A Chaining Selective Wakeup Strategy for a Robust Continuous Object Tracking in Practical Wireless Sensor Networks

The selective wakeup scheme is the energy saving mechanism that is used for an object detecting or tracking in wireless sensor networks. Recently, many protocols are proposed using the selective wakeup scheme for the continuous objects tracking such as forest fires, poison gas, and oil spills. They predict the future shape of the continuous objects and activate only sensors in the predicted boundary area of the objects. It works normally in a uniformly deployed wireless sensor networks. However, it cannot be directly applied to a randomly deployed practical sensor networks with void areas. When a void area is around the boundary area, the activation message cannot reach to the next activation area and the activation control will be fail. Moreover, if activation control is once foiled then the next activation control might be failed continuously. It leads to many detection errors for continuous object. The detection errors can be result in serious harm to people, because most of continuous objects are dangerous substances. In this paper, we propose a chaining selective wakeup scheme for robust continuous object tracking in wireless sensor networks. In our protocol, we collect the information of a void area during the network configuration time, if the next boundary area is in the void area, we activate the chained area surrounding the void area with activation control message. Simulation results show the better performance than the previous studies in terms of success ratio of continuous objects detection and tracking.