Base station device

A base station apparatus in a mobile communication system of a Code Division Multiple Access (CDMA) method, having m (m≦M) carrier receiving means to which more than one received carrier received in diversity reception by M sectors is distributed, said m carriers each comprising,

• receiving means disposed in a number necessary to process a plurality of received signals received in diversity reception by the M sectors and performing conversion processing per sector by which a plurality of received signals received from a mobile station apparatus in diversity reception are individually converted into digital received signals,
• baseband processing means disposed in a number necessary to accommodate all the radio channels in all the received carriers that correspond to the carrier receiving means, and
• single first bus means that transmits the output of said receiving means to said baseband processing means,
• and said baseband processing means further comprising, in addition to a synchronization function and RAKE reception demodulation function that generate uplink baseband signals from digital received signals and a transmission power control function that outputs transmission power information by means of transmission power control processing per uplink radio channel, a channel decoding function that generates main signals from uplink baseband signals and a channel coding function that generates downlink baseband signals from downlink main signals.