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Paper Abstract and Keywords
Presentation 2026-05-14 13:55
[Invited Lecture] Applying BMR for Improving BBR Bandwidth Overestimation Caused by Delay Jitter in Backward Path
Hayato Moriyasu, Shotaro Ishikura, Miki Yamamoto (Kansai Univ) NS2026-25
Abstract (in Japanese) (See Japanese page) 
(in English) BBR (Bottleneck Bandwidth and Round-trip propagation time) is a congestion control algorithm that aims to operate at Kleinrock's ideal operating point, which simultaneously achieves minimum delay and maximum throughput. It is well known that BBR tends to overestimate the available bandwidth (BtlBw) when multiple BBR flows share a bottleneck link. We have proposed a new BBR-based algorithm, named BMR (BBR with Moderate Rate), which mitigates bandwidth overestimation by appropriately reducing the transmission rate.
Bandwidth overestimation also occurs due to ACK jitter caused by congestion on the reverse path. In this paper, we investigate the causes of this overestimation through performance evaluation using computer simulations.
Our evaluation results show that overestimation occurs only when the sending rate of BBR and the measured delivery rate increase simultaneously. These increases are independent, because the former is mainly caused by BBR behavior on the forward path, whereas the latter is caused by congestion on the reverse path. To address this issue, we apply BMR, which reduces the transmission rate of BBR. Our results demonstrate that BMR effectively mitigates bandwidth overestimation caused by reverse-path congestion.
Keyword (in Japanese) (See Japanese page) 
(in English) Congestion Control / BBR / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 21, NS2026-25, pp. 43-48, May 2026.
Paper # NS2026-25 
Date of Issue 2026-05-07 (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 NS2026-25

Conference Information
Committee NS  
Conference Date 2026-05-14 - 2026-05-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Hakata Kindai Building + Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) High level protocol, Networking technologies (IP and high-layer routing/filtering, Multicast, Quality/Routing control), IP network application technologies (P2P, P4P, Overlay, SIP, NGN), Network system related technologies (System configuration, Interface, Architecture, Hardware/Software/Middleware), Security, Blockchain etc. 
Paper Information
Registration To NS 
Conference Code 2026-05-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Applying BMR for Improving BBR Bandwidth Overestimation Caused by Delay Jitter in Backward Path 
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Keyword(1) Congestion Control  
Keyword(2) BBR  
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1st Author's Name Hayato Moriyasu  
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 2026-05-14 13:55:00 
Presentation Time 25 minutes 
Registration for NS 
Paper # NS2026-25 
Volume (vol) vol.126 
Number (no) no.21 
Page pp.43-48 
#Pages 6 
Date of Issue 2026-05-07 (NS) 

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