Improved RTT Fairness of BBR Congestion Control Algorithm Based on Adaptive Congestion Window

doi:10.3390/electronics10050615

	Improved RTT Fairness of BBR Congestion Control Algorithm Based on Adaptive Congestion Window
	Pan, Wansu 1,2; Tan, Haibo 2; Li, Xiru 2; Li, Xiaofeng 1,2
刊名	ELECTRONICS
	2021-03-01
卷号	10
关键词	TCP congestion control BBR RTT fairness congestion window
DOI	10.3390/electronics10050615
通讯作者	Li, Xiaofeng(xfli@hfcas.ac.cn)
英文摘要	To alleviate the lower performance of Transmission Control Protocol (TCP) congestion control over complex network, especially the high latency and packet loss scenario, Google proposed the Bottleneck Bandwidth and Round-trip propagation time (BBR) congestion control algorithm. In contrast with other TCP congestion control algorithms, BBR adjusted transfer data by maximizing delivery rate and minimizing delay. However, some evaluation experiments have shown that the persistent queues formation and retransmissions in the bottleneck can lead to serious fairness issues between BBR flows with different round-trip times (RTTs). They pointed out that small RTT differences cause unfairness in the throughput of BBR flows and flows with longer RTT can obtain higher bandwidth when competing with the shorter RTT flows. In order to solve this fairness problem, an adaptive congestion window of BBR is proposed, which adjusts the congestion window gain of each BBR flow in network load. The proposed algorithms alleviate the RTT fairness issue by controlling the upper limit of congestion window according to the delivery rate and queue status. In the Network Simulator 3 (NS3) simulation experiment, it shows that the adaptive congestion window of BBR (BBR-ACW) congestion control algorithm improves the fairness by more than 50% and reduces the queuing delay by 54%, compared with that of the original BBR in different buffer sizes.
资助项目	National Natural Science Foundation of China[61602435] ; National Natural Science Foundation of Anhui[1708085QF153]
WOS研究方向	Computer Science ; Engineering ; Physics
语种	英语
出版者	MDPI
WOS记录号	WOS:000628017000001
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of Anhui
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/121218]
专题	中国科学院合肥物质科学研究院
通讯作者	Li, Xiaofeng
作者单位	1.Chinese Acad Sci, Hefei Inst Phys Sci, Hefei 230031, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Pan, Wansu,Tan, Haibo,Li, Xiru,et al. Improved RTT Fairness of BBR Congestion Control Algorithm Based on Adaptive Congestion Window[J]. ELECTRONICS,2021,10.
APA	Pan, Wansu,Tan, Haibo,Li, Xiru,&Li, Xiaofeng.(2021).Improved RTT Fairness of BBR Congestion Control Algorithm Based on Adaptive Congestion Window.ELECTRONICS,10.
MLA	Pan, Wansu,et al."Improved RTT Fairness of BBR Congestion Control Algorithm Based on Adaptive Congestion Window".ELECTRONICS 10(2021).