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 17 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 for above 3 MHz channel bandwidth

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}	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 1:The default value for operating bands which only support SCS spaced channel raster(s) is M=3. NOTE 2: GSCN=2 (corresponding to ARFCN-ValueNR = 250) is a reserved value paired with reserved operating band n200.

Table 5.4.3.1-2: GSCN parameters for the global frequency raster for 3 MHz channel bandwidth

Range of frequencies (MHz)	SS block frequency position SS_REF	GSCN	Range of GSCN
0 – 1000	N * 600 kHz + M * 50 kHz + 300 kHz, N = 1:1665, M ϵ {1,3,5} (Note 1)	26638 + 3N + (M-3)/2	26640 – 31634
NOTE 1: Only applicable for 15 PRB transmission bandwidth configuration within 3 MHz channel bandwidth with punctured PBCH defined in TS 38.211 [9] clause 7.4.3.1.

Table 5.4.3.1-3: Additional GSCN parameters for the global frequency raster and for band n100

SS block frequency position SS_REF (MHz)	GSCN	Note
920.73	41637	Only applicable for 12 PRB transmission bandwidth configuration within 3 MHz channel with punctured PBCH defined in TS 38.211 [9] clause 7.4.3.1.
921.45	41638	Only applicable for 20 PRB transmission bandwidth configuration within 5 MHz channel with unpunctured PBCH defined in TS 38.211 [9] clause 7.4.3.1.

