Dynamic Bandwidth Allocation in Passive Optical Networks

The patent segments the grant cycle into multiple partial cycles, with each partial cycle dedicated to processing reports from a specific ONU group. This segmentation allows parallel processing of multiple reports without increasing overall system complexity, as each segment handles a limited subset of reports sequentially while the system as a whole achieves higher throughput and better synchronization.

The patent implements preliminary action by having ONUs freeze their queue status at the beginning of each partial cycle and report this frozen status to the OLT before the DBA processing begins. This preliminary reporting ensures that the OLT has accurate queue status information to work with, eliminating the synchronization loss that would occur if ONUs continued to update their queues during the DBA processing of full cycles.

The patent divides the ONU population into multiple groups and segments the grant cycle into corresponding partial cycles. Each partial cycle processes reports from one ONU group concurrently with other partial cycles processing different groups. This segmentation strategy enables parallel report processing across groups while keeping the complexity within each segment manageable, as each segment handles only a subset of ONUs rather than all ONUs simultaneously.