6.5 5GSM status procedure

24.5013GPPNon-Access-Stratum (NAS) protocol for 5G System (5GS)Release 18Stage 3TS

6.5.1 General

The purpose of the sending of the 5GSM STATUS message is to report at any time certain error conditions detected upon receipt of 5GSM protocol data. The 5GSM STATUS message can be sent by both the network and the UE (see example in figure 6.5.1.1).

Figure 6.5.1.1: 5GSM status procedure

6.5.2 5GSM status received in the UE

If the 5GSM entity of the UE receives a 5GSM STATUS message the UE shall take different actions depending on the received 5GSM cause value:

#47 PTI mismatch.

The UE shall abort any ongoing 5GSM procedure related to the received PTI value and stop any related timer.

#81 invalid PTI value.

The UE shall abort any ongoing 5GSM procedure related to the received PTI value and stop any related timer.

#97 Message type non-existent or not implemented.

The UE shall abort any ongoing 5GSM procedure related to the PTI or PDU session ID and stop any related timer.

On receipt of a 5GSM STATUS message with any other 5GSM cause value no state transition and no specific action shall be taken as seen from the radio interface, i.e. local actions are possible.

6.5.3 5GSM status received in the SMF

If the SMF receives a 5GSM STATUS message the SMF shall take different actions depending on the received 5GSM cause value:

#43 invalid PDU session identity.

The SMF shall abort any ongoing 5GSM procedure related to the PTI or PDU session ID, stop any related timer and locally release the PDU session indicated in the 5GSM STATUS message.

#47 PTI mismatch.

The SMF shall abort any ongoing 5GSM procedure related to the received PTI value and stop any related timer.

If the PTI indicated in the 5GSM STATUS message is related to a PDU SESSION ESTABLISHMENT ACCEPT message, the SMF shall perform a local release of the PDU session indicated in the PDU SESSION ESTABLISHMENT ACCEPT message.

#81 invalid PTI value.

The SMF shall abort any ongoing 5GSM procedure related to the received PTI value and stop any related timer.

#96 invalid mandatory information.

The SMF shall abort any ongoing 5GSM procedure related to the PTI or PDU session ID and stop any related timer.

#97 message type non-existent or not implemented.

The SMF shall abort any ongoing 5GSM procedure related to the PTI or PDU session ID and stop any related timer.

The local actions to be taken by the SMF on receipt of a 5GSM STATUS message with any other 5GSM cause value are implementation dependent.