A Proposal of Congestion Avoidance Communication Method Using Explicit Congestion Notification in HTTP/3 Applications

In recent years, a wide variety of devices, not just smartphones and connected vehicles, have been equipped with communication capabilities. As a result, Internet traffic has increased, and the resulting increase in network peak load has become a problem. Since the increase in peak load causes problems such as temporary decrease in communication throughput, it is considered effective to implement a mechanism to autonomously suppress communication on the terminal side when network congestion is expected. In this paper, we propose a congestion avoidance communication method that suspends data transmission during network congestion and resumes data transmission when the congestion is resolved, using Explicit Congestion Notification (ECN), an explicit congestion notification scheme at the IP layer, for non-time critical applications. We implement the proposed method and evaluate it in an emulation environment. And we also evaluate it in a simulation environment that combines a traffic flow simulator and a network simulator for application to connected vehicles, demonstrating that the proposed method works effectively.