A new era began in October 2004 when the world’s ﬁ rst broadcast mobile TV services went live in Japan with the launch of satellite-based S-DMB services. The T-DMB services were soon to follow — these were launched in December 2005 in Korea. The DMB services were the culmination of many years of work in designing of protocols, air interfaces, and chipsets that would enable the broadcasting of multimedia to mobile devices. Prior to this, the only unicast mobile TV was available through 3G networks with their attendant constraints. The T-DMB services also preceded the DVB-H services in terms of launch in commercial net works. Digital mobile multimedia broadcast services, as the name suggests, include broadcast of multimedia content, including video, audio, data, and messages to mobile devices. These services, unlike the 3G mobile services, are provided by broadcasting of the content and hence have the capability to service an unlimited number of users. DMB services had their origin in Korea and are provided by using both the terrestrial mode of transmission and the satellite mode. The initiative for the development of DMB services came from the Ministry of Information and Communications (MIC) of Korea, who assigned the Electronics and Telecommunications Research Institute (ETRI) of Korea to develop a system for broadcast of mobile TV. The standards of S-DMB and T-DMB, which were formulated subsequently, received ETSI approval, paving the way for launches outside of Korea. The S-DMB services were provided by TuMedia, which was founded by Korea Telecom; the T-DMB services in Korea were licensed to multiple broadcasters. By the end of 2009, the DBM-T service in Korea had become the world’s largest terrestrial broadcast mobile TV service, with over 20 million users.