Iin RRC / SIB / NAS messages what does Need S and Need R means?
These are need codes.
You can get details from 38.331 Meaning of Abbreviations.
- S: Specified- That specifies UE behavior upon field absent
- M:Maintain- To maintain current value in absence
- N: No action- Upon missing optional field, no action from UE
- R: Release- If value absent, release previous value