A Study on Transmission Selection for Credit-Based Shaper in IEEE 802.1TSN

This paper proposes a novel method of Transmission Selection (TS) for Credit-Based Shaper (CBS) in IEEE 802.1TSN. To realize Smart Factory, Ethernet is increasingly being adopted for industrial networks. However, QoS control is essential since various data are transmitted on Ethernet. Consequently, the adoption of IEEE 802.1TSN to industrial networks is being considered. CBS is the most considered among many controls defined in IEEE 802.1 TSN because of its lightweight implemen-tation. On the other hand, CBS requires TS since it is a shaper. In general, CBS is combined with Strict Priority (SP) as TS. SP transmits frames according to priority. As a result, the maximum transmission delay of middle- or low-priority frames can be significant. This study proposed transmitting frames according to the queue length instead of priority to improve the above issue. From the experimental results, this paper confirmed the effectiveness of the proposal method.