3 Definitions, symbols and abbreviations
36.3003GPPEvolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN)Overall descriptionRelease 17Stage 2TS
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply.
Access Control: the process that checks whether a UE is allowed to access and to be granted services in a closed cell.
Aerial UE communication: functionality enabling Aerial UE function as defined in 23.17.
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.
Carrier frequency: center frequency of the cell.
Cell: combination of downlink and optionally uplink resources. The linking between the carrier frequency of the downlink resources and the carrier frequency of the uplink resources is indicated in the system information transmitted on the downlink resources.
Cell Group: in dual connectivity, a group of serving cells associated with either the MeNB or the SeNB.
CHO candidate cell: a candidate cell for CHO, for which UE has been configured with a CHO configuration.
Conditional Handover (CHO): a handover procedure that is executed only when execution condition(s) are met.
Control plane CIoT 5GS Optimisation: Enables support of efficient transport of user data (IP, Ethernet and Unstructured) or SMS messages over control plane via the AMF without triggering user-plane resource establishment, as defined in TS 24.501 [91]. In the context of this specification, a NB-IoT UE that only supports Control plane CIoT 5GS Optimisation is a UE that does not support User plane CIoT 5GS Optimisation and NG-U data transfer but may support other CIoT 5GS Optimisations.
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 [20]. In the context of this specification, a NB-IoT UE that only supports Control plane CIoT EPS optimisation is a UE that does not support User plane CIoT EPS optimisation and S1-U data transfer but may support other CIoT EPS optimisations.
CSG Cell: a cell broadcasting a CSG indicator set to true and a specific CSG identity.
CSG ID Validation: the process that checks whether the CSG ID received via handover messages is the same as the one broadcast by the target E-UTRAN.
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 Handover: a handover procedure that maintains the source eNB connection after reception of RRC message for handover and until releasing the source cell after successful random access to the target eNB.
DCN-ID: DCN identity identifies a specific dedicated core network (DCN).
Dual Connectivity: mode of operation of a UE in RRC_CONNECTED, configured with a Master Cell Group and a Secondary Cell Group.
Early Data Forwarding: data forwarding that is initiated before the UE executes the handover.
en-gNB: as defined in TS 37.340 [76].
Ephemeris: a set of parameters that describe the movement of an NTN node over time.
E-RAB: an E-RAB uniquely identifies the concatenation of an S1 Bearer and the corresponding Data Radio Bearer. When an E-RAB exists, there is a one-to-one mapping between this E-RAB and an EPS bearer of the Non Access Stratum as defined in [17].
Feeder link: wireless link between the NTN Gateway and the NTN payload.
Frequency layer: set of cells with the same carrier frequency.
FeMBMS: further enhanced multimedia broadcast multicast service.
FeMBMS/Unicast-mixed cell: cell supporting MBMS transmission and unicast transmission as SCell.
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.
Handover: procedure that changes the serving cell of a UE in RRC_CONNECTED.
Hybrid cell: a cell broadcasting a CSG indicator set to false and a specific CSG identity. This cell is accessible as a CSG cell by UEs which are members of the CSG and as a normal cell by all other UEs.
Late Data Forwarding: data forwarding that is initiated after the source eNB knows that the UE has successfully accessed a target eNB.
Local Home Network: as defined in TS 23.401 [17].
LTE bearer: in LTE-WLAN Aggregation, a bearer whose radio protocols are located in the eNB only to use eNB radio resources only.
LWA bearer: in LTE-WLAN Aggregation, a bearer whose radio protocols are located in both the eNB and the WLAN to use both eNB and WLAN resources.
LWAAP PDU: in LTE-WLAN Aggregation, a PDU with DRB ID generated by LWAAP entity for transmission over WLAN.
Make-Before-Break HO/SeNB change: maintaining source eNB/SeNB connection after reception of RRC message for handover or change of SeNB before the initial uplink transmission to the target eNB during handover or change of SeNB.
Mapped Cell ID: in NTN, it corresponds to a fixed geographical area.
Master Cell Group: in dual connectivity, a group of serving cells associated with the MeNB, comprising of the PCell and optionally one or more SCells.
Master eNB: in dual connectivity, the eNB which terminates at least S1-MME.
MBMS-dedicated cell: cell dedicated to MBMS transmission.
MBMS/Unicast-mixed cell: cell supporting both unicast and MBMS transmissions.
