Other cell sites used as reference point to cull satellite ephemeris information for quick, accurate assisted locating satellite location determination
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United States of America Patent
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Aug 12, 2008
Grant Date -
Jan 24, 2008
app pub date -
Jul 11, 2007
filing date -
Oct 15, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A geometric shape (e.g., an inverted cone) is computed above a given `reference point` defined from locations of cell sites OTHER than the cell site currently servicing a given wireless device, to provide a best-guess as to a near-future location of a mobile wireless device. Locating satellites (e.g., GPS) are culled into a preferred group and communicated to mobile devices within a particular region (e.g., serviced by a particular base station). The culled locating satellites may select visible locating satellites, or more preferably those locating satellites currently within a cone of space above the relevant base station, for communication by a mobile device within the service area of a base station. Thus, cell sites other than the one in use by the relevant wireless device may be specifically used to determine a reference point for culling the ephemeris information used to expedite Assisted GPS location determinations.
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