A mobile communication network, particularly a simulcast GSM network, is enabled to obtain extra information about the radio links between the mobile stations (4) and the base transceiver stations (8) by generating and aborting a radio resource management process and then measuring radio link parameters such as signal level or signal quality associated with such control signals. Actual handover is prevented by the abortion but when sufficient data has been obtained the measurements are collated and used to determine the optimum cell and/or channel for handover. Both uplink measurements and downlink measurements can be obtained.