Feature Description

The SMF with Legacy Interface supports the Packet Data Network (PDN) attach with Gz interface for a default Bearer to enable offline accounting functions.

How It Works

On receiving offline rules from the PCRF through Gx CCA-I, SMF with the Diameter interface creates offline URRs, maps to the corresponding charging buckets (SDFs), and sends N4EstablishmentRequest toward SMF with the Legacy Interface.

On receiving the Usage report for offline SDF/Bearer level URRs, in the N4 Delete Session Response from UPF, it sends the GTPP Data Record Transfer request toward GTPP. For more information about the Gz Usage Report, see the Subscriber Charging > Gz Usage Report Handling with GTPP section.

Use the PDN attach and detach with Gz inteface functionality to:

  • Attach Procedure with:

    • offline rules only (Gx+Gz)

    • offline and online rules (Gx+Gy+Gz)

  • Detach Procedure with:

    • offline rules only (Gx+Gz)

    • offline and online rules (Gx+Gy+Gz)