Efficient routing mechanisms used for network lifetime enhancement in wireless sensor network

The distribution of sensors in the environment that are wireless in nature used to sense the information, gather the information, and communicate with other sensors and information like pressure, temperature, humidity, intrusion etc is received by sink is basic work done in wireless sensor network. There are many challenges faced by wireless sensor networks one of the major problems is battery consumption. There are so many techniques like clustering that are used for transmission of data as the data transmission is the most energy consuming task in sensor network. The nodes are of small size so is the battery and it causes the drainage of battery at a fast rate. In this paper we will discuss some of energy efficient protocols that have been used previously.