Patent ID: 7643494

Claim:
An interworking apparatus, comprising: an internet protocol (IP) sending/receiving unit coupled to an IP network; an ATM adaptation layer (AAL)2 sending/receiving circuit coupled to a wideband code division multiple access (WCCDMA) network; and a data processing circuit between the IP sending/receiving unit and AAL2 sending/receiving unit, the data processing circuit processing data in a format suitable for interworking between the WCDMA network and IP network, wherein the data processing unit comprises: an AAL2 processing unit to separate CPS packets from an ATM payload when data is received from the AAL2 sending and receiving unit, and to assemble CPS packets into an ATM payload when data is received from the IP network; a user plane (UP) protocol processing unit to add or remove an UP protocol header to or from data of the CPS packet payload; a real-time transport protocol (RTP) processing unit to add or remove a RTP header; and an IP processing unit to add a user datagram protocol (UDP) header and an IP header to data input from the RTP processing unit, and remove the UDP header and the IP header from data input from the IP processing unit, wherein, if the data delivered from the AAL2 processing unit is voice data, the UP protocol processing unit delivers the delivered data to the RTP processing unit without adding an UP protocol header thereto.