ABSTRACT Modern model‐based congestion control protocols such as BBR achieve high throughput by accurately estimating bottleneck bandwidth and RTT. However, during ProbeBW phases, bandwidth ramp‐up can introduce transient queues that accumulate over successive cycles, leading to tail latency increase and degraded performance for delay‐sensitive applications like video streaming. In this paper, we propose active queue debt compensation (AQDC‐BBR), a lightweight extension to BBR that explicitly quantifies and models the queue debt incurred during bandwidth probing and compensates it in subsequent phases. We evaluated AQDC‐BBR in both NS‐3 simulations and Mininet video streaming experiments. The results show that AQDC‐BBR reduces tail latency by 26% and 25% compared to Copa and PCC, respectively, and achieves a reduction of more than 25% compared to BBR and its variants, while maintaining stable high throughput.
Li et al. (Thu,) studied this question.