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An energy-efficient power control approach for WLANs

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4 Author(s)
Ebert, Jean-Pierre ; Telecommunication Networks Group, University of Technology Berlin, Sekr. FT5-2, 10587 Berlin, Germany ; Stremmel, Bjorn ; Wiederhold, Eckhardt ; Wolisz, Adam

In this paper we consider the problem of reducing energy consumption during the transmission phase in WLANs. We found that for a given network configuration, channel characteristics, and packet length, an optimum RF transmission power level exists which assures a minimum energy expenditure for the actually transmitted bit of information. Based on this observation, we present a packet length dependent power control mechanism. We performed discrete event simulations of an IEEE 802.11 LAN in ad hoc mode using a two state Markov channel model. The achieved simulation results indicate a significant potential for energy saving. We also present a workable approach for choosing the most energy-saving RF transmit power level which is based on the perceived packet error rate of a single mobile.

Published in:

Communications and Networks, Journal of  (Volume:2 ,  Issue: 3 )