The present invention is related to cellular radio communication network and a method and apparatus for ranking a set of neighbor cells associated with a first cell in the cellular radio communication network. For each cell member in said neighbor cell set, handover statistics reflecting how frequent said cell member is involved in handovers aiming at modifying active sets including at least said first cell to include said cell member are registered (301). Based at least in part on the registered handover statistics for the different cell members in the set of neighbor cells, the cell members of said set of neighbor cells are ranked (302). The invention also includes a method for controlling mobile station measurements wherein neighbor cells are selected for inclusion in a monitored set based on said ranking.