• 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