3 Definitions, symbols and abbreviations
36.3313GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Protocol specificationRadio Resource Control (RRC)Release 17TS
3.1 Definitions
For the purposes of the present document, the terms and definitions given in TR 21.905 [1] 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 [1].
Anchor carrier: 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.
Bandwidth Reduced: Refers to operation in downlink and uplink with a limited channel bandwidth of 6 PRBs.
CEIL: Mathematical function used to ’round up’ i.e. to the nearest integer having a higher or equal value.
Cellular IoT EPS Optimisation: Provides improved support of small data transfer, as defined in TS 24.301 [35].
Commercial Mobile Alert System: 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: 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 [95].
Control plane CIoT EPS optimisation: 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 [35].
Control plane EDT: Early Data Transmission used with the Control plane CIoT EPS optimisation or Control plane CIoT 5GS optimisation.
Coverage-based paging: 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 [9].
CSG member cell: 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.
DAPS bearer: 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.
Dual Connectivity: A UE in RRC_CONNECTED is configured with Dual Connectivity when configured with a Master and a Secondary Cell Group.
Early Data Transmission: Allows one uplink data transmission optionally followed by one downlink data transmission during the random access procedure as specified in TS 36.300 [9]. 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.
Early Security Reactivation: Re-activation of AS security prior to the transmission of RRCConnectionResumeRequest message when a UE is provided with an NCC value during suspension.
Ephemeris: 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 [81].
EU-Alert: Public Warning System that delivers Warning Notifications provided by Warning Notification Providers using the same AS mechanisms as defined for CMAS.
Field: The individual contents of an information element are referred as fields.
FLOOR: Mathematical function used to ’round down’ i.e. to the nearest integer having a lower or equal value.
FR1: Frequency range 1 as defined in clause 5.1 of TS 38.101-1 [85].
FR2: Frequency range 2 as defined in clause 5.1 of TS 38.101-2 [100].
Geosynchronous Orbit: 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.
Information element: 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 [9].
MBMS service: MBMS bearer service as defined in TS 23.246 [56] (i.e. provided via an MRB or an SC-MRB).
NB-IoT: NB-IoT allows access to network services via E-UTRA with a channel bandwidth limited to 200 kHz.
NB-IoT UE: A UE that uses NB-IoT.
NCSG: Network controlled small gap as defined in TS 36.133 [16].
Non-geosynchronous orbit: 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).
Non-terrestrial networks: 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 [81].
Non-anchor carrier: 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 [104], between two or more nearby UEs, using NR technology but not traversing any network node.
Primary Cell: 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.
PUCCH SCell: 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.
Satellite: A space-borne vehicle orbiting the Earth that carries the NTN payload.
Secondary Cell: 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.
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 one or more cells comprising of the primary cell and all secondary cells.
Sidelink: 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 [68].
Sidelink communication: AS functionality enabling ProSe Direct Communication as defined in TS 23.303 [68], 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.
Sidelink discovery: AS functionality enabling ProSe Direct Discovery as defined in TS 23.303 [68], using E-UTRA technology but not traversing any network node.
Sidelink operation: Includes sidelink communication, V2X sidelink communication and sidelink discovery.
Split SRB: 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 [81].
Timing Advance Group: 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: Allows one uplink data transmission using preconfigured uplink resource from RRC_IDLE mode as specified in TS 36.300 [9]. Transmission using PUR refers to both CP transmission using PUR and UP transmission using PUR.
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 5.3.8.7.
UE in CE: 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: 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 [95].
User plane CIoT EPS optimisation: 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 [35].
User plane EDT: 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 [78], between nearby UEs, using E-UTRA technology but not traversing any network node.
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in TR 21.905 [1], TS 36.300 [9] 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 [1] or TS 36.300 [9].
