Stable accurate rapid bandwidth estimate for improving TCP over wireless networks

Authors:
Le Tuan Anh;Choong Seon Hong
Affiliations:
Computer Engineering Department, Kyung Hee Univerity, Gyeonggi, Korea;Computer Engineering Department, Kyung Hee Univerity, Gyeonggi, Korea
Venue:
ICN'05 Proceedings of the 4th international conference on Networking - Volume Part II
Year:
2005

Citing 4
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Abstract

This paper presents a stable accurate rapid bandwidth estimate (SARBE) algorithm to improve TCP performance over wireless networks. The proposed algorithm estimates the bandwidth sample of the forward path of connection by monitoring the sending time intervals of ACKs. By using the stability-based filter, the current bandwidth samples are eliminated from transient changes, while keeping reasonably persistent changes in the absence of noise. TCP congestion control then uses the estimated bandwidth to properly set the slow start threshold (ssthresh) and congestion window size (cwnd) rather than halving the current value of the cwnd as in TCP after fast retransmit. In the wireless environment, SARBE achieves robustness in aspect of stability, accuracy and rapidity of the estimate, and better performance compared with TCP Reno, Westwood and DynaPara. Furthermore, SARBE is fair in bottleneck sharing and friendly to existing TCP versions, and also tolerates ACK compression in the backward path.