A method in a base station for assisting a network management unit in managing a cellular network is provided. The base station determines a status of the cellular network. The status affects a measurement of a quality of a radio channel between the base station and a user equipment comprised in the cellular network. The measurement is to be performed by the user equipment. The base station receives a feedback report from the user equipment comprising the measurement. The base station evaluates a validity of the measurement based on the determined status. The base station sends a report to the network management unit. The report comprises an indication of the measurement and an indication of the validity, thereby assisting the network management unit in managing the cellular network.