Dynamic Overlay Construction for Mobile Target Detection in Wireless Sensor Networks
葉家延, Chia-Yen Yeh · 2014
In battlefields, the wireless sensor network can be used to detect targets and to collect data. However, the mobility of targets and sinks creates challenges for the design and implementation of the system. While there are research proposals capable of handling multiple mobile sinks, these protocols either assume the knowledge of locations of sinks or create too many flooding messages, leading to a fast battery drain. To deal with this issue, we propose a framework, called Dynamic Overlay Construction (DOC), for data collection in wireless sensor net- works. In our framework, we take the structure advantages of both grid and tree to route queries and to deliver data efficiently. In addition, two mechanisms are introduced to balance the load in the network. The first one helps to distribute the tasks more evenly; and the second one adjusts the size of grids to balance the traffic load in each grid. Lastly, an improved query aggregation is proposed to reduce the query response time and the traffic associated with each query. The simulation results show that DOC outperforms the better known data collection solutions for wireless sensor networks with multiple mo- bile sinks but the best known data collection solutions with multiple mobile targets.