There are some limitation on L1 side to support all the N1 index. Basically N1 index differentiates the HARQ data from different users.
Hardly it supports below 10 user per SF.
I do not see any X2 interface message which has type PUCCH messages. How eNB exchange pucch information ?Which interfaces it uses?
How an UE gets NR cells, what kind of measurements needs to be configured?