Abstract:

In order to address the problems of network topology change caused by node mobility, new nodes joining network, some nodes exiting the network and node failure that impacted on network performance in mobile wireless sensor networks (MWSN). A power adaptation based  topology maintenance algorithm (PATMA) is proposed. In the PATMA, the energy consumption of the transmission unit bit data packet is used as the condition for selecting relay nodes. The nodes maintain connectivity with distant neighbor nodes through the relay nodes. When the topology changes, the nodes maintain the network connectivity by adjusting the transmit power adaptively. Meanwhile, different events are defined based on the causes of the topology change. Different maintenance strategies are adopted when the events are detected by the nodes. Finally, the simulation results show that the performance of the PATMA algorithm is significantly improved compared with the new adaptive power control (NAPC) algorithm and the topology control (XTC) algorithm in average transmit power, network connectivity degree and number of live nodes in the network.