The design analysis and implementation of a novel TCP congestion control scheme / Wei Xu.

Abstract

This thesis presents the design, analysis and implementation aspects of a new Transmission Control Protocol (TCP) congestion control scheme. To overcome the shortfalls associated with existing TCP congestion control schemes, which are heuristic based, a novel self-tuning proportional and derivative control based TCP (ST-PD TCP) congestion control system is proposed, which approaches the congestion control problem from a control-theoretic perspective where the TCP congestion window is adjusted by a classic PD controller aiming to keep the buffer occupancy of the bottleneck node on the connection path at an ideal operating level. The control gains of the PD controller are tuned on-line by a fuzzy logic controller based on the perceived bandwidth-delay product of the TCP connection.