Patent ID: 7970403

Claim:
A mobile station comprising: a cell selector unit configured to select a cell satisfying a predetermined communication quality, as a connection re-establishment target cell, from among a plurality of cells including a connection source cell managed by a connection radio base station to which the mobile station is communicating, after a failure of a detection of a radio link with the connection radio base station; and a transmitter unit configured to transmit a connection re-establishment request signal to a connection re-establishment target candidate radio base station managing the connection re-establishment target cell, when the connection re-establishment target cell selected by the cell selector unit is a cell using the same radio access scheme as that of the connection source cell, wherein the transmitter unit is configured to notify, to a mobile exchange station managing the connection re-establishment target candidate radio base station, information on the mobile station via the connection re-establishment target candidate radio base station, and to cause the mobile exchange station to start a connection recovery procedure for starting communication between the mobile station and the connection re-establishment target candidate radio base station, when a notification of rejection of connection re-establishment is made by the connection re-establishment target candidate radio base station as a response signal in response to the connection re-establishment request signal transmitted from the transmitter unit, or when the connection re-establishment target cell is a cell using a radio access scheme different from that of the connection source cell.