38.3313GPPNRProtocol specificationRadio Resource Control (RRC)Release 15TS
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 .
CEIL: Mathematical function used to ’round up’ i.e. to the nearest integer having a higher or equal value.
Dedicated signalling: Signalling sent on DCCH logical channel between the network and a single UE.
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.
Information element: A structural element containing single or multiple fields is referred as information element.
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.
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.
PUSCH-Less SCell: An SCell configured without PUSCH.
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.
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 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 .
SSB Frequency: Frequency referring to the position of resource element RE=#0 (subcarrier #0) of resource block RB#10 of the SS block.
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 22.214.171.124.
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
AM Acknowledged Mode
ARQ Automatic Repeat Request
AS Access Stratum
ASN.1 Abstract Syntax Notation One
BLER Block Error Rate
BWP Bandwidth Part
CA Carrier Aggregation
CCCH Common Control Channel
CG Cell Group
CMAS Commercial Mobile Alert Service
CP Control Plane
C-RNTI Cell RNTI
CSI Channel State Information
DC Dual Connectivity
DCCH Dedicated Control Channel
DCI Downlink Control Information
DL-SCH Downlink Shared Channel
DM-RS Demodulation Reference Signal
DRB (user) Data Radio Bearer
DRX Discontinuous Reception
DTCH Dedicated Traffic Channel
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
GERAN GSM/EDGE Radio Access Network
GNSS Global Navigation Satellite System
GSM Global System for Mobile Communications
HARQ Hybrid Automatic Repeat Request
IE Information element
IMSI International Mobile Subscriber Identity
kB Kilobyte (1000 bytes)
L1 Layer 1
L2 Layer 2
L3 Layer 3
MAC Medium Access Control
MCG Master Cell Group
MIB Master Information Block
MR-DC Multi-Radio Dual Connectivity
N/A Not Applicable
NE-DC NR E-UTRA Dual Connectivity
(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
NR-DC NR-NR Dual Connectivity
NR/5GC NR connected to 5GC
PCell Primary Cell
PDCP Packet Data Convergence Protocol
PDU Protocol Data Unit
PLMN Public Land Mobile Network
PSCell Primary SCG Cell
PWS Public Warning System
QoS Quality of Service
RAN Radio Access Network
RAT Radio Access Technology
RLC Radio Link Control
RNA RAN-based Notification Area
RNTI Radio Network Temporary Identifier
ROHC Robust Header Compression
RRC Radio Resource Control
RS Reference Signal
SCell Secondary Cell
SCG Secondary Cell Group
SFN System Frame Number
SFTD SFN and Frame Timing Difference
SI System Information
SIB System Information Block
SpCell Special Cell
SRB Signalling Radio Bearer
SSB Synchronization Signal Block
TAG Timing Advance Group
TDD Time Division Duplex
TM Transparent Mode
UE User Equipment
UM Unacknowledged Mode
UP User Plane
In the ASN.1, lower case may be used for some (parts) of the above abbreviations e.g. c-RNTI.