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Paper Abstract and Keywords
Presentation 2026-03-04 11:10
Fairness Analysis of Congestion Control Algorithm on Multiple Links
Kako Harada, Noriaki Kamiyama (Ritsumeikan Univ.) NS2025-235
Abstract (in Japanese) (See Japanese page) 
(in English) The rapid expansion of video streaming and cloud services has resulted in a substantial increase in internet traffic volume. Effective and stable utilization of limited network resources requires robust congestion control mechanisms. As a core function of TCP, congestion control mitigates packet loss and delay by dynamically adjusting transmission rates. Traditionally, loss-based algorithms such as TCP-Reno (Reno) and CUBIC-TCP (Cubic) have been widely adopted, relying on packet loss detection to regulate transmission. More recently, delay-based algorithms like BBR (bottleneck bandwidth and round-trip propagation time), developed by Google, have gained significant traction. When congestion control algorithms with differing operational principles coexist on the same link, allocation of transmission bandwidth can become skewed, favoring certain flows and resulting in fairness issues. Previous studies on congestion control fairness have predominantly utilized a Dumbbell topology, which models only a single network link, thereby limiting the evaluation of more complex, multi-link paths. This study assesses throughput fairness among BBR, Reno, and Cubic in both Dumbbell and multi-hop topologies. The findings reveal distinct trends between these topologies, demonstrating that single-link evaluations do not adequately capture the influence of round-trip time (RTT) differences on bandwidth distribution. These results underscore the necessity for a new fairness evaluation framework that incorporates flow interactions in multi-hop environments, as well as the effects of delay and buffer size.
Keyword (in Japanese) (See Japanese page) 
(in English) congestion control algorithm / throughput fairness / multiple links / / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 385, NS2025-235, pp. 84-89, March 2026.
Paper # NS2025-235 
Date of Issue 2026-02-25 (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 NS2025-235

Conference Information
Committee IN NS  
Conference Date 2026-03-04 - 2026-03-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa-Ken Shichoson Jichi Kaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To NS 
Conference Code 2026-03-IN-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Fairness Analysis of Congestion Control Algorithm on Multiple Links 
Sub Title (in English)  
Keyword(1) congestion control algorithm  
Keyword(2) throughput fairness  
Keyword(3) multiple links  
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1st Author's Name Kako Harada  
1st Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
2nd Author's Name Noriaki Kamiyama  
2nd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
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Speaker Author-1 
Date Time 2026-03-04 11:10:00 
Presentation Time 25 minutes 
Registration for NS 
Paper # NS2025-235 
Volume (vol) vol.125 
Number (no) no.385 
Page pp.84-89 
#Pages 6 
Date of Issue 2026-02-25 (NS) 

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