MIMO mode ( This field is valid only if CQICH allocation type is set to 1 ) 3 bits 0 b 000 - 0 b 010 = Fast DL measurement / Default Feedback depending on CQICH types 0 b 011 = Quantized precoding weight feedback 0 b 100 = Index to precoding matrix in codebook 0 b 101 = Channel Matrix Information 0 b 110 - 0 b 111 = Reserved