Patent ID: 8798031

Claim:
A user equipment comprising: a receiving section configured to receive a downlink signal transmitted from a radio base station; a radio link quality measuring section configured to measure radio link quality of the downlink signal received in the receiving section; a state managing section configured to manage whether or not communications with the radio base station are in a discontinuous reception state from a monitoring result of a downlink control channel; a synchronization determining section configured to determine a downlink synchronization state based on the radio link quality measured in the radio link quality measuring section, when whether or not the communications are in a discontinuous reception state is notified from the state managing section, and the communications are in a connected state in which a radio link is established with the radio base station and are in the discontinuous reception state; and wherein the synchronization determining section switches a synchronization determining scheme for determining the downlink synchronization state in the case that the communications are in the connected state in which the radio link is established with the radio base station and are in the discontinuous reception state, and in the case that the communications are in the connected state in which the radio link is established with the radio base station and are not in the discontinuous reception state.