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A Microscopic Study of Power Management in IEEE 802.11 Wireless Networks

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Title: A Microscopic Study of Power Management in IEEE 802.11 Wireless Networks
Author(s): Hu, Chunyu; Zheng, Rong; Hou, Jennifer C.; Sha, Lui
Subject(s): wireless networks
Abstract: IEEE 802.11 power saving mode (PSM) has been proposed in wireless LANs and multi-hop wireless networks to coordinate power states of wireless devices. In IEEE 802.11 PSM, power management decisions to wake up wireless devices or put them to sleep states are made periodically in every beacon interval. In this paper, we demonstrate via a rigorous, analytical model (the result of which is corroborated by simulation results) that such a periodic structure together with its signaling overhead leads to both energy and bandwidth under-utilization. We then devise SIMPA, a new power management protocol based on IEEE 802.11 PSM, to decouple the power management decision points and the beacon intervals, so as to allow fine grained control. In SIMPA, wireless devices can switch to the sleep state inside a beacon interval or extend their active states beyond one beacon interval. A comprehensive simulation study in both single hop wireless LANs without the AP support and multi-hop wireless networks demonstrates that as compared to IEEE 802.11 PSM, SIMPA can effectively reduce energy consumed under light to medium traffic loads and retain the network capacity for data transport at high traffic loads.
Issue Date: 2004-07
Genre: Technical Report
Type: Text
URI: http://hdl.handle.net/2142/10909
Other Identifier(s): UIUCDCS-R-2004-2452
Rights Information: You are granted permission for the non-commercial reproduction, distribution, display, and performance of this technical report in any format, BUT this permission is only for a period of 45 (forty-five) days from the most recent time that you verified that this technical report is still available from the University of Illinois at Urbana-Champaign Computer Science Department under terms that include this permission. All other rights are reserved by the author(s).
Date Available in IDEALS: 2009-04-17
 

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