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

NR operating band	SS Block SCS	SS Block pattern (NOTE 1)	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	30 kHz	Case A	2177 – <1> – 2230
		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
n13	15 kHz	Case A	1871 – <1> – 1885
n14	15 kHz	Case A	1901 – <1> – 1915
n18	15 kHz	Case A	2156 – <1> – 2182
n20	15 kHz	Case A	1982 – <1> – 2047
n24	15 kHz	Case A	3818 – <1> – 3892
n24	30 kHz	Case B	3824 – <1> – 3886
n25	15 kHz	Case A	4829 – <1> – 4981
n26	15 kHz	Case A	2153 – <1> – 2230
n28	15 kHz	Case A	1901 – <1> – 2002
n29	15 kHz	Case A	1798 – <1> – 1813
n30	15 kHz	Case A	5879 – <1> – 5893
n31	15 kHz	Case A	1161 – <1> – 1162
n34	15 kHz	Case A	NOTE 3
	30 kHz	Case C	5036 – <1> – 5050
n38	15 kHz	Case A	NOTE 2
	30 kHz	Case C	6437 – <1> – 6538
n39	15 kHz	Case A	NOTE 4
	30 kHz	Case C	4712 – <1> – 4789
n40	30 kHz	Case C	5762 – <1> – 5989
n41	15 kHz	Case A	6246 – <3> – 6717
	30 kHz	Case C	6252 – <3> – 6714
n46⁵	30 kHz	Case C	8993 – <1> – 9530
n48	30 kHz	Case C	7884 – <1> – 7982
n50	30 kHz	Case C	3590 – <1> – 3781
n51	15 kHz	Case A	3572 – <1> – 3574
n53	15 kHz	Case A	6215 – <1> – 6232
	30 kHz	Case C	6221 – <1> – 6226
n54	15 kHz	Case A	4181 – <1> – 4182
n65	15 kHz	Case A	5279 – <1> – 5494
n66	15 kHz	Case A	5279 – <1> – 5494
	30 kHz	Case B	5285 – <1> – 5488
n67	15 kHz	Case A	1850 – <1> – 1888
n70	15 kHz	Case A	4993 – <1> – 5044
n71	15 kHz	Case A	1547 – <1> – 1624
n72	15 kHz	Case A	1157 – <1> – 1159
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> – 8880⁷
			8475 – <1> – 8884⁸
n85	15 kHz	Case A	1826 – <1> – 1858
n90	15 kHz	Case A	6246 – <1> – 6717¹⁰
	15 kHz	Case A	6245 – <1> – 6718¹¹
	30 kHz	Case C	6252 – <1> – 6714
n91	15 kHz	Case A	3572 – <1> – 3574
n92	15 kHz	Case A	3584 – <1> – 3787
n93	15 kHz	Case A	3572 – <1> – 3574
n94	15 kHz	Case A	3584 – <1> – 3787
n96⁶	30 kHz	Case C	9531 – <1> – 10363
n100	15 kHz	Case A	2303 – <1> – 2307, 41638¹²
n101	15 kHz	Case A	4754 – <1> – 4768
n101	30 kHz	Case C	4760 – <1> – 4764
n102⁹	30 kHz	Case C	9531 – <1> – 9877
n104	30 kHz	Case C	9882 – <7> – 10358
n105	15 kHz	Case A	1535 – <1> – 1624
n109	15 kHz	Case A	3584 – <1> – 3787
NOTE 1: SS Block pattern is defined in clause 4.1 in TS 38.213 [10]. NOTE 2: The applicable SS raster entries are GSCN = {6432, 6443, 6457, 6468, 6479, 6493, 6507, 6518, 6532, 6543} NOTE 3: The applicable SS raster entries are GSCN = {5032, 5043, 5054} NOTE 4: The applicable SS raster entries are GSCN = {4707, 4715, 4718, 4729, 4732, 4743, 4747, 4754, 4761, 4768, 4772, 4782, 4786, 4793} NOTE 5: The following GSCN are allowed for operation in band n46:GSCN = {8996, 9010, 9024, 9038, 9051, 9065, 9079, 9093, 9107, 9121, 9218, 9232, 9246, 9260, 9274, 9288, 9301, 9315, 9329, 9343, 9357, 9371, 9385, 9402, 9416, 9430, 9444, 9458, 9472, 9485, 9499, 9513}. NOTE 6: The following GSCN are allowed for operation in band n96: GSCN = { 9548, 9562, 9576, 9590, 9603, 9617, 9631, 9645, 9659, 9673, 9687, 9701, 9714, 9728, 9742, 9756, 9770, 9784, 9798, 9812, 9826, 9840, 9853, 9867, 9881, 9895, 9909, 9923, 9937, 9951, 9964, 9978, 9992, 10006, 10020, 10034, 10048, 10062, 10076, 10090, 10103, 10117, 10131, 10145, 10159, 10173, 10187, 10201, 10214, 10228, 10242, 10256, 10270, 10284, 10298, 10312, 10325, 10339, 10353}. NOTE 7: The SS raster entries apply for channel bandwidths larger than or equal to 40 MHz. NOTE 8: The SS raster entries apply for channel bandwidths smaller than 40 MHz. NOTE 9: The following GSCN are allowed for operation in band n102: GSCN = {9535, 9548, 9562, 9576, 9590, 9603, 9617, 9631, 9645, 9659, 9673, 9687, 9701, 9714, 9728, 9742, 9756, 9770, 9784, 9798, 9812, 9826, 9840, 9853, 9867} NOTE 10: The SS raster entries apply for channel bandwidths larger than or equal to 10 MHz. NOTE 11: The SS raster entries apply for channel bandwidth equal to 5 MHz. NOTE 12: Only applicable for 20 PRB transmission bandwidth configuration within 5 MHz channel with unpunctured PBCH defined in TS 38.211 [9] clause 7.4.3.1.

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

NR operating band	SS Block SCS	SS Block pattern (note 1)	Range of GSCN (First – <Step size> – Last)
n257	120 kHz	Case D	22388 – <1> – 22558
	240 kHz	Case E	22390 – <2> – 22556
n258	120 kHz	Case D	22257 – <1> – 22443
	240 kHz	Case E	22258 – <2> – 22442
n259	120 kHz	Case D	23140 – <1> – 23369
	240 kHz	Case E	23142 – <2> – 23368
n260	120 kHz	Case D	22995 – <1> – 23166
	240 kHz	Case E	22996 – <2> – 23164
n261	120 kHz	Case D	22446 – <1> – 22492
	240 kHz	Case E	22446 – <2> – 22490
n262	120 kHz	Case D	23586 – <1> – 23641
	240 kHz	Case E	23588 – <2> – 23640
n263	120 kHz	Case D	Table 5.4.3.3-3
	480 kHz	Case F
	960 kHz²	Case G	24162 – <6> – 24954
NOTE 1: SS Block pattern is defined in section 4.1 in TS 38.213 [10]. NOTE 2: SS Block SCS of 960 kHz is not used for initial access.

