Insomnia in the access: Or how to curb access network related energy consumption

Eduard Goma*, Marco Canini, Alberto Lopez Toledo, Nikolaos Laoutaris, Dejan Kostić, Pablo Rodriguez, Rade Stanojević, Pablo Yagüe Valentín

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

50 Scopus citations

Abstract

Access networks include modems, home gateways, and DSL Access Multiplexers (DSLAMs), and are responsible for 70-80% of total network-based energy consumption. In this paper, we take an in-depth look at the problem of greening access networks, identify root problems, and propose practical solutions for their user-and ISP-parts. On the user side, the combination of continuous light traffic and lack of alternative paths condemns gateways to being powered most of the time despite having Sleep-on-Idle (SoI) capabilities. To address this, we introduce Broadband Hitch-Hiking (BH2), that takes advantage of the overlap of wireless networks to aggregate user traffic in as few gateways as possible. In current urban settings BH2 can power off 65-90% of gateways. Powering off gateways permits the remaining ones to synchronize at higher speeds due to reduced crosstalk from having fewer active lines. Our tests reveal speedup up to 25%. On the ISP side, we propose introducing simple inexpensive switches at the distribution frame for batching active lines to a subset of cards letting the remaining ones sleep. Overall, our results show an 80% energy savings margin in access networks. The combination of BH2 and switching gets close to this margin, saving 66% on average.

Original languageEnglish (US)
Title of host publicationProceedings of the ACM SIGCOMM 2011 Conference, SIGCOMM'11
Pages338-349
Number of pages12
DOIs
StatePublished - Sep 29 2011
EventACM SIGCOMM 2011 Conference, SIGCOMM'11 - Toronto, ON, Canada
Duration: Aug 15 2011Aug 19 2011

Publication series

NameProceedings of the ACM SIGCOMM 2011 Conference, SIGCOMM'11

Other

OtherACM SIGCOMM 2011 Conference, SIGCOMM'11
CountryCanada
CityToronto, ON
Period08/15/1108/19/11

Keywords

  • Broadband access networks
  • Energy

ASJC Scopus subject areas

  • Computer Graphics and Computer-Aided Design

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