Improving the robustness of fuzzy logic ATM ABR rate control for large round trip times

For ABR to be a practical part of ATM, its rate must be able to be controlled effectively even in the presence of a large round trip time (RTT). A simple fuzzy logic controller was recently shown to perform poorly in networks with large RTTs. This paper compares three methods of improving the robustness of this controller to large RTT. One of these in particular is found to provide significantly lower cell loss for large RTTs, and higher utilisation for very large RTTs