5G NR 频率和频点换算

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 5G NR 频率和频点换算 ?

5G NR 频率和频点换算 -----RF Reference Frequency

The global frequency channel raster defines a set of RF reference frequencies 5G NR 频率和频点换算 .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---∆????????????????????????????----产生一系列--- FREF

5G NR 频率和频点换算

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：

5G NR 频率和频点换算

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.

5G NR 频率和频点换算

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