A radio base station includes: a table storage unit storing a table in which an E-TFCI indicating a transport format combination indicator of the physical data channel to be transmitted by a mobile station is associated with .beta.ed that is used to determine a SG and is an offset value of transmission power of the physical data channel to be transmitted by the mobile station; a parameter selector selecting the .beta.ed associated with the E-TFCI from the table; and a communication controller determining a SG based on the .beta.ed thus selected and an E-TFCI associated with the selected .beta.ed, and controlling transmission power of the mobile station by using the SG thus determined.