The loading-aware energy saving scheme for EPON networks

Chien Ping Liu*, Ho Ting Wu, Kai Wei Ke, Chia Chih Chien

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

1 Scopus citations


This paper proposes an energy saving mechanism in Ethernet passive optical networks (EPONs) for the optical network unit (ONU). It measures traffic loading continuously to identify traffic load for each ONU, then classifies such load to either a low or high loading level. The scheme allows ONU to transmit packets only when the system stays in high load conditions, otherwise ONU changes to one of power saving modes. Therefore, ONU can accumulate queued packets in low-load scenario and stay in power saving mode for longer duration. However, in order to avoid long queueing delay of high priority packets, the ONU will not switch to power saving mode, if the queue of high priority packets is not empty. Comparing to a previous proposed tri-mode energy saving scheme which imposed strict restriction on ONU's staying in energy saving modes, the proposed scheme achieves energy saving improvement without suffering noticeable delay performance degradation.

Original languageEnglish
Pages (from-to)146-156
Number of pages11
JournalInternational Journal of Computational Science and Engineering
Issue number2
StatePublished - 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
Copyright © 2019 Inderscience Enterprises Ltd.


  • Delay performance
  • EPON
  • Energy saving
  • Ethernet passive optical network
  • Loading aware


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