GROUND RADIO STATION

A ground radio station of a radio communication system which includes a plurality of ground radio stations placed along a movement path of a mobile radio station and in which the mobile radio station switches the ground radio stations to connect to as the mobile radio station moves, the ground radio station including; a radio controller to reserve a radio resource for the mobile radio station in a case where, before the mobile radio station communicates with the ground radio station, the mobile radio station communicates with another ground radio station adjacent to the ground radio station; and a communication-status monitor to monitor a radio signal sent from the mobile radio station to the another ground radio station, wherein, when the communication-status monitor detects that the radio signal is not received for a predetermined time, the communication-status monitor checks communication status between the mobile radio station and the another ground radio station, and wherein, when the communication-status monitor confirms that there is no communication between the mobile radio station and the another ground radio station, the radio controller releases the radio resource.