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

Hello Experts,

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

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.