A.11 N3 data volume related measurements
28.5523GPP5G performance measurementsManagement and orchestrationRelease 18TS
N3 related measurements are used to measure data volume on N3 interface including incoming and outgoing of GTP data packets in total and per QoS level without counting the mandatory part of the GTP-U header
It is useful to analyse transport bandwidth usage of N3 interface in total and QoS level granularity. If the transport bandwidth usage is too high, more bandwidth should be deployed, or load balance should be considered according to core network dimension if there are multiple UPFs connected to multiple gNodeBs. Decision on the additional bandwidth provisioning or load balancing can be made in more fine grained level due to the QoS level measurement.
So it is necessary to define N3 related measurements.