A method for determining a data rate for transmitting traffic data from a mobile station to a base station in a mobile communication system includes steps of receiving data rate control information from at least one base station; obtaining, based on the received data rate control information, a maximum transmittable data rate; obtaining a plurality of data rates for transmitting traffic data to the at least one base station, the plurality of data rates being obtained by considering a status factor of the mobile station; and determining the data rate of the traffic data to the at least one base station by selecting one of the obtained maximum transmittable data rate and plurality of data rates. The method determines the reverse data rate based on data rate control information and according to its own status, to provide system stability and minimize interference with other mobile stations while increasing the throughput for the sector and maintaining a desired QoS level even when the mobile station transmits at less power while.