What causes of Bad DL SINR (Bad CQI) in LTE network?

4G LTE
2

Actually there are mainly two reasons for that bad DL CQI:

  1. In low load network (Non-BH):
  • RSRP_Overlap between serving and NBRs cells.
  • PCI Mod3 Clashes between serving & NBRs cells.
  • Bad RSRP level (less than -100)
  1. In high load network (BH) ::
  • Bad DL SINR so DL CQI due to high DL PRB consumption between serving and NBRs cells.