There is provided a method for a mobile communication system comprising receiving at a communication device cell configuration information from a network node, and the configuration information being related to cells in a network area comprising a first cell and one or more second cells. Further, the method further comprises receiving at the communication device environment information indicative of overlaps between coverage areas of the first cell and the one or more second cells, and causing transmission of measurement results obtained in the first cell for use in radio resource management of the communication device in the one or more second cells.