5G NR GSCN (SSB FREQUENCY) Calculator

This Page provides information about 5G NR GSCN (Global Synchronization Channel Number) Calculator. Calculator is based on 3GPP TS 38.104 Release 15 specification.

It will help you to convert the number of the 5G NR GSCN (Global Synchronization Channel Number) to the 5G NR SS_ref (SSB) frequency and back (5G NR SS_ref frequency to 5G NR GSCN)

Example: 5G NR GSCN = 7725, 5G SS_ref Frequency = 3325.44 MHz

The formula for 5G NR GSCN is described in 3GPP TS 38.104 chapter 5.4.3

Table 5.4.3.1-1: GSCN parameters for the global frequency raster

Range of frequencies (MHz)	SS block frequency position SSREF	GSCN	Range of GSCN
0 – 3000	N * 1200 kHz + M * 50 kHz, N = 1:2499, M ϵ {1,3,5} (Note)	3N + (M-3)/2	2 – 7498
3000 – 24250	3000 MHz + N * 1.44 MHz, N = 0:14756	7499 + N	7499 – 22255
24250 – 100000	24250.08 MHz + N * 17.28 MHz, N = 0:4383	22256 + N	22256 – 26639
NOTE: The default value for operating bands which only support SCS spaced channel raster(s) is M=3.

Table 5.4.3.3-1: Applicable SS raster entries per operating band (FR1)

NR operating band	SS Block SCS	SS Block pattern (note)	Range of GSCN (First – <Step size> – Last)
n1	15 kHz	Case A	5279 – <1> – 5419
n2	15 kHz	Case A	4829 – <1> – 4969
n3	15 kHz	Case A	4517 – <1> – 4693
n5	15 kHz	Case A	2177 – <1> – 2230
n5	30 kHz	Case B	2183 – <1> – 2224
n7	15 kHz	Case A	6554 – <1> – 6718
n8	15 kHz	Case A	2318 – <1> – 2395
n12	15 kHz	Case A	1828 – <1> – 1858
n14	15 kHz	Case A	1901 – <1> – 1915
n18	15kHz	CaseA	2156 – <1> – 2182
n20	15 kHz	Case A	1982 – <1> – 2047
n25	15 kHz	Case A	4829 – <1> – 4981
n28	15 kHz	Case A	1901 – <1> – 2002
n29	15 kHz	Case A	1798 – <1> – 1813
n30	15 kHz	Case A	5879 – <1> – 5893
n34	15 kHz	Case A	5030 – <1> – 5056
n38	15 kHz	Case A	6431 – <1> – 6544
n39	15 kHz	Case A	4706 – <1> – 4795
n40	15 kHz	Case A	5756 – <1> – 5995
n41	15 kHz	Case A	6246 – <3> – 6717
n41	30 kHz	Case C	6252 – <3> – 6714
n48	30 kHz	Case C	7884 – <1> – 7982
n50	15 kHz	Case A	3584 – <1> – 3787
n51	15 kHz	Case A	3572 – <1> – 3574
n65	15 kHz	Case A	5279 – <1> – 5494
n66	15 kHz	Case A	5279 – <1> – 5494
n66	30 kHz	Case B	5285 – <1> – 5488
n70	15 kHz	Case A	4993 – <1> – 5044
n71	15 kHz	Case A	1547 – <1> – 1624
n74	15 kHz	Case A	3692 – <1> – 3790
n75	15 kHz	Case A	3584 – <1> – 3787
n76	15 kHz	Case A	3572 – <1> – 3574
n77	30 kHz	Case C	7711 – <1> – 8329
n78	30 kHz	Case C	7711 – <1> – 8051
n79	30 kHz	Case C	8480 – <16> – 8880
[n90]	15 kHz	Case A	6246 – <1> – 6717
[n90]	30 kHz	Case C	6252 – <1> – 6714
NOTE: SS Block pattern is defined in section 4.1 in TS 38.213 [10].

Table 5.4.3.3-2: Applicable SS raster entries per operating band (FR2)

NR operating band	SS Block SCS	SS Block pattern (note)	Range of GSCN (First – <Step size> – Last)
n257	120 kHz	Case D	22388 – <1> – 22558
n257	240 kHz	Case E	22390 – <2> – 22556
n258	120 kHz	Case D	22257 – <1> – 22443
n258	240 kHz	Case E	22258 – <2> – 22442
n260	120 kHz	Case D	22995 – <1> – 23166
n260	240 kHz	Case E	22996 – <2> – 23164
n261	120 kHz	Case D	22446 – <1> – 22492
n261	240 kHz	Case E	22446 – <2> – 22490
NOTE: SS Block pattern is defined in section 4.1 in TS 38.213 [10].

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