NDLI: OPSM - Opportunistic Power Save Mode for Infrastructure IEEE 802.11 WLAN

Content Provider	IEEE Xplore Digital Library
Author	Agrawal, P. Kumar, A. Kuri, J. Panda, M.K. Navda, V. Ramjee, R.
Copyright Year	2010
Abstract	We focus on the energy spent in radio communication by the stations (STAs) in an IEEE 802.11 infrastructure WLAN. All the STAs are engaged in web browsing, which is characterized by a short file downloads over TCP, with short duration of inactivity or think time in between two file downloads. Under this traffic, Static PSM (SPSM) performs better than CAM, since the STAs in SPSM can switch to low power state (sleep) during think times while in CAM they have to be in the active state all the time. In spite of this gain, performance of SPSM degrades due to congestion, as the number of STAs associated with the access point (AP) increases. To address this problem, we propose an algorithm, which we call opportunistic PSM (OPSM). We show through simulations that OPSM performs better than SPSM under the aforementioned TCP traffic. The performance gain achieved by OPSM over SPSM increases as the mean file size requested by the STAs or the number of STAs associated with the AP increases. We implemented OPSM in NS-2.33, and to compare the performance of OPSM and SPSM, we evaluate the number of file downloads that can be completed with a given battery capacity and the average time taken to download a file.
Starting Page	1
Ending Page	6
File Size	143390
Page Count	6
File Format	PDF
ISBN	9781424468249
e-ISBN	9781424468263
DOI	10.1109/ICCW.2010.5503903
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-05-23
Publisher Place	South Africa
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Degradation Wireless LAN CADCAM Design engineering Computer aided manufacturing Switches Tail Traffic control Performance gain Communications technology
Content Type	Text
Resource Type	Article

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