Understanding 5G PDU Session Establishment: QoS Flows, UPF Connectivity, and DRB Mapping

In the 5G NR ecosystem, a PDU Session serves as the critical logical link between the UE (User Equipment) and external Data Networks (DNN). Unlike traditional LTE bearers, a PDU Session provides a highly flexible framework for managing IP address allocation and specialized user-plane connectivity via the UPF. This architecture supports multiple QoS flows, allowing the network to...