Content for TS 38.331 Word version: 18.2.0

1… 4… 5… 5.2.2.4… 5.3… 5.3.3… 5.3.5… 5.3.5.5… 5.3.5.6… 5.3.5.7… 5.3.5.13… 5.3.5.17… 5.3.6… 5.3.8… 5.3.13… 5.3.14… 5.4… 5.5… 5.5.3… 5.5.4… 5.5.4.15… 5.5.4.23… 5.5.5… 5.5a… 5.7… 5.7.4… 5.7.8… 5.7.12… 5.8… 5.8.9… 5.8.9.2… 5.8.9.8… 5.8.10… 5.8.11… 5.9… 5.10… 6… 6.2.2… 6-2-2-23… 6-2-2-27… 6-2-2-43… 6-2-2-47… 6.3… 6.3.2… 6-3-2-27… 6-3-2-49… 6-3-2-73… 6-3-2-95… 6-3-2-108… 6-3-2-134… 6-3-2-162… 6-3-2-188… 6-3-2-213… 6-3-2-243… 6-3-2-271… 6-3-2-297… 6-3-2-341… 6.3.3… 6-3-3-25… 6-3-3-51… 6.3.4… 6.3.5… 6-3-5-25… 6.3.6… 6.4… 7… 9… 11… A… A.4… B…

3.1 Definitions 3.2 Abbreviations
...

1 Scope p. 28

The present document specifies the Radio Resource Control protocol for the radio interface between UE and NG-RAN.

The scope of the present document also includes:

the radio related information transported in a transparent container between source gNB and target gNB upon inter gNB handover;
the radio related information transported in a transparent container between a source or target gNB and another system upon inter RAT handover.
the radio related information transported in a transparent container between a source eNB and target gNB during E-UTRA-NR Dual Connectivity.

The RRC protocol is also used to configure the radio interface between an IAB-node and its parent node (TS 38.300), and the radio interface between an NCR-node and gNB (TS 38.300).

2 References p. 28

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 38.300: "NR; Overall description; Stage 2".

[3]

TS 38.321: "NR; Medium Access Control (MAC); Protocol specification".

[4]

TS 38.322: "NR; Radio Link Control (RLC) protocol specification".

[5]

TS 38.323: "NR; Packet Data Convergence Protocol (PDCP) protocol specification".

[6]

ITU-T Recommendation X.680 (08/2015) "Information Technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation" (Same as the ISO/IEC International Standard 8824-1).

[7]

ITU-T Recommendation X.681 (08/2015) "Information Technology - Abstract Syntax Notation One (ASN.1): Information object specification" (Same as the ISO/IEC International Standard 8824-2).

[8]

ITU-T Recommendation X.691 (08/2015) "Information technology - ASN.1 encoding rules: Specification of Packed Encoding Rules (PER)" (Same as the ISO/IEC International Standard 8825-2).

[9]

TS 38.215: "NR; Physical layer measurements".

[10]

TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA) Radio Resource Control (RRC); Protocol Specification".

[11]

TS 33.501: "Security Architecture and Procedures for 5G System".

[12]

TS 38.104: "NR; Base Station (BS) radio transmission and reception".

[13]

TS 38.213: "NR; Physical layer procedures for control".

[14]

TS 38.133: "NR; Requirements for support of radio resource management".

[15]

TS 38.101-1: "NR; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone".

[16]

TS 38.211: "NR; Physical channels and modulation".

[17]

TS 38.212: "NR; Multiplexing and channel coding".

[18]

ITU-T Recommendation X.683 (08/2015) "Information Technology - Abstract Syntax Notation One (ASN.1): Parameterization of ASN.1 specifications" (Same as the ISO/IEC International Standard 8824-4).

[19]

TS 38.214: "NR; Physical layer procedures for data".

[20]

TS 38.304: "NR; User Equipment (UE) procedures in Idle mode and RRC Inactive state".

