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| Along with the growing of telecommunication networks, devices of access networks contribute to a significant of total energy consumed by telecommunication network sectors. In recent studies, sleep mode is used as a common approach to reduce energy consumption in Ethenet passive optical networks(EPON). When the traffic of an optical network unit(ONU) meets certain conditions, Optical line terminal(OLT) allows ONU to switch from active mode into sleep mode, in order to reduce energy consumption. In this paper, a novel power saving mechanism for 10 Gbit/s Enthernet passive optical network(10G EPON) is proposed based on a centric dynamic bandwidth algorithm(DBA). The OLT assigns upstream and downstream bandwidth allocations for all ONUs in a centric way at the beginning of every DBA cycle, and informs ONUs to sleep within a period or sleep for several periods depending on the previously average traffic load in both downstream and upstream. The simulation results reveal that an ONU stays on sleep mode for more than 50% of the observation time averagely, and the average delay and packet loss of all ONUs prevail the requirments of access network when 10G EPON system is not at full capacity. |
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| Keywords:Optical Access Network; 10G EPON; Centric Dynamic Bandwidth Allocation(Centric DBA); Power Saving; Sleep mode |
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