30 Restoration of the SCEF

23.0073GPPRelease 18Restoration proceduresTS

30.1 Restart of the SCEF

When an SCEF restarts after failure and has lost all or parts of his data, it shall reply to a report from MME, SGSN or HSS containing a SCEF reference ID for which it has no data with an error cause "SCEF_REFERENCE_ID_UNKNOWN" in the reply indicating that the SCEF reference ID provided in the message does not exist in the SCEF.

If an HSS receives a reply message with error cause set to "SCEF_REFERENCE_ID_UNKNOWN", it shall stop reporting and delete the event localy.

If an MME/SGSN receives reply message with error cause set to "SCEF_REFERENCE_ID_UNKNOWN", it shall stop reporting, initiate a notification to the HSS with cause "SCEF_REFERENCE_ID_UNKNOWN" and delete the event.

An HSS receiving a notification with cause "SCEF_REFERENCE_ID_UNKNOWN", it shall delete the event localy.

30.1.1 Mobile Originated NIDD procedure

During the Mobile Originated NIDD procedure, if the MME receives a MO-Data-Answer from the SCEF with a failure cause that UE cannot be found, the MME shall deactivate the corresponding PDN connection towards the UE with the cause "re-activation required", or initiate an explicit detach procedure with reattached required procedure, as appropriate, see 3GPP TS 24.301 [19].