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定量分析了FAST/RED系统在平衡态时链路队列长度、系统稳定性与RED控制器参数关系.针对FAST协议发现链路丢包就会采用激进的窗口减半策略造成网络不稳定的缺陷,根据稳定性分析提出一种充分利用源端能够获得的排队时延和丢包频率的历史变化信息,协同合作探测网络的拥塞状况,改进FAST协议源端窗口调整策略,从而间接修改RED控制器参数,提高了系统的稳定性.NS-2仿真验证了稳定性理论分析的准确性和改进策略的有效性.
Quantitative analysis of the FAST / RED system in the equilibrium state of the link queue length, the system stability and the RED controller parameters.FAST agreement found that the link packet loss will use the radical half-window strategy to cause network instability defects, According to the stability analysis, this paper proposes a way to make full use of the historical change information of the queuing delay and packet loss frequency which can be obtained at the source end, to cooperate to detect the congestion status of the network, improve the source end window adjustment strategy of FAST protocol and indirectly modify the RED controller parameters , Which improves the stability of the system.NS-2 simulation verifies the accuracy of the theoretical analysis of stability and the effectiveness of the improved strategy.