Glossary

• DBUF: Software service responsible of implementing the UPF Downlink buffering feature

• DDN: Downlink Data Notification

• PCP: Programmable Control Plane team, now merged with PDP into SD-Fabric

• PDP: Programmable Data Plane team, now merged with PCP into SD-Fabric

• QFI: QoS Flow Identifier

• TOST: Trellis, ONOS, Stratum and Tofino, the predecessor of SD-Fabric (now obsolete)

• TNA: Tofino Native Architecture

• UPF: 5G User Plane Function

• UP4: P4 implementation of UPF of control-stack based on ONOS