e 6 X 6 UL tiles. In the LZone with a UL-PUSC subchannelization scheme, the bandwidth request channels consist of three 4 X 6 UL tiles. Note that the UL tile granularity is different for the new and the legacy zones. The bandwidth request channels use LRUs constructed after the tile permutation. Let UL_FEEDBACK_SIZE denote the number of distributed LRUs in frequency partition FPi that are reserved for feedback channels, the number of feedback channels in frequency partition FPi is then LFB-FPi = NFB X UL_FEEDBACK_SIZE, where NFB is 3 in MZone and 4 in the LZone with UL-PUSC. The primary and secondary fast-feedback channels are formed by three permuted 2 X Feedback Mini-Tiles (FMT) where a feedback mini-tile is a subdivision of the IEEE 802.16m UL tile (i.e., 2 sub- carriers by 6 OFDM symbols). The feedback mini-tile reordering procedure is as follows: 1. The uplink tiles in the distributed LRUs reserved for feedback channels are divided into 2 X 6 feedback mini-tiles. The FMTs are numbered from 0 to 3 X LFB-FPi 1; 2. A mini-tile reordering is applied to the available 2 X 6 FMTs to obtain the reordered FMTs; 3. Each group of three consecutive reordered FMTs form a feedback channel. The HARQ feedback channel is used to transmit six HARQ feedback channels. The number of HARQ feedback channels is denoted by the LHFB-FPi parameter. A pair of HARQ feedback channels is formed by three 2 reordered HARQ Mini-Tiles (HMT), where a HARQ mini-tile is a subdivision of the IEEE 802.16n UL tile (i.e., 2 sub-carriers by 2 OFDM symbols). The HMTs reordering procedure and the construction of the HARQ feedback channel are described below and illustrated in Figure 9-29. Table 9-4 Summary of Uplink Subchannelization and Permutation Parameters [2] Parameters Signaling Field Calculated Bandwidth Signaling from Signaled Procedure (20/10/5 MHz) Mechanism Fields Definition Sector Sub-band and USAC (5/4/3) S-SFH Number of sub-bands Sub-band Common Mini-band Sub-packet 2 LSB = N1 * KSB Number of PRUs Partitioning Assigned to sub-bands Number