MCG bearer: in dual connectivity, a bearer whose radio protocols are only located in the MeNB to use MeNB resources only.
Membership Verification: the process that checks whether a UE is a member or non-member of a hybrid cell.
Multi-Connectivity: Mode of operation whereby a multiple Rx/Tx UE in the connected mode is configured to utilise radio resources amongst E-UTRA and/or NR provided by multiple distinct schedulers connected via non-ideal backhaul.
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.
ng-eNB: node providing E-UTRA user plane and control plane protocol terminations towards the UE, and connected via the NG interface to the 5GC.
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.
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: NR radio access
NR sidelink communication: AS functionality enabling at least V2X Communication as defined in TS 23.287 [93], between two or more nearby UEs, using NR technology but not traversing any network node.
NTN Gateway: an earth station located at the surface of the earth, providing connectivity to the NTN payload using the feeder link. An NTN Gateway is a TNL node.
NTN payload: a network node, embarked on board a satellite, providing connectivity functions, between the service link and the feeder link. In the current version of this specification, the NTN payload is a TNL node.
PLMN ID Check: the process that checks whether a PLMN ID is the RPLMN identity or an EPLMN identity of the UE.
Power saving mode: mode configured and controlled by NAS that allows the UE to reduce its power consumption, as defined in TS 24.301 [20], TS 23.401 [17], TS 23.682 [57].
Primary PUCCH group: a group of serving cells including PCell whose PUCCH signalling is associated with the PUCCH on PCell.
Primary Timing Advance Group: Timing Advance Group containing the PCell. In this specification, Primary Timing Advance Group refers also to Timing Advance Group containing the PSCell unless explicitly stated otherwise.
ProSe-enabled Public Safety UE: a UE that the HPLMN has configured to be authorized for Public Safety use, and which is ProSe-enabled and supports ProSe procedures and capabilities specific to Public Safety. The UE may, but need not, have a USIM with one of the special access classes {12, 13, 14}.
ProSe Per-Packet Priority: a scalar value associated with a protocol data unit that defines the priority handling to be applied for transmission of that protocol data unit.
ProSe UE-to-Network Relay: a UE that provides functionality to support connectivity to the network for Remote UE(s).
ProSe UE-to-Network Relay Selection: Process of identifying a potential ProSe UE-to Network Relay, which can be used for connectivity services (e.g. to communicate with a PDN).
ProSe UE-to-Network Relay Reselection: process of changing previously selected ProSe UE-to-Network Relay and identifying potential a new ProSe UE-to-Network Relay, which can be be used for connectivity services (e.g. to communicate with PDN).
Public Safety ProSe Carrier: carrier frequency for public safety sidelink communication and public safety sidelink discovery.
PUCCH group: either primary PUCCH group or a secondary PUCCH group.
PUCCH SCell: a Secondary Cell configured with PUCCH.
RACH-less HO/SeNB change: skipping random access procedure during handover or change of SeNB.
Receive Only Mode: See TS 23.246 [48].
Remote UE: a ProSe-enabled Public Safety UE, that communicates with a PDN via a ProSe UE-to-Network Relay.
Satellite: a space-borne vehicle orbiting the Earth that carries the NTN payload.
SCG bearer: in dual connectivity, a bearer whose radio protocols are only located in the SeNB to use SeNB resources.
Secondary Cell Group: in dual connectivity, a group of serving cells associated with the SeNB, comprising of PSCell and optionally one or more SCells.
Secondary eNB: in dual connectivity, the eNB that is providing additional radio resources for the UE but is not the Master eNB.
Secondary PUCCH group: a group of SCells whose PUCCH signalling is associated with the PUCCH on the PUCCH SCell.
Secondary Timing Advance Group: Timing Advance Group containing neither the PCell nor PSCell.
Service link: wireless link between the NTN payload and the UE.
Short Processing Time: For 1 ms TTI length, the operation with short processing time in UL data transmission and DL data reception.
Short TTI: TTI length based on a slot or a subslot.
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 [62].
Sidelink Control period: period over which resources are allocated in a cell for sidelink control information and sidelink data transmissions. The Sidelink Control period corresponds to the PSCCH period as defined in TS 36.213 [6].
Sidelink communication: AS functionality enabling ProSe Direct Communication as defined in TS 23.303 [62], 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 [62], using E-UTRA technology but not traversing any network node.
Split bearer: in dual connectivity, a bearer whose radio protocols are located in both the MeNB and the SeNB to use both MeNB and SeNB resources.
