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Location determination in wireless communication systems

  • US 8,477,690 B2
  • Filed: 07/27/2010
  • Issued: 07/02/2013
  • Est. Priority Date: 11/06/2009
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • configuring a transmission plan for a downlink location based services (D-LBS) zone based at least in part on resources available for transmission of location beacons, wherein the transmission plan comprises a pseudorandom transmission plan that assigns different base stations for transmission on different resources of the D-LBS zone to perform measurements of signal location parameters from multiple base stations or relay stations, or combinations thereof, of a network;

    setting a pseudorandom number generator to an initial value that depends on a cell identification if a superframe or a frame count is zeroed;

    for subsequently allocated D-LBS zones, calculating a recursion using the pseudorandom number generator and an initial cell identification value of the station;

    transmitting configuration parameters for the D-LBS zone from said configuring; and

    transmitting one or more location beacon signals on an assigned resource of the D-LBS zone based at least in part on the calculated recursion value.

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