A multi-subnet scheduling scheme for real-time Ethernet system

Small cycle payloads and very short cycle times in isochronous systems lead to a high protocol overhead and low bandwidth utilization which bother existing studies and applications in real-time Ethernet systems. Aiming at reducing the protocol overheads and increasing the system scale, a multi-subnet network with a hierarchical tree topology and a relevant time slots allocation scheme are proposed in this paper. Simulation results verify the validity of the multi-subnet approach and the corresponding scheduling scheme.