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Modeling and Improving TCP Performance over Cellular Link with Variable Bandwidth

机译:建模和提高带宽可变的蜂窝链路上的TCP性能

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To facilitate a viable evolution of cellular networks toward extensive packet data traffic, the High Speed Downlink Packet Access (HSDPA) technology is introduced. The various link adaptation techniques employed by HSDPA augment the bandwidth variation, which is identified as one of the most important factors resulting in the deterioration of TCP performance. In this paper, we firstly build an analytical model of TCP throughput to explain why the bandwidth variation degrades the TCP performance. Subsequently, a split-connection Window Adaptation TCP Proxy is proposed to improve the TCP throughput in HSDPA networks. To use the precious cellular link resources sufficiently, the length of the queue in Node-B is intentionally kept around the reference value through adaptively adjusting the sending window size of TCP proxy based on the dynamic values of varying bandwidth. Since both the disturbance caused by bandwidth variation and the feedback delay are prone to lead an unstable queue system, the robust sliding mode variable structure control theory is employed to design the proper control law to weaken the impact of noise and delay on the stability of the queue system in Node-B. The theoretical analysis and the enhanced scheme are verified through simulation experiments. The simulation results show that our TCP proxy is able to resist against bandwidth oscillation and improve the cellular link utilization.
机译:为了促进蜂窝网络向大量分组数据业务的可行演进,引入了高速下行链路分组接入(HSDPA)技术。 HSDPA使用的各种链路自适应技术会增加带宽变化,这被认为是导致TCP性能下降的最重要因素之一。在本文中,我们首先建立了TCP吞吐量的分析模型,以解释带宽变化为什么会降低TCP性能。随后,提出了一种分离连接的窗口自适应TCP代理,以提高HSDPA网络中的TCP吞吐量。为了充分利用宝贵的蜂窝链路资源,通过基于可变带宽的动态值自适应地调整TCP代理的发送窗口大小,可以有意地将Node-B中队列的长度保持在参考值附近。由于带宽变化引起的干扰和反馈延迟都容易导致队列系统不稳定,因此采用鲁棒滑模变结构控制理论设计适当的控制律,以减小噪声和延迟对系统稳定性的影响。 Node-B中的队列系统。通过仿真实验验证了理论分析和改进方案。仿真结果表明,我们的TCP代理能够抵抗带宽振荡并提高蜂窝链路利用率。

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