The invention relates to a hierarchical radio network operations system (OS) and a method for controlling a mobile communications network by a hierarchical radio network OS, the hierarchical radio network OS comprising at least one radio network OS on a subordinate level and a radio network OS on a superior level, wherein after a controlling action is initiated a demand for data depending on the controlling action is forwarded from the superior level OS to at least one subordinate level OS. The latter in response to the call forwards the demanded data to the radio network OS on the superior level.