Measurement of DL packet loss of data service

Hello Experts.
In PRS kindly assit what this kpi is measuring:

DL packet loss of data service.

Is it measuring between MME and eNodeB?

its for Uu interface

DL Packet Loss (QCI9)=L.Traffic.DL.PktUuLoss.Loss.QCI.9 / L.Traffic.DL.PktUuLoss.Tot

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