Section: 10.14.2 PDU Session Split at UPF during PDU session resource modify (5GC initiated)
Content: The 5GC may provide an additional UL TEID address during PDU Session Resource Modify in order to allow the MN to split the PDU session. The MN may perform the SN Addition or the MN-initiated SN Modification procedure. If the MN decides to split the PDU session, the MN provides a DL TEID address to be applied as the additional DL tunnel address and the QoS flows associated with that tunnel. Figure 10.14.2-1: PDU Session Split at UPF during PDU session resource modify 1. The 5GC provides an additional UL TEID address during PDU Session Resource Modify, to be applied as the additional NG-U tunnel in case the MN decides to split the PDU session. 2. The MN decides to setup two tunnels. If the new tunnel is to be setup at the SN, the MN uses the SN Addition procedure (as described in 10.2.2) or the MN-initiated SN Modification procedure (as described in 10.3.2) up to step 6, or up to step 8 if a QoS flow is moved to the SN and data forwarding applies. 3. The MN provides a DL TEID address to be applied as the additional DL tunnel address on the NG-U interface and the QoS flows associated with that tunnel.