document: Novel TCP congestion control scheme and its performance evaluation A novel self-tuning proportional and derivative -LRB- ST-PD -RRB- control based TCP congestion control scheme is proposed . The new scheme approaches the congestion control problem from a control-theoretical perspective and overcomes several Important limitations associated with existing TCP congestion control schemes , which are heuristic based . In the proposed scheme , a PD controller is employed to keep the buffer occupancy of the bottleneck node on the connection path at an ideal operating level , and it adjusts the TCP window accordingly . The control gains of the PD controller are tuned online by a fuzzy logic controller based on the perceived bandwidth-delay product of the TCP connection . This scheme gives ST-PD TCP several advantages over current TCP implementations . These include rapid response to bandwidth variations , insensitivity to buffer sizes , and significant improvement of TCP throughput over lossy links by decoupling congestion control and error control functions of TCP
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