Section: 10.16.2 Inter-system handover from EPS to 5GS with the Secondary Node used as target
Content: Inter-system handover from EPS to 5GS with the Secondary Node used as target refers to a deployment scenario where the source en-gNB and the target gNB are realised within the same network entity. Figure 10.16.2-1: Inter-system handover from EPS to 5GS with the Secondary Node used as target - Step 1: The (source) eNB, performing EN-DC with the (source) en-gNB triggers handover preparation including the SgNB UE X2AP ID within the Source NG-RAN to Target NG-RAN Transparent Container. - Step 2: The target gNB infers from the received SgNB UE X2AP ID in the Handover Request message that direct data forwarding can be performed in a node-internal way. - Step 3: DL UP data is forwarded in a node-internal way for the SN terminated bearers. - Step 4: After the end marker has arrived from the SGW, the (target) gNB processes UP data from the UPF.