Optical Line Terminal Uplink Scheduling for PON Delay Reduction

The patent implements dynamic bandwidth allocation by allowing the OLT to flexibly adjust uplink transmission grant timing within the bandwidth allocation cycle. Instead of fixed allocation, the system dynamically determines transmission timing based on real-time traffic conditions, enabling both real-time and best-effort traffic to share the same cycle efficiently. This resolves the contradiction by making the bandwidth allocation adaptive rather than static.

The patent changes the timing parameter of uplink transmission grants within the bandwidth allocation cycle. By allowing transmission timing to be set at any point within the cycle rather than at fixed intervals, the system can optimize delay for real-time traffic while maintaining efficient resource utilization. This parameter flexibility enables the OLT to minimize delay without requiring separate fixed allocations.

The patent makes the uplink transmission grant timing dynamic within the bandwidth allocation cycle. The OLT can adjust the transmission timing for different ONUs on a per-cycle basis, allowing real-time traffic to be transmitted with minimal delay rather than waiting for fixed cycle boundaries. This dynamic approach enables delay to be less than the full allocation cycle while maintaining reliable real-time traffic accommodation.

The patent implements preliminary scheduling by the OLT that identifies and prioritizes real-time traffic before the bandwidth allocation cycle completes. By preparing transmission grants in advance with optimized timing, the system ensures real-time traffic can be transmitted with delay less than the full allocation cycle, improving responsiveness while maintaining cycle-based coordination.

The patent implements dynamic bandwidth sharing where the division of the allocation cycle between real-time and best-effort traffic is not fixed but adapts to actual traffic conditions. The OLT dynamically determines the optimal timing and duration for real-time traffic grants within each cycle, allocating bandwidth precisely when needed rather than reserving fixed portions. This eliminates waste while maintaining low delay for real-time traffic.

The system allows best-effort traffic to utilize remaining bandwidth resources automatically when real-time traffic demands are low. Instead of reserving bandwidth that may go unused, the OLT's flexible grant timing enables best-effort traffic to self-serve from available capacity, optimizing overall bandwidth utilization while ensuring real-time traffic receives necessary resources.