Split LWA bearer: in LTE-WLAN Aggregation, a bearer whose radio protocols are located in both the eNB and the WLAN to use both eNB and WLAN radio resources.
Switched LWA bearer: in LTE-WLAN Aggregation, a bearer whose radio protocols are located in both the eNB and the WLAN but uses WLAN radio resources only.
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.
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 [91].
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 [20].
V2X sidelink communication: AS functionality enabling V2X Communication as defined in TS 23.285 [72], between nearby UEs, using E-UTRA technology but not traversing any network node.
WLAN Termination: the logical node that terminates the Xw interface on the WLAN side.
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in TR 21.905 [1] 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].
1xCSFB Circuit Switched Fallback to 1xRTT
5GC 5G Core Network
ABS Almost Blank Subframe
AC Access Category
ACK Acknowledgement
ACLR Adjacent Channel Leakage Ratio
AM Acknowledged Mode
AMBR Aggregate Maximum Bit Rate
ANDSF Access Network Discovery and Selection Function
ANR Automatic Neighbour Relation
ARP Allocation and Retention Priority
ARQ Automatic Repeat Request
AS Access Stratum
AUL Autonomous Uplink
BCCH Broadcast Control Channel
BCH Broadcast Channel
BL Bandwidth reduced Low complexity
BR-BCCH Bandwidth Reduced Broadcast Control Channel
BSR Buffer Status Report
C/I Carrier-to-Interference Power Ratio
CA Carrier Aggregation
CAZAC Constant Amplitude Zero Auto-Correlation
CBC Cell Broadcast Center
CC Component Carrier
CG Cell Group
CHO Conditional Handover
CIF Carrier Indicator Field
CIoT Cellular Internet of Things
CMAS Commercial Mobile Alert Service
CMC Connection Mobility Control
C-plane Control Plane
C-RNTI Cell RNTI
CoMP Coordinated Multi Point
CP Cyclic Prefix
CQI Channel Quality Indicator
CRC Cyclic Redundancy Check
CRE Cell Range Extension
CRS Cell-specific Reference Signal
CSA Common Subframe Allocation
CSG Closed Subscriber Group
CSI Channel State Information
CSI-IM CSI interference measurement
CSI-RS CSI reference signal
DAPS Dual Active Protocol Stack
DC Dual Connectivity
DCCH Dedicated Control Channel
DCN Dedicated Core Network
DeNB Donor eNB
DFTS DFT Spread OFDM
DL Downlink
DMTC Discovery Signal Measurement Timing Configuration
DRB Data Radio Bearer
DRS Discovery Reference Signal
DRX Discontinuous Reception
DTCH Dedicated Traffic Channel
DTX Discontinuous Transmission
DwPTS Downlink Pilot Time Slot
E-CID Enhanced Cell-ID (positioning method)
E-RAB E-UTRAN Radio Access Bearer
E-UTRA Evolved UTRA
E-UTRAN Evolved UTRAN
EAB Extended Access Barring
ECGI E-UTRAN Cell Global Identifier
ECM EPS Connection Management
EDT Early Data Transmission
EHC Ethernet Header Compression
eHRPD enhanced High Rate Packet Data
eIMTA Enhanced Interference Management and Traffic Adaptation
EMM EPS Mobility Management
eNB E-UTRAN NodeB
EPC Evolved Packet Core
EPDCCH Enhanced Physical Downlink Control Channel
EPS Evolved Packet System
ETWS Earthquake and Tsunami Warning System
FDD Frequency Division Duplex
FDM Frequency Division Multiplexing
G-RNTI Group RNTI
GBR Guaranteed Bit Rate
GERAN GSM EDGE Radio Access Network
GNSS Global Navigation Satellite System
GP Guard Period
GRE Generic Routing Encapsulation
GSM Global System for Mobile communication
GSO Geosynchronous Orbit
GUMMEI Globally Unique MME Identifier
GUTI Globally Unique Temporary Identifier
GWCN GateWay Core Network
GWUS Group Wake Up Signal
H-SFN Hyper System Frame Number
HARQ Hybrid ARQ
(H)eNB eNB or HeNB
HO Handover
