A base station 100 estimates the amount of buffered data in a mobile station buffer, which is included in a mobile station 200A and configured to temporarily store downlink data and uplink data, on the basis of a sum of: downlink data which has been transmitted to the mobile station 200A already but whose acknowledgement has not been received yet; and uplink data which is presumed to be transmitted from the mobile station 200A to the base station 100 after transmission of acknowledgement of uplink data from the base station 100 to the mobile station 200A. The base station 100 stops scheduling of at least one of downlink data to be transmitted to the mobile station 200A and uplink data to be transmitted from the mobile station if the estimated amount of buffered data exceeds a predetermined threshold.