| With the rapid development of mobile Internet technology, the demand for the wireless network is higher and higher, multi-hop cellular network has also made significant advances. The high quality video service has gradually become the universal demand for the mobile users, and the combination of multi hop cellular network and video transmission can meet the user’s request better.With the combination of Ad hoc network and traditional cellular network, multi-hop cellular network is a new kind of network. It combines the cellular base station equipment and multi-hop technology in Ad hoc network, so that each user not only can communicate directly with the base station, but also can through multi hop communication by using relay node, to protect the users, especially edge users’ quality of service. Under the environment of large user amount, high quality video transmission of cellular network needs high bandwidth of the network.. Scalable video coding international standard SVC is the H.264/AVC standard scalable JTC ITU-T (and ISO/IEC,2007). Different from other coding methods, SVC can decode different requirements of video only one time. In multi hop cellular network data transmission, relay node selection is a very important part, selecting the optimal relay node will choose a transmission path, so as to improve the throughput of the system, optimize the network performance.In this paper, we propose a video transmission scheme based on SVC coding in multi hop cellular network, SVC video is layered, and each layer is different. In order to realize the transmission of SVC video, we design the transmission scheme of different priority data in multi hop cellular networks, and then study the transmission scheme of SVC coding video data.Firstly, we study different priority data transmission scheme in multi-hop cellular network. Since packets have different priority, for different priority data transmission, we put forward the Enhanced Hybrid Communication Model (EHCM). Data packets have different requirements for delay. We choose different communication modes for different data. Different transmission schemes are proposed to date in cell and cell edge.On the basis of the research on data transmission of different priority, SVC encoded video data is composed of a large number of frames, each layer of frame also has priority, we study video transmission path in multi hop cellular network, mainly used in mobile video transmission, such as mobile phone terminal. The number of dedicated relay limited, which ability is limited, when the amount of users increase, dedicated relay cannot provide enough forwarding capability, multiple number of mobile relays, has unfixed location, limited battery energy. Considering advantages and disadvantages of mobile relay and dedicated relay,we propose BRAS Transmission Scheme based on relay ability. Due to battery, mobility and other issues of mobile relay, we propose different transmission schemes for different users.The SVC encoded video transmission scheme in a multi hop cellular networks, mobile user’bit rate changes, according to the characteristics of the SVC encoded video, video layers have different priorities.In order to provide high quality video, we propose a Priority-based layer switching(PLS) rate adaptation, which can not only decode different video resolutions, quality and speed layer, but also to optimize the rate distortion of the video quality under bandwidth constraints. In order to reduce the packet loss, we propose a Motion Detection based Adaptive error concealment (MDA).Finally, the proposed scheme is simulated, and the results show that the proposed scheme has better network performance and throughput. |
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