Date Added: Jun 2010
One of the main research problems in the area of wireless sensor network has been to prolong life-time of network by using energy efficient algorithms. Sensor nodes in WSNs has different energy consumption rate due to the uneven complexity of the sensing tasks and varying distance from sink node. Consequently this leads to fast energy disparity among the sensor nodes and unbalanced energy state in the network, which in turn result in short lifetime of the network. Therefore balancing energy consumption, in order to prolong network lifetime has become an important aim for WSNs.