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 SSref (SSB) frequency and back (5G NR SSref frequency to 5G NR GSCN)

Example: 5G NR GSCN = 7725, 5G SSref 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 SSREFGSCNRange of GSCN
0 – 3000N * 1200 kHz + M * 50 kHz, N = 1:2499, M ϵ {1,3,5} (Note)3N + (M-3)/22 – 7498
3000 – 242503000 MHz + N * 1.44 MHz, N = 0:147567499 + N7499 – 22255
24250 – 10000024250.08 MHz + N * 17.28 MHz, N = 0:438322256 + N22256 – 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 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 15 kHz Case A 2177 – <1> – 2230
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
n13 15 kHz Case A 1871 – <1> – 1885
n14 15 kHz Case A 1901 – <1> – 1915
n18 15kHz CaseA 2156 – <1> – 2182
n20 15 kHz Case A 1982 – <1> – 2047
n24 15 kHz Case A 3818 – <1> – 3892
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
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
n46 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
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
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
n85 15 kHz Case A 1826 – <1> – 1858
n90 15 kHz Case A 6246 – <1> – 6717
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
n96 30 kHz Case C 9531 – <1> – 10363
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}.

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
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
NOTE: SS Block pattern is defined in section 4.1 in TS 38.213 [10].

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

Update 2: ADD button to export result

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Comments 8

  • 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?

    Reply

  • 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!

    Reply

  • 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

    Reply

  • 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

    Reply

    • 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

      Reply

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

    Reply

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

    Reply

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