Rapid advances in wireless communication technology recently have led to the development of sensor nodes to form wireless sensor network (WSN). However, these nodes have limited battery power and due to the nature of this technology which enables communication between nodes which can be deployed anywhere including hard-accessed area, thus it is not feasible to recharge or replace the batteries. Therefore power consumption of each sensor node should be minimized so that overall network lifetime will be increased. In order to minimize power consumption, some nodes which can be considered redundant, can be put to shutdown mode. In this paper, a shutdown technique is being proposed. The technique is Random Node Shutdown. In this technique, nodes are randomly shutdown according to the criteria and conditions defined. This technique is examined and simulated using the NS2 simulation environment to find the best scenario for the proposed algorithm.

1. K. Akkaya and M. Younis, 2005, A survey of routing protocols in wireless sensor networks. In the Elsevier Ad Hoc Network Journal, Vol. 3/3 pp. 325-349. .
2. I. F. Akyildiz et al. ,March 2002. Wireless sensor networks: a survey, Computer Networks, Vol. 38, pp. 393-422.
3. I. F. Akyildiz, W. Su, Y. Sankarasubramaniam, and E. Cayirci. Aug 2002. A survey on sensor networks, IEEE Communications Magazine, Vol. 40, Issue 8, pp 102-114,
4. Marcel Busse,2004. Wireless sensor network, http://www. informatik. uni-mannheim. de/pi4/projects/wsn/.
5. Chahboun, A. , Raissouni, N. , Essaaid, M. ,2005, Towards an operative land surface temperature in-situ measurements system for remote sensing models validations, IEEE International, Volume 4, pp 2496-2499.
6. Lei Zhao, Chaonong Xu, Yongjun Xu, Xiaowei Li,2007. Energy-aware system design for wireless sensor network, Institute of Computing Technology. Chinese Academy of Sciences, Beijing, 2007.
7. Vijay Raghunathan, Curt Schurgers, Sung Park, and Mani B. Srivastava,2000. Energy aware wireless sensor networks, Department of Electrical Engineering, University of California, Los Angeles.
8. The Network Simulator – ns-2, 2005,http://www. isi. edu/nsnam/ns/.
9. W. R. Heinzelman, A. Chandrakasan, and H. Balakrishnan, 2002, Energy-efficient communication protocol for wireless microsensor networks. In IEEE Hawaii International Conferenceon System Sciences, Vol 2, pp 10.
10. R. Shah and J. Rabaey,2002 Energy aware routing for low energy ad hoc sensor networks. In the Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC), Orlando, FL, Vol 1, pp 350-355.
11. C. Schurgers and M. B. Srivastava,2001,Energy efficient routing in wireless sensor networks. In the MILCOM Proceedings on Communications for Network-Centric Operations: Creating the Information Force, McLean, VA, Vol. 1, pp 357-361.
12. Razatulshima Ghazali,2006. Security in wireless sensor networks In Enhance AODV Routing, Universiti Teknologi Malaysia.

Wireless Sensor Network Energy Efficiency Power Cycle Node Shutdown