A time-based adaptive retry strategy for video streaming in 802.11 WLANs
A time-based adaptive retry strategy for video streaming in 802.11 WLANs
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DOI：
10.1002/wcm.473
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发表时间：
2007-02
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通讯作者：
Mei-Hsuan Lu;P. Steenkiste;Tsuhan Chen
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文献类型：
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作者：
Mei-Hsuan Lu;P. Steenkiste;Tsuhan Chen
时变、易出错的无线局域网（WLAN）上的视频流带来了许多挑战。一个问题是WLAN的设计没有意识到应用数据的特性，这导致在嘈杂或拥塞的环境中性能下降。在本文中，我们提出了一个基于时间的自适应重试（TAR）机制的MPEG类视频流在802.11无线网络。TAR根据数据包的重传期限动态地确定是发送还是丢弃数据包，而不是在所有数据包上统一采用静态重试限制。我们的方法可以适应每个单独的数据包的重试限制，从而提供不同类型的视频帧的间接不平等的错误保护。理论分析和仿真结果表明，TAR能显著提高视频质量，节省信道带宽。我们还描述了一个初步的基于软件的TAR实现，并使用它来证明所提出的方法的实用性。版权所有© 2007约翰威利父子有限公司。
Video streaming over time-varying, error-prone wireless LANs (WLANs) poses many challenges. One problem is that WLANs are designed without awareness of the characteristics of application data, which causes performance degradation in a noisy or congested environment. In this paper, we propose a time-based adaptive retry (TAR) mechanism for MPEG-like video streaming over 802.11 wireless networks. TAR dynamically determines whether to send or discard a packet based on its retransmission deadline instead of adopting a static retry limit uniformly over all the packets. Our approach can adapt the retry limit for each individual packet, thus providing indirect unequal error protection over different types of video frames. Analytical and simulation results show that TAR significantly improves video quality and saves channel bandwidth. We also describe a preliminary software-based implementation of TAR and use it to demonstrate the practicality of the proposed approach. Copyright © 2007 John Wiley & Sons, Ltd.