[21]

TS 23.003: "Numbering, addressing and identification".

[22]

TS 36.101: "E-UTRA; User Equipment (UE) radio transmission and reception".

[23]

TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".

[24]

TS 37.324: "Service Data Adaptation Protocol (SDAP) specification".

[25]

TS 22.261: "Service requirements for the 5G System".

[26]

TS 38.306: "User Equipment (UE) radio access capabilities".

[27]

TS 36.304: "E-UTRA; User Equipment (UE) procedures in idle mode".

[28]

ATIS 0700041: "WEA 3.0: Device-Based Geo-Fencing".

[29]

TS 23.041: "Technical realization of Cell Broadcast Service (CBS)".

[30]

TS 33.401: "3GPP System Architecture Evolution (SAE); Security architecture".

[31]

TS 36.211: "E-UTRA; Physical channels and modulation".

[32]

TS 23.501: "System Architecture for the 5G System; Stage 2".

[33]

TS 36.104: "E-UTRA; Base Station (BS) radio transmission and reception".

[34]

TS 38.101-3: "NR; User Equipment (UE) radio transmission and reception; Part 3: Range 1 and Range 2 Interworking operation with other radios".

[35]

TS 38.423: "NG-RAN, Xn application protocol (XnAP)".

[36]

TS 38.473: "NG-RAN; F1 application protocol (F1AP)".

[37]

TS 36.423: "E-UTRA; X2 application protocol (X2AP)".

[38]

TS 24.008: "Mobile radio interface layer 3 specification; Core network protocols; Stage 3".

[39]

TS 38.101-2: "NR; User Equipment (UE) radio transmission and reception; Part 2: Range 2 Standalone".

[40]

TS 36.133: "E-UTRA; Requirements for support of radio resource management".

[41]

TS 37.340: "E-UTRA and NR; Multi-connectivity; Stage 2".

[42]

TS 38.413: "NG-RAN, NG Application Protocol (NGAP)".

[43]

TS 23.502: "Procedures for the 5G System; Stage 2".

[44]

TR 36.816: "Evolved Universal Terrestrial Radio Access (E-UTRA); Study on signalling and procedure for interference avoidance for in-device coexistence ".

[45]

TS 25.331: "Universal Terrestrial Radio Access (UTRA); Radio Resource Control (RRC); Protocol specification".

[46]

TS 25.133: "Requirements for Support of Radio Resource Management (FDD)".

[47]

TS 38.340: "Backhaul Adaptation Protocol (BAP) specification"

[48]

TS 37.213: "Physical layer procedures for shared spectrum channel access".

[49]

TS 37.355: "LTE Positioning Protocol (LPP)".

[50]

IEEE 802.11-2012, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, IEEE Std.

[51]

Bluetooth Special Interest Group: "Bluetooth Core Specification v5.0", December 2016.

[52]

TS 32.422: "Telecommunication management; Subscriber and equipment trace; Trace control and configuration management".

[53]

TS 38.314: "NR; layer 2 measurements".

[54] Void.

[55]

TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services".

[56]

TS 23.285: "Technical Specification Group Services and System Aspects; Architecture enhancements for V2X services".

[57]

TS 24.587: " Technical Specification Group Core Network and Terminals; Vehicle-to-Everything (V2X) services in 5G System (5GS)".

[58]

Military Standard WGS84 Metric MIL-STD-2401 (11 January 1994): "Military Standard Department of Defence World Geodetic System (WGS)".

[59]

TS 38.101-4: "NR; User Equipment (UE) radio transmission and reception; Part 4: Performance Requirements".

[60]

TS 33.536: "Technical Specification Group Services and System Aspects; Security aspects of 3GPP support for advanced Vehicle-to-Everything (V2X) services".

[61]

TS 37.320: "Radio measurement collection for Minimization of Drive Tests (MDT); Overall description; Stage 2".

[62]

TS 36.306: "User Equipment (UE) radio access capabilities".

