If no SR is configured at UE side, then IF UE triggeres RACH then what will be the MSG3 content? How ENB knows UE is triggering an RACH for UL grant?
In this case msg-3 would be MAC-CRNTI with/without data
And, msg-4 would be pdcch scrambled with CRNTI (as contention resolution)
eNB gets to know from Establishment Cause , which means that why UE need to connect to network.
If UE is in connected mode why it will go for RACH ? if it has to ask for grant it will ask in PUCCH resources right ?
weather it is RRCConnection request or direct NAS message as ULInfotransfer?