BMR: a new BBR algorithm with moderate delivery rate

Abstract

Google proposed a new congestion-based congestion control, BBR. BBR is originally rate-based congestion control, but was revealed to operate at inflight cap when BBR flows share the bottleneck link. In this paper, from our simple analysis results, we propose a new BBR algorithm, BMR (BBR with Moderate Rate) which adequately reduces transmission rate. Our simulation results show operation point of BMR is close to Kleinrock's ideal point, not a control point of BBR with inflight cap. We also show that BMR significantly improve RTT fairness and late arrival fairness issues of BBR.