User equipment having operating modes of at least a connected mode (CONN) and an idle mode (IDLE) includes a measurement unit configured to measure radio quality in the idle mode in accordance with measurement target information indicating that the user equipment is preset to report a measurement value of the radio quality to a base station, a storage unit configured to store the measurement target information and the measurement value of the radio quality measured by the measurement unit and a transmitting unit configured to, if a predefined report condition (log exist condition, FIG. 3) is satisfied, transmit an indicator indicative of presence of the measurement value of the radio quality to the base station in the connected mode and in response to a request from the base station, transmit a report signal including the measurement value of the radio quality.