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Accuracy Assessment in Assisted Gps Positioning

  • US 20080316091A1
  • Filed: 02/15/2006
  • Published: 12/25/2008
  • Est. Priority Date: 02/15/2006
  • Status: Active Grant
First Claim
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1. A method for providing assistance data when determining a position of a mobile terminal being connected to a cellular communication system via a base station, comprising the steps of:

  • providing satellite time reference data;

    said satellite time reference data comprising a relation between a frame time of said cellular communication system and a satellite reference time;

    adapting a search window to a specific satellite from which a satellite ranging signal emerges based at least on said satellite time reference data; and

    providing said search window to said mobile terminal;

    said step of providing satellite time reference data in turn comprising the steps of;

    measuring quantities representing said relation in a multitude of mobile terminals over time;

    reporting said measured quantities representing said relation from said multitude of mobile terminals to a positioning node of said cellular communication network;

    calculating, in said positioning node, an estimate of said relation from said reported measured quantities representing said relation, as well as calculating an estimated inaccuracy of said estimate of said relation;

    whereby said step of adapting said search window is based on said estimated relation and said estimated inaccuracy of said estimated relation.

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