A method is provided for identifying an anomaly in a communications network, the communications network covering a geographical area. The method comprises defining a plurality of regions within the geographical area. A measurement of a network performance characteristic is received from a user equipment, UE, connected to the communications network. The measurement is associated with a geographical location. A region of the plurality of regions which contains the geographical location is identified, and it is determined that there is an anomaly in the communications network within the identified region.