A method of operating a user equipment in a mobile communication system, the method comprising: ascertaining whether the user equipment is in a static radio environment; comparing one or more parameters that characterize a changeable state of the user equipment with historical data of the user equipment to determine whether the changeable state of the user equipment presently matches a previously observed changeable state, wherein the one or more parameters that characterize the changeable state of the user equipment include a geographic position of the user equipment or a time of day at a geographic position of the user equipment; said method being characterized by: if it is determined (559, 563) that the user equipment is in the static radio environment and that the changeable state of the user equipment presently matches the previously observed changeable state, then repeatedly measuring a surrounding non-serving cell radio environment of the user equipment at a first rate; if it is determined that the user equipment is in the static radio environment and that the changeable state of the user equipment does not presently match the previously observed changeable state (507, 547), then repeatedly measuring the surrounding non-serving cell radio environment of the user equipment at a second rate for a predetermined period of time; and if it is determined that the user equipment is not in the static radio environment (417, 513), then repeatedly measuring the surrounding non-serving cell radio environment of the user equipment at the second rate for an unrestricted amount of time, wherein the first rate is lower than the second rate. ascertaining whether the user equipment is in a static radio environment; comparing one or more parameters that characterize a changeable state of the user equipment with historical data of the user equipment to determine whether the changeable state of the user equipment presently matches a previously observed changeable state, wherein the one or more parameters that characterize the changeable state of the user equipment include a geographic position of the user equipment or a time of day at a geographic position of the user equipment; said method being characterized by: if it is determined (559, 563) that the user equipment is in the static radio environment and that the changeable state of the user equipment presently matches the previously observed changeable state, then repeatedly measuring a surrounding non-serving cell radio environment of the user equipment at a first rate; if it is determined that the user equipment is in the static radio environment and that the changeable state of the user equipment does not presently match the previously observed changeable state (507, 547), then repeatedly measuring the surrounding non-serving cell radio environment of the user equipment at a second rate for a predetermined period of time; and if it is determined that the user equipment is not in the static radio environment (417, 513), then repeatedly measuring the surrounding non-serving cell radio environment of the user equipment at the second rate for an unrestricted amount of time, if it is determined (559, 563) that the user equipment is in the static radio environment and that the changeable state of the user equipment presently matches the previously observed changeable state, then repeatedly measuring a surrounding non-serving cell radio environment of the user equipment at a first rate; if it is determined that the user equipment is in the static radio environment and that the changeable state of the user equipment does not presently match the previously observed changeable state (507, 547), then repeatedly measuring the surrounding non-serving cell radio environment of the user equipment at a second rate for a predetermined period of time; and if it is determined that the user equipment is not in the static radio environment (417, 513), then repeatedly measuring the surrounding non-serving cell radio environment of the user equipment at the second rate for an unrestricted amount of time, wherein the first rate is lower than the second rate.