If CA working on site, below few observations:
- GBR data flow on Pcell only.
- PDCCH signalling through Pcell and Scell also possible depends on implementation.
- Scell carry non GBR data.
- UL data and signalling on Pcell.
- We can use separate HARQ feedback for Pcell and Scell using PUCCH format 1B.
Any additional inputs can be added/corrected by other experts?