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
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.
A radio bearer configured for MBS broadcast delivery.
Mathematical function used to 'round up' i.e. to the nearest integer having a higher or equal value.
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.
Signalling sent on DCCH logical channel between the network and a single UE.
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.
The individual contents of an information element are referred to as fields.
Mathematical function used to 'round down' i.e. to the nearest integer having a lower or equal value.
Frequency Selection Area ID:
Global cell identity:
An identity used for broadcast MBS session to guide the frequency selection of the UE as defined in TS 23.247
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.
A structural element containing single or multiple fields is referred as information element.
MBS Radio Bearer:
A radio bearer that is configured for MBS delivery.
A point-to-multipoint service as defined in TS 23.247
A radio bearer configured for MBS multicast delivery.
Period that the UE may use to perform MUSIM operations.
Network controlled small gap as defined in TS 38.133
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.
NR sidelink communication:
NR sidelink discovery:
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.
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.
an identifier of a PNI-NPN comprising of a PLMN ID and a CAG -ID combination.
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, which is used to transport packets over PC5 for L2 UE-to-Network relay.
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.
An SCell configured with PUCCH by PUCCH-Config.
An SCell configured without PUSCH.
RLC bearer configuration:
The lower layer part of the radio bearer configuration comprising the RLC and logical channel configurations.
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.
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).
an identifier of an SNPN comprising of a PLMN ID and an NID combination.
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.
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
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.
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.
UE Inactive AS Context:
V2X sidelink communication:
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 188.8.131.52
AS functionality enabling V2X Communication as defined in TS 23.285
, between nearby UEs, using E-UTRA technology but not traversing any network node.
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
5G Core Network
Automatic Repeat Request
Abstract Syntax Notation One
Backhaul Adaptation Protocol
Binary Coded Decimal
Beam Failure Detection
Block Error Rate
Closed Access Group
Closed Access Group Identifier
Channel Access Priority Class
Channel Busy Ratio
Common Control Channel
Common Frequency Resources
Cross Link Interference
Commercial Mobile Alert Service
Conditional PSCell Addition
Conditional PSCell Change
Channel State Information
Dual Active Protocol Stack
Dedicated Control Channel
Downlink Control Information
DCI with CRC scrambled by PS-RNTI
Direct Frame Number
Downlink Positioning Reference Signal
Downlink Shared Channel
Demodulation Reference Signal
(user) Data Radio Bearer
Dedicated Traffic Channel
E-UTRA NR Dual Connectivity with E-UTRA connected to EPC
Evolved Packet Core
Evolved Packet System
Earthquake and Tsunami Warning System
Evolved Universal Terrestrial Radio Access
E-UTRA connected to 5GC
E-UTRA connected to EPC
Evolved Universal Terrestrial Radio Access Network
Frequency Division Duplex
For Further Study
Group Configured Scheduling RNTI
GSM/EDGE Radio Access Network
Group ID for Network selection
Global Navigation Satellite System
Global System for Mobile Communications
Hybrid Automatic Repeat Request
Human Readable Network Name
High Speed Dedicated Network
Integrated Access and Backhaul
IAB Mobile Termination
International Mobile Subscriber Identity
Kilobyte (1000 bytes)
Listen Before Talk
Low Earth Orbit
Medium Access Control
MBS Frequency Selection Area Identity
MBS Control Channel
Master Cell Group
Minimization of Drive Tests
Master Information Block
Maximum Permissible Exposure
MBS Radio Bearer
Multi-Radio Dual Connectivity
MBS Traffic Channel
Multimedia Telephony Service for IMS
Multi-Universal Subscriber Identity Module
NR E-UTRA Dual Connectivity
E-UTRA NR Dual Connectivity (covering E-UTRA connected to EPC or 5GC)
E-UTRA NR Dual Connectivity with E-UTRA connected to 5GC
NR-NR Dual Connectivity
NR connected to 5GC
Network Slice AS Group
Packet Data Convergence Protocol
Protocol Data Unit
Paging Early Indication
Paging Early Indication-Occasion
Public Land Mobile Network
Public Network Integrated Non-Public Network
PRS Processing Window
Positioning Reference Signal
Primary SCG Cell
Point to Multipoint
Point to Point
Public Warning System
Quality of Experience
Quality of Service
Radio Access Network
Radio Access Technology
Radio Link Control
Radio Link Monitoring
RSSI Measurement Timing Configuration
RAN-based Notification Area
Radio Network Temporary Identifier
Robust Header Compression
Registered Public Land Mobile Network
Radio Resource Control
Satellite Based Augmentation System
Secondary Cell Group
Sidelink Discovery RSRP
Small Data Transmission
System Frame Number
SFN and Frame Timing Difference
System Information Block
Sidelink Synchronisation Signal
Stand-alone Non-Public Network
Signalling Radio Bearer
Sidelink Relay Adaptation Protocol
Sounding Reference Signal
Synchronization Signal Block
Timing Advance Group
Time Division Duplex
Timing Error Group
Temporary Mobile Group Identity
Uplink Data Compression
In the ASN.1, lower case may be used for some (parts) of the above abbreviations e.g. c-RNTI.