A New Design for Control Method Based on Hierarchical Deficit Round Robin Scheduler for EPON
Keywords:Ethernet passive optical network (EPON), Dynamic Bandwidth Allocation, Hierarchical Scheduling, Quality of Service (QoS).
With the development of ICT (Information and Communication Technology),Â how to use EPON for ensuring an effective and fair bandwidth allocation asÂ well as the quality of service has become an important issue. Our research is based onÂ Cousin Fair Hierarchical Deficit Round Robin Dynamic Bandwidth Allocation (CFHDRRÂ DBA), which applies the concepts of hierarchical scheduling to reduce extra actionsÂ in information controlling and queue switching and DRR (Deficit Round Robin)Â to attain the goal of cousin fairness. Our research proposes three additional modulesÂ to CFHDDR DBA: (1) an admission control module, which limits the sum weight ofÂ QoS-controlled flow; (2) a weight partition module, which isolates the sum weight ofÂ other interfering flows from QoS-controlled flows; and (3) the quantum adaptationÂ module, which minimizes the access time of QoS-controlled flows through Â uantumÂ distribution. With the help of OMNet++ simulation software, this research presentsÂ the improvement of CFHDRR by introducing dynamic DDR Quantum. In addition,Â it proposes admission control and bounded weight to keep the sum of flows withinÂ service capacity. The simulation result shows that, while keeping CFHDRR’s fairness,Â the queuing delay is reduced and the cycle time is effectively controlled so that theÂ packet delay of QoS-controlled flows is minimized and QoS of real-time multimediaÂ in EPON is fairly ensured.
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