An apparatus and a system comprising at least one power integrator, method performed by an apparatus comprising at least one power integrator and computer program product for causing an apparatus comprising at least one power integrator to perform: receiving a measure of power level of at least one radio beam detected by an antenna array comprising a plurality of antenna elements, accumulating the received measure of power level over a period of time, determining a representative output signal corresponding to the accumulated measure of received power level and providing the representative output signal to a controller.