UECM Errors

The following errors are expected on UECM interface during the POST Operation, and causes the actions described below:

UECM Errors - 1
Application Error

Description

NAS Cause Code/Action

403 Forbidden

UNKNOWN_5GS_SUBSCRIPTION

No 5GS subscription is associated with the user.

#7, 5GS services not allowed

NO_PS_SUBSCRIPTION

No PS (5GS, EPS, GPRS) subscription is associated with the user.

#7, 5GS services not allowed

ROAMING_NOT_ALLOWED

The subscriber is not allowed to roam within that PLMN.

#13, Roaming not allowed in the tracking area

ACCESS_NOT_ALLOWED

Access type is not allowed for the user.

#7, 5GS services not allowed

RAT_NOT_ALLOWED

RAT is not allowed for the user.

#7, 5GS services not allowed

INVALID_GUAMI

The AMF is not allowed to modify the registration information stored in the UDM as it is not the registered AMF.

#15, No suitable cells in tracking area

404 Not Found

USER_NOT_FOUND

The user does not exist in the HPLMN.

#7, 5GS services not allowed

CONTEXT_NOT_FOUND

It is used when no corresponding context exists.

#15, No suitable cells in tracking area

The following errors are not expected. If they occur, it is due to a logic error. Since AMF always rejects a message in this state, the error should be logged, and the call must be rejected with NO SUITABLE CELLS IN TRACKING AREA.

UECM Errors - 2
Application Error

Description

Response to UE

422 Unprocessable Entity

UNPROCESSABLE_REQUEST

The request cannot be processed due to semantic errors when trying to process a patch method.

Registration Reject with Cause #111, protocol error unspecified