Patent ID: 7209751

Claim:
A system for detecting motion of a wireless device, comprising: a first wireless device configured for communicating wirelessly with at least a second wireless device; at least one of said wireless devices configured as a beacon sender for sending beacon frames containing signal strength information; at least one of said wireless devices configured as a beacon receiver for receiving said beacon frames; a computer processor associated with one of said wireless devices and configured for processing said signal strength information; and programming executable on said computer processor for performing acts comprising: calculating, from said signal strength information, differences in signal strength for a plurality of signal strength samples accumulated during a sampling period; performing a regression analysis on said differences in signal strength with respect to the number of samples in said plurality of signal strength samples; calculating, as a result of said regression analysis, a coefficient of determination; calculating, as a result of said regression analysis, a regression coefficient; and generating and outputting a proximity motion detection signal in response to determining that the regression coefficient is approximately equal to or greater than the quotient of (i) change in signal strength from start to end of the sampling period divided by (ii) the number of said plurality of signal strength samples, and further in response to determining that the coefficient of determination exceeds a threshold value.