Table 5.4.3.3-3: Allowed GSCN for operation in band n263 for 120 kHz and 480 kHz

SS Block SCS	Range of GSCN
120 kHz	24156 + 6 * N – 3 * floor((N+5)/18), N=0:137
480 kHz	24162 + 24 * N – 12 * floor((N+4)/18), N=0:33

Table 5.4.3.3-4: Applicable SS raster entries per operating band (FR1) for 3 MHz channel bandwidth

NR operating band	SS Block SCS	SS Block pattern (NOTE 1)	Range of GSCN (First – <Step size> – Last)
n26	15 kHz	Case A	30937 – <1> – 31100
n28	15 kHz	Case A	30432 – <1> – 30644
n31	15 kHz	Case A	28955 – <1> – 28967
n72	15 kHz	Case A	28947 – <1> – 28959
n85	15 kHz	Case A	30282 – <1> – 30359
n100	15 kHz	Case A	31240 – <1> – 31242, 31244 – <1> – 31253, 41637²
n106	15 kHz	Case A	31317 – <1> – 31329
NOTE 1: SS Block pattern is defined in clause 4.1 in TS 38.213 [10]. NOTE 2: Only applicable for 12 PRB transmission bandwidth configuration within 3 MHz channel with punctured PBCH defined in TS 38.211 [9] clause 7.4.3.1.

Update1: Update to 3GPP 38.104 Release 17 v 17.2.0 (2021-07)

Update 2: ADD button to export result

Update2: Update to 3GPP 38.104 Release 18 v 18.7.0 (2024-09)

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Comments 12

Richard Zhang

January 4, 2021 at 14:36

In 5G NR SSref (SSB) ARFCN to GSCN Calculator:
when arfcn is 249,250,251, all return GSCN as 2.
GSCN 2 is only mapped to arfcn 250, right?

Junho Park

April 12, 2022 at 08:57

Hi guys,

when I find GSCN greater than 4800Mhz in n79, “5G NR GSCN to SSref (SSB) Frequency Calculator” made the proper ARFCN and MHz result.

However, when I put the ARFCN and MHz result to “5G NR SSref (SSB) Frequency to GSCN Calculator” and “5G NR SSref (SSB) ARFCN to GSCN Calculator”, the result show “not standart”.

For example, GSCN 8784 is 4850.4Mhz and ARFCN 723360.
However when I put 4850.4 Mhz and ARFCN 723360, the result is “not stadrt” and nearest GSCN shows 8784.

Could you explain why the result shows like that?

Thank you!

- OlegV@5GTools
  
  September 8, 2022 at 11:07
  
  Dear, Junho Park!
  it was a mathematical mistake 🙂
  I fixed it.
  Regards, Oleg
  
Robert Clark

April 17, 2023 at 11:46

Hi,
I have a question. Is it OK to use a non standard frequency for SSB?
E.g. 2249999 ARFCN. Nearest standard SSB ARFCN is 2249947.
Thank you
Rob

Jiten

May 15, 2023 at 15:00

Hi I am trying to pic n2. If I take GSCN format frequency then https://www.sqimway.com/nr_band.php is showing that its is applicable. Arfcn not applicable, not a multiple of step size Nref.
I want to select 1950.05MHz

- OlegV@5GTools
  
  June 4, 2023 at 17:01
  
  Dear, Jiten!
  Thanks, You a right about Nref… You can calculate GSCN Arfcn at our calculator, but for band n2 that Arfcn not applicable.
  Later I will make a Note when calculating
  Regards, Oleg
  
Charles Wingstrom

August 18, 2023 at 22:43

Hi,
How are you able to calculate the next valid GSCN if a non standard SSB ARFCN is entered?
Thanks

Johan Lundberg

November 28, 2024 at 13:05

Is there an API behind this tool that we can access? The would enable integration with our automation services.

Bojan

April 18, 2025 at 21:23

Calculation does not account for GSCN step size being 1 in Release 17 for n79 band, when smaller channel BW are used. Can you please update your calculator to be in line with Rel 17 specification. Thank you in advance

- HSKIM
  
  April 24, 2025 at 04:24
  
  I had the same experience.
  8475~8480 – 8880~8884 are normal.
  And, in 8480 ~ 8880, it is only entered as step size .
  Is this correct?
  
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