Patent ID: 8811274

Claim:
A method for transmitting, by a mobile station employing one or more reception schemes, channel quality information (CQI) for at least two codewords to a base station in a mobile communication system, the method comprising: transmitting, to the base station, a first CQI value for a first codeword of the at least two codewords and a spatial differential CQI value, wherein the spatial differential CQI value is one of a first predetermined number of spatial differential CQI values and indicates a first difference between the first CQI value for the first codeword and a second CQI value for a second codeword of the at least two codewords, wherein the first predetermined number of spatial differential CQI values are index values that fall within a predetermined range of index values that is asymmetric with respect to zero, wherein the predetermined range of index values is a function of the one or more reception schemes, wherein the first difference is given by: the first difference=the first CQI value for the first codeword−the second CQI value for the second codeword, and wherein the first predetermined number of spatial differential CQI values includes a greater number of negative spatial differential CQI values than positive spatial differential CQI values.