用户体验可感知的软件定义移动流媒体分发理论与算法研究

移动流媒体是移动互联网时代的关键应用，但是由于缺乏对底层网络的控制，现有内容分发系统很难快速准确地感知移动流媒体用户的体验，并从根本上保障用户体验质量。本课题提出一种用户体验可感知的软件定义自适应移动流媒体分发机制，利用底层软件定义网络的开放性和可编程性，根据感知的用户体验质量，针对移动流媒体应用特征对网络资源进行优化配置，从而真正实现对用户体验质量的保障。预期该课题的实施将在移动流媒体用户体验特征分析和评价、移动流媒体系统性能分析、基于SDN的分布式流媒体分发体系结构、保障用户体验公平性的网络资源共享机制、针对移动流媒体传输的分布式优化等方面取得理论、方法和技术上的创新。同时，本课题将会开发原型系统和开放协议，对研究成果进行验证，从而优化移动流媒体分发的整体性能，为建设新一代高用户体验质量的移动流媒体分发系统奠定基础。

Mobile video streaming is a killer application in the era of the mobile Internet. However, due to the lack of control over the underlying network, it is difficult for content distribution systems to perceive the quality of user experience accurately and timely. Therefore, it is hard to guarantee the quality of user experience fundamentally. This project proposes a QoE-aware adaptive mobile video streaming mechanism based on software-defined networks. By exploiting the openness and programmability of SDN, we can optimize network resource provisioning based on the perceived quality of user experience. It is expected that this project can achieve significant innovations on both theories and methodologies in the following aspects, such as analysis and evaluation of mobile video QoE, performance evaluation of mobile video streaming systems, distributed SDN-based media streaming system architecture, QoE-fair network resource allocation mechanism, distributed optimization of mobile video transmission, and so on. In the meanwhile, we will also develop a prototype system and open protocols, and verify the correctness of our results, so as to optimize the overall performance of mobile video streaming. This project will lay the foundation for the next-generation QoE-aware mobile video streaming systems.