5G throughput is degraded with high iBLER / Retransmission in DL

Hi Experts.

Kindly help me out with below issue:

  1. 5G throughput is degraded
  2. High iBLER rate in DL
  3. High retransmission in DL

Any suggestion is welcome.

Same like in LTE: check your RSRQ, check your SINR SSB, check PDSCH SINR (CQI reported by UE).

BLER is very high mainly two slots 1 and 11.
But could not found any interference in FFT traces.

Check EVM.

How many SSB in this cell?
Any special channel/signal configured on slot 1,11?