Can we release and add Scell on the same Scell index?
Yes, it’s possible.
Yes but in different RRC reconfig.
I think it should work in a single msg also.
What would be the issue with single RRC msg?
Yes, it is possible.
If there is SCell change, then eNB can remove existing Scell (Index1) and add second one with different PCI.
Yes, I would also think so.
Does scell id1 can be add and release in same message?
Yes, it can.