SSB is just 20 PRBs in frequency and 4 symbols in time.
Oh so offsettopointa to know where carrier start?
Exactly.
Look to the picture and you might figure out what I mean:
Thank you all.
One last question: In which message UE received GSCN?
In no message.
This is mapped on every UE by firmware.
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It dont receive it,
It blindly detect SSB position,
So GSCN is just theoretical meaning?
GSCN is used when UE is powered ON.
It scans all possible locations to find an SSB.
All possible locations are all possible GSCNs.
If is the center of SSB the GSCN.
For me It was a complicated subject, it takes time with me to understand it → 5G SSB Detailed Explanation (Theory + Practical + Configuration recommendation)
GSCN is a list of frequency points that can be used to transmit synchronisation signals.
Think about as a different unit of measurement
The analogy of Arfcn and GSCN relation could be like centimeters and meters
The steps on every unit is different so for example in FR1 > 3 Ghz, 1 step on GSCN is equal to 96 steps on ARFCN
For NSA, the center of SSB in this range can be on any even ARFCN but to support SA it has to be on GSCN (i.e. possible once every 96 ARFCN). This help SA UE to blindly scan the band faster
GSCN is to get the SSB location that can be anywhere in the band if it is a valid GSCN.
“KSSB + offsetToPointA*12” tells how far your SSB’s starting point is from point A in terms of subcarriers.
If kSSB is zero then your SSB start is align to PRB boundary otherwise not.