Clustering provides an effective way to extend the lifetime and improve the energy efficiency of wireless sensor networks (WSNs).\r\nHowever, the cluster heads will deplete energy faster than cluster members due to the additional tasks of information collection\r\nand transmission. The cluster head rotation among sensors is adopted to solve this problem. Cluster head rotation strategies can\r\nbe generally divided into two categories: time-driven strategy and energy-driven strategy. The time-driven strategy can balance\r\nenergy consumption better, but it is not suitable for heterogonous WSNs. The energy-driven cluster head rotation strategy has\r\nhigh energy efficiency, especially in heterogonous networks. However, the rotation will become increasingly frequent with the\r\nreduction of the nodes residual energy for this strategy, which causes lots of energy waste. In this paper, we propose a hybrid cluster\r\nhead rotation strategy which combines the advantages of both energy-driven and time-driven cluster head rotation strategies. In\r\nour hybrid rotation strategy, the time-driven strategy or energy-driven strategy will be selected according to the residual energy.\r\nSimulations show that the hybrid strategy can enhance the energy efficiency and prolong network lifetime in both homogeneous\r\nand heterogeneous networks, compared with either single time-driven or energy-driven cluster head rotation method.
Loading....