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In this paper a new criterion called Energy-Cost Function is presented according to which in each round the energy cost for any individual node is calculated. When transmitting their data, the nodes make decisions based on this very cost function. In case the nodes decides that it will cost a lower amount of energy transmitting the data to the sink by itself rather than by the cluster-head to the sink, then the node transmits the data directly. In this way the cluster overload is reduced and both the network lifetime and instability period is boosted. Based on the conditions of the problem, cost function parameters are variable and since all the decisions are made locally, network scalability potential is retained. Simulation results show that the network lifetime or its instability period based on the cost function employed will be improved up to 40% in relation to the LEACH protocol. |