HPLMN Home Public Land Mobile Network
HRPD High Rate Packet Data
HSDPA High Speed Downlink Packet Access
ICIC Inter-Cell Interference Coordination
IDC In-Device Coexistence
IP Internet Protocol
ISM Industrial, Scientific and Medical
KPAS Korean Public Alert System
L-GW Local Gateway
LAA Licensed-Assisted Access
LB Load Balancing
LBT Listen Before Talk
LCG Logical Channel Group
LCR Low Chip Rate
LCS LoCation Service
LEO Low Earth Orbit
LHN Local Home Network
LHN ID Local Home Network ID
LIPA Local IP Access
LMU Location Measurement Unit
LPPa LTE Positioning Protocol Annex
LTE Long Term Evolution
LWA LTE-WLAN Aggregation
LWAAP LTE-WLAN Aggregation Adaptation Protocol
LWIP LTE WLAN Radio Level Integration with IPsec Tunnel
LWIP-SeGW LWIP Security Gateway
MAC Medium Access Control
MBMS Multimedia Broadcast Multicast Service
MBR Maximum Bit Rate
MBSFN Multimedia Broadcast multicast service Single Frequency Network
MCCH Multicast Control Channel
MCE Multi-cell/multicast Coordination Entity
MCG Master Cell Group
MCH Multicast Channel
MCS Modulation and Coding Scheme
MDT Minimization of Drive Tests
MeNB Master eNB
MEO Medium Earth Orbit
MGW Media Gateway
MIB Master Information Block
MIMO Multiple Input Multiple Output
MME Mobility Management Entity
MMTEL Multimedia telephony
MO-EDT Mobile Originated Early Data Transmission
MPDCCH MTC Physical Downlink Control Channel
MSA MCH Subframe Allocation
MSI MCH Scheduling Information
MSP MCH Scheduling Period
MT-EDT Mobile Terminated Early Data Transmission
MTC Machine-Type Communications
MTCH Multicast Traffic Channel
MTSI Multimedia Telephony Service for IMS
MUSIM Multi-Universal Subscriber Identity Module
N2 Reference point between the NG-RAN and the AMF
NACK Negative Acknowledgement
NAS Non-Access Stratum
NB-IoT Narrow Band Internet of Things
NCC Next Hop Chaining Counter
NCGI NR Cell Global Identifier
NCR Neighbour Cell Relation
NG-RAN NG Radio Access Network
NGSO Non-Geosynchronous Orbit
NH Next Hop key
NNSF NAS Node Selection Function
NPBCH Narrowband Physical Broadcast channel
NPDCCH Narrowband Physical Downlink Control channel
NPDSCH Narrowband Physical Downlink Shared channel
NPRACH Narrowband Physical Random Access channel
NPUSCH Narrowband Physical Uplink Shared channel
NPRS Narrowband Positioning Reference Signal
NPSS Narrowband Primary Synchronization Signal
NR NR Radio Access
NRT Neighbour Relation Table
NSSS Narrowband Secondary Synchronization Signal
NTN Non-Terrestrial Network
OFDM Orthogonal Frequency Division Multiplexing
OFDMA Orthogonal Frequency Division Multiple Access
OPI Offload Preference Indicator
OTDOA Observed Time Difference Of Arrival (positioning method)
P-GW PDN Gateway
P-RNTI Paging RNTI
PA Power Amplifier
PAPR Peak-to-Average Power Ratio
PBCH Physical Broadcast CHannel
PBR Prioritised Bit Rate
PCC Primary Component Carrier
PCCH Paging Control Channel
PCell Primary Cell
PCFICH Physical Control Format Indicator CHannel
PCH Paging Channel
PCI Physical Cell Identifier
PDCCH Physical Downlink Control CHannel
PDCP Packet Data Convergence Protocol
PDN Packet Data Network
PDSCH Physical Downlink Shared CHannel
PDU Protocol Data Unit
PHICH Physical Hybrid ARQ Indicator CHannel
PHY Physical layer
PLMN Public Land Mobile Network
PMCH Physical Multicast CHannel
PMK Pairwise Master Key
PPPP ProSe Per-Packet Priority
PPPR ProSe Per-Packet Reliability
PRACH Physical Random Access CHannel
PRB Physical Resource Block
ProSe Proximity based Services
PSBCH Physical Sidelink Broadcast CHannel
PSC Packet Scheduling
PSCCH Physical Sidelink Control CHannel
PSCell Primary SCell
