A Research on Age of Information Minimization Scheme of Wireless Sensor Network Assisted by UAV
Yuhua Zhao, Jia Xiangdong, Wang Yuxin, Cao Shengnan · 2021
Aiming at the problem of information freshness in the process of massive data processing in wireless sensor networks, this paper proposes the system AoI (Age of Information, AoI) based on the constraints of drone flight speed, altitude, collision avoidance, and reliable transmission. A non-convex optimization strategy for AoI minimization that combines acquisition point selection, trajectory optimization and power control. Taking a scene of multiple drones communicating with multiple sensor nodes at the same time under the same frequency band as the object, the information acquisition process of multiple drones in three-dimensional space is simulated and verified. Through the SCA (Successive Convex Approximation, SCA) optimization algorithm, the established non-convex problem is transformed into a convex optimization problem to be solved, and the optimal hover position, hover time and transmission power during the flight of the UAV are obtained. The experimental results show, The optimal solution obtained by the scheme can effectively minimize the system AoI.