Review on Relay Node Placement Techniques to Increase System Capacity in WSN

Abstract- A wireless sensor network consists of sensor nodes which are capable to perform sensing, computation and transmission. These sensor nodes have limited battery power which is difficult to replace due to hostile environment. Therefore to increase the lifetime of wireless sensor network, it is required to develop such techniques to consume lesser energy. Less consumption of overall energy of the network results in increase in the system capacity. One of these techniques is to deploy some relay nodes to communicate with the sensor nodes, other relay nodes and the base stations. The relay node placement problem for wireless sensor networks is concerned with placing the minimum number of relay nodes into the wireless sensor network to meet certain connectivity requirements Index Terms –wireless sensor networks (WSN), sensor node, relay node placement, direct communication, Amplify and forward, decode and forward, system capacity I