What functionality is included in the User plane function (UPF)?

UPF: the following functionality is included in the User plane function (UPF):

  • Intra-/Inter-RAT mobility anchor point
  • Data Network’s external PDU Session point of interconnect
  • routing & forwarding of packet
  • Inspection of packet
  • User Plane part of policy rule enforcement
  • Lawful intercept
  • Reporting of usage of traffic
  • User plane QoS handling
  • Traffic verification of UL
  • uplink and downlink transport level packet marking
  • the packet buffering and data notification triggering in DL
  • one or more end marker sending and forwarding to the source NG-RAN node
  • ARP proxying