cheme (MCS) of the feedback channel, Various Event-Driven Indicators (EDI), and Sub-band Index for the best sub-band depending on the encoding type. Encoding Type 2 in PFBCH is used for PMI reporting where the ith codebook entry C(N1, Mt, NB, i) is mapped to sequence index i in PFBCH. The SFBCH carries narrowband CQI and MIMO feedback information and the number of infor- mation bits that can be adaptively changed is between 7 and 24. Feedback formats define the infor- mation content carried by the fast-feedback channels. The format of the content of the PFBCH is determined by the PFBCH encoding type. The SFBCH payload information bits may carry sub-band indices (i.e., best sub-band index), STC rate, wideband STC rate, PFBCH indicator, sub-band CQI, sub- band average CQI, differential CQI, stream index, wideband PMI, sub-band PMI, base PMI (i.e., base PMI is a PMI generated from the base codebook or the base codebook subset), and differential PMI. The timing and content of the fast-feedback channels are mainly controlled by the MIMO feedback mode, as well as the short-term and long-term feedback period parameters carried via Feedback Allocation A-MAP IE. The secondary fast-feedback channel parameters are shown in Table 10-17. The MS reports the CQI values by selecting a modulation and coding index from Table 10-18. The MCS index is selected assuming allocation size of 4 LRUs in a six OFDM symbol subframe, and 10% target error rate for the first HARQ transmission. It must be noted that the channel conditions may vary from the time that the CQI measurement is conducted on the reference signal until the CQI is reported 10.3 Uplink control channels Modulation Symbol to Information Bits Sequence Sub-carrier Primary Fast Generation Feedback Channel Repetition Mapping Symbol to Information Bits Sequence Sub-carrier Secondary Fast Generation Modulation Feedback Channel Mapping Secondary Fast Feedback Primary Fast Feedback Channels Channels Feedback Feedback Mini-Tile Mini-Tile UL Subframe UL Subframe Pilot FIGURE 10-12 Ph