Wireless Sensor Networks can accumulate decisive and precise information in inaccessible and precarious environments, and can be utilized in Military Affairs, National Defence, Environmental Monitor, Industrial Control, Traffic Management, Smart Home, Medical Care, and many more. The sensors whose resources are inadequate are inexpensive, and rely upon the battery for supplying electricity, so it is very important for routing to conveniently make use of its power. Earlier, for wireless sensor networks an energy-efficient SHAC (Single-Hop Active Clustering) approach was proposed. This algorithm has mainly three parts. First, a timer mechanism was introduced to choose tentative cluster-heads. Second, a cost function was proposed for balancing efficiently energy of each node. Lastly, active clustering algorithm was proposed. During both numerical results and theoretical analysis, it is depicted that with such algorithm the lifetime of the network can be increased considerably compared to the other clustering protocols namely LEACH-C and EECS. Single Hop Active Clustering may extend the lifespan of the network by up to 50 percent as compared to EECS.
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