Sink node redeployment technique for upgrading Network Lifespan in Wireless sensor networks
P. Prakasam, N. Kayalvizhi · 2014
Sensor nodes in Wireless Sensor Networks (WSNs) are normally battery-powered and remain stationary after initial deployment. Sensor nodes direct the sensed data back to sink via multihop links. While reporting tasks, sensor nodes nearby the sink will consume more battery power than other sensor nodes for forwarding their own sensed data and others data; subsequently battery power of these nodes will drain out early and cut down the network lifespan. Sensor nodes will no longer provide sensing and data processing, If it runs out of energy. Due to the routing path re-allocation and failure of sensing and reporting events in the environment, this can lead to a huge loss in the network. Hence energy conservation has been getting increased consideration in WSN research workings. The concept of mobile sink has been recently introduced for WSNs in order to improve the network lifespan and overall performance of WSNs as it moves the burden of energy consumption from the sensor nodes to sink nodes, which are usually considered to have unconstrained energy source and greater computational power. In this survey, we present various moving strategies, which are mainly focuses on selecting appropriate position for relocating sink based on the residual energy of the sensor nodes in the wireless sensor networks. This survey provides a thorough analysis of the metrics supported by each technique during sink relocation and presents the limitations of these techniques.