Dynamic congestion control to improve performance of TCP split-connections over satellite links

TitleDynamic congestion control to improve performance of TCP split-connections over satellite links
Publication TypeConference Paper
Year of Publication2004
AuthorsWu, L., F. Peng, and V. C. M. Leung
Conference NameComputer Communications and Networks, 2004. ICCCN 2004. Proceedings. 13th International Conference on
Pagination268 -272
Date Publishedoct.
Keywordsbit error rate, dynamic congestion control, dynamic congestion control mechanism, error statistics, feedback, satellite link, satellite links, selective acknowledgment, TCP split-connection, telecommunication channels, telecommunication congestion control, transmission control protocol, transport protocols

Satellites have played an important role in global telecommunications. However, transmission control protocol (TCP) suffers significant performance degradations over satellite links due to high bit error rate and long latency. Among methods proposed to alleviate the impact of satellite link characteristics on TCP performance, split TCP connections separated by performance enhancement proxies have been proven attractive because they can keep TCP configurations in the end systems unchanged. In this paper, we propose a new dynamic congestion control mechanism based on TCP selective acknowledgment (SACK), called dynamic SACK (DSACK), for the satellite segment in a split TCP connection. DSACK obtains immediate congestion feedback from the underlying layer, so as to efficiently prevent congestion and correctly differentiate between packet losses due to channel errors and congestion. Simulation results show that our novel mechanism improves TCP performance over satellite networks significantly, compared to standard TCP versions


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