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Improving stream control transmission protocol performance over lossy links

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3 Author(s)
Guanhua Ye ; Dept. of Electr. Eng., City Univ. of New York, NY, USA ; Saadawi, T.N. ; Myung Jong Lee

The current stream control transmission protocol (SCTP) does not work well over lossy links. To make SCTP congestion control algorithms robust in lossy networks, the paper first introduces a fine-tuned explicit congestion notification (ECN) mechanism for SCTP in such environment, and then discusses the ECN-D SCTP that can differentiate noncongestion losses from congestion losses. We identify the optimal value of the congestion window for an SCTP source in response to ECN messages in order to maximize the throughput and maintain relatively small end-to-end delay. A simple and practical method to achieve the optimal value is developed by carefully choosing the threshold of queues that support ECN. Because the total goodput performance of SCTP associations is not sensitive to window reduction policies when the network load is heavy, and because fine-tuning SCTP or transmission control protocols congestion window in response to congestion indications using complicated methods may not be worth the increase in complexity of the protocol, the simplified method becomes attractive in achieving the optimal congestion window.

Published in:

Selected Areas in Communications, IEEE Journal on  (Volume:22 ,  Issue: 4 )

Date of Publication:

May 2004

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