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TS 37.340  RAN2 ★
NR – Multi-connectivity – Overall description – Stage 2

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WI Acronym:  NR_newRAT-Core
Rapporteur:  Mr. Parolari, Sergio 
The present document provides an overview of the multi-connectivity operation using E-UTRA and NR radio access technologies. Details of the radio interface protocols are specified in companion specifications of the 36 and 38 series.

full Table of Contents for  TS 37.340  Word version:   16.0.0

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1 Scope  2 References  3 Definitions, symbols and abbreviations  4 Multi-Radio Dual Connectivity  5 Layer 1 related aspects  6 Layer 2 related aspects  7 RRC related aspects  8 Bearer handling aspects  9 Security related aspects  10 Multi-Connectivity operation related aspects  11 Service related aspects  12 X2/Xn Interface related aspects  13 Other aspects  A Layer 2 handling for bearer type change  B Supported MR-DC Handover Scenarios  C Change history 

 

1  Scope  Word-p. 6
2  References
3  Definitions, symbols and abbreviations  Word-p. 7
3.1  Definitions
3.2  Abbreviations  Word-p. 8
4  Multi-Radio Dual Connectivity
4.1  General
4.1.1  Common MR-DC principles
4.1.2  MR-DC with the EPC
4.1.3  MR-DC with the 5GC  Word-p. 9
4.1.3.1  E-UTRA-NR Dual Connectivity  Up
4.1.3.2  NR-E-UTRA Dual Connectivity
4.1.3.3  NR-NR Dual Connectivity
4.2  Radio Protocol Architecture
4.2.1  Control Plane
4.2.2  User Plane  Word-p. 10
4.3  Network interfaces  Word-p. 12
4.3.1  Control Plane
4.3.1.1  Common MR-DC principles
4.3.1.2  MR-DC with EPC  Word-p. 13
4.3.1.3  MR-DC with 5GC  Up
4.3.2  User Plane
4.3.2.1  Common MR-DC principles
4.3.2.2  MR-DC with EPC
4.3.2.3  MR-DC with 5GC
5  Layer 1 related aspects  Word-p. 14
6  Layer 2 related aspects
6.1  MAC Sublayer
6.2  RLC Sublayer
6.3  PDCP Sublayer
6.4  SDAP Sublayer  Word-p. 15
7  RRC related aspects
7.1  System information handling
7.2  Measurements
7.3  UE capability coordination  Word-p. 16
7.4  Handling of combined MN/SN RRC messages  Word-p. 17
7.5  SRB3
7.6  Split SRB  Word-p. 18
7.7  SCG/MCG failure handling
7.8  UE identities
7.9  Inter-node Resource Coordination  Up
8  Bearer handling aspects  Word-p. 19
8.1  QoS aspects
8.2  Bearer type selection  Word-p. 20
8.3  Bearer type change  Word-p. 21
8.4  User data forwarding  Word-p. 22
9  Security related aspects
10  Multi-Connectivity operation related aspects
10.1  General
10.2  Secondary Node Addition  Word-p. 23
10.2.1  EN-DC  Up
10.2.2  MR-DC with 5GC  Word-p. 24
10.3  Secondary Node Modification (MN/SN initiated)  Word-p. 26
10.3.1  EN-DC
10.3.2  MR-DC with 5GC  Word-p. 30
10.4  Secondary Node Release (MN/SN initiated)  Word-p. 34
10.4.1  EN-DC
10.4.2  MR-DC with 5GC  Word-p. 36
10.5  Secondary Node Change (MN/SN initiated)  Word-p. 38
10.5.1  EN-DC
10.5.2  MR-DC with 5GC  Word-p. 41
10.6  PSCell change  Word-p. 44
10.7  Inter-Master Node handover with/without Secondary Node change
10.7.1  EN-DC
10.7.2  MR-DC with 5GC  Word-p. 46
10.8  Master Node to eNB/gNB Change  Word-p. 48
10.8.1  EN-DC
10.8.2  MR-DC with 5GC  Word-p. 50
10.9  eNB/gNB to Master Node change  Word-p. 51
10.9.1  EN-DC
10.9.2  MR-DC with 5GC  Word-p. 52
10.10  RRC Transfer  Word-p. 53
10.10.1  EN-DC
10.10.2  MR-DC with 5GC  Word-p. 55
10.11  Secondary RAT data volume reporting  Word-p. 56
10.11.1  EN-DC
10.11.2  MR-DC with 5GC  Word-p. 57
10.12  Activity Notification
10.12.1  EN-DC
10.12.2  MR-DC with 5GC  Word-p. 58
10.13  Notification Control Indication  Word-p. 61
10.13.1  EN-DC
10.13.2  MR-DC with 5GC
10.14  PDU Session Split at UPF
10.14.1  PDU Session Split at UPF during PDU session resource setup
10.14.2  PDU Session Split at UPF during PDU session resource modify (5GC initiated)  Word-p. 62
10.14.3  PDU Session Split at UPF (RAN initiated QoS flows offloading from MN to SN)
11  Service related aspects  Word-p. 65
11.1  Roaming and Access Restrictions
11.2  Support of Network Sharing
11.3  ARPI/SPID Handling from MN [R16]  Up
12  X2/Xn Interface related aspects
13  Other aspects
13.1  Interference avoidance for in-device coexistence
A  Layer 2 handling for bearer type change  Word-p. 66
B  Supported MR-DC Handover Scenarios  Word-p. 68
C  Change history  Word-p. 69

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