Collision Handling
For the newly supported messages (node report and session report), the SMF triggers the PDU session release procedure. If the PDU session release procedure collides with the HO procedure, the SMF does not abort the HO procedure as the GTP-U peer IP changes during the HO. To achieve this, the PDU release procedure involves comparing the GTP-U peer IP address received in release request with the one present in the PDU session. If the two addresses are different, then the SMF aborts the release procedure.
Important | The collision handling depends on the arrival time of the incoming HO message and clear subscriber command triggered by node report. |