Time synchronization of a plurality of different wireless networks with data sensors

The present invention relates to synchronizing a plurality of different wireless networks A, B of the method for time, each wireless network (A, B) comprising at least one data sensor for measuring data (A.1, A.2, A. 3, A.4, B.1, B.2, B.3, B.4) and the measured data are sent to the gateway (A.0, B.0), which was used to all relevant network ( common time management tool a, B) broadcasting time synchronization messages (TM). Thus, in a simple, effective and reliable way to achieve time synchronization of multiple different wireless networks (A, B) possible.