A.9 Use case of SIR

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

SIR measurement is important to evaluate quality of the received signal and range of cell coverage.With the measured SIR compared to the SIR target of each traffic class, it can be determined whether the signal is decoded correctly or not. SIR target is used for out loop power control, and it is useful to learn the effect of power control, such as SIR is converged to SIR target quickly or not.

In order to reduce the number of SIR related measurement, according to network optimization experience, 0.5dB granularity of measurement is enough.