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Content for  TS 37.340  Word version:  18.1.0

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1  Scopep. 7

The present document provides an overview of the multi-connectivity operation using E-UTRA and NR radio access technologies. Details of the network and radio interface protocols are specified in companion specifications of the 36 and 38 series.

2  Referencesp. 7

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2".
[3]
TS 38.300: "NR; NR and NG-RAN Overall description; Stage 2".
[4]
TS 38.331: "NR; Radio Resource Control (RRC) protocol specification".
[5]
TS 38.423: "NG-RAN; Xn application protocol (XnAP)".
[6]
TS 38.425: "NG-RAN; NR user plane protocol".
[7]
TS 38.401: "NG-RAN; Architecture description".
[8]
TS 38.133: "NG-RAN; Requirements for support of radio resource management".
[9]
TS 36.423: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 Application Protocol (X2AP)".
[10]
TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification".
[11]
TS 23.501: "System Architecture for the 5G System; Stage 2".
[12]
TS 38.101-1: "User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone".
[13]
TS 38.101-2: "User Equipment (UE) radio transmission and reception; Part 2: Range 2 Standalone".
[14]
TS 38.101-3: "User Equipment (UE) radio transmission and reception; Part 3: Range 1 and Range 2 Interworking operation with other radios".
[15]
TS 36.323: "Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data Convergence Protocol (PDCP) specification".
[16]
TS 38.323: "NR; Packet Data Convergence Protocol (PDCP) specification".
[17]
TS 38.340: "Backhaul Adaptation Protocol (BAP) specification".
[18]
TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services ".
[19]
TS 23.285: "Architecture enhancements for V2X services".
[20]
TS 23.502: "Procedures for the 5G System; Stage 2".
[21]
TS 38.213: "NR; Physical layer procedures".
[22]
TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3".
[23]
TS 38.473: "F1 application protocol (F1AP)".
[24]
TS 23.304: "Proximity based Services (ProSe) in the 5G System (5GS)".
[25]
TS 23.586: "Technical Specification Group Services and System Aspects; Architectural Enhancements to support Ranging based services and Sidelink Positioning".
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3  Definitions, symbols and abbreviationsp. 8

