Generalized predictive control—Part I. The basic algorithm
Automatica (Journal of IFAC)
Random early detection gateways for congestion avoidance
IEEE/ACM Transactions on Networking (TON)
Fluid-based analysis of a network of AQM routers supporting TCP flows with an application to RED
Proceedings of the conference on Applications, Technologies, Architectures, and Protocols for Computer Communication
Adaptive Control
Design a PID Controller for Active Queue Management
ISCC '03 Proceedings of the Eighth IEEE International Symposium on Computers and Communications
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The network congestion has become increasingly serious. So many active queue management (AQM) algorithms used in routers have been proposed to alleviate network congestion.Generalized predictive control (GPC) is an effective control strategy, which has been widely applied in nonlinear and time-delay systems. This paper mainly analyses the stability of GPC as an AQM algorithm. It educes the discrete model of the network based on the fluid-flow model of TCP congestion window, then elicits the closed loop transfer function of router's output queue length with reference queue length. When the length of predictive region isn't smaller than system total time delay, it gives the characteristic equation of the closed loop system in one-step control. Then conditions of system stabilization are proved with jury criterion, and it gives three theorems about system stability. The validity of theorems is verified by simulation results.