QoS Evaluation of ATS in IEEE 802.1TSN on In-Vehicle Ethernet by Comparing with CBS and TAS

Abstract

This paper evaluates the QoS of Ethernet-based in-vehicle networks with Asynchronous Traffic Shaping (ATS), Credit-Based Shaper (CBS), and Traffic Aware Shaper (TAS), which are QoS controls defined in IEEE 802.1TSN(Time Sensitive Networking), by experiment; it then compares QoS among them. Since the number of ECUs is increasing and moving toward the realization of fully automated vehicles, Ethernet is being introduced to send them. In addition, as Ethernet-based in-vehicle networks are being deployed, adopting IEEE 802.1TSN is also being considered. Although many studies have evaluated QoS controls, such as CBS and TAS, few studies of QoS provided ATS over in-vehicle networks. Thus, the authors evaluate the QoS of ATS and then compare ATS to the other QoS controls by two experiments. One evaluates basic QoS, and the other treats actual use cases. Experimental results show that ATS can suppress maximum delay and frame losses more than the other controls when the frame interval is wide and the size is large over in-vehicle network. Moreover, they also indicate that ATS can reduce the maximum delay and delay jitter at the sacrifice of the frame loss rate by lowering the maximum residence time. Therefore, if the requirement for delay is more important than that for frame losses. it is better to adopt ATS.