condary uplink fast-feedback channel timing feedback mini-tile is formed by two contiguous sub-carriers over six OFDM symbols. The uplink feedback control channels are formed by applying a UL mini-tile permutation to the LRUs allocated the control resource. The primary and secondary fast-feedback channels each consists of three reor- dered FMTs. The process of forming a PFBCH is illustrated in Figure 10-12. The PFBCH information bits are used to generate a PFBCH sequence according to certain mapping [2]. The resulting sequence of bits is modulated, repeated, and mapped to uplink PFBCH symbol s[k], where 0 is mapped to +1 and 1 is mapped to 1. The mapping of the primary fast-feedback channel symbol s[k] to the UL FMTs is given by Cij = s[Kij], 0,1,2 and 0 < j < 11, where Cij and Kij are the FMT elements and jth element of the ith mapping sequence. This set of sequences can carry up to six information bits. The SFBCH comprised three distributed FMTs with two pilots allocated in each FMT. The pilot sequence (po, p1, P2, P3, p4, p5) is modulated as [1, 1, 1, 1, 1, 1] with pilot boosting. The SFBCH symbol generation procedure can be described as follows. The SFBCH information bits aoa1 aL-1 encoded with M bits bob1...bm-1 using the TBCC encoder with minimum code rate of 1/5. The value parameter M is set to 60. The value of parameter 7 L 24 depends buffer The coded sequence bob1...bM- is then modulated with M/2 symbols using QPSK modulation. The modulated symbols COC1 .cm/2-1 are mapped to the data sub-carriers of the SFBCH FMTs, as shown in Figure 10-12. When the length of feedback information bits is less than 7, a number of ones are padded to the end of feedback message to adjust the length. 10.3.2 HARQ Feedback Channel The HARQ feedback channels are used to carry ACK/NACK information corresponding to downlink transmissions. The HARQ feedback channels start at predetermined time offsets relative to the corresponding DL transmissions and are frequency-division multiplexed with other control and data channels over an 