PSDCH Physical Sidelink Discovery CHannel
PSK Pre-Shared Key
PSM Power Saving Mode
PSSCH Physical Sidelink Shared CHannel
pTAG Primary Timing Advance Group
PTW Paging Time Window
PUCCH Physical Uplink Control CHannel
PUR Preconfigured Uplink Resource
PUR-RNTI Preconfigured Uplink Resource RNTI
PUSCH Physical Uplink Shared CHannel
PWS Public Warning System
QAM Quadrature Amplitude Modulation
QCI QoS Class Identifier
QoE Quality of Experience
QoS Quality of Service
R-PDCCH Relay Physical Downlink Control CHannel
RA-RNTI Random Access RNTI
RAC Radio Admission Control
RACH Random Access Channel
RANAC RAN-based Notification Area code
RAT Radio Access Technology
RB Radio Bearer
RBC Radio Bearer Control
RCLWI RAN Controlled LTE-WLAN Interworking
RF Radio Frequency
RIBS Radio-interface based synchronization
RIM RAN Information Management
RLC Radio Link Control
RMTC RSSI Measurement Timing Configuration
RN Relay Node
RNA RAN-based Notification Area
RNAU RAN-based Notification Area Update
RNC Radio Network Controller
RNL Radio Network Layer
RNTI Radio Network Temporary Identifier
ROHC Robust Header Compression
ROM Receive Only Mode
RRC Radio Resource Control
RRM Radio Resource Management
RTT Round Trip Time
RU Resource Unit
S-GW Serving Gateway
S-RSRP Sidelink Reference Signal Received Power
S1-MME S1 for the control plane
SAE System Architecture Evolution
SAP Service Access Point
SBCCH Sidelink Broadcast Control Channel
SC-FDMA Single Carrier – Frequency Division Multiple Access
SC-MCCH Single Cell Multicast Control Channel
SC-MTCH Single Cell Multicast Transport Channel
SC-N-RNTI Single Cell Notification RNTI
SC-PTM Single Cell Point To Multiploint
SC-RNTI Single Cell RNTI
SCC Secondary Component Carrier
SCell Secondary Cell
SCG Secondary Cell Group
SCH Synchronization Channel
SCTP Stream Control Transmission Protocol
SD-RSRP Sidelink Discovery Reference Signal Received Power
SDAP Service Data Adaptation Protocol
SDF Service Data Flow
SDMA Spatial Division Multiple Access
SDU Service Data Unit
SeGW Security Gateway
SeNB Secondary eNB
SFN System Frame Number
SI System Information
SI-RNTI System Information RNTI
S1-U S1 for the user plane
SIB System Information Block
SIPTO Selected IP Traffic Offload
SIPTO@LN Selected IP Traffic Offload at the Local Network
SL-BCH Sidelink Broadcast Channel
SL-DCH Sidelink Discovery Channel
SL-RNTI Sidelink RNTI
SL-SCH Sidelink Shared Channel
SPDCCH Short PDCCH
SPID Subscriber Profile ID for RAT/Frequency Priority
SPT Short Processing Time
SPUCCH Short PUCCH
SR Scheduling Request
SRB Signalling Radio Bearer
sTAG Secondary Timing Advance Group
STCH Sidelink Traffic Channel
SU Scheduling Unit
TA Tracking Area
TAC Tracking Area Code
TAG Timing Advance Group
TB Transport Block
TCP Transmission Control Protocol
TDD Time Division Duplex
TDM Time Division Multiplexing
TEID Tunnel Endpoint Identifier
TFT Traffic Flow Template
TM Transparent Mode
TMGI Temporary Mobile Group Identity
TNL Transport Network Layer
TTI Transmission Time Interval
U-plane User plane
UAC Unified Access Control
UDC Uplink Data Compression
UE User Equipment
UL Uplink
UM Unacknowledged Mode
UMTS Universal Mobile Telecommunication System
UpPTS Uplink Pilot Time Slot
UTRA Universal Terrestrial Radio Access
UTRAN Universal Terrestrial Radio Access Network
V2I Vehicle-to-Infrastructure
V2N Vehicle-to-Network
V2P Vehicle-to-Pedestrian
V2V Vehicle-to-Vehicle
V2X Vehicle-to-Everything
VRB Virtual Resource Block
WLAN Wireless Local Area Network
WT WLAN Termination
WUS Wake Up Signal
X2-C X2-Control plane
X2 GW X2 GateWay
X2-U X2-User plane
Xw-C Xw-Control plane
Xw-U Xw-User plane