The base station device

From the connection instruction from the macro base station apparatus to the small cell is transmitted to the mobile station, pico base station apparatus overhead until the scheduling of the mobile station apparatus has a problem of increasing. A first base station apparatus constituting the first cell to transmit the control information to the mobile station apparatus, the second base station apparatus is present a second cell configured in the first cell, in the control information of the first base station apparatus is an indication of transmission of the reference signal to the mobile station apparatus in the first cell, to one of said first base station and the second base station apparatus It includes information for designating to transmit the reference signal, the information of the transmission parameters to be used in transmission of the reference signal to the base station apparatus instructed in the control information, and notifies the control information to the mobile station apparatus.