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Method of creating and utilizing diversity in a multiple carrier communication system

  • US 8,374,613 B2
  • Filed: 03/31/2008
  • Issued: 02/12/2013
  • Est. Priority Date: 08/08/2002
  • Status: Active Grant
First Claim
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1. A method of operating a wireless terminal in a cell which includes a base station which transmits at least two carrier signals at different power levels, said at least two carrier signals including a first carrier signal having a first carrier frequency and a second carrier signal having a second carrier frequency, the method comprising:

  • operating said wireless terminal to communicate with said base station using said first carrier signal over a period of time;

    during said period of time, checking a plurality of said at least two carrier signals to determine channel interference associated with each of said at least two carrier signals;

    estimating by said wireless terminal, intersector channel interference due to transmissions from another sector of said base station;

    identifying at least one sector boundary carrier frequency based on said intersector channel interference;

    determining candidate carrier frequencies by considering traffic loading, power, and noise levels, wherein said candidate carrier frequencies exclude said at least one sector boundary carrier frequency; and

    initiating an intercarrier handoff based on the intersector channel interference, the intercarrier handoff occurring between carrier signals used by said base station, while said first carrier signal still provides a signal to noise ratio of at least 0 dB and another one of said carrier signals is subject to lower channel interference, wherein said intercarrier handoff involves a carrier signal having one of said candidate carrier frequencies.

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