摘要：Network lifetime is an important index to measurethe performance of wireless sensor networks (WSNs). Due tothe limited energy of nodes in WSNs, prolonging the networklifetime becomes the priority problem in the design of thenetwork. In this paper, we deeply research how to prolong thelifetime of WSNs. Firstly, the node lifetime model in WSNs isstudied. Then through using the fitness model for scale-freetopology in WSNs, a scale-free topology BNL (Based on theNode Lifetime) for prolonging network lifetime is obtained.Finally, the node degree of the model which obeys thepower-law distribution is verified theoretically. The simulationresults show that the topological structure based on theevolution of the scale-free network has good fault tolerancecharacteristics. And it also can balance the network energyconsumption and prolong the network lifetime. .
关键词：wireless sensor networks; scale-free; the network lifetime; the residual energy
