TSN-Aware Service-Window Grant Scheduling for 10G-EPON Access Networks

In converged TSN–10G-EPON networks, optical grant completion determines when upstream traffic becomes available to the scheduled backbone. This paper proposes Service-Window Grant Dynamic Bandwidth Allocation (SWG-DBA), which converts a native-TSN occupancy profile into path-continuous service windows and realizes the selected ingress targets through deadline-budgeted just-in-time (JIT) optical grants. The window search checks a frame-level transmission footprint across every backbone hop, allowing TSN service opportunities to guide PON grant placement. A joint target-construction extension incorporates competition among upstream instances while retaining the same optical executor. We derive the readiness margin provided by JIT waiting and evaluate end-to-end delivery using realized grant completions in a common EDF backbone pass. Experiments compare five access baselines and five mechanism configurations on a seven-switch topology, using paired seeds and separate delivery, latency, burst, and ONU/OLT buffer metrics. At T=360,U=640, SWG and Joint-SWG achieve 95.87% and 96.11% upstream success, compared with 80.41% for EDF Grant. Joint construction reduces the OLT peak by 68.0% relative to independent construction at this load, with additional ONU storage. At T=360,U=240, both JIT configurations retain more than 99.8% upstream success under a 500 ns readiness-error bound; their no-JIT counterparts achieve approximately 31%. Guard, backbone-load, and deadline sweeps characterize the operating tradeoffs of this simulated planning framework.