5GSM Status is an error reporting message for the 5GS Session Management sublayer. Either side can send it when a 5GSM protocol error is detected and there is no more specific procedure response to use. The key diagnostic field is the 5GSM cause.

• Signaling Sequence
• Message Structure
  • Example : 5GSM Status

Signaling Sequence

5GSM Status is not a multi-step procedure. It is sent as a single error indication after a 5GSM message or state inconsistency is detected.

Message Structure

The 5GSM Status message contains the 5GSM header and a 5GSM cause IE. In trace analysis, the message before the status indication is usually the message that should be inspected first.

Example : 5GSM Status

The checked Amarisoft MME logs did not contain a decoded 5GSM Status instance, so the following is a constructed full-message example.

[NAS] UL 5GSM: 5GSM status
        Protocol discriminator = 0x2e (5GS Session Management)
        PDU session identity = 1
        Procedure transaction identity = 52
        Message type = 0xd6 (5GSM status)
        5GSM cause = 0x60 (Invalid mandatory information)