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摘要:
Transmission Control Protocol (TCP) performance over MANET is an area of extensive research. Congestion control mechanisms are major components of TCP which affect its performance. The improvement of these mechanisms represents a big challenge especially over wireless environments. Additive Increase Multiplicative Decrease (AIMD) mechanisms control the amount of increment and decrement of the transmission rate as a response to changes in the level of contention on routers buffer space and links bandwidth. The role of an AIMD mechanism in transmitting the proper amount of data is not easy, especially over MANET. This is because MANET has a very dynamic topology and high bit error rate wireless links that cause packet loss. Such a loss could be misinterpreted as severe congestion by the transmitting TCP node. This leads to unnecessary sharp reduction in the transmission rate which could degrades TCP throughput. This paper introduces a new AIMD algorithm that takes the number of already received duplicated ACK, when a timeout takes place, into account in deciding the amount of multiplicative decrease. Specifically, it decides the point from which Slow-start mechanism should begin its recovery of the congestion window size. The new AIMD algorithm has been developed as a new TCP variant which we call TCP Karak. The aim of TCP Karak is to be more adaptive to mobile wireless networks conditions by being able to distinguish between loss due to severe congestion and that due to link breakages or bit errors. Several simulated experiments have been conducted to evaluate TCP Karak and compare its performance with TCP NewReno. Results have shown that TCP Karak is able to achieve higher throughput and goodput than TCP NewReno under various mobility speeds, traffic loads, and bit error rates.
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篇名 TCP Karak: A New TCP AIMD Algorithm Based on Duplicated Acknowledgements for MANET
来源期刊 通讯、网络与系统学国际期刊(英文) 学科 医学
关键词 TCP CONGESTION Control Additive Increase MULTIPLICATIVE DECREASE Mobile Ad Hoc Networks Duplicated ACKNOWLEDGEMENT
年,卷(期) 2014,(9) 所属期刊栏目
研究方向 页码范围 396-407
页数 12页 分类号 R73
字数 语种
DOI
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TCP
CONGESTION
Control
Additive
Increase
MULTIPLICATIVE
DECREASE
Mobile
Ad
Hoc
Networks
Duplicated
ACKNOWLEDGEMENT
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研究分支
研究去脉
引文网络交叉学科
相关学者/机构
期刊影响力
通讯、网络与系统学国际期刊(英文)
月刊
1913-3715
武汉市江夏区汤逊湖北路38号光谷总部空间
出版文献量(篇)
763
总下载数(次)
1
总被引数(次)
0
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