A CSQF-Based Deterministic Scheduling Scheme for Industrial Passive Optical Networks

Industrial Passive Optical Networks (IPONs) are rising recently in industrial Internet scenarios due to their high reliability and low cost. However, traditional dynamic bandwidth allocation (DBA) schemes for IPON introduce latency and jitter uncertainty, challenging guaranteeing the delay requirement for industry networks. This paper proposes a CSQF-based scheduling scheme that integrates a multi-queue cyclic mechanism to reduce polling frequency and ensure bounded delay. Simulation results show a 47% reduction in ONU packet delay, over 50% fewer polling cycles, and a 42% decrease in end-to-end latency.