A method of operating a communications device (104, 260, 270) for communicating data via a wireless communications network, the method comprising detecting one or more of a plurality of beams of radio signals transmitted by the wireless communications network, the one or more beams of the radio signals which have been detected forming a set of one or more detected beams of radio signals from the plurality of beams of radio signals transmitted from the wireless communications network, identifying a sub-set of the set of one or more detected beams of radio signals which can be used to receive data carried by the radio signals of the beam, wherein the beams of said sub-set are beams of the set of one or more detected beams of radio signals for each of which the received signal strength of the radio signals of the beam exceeds a first evaluation threshold, entering a relaxed radio measurement state in which the communications device reduces an amount of attempted measurements of the plurality of beams of radio signals compared with a normal state according to one or more relaxed measurement state criteria, and when in the relaxed radio measurement state, determining a reference measurement level based on a signal strength of the radio signals of the sub-set of the set of one or more detected beams of radio signals, determining, after determining the reference measurement level, a current measurement level based on a signal strength of the radio signals of the sub-set of the set of one or more detected beams of radio signals having a signal strength which exceeds the first evaluation threshold, and determining whether the communications device should remain in the relaxed radio measurement state by comparing a difference between the reference measurement level and the current measurement level with a delta threshold (288, 345), wherein the delta threshold is set dynamically by the communications device according to a number of the detected beams of the radio signals in the set of one or more detected beams of radio signals. detecting one or more of a plurality of beams of radio signals transmitted by the wireless communications network, the one or more beams of the radio signals which have been detected forming a set of one or more detected beams of radio signals from the plurality of beams of radio signals transmitted from the wireless communications network, identifying a sub-set of the set of one or more detected beams of radio signals which can be used to receive data carried by the radio signals of the beam, wherein the beams of said sub-set are beams of the set of one or more detected beams of radio signals for each of which the received signal strength of the radio signals of the beam exceeds a first evaluation threshold, entering a relaxed radio measurement state in which the communications device reduces an amount of attempted measurements of the plurality of beams of radio signals compared with a normal state according to one or more relaxed measurement state criteria, and when in the relaxed radio measurement state, determining a reference measurement level based on a signal strength of the radio signals of the sub-set of the set of one or more detected beams of radio signals, determining, after determining the reference measurement level, a current measurement level based on a signal strength of the radio signals of the sub-set of the set of one or more detected beams of radio signals having a signal strength which exceeds the first evaluation threshold, and determining whether the communications device should remain in the relaxed radio measurement state by comparing a difference between the reference measurement level and the current measurement level with a delta threshold (288, 345), wherein the delta threshold is set dynamically by the communications device according to a number of the detected beams of the radio signals in the set of one or more detected beams of radio signals.