Sending the New GUTI to UE Call Flow

This section describes the Sending the New GUTI to UE call flow.

Note
The newly allocated GUTI value is sent to the UE using the Configuration Update Command message. The allocation of a new GUTI is possible after the Service Request procedure is complete.

The following call flow describes the 5G GUTI reallocation during the Service Request procedure.

Sending the New GUTI to UE Call Flow
Sending the New GUTI to UE Call Flow Description
StepDescription
1

The UE sends the Service Request procedure to the AMF to perform both or one of the following:

  • Establish the N1 NAS signaling connection.

  • Establish the UP resources for PDU sessions which are activated without UP resources.

2

After the Service Request procedure is complete, and the AMF is configured to reallocate a new GUTI, then the new GUTI is allocated and sent in the Configuration Update Command message to UE.

3

The UE acknowledges the new GUTI by sending the Configuration Update Acknowledgment message.