Cellular system, a base station and a mobile station, and a communication control method

Before packet packet signal transmitted, while the packet the packet transmission base station (BS1) to improve the UL DPCH target SIR (S12), to improve the TPC transmission power (S13) to DL the DPCH transmitted, to improve power balancing reference power, improved DL DPCH transmission power (S14). In the mobile station (MS3), the packet reception in the packet, only packets transmitted packet the base station 1 to control the TPC UL DPCH transmission power (S15). Thus, to improve the reception quality of ACK / NACK on HS-DPCCH in the base station 1, thereby reducing the error rate of ACK / NACK signals.