290 / 2024-03-14 21:29:47

An Energy Management Strategy Based on Depth Adjustment for Underwater Wireless Sensor Networks

Energy Management,Depth Adjustment,Underwater Wireless Sensor Networks

4、智能化装备技术 > 7、装备安全监测监控技术

Underwater wireless sensor networks can monitor marine. However, two objectives must be achieved before employing underwater wireless sensor networks. Firstly, the nodes need to achieve long-term work. Secondly, the network’s performance needs to be guaranteed, such as connectivity and coverage. Current energy can be harvested to replenish node energy. However, currents are unevenly distributed in the vertical direction. The current energy decreases with depth. To achieve the first objective, the nodes are designed to autonomously adjust their depth and harvest current energy to recharge themselves. Although nodes can move to harvest energy, the network coverage will be reduced during node movement. Therefore, nodes need to be scheduled to ensure that the network energy is balanced and the network coverage meets the requirements. Furthermore, due to the special characteristics of the marine environment, nodes are more prone to failures, resulting in holes in network coverage. In order to address the above issues, an energy management strategy based on a depth adjustment mechanism is proposed. The strategy is realized in three steps: (a) the network deployment method is determined based on the node sensing model. (b) the network regular working strategy, an improved-GAF-clustering routing protocol, are determined. The strategy is used for the network daily patrol. (c) the collaborative repair strategy for network fault is determined. The strategy applies to the case where nodes fail. The strategy enhances the network's ability to tolerate faults. The results showed that, the network enables long-term work and the network performance is guaranteed by using the proposed energy management strategy.