Section: 10.16 Support of inter-system handover involving EN-DC or MR-DC with 5GC 10.16.1 General
Content: Inter-system handover is specified in TS 23.501[ System architecture for the 5G System (5GS) ]  [11] and TS 23.502[ Procedures for the 5G System (5GS) ]  [20]. Data forwarding for inter-system handover is specified in TS 38.300[ NR; NR and NG-RAN Overall description; Stage-2 ]  [3] and clause 8.4. Inter-system Inter-Master node handover with/without SN change is not supported in this version of the protocol (e.g. no transition from EN-DC to NGEN-DC or NR-DC). Inter-system HO from NR to E-UTRA with EN-DC configuration is supported in this version of the specification. N26 based inter-system HO will be executed between source RAN and gNB. Inter-system HO from E-UTRA connected to 5GC to E-UTRA with EN-DC configuration is not supported. Inter-system HO from E-UTRA with EPC to MR-DC with 5GC is not supported. Inter-system handover with source gNB and the target en-gNB or the source en-gNB and the target gNB being realised within the same network entity is supported in this version of the specification as described in clause 10.16.2 and clause 10.16.3.