Research on Network Coding to Optimize Performance of TCP in Wireless Networks

Abstract

Abstract: The emergence of network coding provides a new method for improving TCP performance in wireless network.J.K.Sundararajan et al.proposed a new protocol called TCP/NC based on network coding combining the network coding and transmission control protocol,which achieves remarkable results in improving the performance of TCP in wireless network.But the synchronism problem in data transmission and decoding operation may seriously affect the performance of TCP/NC and its modified protocol is not considered.To address this issue,a revised protocol TCP/NCW was proposed in this paper.We introduced the decoding window adjustment scheme based on TCP/NC.In TCP/NCW,the decoding window is adjusted according to the decoding time and will finally reach an optimal window size.This scheme can ensure the synchronization of data transfer and decoding operation.Therefore,this scheme can achieve better performance.We used the queuing theory to analyze the existence of the optimal decoding window of TCP/NCW.The simulation results with NS2 show that TCP/NCW achieves significant improvement in throughput compared with both TCP/Vegas and TCP/NC in different scenarios,without prejudice of fairness.

Key words: Wireless ad hoc network,Network coding,TCP/NC,Optimal window

GE Wei-min, XU Wen-qing, ZHU Hai-ying, LI Juan and RAN Fang. Research on Network Coding to Optimize Performance of TCP in Wireless Networks[J].Computer Science, 2015, 42(6): 125-130.

References

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