[63]

TS 38.174: "NR; Integrated Access and Backhaul (IAB) radio transmission and reception".

[64]

TS 38.472: "NG-RAN; F1 signalling transport".

[65]

TS 23.304: "Proximity based Services (ProSe) in the 5G System (5GS)".

[66]

TS 38.351: "NR; Sidelink Relay Adaptation Protocol (SRAP) Specification".

[67]

TS 23.247: "Architectural enhancements for 5G multicast-broadcast services; Stage 2"

[68]

TS 26.247: "Transparent end-to-end Packet-switched Streaming Service (PSS); Progressive Download and Dynamic Adaptive Streaming over HTTP (3GP-DASH)".

[69]

TS 26.114: "IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and interaction".

[70]

TS 26.118: "Virtual Reality (VR) profiles for streaming applications".

[71]

NIMA TR 8350.2, Third Edition, Amendment 1, 3 January 2000: "DEPARTMENT OF DEFENSE WORLD GEODETIC SYSTEM 1984".

[72]

TS 24.554: "Technical Specification Group Core Network and Terminals; Proximity-services (ProSe) in 5G System (5GS) protocol".

[73]

TS 38.305: "NG Radio Access Network (NG-RAN); Stage 2 functional specification of User Equipment (UE) positioning in NG-RAN".

[74]

TS 23.122: "Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode".

[75]

TS 38.101-5: "User Equipment (UE) radio transmission and reception; Part 5: Satellite access Radio Frequency (RF) and performance requirements".

[76]

TS 23.256: "Support of Uncrewed Aerial Systems (UAS) connectivity, identification and tracking; Stage 2".

[77]

TS 38.355: "NR; Sidelink Positioning Protocol (SLPP); Protocol Specification".

[78]

TS 24.588: "Technical Specification Group Core Network and Terminals; Vehicle-to-Everything (V2X) services in 5G System (5GS); User Equipment (UE) policies; Stage 3".

[79]

TS 38.106: "NR; NR Repeater Radio Transmission and Reception".

3 Definitions, symbols and abbreviations p. 31

3.1 Definitions p. 31

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.

2Rx XR UE:

Two antenna port XR UE as specified in TS 38.101-1.

A2X communication:

A communication to support A2X services leveraging PC5 reference points, as defined in TS 23.256. A2X services are realized by various types of A2X applications, e.g., BRID or DAA.

Additional RLC bearer:

If the sidelink PDCP entity is associated with two sidelink RLC entities, the additional RLC bearer is the RLC bearer configured by sl-RLC-BearerToAddModListSizeExt in sl-ConfigDedicatedNR, or sl-RLC-BearerConfigListSizeExt in SIB12 or in SidelinkPreconfigNR.

Aerial UE:

UE performing Aerial UE communication, as defined in clause 16.18 of TS 38.300 and TS 23.256.

AM MRB:

An MRB associated with at least an AM RLC bearer for PTP transmission.

BH RLC channel:

An RLC channel between two nodes, which is used to transport backhaul packets.

Broadcast MRB:

A radio bearer configured for MBS broadcast delivery.

CEIL:

Mathematical function used to 'round up' i.e. to the nearest integer having a higher or equal value.

DAPS bearer:

a bearer whose radio protocols are located in both the source gNB and the target gNB during DAPS handover to use both source gNB and target gNB resources.

Data Burst:

A set of multiple PDUs generated and sent by the application in a short period of time, as defined in TS 23.501.

Dedicated signalling:

Signalling sent on DCCH logical channel between the network and a single UE.

Dormant BWP:

The dormant BWP is one of downlink BWPs configured by the network via dedicated RRC signalling. In the dormant BWP, the UE stops monitoring PDCCH on/for the SCell, but continues performing CSI measurements, Automatic Gain Control (AGC) and beam management, if configured. For each serving cell other than the SpCell or PUCCH SCell, the network may configure one BWP as a dormant BWP.

