Patent ID: 8797882

Claim:
A mobile station communicating with a radio base station, comprising: a parameter acquisition unit configured to acquire a discontinuous reception state parameter and a non-discontinuous reception state parameter from the radio base station; a synchronization state determination unit configured to determine a downlink synchronization state, based on a radio quality of a serving cell for the mobile station; a radio link failure state determination unit configured to determine whether or not the mobile station is in a radio link failure state, based on a determination result by the synchronization state determination unit; and a connection re-establishment unit configured to re-establish a connection with the radio base station, when the radio link failure state determination unit determines that the mobile station is in the radio link failure state, wherein the radio link failure state determination unit determines whether or not the mobile station is in the radio link failure state, based on the downlink synchronization state determined by the synchronization state determination unit and the discontinuous reception state parameter acquired by the parameter acquisition unit, when the mobile station is in a discontinuous reception state; and the radio link failure state determination unit determines whether or not the mobile station is in the radio link failure state, based on the downlink synchronization state determined by the synchronization state determination unit and the non-discontinuous reception state parameter acquired by the parameter acquisition unit, when the mobile station is not in the discontinuous reception state, wherein the discontinuous reception state includes reception states for receiving signals and non-reception states for not receiving signals that are set alternately and repeatedly.