Abstract: A mobile data communications system includes a cellular wireless data communications network, such as a GPRS or CDPD network, including a plurality of base stations that communicate with terminals according to a first radio interface. The plurality of base stations are coupled to a control node, such as a GPRS Serving GPRS Support Node (SGSN) or a CDPD Mobile Data Intermediate System (MD-IS), that administers services, such as mobility management and billing, for terminals communicating with the base stations. The system also includes a wireless local area network (LAN), such as a mobile IP network, that is operative to communicate with terminals according to a second radio interface. The system further includes a mobile data internetworking system that is coupled between the control node and the wireless local area network and that provides data communications therebetween.

Abstract: A mobile data communications system includes a cellular wireless data communications network, such as a GPRS or CDPD network, including a plurality of base stations that communicate with terminals according to a first radio interface. The plurality of base stations are coupled to a control node, such as a GPRS Serving GPRS Support Node (SGSN) or a CDPD Mobile Data Intermediate System (MD-IS), that administers services, such as mobility management and billing, for terminals communicating with the base stations. The system also includes a wireless local area network (LAN), such as a mobile IP network, that is operative to communicate with terminals according to a second radio interface. The system further includes a mobile data internetworking system that is coupled between the control node and the wireless local area network and that provides data communications therebetween.

Abstract: The dedicated telecommunications lines functioning as data trunks carrying voice and data between the switching points of a wireless communications system are replaced by virtual data trunks implemented over an Internet Protocol network. An IP gateway associated with each switching point receives a plurality of data trunks carrying communications data. The data are assembled into IP packets, with a source address associated with the gateway and a destination address derived from which data trunk carried the communications data. The IP packets are sent across an IP network to the destination gateways. Incoming data packets, with a destination IP address matching that associated with the IP gateway, are received at the gateway. The data are extracted from the IP packets, and directed to one of the data trunks to the switching point, based on the IP source address of the packet.