Earth-fixed cell:

An NTN cell fixed with respect to a certain geographic area on Earth. It can be provisioned by beam(s) continuously covering the same geographical area (e.g., the case of GSO satellites).

Earth-moving cell:

An NTN cell moving on the ground. It can be provisioned by beam(s) whose coverage area slides over the Earth's surface (e.g., the case of NGSO satellites generating fixed or non-steerable beams).

eRedCap UE:

A UE with enhanced reduced capabilities as specified in clause 4.2.22.1 of TS 38.306.

Field:

The individual contents of an information element are referred to as fields.

FLOOR:

Mathematical function used to 'round down' i.e. to the nearest integer having a lower or equal value.

Frequency Selection Area ID:

An identity used for broadcast MBS session to guide the frequency selection of the UE as defined in TS 23.247.

Global cell identity:

An identity to uniquely identifying an NR cell. It is consisted of cellIdentity and plmn-Identity of the first PLMN-Identity in plmn-IdentityList in SIB1.

Information element:

A structural element containing single or multiple fields is referred as information element.

Candidate configuration:

A configuration part of an RRCReconfiguration message associated with a candidate cell, e.g., for LTM or subsequent CPAC. A candidate configuration can be a complete candidate configuration or a delta configuration relatively to a reference configuration.

Reference configuration:

A configuration provided by the network to the UE that is common, within the same cell group, to a group of configured non-complete candidate configurations.

MBS Radio Bearer:

A radio bearer that is configured for MBS delivery.

Mobile IAB-MT:

mobile IAB-node function that terminates the Uu interface to the parent node using the procedures and behaviours specified for UEs unless stated otherwise. The mobile IAB-MT uses the same procedures and behaviours specified for the IAB-MT, unless explicitly stated otherwise.

Mobile IAB-node:

RAN node that supports NR access links to UEs and an NR backhaul link to a parent node, and that can conduct physical mobility across the RAN area. The mobile IAB-node function used in 38-series of 3GPP Specifications corresponds to the MBSR function defined in TS 23.501. The mobile IAB-node uses the same procedures and behaviours specified for the IAB-node, unless explicitly stated otherwise.

Multicast/Broadcast Service:

A point-to-multipoint service as defined in TS 23.247.

Multicast MRB:

A radio bearer configured for MBS multicast delivery.

MUSIM gap:

Period that the UE may use to perform MUSIM operations.

Multi-path:

Mode of operation of a UE in RRC_CONNECTED configured with one direct path on which the UE connects to gNB using NR Uu, and one indirect path on which the UE connects to the same gNB via another UE using PC5 unicast link or Non-3GPP Connection.

MP remote UE:

A UE configured with Multi-path. When the connectivity of indirect path is PC5 unicast link, the MP remote UE is acting as a L2 U2N Remote UE. When the connectivity of indirect path is Non-3GPP Connection, the MP remote UE is acting as a N3C remote UE.

MP relay UE:

A UE that provides connectivity of indirect path to a MP remote UE. When the connectivity is PC5 unicast link, the MP relay UE is acting as a L2 U2N Relay UE. When the connectivity is Non-3GPP Connection, the MP relay UE is acting as a N3C relay UE.

NCSG:

Network controlled small gap as defined in TS 38.133.

NPN-only Cell:

A cell that is only available for normal service for NPNs' subscriber. An NPN-capable UE determines that a cell is NPN-only Cell by detecting that the cellReservedForOtherUse IE is set to true while the npn-IdentityInfoList IE is present in CellAccessRelatedInfo.

N3C indirect path:

In Multi-path, the indirect path using Non-3GPP Connection between remote UE and relay UE.

