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Published in:
2015 | OriginalPaper | Chapter
41. An Improved Slow-Start Algorithm Based on Bandwidth Estimation
Authors : Hong Jie, Rui-Qing Wu, Nan Ding
Published in: The Proceedings of the Third International Conference on Communications, Signal Processing, and Systems
Publisher: Springer International Publishing
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Abstract
Aimed at these problems that the transmission rate changes greatly, the slow start threshold (ssthresh) sets statically and the abrupt transition causes the multiple packets losses from a window of data and retransmission timeouts on the stage of slow-start of TCP congestion, this paper proposes an improved slow-start algorithm called TCPBP, which utilizes a passive end-to-end bandwidth estimation technique to estimate in real time the available bandwidth, then realizes the dynamical updating of ssthresh according to the network status. Furthermore, we adopt a phased approach to adjust the size of the congestion window (cwnd) during slow-start phase. Simulation results show that TCPBP can effectively avoid the phenomenon of multiple packets losses with respect to the traditional TCP and achieve the smooth access and the transition to congestion avoidance stage, which improve the performance of network, increase the bandwidth utilization and throughput, and lower the packet loss rate.