Insomnia in the access: or how to curb access network related energy consumption
(2011) SIGCOMM ’11 — Location: TORONTO, CANADA (15.August.2011)
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- 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 (BH<sup>2</sup>), that takes advantage of the overlap of wireless networks to aggregate user traffic in as few gateways as possible. In current urban settings BH<sup>2</sup> 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 BH<sup>2</sup> and switching gets close to this margin, saving 66% on average.
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Citations
Goma, E., Canini, M., Lopez Toledo, A., Laoutaris, N., Kostic, D., Rodriguez, P., Stanojevic, R., & Yague Valentin, P. (2011). Insomnia in the access: or how to curb access network related energy consumption. Proceedings of the ACM SIGCOMM 2011 Conference. Published. SIGCOMM ’11, TORONTO, CANADA. https://doi.org/10.1145/2018436.2018475