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
In NB-IoT, a carrier where the UE assumes that NPSS/NSSS/NPBCH/SIB-NB for FDD or NPSS/NSSS/NPBCH for TDD are transmitted.
Refers to operation in downlink and uplink with a limited channel bandwidth of 6 PRBs.
Mathematical function used to 'round up' i.e. to the nearest integer having a higher or equal value.
Cellular IoT EPS Optimisation:
Commercial Mobile Alert System:
Provides improved support of small data transfer, as defined in TS 24.301
Public Warning System that delivers Warning Notifications provided by Warning Notification Providers to CMAS capable UEs.
Common access barring parameters:
The common access barring parameters refer to the access class barring parameters that are broadcast in SystemInformationBlockType2 outside the list of PLMN specific parameters (i.e. in ac-BarringPerPLMN-List).
Control plane CIoT 5GS optimisation:
Control plane CIoT EPS optimisation:
Enables support of efficient transport of user data (IP, Ethernet or unstructured) or SMS messages over control plane via the AMF without triggering data radio bearer establishment, as defined in TS 24.501
Control plane EDT:
Enables support of efficient transport of user data (IP, non-IP or SMS) over control plane via the MME without triggering data radio bearer establishment, as defined in TS 24.301
Early Data Transmission used with the Control plane CIoT EPS optimisation or Control plane CIoT 5GS optimisation.
CSG member cell:
In NB-IoT allows UE to use paging carriers configured for lower levels of coverage enhancement than maximum coverage enhancement supported in the cell as described in TS 36.300
A cell broadcasting the identity of the selected PLMN, registered PLMN or equivalent PLMN and for which the Permitted CSG list of the UE includes an entry comprising cell's CSG ID and the respective PLMN identity.
A bearer whose radio protocols are located in both the source eNB and the target eNB during a DAPS handover to use both source eNB and target eNB resources.
A UE in RRC_CONNECTED is configured with Dual Connectivity when configured with a Master and a Secondary Cell Group.
Early Data Transmission:
Early Security Reactivation:
Allows one uplink data transmission optionally followed by one downlink data transmission during the random access procedure as specified in TS 36.300
. The S1 connection is established or resumed upon reception of the uplink data and may be released or suspended along with the transmission of the downlink data. Early data transmission refers to both CP-EDT and UP-EDT.
Re-activation of AS security prior to the transmission of RRCConnectionResumeRequest message when a UE is provided with an NCC value during suspension.
A set of parameters that describe the movement of an NTN node over time.
E-UTRA-NR Dual Connectivity:
A form of dual connectivity in which a UE in RRC_CONNECTED is configured with MCG cells using E-UTRA and SCG cells using NR as defined in TS 37.340
Public Warning System that delivers Warning Notifications provided by Warning Notification Providers using the same AS mechanisms as defined for CMAS.
The individual contents of an information element are referred as fields.
Mathematical function used to 'round down' i.e. to the nearest integer having a lower or equal value.
Earth-centred orbit at approximately 35,786 kilometres in altitude above Earth's surface and synchronised with Earth's rotation. A geostationary orbit is a non-inclined geosynchronous orbit, i.e. in the Earth's equator plane.
A structural element containing a single or multiple fields is referred as information element.
Korean Public Alert System (KPAS):
Public Warning System that delivers Warning Notifications provided by Warning Notification Providers using the same AS mechanisms as defined for CMAS.
Master Cell Group:
For a UE not configured with DC, the MCG comprises all serving cells. For a UE configured with DC, the MCG concerns a subset of the serving cells comprising of the PCell and zero or more secondary cells.
Mixed Operation Mode:
In NB-IoT FDD, multi-carrier operation where the anchor carrier is in standalone mode while the non-anchor carrier is in inband or guardand mode, and vice versa. See TS 36.300
MBMS bearer service as defined in TS 23.246
(i.e. provided via an MRB or an SC-MRB).
NB-IoT allows access to network services via E-UTRA with a channel bandwidth limited to 200 kHz.
A UE that uses NB-IoT.
Network controlled small gap as defined in TS 36.133
Earth-centred orbit with an orbital period that does not match Earth's rotation on its axis. This includes Low Earth Orbit (LEO) and Medium Earth Orbit (MEO).
An E-UTRAN consisting of eNBs, which provide non-terrestrial LTE access to UEs by means of an NTN payload embarked on a space-borne NTN vehicle and an NTN Gateway.
NR-E-UTRA Dual Connectivity (NE-DC):
A form of dual connectivity in which a UE in RRC_CONNECTED is configured with MCG cells using NR and SCG cells using E-UTRA as defined in TS 37.340
In NB-IoT, a carrier where the UE does not assume that NPSS/NSSS/NPBCH/SIB-NB for FDD or NPSS/NSSS/NPBCH for TDD are transmitted.
