TCP BBR-n: Increased throughput for wireless-AC networks

Google proposed a new TCP congestion control algorithm (CCA), Bottleneck Bandwidth and Round-trip propagation time (BBR) which has opened up new dimensions in congestion control. BBR tries to operate near Kleinrock's operating point to avoid excessive queue formation at the bottleneck and to us...

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Bibliographic Details
Published in:PloS one 2023-12, Vol.18 (12), p.e0295576-e0295576
Main Authors: Ahsan, Muhammad, Muhammad, Sajid S
Format: Article
Language:English
Subjects:
Algorithms
Analysis
Bandwidths
Communications traffic
Computer and Information Sciences
Congestion
Control algorithms
Control systems
Control theory
Engineering research
Internet
Latency
Linux
Network latency
Physical Sciences
Research and Analysis Methods
Transmission Control Protocol/Internet Protocol (Computer network protocol)
Wireless access points
Wireless local area networks (Computer networks)
Wireless networks
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Summary:Google proposed a new TCP congestion control algorithm (CCA), Bottleneck Bandwidth and Round-trip propagation time (BBR) which has opened up new dimensions in congestion control. BBR tries to operate near Kleinrock's operating point to avoid excessive queue formation at the bottleneck and to use the link bandwidth optimally. BBR creates a model of the network path by measuring the bottleneck bandwidth and minimum round-trip time (RTT) to maximize the delivery rate and minimize latency. BBR v2 is an updated version of BBR which addresses many shortcomings of the original BBR (BBR v1) such as interprotocol fairness, RTT fairness, and excessive retransmissions. However, BBR v2 has certain limitations in its operation in IEEE 802.11ac (Wi-Fi 5) networks. The default BBR v2 limits the throughput of Wi-Fi 5 and an increased latency has been observed. This is because the Wi-Fi 5 frame aggregation logic is underutilized and fewer frames are being sent to the Wi-Fi 5 interface. In this paper, we have proposed BBR-n (BBR new) which provides better throughput than the generic BBR v2 in the Wi-Fi 5 networks. Real-time experiments were performed over a physical testbed using Flent to confirm that BBR-n achieves over double throughput as compared to generic BBR v2 and reduced latency in networks as compared to pure loss-based variants such as Cubic and Reno.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0295576