Periodic GATE Optimization (PGO) in Long-Reach Passive Optical Networks

In this paper, we propose a bandwidth allocation service for using the Multi-Point Control Protocol (MPCP) in Long-Reach Passive Optical Networks. We modify and enhance the previously proposed Multi-Thread Polling and call it Periodic GATE Optimization (PGO). The challenge in Long-Reach PON is the long distance between the OLT and the ONUs which is 100 km here. Polling each ONU with multiple threads running in parallel is adopted from multi-thread polling. PGO periodically takes the snapshot of the network and forms an ILP model to estimate the appropriate GATE credits of the overloaded ONUs for the next period. The simulation results show that PGO leads to a lower delay and shorter queue length while keeping the packet loss at a low level.