In this test case, ABot can simulate the gNodeB and UE and any other NFs of the 5G like AMF, AUSF, UDM, UDR, NSSF, UPF1, UPF2.

The prerequisites for this scenario are: i) NGAP Setup is done between gNodeB/AMF and ii) UE Completed an Initial Registration procedure and PDU session procedure.

iii) UE in cm-connected state.

Now, SMF decides to change UPF Anchor for the existing sessions.

The procedures completed in this test case are-

• NG Setup
• Initial Registration with successfully 5G-AKA authentication procedure.
• PDU Session Establishment with SSC Mode 3.
• Now, PDU Session Re-establishment with UPF2.
• Old PDU Session Release

This test case is as per 3GPP Spec: TS 24.501, TS 23.502, TS 23.501 Rel-15.7