NR sidelink communication:

AS functionality enabling at least V2X Communication as defined in TS 23.287 and/or A2X Communication as defined in TS 23.256 and/or ProSe Communication (including ProSe UE-to-Network Relay, non-Relay communication, and ProSe UE-to-UE Relay Communication including UE-to-UE Relay communication with integrated discovery) 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, ProSe UE-to-Network Relay discovery and ProSe UE-to-UE 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.

NR sidelink positioning:

AS functionality which determines geographical or relative location and possibly velocity of a target UE or ranging via PC5 interface using SL-PRS transmission and reception as defined in TS 38.305 and TS 38.355.

PNI-NPN identity:

an identifier of a PNI-NPN comprising of a PLMN ID and a CAG-ID combination.

Primary Cell:

The MCG cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure.

PC5 Relay RLC channel:

An RLC channel between L2 U2N Remote UE and L2 U2N Relay UE, or between L2 U2U Remote UE and L2 U2U Relay UE, which is used to transport packets over PC5 for L2 UE-to-Network relay or L2 UE-to-UE relay.

PDU Set:

one or more PDUs carrying the payload of one unit of information generated at the application level (e.g. frame(s) or video slice(s) for XR Services), as defined in TS 23.501.

Primary SCG Cell:

For dual connectivity operation, the SCG cell in which the UE performs random access when performing the Reconfiguration with Sync procedure.

Primary Timing Advance Group:

Timing Advance Group containing the SpCell.

PUCCH SCell:

An SCell configured with PUCCH by PUCCH-Config.

PUSCH-Less SCell:

An SCell configured without PUSCH.

Quasi-Earth-fixed cell:

An NTN cell fixed with respect to a certain geographic area on Earth during a certain time duration. It can be provisioned by beam(s) covering one geographic area for a limited period and a different geographic area during another period (e.g., the case of NGSO satellites generating steerable beams).

RedCap UE:

A UE with reduced capabilities as specified in clause 4.2.21.1 in TS 38.306.

RLC bearer configuration:

The lower layer part of the radio bearer configuration comprising the RLC and logical channel configurations.

Secondary Cell:

For a UE configured with CA, a cell providing additional radio resources on top of Special Cell.

Secondary Cell Group:

For a UE configured with dual connectivity, the subset of serving cells comprising of the PSCell and zero or more secondary cells.

Serving Cell:

For a UE in RRC_CONNECTED not configured with CA/DC there is only one serving cell comprising of the primary cell. For a UE in RRC_CONNECTED configured with CA/ DC the term 'serving cells' is used to denote the set of cells comprising of the Special Cell(s) and all secondary cells.

Small Data Transmission:

A procedure used for transmission of data and/or signalling over allowed radio bearers in RRC_INACTIVE state (i.e. without the UE transitioning to RRC_CONNECTED state). The SDT procedure is considered to be ongoing once the conditions for initating SDT as specified in clause 5.3.13.1b are fulfilled until the SDT procedure is completed either successfully or unsuccessfully as specified in clause 18.0 in TS 38.300.

SNPN identity:

an identifier of an SNPN comprising of a PLMN ID and an NID combination.

SL indirect path:

In Multi-path, the indirect path using PC5 unicast link between remote UE and relay UE.

Special Cell:

For Dual Connectivity operation the term Special Cell refers to the PCell of the MCG or the PSCell of the SCG, otherwise the term Special Cell refers to the PCell.

Split DRB:

In MR-DC, a DRB that supports transmission via MCG and SCG, as well as duplication of PDCP PDUs as defined in TS 37.340; or in MP, a DRB that supports transmission via direct path and indirect path, as well as duplication of PDCP PDUs.

Split SRB:

In MR-DC, an SRB that supports transmission via MCG and SCG as well as duplication of RRC PDUs as defined in TS 37.340; or in MP, a SRB that supports transmission via direct path and indirect path, as well as duplication of PDCP PDUs.

SSB Frequency:

Frequency referring to the position of resource element RE=#0 (subcarrier #0) of resource block RB#10 of the SS block.

U2N Relay UE:

A UE that provides functionality to support connectivity to the network for U2N Remote UE(s).

