IEEE 802.15.4 is an emerging communication protocol for Low Rate-Wireless Personal Area Network (LR-WPAN) which has gained importance in last few years, in practical and research field. Now-a-days, Zigbee used in many applications such as home automation, industrial, medical system etc. The low rate WPANs provide low power consumption, low cost and small range wireless networking. Zigbee uses IEEE 802.15.4 as its communication protocol for Medium Access Control (MAC) layer and PHYsical (PHY) layer. Since in WSNs, nodes are powered by limited capacity of batteries and densely deployed in any geographic region to perform sensing.