Research on Stable Region of PI Active Queue Management in Ad Hoc Network

Proportional Integral(Pl)algorithm in Active Queue Management(AQM)can control the queue size of bottleneck nodes in Ad hoc network effectively,and stability of the algorithm is the base of congestion control.Now the designs of PI-AQM always lack theoretic analysis of stable region.This paper analyzes stability characteristic of PI-AQM in wireless and delay Ad hoc network because of the multi-hop and large-delay, and gives stable regions of PI-AQM controllers in delay and non-delay networks to improve PI controllers.Matlab and NS2 simulations validate the conclusion.

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