Unsubscribe Counters (N28 Session Termination)

On receiving an N7 terminate request, PCF triggers an N28 Nchf_SpendingLimitControl_Unsubscribe request towards CHF for unsubscribing for changes in N28 counter information.

N28 Unsubscribe (N7 terminate)
N28 Unsubscribe (N7 terminate) Call Flow Description

Step

Description

1

The SMF sends a N7 Delete request to the PCF.

2

The PCF sends a Delete Session request to the CDL.

3

The PCF sends a N28 Unsubcribe request to the CHF.

4

The PCF forwards the N7 Terminate Success message to SMF.

5

If the unsubscribe request is successful, then the CHF sends the N28 Unsubscribe response to the CHF.