d and form a channel raster for that band with granularity \Fraster \F global. The channel raster is mapped to physical resource block NPRB = NRB/2 with resource element index k = 0 or 6 depending on whether NRBMOD2 =0 or 1, respectively [9]. The RF reference frequency in the uplink and downlink is identified by the NR absolute radio frequency channel number (NR-ARFCN) in the range [0. 13279167] on the global frequency raster. The relationship between the NR-ARFCN and the RF reference frequency FREF in MHz for the downlink and uplink is given as FREF = FREF-offset + \Fraster (NREF - NREF-offset), where FREF-offset and NREF-offset are given in Table 3.10 and NREF represents the NR-ARFCN [9]. For the supplementary bands and bands (n1, n2, n3, n5, n7, n8, n20, n28, n66, n71) (see Table 3.8), the reference frequency is defined as FREF-shift = FREF shift where shift==0 or 7.5kHz is signaled by the network. A channel raster of 100 kHz is used for some NR operating bands, in which \Fraster = 20\Fglobal; thus every 20th NR-ARFCN within the operating band can be used for the channel raster with the step size of 20. For NR operating bands below 3 GHz with 15 kHz channel raster \Fraster NstepAF global In this case, every nstep E {3,6} NR-ARFCN within the operating band is a candidate channel raster. There are NR operating bands above 3 GHz where the channel raster is either 15 or 60 kHz. In that case, \Fraster = NstepAF global and every nstep E {1,2} NR-ARFCN within the operating band is a candidate channel raster. New Radio Access Physical Layer Aspects (Part 1) 383 Table 3.10: NR absolute radio frequency channel number parameters for the global frequency raster [9]. Frequency Range (MHz) Fglobal (kHz) FREF-offset (MHz) FREF-offset NREF Range 0-3000 0-599,999 3000-24,250 600,000 600,000-2,016,666 24,250-100,000 24,250 2,016,667 2,016,667-3,279,167 Table 3.11: Global synchronization channel number (GSCN) parameters for the global frequency raster [9]. Frequency (MHz) Synchronization Block Frequency Position SSREF Range of G