A General Packet Radio Service (GPRS) Accessed Extended Mobile Internet Protocol (EMIP) [G-EMIP] network is provided for wireless mobile device access to external packet data networks. Domains are defined to incorporate a subnet of standard GPRS and EMIP network entities accessed through a Domain Router....http://www.google.de/patents/US6842462?utm_source=gb-gplus-sharePatent US6842462 - Wireless access of packet based networks
