Abstract:

Due to numerous nodes, diverse scenarios and limited resource, wireless sensor networks are featured in complicated distribution, flexible networking and highly dynamic state, the clusterbased network management is facing how to energyefficiently maintain the structure of clusters for different situations. A multimode cluster maintenance mechanism is proposed to meet diverse demands of maintenance of clusters, which focuses on the target of adaptive, local and ondemand maintenance of clusters, the operations of maintenance of clusters are done according to the dynamically changed network in time and space fields, it transforms the maintenance of clusters into local and eventtriggered operations, the triggers include the residual energy of cluster head lower than a set threshold, the outofbalance loads of cluster heads, new node joining a cluster or disable nodes, etc. The program of maintenance for single cluster (innercluster) or multi clusters (interclusters) 〖JP2〗is initiated according to the damaged single cluster or neighboring ones. The results of simulation based on NS2 show that the proposed methods can significantly reduce cost of network maintenance, effectively balance the energy consumption among nodes, increase the sum of transmitted data and prolong lifetime of the network 1.8 times at most under 100% survived nodes compared with the traditional periodic wholenetwork reclustering method.