Subchannels Localized Group Distributed Inner Group Permutation Localized Group Distributed Inner Group Permutation Localized Group -Inter-cell (Semi Static) Intra-cell (Dynamic) FIGURE 9-22 An illustration of the downlink/uplink physical to logical resource mapping concept [2] The PRUs are divided and reordered into two groups: (1) sub-band PRUs; and (2) mini-band PRUs, denoted by PRU SB and PRU MB, respectively. The set of PRU SB is numbered from 0 to (LSB - 1), and the set of PRU MB is numbered from 0 to (LMB - 1), where LSB and LMB denote the number of PRUs in sub-bands and mini-bands, respectively (see Figure 9-23). The sub-band and mini-band permutation formulae are defined in reference [2]. The set of PRU SB and Permuted PRUMB (PPRUMB) are allocated to one or more frequency partitions. By default, only one partition is present. The maximum number of frequency partitions within the transmission bandwidth is four. The mini-band permutation maps the PRUMB to the PPRU MB to ensure frequency diversity among the PRUs that are assigned to each frequency partition. The frequency partition configuration is transmitted in the secondary superframe header using the parameter Downlink Frequency Partition Configuration (DFPC) whose value depends on the system bandwidth. The Frequency Partition Count (FPCT) parameter defines the number of frequency partitions. The Frequency Partition Size (FPSi) parameter defines the number of PRUs allocated to the ith frequency partition FPi. The FPCT and FPSi parameters are determined from the DFPC. The Downlink Frequency Partition Sub-band Count (DFPSC) parameter defines the number of sub-bands allocated to FPi. The PPRU FPi resources are mapped to LRUs. Additional PRU and sub- carrier permutations are constrained to the PRUs within a frequency partition. The distinction between CRUs and DRUs is done on a sector-specific basis. Let LSB-CRU-FPi and LMB-CRU-FPi denote the number of allocated sub-band CRUs and mini-band CRUs to the ith frequency partition FPj, the total number of allocat