The occurrence of problematic data portions during handover is prevented by a wireless base station in a wireless communication system wherein mobile stations to be transmitted to are selected successively from a plurality of transmission destination candidate mobile stations and data transport to the selected mobile station is performed via a shared channel, the wireless base station comprising a detection unit which detects mobile stations undergoing handover; and a control unit which provides control such that a mobile station detected by the detection unit becomes less likely to be selected as described above as compared to other mobile stations.