Improving Fairness, Efficiency, and Stability in HTTP-Based Adaptive Video Streaming With FESTIVE
Improving Fairness, Efficiency, and Stability in HTTP-Based Adaptive Video Streaming With FESTIVE
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DOI：
10.1109/tnet.2013.2291681
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发表时间：
2014-02-01
影响因子：
3.7
通讯作者：
Zhang, Hui
中科院分区：
文献类型：
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作者：
Jiang, Junchen;Sekar, Vyas;Zhang, Hui
如今的现代视频播放器依靠码率自适应来应对不断变化的网络状况。过去的测量研究已经发现，当多个码率自适应播放器在公平性、效率和稳定性这三个指标方面共享瓶颈链路时，当今的商业播放器存在一些问题。不幸的是，我们目前对这些影响为何发生以及如何减轻它们的理解非常有限。在本文中，我们对码率自适应提出了一种有原则的理解，并通过一个由三个主要组件（带宽估计、码率选择和块调度）组成的抽象播放器模型来分析几个商业播放器。利用这个框架，我们确定了在HTTP上叠加视频码率自适应所导致的几种不良交互的根本原因。基于这些见解，我们开发了一套技术，能够系统地指导在稳定性、公平性和效率之间进行权衡，从而形成一个用于稳健视频自适应的通用框架。我们从这个设计空间中选取了一个具体实例，并表明在一系列实验场景中，它在所有三个关键指标上都显著优于当今的商业播放器。
Modern video players today rely on bit-rate adaptation in order to respond to changing network conditions. Past measurement studies have identified issues with today's commercial players when multiple bit-rate-adaptive players share a bottleneck link with respect to three metrics: fairness, efficiency, and stability. Unfortunately, our current understanding of why these effects occur and how they can be mitigated is quite limited. In this paper, we present a principled understanding of bit-rate adaptation and analyze several commercial players through the lens of an abstract player model consisting of three main components: bandwidth estimation, bit-rate selection, and chunk scheduling. Using framework, we identify the root causes of several undesirable interactions that arise as a consequence of overlaying the video bit-rate adaptation over HTTP. Building on these insights, we develop a suite of techniques that can systematically guide the tradeoffs between stability, fairness, and efficiency and thus lead to a general framework for robust video adaptation. We pick one concrete instance from this design space and show that it significantly outperforms today's commercial players on all three key metrics across a range of experimental scenarios.