Butt, Rizwan AslamFaheem, M.Ashraf, M. WaqarIdrus, Sevia M.2025-09-252025-09-2520181387-974X1572-8188https://doi.org/10.1007/s11107-018-0799-zhttps://hdl.handle.net/20.500.12573/4639Phd, Muhammad Faheem,/0000-0003-4628-4486; Ashraf, Dr. Muhammad Waqar/0000-0003-1591-7041; Butt, Rizwan Aslam/0000-0002-4784-0918;In passive optical network (PON), in addition to efficient bandwidth management, a dynamic bandwidth assignment (DBA) scheme can also enhance the energy efficiency performance of the optical networks units (ONUs) during sleep mode. A few such green DBA schemes have been proposed in literature for EPON, however, ITU compliant PONs have not got attention. In this study, the role of a DBA scheme during the cyclic sleep mode for XGPON has been investigated. A sleep assistive (SA)-DBA scheme is proposed that not only improves the energy saving performance of cyclic sleep mode but also reduces the upstream delays and variance for all the type-2 (T2), type-3 (T3) and type-4 (T4) traffic classes. Although, the upstream delay of type-1 (T1) traffic class slightly increases, the average upstream delay of all the traffic classes remains below the set target delay limit of 56ms.eninfo:eu-repo/semantics/closedAccessBandwidth EfficientBandwidth AssignmentEnergy EfficientPONXG-PONArticle10.1007/s11107-018-0799-z2-s2.0-85053612537