ISSN : 1796-2056
Volume : 2    Issue : 4    Date : August 2007

Traffic Aware Power Saving Protocol in Multi-hop Mobile Ad-Hoc Networks
Abdelfattah Belghith, Wafa Akkari, and Jean Marie Bonnin
Page(s): 1-13
Full Text:
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This paper presents an optimization of PSM to improve its energy conservation. According to PSM,
time is divided into beacon intervals. At the beginning of each beacon interval, all stations must be
awake during a specific period called ATIM window to be able to send and receive synchronization
messages and announcements of buffered data frames. PSM specifies that a station having sent or
received an announcement or having sent a beacon must remain awake during the entire beacon  
interval. This may lead to wasting energy specially at light traffic loads where stations should
conserve the most. We propose an enhancement called the Traffic Aware Power Saving Mode
(TA-PSM) to solve this problem by allowing nodes to enter the doze state when they are no more
involved in data delivery even if they have already sent a beacon, an ATIM or an ATIM-ACK. Our
objective is to reduce the energy consumption without any throttling to throughput. Extensive
simulations based on fixed and dynamic topologies showed that TA-PSM provides a much better
energy conservation and a lower power consumption per delivered data frame.

Index Terms
Power Conservation, Ad-Hoc networks, Simulation, Performance Evaluation.