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Paper Abstract and Keywords
Presentation 2026-04-09 10:00
[Encouragement Talk] A Study on Improvement of BBR Bandwidth Overestimation Caused by Reverse Path Congestion
HayatoMoriyasu, Shotaro Ishikura, Miki Yamamoto (Kansai Univ) NS2026-1
Abstract (in Japanese) (See Japanese page) 
(in English) BBR (Bottleneck Bandwidth and Round-trip propagation time) is a new congestion control algorithm proposed by Google in 2016, designed to operate at the Kleinrock's ideal control point that achieves the maximal throughput with the minimum delay. BBR adjusts its sending rate based on the measured throughput of delivery rate and measured round-trip propagation delay. In our previous study, we show that delay jitter in ACK packets temporarily leads to overestimation of the delivery rate, leading to a long-time overestimation of available bandwidth. This behavior prevents BBR from operating at its designed ideal control point. To address this issue, we proposed LPF-BBR (Low-Pass-Filter-based BBR), which resolves temporal impact of delay jitter on ACK packets. However, the previous work used a probabilistic delay jitter model, which does not fully reproduce queue behavior, accordingly jitters in ACK in the real situation where other TCP flows coexist on the reverse path. In this paper, we evaluate BBR performance by using more realistic simulation model with a coexisting TCP New Reno flow in the reverse path. This allows us to evaluate how ACK jitter caused by a reverse-path TCP New Reno flow affects bandwidth overestimation in BBR and to verify the effectiveness of LPF-BBR.
Keyword (in Japanese) (See Japanese page) 
(in English) Congestion Control / BBR / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 2, NS2026-1, pp. 1-5, April 2026.
Paper # NS2026-1 
Date of Issue 2026-04-02 (NS) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF NS2026-1

Conference Information
Committee NS  
Conference Date 2026-04-09 - 2026-04-10 
Place (in Japanese) (See Japanese page) 
Place (in English) Yakushima Island Environmental and Cultural Village Center + Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Communication traffic theory, Traffic and quality evaluation, Network performance evaluation, QoS/QoE, Reliability and robustness, Traffic and quality management, AI and machine learning, Network and system operation management, High capacity, low latency, many connections, General 
Paper Information
Registration To NS 
Conference Code 2026-04-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Improvement of BBR Bandwidth Overestimation Caused by Reverse Path Congestion 
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Keyword(1) Congestion Control  
Keyword(2) BBR  
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1st Author's Name HayatoMoriyasu  
1st Author's Affiliation Kansai University (Kansai Univ)
2nd Author's Name Shotaro Ishikura  
2nd Author's Affiliation Kansai University (Kansai Univ)
3rd Author's Name Miki Yamamoto  
3rd Author's Affiliation Kansai University (Kansai Univ)
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Speaker Author-1 
Date Time 2026-04-09 10:00:00 
Presentation Time 25 minutes 
Registration for NS 
Paper # NS2026-1 
Volume (vol) vol.126 
Number (no) no.2 
Page pp.1-5 
#Pages 5 
Date of Issue 2026-04-02 (NS) 

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