Design of An Improved Ethernet AVB Model for Real-time Communication in In-Vehicle Network

The amount of traffics is increasing rapidly due to the increase of the number of electronic components and vehicle applications in vehicles. They require more network bandwidth and more stringent end-to-end latency and jitter constraints. In this situation, IEEE Audio/Video Bridging (AVB) is expected to be a promising technology in In-Vehicle Network since it guarantees high level of Quality of Service (QoS) for real-time communication. AVB defined tow SR-Classes for time sensitive traffics. However, as a result of the complexity of stream reservation domain construction, in-vehicle networks tend to use single traffic classes. In addition, the AVB jitter constraint is too weak. In this paper, an improved Ethernet AVB model with single SR-Class and time-triggered scheduling is proposed. In this model, time-sensitive traffics with high jitter requirements are forwarded through time-triggered scheduling, and ordinary time-sensitive flows are forwarded using SR-Class. Through simulations we confirm that proposed model not only satisfies the Qos requirements, but also has some extra advantages.