A method for IP [=Internet Protocol] communication between a mobile terminal and its correspondent node in a mobile radio network. The method comprises establishing (2-2) an IP connection between the mobile terminal and its correspondent node. After detecting a period of inactivity in the IP connection,...http://www.google.de/patents/US20070019610?utm_source=gb-gplus-sharePatent US20070019610 - Maintaining an IP connection in a mobile network
