In this paper, we make use of the distributed utility-based congestion controller to study the stabilization problem under a general network topology. The network allows multiple users to simultaneously share the limited availability of network resources and to control their transmission rates by delayed feedback signals. We establish a sufficient condition for global stability for the controlled network with delays in both data paths and control paths. This condition for testing global stability is very simple and does not need the assumptions that the congestion marking function is differentiable and converges to an equilibrium point.

We have designed a proportional and integral rate (PIR) controller based on the continuous-time fluid flow control theory to solve both of the traffic control performance problems observed in RED, i.e. the unnecessary packet loss and the queue size oscillation in the router. We prove the controller's stability by the Second Method of Lyapunov's Stability Theorem and provide an implementation method. Our simulation results demonstrated that the PIR controller outperforms other common traffic and congestion control schemes significantly.

In this paper, we developed a proportional rate control for the high-speed data networks subject to varying round-trip delays and packet loss. Given that data can be lost and round-trip delays can be varied, we showed that the proposed rate control could stabilize the network and overcome the oscillation problem that exists in most of current existing traffic controllers. It is also shown that the proposed rate control is not sensitive to the packet loss and achieves the fairness.

We propose an approach to design a distributed rate-based traffic controller to flow-regulate the best-effort service (e.g., ABR) traffic and guaranteed service traffic through a high-speed switch. The controller is distributed among the source nodes and has a very simple structure. Its local controller at each source node is open-loop stable and only requires the knowledge of the queue length at the bottleneck switch. We show that the proposed controller is fair and can stabilize the network with long variable delays. This controller does not have oscillation and can achieve high utilization.

We propose an approach to design a rate-based proportional traffic controller in order to flow-regulate the best-effort service (e.g., ABR traffic) and guaranteed service traffic through an ATM switch. The controller is distributed and it has a very simple structure. Its local controller at each source node is open-loop stable and only requires the knowledge of the buffer occupancy at the bottleneck switch. We show that this controller is fair and is not sensitive to the change of virtual connections (VCs) over time. It does not have oscillations and can achieve a high utilization.