F 1 and the MSB of RIF 0, other 6 bits in RIF indicate two sub-bands {SB[u], SB[v]}, 0< u<v< 10 and 8 SLRUs are allocated in sub-bands SB[u] and SB[v]. The other 1, 2, or 3 SLRUs in SB[w] are identified by PIF bits where and V are indexed as RIF = If TIF 1 and MSB of RIF 1, other 6 bits in RIF indicate two sub-bands {SB[u], SB[v]}, O<u< V <10 and the 4 SLRUs are allocated in sub-band SB[u]. The other 1, 2, or 3 SLRUs in SB[v] are identified by PIF bits where and V are indexed as RIF = (4)+(2). 10.2 Downlink control channels Sub-band NSB-1 Sub-band NSB-2 Sub-band 0 4NSB-1 4NSB-3 4NSB-4 4NSB-5 4NSB-6 4NSB-7 4NSB-8 RA Bit RA Bit RA Bit RA Bit RA Bit RA Bit RA Bit 0 3NSB-1 3NSB-2 3Nsg-3 3Nsg-4 3NSB-5 3NSB-6 Bit 2 Bit 1 (LSB) NSB <4 NSB-3 Sub-band 4 SLRUs 4 SLRUs 4 SLRUs 4 SLRUs 4 SLRUs 4 SLRUs Bit 11 Bit 0 Bit 10 Bit 9 Bit 4 Bit 3 Bit 2 Bit 1 (MSB) Nsg-1 NSB-2 NSB-3 (LSB) <NSB <11 (Sub-band Allocation) Bit 11 Bit 0 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 (MSB) (LSB) 5< NSB<11 (Non-sub-band Allocation) NSB 2 Sub-band 4 SLRUs 4 SLRUs 4 SLRUs 4 SLRUs 4 SLRUs 4 SLRUs 4 SLRUs Bit 0 Bit 11 Bit 10 Bit 9 Bit 1 NSB-1 NSB-2 (LSB) Bit 11 Bit 0 Bit 0 Bit 10 Bit 9 Bit 11 Bit 10 Bit 1 (MSB) NsB-1 (LSB) (LSB) 12<NSB<21 FIGURE 10-9 Interpretation of the RA field in downlink sub-band assignment A-MAP IE [2] CHAPTER 10 The IEEE 802. 16m Physical Layer (Part II) For 12 < NSB < 21, SLRUs are allocated in a single instance using one Sub-band Assignment A-MAP IE or two concatenated Sub-band Assignment A-MAP IEs. The MSB of the RA field is denoted as the IEF. If IEF = 1, a single instance of resource allocation is made using two IEs. The IEF in both IEs are 1. The RA fields of the two IEs with IEF = 1 is concatenated to form a 22-bit field referred to as the Concatenated Resource Indication Field (CRIF). The LSB of the RA field of the Sub-band Assignment A-MAP IE occurring last in the AMAP region is interpreted as the LSB of the CRIF. Each of the j-bit position in the CRIF (0 < j < NSB) indicates the allocation or non-