A method for preparing handover of a mobile device from a serving base station in a radio communications system, includes sending an identity indicator of the mobile device, from the serving base station to a plurality of neighboring bases stations; receiving, from at least a subset of said neighboring base stations, detection data representing the respective base station's ability to detect the mobile device; sending cell identity data, from the serving base station to the mobile device, representing at least candidate base stations for the mobile device to monitor.