Hi.
No , UE cannot decode the SCELL common search space. Because it is not going to receive any common message in Scell like Paging and SIB. So UE doesn't decode common search space in Scell.
How does UE gets this configuration?
Pcell will be expecting the HARQ feedback of Scell but UE failed to decode the Scell PDCCH . This case UE doesn't send the CA HARQ and uses different PUCCH format But PCELL will be expecting different format to receive the feedback. How to overcome this issue.