BLER (Block Error Rate) in LTE?

BLER (Block Error Rate) is the percentage of received transport blocks (TBs) that contain errors before Hybrid Automatic Repeat request (HARQ) retransmissions. It is a key metric for measuring the quality of the LTE radio link

Definition:

• Layer: MAC (Medium Access Control) & PHY (Physical Layer)
• Purpose: Monitors LTE link quality and helps optimize HARQ retransmissions.
• The UE or eNodeB calculates BLER by checking how many transport blocks fail CRC checks.
• If a transport block fails CRC, it is counted as an error.
• If BLER exceeds the threshold, HARQ retransmissions are triggered.

   BLER in QXDM & Performance Metrics:-

 

    

BLER Failure Causes & Debugging:-