Hi Experts.
I am facing VoLTE call congestion on high utilization sites.
What could be the reason of this cause for GBR service.
Does it happens suddenly or is it from long time?
Suddenly when traffic and users increased.
Ok, then you can play with traffic and user Balance.
These are ericsson parameter, you can check and tune:
To understand these parameters in detail, you need to spend 17 minutes here: 4G Ericsson Accessibility KPI Optimization - YouTube
Yes, need to balance the user based SR values across cells.
Can not be more than say 2000-3000 users or 700-800 user per cell.
Once this limit touches you will get rejection and alarm PUCCH error.