The mobile telephone system employs a fleet of satellites and a set of gateway ground stations arranged around the globe for handling communications to and from mobile communication units such as mobile telephones. Signals are transmitted between a subscriber unit and the nearest gateway via one or more...http://www.google.co.uk/patents/US6073013?utm_source=gb-gplus-sharePatent US6073013 - Method and apparatus for performing position-based call processing in a mobile telephone system
