Study on Effect of Time Synchronization Precision on QoS with Time-Aware Shaper

This paper studies the effect of the precision of the time synchronization on the QoS of Time-Aware Shaping (TAS). TAS is one of the standards defined in IEEE 802.1TSN(Time-Sensitive Networking) and being considered as the priority control for the Ethernet-based in-vehicle networks. Although TAS can control more exactly than other controls by using gates at egress ports, it requires pretty precision of the time synchronization. However, since many in-vehicle devices has no clock for the time synchronization, the time synchronization is not always exact. However, the precision of the time synchronization affects QoS, but it is not clear yet. Therefore, this paper evaluates QoS over in-vehicle networks under scenarios with various lags of the time synchronization by simulation.