oBBR - Optimize Retransmissions of BBR Flows on the Internet

Explore a 25-minute conference talk from USENIX ATC '23 that delves into optimizing retransmissions of BBR (Bottleneck Bandwidth and Round-trip propagation time) flows on the Internet. Learn about the challenges faced by BBR, a widely adopted model-based congestion control algorithm, and discover the innovative solution called oBBR. Understand how oBBR addresses high retransmission rates in BBR flows by adaptively scaling the in-flight data cap and updating bandwidth estimates. Gain insights into the performance improvements achieved by oBBR, including 1.54× higher goodput than BBRv2 and 39.48% fewer retransmissions than BBR-S. Examine the impact of oBBR on Internet streaming sessions and its ability to enhance Quality of Experience (QoE) without increasing retransmissions. Uncover the technical details behind oBBR's design, which aims to simultaneously achieve high goodput and low retransmissions in transmission sessions.