为在车联网中实现高可靠性、低时延、高速率视频分发, 面向设备与设备通信提出一种基于随机线性网络编码 (RLNC) 的视频分发方案.源节点将要分发的视频文件通过RLNC进行分片编码, 编码后的数据片分发给道路上的移动设备.每个移动设备接收到数据片后, 经过再编码向其他设备分发.当设备在接收到一定数量的线性无关的数据后, 对数据片进行解码得到原始数据.设计模式切换、无线接入点选择、主动式再编码3种策略减少视频分发的延迟.实验结果表明, 与传统基于复制的传输方案和基于即时可解的网络编码传输方案相比, 该方案具有更高的分发效率.%To implement high-reliable, low-delay, and high-rate video distribution in Internet of vehicles, this paper proposes a video distribution scheme based on Random Linear Network Coding (RLNC) for Device-to-Device (D2D) communications. The source node equally splits the video file into multiple segments, and encodes the data segments with RLNC. Each mobile device receives a data segment from the source node, and distributes data segments to other devices after re-encoding. When the device receives a fixed number of linearly independent data segments, it decode data segments to gain the original data. In order to reduce the delay of data distribution, this paper designs three strategies including mode switching, Access Point (AP) selection, and active re-encoding. Experimental results show that compared to the traditional replication-based transmission scheme and the transmission scheme based on Instantly Decodable Network Coding (IDNC), the proposed scheme has higher distribution efficiency.
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