Wireless sensor network consists of hundreds or thousands of micro sensor nodes, networking together, allows user to accurately monitor a remote environment intelligently combining the data from the individual nodes. The main issue in WSN is energy limited characteristic of the sensor node. So the problem is to have the routing protocol in such the manner that it should be energy efficient in order to increase the life span of the whole WSN. One of the most critical issues in wireless sensor networks is represented by the limited availability of energy on network nodes; thus, making good use of energy is necessary to increase network lifetime. In this paper we design a routing protocol with named PECH. This protocol is base station assisted i. e. this protocol utilizes a high-energy base station to set up clusters and routing paths, perform randomized rotation of cluster heads, and carry out other energy-intensive tasks. However using a central control algorithm to form the clusters produces better clusters by dispersing the cluster head nodes throughout the network. So, in terms of power it will be highly power efficient. It is centralized since in this protocol, rather than self-configuration, base station is used (that is centralized located in the sensor field). Lastly, the new protocol PECH will be compared with centralized protocol SHPER

1. P. Havinga, G. Smit, "Design Dechniques for Low-Power Systems", Journal of Systems Architecture, vol. 46 no. 5, 2000, pp. 1–21.
2. V. Raghunathan, C. Schurgers, S. Park, M. Srivastava, "Energy Aware Wireless Micro sensor Networks", IEEE Signal Processing Magazine, vol. 19, 2002, pp. 40–50.
3. R. Min, A. Chandrakasan, "A Framework for Energy -Scalable Communication in High-Density Wireless Sensor Networks", Proceedings of the ACM Int. Symposium on Low Power Electronics and Design, 2002, pp. 36–41.
4. D. Steere, A. Baptista, D. McNamee, C. Pu, and J. Walpole, "Research Challenges in Environmental Observation and Forecasting Systems", in Proc. 6th Int. Conf. Mobile Computing and Networking (MOBICOMM), 2000, pp. 292–299.
5. W. B. Heinzelman, A. P. Chandrakasan, and H. Balakrishnan, "An Application-Specific Protocol Architecture for Wireless Microsensor Networks", IEEE Trans. Wireless Commun. , vol. 1, no. 4, Oct. 2002, pp. 660–70.
6. D. Kandris, P. Tsioumas, A. Tzes, N. Pantazis, and L. D. Vergados, "Hierarchical Energy Efficient Routing in Wireless Sensor Networks", 16th Mediterranean Conf. on Control and Automation Congress Centre, Ajaccio, France, June 25- 27, 2008.
7. D. Kandris, P. Tsioumas, A. Tzes, N. Pantazis, and D. D. Vergados, "Hierarchical Energy Efficient Routing in Wireless Sensor Networks", 16th Mediterranean Conference on Control and Automation Congress Centre, Ajaccio, France, 25-27 June 2008, pp. 1856-61.
8. A. Manjeshwar and D. P. Agarwal, "TEEN: A Routing Protocol for Enhanced Efficiency in Wireless Sensor Networks", in 1st Int. Workshop on Parallel and Distributed Computing Issues in Wireless Networks and Mobile Computing, San Francisco, USA, April 2001.
9. A. Manjeshwar, and D. P. Agrawal, "APTEEN: A Hybrid Protocol for Efficient Routing and Comprehensive Information Retrieval in Wireless Sensor Networks", in Proc. of the 2nd Int. Workshop on Parallel and Distributed Computing Issues in Wireless Networks and Mobile computing, Ft. Lauderdale, FL, USA, April 2002.

Sensor Sensor Network Routing