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FAST TCP Congestion Control Algorithm Research and Improvement

Author: NiuHuangCheng
Tutor: ZhaoZiXiang
School: Dalian Maritime University
Course: Computer Science and Technology
Keywords: Congestion Control FAST TCP algorithm Fairness Convergence
CLC: TP393.06
Type: Master's thesis
Year: 2011
Downloads: 58
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Abstract


The rapid development of computer network technology , high - bandwidth long delay networks began to emerge. Efficient information technology and the popularity of high-speed networks are increasingly penetrate into the broader field of study . Some applications , such as scientific collaboration, remote medical diagnosis, through high-speed networks to disseminate real-time data from remote sensors , and the addition of new services such as high-definition signal , cloud computing, networking , and other proposed requires the support of more high-speed network . For high - speed network congestion control research is in the initial stages , there have been some representative algorithms , such as HSTCP , STCP , BICTCP , FAST TCP , etc. . These new algorithms through the reduction mechanisms to adjust the increase of the congestion window , to largely improve the performance of the network . The FAST algorithm based on link delay estimation has some advantages compared with other algorithms , but there are still some performance deficiencies . This paper analyzes the traditional congestion control algorithm for TCP Reno, briefly introduced several high-speed network congestion control algorithm and its evaluation criteria . Through both theoretical and experimental simulation system to study the FAST congestion control algorithm , point out the deficiencies of the the FAST algorithms in fairness convergence . FAST overestimate the propagation delay RTT unfair result , the number of flow through the the estimation network in data herein and the current network bandwidth data link overvalued propagation delay , and then eliminate the overestimated the propagation delay of the error, the corrected data stream , so that the data flow in the link to achieve fair . For the convergence problem , by changing the method of adjustment slow start threshold , eliminating the impact of changes in the network parameters to the network convergence and overshoot , to shorten the convergence time and reduced overshoot . NS2 simulation environment , respectively before and after the improvement of FAST algorithm to simulate the results of the analysis also showed that the improved algorithm can improve the fairness of the link and shorten the convergence time .

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