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Method for creating acquisition assistance information in assisted global positioning system

  • US 7,212,157 B2
  • Filed: 09/02/2004
  • Issued: 05/01/2007
  • Est. Priority Date: 10/31/2003
  • Status: Active Grant
First Claim
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1. A method for creating acquisition assistance information for acquiring of a global positioning system (GPS) signal in an assisted global positioning system (AGPS), the method comprising the steps of:

  • (a) receiving repeater information included in a mobile communication network of a terminal whose location is to be measured, in response to a request for the acquisition assistance information for acquiring of the GPS signal from the terminal;

    (b) determining a repeater delay introduced by a repeater that is present between the terminal and a base station that is synchronized with the terminal using the repeater information, wherein the repeater information is estimated through analysis of a base station signal that is observable by the terminal; and

    (c) creating the acquisition assistance information for acquiring of the GPS signal of the terminal based on the repeater delay;

    wherein a repeater delay determines a plurality of acquisition assistance information including Doppler information, pseudo distance information, Doppler search range, and pseudo distance search range; and

    (d) setting the repeater delay information to a previously set initial value if the repeater delay information is not available.

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