Impact of Network Dynamics on User's Video Quality: Analytical Framework and QoS Provision
Impact of Network Dynamics on User's Video Quality: Analytical Framework and QoS Provision
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DOI：
10.1109/tmm.2009.2036294
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发表时间：
2010
影响因子：
7.3
通讯作者：
T. Luan;L. Cai;Xuemin Shen
中科院分区：
文献类型：
--
作者：
T. Luan;L. Cai;Xuemin Shen
我们开发了一个分析框架来研究网络动态对用户感知视频质量的影响。我们的调查站在终端用户的角度，通过分析接收器播放缓冲区。具体地说，我们在接收端分别用G/G/1/n和G/G/1/N队列对回放缓冲区进行建模，其中数据包的到达和回放模式是任意的。然后，我们研究的瞬态队列长度的缓冲区使用扩散近似。我们得到了视频质量在启动延迟、视频播放流畅性和丢包方面的封闭形式表达式，并将其表示为网络统计量，即，平均网络吞吐量和延迟抖动。基于分析框架，我们提出了自适应播放缓冲区管理方案，以最佳的管理阈值的视频播放对最大的用户效用，根据不同的服务质量的最终用户的要求。所提出的框架进行了验证，通过广泛的模拟。
We develop an analytical framework to investigate the impacts of network dynamics on the user perceived video quality. Our investigation stands from the end user's perspective by analyzing the receiver playout buffer. In specific, we model the playback buffer at the receiver by a G/G/1/¿ and G/G/1/N queue, respectively, with arbitrary patterns of packet arrival and playback. We then examine the transient queue length of the buffer using the diffusion approximation. We obtain the closed-form expressions of the video quality in terms of the start-up delay, fluency of video playback and packet loss, and represent them by the network statistics, i.e., the average network throughput and delay jitter. Based on the analytical framework, we propose adaptive playout buffer management schemes to optimally manage the threshold of video playback towards the maximal user utility, according to different quality-of-service requirements of end users. The proposed framework is validated by extensive simulations.