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Sparsed U-TDOA wireless location networks

  • US 8,045,506 B2
  • Filed: 04/18/2007
  • Issued: 10/25/2011
  • Est. Priority Date: 04/18/2007
  • Status: Expired due to Fees
First Claim
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1. A computer-implemented, iterative method for designing a sparse wireless location system (WLS) from an initial network design stored on a non-transitory computer readable medium, wherein the sparse WLS is designed to be overlaid on a wireless communications system, comprising:

  • performing an intelligent WLS network design process to produce an initial network design;

    accessing said initial network design from the non-transitory computer readable medium;

    performing a preliminary network design analysis to determine that at least one of the following performance limiting factors affects said initial network design;

    downlink beacon discovery and uplink demodulation; and

    modifying the initial network design based on the performance limiting factor determined as affecting said initial network design, wherein said modifying comprises the following;

    (1) when the performance limiting factor is downlink beacon discovery, one or more of the following modifications is performed;

    deploying at least one enhanced downlink antenna;

    deploying downlink interference cancellation;

    deploying base transceiver station (BTS) synchronization;

    adding at least one location measuring unit (LMU) to the network design;

    determining that an Abis monitoring system (AMS) is not deployed, and then deploying at least one downlink-only location measuring unit (LMU) at an identified site; and

    determining that an Abis monitoring system (AMS) is deployed, and then enabling the use of Enhanced Beacon Synchronization (EBS) and AMS-derived beacon timing functions;

    (2) when the performance limiting factor is uplink demodulation, one or more of the following modifications is performed;

    determining that communications system demodulation data is enabled, and enabling a demodulated data feature;

    determining that communications system demodulation data is not enabled, and determining that an Abis monitoring system (AMS) is not deployed and enabling a mid-amble only correction feature;

    determining that communications system demodulation data is not enabled, and determining that an Abis monitoring system (AMS) is deployed and enabling an AMS-derived demodulated data feature;

    adding at least one location measuring unit (LMU) to the network design;

    adding at least one dedicated antenna facility to the network design; and

    saving the modified network design on the non-transitory computer readable medium.

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