An operating method of a user equipment that is configured to exchange signals with network nodes of a cellular radio access network, the method comprising - the user equipment being connected to at least one cellular radio access network via at least one first radio link, using a first set of operating parameters that are associated with the at least one first radio link; - the user equipment performing a measurement of a quantity that is indicative of a current operating temperature of the user equipment or performing a predetermined sequence of at least two such measurements; - the user equipment determining whether or not at least one predetermined upper threshold value of the operating temperature or of an increase of the operating-temperature or of an increase rate of the measured operating temperature has been reached or exceeded; - if the upper threshold value is determined to be reached or exceeded, the user equipment transmitting a temperature information element to a network node of the cellular radio access network, the temperature information element being indicative of the fact that the respective upper threshold value has been reached or exceeded; - the user equipment receiving, in response to its transmission of the temperature information element, from a radio-network-controller node a control signal indicative of an instruction to the user equipment to reconfigure its connection to the at least one cellular radio access network to use a second set of operating parameters requiring a smaller average power input by the user equipment in using radio resources for the connection to the at least one cellular radio access network in comparison with the first set of operating parameters;, wherein the received control signal is additionally indicative of an instruction to operate under an assignment to at least one second radio link, which is different from the first radio link, and wherein the user equipment, in response to receiving the control signal, performs a radio-link reconfiguration procedure to change from the at least one first radio link to the at least one second radio link in a different RAT so as to use the second set of operating parameters instead of the first set of operating parameters. - the user equipment being connected to at least one cellular radio access network via at least one first radio link, using a first set of operating parameters that are associated with the at least one first radio link; - the user equipment performing a measurement of a quantity that is indicative of a current operating temperature of the user equipment or performing a predetermined sequence of at least two such measurements; - the user equipment determining whether or not at least one predetermined upper threshold value of the operating temperature or of an increase of the operating-temperature or of an increase rate of the measured operating temperature has been reached or exceeded; - if the upper threshold value is determined to be reached or exceeded, the user equipment transmitting a temperature information element to a network node of the cellular radio access network, the temperature information element being indicative of the fact that the respective upper threshold value has been reached or exceeded; - the user equipment receiving, in response to its transmission of the temperature information element, from a radio-network-controller node a control signal indicative of an instruction to the user equipment to reconfigure its connection to the at least one cellular radio access network to use a second set of operating parameters requiring a smaller average power input by the user equipment in using radio resources for the connection to the at least one cellular radio access network in comparison with the first set of operating parameters;,