Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2007-10-23
2007-10-23
Perez-Gutierrez, Rafael (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
Reexamination Certificate
active
10938460
ABSTRACT:
A wireless node location mechanism that employs a differential signal strength metric to reduce the errors caused by variations in wireless node transmit power, errors in signal strength detection, and/or direction-dependent path loss. As opposed to using the absolute signal strength or power of an RF signal transmitted by a wireless node, implementations of the location mechanism compare the differences between signal strength values detected at various pairs of radio receivers to corresponding differences characterized in a model of the RF environment. One implementation searches for the locations in the model between each pair of radio receivers where their signal strength is different by an observed amount.
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Small, J., Smailagic
Davi Gregg Scott
Dietrich Paul F.
Airespace, Inc.
Au Gary
Perez-Gutierrez Rafael
Spolyar Mark J.
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