Patent ID: 8948782
Filing Date: 2015-02-03
Classification: H04W

Abstract:
1. A method, performed by an apparatus, for determining proximity of a mobile device to a target location, the method comprising: identifying a signal sent by the mobile device and received by respective ones of a set of receivers including at least a first receiver and a second receiver, wherein the first receiver and the second receiver are positioned collinearly to the target location; determining a first signal-quality metric observed at the first receiver and a second signal-quality metric observed at the second receiver with respect to the signal; computing a ratio associated with distances from the mobile device to the first receiver and the second receiver, respectively, based on the first signal-quality metric and the second signal-quality metric; and determining whether the mobile device is within a proximity region defined in relation to the target location based on a comparison of the ratio with a ratio constant which is a ratio of a first distance between each point of a set of points of the proximity region surrounding the target location and the first receiver, and a second distance between the each point of the set of points and the second receiver.