Patent ID: 7725109

Claim:
A method for requesting a Base Station (BS) to assign sub-channels to a Subscriber Station (SS) in a communication system, the method comprising: determining a channel quality of sub-channels assigned using a normal sub-channel assignment scheme; transmitting, to the BS, a first codeword C 1 of a Channel Quality Indicator CHannel (CQICH) indicating a transition from the normal sub-channel assignment scheme to a band Adaptive Modulation and Coding (AMC) sub-channel assignment scheme, when the SS determines to transition from the normal sub-channel assignment scheme to the band AMC sub-channel assignment scheme based on the determined channel quality; transmitting a second codeword C 2 of the CQICH and a report response message in response to a report request message received from the BS, wherein the report response message includes Carrier-to-Interference Noise Ratio (CINR) measurements of bands selected for the band AMC sub-channel assignment scheme; and transmitting, to the BS, differential Channel Quality Indicators (CQI) of the selected bands.