When a network pages the temporary user mobile identifier of a mobile station, the mobile station sends a response to the network. Next, the network checks the authenticity of the user using a ciphering key, corresponding to the temporary user mobile identifier and a random number. If the temporary user...http://www.google.de/patents/US20090197646?utm_source=gb-gplus-sharePatent US20090197646 - METHOD AND SYSTEM FOR MOBILE COMMUNICATIONS
