Method and system for transmitting/receiving data in a communication system

The present invention relates to a data transmission method and system for improving the efficiency of use of resources in a communication system for transmitting and receiving data using a limited resource. In the present invention, the data transmission method of a mobile station in a communication system for this purpose, the steps of: measuring a channel state of the allocation from the base station, the coding corresponding to the measured channel state information to the allocation scheme of the assigned channel, Configuring the CSI message containing the encoded channel state information, and comprising the step of transmitting to the said composed channel state information message, the base station, the method comprising the coding is, adjustment of the assigned channel ever modulation and coding It comprises the step of determining: (AMC adaptive modulation and coding) level, encoding the measured channel state information corresponding to the determined AMC level. Transmitting and receiving data, CSI, CSICH, AMC, Indicator / Position, Differential / Grouped