Congestion-aware MAC layer adaptation to improve video teleconferencing over wi-fi

Wei Chen, Liangping Ma, Chien-Chung Shen
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引用次数: 4

Abstract

In wireless networks such as those based on IEEE 802.11, packet losses due to fading and interference are often misinterpreted as indications of congestion, causing unnecessary decrease in the data sending rate due to congestion control at higher layer protocols. For delay-constrained applications such as video teleconferencing, packet losses may result in excessive artifacts or freeze in the decoded video. We propose a simple and yet effective mechanism to detect and reduce channel-caused packet losses by adjusting the retry limit parameter of the IEEE 802.11 protocol. Since retry limit is left configurable in the IEEE 802.11 standard, and does not require cross-layer coordination, our scheme can be easily implemented and incrementally deployed. Experimental results of applying the proposed scheme to a WebRTC-based realtime video communication prototype show significant performance gain compared to the case where retry limit is configured statically.
拥塞感知MAC层适应,以改善wi-fi上的视频电话会议
在诸如基于IEEE 802.11的无线网络中,由于衰落和干扰造成的数据包丢失经常被误解为拥塞的迹象,由于在更高层协议中进行拥塞控制,导致数据发送速率不必要的降低。对于延迟受限的应用,如视频电话会议,丢包可能导致解码视频中出现过多的伪影或冻结。我们提出了一种简单而有效的机制,通过调整IEEE 802.11协议的重试限制参数来检测和减少信道导致的数据包丢失。由于重试限制在IEEE 802.11标准中是可配置的,并且不需要跨层协调,因此我们的方案可以很容易地实现和增量部署。将该方案应用于基于webbrtc的实时视频通信原型的实验结果表明,与静态配置重试限制的情况相比,该方案的性能有显著提高。
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