Hello Experts.
I have received below question many times during 5G-NR launching phase which is “How to calculate Global Synchronisation Channel Number (GSCN) as needed input during 5G-NR cell launching?”
Below article will answer on your question 
The GSCN is similar to the concept of the channel raster in LTE, where the channel raster is 100 kHz.
However, in 5G NR, the frequency interval of the channel raster is not fixed at 100 kHz like LTE.
Due to the narrower frequency range of 5G, scanning every 100 kHz interval would be time-consuming and impact UE performance.
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