NR-ARFCN和频率之间换算

一直以来频点、频率之间的换算都是个麻烦和疑惑人的问题，很多时候都是死记硬背的记下来，但是到了NR基本都不是整数的频率，所以就更加麻烦，再次我做一个协议的简单解读和excel公式的简单介绍。

根据R16版本的38.104协议，咱们可以得到如下内容。

把0-100000MHz分成三段如下

Table 5.4.2.1-1: NR-ARFCN parameters for the global frequency raster

Frequency range (MHz)	ΔF_Global (kHz)	F_REF-Offs (MHz)	N_REF-Offs	Range of N_REF
0 – 3000	5	0	0	0 – 599999
3000 – 24250	15	3000	600000	600000 – 2016666
24250 – 100000	60	24250.08	2016667	2016667 – 3279165

其中FR1和FR2中每个频段的范围和频点间隔步进如下图所示

Table 5.4.2.3-1: Applicable NR-ARFCN per operating band in FR1

NR Operating band	ΔF_Raster (kHz)	Uplink Range of N_REF (First – <Step size> – Last)	Downlink Range of N_REF (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
n5	100	164800 – <20> – 169800	173800 – <20> – 178800
n7	100	500000 – <20> – 514000	524000 – <20> – 538000
n8	100	176000 – <20> – 183000	185000 – <20> – 192000
n12	100	139800 – <20> – 143200	145800 – <20> – 149200
n14	100	157600 – <20> –159600	151600 – <20> – 153600
n18	100	163000 – <20> – 166000	172000 – <20> – 175000
n20	100	166400 – <20> – 172400	158200 – <20> – 164200
n25	100	370000 – <20> – 383000	386000 – <20> – 399000
n28	100	140600 – <20> – 149600	151600 – <20> – 160600
n30	100	461000 – <20> – 463000	470000 – <20> – 472000
n34	100	402000 – <20> – 405000	402000 – <20> – 405000
n38	100	514000 – <20> – 524000	514000 – <20> – 524000
n39	100	376000 – <20> – 384000	376000 – <20> – 384000
n40	100	460000 – <20> – 480000	460000 – <20> – 480000
n41	15	499200 – <3> – 537999	499200 – <3> – 537999
n41	30	499200 – <6> – 537996	499200 – <6> – 537996
n48	15	636667 – <1> – 646666	636667 – <1> – 646666
n48	30	636668 – <2> – 646666	636668 – <2> – 646666
n50	100	286400 – <20> – 303400	286400 – <20> – 303400
n51	100	285400 – <20> – 286400	285400 – <20> – 286400
n65	100	384000 – <20> – 402000	422000 – <20> – 440000
n66	100	342000 – <20> – 356000	422000 – <20> – 440000
n70	100	339000 – <20> – 342000	399000 – <20> – 404000
n71	100	132600 – <20> – 139600	123400 – <20> – 130400
n74	100	285400 – <20> – 294000	295000 – <20> – 303600
n75	100	N/A	286400 – <20> – 303400
n76	100	N/A	285400 – <20> – 286400
n77	15	620000 – <1> – 680000	620000 – <1> – 680000
n77	30	620000 – <2> – 680000	620000 – <2> – 680000
n78	15	620000 – <1> – 653333	620000 – <1> – 653333
n78	30	620000 – <2> – 653332	620000 – <2> – 653332
n79	15	693334 – <1> – 733333	693334 – <1> – 733333
n79	30	693334 – <2> – 733332	693334 – <2> – 733332
n80	100	342000 – <20> – 357000	N/A
n81	100	176000 – <20> – 183000	N/A
n82	100	166400 – <20> – 172400	N/A
n83	100	140600 – <20> –149600	N/A
n84	100	384000 – <20> – 396000	N/A
n86	100	342000 – <20> – 356000	N/A
[n90]	15	499200 – <3> – 537999	499200 – <3> – 537999
	30	499200 – <6> – 537996	499200 – <6> – 537996
	100	499200 – <20> – 538000	499200 – <20> – 538000

Table 5.4.2.3-2: Applicable NR-ARFCN per operating band in FR2

NR Operating band	ΔF_Raster (kHz)	Uplink and Downlink Range of N_REF (First – <Step size> – Last)
n257	60	2054166 – <1> – 2104165
n257	120	2054167 – <2> – 2104165
n258	60	2016667 – <1> – 2070832
n258	120	2016667 – <2> – 2070831
n260	60	2229166 – <1> – 2279165
n260	120	2229167 – <2> – 2279165
n261	60	2070833 – <1> – 2084999
n261	120	2070833 – <2> – 2084999

根据频点和绝对频率的换算公式F_REF = F_REF-Offs + ΔF_Global (N_REF – N_REF-Offs)，其中F_REF是绝对频率，N_REF就是咱们说的NR-ARFCN，F_REF-Offs就是上表5.4.2.1-1中的第三列，ΔF_Global上表5.4.2.1-1中的第二列，N_REF-Offs上表5.4.2.1-1中的第四列。

举例计算：

此处咱们可以假设NR-ARFCN=520146，那么查表5.4.2.1-1可得F_REF-Offs =0，ΔF_Global =5，N_REF-Offs =0；代入公式计算可知0+5*(520146-0)=2600730kHz=2600.73MHz

NR-ARFCN和频率之间换算

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