A near-optimal scheme for TCP ACK pacing to maintain throughput in wireless networks

Gitanjali Bhutani
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引用次数: 9

Abstract

The advent of fourth generation technologies in wireless networks and the rapid growth of 3G have heralded an era that will require researchers to find reliable and easily implement-able solutions to the problem of poor TCP performance in the wireless environment. Since a large part of the Internet is TCP-based, solving this problem will be instrumental in determining if the move from wired to wireless will be seamless or not. This paper proposes a scheme that uses the base station's ability to predict the time at which the link may be going down and to estimate the period for which the mobile would be unreachable due to conditions like fading. By using cross-layer and ACK pacing algorithms, the base station prevents the fixed host from timing out while waiting for ACKs from the mobile. This in turn prevents TCP on the fixed host from bringing down the throughput drastically due to temporary network conditions, caused by mobility or the unreliability of wireless links. Experimental results indicate a reasonable increase in throughput when the ACK holding scheme is used.
一种在无线网络中保持吞吐量的近乎最优的TCP ACK调整方案
无线网络中第四代技术的出现和3G的快速增长预示着一个时代的到来,这个时代要求研究人员找到可靠且易于实现的解决方案,以解决无线环境中TCP性能差的问题。由于互联网的很大一部分是基于tcp的,解决这个问题将有助于确定从有线到无线的转变是否无缝。本文提出了一种方案,该方案利用基站的能力来预测链路可能下降的时间,并估计由于衰落等情况而无法到达移动设备的时间。通过使用跨层和ACK调整算法,基站可以防止固定主机在等待移动设备的ACK时超时。这反过来又防止了固定主机上的TCP由于移动性或无线链路的不可靠性引起的临时网络条件而大幅降低吞吐量。实验结果表明,当采用ACK保持方案时,吞吐量有了合理的提高。
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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