A system and method of dynamically updating an almanac of base stations with wireless phones that are controlled by end users. First, second, and third location information are received respectfully from a first, second, and third wireless phones. A position of each wireless device is known. The distance...http://www.google.com.hk/patents/US7257413?utm_source=gb-gplus-share專利 US7257413 - Dynamic location almanac for wireless base stations
