| With the development of communication networks and4G users increases, more and more wireless mobile network traffic come from the video and other media services. How to improve the transmission efficiency of4G networks become a hot research direction.In LTE transmission network, video transmission requires large amounts of wireless channel resources, often a cell can serve very limited video users, thus greatly limiting the system capacity and service quality of experience of the users. How to make the limited radio resources serve more users and increase the transmission efficiency of the system become a research focus. In this thesis, by studying the research status of the current wireless network video transmission and combining LTE network multicast transport protocol, a dynamic adaptive video transmission scheme combining unicast and multicast transmission has been proposed.In this thesis, in order to improve the transmission efficiency of video services, the multicast transmission is proposed to video services, and in order to optimize transmission efficiency, the proposed video transmission combine multicast and unicast transmission intelligently and dynamic determine the transmission mode and users video bit rate, so we can save the radio channel resources, but also can improve the throughput and overall service quality of experience of the entire system, to improve the transmission efficiency of video services.To verify the video transmission optimization, this thesis join MBMS transmission protocol on NS3open source simulation platform to build a LTE multicast transmission simulation system, also implement DASH and made a multicast transmission scheme on the simulation platform implementation. In this thesis, the optimization video transmission scheme even though can dynamically determine the user’s transmission mode and rate, but the efficiency of the algorithm still has room for improvement. |
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