An inter-working function in a second generation wireless network is used as a transition node for provision of packet-data services by a packet-data service node located in a third generation network. Mobile stations operating in the second generation network that request packet-data services are connected...http://www.google.com/patents/US20020176382?utm_source=gb-gplus-sharePatent US20020176382 - Method and system for integration of second generation and third generation wireless networks
