Performance of TCP Vegas, Bic and Reno Congestion Control Algorithms on Iridium Satellite Constellations

Abstract

Satellite networking is different from wired or wireless networks. The behavior and the performance of TCP/IP in normal wireless network as well as in wired network are different from one another. The TCP/IP protocol was not designed to perform well over high-latency or noisy channels so its performance over satellite networks are totally different. Each satellite networks/constellations have different properties. The deployment height, motion, direction, link capacityall differ from one satellite constellations to another. So, certainly the behavior of TCP/IP will considerably differ from one satellite constellations than another. The Performance of three different TCP Congestion algorithms, Vegas, Reno and Bic are taken for evaluation on the simulated satellite network Iridium and the performance of the three algorithms under the satellites constellation is measured using suitable metrics. It is observed that, irrespective of the high end to end delay, the behavior of TCP/IP under Satellite network is somewhat resembling a high latency wired network. TCP under satellite network is not like that of a mobile ADHOC network. The observation resulted that the overall performance of Vegas was good in Iridium constellations. These reasons should be explored for designing a better congestion control algorithm exclusively for Satellite Networks.

Large-Sample Comparison of TCP Congestion Control Mechanisms over Wireless Networks

“…Of these studies, none examined two or more of the mechanisms included in this study. However, studies that examined latency found minimal differences between the latency achieved by different mechanisms [6], [8], [14], supporting the findings of this study.…”

“…Research into TCP congestion control mechanisms aims to improve the performance of existing congestion control mechanisms, usually measured based on throughput [7], [14], goodput [15], [8], or link utilisation [16]. As different throughput metrics have been utilised across these studies, direct comparisons between the results of studies utilising throughput, goodput and link utilisation are infeasible, the performance of congestion control mechanisms is examined, relative to others evaluated by the same study.…”

“…Although several metrics exist to quantify delay [18], the round trip time (RTT) experienced by data transmitted using each congestion control mechanism is most commonly reported metric [8], [14]. However, many studies do not measure or report delay.…”

“…As with intra-protocol fairness, many studies that evaluate TCP congestion control mechanisms do not consider the ability of new congestion control mechanisms to co-exist with existing -and commonly used -mechanisms such as Reno, NewReno, CUBIC and Compound TCP [19], [14]. Prior studies that have evaluated this metric report friendliness based on the throughput of the new congestion control mechanism, as compared to that of the existing mechanism [11], [7], [5].…”

Performance of Transmission Control Protocol Congestioncontrol Algorithms on Teledesic Satellites Constellations

“…The previous research made on Iridium satellite constellations (Nirmala and Pujeri, 2012)0 has proved the results of Vegas to be good and the comparative analysis among two satellite constellations Teledesic and Iridium will explore better data transmission over satellite networks.…”