Patent ID: 7302497

Claim:
A telecommunications system having a protocol architecture over an interface between nodes of the telecommunications system, wherein for a connection with a user equipment unit a protocol stack of the protocol architecture in the transport layer comprises: a link layer protocol; Internet Protocol on top of the link layer protocol; UDP Protocol on top of the Internet Protocol; wherein the system is arranged to exchange Asynchronous Transfer Mode (ATM) and ATM Adaptation Layer 2 (AAL2) protocols with the Internet Protocol and the UDP Protocol; wherein the interface having the protocol architecture is one, of: (1) an interface between a core network and a radio access network which carries circuit switched connections; (2) an interface between a radio network controller (RNC) and a base station; and (3) an interface between two radio network controllers (RNCs); wherein the connection is carried as a circuit switched connection over a radio interface between the user equipment unit and the radio access network; and wherein UDP port numbers of the UDP Protocol are used as connection identifiers.