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TS 37.340
E-UTRA and NR – Multi-connectivity – Overall description – Stage 2

V18.5.0 (PDF)  2025/03  143 p.
V17.8.0  2024/12  122 p.
V16.13.0  2023/09  92 p.
V15.16.0  2022/03  75 p.
Rapporteur:
Mr. Parolari, Sergio
ZTE Corporation

essential Table of Contents for  TS 37.340  Word version:  18.5.0

each title, in the "available" or "not available yet" area, links to the equivalent title in the CONTENT
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List of Figures and Tables

Figure 4.1.2-1EN-DC Overall Architecture
Figure 4.2.1-1Control plane architecture for EN-DC (left) and MR-DC with 5GC (right)
Figure 4.2.2-1Radio Protocol Architecture for MCG, SCG and split bearers from a UE perspective in MR-DC with EPC (EN-DC)
Figure 4.2.2-2Radio Protocol Architecture for MCG, SCG and split bearers from a UE perspective in MR-DC with 5GC (NGEN-DC, NE-DC and NR-DC)
Figure 4.2.2-3Network side protocol termination options for MCG, SCG and split bearers in MR-DC with EPC (EN-DC)
Figure 4.2.2-4Network side protocol termination options for MCG, SCG and split bearers in MR-DC with 5GC (NGEN-DC, NE-DC and NR-DC)
Figure 4.3.1.1-1C-Plane connectivity for EN-DC (left) and MR-DC with 5GC (right)
Figure 4.3.2.1-1U-Plane connectivity for EN-DC (left) and MR-DC with 5GC (right)
Figure 7.12-1F1-C transfer in NR-DC; a) Scenario 1; b) Scenario 2
Figure 10.2.1-1Secondary Node Addition procedure
Figure 10.2.1-2Conditional Secondary Node Addition procedure
Figure 10.2.2-1SN Addition procedure
Figure 10.2.2-2Conditional Secondary Node Addition procedure
Figure 10.3.1-1SN Modification procedure - MN initiated
Figure 10.3.1-2SN Modification procedure - SN initiated with MN involvement
Figure 10.3.1-3SN modification - SN initiated without MN involvement
Figure 10.3.1-3aSN Modification - SN-initiated without MN involvement and SRB3 is used to configure intra-SN CPC
Figure 10.3.1-4Transfer of an NR RRC message to/from the UE
Figure 10.3.1-5SN Modification - SN-initiated without MN involvement and SRB3 is not used to configure intra-SN CPC
Figure 10.3.2-1SN Modification procedure - MN initiated
Figure 10.3.2-2SN Modification procedure - SN initiated with MN involvement
Figure 10.3.2-3SN Modification - SN initiated without MN involvement
Figure 10.3.2-3aSN Modification - SN-initiated without MN involvement and SRB3 is used to configure intra-SN CPC or intra-SN subsequent CPAC
Figure 10.3.2-3bSN Modification - SN-initiated without MN involvement and SRB3 is used to configure intra-SN SCG LTM
Figure 10.3.2-4Transfer of an NR RRC message to/from the UE
Figure 10.3.2-5SN Modification - SN-initiated without MN involvement and SRB3 is not used to configure intra-SN CPC or intra-SN subsequent CPAC
Figure 10.3.2-6SN Modification - SN-initiated without MN involvement and SRB3 is not used to configure intra-SN SCG LTM
Figure 10.4.1-1SN Release procedure - MN initiated
Figure 10.4.1-2SN Release procedure - SN initiated
Figure 10.4.2-1SN release procedure - MN initiated
Figure 10.4.2-2SN release procedure - SN initiated
Figure 10.5.1-1SN Change - MN initiated
Figure 10.5.1-2SN Change - SN initiated
Figure 10.5.1-3Conditional SN Change - MN initiated
Figure 10.5.1-4Conditional SN Change - SN initiated
Figure 10.5.2-1SN change procedure - MN initiated
Figure 10.5.2-2SN change procedure - SN initiated
Figure 10.5.2-3Conditional SN change procedure - MN initiated
Figure 10.5.2-4Conditional SN change procedure - SN initiated
