基于高层模糊变结构控制的主动队列管理算法

AQM Algorithm Based on Higher-order Fuzzy Variable Structure Control

从控制论的角度出发,主动队列管理算法将IP层纳入到拥塞控制机制。该文根据TCP拥塞控制机制的线性化模型,利用线性化模型时延因子的多项式表达式,提出了基于高层模糊变结构控制主动队列管理算法,简化了控制器的设计。NS仿真结果显示本算法提高了拥塞控制的性能和鲁棒性,有效地补偿了时延因子对于控制性能的影响。

From the viewpoint of control theory, it has been shown that the TCP connections through the congested routers can be modeled as a feedback dynamic system and AQM algorithm bring IP layer to the mechanism of congestion control. According to the linear model, this paper put forward AQM algorithms based on higher-order fuzzy variable structure control through utilizing the polynomial expression of delay-equation in the linear model. NS-simulation shows that the proposed design significantly outperforms the peer AQM schemes in terms of packet loss ratio, throughput and buffer fluctuation, and enhances the robustness with respect to the uncertainties of the round-trip time （RTT） and the number of active TCP sessions.