6D-04
BBR+: Improvement of Congestion-Based Congestion Control for Deep Buffer Link
○Utsumi Satoshi（福島大），Weizhi Shi（Chongquing University of Technology），Suzuki Norio（Fukushima University），Zabir Salim（National Institute of Technology, Tsuruoka College）
In September 2016, Google presented a new congestion-based congestion control TCP BBR (Bottleneck Bandwidth and Round-trip propagation time), and it was available in Linux kernel version 4.9 or later. TCP BBR is a high perfoamance congestion control, which maximizes utilization of the bottleneck link, avoiding bufferbloat problem. However, TCP CUBIC is known as the default congestion control in Linux, in Android, and in iOS. The paper points out the performance degradation problem when TCP BBR flows co-exist with TCP CUBIC flows in large buffer links, in which bufferbloat is more probable. In this paper, we propse a new congestion-based congestion control TCP BBR+ which has high performance when co-existance with TCP CUBIC, and evaluate its performance.
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