515,975 B1
  • Filed: 04/22/1999
  • Issued: 02/04/2003
  • Est. Priority Date: 04/22/1999
  • Status: Active Grant
First Claim
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1. A cellular communication system incorporating fast forward power control and having at least 2 BTSs (base transceiver stations), a BSC (base station controller and an MS (mobile station) comprising:

  • measuring means, comprising a part of each BTS in the system, for measuring the Eb/No (bit energy to noise density), at each BTS that is receiving reverse link transmissions from an MS, of reverse link FPC (forward power control) bit stream transmissions from said MS;

    BSC comparison means for periodically comparing the measured Eb/No to determine, during the time when an MS is in a handoff mode, which BTS is receiving the most reliable FPC data wherein the BTS determined to be is receiving the most reliable FPC data is designated hereinafter as BTS(x);

    further BSC comparison means for comparing the transmit power level of each BTS, other than BTS(x), with the transmit power level of BTS(x);

    BSC instructing means for instructing each BTS, other than BTS(x), whose power level differs from the transmit power level of BTS(x) by more than a predetermined value, to adjust the power level of transmissions to said MS to the level of BTS(x);

    BSC checking means for determining the number of BTSs in a soft handoff mode with respect to a given MS; and

    means for adjusting at least one of the incremental FPC, RPC (reverse power control) parameters and the lower limit of traffic channel gain as a function of the number of BTSs in a soft handoff mode with respect to said MS.

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