Base station, user device, transmission method, and reception method

摘要

A base station includes a scheduler determining allocation of radio resources for each subframe; a control channel generating unit generating a control channel including common control information mapped across a system frequency band and specific control information mapped to one or more resource blocks allocated to a selected user device; and a transmission signal generating unit generating a transmission signal by time-division-multiplexing the common control information and the specific control information. The common control information is transmitted every subframe and includes information units with a predetermined data size, a format indicator representing one of preset options indicating the number of symbols occupied by the common control information, and information indicating the maximum number of the information units. The information indicating the maximum number of the information units is transmitted as a part of the common control information at a predetermined interval longer than or equal to one subframe.