U2N Remote UE:

A UE that communicates with the network via a U2N Relay UE.

U2U Relay UE:

A UE that provides functionality to support connectivity between two U2U Remote UEs.

U2U Remote UE:

A UE that communicates with other UEs via a U2U Relay UE.

Uu Relay RLC channel:

An RLC channel between L2 U2N Relay UE and gNB, which is used to transport packets over Uu for L2 UE-to-Network relay or for indirect path in case of MP.

UE Inactive AS Context:

UE Inactive AS Context is stored when the connection is suspended and restored when the connection is resumed. It includes information as defined in clause 5.3.8.3.

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.

3.2 Abbreviations p. 34

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.

5GC

5G Core Network

A2X

Aircraft-to-Everything

ACK

Acknowledgement

Acknowledged Mode

ARQ

Automatic Repeat Request

Access Stratum

ASN.1

Abstract Syntax Notation One

ATG

Air to Ground

BAP

Backhaul Adaptation Protocol

BCD

Binary Coded Decimal

BFD

Beam Failure Detection

Backhaul

BLER

Block Error Rate

BRID

Broadcast Remote Identification

BSR

Buffer Status Report

BWP

Bandwidth Part

Carrier Aggregation

CAG

Closed Access Group

CAG-ID

Closed Access Group Identifier

CAPC

Channel Access Priority Class

CBR

Channel Busy Ratio

CCCH

Common Control Channel

CFR

Common Frequency Resources

Cell Group

CHO

Conditional Handover

CLI

Cross Link Interference

CMAS

Commercial Mobile Alert Service

Control Plane

CPA

Conditional PSCell Addition

CPAC

Conditional PSCell Addition or Change

CPC

Conditional PSCell Change

C-RNTI

Cell RNTI

CSI

Channel State Information

DAA

Detect And Avoid

DAPS

Dual Active Protocol Stack

Dual Connectivity

DCCH

Dedicated Control Channel

DCI

Downlink Control Information

DCP

DCI with CRC scrambled by PS-RNTI

DFN

Direct Frame Number

Downlink

DL-PRS

Downlink Positioning Reference Signal

DL-SCH

Downlink Shared Channel

DM-RS

Demodulation Reference Signal

DRB

(user) Data Radio Bearer

DRX

Discontinuous Reception

DSR

Delay Status Report

DTCH

Dedicated Traffic Channel

DTX

Discontinuous Transmission

ECEF

Earth-Centered, Earth-Fixed

ECI

Earth-Centered Inertial

EN-DC

E-UTRA NR Dual Connectivity with E-UTRA connected to EPC

EPC

Evolved Packet Core

EPS

Evolved Packet System

ETWS

Earthquake and Tsunami Warning System

E-UTRA

Evolved Universal Terrestrial Radio Access

E-UTRA/5GC

E-UTRA connected to 5GC

E-UTRA/EPC

E-UTRA connected to EPC

E-UTRAN

Evolved Universal Terrestrial Radio Access Network

FDD

Frequency Division Duplex

FFS

For Further Study

G-CS-RNTI

Group Configured Scheduling RNTI

GERAN

GSM/EDGE Radio Access Network

GIN

Group ID for Network selection

GNSS

Global Navigation Satellite System

G-RNTI

Group RNTI

GSM

Global System for Mobile Communications

GSO

Geosynchronous Orbit

HARQ

Hybrid Automatic Repeat Request

HRNN

Human Readable Network Name

HSDN

High Speed Dedicated Network

H-SFN

Hyper SFN

HST

High Speed Train

IAB

Integrated Access and Backhaul

IAB-DU

IAB-node DU

IAB-MT

IAB Mobile Termination

IDC

In-Device Coexistence

Information element

IMSI

International Mobile Subscriber Identity

Kilobyte (1000 bytes)