NR Carrier Frequency:
Frequency referring to the position of resource element RE=#0 (subcarrier #0) of resource block RB#10 of the SS block.
NR sidelink communication:
AS functionality enabling at least V2X Communication as defined in TS 23.287
, between two or more nearby UEs, using NR technology but not traversing any network node.
The cell, operating on the primary frequency, in which the UE either performs the initial connection establishment procedure or initiates the connection re-establishment procedure, or the cell indicated as the primary cell in the handover procedure.
Primary Secondary Cell:
The SCG cell in which the UE is instructed to perform random access or initial PUSCH transmission if random access procedure is skipped when performing the SCG change procedure.
Primary Timing Advance Group:
Timing Advance Group containing the PCell or the PSCell.
An SCell configured with PUCCH.
Quasi-earth fixed cell:
An NTN cell fixed with respect to a certain geographic area on the earth during a certain time duration. This can be provided by beam(s) covering one geographic area for a finite period and a different geographic area during another period (e.g., the case of NGSO satellites generating steerable beams).
RLC bearer configuration:
The lower layer part of the radio bearer configuration comprising the RLC and logical channel configurations.
A space-borne vehicle orbiting the Earth that carries the NTN payload.
A cell, operating on a secondary frequency, which may be configured once an RRC connection is established and which may be used to provide additional radio resources. Except for the case of (NG)EN-DC, the PSCell is considered to be an SCell.
Secondary Cell Group:
For a UE configured with DC, the subset of serving cells not part of the MCG, i.e. comprising of the PSCell and zero or more other secondary cells.
Secondary Timing Advance Group:
Timing Advance Group neither containing the PCell nor the PSCell. A secondary timing advance group contains at least one cell with configured uplink.
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 one or more cells comprising of the primary cell and all secondary cells.
UE to UE interface for sidelink communication, V2X sidelink communication and sidelink discovery. The sidelink corresponds to the PC5 interface as defined in TS 23.303
AS functionality enabling ProSe Direct Communication as defined in TS 23.303
, between two or more nearby UEs, using E-UTRA technology but not traversing any network node. In this version, the terminology "sidelink communication" without "V2X" prefix only concerns PS unless specifically stated otherwise.
AS functionality enabling ProSe Direct Discovery as defined in TS 23.303
, using E-UTRA technology but not traversing any network node.
Includes sidelink communication, V2X sidelink communication and sidelink discovery.
Timing Advance Group:
in MR-DC, an SRB between the MN and the UE, allowing selection of either the direct path or the path via the SN as well as duplication of RRC PDUs across both paths as defined in TS 37.340
A group of serving cells that is configured by RRC and that, for the cells with an UL configured, use the same timing reference cell and the same Timing Advance value. A Timing Advance Group only includes cells of the same cell group i.e. it either includes MCG cells or SCG cells.
Transmission using PUR:
UE Inactive AS Context:
Allows one uplink data transmission using preconfigured uplink resource from RRC_IDLE mode as specified in TS 36.300
. Transmission using PUR refers to both CP transmission using PUR and UP transmission using PUR.
UE in CE:
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 220.127.116.11
Refers to a UE that is capable of using coverage enhancement, and requires coverage enhancement mode to access a cell or is configured in a coverage enhancement mode.
User plane CIoT 5GS optimisation:
User plane CIoT EPS optimisation:
Enables support for change from 5GMM-IDLE mode to 5GMM-CONNECTED mode without the need for using the Service Request procedure, as defined in TS 24.501
User plane EDT:
Enables support for change from EMM-IDLE mode to EMM-CONNECTED mode without the need for using the Service Request procedure, as defined in TS 24.301
Early Data Transmission used with the User plane CIoT EPS optimisation or User plane CIoT 5GS optimisation.
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.
