Method and system for determining the altitude of a mobile wireless device
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United States of America Patent
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Aug 2, 2011
Grant Date -
Feb 25, 2010
app pub date -
Nov 2, 2009
filing date -
Jul 30, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and system for determining the three-dimensional location of a mobile wireless device. In one implementation, the device is a cellular telephone making a 911 call from one floor of a multi-story building. An embodiment of the method of the invention includes establishing a database that associates transmission metrics with altitudes of x-y coordinate locations having more than one altitude at which the mobile wireless device could be located, receiving a communication from the mobile wireless device, determining an x-y coordinate location of the mobile wireless device, measuring a transmission metric of the mobile wireless device, and consulting the database to determine the altitude from the x-y coordinate location and the measured transmission metric. The transmission metric could be, for example, the transmission time or angle of arrival of a wireless signal received from the mobile wireless device.
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