A Traffic Scheduling Algorithm Combined with Ingress Shaping in TSN

Abstract

Most of the recent researches related to hybrid traffic scheduling in Time-Sensitive Networking (TSN) focus on how to ensure bounded low-delay transmission for Scheduled Traffic (ST) and Stream Reservation (SR) traffic. However, if high-priority traffic blocks Best Effort (BE) traffic represented by data logging and periodic software updates for a long time, the end-to-end delay of BE messages will be too large. To reduce the blocking of SR traffic on BE traffic by reducing the reserved bandwidth for SR traffic, this paper proposes a traffic scheduling algorithm combined with ingress shaping. First, add ingress buffers before SR queues. Then, schedule SR traffic on a per-flow basis in the TSN switch by limiting the rate at which frames in each ingress buffer enter the SR queue. Finally, joint egress shaping and ingress shaping to reserve bandwidth resources that match its delay requirement for each SR flow. Simulation results show that the maximum end-to-end delay of BE messages can be reduced by 0.32%~17.19%.