1xRTT CDMA2000 1x Radio Transmission Technology
AB Access Barring
ACDC Application specific Congestion control for Data Communication
ACK Acknowledgement
AILC Assistance Information bit for Local Cache
AM Acknowledged Mode
ANDSF Access Network Discovery and Selection Function
ARQ Automatic Repeat Request
AS Access Stratum
ASN.1 Abstract Syntax Notation One
AUL Autonomous Uplink
BCCH Broadcast Control Channel
BCD Binary Coded Decimal
BCH Broadcast Channel
BL Bandwidth reduced Low complexity
BLER Block Error Rate
BR Bandwidth Reduced
BR-BCCH Bandwidth Reduced Broadcast Control Channel
CA Carrier Aggregation
CAS Cell Acquisition Subframes
CBP Coverage-Based Paging
CBR Channel Busy Ratio
CCCH Common Control Channel
CCO Cell Change Order
CE Coverage Enhancement
CFI Control Format Indicator
CG Cell Group
CHO Conditional Handover
CIoT Cellular IoT
CMAS Commercial Mobile Alert Service
CP Control Plane
CPA Conditional PSCell Addition
CPC Conditional PSCell Change
CP-EDT Control Plane EDT
C-RNTI Cell RNTI
CRS Cell-specific Reference Signal
CSFB CS fallback
CSG Closed Subscriber Group
CSI Channel State Information
DAPS Dual Active Protocol Stack
DC Dual Connectivity
DCCH Dedicated Control Channel
DCI Downlink Control Information
DCN Dedicated Core Networks
DFN Direct Frame Number
DL Downlink
DL-SCH Downlink Shared Channel
DRB (user) Data Radio Bearer
DRX Discontinuous Reception
DTCH Dedicated Traffic Channel
EAB Extended Access Barring
ECEF Earth-Centered, Earth-Fixed
ECI Earth-Centered Inertial
eDRX Extended DRX
EDT Early Data Transmission
EHPLMN Equivalent Home Public Land Mobile Network
eIMTA Enhanced Interference Management and Traffic Adaptation
ENB Evolved Node B
EN-DC E-UTRA NR Dual Connectivity with E-UTRAN connected to EPC
EPC Evolved Packet Core
EPDCCH Enhanced Physical Downlink Control Channel
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
GERAN GSM/EDGE Radio Access Network
GNSS Global Navigation Satellite System
G-RNTI Group RNTI
GSM Global System for Mobile Communications
GSO Geosynchronous Orbit
GWUS Group Wake Up Signal
HARQ Hybrid Automatic Repeat Request
HFN Hyper Frame Number
HPLMN Home Public Land Mobile Network
HRPD CDMA2000 High Rate Packet Data
HSDN High Speed Dedicated Network
H-SFN Hyper SFN
IAB Integrated Access and Backhaul
IAB-DU IAB-node DU
IAB-MT IAB Mobile Termination
IDC In-Device Coexistence
IE Information element
IMEI International Mobile Equipment Identity
IMSI International Mobile Subscriber Identity
IoT Internet of Things
ISM Industrial, Scientific and Medical
kB Kilobyte (1000 bytes)
L1 Layer 1
L2 Layer 2
L3 Layer 3
LAA Licensed-Assisted Access
LWA LTE-WLAN Aggregation
LWAAP LTE-WLAN Aggregation Adaptation Protocol
LWIP LTE-WLAN Radio Level Integration with IPsec Tunnel
MAC Medium Access Control
MBMS Multimedia Broadcast Multicast Service
MBSFN Multimedia Broadcast multicast service Single Frequency Network
MCG Master Cell Group
MCOT Maximum Channel Occupancy Time
MCPTT Mission Critical Push To Talk
MDT Minimization of Drive Tests
MIB Master Information Block
MO Mobile Originating
MPDCCH MTC Physical Downlink Control Channel
MRB MBMS Point to Multipoint Radio Bearer
MR-DC Multi-Radio Dual Connectivity
MRO Mobility Robustness Optimisation
MSI MCH Scheduling Information
MT Mobile Terminating
MTSI Multimedia Telephony Service for IMS
MUSIM Multi-Universal Subscriber Identity Module
MUST MultiUser Superposition Transmission
N/A Not Applicable
NACC Network Assisted Cell Change
NAICS Network Assisted Interference Cancellation/Suppression
NAS Non Access Stratum
NB-IoT NarrowBand Internet of Things
