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Mid-call synchronization for U-TDOA and AOA location in UMTS

  • US 8,204,511 B2
  • Filed: 06/29/2011
  • Issued: 06/19/2012
  • Est. Priority Date: 12/13/2007
  • Status: Active Grant
First Claim
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1. In a wireless location system (WLS) for use in locating a mobile transmitter, a method for determining frame and slot timing information for use in receiving an uplink signal from a user equipment device (UE) assigned to an uplink Dedicated Physical Control Channel (DPCCH), comprising:

  • receiving uplink DPCCH signals in the uplink DPCCH at a location measurement unit (LMU) of the WLS, said uplink DPCCH signals being formatted into multiple frames and multiple slots per frame;

    detecting a predefined bit pattern known to be present in a plurality of predefined slots of the uplink DPCCH signals;

    examining the DPCCH signals across multiple frames;

    determining the frame and slot timing information for the uplink DPCCH based on the detected bit pattern; and

    using the frame and slot timing information, collecting uplink signals from the UE for use in location processing.

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