• Sangeeta
• Saurabh Yadav

The field of Wireless sensor networks is the main attraction of various researchers due to its practical applications in daily life. It comprises of sensor nodes geographically distributed over an area, which sense the environmental conditions like temperature, humidity etc and pass this information to the sink .As these nodes are non-rechargeable means energy constrained, so main focus of the researches in this field is to make it energy efficient as par as possible and prolong its network lifetime .Clustering is one of the hierarchical routing technique which is used to make the network energy efficient. It can be further improved by adopting non-uniform cluster size techniques and sub-clustering in farther as well as larger clusters. Cluster heads of distant clusters will need to communicate with only sub-cluster heads which further covers the entire cluster members. This proposed model effectively improves lifetime over LEACH.

Wireless Sensor Networks, effective lifetime, sub- clustering, cluster head and residual energy.

"Non-uniform hierarchical clustering method for improving lifetime of energy constrained Wireless Sensor Networks", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 8, page no.581-585, August - 2018, Available :http://www.jetir.org/papers/JETIR1808985.pdf

"Non-uniform hierarchical clustering method for improving lifetime of energy constrained Wireless Sensor Networks", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 8, page no. pp581-585, August - 2018, Available at : http://www.jetir.org/papers/JETIR1808985.pdf