Enhanced TCP westwood algorithm based on loss differentiation over GEO satellite networks
Qiaoyan Kang · Journal of Computer Applications · 2008
The advantages and disadvantages of TCP Westwood(TCPW) algorithm were analyzed, especially when it was used in Geostationary Earth Orbit(GEO) satellite networks.In order to solve the existing problems,a new improved TCPW(TCPW-N) algorithm considering loss differentiation was proposed.TCPW-N algorithm took full advantage of Vegas,Veno and the existing improved TCPW algorithm(namely LogWestwood+),and TCPW-N was suitable for GEO satellite networks.TCPW-N algorithm can judge the packet loss reason,and adjust the congestion window according to the different packet loss reasons and the estimated network bandwidth.Performance analysis and simulation results show that TCPW-N algorithm has effectively resolved the existing problems of TCPW.Compared with TCPW and its other improved algorithm,TCPW-N algorithm has better throughput performance,lower packet loss rate,and better fairness and friendliness when applied to GEO satellite networks.