A method for estimating position using WLAN access point radio propagation characteristics in a WLAN location based service is provided. A location-based services system has a plurality of Wi-Fi access points in a target area. The Wi-Fi access points are positioned at geographic locations and have signal...http://www.google.com/patents/US7916661?utm_source=gb-gplus-sharePatent US7916661 - Estimation of position using WLAN access point radio propagation characteristics in a WLAN positioning system
