[Gupta*et al., 5(9): September, 2016] ISSN: 2277-9655 IC™ Value: 3.00 Impact Factor: 4.116 http: // www.ijesrt.com© International Journal of Engineering Sciences & Research Technology [390] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY ENERGY EFFICIENT LEACH PROTOCOL IN WSN Swati Gupta * , Gaurav Banga * Research Scholar, Master of Technology, ECE Department, GIMT, KKR, India Assistant Professor, ECE Department, GIMT, KKR, India DOI: 10.5281/zenodo.154218 ABSTRACT A sensor node hold small amount of resources in terms of processor, battery power, memory and communication range, but when a huge number of sensor nodes work together they are able to complete a good volume of task. It is just because of Wireless Sensor Network we are able to cooperate with physical world directly. In this context, hierarchical routing protocols offer energy-efficiency, scalability and reliability for WSN applications. With this goal in mind, this paper proposes to approve a Cluster-based approach for Energy-efficiency in the WSN (REER)protocol. The main purpose of REER is to provide energy-efficiency by using for cluster formation and a probability function for Cluster Head election. Simulations were conducted to show the benefits of REER compared with LEACH. KEYWORDS: LEACH Protocol, DD Leach ,S Leach, REER INTRODUCTION Wireless Sensor Networks (WSNs) [1] are networks of light-weight sensors that are battery powered consumed majorly for monitoring purposes. WSNs are growing equipped to handle some of these complex functions, in- network dispensation such as data aggregation, information fusion, computation and transmission activities requires these sensors to consume their energy efficiently in order to extend their effective network life time. Sensor nodes are ready to energy drainage and failure, and their battery source might be irreplaceable, instead new sensors are deployed. Thus, the stable re-energizing of wireless sensor network as old sensor nodes die out and/or the uneven terrain of the scope being sensed can lead to energy imbalances or heterogeneity among the sensor nodes. This can negatively impact the stability and execution of the network system if the extra energy is not properly utilized and leveraged. Various clustering schemes and algorithm such as LEACH, DEEC, have been proposed with varying objectives such as load equilibrate, fault- tolerance, increased connectivity with reduced delay and network longevity. In recent years wireless sensor networks (WSNs) [2] has gained much attention due to the increase demand in the field of medicine, battle fields, identification of contaminated environments, environmental monitoring, analysis of structural conditions of buildings, roads and highways etc. These networks are distributed embedded system consisting of large collection of short range sensor nodes collectively work together to monitor a system or an environment. These nodes will sense, and gather information from the environment or system and transmit the data to Base Station. The nodes consist of the sensor module which senses the environment, the processor and memory which perform local computation on the sensed data and store data, the transceiver responsible for exchange information with neighbour nodes and a power supply unit for node’s energy. This node architecture is shown in Figure 1.