you may wonder why this Q now.
Because coming from 3G RAN side and moving to 4G Core side, I am not upto date with LTE RRC.
Now trying to understand the 5G RAN security.
Before that wanted to fill the LTE RAN security procedure GAP.
Correct me if I am wrong, I know ciphering and integrity is moved to PDCP from RRC in LTE.
Then my Q is, why is there no "Ciphering Activation time " in the RRC Connection Reconfig (for security mode command) in LTE ?
Basically in 3G, RRC suspends the RLC to get the sequence numbers . And puts these SNs (may add some offset, so the SNs used to send SMC are not included) in the Security mode
command in the IE, "Ciphering Activation time"
How does this happen in LTE ?