1. A network element for collecting diagnostic data in a wireless communication network, the network element comprising: a memory configured to store previously measured results of the diagnostic data for improving quality of wireless communications in the wireless communication network; and at least one processor operably connected to the memory, the at least one processor configured to: identify spatiotemporal correlations based on a spatiotemporal correlation model derived from the previously measured results of the diagnostic data in accordance with a data collection strategy that indicates particular position and time of collection of the diagnostic data associated with the wireless communications; and collect new diagnostic data based on the spatiotemporal correlation model and the data collection strategy.