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OPSM - Opportunistic Power Save mode for Infrastructure IEEE 802.11 WLAN

Kumar, Agrawal P and Kuri, A and Panda, J and Navda, MK and Ramjee, VR (2010) OPSM - Opportunistic Power Save mode for Infrastructure IEEE 802.11 WLAN. In: Proccedings of the IEEE ICC-10 Workshop on Energy Efficiency in Wireless Networks and Wireless Networks for Energy Efficiency (E2NETS), 23-27 May 2010, Bangalore.

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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.

Item Type: Conference Paper
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 20 Dec 2011 06:35
Last Modified: 20 Dec 2011 06:35
URI: http://eprints.iisc.ac.in/id/eprint/38854

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