A system for locating a client in a wireless network. The system includes at least three access points. Each access point is adapted to wirelessly communicate with a client having a location using packeted data, be placed in wired data communication within a selected data network; and to share a common...http://www.google.de/patents/US7499423?utm_source=gb-gplus-sharePatent US7499423 - System and method for clock distribution and synchronization and radio location
