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Limited bandwidth allocation scheme in EPON is shown to suffer from poor utilization under non-uniform traffic conditions, particularly as the number of ONUs, guard time and round-trip time increase. To resolve this problem, the authors propose a new scheme that allocates a timeslot intelligently by considering other ONUs' queue occupancy, instead of strictly enforcing a maximum timeslot size. The analysis and simulation results show that the proposed scheme can provide significantly higher utilization than conventional schemes while maintaining low average packet delay and can support max-min fairness under non-uniform traffic conditions as well.
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