Patent ID: 7680109

Claim:
A packet radio data network comprising a gateway node (GGSN) comprising routing functionality for tunnelling IP streams (packet data units) (PDU) to a mobile station via a given point of attachment of the mobile station to a radio access node (RAN), at least one serving node (SGSN) connected to the gateway node, for engaging in PDP context activation procedures which enable a given mobile station to perform packet switched communication with the external packet data network and enable charging of such communication, a plurality of radio access nodes (RAN), to which mobile stations are wirelessly connected to the serving node (SGSN), for transporting packet data from an external packet data network, the external packet data network comprising an Internet Service Provider (ISP), whereby at least the gateway node, subsequent to a PDP multipoint context activation procedure, establishes at least a first multicast tunnel between the gateway node and the at least one serving node, the first multicast tunnel carrying IP streams pertaining to at least two mobile stations belonging to a common multicast group; the at least one serving node comprising mobility management and security functions for the mobile stations, and the first multicast tunnel comprising combined IP streams pertaining to a plurality of multicast groups.