CQI transmission types include a type of transmitting a WB CQI only and a type of transmitting both a WB CQI and an SB CQI. In the type of transmitting a WB CQI only, CQI information for all bands is transmitted in subframes corresponding to every CQI transmission period. Meanwhile, in the case in which PMI information should also be transmitted according to the PMI feedback type as illustrated in FIG. 8, the PMI information is transmitted together with the CQI information. In the type of transmitting both a WB CQI and an SB CQI, the WB CQI and SB CQI are alternately transmitted.
FIG. 10 illustrates a system in which a system bandwidth consists of 16 RBs. It is assumed that the system bandwidth includes two Bandwidth Parts (BPs) BP0 and BP1 each consisting of two SubBands (SBs) SB0 and SB1 and each SB includes 4 RBs. The above assumption is exemplary and the number of BPs and the size of each SB may vary with the size of the system bandwidth. The number of SBs constituting each BP may differ according to the number of RBs, the number of BPs, and the size of each SB.
