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Journal of Computer Networks and Communications
Volume 2012 (2012), Article ID 438654, 14 pages
http://dx.doi.org/10.1155/2012/438654
Research Article

Performance Analysis of the IEEE 802.11s PSM

1Department of Communications and Networking, Aalto University School of Electrical Engineering, Otakaari 5A, 02150 Espoo, Finland
2Nokia Corporation, Nokia Research Center, Otaniementie 19b, 02150 Espoo, Finland
3TeliaSonera, Sturenkatu 16, 00510 Helsinki, Finland

Received 15 June 2012; Accepted 18 October 2012

Academic Editor: Krishna Sayana

Copyright © 2012 Mirza Nazrul Alam et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

With the introduction of IEEE 802.11 power save mode (PSM), a lot of work has been done to enhance the energy saving ability of the wireless nodes. The ultimate goal of the research is to make the networking equipment carbon neutral and prolong the lifetime of the energy limited device for various applications; in some cases it is a trade-off between energy efficiency and delay. However, few studies have been made until now in the area of IEEE 802.11s based link specific power mode. The essence of this method is the ability of a node to maintain different power modes with its different peer nodes at the same time. A new peer service period (PSP) mechanism is also proposed in IEEE 802.11s amendment for transmitting to a receiver operating in PSM. In this paper the performance of the link specific power mode is studied for a single- and a multilink network in terms of energy, delay throughput, and sleep duration. It is found that at small load the energy saving could be as high as eighty percent when compared with the active mode operation. A stochastic model, based on discrete time discrete state Markov chain, is developed for one peer link operation to study the system behavior closely during PSM operation.