 10. The Create Session Response is then sent from the SAEGW-C to the MME, which contains an acknowledgment of the successful or unsuccessful session setup with an appropriate response code. This also contains the 5G-like APN-AMBR values. 11. The MME then sends an Initial Context Setup Request with the NAS container with Attach Accept to the master eNB. This again contains the new 5G parameters of Extended UE Aggregate Bit Rate Uplink and Downlink. 5G NSA - option 3 call flows 5G NSA - Call Flows - Initial Registration M-eNB S-EN-gNB SAEGW-C SAEGW-U PFCP: Session Establishment Request PFCP: Session Establishment Response PFCP: Session Modification Request PFCP: Session Modification Response GTPv2 Create Session Response AMBR IE (5G like APN-AMBR) Initial Context Setup Request [Attach Accept] [Activate Default Bearer Request (APN-AMBRIE}] Extended UE Aggregate Maximum Bit Rate Downlink IE (UE AMBR Downlink # 10 Gbps), Extended UE Aggregate Maximum Bit Rate Uplink IE (UE AMBR Uplink = 10 Gbps} [Attach Accept] [[Activate Default Bearer Request] [MeasObjectNR-15 (carrierFreq-r15)] EPS Radio Bearer Identity, RLC Mode, PDCP Sequence Number Initial Context Setup Response F-TEID of Master Node eNB Uplink NAS Transport [Attach Complete] [Activate Default Bearer Accept] Modify Bearer Request F-TEID of Master Node eNB Figure 10.9 - Option 3x call flow part 2 12. The Attach Accept is then sent to the UE from the master eNB. 13. The MME then sends an Initial Context Setup Response containing the F-TEID of master node eNB. 14. The UE sends a NAS message with Attach Complete and Activate Default Bearer Accept to the eNB, which is carried transparently to the MME. 15. The MME then sends a Modify Bearer Request; this message contains the F-TEID information received from the eNB in the Initial Context Setup Response message: 5G Non-Standalone Networks 5G NSA - Call Flows - Initial Registration M-eNB S-EN-gNB SAEGW-C SAEGW-U PFCP: Session Modification Request PFCP: Session Modification Response GTPv2: Modify Bearer Response F-TEID 