3.1  Definitionsp. 8

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 and TS 36.300.
Child node:
IAB-DU's or IAB-donor-DU's next hop neighbour IAB-node.
Conditional PSCell Addition:
a PSCell addition procedure that is executed only when PSCell addition execution condition is met.
Conditional PSCell Change:
a PSCell change procedure that is executed only when PSCell change execution condition is met.
En-gNB:
node providing NR user plane and control plane protocol terminations towards the UE, and acting as Secondary Node in EN-DC.
Fast MCG link recovery:
in MR-DC, an RRC procedure where the UE sends an MCG Failure Information message to the MN via the SCG upon the detection of a radio link failure on the MCG.
IAB-donor:
gNB that provides network access to UEs via a network of backhaul and access links.
IAB-MT:
IAB-node function that terminates the Uu interface to the parent node using the procedures and behaviours specified for UEs unless stated otherwise.
IAB-node:
RAN node that supports NR access links to UEs and NR backhaul links to parent nodes and child nodes. The IAB-node does not support backhauling via E-UTRA.
Master Cell Group:
in MR-DC, a group of serving cells associated with the Master Node, comprising of the SpCell (PCell) and optionally one or more SCells.
Master node:
in MR-DC, the radio access node that provides the control plane connection to the core network. It may be a Master eNB (in EN-DC), a Master ng-eNB (in NGEN-DC) or a Master gNB (in NR-DC and NE-DC).
MCG bearer:
in MR-DC, a radio bearer with an RLC bearer (or two RLC bearers, in case of CA packet duplication in an E-UTRAN cell group, or up to four RLC bearers in case of CA packet duplication in a NR cell group) only in the MCG.
MN terminated bearer:
in MR-DC, a radio bearer for which PDCP is located in the MN.
MCG SRB:
in MR-DC, a direct SRB between the MN and the UE.
Multi-Radio Dual Connectivity:
Dual Connectivity between E-UTRA and NR nodes, or between two NR nodes.
Ng-eNB:
as defined in TS 38.300.
NR sidelink communication:
AS functionality enabling at least V2X Communication as defined in TS 23.287 and ProSe Communication (including ProSe UE-to-Network Relay and non-Relay communication) as defined in TS 23.304, between two or more nearby UEs, using NR technology but not traversing any network node.
NR sidelink discovery:
AS functionality enabling ProSe non-Relay Discovery and ProSe UE-to-Network Relay discovery for Proximity based Services as defined in TS 23.304 between two or more nearby UEs, using NR technology but not traversing any network node.
Parent node:
IAB-MT's next hop neighbour node; the parent node can be IAB-node or IAB-donor-DU.
PCell:
SpCell of a master cell group.
PSCell:
SpCell of a secondary cell group.
Ranging/Sidelink Positioning:
AS functionality enabling ranging-based services and sidelink positioning as defined in TS 23.586.
RLC bearer:
RLC and MAC logical channel configuration of a radio bearer in one cell group.
Secondary Cell Group:
in MR-DC, a group of serving cells associated with the Secondary Node, comprising of the SpCell (PSCell) and optionally one or more SCells.
Secondary node:
in MR-DC, the radio access node, with no control plane connection to the core network, providing additional resources to the UE. It may be an en-gNB (in EN-DC), a Secondary ng-eNB (in NE-DC) or a Secondary gNB (in NR-DC and NGEN-DC).
SCG bearer:
in MR-DC, a radio bearer with an RLC bearer (or two RLC bearers, in case of CA packet duplication in an E-UTRAN cell group, or up to four RLC bearers in case of CA packet duplication in a NR cell group) only in the SCG.
SN terminated bearer:
in MR-DC, a radio bearer for which PDCP is located in the SN.
SpCell:
primary cell of a master or secondary cell group.
SRB3:
in EN-DC, NGEN-DC and NR-DC, a direct SRB between the SN and the UE.
SRB5:
in NR-DC, a direct SRB between the SN and the UE dedicated for sending application layer measurement report information.
Split bearer:
in MR-DC, a radio bearer with RLC bearers both in MCG and SCG.
Split PDU Session (or PDU Session split):
a PDU Session whose QoS Flows are served by more than one SDAP entities in the NG-RAN.
Split SRB:
in MR-DC, a SRB between the MN and the UE with RLC bearers both in MCG and SCG.
Subsequent Conditional PSCell Addition or Change (subsequent CPAC):
a conditional PSCell addition or change procedure that is executed after a PSCell addition, a PSCell change, a PCell change or an SCG release based on pre-configured subsequent CPAC configuration of candidate PSCell(s) without reconfiguration and re-initiation of CPC/CPA.
User plane resource configuration:
in MR-DC with 5GC, encompasses radio network resources and radio access resources related to either one or more PDU sessions, one or more QoS flows, one or more DRBs, or any combination thereof.
V2X sidelink communication:
AS functionality enabling V2X Communication as defined in TS 23.285, between nearby UEs, using E-UTRA technology but not traversing any network node.
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3.2  Abbreviationsp. 9

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905, TS 36.300 and TS 38.300.
BFD
Beam Failure Detection
CHO
Conditional Handover
CLI
Cross Link Interference
CPA
Conditional PSCell Addition
CPAC
Conditional PSCell Addition or Change
CPC
Conditional PSCell Change
DAPS
Dual Active Protocol Stack
DC
Intra-E-UTRA Dual Connectivity
DCP
DCI with CRC scrambled by PS-RNTI
EN-DC
E-UTRA-NR Dual Connectivity
IAB
Integrated Access and Backhaul
IDC
In-Device Coexistence
LTM
L1/L2 Triggered Mobility
MCG
Master Cell Group
MN
Master Node
MR-DC
Multi-Radio Dual Connectivity
MUSIM
Multi-Universal Subscriber Identity Module
NE-DC
NR-E-UTRA Dual Connectivity
NGEN-DC
NG-RAN E-UTRA-NR Dual Connectivity
NR-DC
NR-NR Dual Connectivity
QMC
QoE Measurement Collection
QoE
Quality of Experience
RLM
Radio Link Monitoring
SCG
Secondary Cell Group
SMTC
SS/PBCH block Measurement Timing Configuration
SN
Secondary Node
SPR
Successful PSCell Addition/Change Report
V2X
Vehicle-to-Everything
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