For the purposes of the present document, the abbreviations given in TR 21.905
, TS 36.300
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
or TS 36.300
CDMA2000 1x Radio Transmission Technology
Application specific Congestion control for Data Communication
Assistance Information bit for Local Cache
Access Network Discovery and Selection Function
Automatic Repeat Request
Abstract Syntax Notation One
Broadcast Control Channel
Binary Coded Decimal
Bandwidth reduced Low complexity
Block Error Rate
Bandwidth Reduced Broadcast Control Channel
Cell Acquisition Subframes
Channel Busy Ratio
Common Control Channel
Cell Change Order
Control Format Indicator
Commercial Mobile Alert Service
Conditional PSCell Addition
Conditional PSCell Change
Control Plane EDT
Cell-specific Reference Signal
Closed Subscriber Group
Channel State Information
Dual Active Protocol Stack
Dedicated Control Channel
Downlink Control Information
Dedicated Core Networks
Direct Frame Number
Downlink Shared Channel
(user) Data Radio Bearer
Dedicated Traffic Channel
Extended Access Barring
Early Data Transmission
Equivalent Home Public Land Mobile Network
Enhanced Interference Management and Traffic Adaptation
Evolved Node B
E-UTRA NR Dual Connectivity with E-UTRAN connected to EPC
Evolved Packet Core
Enhanced Physical Downlink Control Channel
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
GSM/EDGE Radio Access Network
Global Navigation Satellite System
Global System for Mobile Communications
Group Wake Up Signal
Hybrid Automatic Repeat Request
Hyper Frame Number
Home Public Land Mobile Network
CDMA2000 High Rate Packet Data
High Speed Dedicated Network
Integrated Access and Backhaul
IAB Mobile Termination
International Mobile Equipment Identity
International Mobile Subscriber Identity
Internet of Things
Industrial, Scientific and Medical
Kilobyte (1000 bytes)
LTE-WLAN Aggregation Adaptation Protocol
LTE-WLAN Radio Level Integration with IPsec Tunnel
Medium Access Control
Multimedia Broadcast Multicast Service
Multimedia Broadcast multicast service Single Frequency Network
Master Cell Group
Maximum Channel Occupancy Time
Mission Critical Push To Talk
Minimization of Drive Tests
Master Information Block
MTC Physical Downlink Control Channel
MBMS Point to Multipoint Radio Bearer
Multi-Radio Dual Connectivity
Mobility Robustness Optimisation
MCH Scheduling Information
Multimedia Telephony Service for IMS
Multi-Universal Subscriber Identity Module
MultiUser Superposition Transmission
Network Assisted Cell Change
Network Assisted Interference Cancellation/Suppression
Non Access Stratum
NarrowBand Internet of Things
NR E-UTRA Dual Connectivity
E-UTRA NR Dual Connectivity (i.e. covering both EN-DC and NGEN-DC)
E-UTRA NR Dual Connectivity with E-UTRAN connected to 5GC
Narrowband Physical Broadcast channel
Narrowband Physical Downlink Control channel
Narrowband Physical Downlink Shared channel
Narrowband Physical Random Access channel
Narrowband Primary Synchronization Signal
Narrowband Physical Uplink Shared channel
NR Radio Access
Narrowband Reference Signal
Network Slice Selection Assistance Information
Narrowband Secondary Synchronization Signal
Paging Control Channel
Physical Downlink Control Channel
Packet Data Convergence Protocol
Protocol Data Unit
Public Land Mobile Network
Pairwise Master Key
Proximity based Services
Public Safety (in context of sidelink), Packet Switched (otherwise)
Primary Secondary Cell
Primary Timing Advance Group
Physical Uplink Control Channel
Preconfigured Uplink Resource
QoS Class Identifier
Quality of Experience
Quality of Service
Random Access CHannel
Release Assistance Indication
Radio Access Technology
RAN Controlled LTE-WLAN Integration
Radio Link Control
Restricted Local Operator Services
RSSI Measurement Timing Configuration
RAN-based Notification Area
RAN-based Notification Area Update
Radio Network Temporary Identifier
RObust Header Compression
Registered Public Land Mobile Network
Radio Resource Control
Received Signal Code Power
Reference Signal Received Power
Reference Signal Received Quality
Received Signal Strength Indicator
System Architecture Evolution
Service Access Point
Satellite Based Augmentation System
Secondary Cell Group
Single Cell MRB
Single Cell RNTI
Sidelink Discovery Reference Signal Received Power
System Frame Number
System Information Block
System Information RNTI
Sidelink Synchronisation Signal
Security Mode Control
SS/PBCH Block Measurement Timing Configuration
Short Processing Time
Signalling Radio Bearer
Sidelink Reference Signal Received Power
Service Specific Access Control
SFN and Subframe Timing Difference
Secondary Timing Advance Group
SAE Temporary Mobile Station Identifier
Timing Advance Group
Time Division Duplex
Time Division Multiplexing
Transmit Power Control RNTI
Time Resource Pattern of Transmission
Transmission Time Interval
Time To Trigger
Uplink Data Compression
Universal Integrated Circuit Card
Uplink Shared Channel
User Plane EDT
Coordinated Universal Time
Universal Terrestrial Radio Access Network
Voice over Long Term Evolution
Wireless Local Area Network
In the ASN.1, lower case may be used for some (parts) of the above abbreviations e.g. c-RNTI.