A.62 Monitoring of round-trip delay between PSA UPF and NG-RAN

28.5523GPP5G performance measurementsManagement and orchestrationRelease 18TS

The end to end delay in 5G networks between UE and PSA UPF has direct impact to users’ experience for some types of services (e.g., URLLC). The delay between PSA UPF and NG-RAN is part of the end to end one-way delay and is not expected very long comparing to the delay in between NG-RAN and UE.

In case the PSA UPF and NG-RAN are not time synchronised, the round-trip delay can be measured at PSA UPF.

The measurements on the round-trip delay between PSA UPF and NG-RAN can be used to evaluate and optimize the DL and UL user plane delay performance between 5GC and NG-RAN.