Figure 10.7.1-1Inter-MN handover with/without MN initiated SN change
Figure 10.7.2-1Inter-MN handover with/without MN initiated SN change procedure
Figure 10.8.1-1Master Node to eNB Change procedure
Figure 10.8.2-1MN to ng-eNB/gNB Change procedure
Figure 10.9.1-1eNB to Master Node change
Figure 10.9.2-1ng-eNB/gNB to MN change procedure
Figure 10.10.1-1RRC Transfer procedure for the split SRB (DL operation)
Figure 10.10.1-2RRC Transfer procedure for the split SRB (UL operation)
Figure 10.10.1-3RRC Transfer procedure for NR measurement report, NR failure information, NR UE assistance information, NR IAB other information or intra-SN CPC execution completion
Figure 10.10.1-4RRC Transfer procedure for MCG failure information
Figure 10.10.2-1RRC Transfer procedure for split SRB (DL operation)
Figure 10.10.2-2RRC Transfer procedure for split SRB (UL operation)
Figure 10.10.2-3RRC Transfer procedure for SN measurement report, failure information report, SN UE assistance information, intra-SN CPC execution completion, intra-SN subsequent CPAC without MN involvement execution completion or IAB other information
Figure 10.10.2-4RRC Transfer procedure for MCG failure information
Figure 10.10.2-5RRC Transfer procedure for supporting scenario 2 of F1-C traffic transfer in NR-DC
Figure 10.11.1-1Secondary RAT data volume periodic reporting - EN-DC
Figure 10.11.2-1Secondary RAT data volume periodic reporting - MR-DC with 5GC
Figure 10.12.1-1Support of Activity Notification in EN-DC
Figure 10.12.1-2Support of Activity Notification in EN-DC with suspended RRC connection - SCG configuration released in SN
Figure 10.12.1-3Support of Activity Notification in EN-DC with suspended RRC connection - SCG configuration suspended in SN
Figure 10.12.2-1Support of Activity Notification in MR-DC with 5GC
Figure 10.12.2-2Support of Activity Notification in MR-DC with 5GC with RRC_Inactive - SCG configuration released in SN
Figure 10.12.2-3Support of Activity Notification in MR-DC with 5GC with RRC_Inactive - SCG configuration suspended in SN
Figure 10.13.2-1Notification Control Indication procedure
Figure 10.14.1-1PDU Session Split at UPF during PDU session resource setup
Figure 10.14.2-1PDU Session Split at UPF during PDU session resource modify
Figure 10.14.3-1PDU Session Split at UPF during RAN initiated PDU session resource modify (QoS flows offloading from MN to SN)
Figure 10.14.4-1PDU Session Split at UPF during RAN initiated PDU session resource modify (QoS flows offloading from SN to MN)
Figure 10.15-1F1-C Traffic Transfer procedure in EN-DC
Figure 10.15-2F1-C Traffic Transfer procedure for scenario 1 of F1-C traffic transfer in NR-DC
Figure 10.16.2-1Inter-system handover from EPS to 5GS with the Secondary Node used as target
Figure 10.16.3-1Inter-system handover from 5GS to EPS with the Source Node used as target Secondary Node
Figure 10.17.1-1Inter-MN RRC Resume without MN initiated SN change procedure
Figure 10.19.1-1Conditional Handover with Secondary Node procedure
Figure 10.19.2-1Conditional Handover with Secondary Node procedure
Figure 10.20-1Subsequent CPAC - MN initiated
Figure 10.20-2Subsequent CPAC - SN initiated
Figure 10.20-3Intra-SN subsequent CPAC - SN initiated with MN involvement
Table A-1L2 handling for bearer type change with and without a security key change due to a change of the termination point
Table B-1Supported MR-DC handover scenarios

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