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UBC Theses and Dissertations

A window-based synchronous scheme for network congestion control/avoidance Liang, Yonghua


Congestion control and/or avoidance in computer networks has attracted a great deal of attentions in the last several years. Many schemes have been proposed. Each has its own advantages and disadvantages. For example, the Slow Start scheme does not consume any additional network resources, but its fairness and throughput are not satisfactory since it does not provide any mechanism to synchronize window adjustments of the sources and does not attempt to prevent packets from being dropped. The DEC Bit scheme does not perform well in two way traffic situations. In this thesis, several representative schemes are reviewed and discussed, and a new synchronous congestion/avoidance scheme with explicit and implicit feedbacks (SEIF) is proposed which would produce high network throughput and good fairness at modest overhead. Performance of these schemes are compared through extensive simulations under a variety of situations. Based on the results of the simulations, the performance of the SEIF scheme is found to be satisfactory in meeting our design requirements.

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