A.10 Use case of Bit Error Rate and BLER

32.4053GPPPerformance Management (PM)Performance measurementsRelease 17Telecommunication managementTSUniversal Terrestrial Radio Access Network (UTRAN)

Bit Error Rate and BLER is very useful to evaluate service quality per traffic class, if Bit Error Rate and BLER is higher than threshold, it possibly leads to call drop. It is also useful to evaluate the effect of power control, such as for open loop power control, if initial SIR target is not set properly, Bit Error Rate or BLER will be very high and reduced slowly. So it is necessary to define BLER related measurements.

From above, use case of Bit Error Rate and BLER related measurement is not like radio resource management in RNC equipment, only some performance is learned from Bit Error Rate or BLER distribution. So according to network optimization experience, 10 subcounters for Bit Error Rate or 20 subcounters for BLER are proposed and the granularity is larger than definition of measurement report.