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Open AccessArticle

An Energy-Efficient Distributed Dynamic Bandwidth Allocation Algorithm for Passive Optical Access Networks

1
i2CAT Foundation, C/Gran Capità 2-4, Edifici Nexus I, 08034 Barcelona, Spain
2
Department of Network Engineering, Universitat Politècnica de Catalunya (UPC), Esteve Terrades 7, Castelldefels, 08860 Barcelona, Spain
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(6), 2264; https://doi.org/10.3390/su12062264
Received: 12 February 2020 / Revised: 5 March 2020 / Accepted: 11 March 2020 / Published: 13 March 2020
The rapid deployment of passive optical access networks (PONs) increases the global energy consumption of networking infrastructure. This paper focuses on the minimization of energy consumption in Ethernet PONs (EPONs). We present an energy-efficient, distributed dynamic bandwidth allocation (DBA) algorithm able to power off the transmitter and receiver of an optical network unit (ONU) when there is no upstream or downstream traffic. Our main contribution is combining the advantages of a distributed DBA (namely, a smaller packet delay compared to centralized DBAs, due to less time being needed to allocate the transmission slot) with energy saving features (that come at a price of longer delays due to the longer queue waiting times when transmitters are switched off). The proposed algorithm analyzes the queue size of the ONUs in order to switch them to doze/sleep mode when there is no upstream/downstream traffic in the network, respectively. Our results show that we minimized the ONU energy consumption across a wide range of network loads while keeping delay bounded. View Full-Text
Keywords: passive optical network (PON); ethernet passive optical network (EPON); energy management; energy saving; dynamic bandwidth allocation (DBA) passive optical network (PON); ethernet passive optical network (EPON); energy management; energy saving; dynamic bandwidth allocation (DBA)
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Khalili, H.; Rincón, D.; Sallent, S.; Piney, J.R. An Energy-Efficient Distributed Dynamic Bandwidth Allocation Algorithm for Passive Optical Access Networks. Sustainability 2020, 12, 2264.

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