Section: 5.7.1.6 DL traffic
Content: The following characteristics apply for processing of DL traffic: - UPF maps User Plane traffic to QoS Flows based on the PDRs. - UPF performs Session-AMBR enforcement as specified in clause 5.7.1.8 and performs counting of packets for charging. - UPF transmits the PDUs of the PDU Session in a single tunnel between 5GC and (R)AN, the UPF includes the QFI in the encapsulation header. In addition, UPF may include an indication for Reflective QoS activation in the encapsulation header. - UPF performs transport level packet marking in DL on a per QoS Flow basis. The UPF uses the transport level packet marking value provided by the SMF (as described in clause 5.8.2.7). - (R)AN maps PDUs from QoS Flows to access-specific resources based on the QFI and the associated 5G QoS profile, also taking into account the N3 tunnel associated with the DL packet. NOTE: Packet Filters are not used for the mapping of QoS Flows onto access-specific resources in (R)AN. - If Reflective QoS applies, the UE creates a new derived QoS rule as defined in clause 5.7.5.2.