Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2008-01-15
2008-01-15
Anderson, Matthew (Department: 2618)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456100, C455S456200, C455S457000, C342S387000
Reexamination Certificate
active
07319877
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 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 an instance of the invention, learning and inference methods are applied to rank vector of signal strength vectors. Moving to such rank orderings leads to methods that bypass consideration of absolute signal strengths in location calculations. The invention facilitates approximations for locating a device by providing a method 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
Amin Turocy & Calvin LLP
Anderson Matthew
Microsoft Corporation
Pan Yuwen
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