3GPP has defined the MBMS system for mobile broadcast over the Universal Mobile Telecommunications System (UMTS). The main motivation was to improve the network and air capacity usage by deploying point-to-multipoint delivery. The Broadcast-Multicast-Service Center (BM-SC) is a new network component that plays a major role in enabling multicast/broadcast services. It fulfills several functions such as service announcement, data delivery, content encryption, and security key distribution. The BM-SC is also responsible for setting up the MBMS bearers.