3 Definitions, symbols and abbreviations
36.4243GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN)Release 17TSX2 data transport
For the purposes of the present document, the following terms and definitions below apply. Terms and definitions not defined below can be found in TR 21.905 .
Corresponding E-UTRAN node: Used in this specification according to the definition of the corresponding node in TS 38.425 .
Dual Connectivity: Defined in TS 36.300 .
EN-DC: Defined in TS 37.340 .
E-RAB: Defined in TS 36.401 .
X2: logical interface between two eNBs. Whilst logically representing a point to point link between eNBs, the physical realisation need not be a point to point link.
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 .
DC Dual Connectivity
eNB E-UTRAN Node B
EN-DC E-UTRA-NR Dual Connectivity
E-RAB E-UTRAN Radio Access Bearer
E-UTRAN Evolved UTRAN
GTP GPRS Tunnelling Protocol
IP Internet Protocol
MeNB Master eNB
PDCP Packet Data Convergence Protocol
PDU Protocol Data Unit
SCG Secondary Cell Group
SeNB Secondary eNB
TEID Tunnel Endpoint Identifier
UDP User Datagram Protocol