Offline Usage Report in N4 Session Deletion Response

The following call flow and procedure describes the Usage report in Session Deletion Response.

Note
Ensure that the UE or Network Initiated delete session is detected at the SMF.
Call Flow for Usage Report in N4 Delete Session Response
Call Flow Description for Session Deletion Response
Step Description
1

SMF initiates N4 Session Deletion Request to delete the session to the UPF.

2

UPF sends N4 Session Deletion Response with offline Usage report.

3

SMF sends GTPP Data Transfer Request with or without SDF Containers.

  • If the offline Usage report is received in the N4 Session Deletion Response, then SMF sends the GTPP Data Record Transfer Request for default with SDFs container(with volume usage and serviceConditionChange—one for each RG+service ID.

  • If the offline Usage report is received without measurement in the N4 Session Deletion Response and no offline Volume/Time threshold usage report received before detach, then the GTPP Data Record Transfer message with recordClosureReason “NormalRelease” without SDF Containers gets exchanged with OFCS.

  • If any offline Volume/Time threshold Usage report is received before detach and no offline Usage report in the N4 Delete Session Response received, then the GTPP Data Record Transfer gets exchanged without SDF Containers for record closure.

4

SMF receives GTPP Data Record Transfer Response from OFCS.