Study Further Of TCP Congestion Control Mechanisms Base On Mathematical Model

In the Internet, TCP congestion control mechanism enables end host to adjust its throughput according to the congestion level inside the network. TCP congestion mechanism model reflects the impact of network loss and delay to TCP performance, which increases the understanding of this mechanism and explores the improving possibilities. Based on previous work, this paper further discusses TCP congestion control modeling in the following two areas:.1,Model this mechanism with Semi-Markov Process: Model the TCP congestion window evolution process as Semi-Markov Process. Analyze the steady window distribution of this stochastic process, applying Little's Law to obtain the average throughput of TCP. The model approximates the results of experiment and simulation very well. As an application of this model, this paper analyzed the impact of TCP receiver advertise window size to the average throughput.2,Model this mechanism with fluid model: In TCP fluid models, we use loss time interval to describe network loss process, use stochastic point process to describe the arrivals of loss events, and compare the impact of different loss processes to TCP performance. This paper analyzes a novel point process-Poisson process with its arrival rate dependent with TCP window size. The paper obtained the moments and possibility density distribution of TCP window size. Analysis shows that this loss model and the I.I.D loss model of SMP actually reflect a same network loss process. This equivalence helps us to understand the relationship between different loss models. Currently we haven't found any similar work.