Time synchronization algorithm of wireless sensor networks based on data aggregation tree

Time synchronization is a critical technique of wireless sensor networks (WSNs). Aimed at the disadvantages of hierarchical time synchronization algorithm, this paper proposes an improved algorithm used for WSNs based on data aggregation tree. Based on collection and selection principles of multiple time data point tuples, the relative time drift and phase offset of the node are calculated through linear programming method, and time synchronization is achieved eventually during the establishment of data aggregation tree. Performance analysis and simulation results prove that, compared with the existing time synchronization algorithms, the proposed algorithm can reduce the energy cost of nodes and shorten the time of synchronization effectively.