1. A network element for collecting diagnostic data in a wireless communication network, the network element comprising: a memory storing previously measured results of the diagnostic data for improving quality of the wireless communication network; and at least one processor operably connected to the memory, the at least one processor configured to: determine a spatiotemporal correlation model based on the previously measured results of the diagnostic data in accordance with a data collection strategy; and collect new diagnostic data based on the determined spatiotemporal correlation model and the data collection strategy.