HTTP/2：一种基于代理的自适应视频流公平性保证框架
FAURAS: A Proxy-based Framework for Ensuring the Fairness of Adaptive Video Streaming over HTTP/2 Server Push
摘要：
HTTP/2视频流在过去几年的多媒体技术发展中引起了很多关注。在HTTP/2中，服务器推送机制允许服务器在单个请求中向客户端发送更多的视频片段，以处理请求爆炸问题。因此，最近的研究工作一直集中在利用这样的功能来增强流体验，同时减少请求相关的开销。然而，目前的作品只优化单个客户端的性能，没有必要的关注可能对同一网络中的其他客户端的影响。当多个流媒体客户端在HTTP/1.1中竞争共享带宽时，它们可能会遭受不公平性，这被定义为它们的比特率选择的不平等。对于HTTP/1.1，已有的工作证明了网络辅助解决方案在解决不公平问题上是有效的。然而，尚未研究将这种方法用于HTTP/2服务器推送的可行性。因此，在本文中，提出了一种新的基于代理的框架，以克服不公平的问题，在HTTP/2的自适应流与服务器推。实验结果证实了该框架在保证公平性、帮助客户端避免重缓冲事件和降低比特率下降幅度方面的优越性，同时保持了服务器推送功能的机制。
英文摘要：
HTTP/2 video streaming has caught a lot of attentions in the development of multimedia technologies over the last few years. In HTTP/2, the server push mechanism allows the server to deliver more video segments to the client within a single request in order to deal with the requests explosion problem. As a result, recent research efforts have been focusing on utilizing such a feature to enhance the streaming experience while reducing the request-related overhead. However, current works only optimize the performance of a single client, without necessary concerns of possible influences on other clients in the same network. When multiple streaming clients compete for a shared bandwidth in HTTP/1.1, they are likely to suffer from unfairness, which is defined as the inequality in their bitrate selections. For HTTP/1.1, existing works have proven that the network-assisted solutions are effective in solving the unfairness problem. However, the feasibility of utilizing such an approach for the HTTP/2 server push has not been investigated. Therefore, in this paper, a novel proxy-based framework is proposed to overcome the unfairness problem in adaptive streaming over HTTP/2 with the server push. Experimental results confirm the outperformance of the proposed framework in ensuring the fairness, assisting the clients to avoid rebuffering events and lower bitrate degradation amplitude, while maintaining the mechanism of the server push feature.
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