Wireless Sensor Network (WSN) plays a significant role in wireless communication. Event-Driven Wireless Sensor Networks (EWSNs) are special cases of WSN in which numerous nodes are placed in such a way that nodes start generating and propagating data packets when an event of interest occurs. For event monitoring in EWSNs, we have to solve two problems, one is the accurate event detection, the other is the reliable and fast transmission. Design of a protocol for this purpose should be such that it should identify the event occurrence and providing emergency routing based on the detected event should be done as fast as possible. Fast, Reliable and Efficient event-Detecting (FREED) protocol fits well in this situation. To evaluate the performance of the freed protocol with the existing system, Network simulator (NS-2) is used .

1. I. F. Akyildiz, W. Su, Y. Sankarasubramanian, and E. Cayirci,"A survey on sensor networks",IEEE Commun. Mag. , vol. 40, no. 8, pp. 102-114, August, 2002.
2. O. B. Akan and I. F. Akyildiz, "Event-to-sink reliable transport in wireless sensor networks," IEEE/ACM Trans. Networks, vol. 13, no. 5, pp. 1003–1016, Oct. 2005.
3. Ali. M, Fazard. T, Mohammad. H. Y. M, Mohsen . T. H, "EELLER: Energy-Low Latency Express Routing for WSNs", IEEE,vol. 3, pp. 334-339, 2010.
4. Deepali Virmani, Stabirjain, "Reliable Robust and Real-Time Communication Protocol For Data Delivery in Wireless Sensor Networks", International Journal of Information Technology and Knowledge Management ( IJITKM) , vol. 4, pp. 595-601,July- Dec. 2011.
5. T. He, J. Stankovic, C. Lu, and T. Abdelzaher, "Speed: A stateless protocol for real-time communication in sensor networks," in Proc. 23rd Int. Conf. Distr. Comput. Syst. , May 2003, pp. 46–55.
6. Jiang. B, "End-To-End Delay Analysis For Event-Driven Wireless Sensor Network Applications", a preliminary proposal submitted for Doctor Of Philosophy ,Computer Engineering, Virginia Polytechnic Institute And State University, Blacksburg, Virginia,May 4, 2009.
7. B. Karp and H. T. Kung, "GPSR: Greedy perimeter stateless routing for wireless networks," in Proc. MobiCom, Boston, MA, Aug. 2000, pp. 243–254.
8. K. C. Krishnapriya and Sebastian Terence , " A Survey on Event Detection and Transmission Protocols in an Event Driven Wireless Sensor Network", International Journal of Computer Applications (0975 – 8887) Volume 58– No. 4, November 2012.
9. A. V. U. P. Kumar, A. M. V. Reddy, and D. Janakiram, "Distributed collaboration for event detection in wireless sensor networks," in Proc. MPAC, Grenoble, France, Nov. 2005, pp. 1–8.
10. M. Lucchi and M. Chiani, "Distributed detection of local phenomena with wireless sensor networks," in Proc. ICC, Cape Town, South Africa, May 2010, pp. 1–6.
11. Lulu Liang, Deyun Gao, Hongke Zhang, and Oliver W. W. Yang,"Efficient Event Detecting Protocol in Event-Driven Wireless Sensor Networks", IEEE Sensors Journal, Vol. 12, No. 6, June 2012.
12. Lulu Liang, Qi Zou, Guang Yang, Lei Shi, "Security Issues and Challenges in Event-Driven Wireless Sensor Networks", Proceedings of the 2012 2nd International Conference on Computer and Information Application (ICCIA 2012), ISBN (on-line): 978-94-91216-41-1
13. C. Siva Ram Murthy and B. S. Manoj, AdHoc Wireless Networks: Architectures and protocols, Prentice Hall PTR,2004,ISBN 978-81-317-0688-6
14. H. X. Tan, M. C. Chan, W. D. Xiao, P. Y. Kong, and C. K. Tham, "Information quality aware routing in event-driven sensor networks," in Proc. INFOCOM, San Diego, CA, Mar. 2010, pp. 1–9.
15. L. J. G. Villalba , A. L. S. Orozco. A. L. S. , A. T. Cabrera and C. J. B. Abbas,(2009) , "Routing Protocols in Wireless Sensor Networks" Sensors-Open Access Journal Sensors (ISSN 1424-8220; CODEN: SENSC9),2009, 9, 8399-8421; doi:10. 3390/s91108399.
16. Y. Xue, B. Ramamurthy, and Y. Wang, "Providing reliable data transport for dynamic event sensing in wireless sensor networks," in Proc. ICC, Beijing, China, May 2008, pp. 3146–3150.

Event-driven Wireless Sensor Networks (ewsns) Event-detection.