An exemplary method is performed by a distributed unit of a base station. The base station further comprises a centralized unit. The method comprises: determining (1302) inactivity of one or more data radio bearers, established between the distributed unit and a user equipment, for carrying user data; determining (1304) a level of activity of one or more signalling radio bearers, established between the distributed unit and the user equipment, for carrying control data; and determining (1306), based on the level of activity of the one or more signalling radio bearers, whether to transmit, to the centralized unit, a report message comprising an indication of the activity of the one or more data radio bearers.