Determining wireless device locations
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United States of America Patent
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Sep 9, 2003
Grant Date -
Jan 2, 2003
app pub date -
Jun 29, 2001
filing date -
Jun 29, 2001
priority date (Note) -
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Abstract
Wireless network devices can obtain their geographical location by triangulating with access points that have precise time information. In response to a location prompt, a wireless device can send a transmission to multiple access points that are within its range. The different times at which the transmission is received at different access points can be collected and forwarded to a server, which can compute the location of the wireless device using triangulation techniques. The access points can calibrate their own time bases from time services received from global position satellites.
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