Optimizing quality of experience of dynamic video streaming over fading wireless networks
Optimizing quality of experience of dynamic video streaming over fading wireless networks
复制标题
优化衰落无线网络上动态视频流的体验质量
DOI：
10.1109/cdc.2015.7403354
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
P. Kumar
中科院分区：
文献类型：
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作者：
Rahul Singh;P. Kumar
我们解决了通过共享无线通道从接入点 (AP) 到多个客户端的视频流数据包的衰落问题。在此类系统中，每个客户端都维护一个用于播放视频的数据包缓冲区，只要缓冲区为空，流就会发生中断。客户端可以切换到较低质量的视频数据包，或请求以较高能量级别传输数据包，以最大程度地减少中断次数、中断周期数以及流式传输的低质量视频数据包的数量，同时 AP 上有平均功率限制。我们提出了选择视频质量和传输功率的问题作为约束马尔可夫决策过程（CMDP）。我们表明，涉及 N 个客户端的问题分解为 N 个 MDP，每个 MDP 仅涉及一个客户端，此外，最优策略具有阈值结构，其中选择视频质量和传输功率级别的决策仅取决于缓冲区级别。
We address the problem of video streaming packets from an Access Point (AP) to multiple clients over a shared wireless channel with fading. In such systems, each client maintains a buffer of packets from which to play the video, and an outage occurs in the streaming whenever the buffer is empty. Clients can switch to a lower-quality of video packet, or request packet transmission at a higher energy level in order to minimize the number of outages plus the number of outage periods and the number of low quality video packets streamed, while there is an average power constraint on the AP. We pose the problem of choosing the video quality and transmission power as a Constrained Markov Decision Process (CMDP). We show that the problem involving N clients decomposes into N MDPs, each involving only a single client, and furthermore that the optimal policy has a threshold structure, in which the decision to choose the video-quality and power-level of transmission depends solely on the buffer-level.