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Journal of Information Science and Engineering, Vol. 25 No. 5, pp. 1447-1463 (September 2009)

Distributed Transmission Power Control Algorithm for Wireless Sensor Networks*

1Department of Computer Science
National Tsing Hua University
Hsinchu, 300 Taiwan
2Department of Computer Science and Information Engineering
National Central University
Jhongli, 320 Taiwan

In this paper, we propose a distributed transmission power control algorithm which cannot only prolong the lifetime of sensor nodes by saving the energy consumption but enhance the performance of packet delivery ratio. Besides, it can also reduce the interference between transmitting nodes. Before designing our algorithm, we firstly investigate the impact of link quality when utilizing different transmission power by analyzing lots of experimental data, and then design our algorithm based on those experimental results. In our algorithm, each node utilizes the RSSI (Received Signal Strength Indicator) value and LQI (Link Quality Indicator) value of the radio to determine the appropriate transmission power for its neighbors. Our algorithm can dynamically adjust the transmission power with the environment change. All of our experiments are implemented on the MICAz platform. The experimental results show that our algorithm can save power energy and guarantee a good link quality for each pair of communications.

Keywords: energy consumption, power control, power saving, wireless networks, sensor networks

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Received October 16, 2007; revised March 3, 2008; accepted April 10, 2008.
Communicated by Yu-Chee Tseng.
* This work was supported by the National Science Council of Taiwan, R.O.C., under grant No. NSC 96-2221- E-007-174.