A. UE maps the QoS Flow identifier to a data radio bearer based on QFI-to-DRB mapping received from NG-RAN.

B. NG-RAN removes the QoS Flow identifier from the packet header and forwards the packet over the proper N3 GTP-U tunnel.

C. UE maps the uplink data packet to a QoS Flow based on QoS rules received from SMF.

D. NG-RAN marks the data packet with the proper DSCP value.