Basic Conception:
| RF |
Radio Frequency |
| FR |
Frequency Range FR1:450MHz-6GHz FR2:24.25GHz-52.6GHz |
|
|
RF Reference Frequency |
|
|
NR Absolute Radio Frequency Channel Number (NR-ARFCN) |
| UE channel bandwidth |
supports a single NR RF carrier in the uplink or downlink at the UE. |
| BS channel bandwidth |
supports a single NR RF carrier in the uplink or downlink at the UE. |
| ΔFGlobal |
The granularity of the global frequency raster. |
1.What is 
?
-----RF Reference Frequency
The global frequency channel raster defines a set of RF reference frequencies .The RF reference frequency is used in signalling to identify the position of RF channels, SS blocks and other elements. 38101-1-f30 5.4.2
频率是一系列连续的值，如3.4567GHz，3.6666GHz，那么有哪些频率值可以用来标记载波的中心频点或者SSB的频点呢，与LTE一样，NR的协议中定义了表格5.4.2.1-1：NR-ARFCN parameters for the global frequency raster
| Frequency range (MHz) |
ΔFGlobal (kHz) |
FREF-Offs (MHz) |
NREF-Offs |
Range of NREF |
| 0 – 3000 |
5 |
0 |
0 |
0 – 599999 |
| 3000 – 24250 |
15 |
3000 |
600000 |
600000 – 2016666 |
ΔFGlobal：global frequency channel raster ---通过---∆𝐹𝐺𝑙𝑜𝑏𝑎𝑙----产生一系列--- FREF
2.What is NREF?NREF is the NR-ARFCN.--from 38101-1-f30
RF reference frequencies are designated by an NR-ARFCN in the range (0.. 2016666) on the global frequency raster. The relation between the NR-ARFCN and the RF reference frequency FREF in MHz is given by the following equation
我理解，NREF就是把一频率映射到一系列整数序号。由上边的公式变形，就可以由frequency得到：
3.What is channel raster
Channel raster 是从Global frequency channel raster 已一定的规则挑选出的部分frequency(这样可以减小UE的计算范围)。其粒度granularity 叫做ΔFRaster。形成如下表格，<20>表明是ΔFGlobal 的20倍。
| NR Operating Band |
ΔFRaster (kHz) |
Uplink Range of NREF (First – <Step size> – Last) |
Downlink Range of NREF (First – <Step size> – Last) |
| n1 |
100 |
384000 – <20> – 396000 |
422000 – <20> – 434000 |
| n2 |
100 |
370000 – <20> – 382000 |
386000 – <20> – 398000 |
| n3 |
100 |
342000 – <20> – 357000 |
361000 – <20> – 376000 |
For NR operating bands with 100 kHz channel raster, ΔFRaster = 20 × ΔFGlobal.
转载：https://blog.csdn.net/ibos168/article/details/105611670