Considering the instability of data transferred existing in high speed network, a new method is proposed for improving the stability using control theory. Under this method, the mathematical model of such a network is...Considering the instability of data transferred existing in high speed network, a new method is proposed for improving the stability using control theory. Under this method, the mathematical model of such a network is established. Stability condition is derived from the mathematical model. Several simulation experiments are performed. The results show that the method can increase the stability of data transferred in terms of the congestion window, queue size, and sending rate of the source.展开更多
FAST TCP是面向未来高带宽延迟积网络提出的新一代传输控制协议.在不同的网络环境中分析其稳定性是目前研究的热点之一.建立了单链路多源网络中,FAST TCP和路由器组成的闭环系统的非线性、延迟微分方程模型.根据模型得到系统的平衡点,...FAST TCP是面向未来高带宽延迟积网络提出的新一代传输控制协议.在不同的网络环境中分析其稳定性是目前研究的热点之一.建立了单链路多源网络中,FAST TCP和路由器组成的闭环系统的非线性、延迟微分方程模型.根据模型得到系统的平衡点,在平衡点附近将非线性模型进行线性化,采用现代控制理论方法证明了系统局部稳定的充分条件,解除了稳定性条件与网络参数之间的耦合.大量的仿真实验验证了稳定性结论的正确性.展开更多
The limits of parameter γ in FAST TCP are studied in this paper. A continuous time fluid flow model of the link buffer is considered to create a linear control system related to FAST TCP. Linearing the fluid flow mod...The limits of parameter γ in FAST TCP are studied in this paper. A continuous time fluid flow model of the link buffer is considered to create a linear control system related to FAST TCP. Linearing the fluid flow model and window control model, the Laplace transform version of congestion control system are presented. It results in a negative feedback system with open loop transfer function. With the analysis of Nyquist curve of the system, a sufficient condition on asymptotical stability of FAST TCP congestion window related to the parameter γ is obtained. Packet level ns-2 simulations are used to verify the theoretical claims.展开更多
基金the National Natural Science Foundation of China (50579022 50539140).
文摘Considering the instability of data transferred existing in high speed network, a new method is proposed for improving the stability using control theory. Under this method, the mathematical model of such a network is established. Stability condition is derived from the mathematical model. Several simulation experiments are performed. The results show that the method can increase the stability of data transferred in terms of the congestion window, queue size, and sending rate of the source.
基金Supported by National High-Tech Research and Development Plan (863) of China (No. 2006AA01Z232, No.2009AA01Z212, No. 200901Z202)Natural Science Foundation of Jiangsu Province (No. BK2007603)High-Tech Research Plan of Jiangsu Province (No.BG2007045)
文摘The limits of parameter γ in FAST TCP are studied in this paper. A continuous time fluid flow model of the link buffer is considered to create a linear control system related to FAST TCP. Linearing the fluid flow model and window control model, the Laplace transform version of congestion control system are presented. It results in a negative feedback system with open loop transfer function. With the analysis of Nyquist curve of the system, a sufficient condition on asymptotical stability of FAST TCP congestion window related to the parameter γ is obtained. Packet level ns-2 simulations are used to verify the theoretical claims.
