A 5G-TSN Joint Scheduling Mechanism Considering Finite Buffer in DS-TT

With the advent of Industry 4.0, 5G and Time Sensitive Networking (TSN) are emerging as wireless deterministic communication network to provide solid QoS guarantee for industrial automation services. For 5G-TSN collaboration system, two important gateways are introduced in both network and end device side to support TSN protocols, named as Network-side TSN Translator (NW-TT) and Device-side TSN Translator (DS-TT) respectively. However, 5G and TSN are totally different in terms of resource type, scheduling methodology and management protocols, in order to provide latency guarantee for time-triggered flows across 5G and TSN, as well as to make two different scheduling of 5G and TSN coordinately, a 5G-TSN joint scheduling mechanism based on enhanced Maximum Latency Weighted Delay First (eMLWDF) is proposed and analyzed in this paper. The proposed mechanism designs an adaptive factor in scheduling procedure to make well balance between achieving low latency in 5G and avoiding buffer overflow in DS-TT. Furthermore, some packet will arrival at the priority queue in DS-TT later than the period of "ON" for that queue due to fluctuations of radio channel, to avoid this situation, a frame preemption scheme is adopted to provide latency guarantee. Simulation results demonstrate that the proposed mechanism can satisfy the latency requirements of time-triggered flows as well as reduce data buffer volumes in DS-TT, aiming to provide deterministic communication guarantee for data transmission across 5G and TSN.