Effects of mismatched Smith controller on stability in systems with time-delay
Automatica (Journal of IFAC)
Congestion avoidance and control
SIGCOMM '88 Symposium proceedings on Communications architectures and protocols
Dynamic behavior of slowly-responsive congestion control algorithms
Proceedings of the 2001 conference on Applications, technologies, architectures, and protocols for computer communications
Brief paper: On delay-derivative-dependent stability of systems with fast-varying delays
Automatica (Journal of IFAC)
Physically Based Collaborative Simulations under Ring-Like Network Configurations
IEEE Computer Graphics and Applications
Motion synchronization control of distributed multisubsystems with invariant local natural dynamics
IEEE Transactions on Robotics
New methods for passive estimation of TCP round-trip times
PAM'05 Proceedings of the 6th international conference on Passive and Active Network Measurement
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Congestion control is a fundamental building block in packet switching networks such as the Internet due to the fact that communication resources are shared. It has been shown that the plant dynamics is essentially made up of an integrator plus time delay and that a proportional controller plus a Smith predictor defines a simple and effective controller. It has also been shown that the TCP congestion control can be modelled using a Smith predictor plus a proportional controller. Due to the importance of this control structure in the field of data network congestion control, we analyse the robust stability of the closed-loop system in the face of delay uncertainties that are present in data networks due to queuing. In particular, by applying a geometric approach, we derive a bound on the proportional controller gain which is necessary and sufficient to guarantee the closed-loop stability for a given bound on the delay uncertainty.