REFWA Plus: Enhancement of REFWA to combat link errors in LEO satellite networks

Tank Taleb, Nei Kato, Yoshiaki Nemoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

As a distinguished characteristic of satellite environments, high bit error rates (BER) impair the performance of the Transmission Control Protocol (TCP) over satellite networks. In this paper, an error recovery mechanism is proposed to further improve the performance of the Recursive, Explicit, and Fair Window Adjustment (REFWA) scheme [1] [2] in satellite IP networks. The proposed mechanism is called REFWA Plus. The fundamental challenge in loss recovery over satellite networks consists in distinguishing between congestion induced packet drops from those due to link errors. In the proposed mechanism, this distinction is based on comparison of the new and old values of the explicit congestion feedback signaled by the REFWA scheme to TCP senders. Effectively, a packet drop due to network congestion is likely to be preceded by a decrease in the computed feedback, whereas packet drops that are followed by an increased feedback are likely to be due to link errors. A set of simulations is conducted to evaluate the performance of the REFWA Plus scheme. Simulation results demonstrate that compared to TCP Newreno, TCP Westwood, and REFWA, the proposed scheme improves the system fairness and makes better utilization of the bottleneck link even in environments with high bit error rates.

Original languageEnglish
Title of host publication2005 Workshop on High Performance Switching and Routing, HPSR 2005
Pages172-176
Number of pages5
Publication statusPublished - 2005 Nov 15
Event2005 Workshop on High Performance Switching and Routing, HPSR 2005 - Hong Kong, China
Duration: 2005 May 122005 May 14

Other

Other2005 Workshop on High Performance Switching and Routing, HPSR 2005
Country/TerritoryChina
CityHong Kong
Period05/5/1205/5/14

ASJC Scopus subject areas

  • Engineering(all)

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