基于主动管理的高速网络拥塞系统稳定性分析

Analysis on Stability of High-speed Network Congestion System Based on Active Management

当发送端采用FAST TCP主动拥塞控制、链路路由端采用随机早期检测算法(RED)主动队列管理算法时,网络系统出现了不稳定情况。在原有FAST TCP协议主动控制模型基础上,添加了分组丢失时窗口减半的控制策略,建立了考虑分组丢失情况下的主动管理FAST TCP/RED拥塞控制模型,仿真验证了该模型的有效性。应用Routh判据对该系统进行稳定性分析,得到系统稳定时RED参数设置范围。NS-2仿真验证理论分析的有效性。

When the sender runs FAST TCP protocol and the link AQM strategy is RED,the FAST TCP/RED system appears instability sometimes.The strategy that the window size is halved once the packet is detected to be lost is appended to the FAST window control algorithm.Considering the droped packet,a new congestion control model of FAST TCP/RED system is created,and the simulation verifies this new model.Routh stability criterion is used to analysis the FAST TCP/RED system,and then we receive RED parameters setting scope about the asymptotic stability of this system.The NS-2 simulations validate the effectiveness of the theoretical analysis.