Call Flow

Deactivation of the User Plane Connection of a PDU Session Call Flow
Deactivation of the User Plane Connection of a PDU Session Call Flow Description

Step

Description

1

NF Service Consumer requests the SMF to deactivate the user plane connection of the PDU session by sending a POST request with the following information:

  • upCnxState attribute set to DEACTIVATED.

  • User location and user location timestamp.

  • Cause of the user plane deactivation. The cause may indicate a cause received from the 5G-AN or due to an AMF internal event.

  • Other information (if required).

2

SMF deactivates and releases the N3 tunnel of the PDU session after receiving such a request. SMF initiates PFCP session modification procedure towards UPF with downlink FAR updated with the following options:

  • Buffering Action is enabled without remote node “forwarding parameters” details like IP address and GTP-U F-TEID.

Note

NOCP (Notify the CP function) is not enabled. Support for notification is not available on SMF.

3

SMF sets the upCnxState attribute to DEACTIVATED for the PDU session after receiving successful response from UPF node.

4

SMF initiates 200 OK response including the upCnxState attribute set to DEACTIVATED towards AMF.