Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2003-12-19
2010-06-15
Phan, Huy (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C340S993000, C342S357490, C342S357490, C342S450000, C342S451000, C342S457000, C455S456200, C455S456300, C455S456500, C455S456600, C455S404200, C455S556200
Reexamination Certificate
active
07738881
ABSTRACT:
The present invention leverages changes in the sensed strength of radio signals at different locations to determine a device's location. In one instance of the present invention, inference procedures are used to process ambient commercial radio signals, to estimate a location or a probability distribution over the locations of a device. In another instance of the present invention, a system utilizes learning and inference methods that are applied to rank vector of signal strength vectors. Moving to such rank orderings leads to systems that bypass consideration of absolute signal strengths in location calculations. The present invention facilitates approximations for locating a device by providing a system that does not require a substantial number of available ambient signal strengths while still providing useful location inferences in determining locations.
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Cermak Gerald F.
Horvitz Eric J.
Krumm John C.
Miller Edward C.
Youssef Adel Amin AbdelAzim
Heiber Shantell
Lee & Hayes PLLC
Microsoft Corporation
Phan Huy
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