Title: Enhanced TCP BBR performance in wireless mesh networks (WMNs) and next-generation high-speed 5G networks

Authors: Bazi Kaoutar; Nassereddine Bouchaib

Addresses: Applied Mathematics and Computer Science laboratory, FST, Hassan First University, Settat, Morocco ' Applied Mathematics and Computer Science laboratory, FST, Hassan First University, Settat, Morocco

Abstract: TCP BBR is one of the most powerful congestion control algorithms. In this article, we provide a comprehensive review of BBR analysis, expanding on existing knowledge across various fronts. Utilising ns3 simulations, we evaluate BBR's performance under diverse conditions, generating graphical representations. Our findings reveal flaws in the probe's RTT phase duration estimation and unequal bandwidth sharing between BBR and CUBIC protocols. Specifically, we demonstrated that the probe's RTT phase duration estimation algorithm is flawed and that BBR and CUBIC generally do not share bandwidth equally. Towards the end of the article, we propose a new improved version of TCP BBR which minimises these problems of inequity in bandwidth sharing and corrects the inaccuracies of the two key parameters RTprop and cwnd. Consequently, the BBR' protocol maintains very good fairness with the Cubic protocol, with an index that is almost equal to 0.98, and an equity index over 0.95.

Keywords: TCP; BBR; cubic; performance; throughput; WMNs; fairness; equity; cwnd; RTprop.

DOI: 10.1504/IJIPT.2023.139364

International Journal of Internet Protocol Technology, 2023 Vol.16 No.4, pp.226 - 239

Received: 09 Nov 2022
Accepted: 20 Mar 2024
Published online: 01 Jul 2024 *

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