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.
byte segment:
A byte of the Data field of an AMD PDU. Specifically, byte segment number 0 corresponds to the first byte of the Data field of an AMD PDU.
Data field element:
An RLC SDU or an RLC SDU segment that is mapped to the Data field.
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.
RLC SDU segment:
A segment of an RLC SDU.
Sidelink communication:
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.
For the purposes of the present document, the following abbreviations apply:
AM
Acknowledged Mode
AMD
AM Data
ARQ
Automatic Repeat reQuest
BCCH
Broadcast Control CHannel
BCH
Broadcast CHannel
BR-BCCH
Bandwidth Reduced Broadcast Control CHannel
CCCH
Common Control CHannel
DCCH
Dedicated Control CHannel
DL
DownLink
DL-SCH
DL-Shared CHannel
DTCH
Dedicated Traffic CHannel
E
Extension bit
eNB
E-UTRAN Node B
E-UTRA
Evolved UMTS Terrestrial Radio Access
E-UTRAN
Evolved UMTS Terrestrial Radio Access Network
FI
Framing Info
HARQ
Hybrid ARQ
LI
Length Indicator
LSF
Last Segment Flag
MAC
Medium Access Control
MCCH
Multicast Control Channel
MTCH
Multicast Traffic Channel
NB-IoT
NarrowBand Internet of Things
PCCH
Paging Control CHannel
PDU
Protocol Data Unit
PS
Public Safety
RLC
Radio Link Control
RRC
Radio Resource Control
SAP
Service Access Point
SBCCH
Sidelink Broadcast Control Channel
SC-MCCH
Single Cell Multicast Control Channel
SC-MTCH
Single Cell Multicast Transport Channel
SDU
Service Data Unit
SN
Sequence Number
SO
Segment Offset
STCH
Sidelink Traffic Channel
TB
Transport Block
TM
Transparent Mode
TMD
TM Data
UE
User Equipment
UL
UpLink
UM
Unacknowledged Mode
UMD
UM Data
V2X
Vehicle-to-Everything