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Inter-frequency handoff evaluation method

  • US 6,917,808 B1
  • Filed: 04/28/2000
  • Issued: 07/12/2005
  • Est. Priority Date: 04/28/2000
  • Status: Expired due to Term
First Claim
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1. A method of evaluating need for handoff of a mobile station in a wireless communication system from a base station operating at a first frequency (hereafter “

  • f1 base station”

    ) to a base station operating at a second frequency (hereafter “

    f2 base station”

    ), said method comprising the steps of;

    evaluating a geographic positioning of said mobile station in respect to a signal coverage area of said f1 base station and a signal coverage area of said f2 base station;

    computing an aggregate value of a set of pilot energy signals received at said mobile station;

    obtaining a value of a pilot energy signal transmitted by said f2 base station and comparing it with said aggregate value; and

    determining that a hand off of said base station connection should be made if said aggregate value is less than said f2 base station transmitted pilot energy signal value plus a preselected threshold value;

    wherein said aggregate value is computed according to the equation;

    AGG=10×

    log10

    (

    n=1k






    10EC10/On
    )
    where k=number of active set pilots.

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