5G NR GSCN Calculator
Convert a Global Synchronization Channel Number (GSCN) into its exact SS/PBCH block (SSB) reference frequency across 0–100 GHz.
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Math
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Related
Enter parameters and click Calculate to view results
Formula & Theory
Sub-3 GHz: F = N × 1.2 + 0.05 MHz; 3–24.25 GHz: F = 3000 + (N - 7499) × 1.44 MHz; 24.25–100 GHz: F = 24250.08 + (N - 22256) × 17.28 MHzThis formula is used to calculate antenna parameters for 5g nr gscn calculator.
Overview
Use this 5G NR GSCN calculator to convert Global Synchronization Channel Numbers (GSCN) into exact SS/PBCH block (SSB) center frequencies in MHz and GHz according to 3GPP TS 38.104 specifications.
Input Guide
Enter GSCN (N_GSCN) exactly in the units shown by this 5g nr gscn. Check the operating band, unit prefix, and decimal position before calculating; these are the inputs used by the formula.
- GSCN (N_GSCN).
Output Guide
The results describe the calculated 5g nr gscn values for the inputs you entered. Check each value against the available space, selected components, feed system, and operating conditions before making a final design decision.
How This Calculator Works
The 5G NR GSCN uses Sub-3 GHz: F = N × 1.2 + 0.05 MHz; 3–24.25 GHz: F = 3000 + (N - 7499) × 1.44 MHz; 24.25–100 GHz: F = 24250.08 + (N - 22256) × 17.28 MHz. Supply GSCN (N_GSCN) in the displayed units, then use the calculated values as the first engineering target for this 5g nr design or analysis.
Design Notes
Unlike NR-ARFCN (which defines the center channel carrier), GSCN specifies the sparse synchronization raster where a 5G UE searches for the SS/PBCH block (SSB) during initial network acquisition.
Build and Tuning Notes
GSCN spacing is much coarser than channel ARFCN spacing to accelerate UE cell search times. In C-band (3–24.25 GHz), GSCNs are spaced by 1.44 MHz steps, while in mmWave (FR2), GSCNs are spaced by 17.28 MHz steps.
Frequently Asked Questions
What is the difference between NR-ARFCN and GSCN?
NR-ARFCN defines the exact center carrier frequency of an NR channel. GSCN defines the specific frequency location of the Synchronization Signal Block (SSB) scanned by UEs during cell search.
What is the maximum valid GSCN value in 3GPP TS 38.104?
Valid GSCN values range from 2 to 26,639, covering frequencies from 7.49 MHz up to 100 GHz.
What GSCN range corresponds to C-Band (n77 / n78)?
C-band SSBs fall into the 3 GHz to 24.25 GHz range, corresponding to GSCNs between 7,499 and 10,416.
Alex Warren
B.Sc. in Electrical & Electronic Engineering (EEE)
Alex specialises in antenna design and wave propagation. His expertise helps ensure these calculators present practical RF concepts, useful design estimates, and clear engineering guidance for students, HAM operators, and wireless professionals.