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Method for optimizing forward link coverage in code division multiple access (CDMA) network

  • US 6,456,652 B1
  • Filed: 03/29/1999
  • Issued: 09/24/2002
  • Est. Priority Date: 03/28/1998
  • Status: Expired due to Term
First Claim
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1. A method for optimizing forward link coverage in a code division multiple access (CDMA) network comprising the steps of:

  • a) determining the morphology of a forward link coverage area;

    b) determining azimuth orientation, tilt, gain and type of a base station antenna;

    c) calculating power rating per channel for said coverage area;

    d) determining RF output power per frequency assignment per sector for said coverage area;

    e) simulating orthogonal channel noise which models noise generated by wireless communication traffic in an operational communication system of many subscribers;

    f) establishing forward power control parameters;

    g) performing a field-drive-test in which a mobile station receives test communication signals transmitted from said base station within specific regions of said coverage area, said mobile station measuring values for a received signal strength indicator (RSSI), a ratio (EC/IO) of pilot chip energy to total power spectral density, and a forward frame error rate (FFER);

    h) comparing the measured RSSI value to a first threshold;

    i) comparing said measured ratio (EC/IO) to a second threshold;

    j) comparing said measured FFER to a third threshold;

    k) determining if chip delay measured at the mobile station exceeds a fourth threshold, and if so, making adjustments to base station equipment to attempt to reduce said chip delay;

    l) determining whether a shade area exists by comparing said RSSI, EC/IO, FFER with a basis of overall network design;

    m) determining whether transmit/receive links are balanced; and

    n) designating forward link coverage as being satisfied when comparisons to said first, second and third thresholds are favorable and the transmit/receive links are balanced;

    otherwise, making adjustments to base station equipment to attempt to correct unfavorable comparisons to said thresholds and to correct an imbalance between the transmit/receive links.

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