The effects of packet reordering in a wireless multimedia environment

1st International Symposium onWireless Communication Systems, 2004. Pub Date : 2004-09-20 DOI:10.1109/ISWCS.2004.1407288

C. M. Arthur, D. Girma, D. Harle, Andrew Lehane

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引用次数: 10

Abstract

Packet reordering has been shown to be an ever-increasing phenomenon on the Internet and must be taken into account when considering performance analysis of both fixed, wireless and mixed media networks. Previous work (J. Bennet et al., 1999) has demonstrated that TCP suffers degraded performance in situations of high packet reordering. This paper will consider why video traffic over UDP also performs badly in situations of high packet reordering, due to the temporal inter-packet dependencies introduced by the MPEG video encoding structure. Wireless networks are especially prone to problems due to the higher levels of link layer retransmissions found in noisy wireless environments. An experimental investigation into the effects of video packet reordering using the Windows Media streaming system is presented. A method for invoking packet reordering is introduced, and a tool for client-side measurements of video quality is presented. Typical measurements of video performance undergoing reordering are shown, with a study of buffering occupancy at the client, and the potential impact this could have on video packet reordering demonstrated.

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无线多媒体环境中数据包重排序的影响

分组重新排序已被证明是Internet上日益增长的现象，在考虑固定、无线和混合媒体网络的性能分析时必须考虑到这一点。以前的工作(J. Bennet et al.， 1999)已经证明TCP在高数据包重排序的情况下性能会下降。本文将考虑为什么基于UDP的视频流量在高分组重排序的情况下也表现不佳，这是由于MPEG视频编码结构引入的临时包间依赖关系。无线网络特别容易出现问题，因为在嘈杂的无线环境中发现了更高级别的链路层重传。本文对Windows Media流媒体系统下视频包重排序的效果进行了实验研究。介绍了一种调用数据包重排序的方法，并提出了一种客户端视频质量测量工具。本文展示了重新排序过程中视频性能的典型测量结果，并对客户机上的缓冲占用进行了研究，并演示了这可能对视频数据包重新排序产生的潜在影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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1st International Symposium onWireless Communication Systems, 2004.

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