A new TCP end-to-end congestion avoidance algorithm through output feedback

We design end-to-end congestion avoidance algorithm for TCP window dynamics. Instead of using explicit feedback from the router like that in RED, we propose the idea of dynamically estimating the queue size from the noisy throughput acknowledgement, and driving TCP window accordingly. A linear quadratic Gaussian controller is constructed, and stability of the composed system is proved. In this setting, complex functions are placed in the hosts and not inside the network.