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TCP/IP performance over 3G wireless links with rate and delay variation

机译:3G无线链路上的TCP / IP性能以及速率和延迟变化

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Wireless link losses result in poor TCP throughput since losses are perceived as congestion by TCP, resulting in source throttling. In order to mitigate this effect, 3G wireless link designers have augmented their system with extensive local retransmission mechanisms. In addition, in order to increase throughput, intelligent channel state based scheduling have also been introduced. While these mechanisms have reduced the impact of losses on TCP throughput and improved the channel utilization, these gains have come at the expense of increased delay and rate variability. In this paper, we comprehensively evaluate the impact of variable rate and variable delay on long-lived TCP performance. We propose a model to explain and predict TCP's throughput over a link with variable rate and/or delay. We also propose a network-based solution called Ack Regulator that mitigates the effect of variable rate and/or delay without significantly increasing the round trip time, while improving TCP performanceby up to 40%.
机译:无线链路丢失会导致TCP吞吐量降低,因为TCP会将丢失视为拥塞,从而导致源节流。为了减轻这种影响,3G无线链路设计人员通过广泛的本地重传机制扩展了他们的系统。另外,为了增加吞吐量,还引入了基于智能信道状态的调度。尽管这些机制减少了损耗对TCP吞吐量的影响并提高了信道利用率,但这些收益是以增加的延迟和速率可变性为代价的。在本文中,我们全面评估了可变速率和可变延迟对长期TCP性能的影响。我们提出一个模型来解释和预测具有可变速率和/或延迟的链路上TCP的吞吐量。我们还提出了一种基于网络的解决方案,称为 Ack调节器,该解决方案在不显着增加往返时间的情况下减轻了可变速率和/或延迟的影响,同时将TCP性能提高了40%。

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