Method of transmitting data based on adaptive modulation and coding

A method of transmitting an adaptive modulation and coding (AMC) level in an AMC scheme-based communication system, the method comprising:

• grouping a plurality of mobile stations having a same channel state;
• transmitting a first frame to the plurality of mobile stations in a first transmission period, the first frame comprising a first data burst, a first submap and a first map wherein the first submap indicates a resource allocation state of the first data burst, and the first map indicates an AMC level for the first submap;
• and
• transmitting a second frame to the plurality of mobile stations in a second transmission period, the second frame comprising a second data burst, a second submap and a second map wherein the second submap indicates a resource allocation state of the second data burst, and the second map indicates an AMC level for the second submap,
• wherein the AMC level for the first submap and the AMC level for the second submap are determined by channel states of the plurality of mobile stations, and
• wherein the first submap and the second submap are regions including control information for the plurality of mobile stations having the same channel state, and
• wherein the first map and the second map are transmitted through fixed radio resources in corresponding frames, the radio resources comprising an orthogonal frequency division multiplexing (OFDM) symbol contiguous to a first OFDM symbol where a preamble is transmitted,
• wherein the first map indicates the AMC level for the first submap with a full AMC level that represents any selected one of all AMC levels
• and the second map indicates the AMC level for the second submap with a differential AMC level that represents an amount of change in the AMC level for the second submap comparing with the AMC level for the first submap,
• and the differential AMC level comprises a value of the amount of change in the AMC level for the second submap and AMC level up/down information that indicates whether the value is a positive or negative number.