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Methods and systems for deriving seed position of a subscriber station in support of unassisted GPS-type position determination in a wireless communication system

  • US 8,299,960 B2
  • Filed: 09/25/2008
  • Issued: 10/30/2012
  • Est. Priority Date: 03/22/2005
  • Status: Active Grant
First Claim
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1. A method of determining a position using a data structure in memory of a subscriber station in a wireless communication system, the data structure having a plurality of entries, each entry comprising a stored position associated with a value of a parameter obtainable from overhead messages, the method comprising:

  • operating in an unassisted position location mode;

    obtaining a particular value of the parameter from an overhead message;

    determining that an entry exists in the data structure based on the obtained particular value;

    accessing the entry to obtain a seed position corresponding to a position estimate of the subscriber station associated with a position uncertainty smaller than another position uncertainty associated with another position estimate of the subscriber station stored in another entry of the data structure; and

    determining, using the seed position, a position from signals from a satellite position system.

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