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Multimedia Broadcast Multicast Services (MBMS) is a point-to-multipoint interface specification for existing and upcoming 3GPP cellular networks, which is designed to provide efficient delivery of broadcast and multicast services, both within a cell as well as within the core network. For broadcast transmission across multiple cells, it defines transmission via single-frequency network configurations. Target applications include mobile TV and radio broadcasting, as well as file delivery and emergency alerts. == Deployment == MBMS Mobile Broadcast technology has never been deployed by any operator in the world, as opposed to other technologies such as DVB-H, ATSC-MH or ISDB-Tmm. Various mobile operators in the UK had conducted trials for MBMS-based mobile TV.〔(Orange, T-Mobile UK plan MBMS-based mobile TV trial in the U.K. )〕 There is no indication that these trials resulted in any commercial deployment. In 2013,〔(Verizon Eyes Broadcast Over LTE for Super Bowl 2014 ) By Chloe Albanesius, PC Magazine, January 8, 2013〕 Verizon was the first operator to announce that it will launch eMBMS services, in 2014, over its LTE networks. eMBMS is the LTE version of MBMS. AT&T subsequently announced plans to use the 700 MHz Lower D and E Block licenses it acquired in 2011 from Qualcomm for an LTE Broadcast service.〔(AT&T to use Lower 700 MHz D and E Block spectrum for LTE Broadcast ) By Phil Goldstein, FierceWireless, September 24, 2013〕 In 2014, several major operators are lining to deploy and test the technology. The frontrunners being Verizon,〔(Verizon Delivers LTE Multicast Over Commercial 4G LTE Network in Indy )〕 Reliance 〔(RJIL to invest in LTE broadcast technology )〕 and Kt. Questions remain whether the technology is an optimisation tool for the operator or if an operator can generate new revenues with it. Several studies have been published on the domain identifying both cost savings and new revenues.〔(An Analysis of 14 Different LTE Broadcast Business Cases )〕 In July 2014, Nokia Networks demonstrated the use of LTE Broadcast to replace Traditional Digital TV.〔(Nokia Networks first to trial LTE for national TV broadcasting )〕 This use case remains controversial as some study are doubting about the capability of LTE Broadcast to address this use case efficiently in its current version.〔(Delivery of Broadcast Content over LTE )〕 In August 2014, Ericsson and Polkomtel successfully tested LTE broadcast technology by streaming the opening game of the 2014 World Volleyball Championship to hundreds of guests at Warsaw’s National Stadium in Poland on August 30.〔http://www.ericsson.com/news/1852728〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Multimedia Broadcast Multicast Service」の詳細全文を読む スポンサード リンク
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