A method for assessing a quality state of a radio link between a user equipment and a base station, comprising: obtaining a signal index that identifies within a reference signal discovery window a plurality of candidate time slots during which a reference signal may be sent by the base station; determining whether the base station was authorized, as a result of a procedure that determines the availability of a radio channel, to access to the radio channel during at least one first frame, wherein the determination is based on the reception or absence of reception during said at least one first frame of a downlink configuration signal from the base station; identifying, among the plurality of candidate time slots, a target time slot; assessing the quality state of the radio link on the basis of a power measurement performed during the target time slot only if the determination is positive.