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Improving IEEE 802.11 power saving mechanism

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Abstract

This paper presents an optimization of the power saving mechanism in the Distributed Coordination Function (DCF) in an Independent Basic Service Set (IBSS) of the IEEE 802.11 standard. In the power saving mode specified for DCF, time is divided into so-called beacon intervals. At the start of each beacon interval, each node in the power saving mode periodically wakes up for a duration called the ATIM Window. Nodes are required to be synchronized to ensure that all nodes wake up at the same time. During the ATIM window, the nodes exchange control packets to determine whether they need to stay awake for the rest of the beacon interval. The size of the ATIM window has a significant impact on energy saving and throughput achieved by the nodes. This paper proposes an adaptive mechanism to dynamically choose a suitable ATIM window size. We also allow the nodes to stay awake for only a fraction of the beacon interval following the ATIM window. On the other hand, the IEEE 802.11 DCF mode requires nodes to stay awake either for the entire beacon interval following the ATIM window or not at all. Simulation results show that the proposed approach outperforms the IEEE 802.11 power saving mechanism in terms of throughput and the amount of energy consumed.

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Authors and Affiliations

  1. Networking Technology Laboratory, Samsung Advanced Institute of Technology, Korea

    Eun-Sun Jung

  2. Department of Electrical and Computer Engineering, and Coordinated Science Laboratory, University of Illinois, Urbana, IL, USA

    Nitin H. Vaidya

Authors
  1. Eun-Sun Jung
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  2. Nitin H. Vaidya
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Corresponding author

Correspondence to Eun-Sun Jung.

Additional information

This research is supported in part by National Science Foundation grant 01-25859.

Eun-Sun Jung received a Ph.D. degree in Computer Science from Texas A&M University, USA, an M.S. degree in Information Security from University of London, UK, and a B.S degree in Computer Science and Statistics from Dankook University, Seoul, Korea. From 1995 to 1996 she was a member of technical staff in Hanwha Corporation, Seoul, Korea. In 1999, she was employed by Korea Information Security Agency as a research scientist. Since 2005, she has been with Samsung Advanced Institute of Technology, Korea, as a senior researcher. Her research interests include Wireless Networks, Mobile Computing, and Network Security.

Nitin Vaidya received the Ph.D. from the University of Massachusetts at Amherst. He is presently an Associate Professor of Electrical and Computer Engineering at the University of Illinois at Urbana-Champaign (UIUC). He has held visiting positions at Microsoft Research, Sun Microsystems and the Indian Institute of Technology-Bombay, as well as a faculty position at the Texas A&M University. His current research is in wireless networking and mobile computing. He co-authored papers that received awards at the ACM MobiCom and Personal Wireless Communications (PWC) conferences. Nitin’s research has been funded by various agencies, including the National Science Foundation, DARPA, Motorola, Microsoft Research and Sun Microsystems. Nitin Vaidya is a recipient of a CAREER award from the National Science Foundation. Nitin has served on the committees of several conferences, including as program co-chair for 2003 ACM MobiCom and General Chair for 2001 ACM MobiHoc. He has served as an editor for several journals, and presently serves as the Editor-in-Chief for the IEEE Transactions on Mobile Computing. He is a senior member of the IEEE and a member of the ACM. For more information, please visit http://www.crhc.uiuc.edu/~nhv/.

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Jung, ES., Vaidya, N.H. Improving IEEE 802.11 power saving mechanism. Wireless Netw 14, 375–391 (2008). https://doi.org/10.1007/s11276-006-0726-6

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