• Roshan Lal
• Kanika Sharma

Wireless Sensor Network (WSN) deals with various wireless sensor nodes that are deployed in the targeted areas for sensing the surrounding. The sensed data is forwarded to the sink or base station for further required operation. The one of the significant concern that WSN suffers from is the limited battery constraints. Therefore, in this paper, various heterogeneous protocols are discussed that enhances the efficiency of the network to a great level. This paper aims to study the various methods that are adopted by some important studies available in the literature so far. As we know, it is the routing that decides the fate of the wireless senor node; therefore, the extensive review of these studies given in this paper will help the researchers to develop a new technique. While discussing about various routing protocols, the important concern of clustering is highlighted. Clustering proliferates the scalability of the network and also reduces the number of transmission from the sensor nodes. Therefore, this paper also aims to highlight the cluster head selection methods existing in the heterogeneous WSN. Furthermore, a significant insight to the various optimization methods is also being discussed to give a new direction to the researchers for developing new energy efficient protocol

Wireless Sensor Network, heterogeneous routing protocols, Clustering, Cluster head selection, optimization.

"A deep insight into heterogeneous routing protocols in Wireless Sensor Network", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.190-195, May-2019, Available :http://www.jetir.org/papers/JETIR2002230.pdf

"A deep insight into heterogeneous routing protocols in Wireless Sensor Network", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp190-195, May-2019, Available at : http://www.jetir.org/papers/JETIR2002230.pdf