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In the last years, the demand for multimedia services increased significantly. Mobile TV was recently lunched in several countries resulting already in commercial success. The 3rd Generation Partnership Project (3GPP) specifies two different systems for delivering multimedia content: The IP Multimedia Subsystem (IMS) and the Multimedia Broadcast Multicast Service (MBMS). IMS is the 3GPP evolved vision of the core network, providing resource, admission and charging control. MBMS enables broadcasting and multicasting packet data in UMTS networks to large user groups. Up to now, these completely independent systems share no common interfaces. In 3GPP Release 7 and 8 an efficient integration of IMS and MBMS is currently being studied.
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