g Backoff Start Initial back-off window size for initial ranging contention expressed as a power of 2 (0 n < 15). Initial Ranging Backoff End Final back-off window size for initial ranging contention expressed as a power of 2 (0 < n < 15). UL BW-REQ Channel Ob000: First UL subframe in every Information superframe; 0b001: First UL subframe in every frame; 0b010: Every UL subframes in every frame. Bandwidth Request S-SFH SP3 Initial back-off window size for Backoff Start contention bandwidth request expressed as a power of 2 (0 <n< 15). Bandwidth Request Backoff End Final back-off window size for contention bandwidth request expressed as a power of 2 (0 <n < 15). fpPowerConfig Power level of each frequency partition in fractional frequency reuse scheme (power boosting/de- boosting values). CHAPTER 9 The IEEE 802. 16m Physical Layer (Part I) The last five OFDM symbols of the first subframe of a superframe are used to transmit the superframe header. All PRUs in the first subframe of a superframe have five OFDM symbols with a two-stream pilot pattern, as defined earlier. Note that the first OFDM symbol of this subframe is allocated to the secondary advanced preamble. The subframe, where the SFH is located, always contains one frequency partition, FP0. All NPRU PRUs in the subframe where the SFH is located are permuted to generate the distributed LRUs. The permutation and frequency partition of the SFH subframe is described by the parameters DSAC = 0 (all mini-bands with no sub-band), DFPC = 0 (frequency reuse-1), DCASSBO = 0 (no sub-band CRU allocated), and DCASMBO = 0 (no mini-band CRU allocated). The following parameters are further defined: NSFH is the number of distributed LRUs which are occupied by the SFH where NSFH = NP-SFH + NS-SFH; NP-SFH (fixed) is the number of distributed LRUs which are occupied by the P-SFH (NP-SFH 4); NS-SFH (variable) is the number of distributed LRUs which are occupied by the S-SFH. The SFH occupies the first NSFH distributed LRUs in the first subframe of the superframe where NSFH 24. 