QUIC Delay Control: an implementation of congestion and delay control

TL;DR

This paper introduces QUIC Delay Control, a novel congestion and delay control algorithm for QUIC that estimates queueing delay to react early to congestion, improving real-time communication performance.

Contribution

The paper presents a new delay-aware congestion control algorithm integrated with TCP Westwood+ in QUIC, demonstrating improved delay and loss performance over existing algorithms.

Findings

Significantly reduces packet losses and delays

Preserves network utilization

Effective in both emulated and real networks

Abstract

A new congestion and delay control algorithm named QUIC Delay Control (QUIC-DC) is proposed for controlling not only congestion but also the queueing delay encountered along the forward communication path. The core idea is to estimate the one-way queueing delay of a connection to trigger an early reaction to congestion. This idea, along with a the TCP Westwood+ congestion control algorithm, has been implemented in QUIC-DC and compared with QUIC Cubic, BBRv2, NewReno, Westwood+. The results obtained in the emulated and real network environments show that QUIC-DC can significantly reduce packet losses along with end-to-end communication delays, while preserving network utilization, features that are both very useful for real-time applications.