NE-DC NR E-UTRA Dual Connectivity
(NG)EN-DC E-UTRA NR Dual Connectivity (i.e. covering both EN-DC and NGEN-DC)
NGEN-DC E-UTRA NR Dual Connectivity with E-UTRAN connected to 5GC
NGSO Non-Geosynchronous Orbit
NPBCH Narrowband Physical Broadcast channel
NPDCCH Narrowband Physical Downlink Control channel
NPDSCH Narrowband Physical Downlink Shared channel
NPRACH Narrowband Physical Random Access channel
NPSS Narrowband Primary Synchronization Signal
NPUSCH Narrowband Physical Uplink Shared channel
NR NR Radio Access
NRS Narrowband Reference Signal
NSSAI Network Slice Selection Assistance Information
NSSS Narrowband Secondary Synchronization Signal
NTN Non-Terrestrial Network
OS OFDM Symbol
P2X Pedestrian-to-Everything
PCCH Paging Control Channel
PCell Primary Cell
PDCCH Physical Downlink Control Channel
PDCP Packet Data Convergence Protocol
PDU Protocol Data Unit
PLMN Public Land Mobile Network
PMK Pairwise Master Key
PO Paging Occasion
posSIB Positioning SIB
ProSe Proximity based Services
PS Public Safety (in context of sidelink), Packet Switched (otherwise)
PSCell Primary Secondary Cell
PSK Pre-Shared Key
PTAG Primary Timing Advance Group
PUCCH Physical Uplink Control Channel
PUR Preconfigured Uplink Resource
QCI QoS Class Identifier
QoE Quality of Experience
QoS Quality of Service
RACH Random Access CHannel
RAI Release Assistance Indication
RAT Radio Access Technology
RB Radio Bearer
RCLWI RAN Controlled LTE-WLAN Integration
RLC Radio Link Control
RLOS Restricted Local Operator Services
RMTC RSSI Measurement Timing Configuration
RN Relay Node
RNA RAN-based Notification Area
RNAU RAN-based Notification Area Update
RNTI Radio Network Temporary Identifier
ROHC RObust Header Compression
RPLMN Registered Public Land Mobile Network
RRC Radio Resource Control
RSCP Received Signal Code Power
RSRP Reference Signal Received Power
RSRQ Reference Signal Received Quality
RSS Resynchronisation signal
RSSI Received Signal Strength Indicator
SAE System Architecture Evolution
SAP Service Access Point
SBAS Satellite Based Augmentation System
SC Sidelink Control
SCell Secondary Cell
SCG Secondary Cell Group
SC-MRB Single Cell MRB
SC-RNTI Single Cell RNTI
SD-RSRP Sidelink Discovery Reference Signal Received Power
SFN System Frame Number
SI System Information
SIB System Information Block
SI-RNTI System Information RNTI
SL Sidelink
SLSS Sidelink Synchronisation Signal
SMC Security Mode Control
SMTC SS/PBCH Block Measurement Timing Configuration
SPDCCH Short PDCCH
SPS Semi-Persistent Scheduling
SPT Short Processing Time
SPUCCH Short PUCCH
SR Scheduling Request
SRB Signalling Radio Bearer
S-RSRP Sidelink Reference Signal Received Power
SSAC Service Specific Access Control
SSTD SFN and Subframe Timing Difference
STAG Secondary Timing Advance Group
S-TMSI SAE Temporary Mobile Station Identifier
STTI Short TTI
TA Tracking Area
TAG Timing Advance Group
TDD Time Division Duplex
TDM Time Division Multiplexing
TLE Two-Line Element
TM Transparent Mode
TN Terrestrial Network
TPC-RNTI Transmit Power Control RNTI
T-RPT Time Resource Pattern of Transmission
TTI Transmission Time Interval
TTT Time To Trigger
UDC Uplink Data Compression
UE User Equipment
UICC Universal Integrated Circuit Card
UL Uplink
UL-SCH Uplink Shared Channel
UM Unacknowledged Mode
UP User Plane
UP-EDT User Plane EDT
UTC Coordinated Universal Time
UTRAN Universal Terrestrial Radio Access Network
V2X Vehicle-to-Everything
VoLTE Voice over Long Term Evolution
WLAN Wireless Local Area Network
WT WLAN Termination
WUS Wake-up Signal
In the ASN.1, lower case may be used for some (parts) of the above abbreviations e.g. c-RNTI.