Layer 1

Layer 2

Layer 3

LBT

Listen Before Talk

LEO

Low Earth Orbit

LTM

L1/L2 Triggered Mobility

MAC

Medium Access Control

MBS

Multicast/Broadcast Service

MBS FSAI

MBS Frequency Selection Area Identity

MCCH

MBS Control Channel

MCG

Master Cell Group

MDT

Minimization of Drive Tests

MIB

Master Information Block

MO-SDT

Mobile Originated SDT

MPE

Maximum Permissible Exposure

Multi-path

MRB

MBS Radio Bearer

MR-DC

Multi-Radio Dual Connectivity

MTCH

MBS Traffic Channel

MT-SDT

Mobile Terminated SDT

MTSI

Multimedia Telephony Service for IMS

MUSIM

Multi-Universal Subscriber Identity Module

N3C

Non-3GPP Connection

N/A

Not Applicable

NCR

Network-Controlled Repeater

NCR-Fwd

NCR Forwarding

NCR-MT

NCR Mobile Termination

NE-DC

NR E-UTRA Dual Connectivity

NES

Network Energy Savings

(NG)EN-DC

E-UTRA NR Dual Connectivity (covering E-UTRA connected to EPC or 5GC)

NGEN-DC

E-UTRA NR Dual Connectivity with E-UTRA connected to 5GC

NID

Network Identifier

NPN

Non-Public Network

NR-DC

NR-NR Dual Connectivity

NR/5GC

NR connected to 5GC

NSAG

Network Slice AS Group

NTN

Non-Terrestrial Network

PCell

Primary Cell

PDCP

Packet Data Convergence Protocol

PDU

Protocol Data Unit

PEI

Paging Early Indication

PEI-O

Paging Early Indication-Occasion

PLMN

Public Land Mobile Network

PNI-NPN

Public Network Integrated Non-Public Network

posSIB

Positioning SIB

PPW

PRS Processing Window

PRS

Positioning Reference Signal

PSCell

Primary SCG Cell

PSI

PDU Set Importance

PTM

Point to Multipoint

PTP

Point to Point

PWS

Public Warning System

QoE

Quality of Experience

QoS

Quality of Service

RAN

Radio Access Network

RAT

Radio Access Technology

RLC

Radio Link Control

RLM

Radio Link Monitoring

RMTC

RSSI Measurement Timing Configuration

RNA

RAN-based Notification Area

RNTI

Radio Network Temporary Identifier

ROHC

Robust Header Compression

RPLMN

Registered Public Land Mobile Network

RRC

Radio Resource Control

Reference Signal

SBAS

Satellite Based Augmentation System

SCell

Secondary Cell

SCG

Secondary Cell Group

SCS

Subcarrier Spacing

SD-RSRP

Sidelink Discovery RSRP

SDT

Small Data Transmission

SFN

Single Frequency Network

SFN

System Frame Number

SFTD

SFN and Frame Timing Difference

System Information

SIB

System Information Block

Sidelink

SL-PRS

Sidelink Positioning Reference Signal

SLSS

Sidelink Synchronisation Signal

SNPN

Stand-alone Non-Public Network

SpCell

Special Cell

SRAP

Sidelink Relay Adaptation Protocol

SRB

Signalling Radio Bearer

SRS

Sounding Reference Signal

SSB

Synchronization Signal Block

TAG

Timing Advance Group

TDCP

Time Domain Channel Property

TDD

Time Division Duplex

TEG

Timing Error Group

Transparent Mode

TMGI

Temporary Mobile Group Identity

Terrestrial Network

TSS

Timing Synchronization Status.

U2N

UE-to-Network

U2U

UE-to-UE

UDC

Uplink Data Compression

User Equipment

Uplink

Unacknowledged Mode

User Plane

Virtual Reality

VSAT

Very Small Aperture Terminal

eXtended Reality

In the ASN.1, lower case may be used for some (parts) of the above abbreviations e.g. c-RNTI.