3 Definitions, symbols and abbreviations

36.4243GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN)Release 17TSX2 data transport

3.1 Definitions

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 [1].

Corresponding E-UTRAN node: Used in this specification according to the definition of the corresponding node in TS 38.425 [11].

Dual Connectivity: Defined in TS 36.300 [8].

EN-DC: Defined in TS 37.340 [10].

E-RAB: Defined in TS 36.401 [7].

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.

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].

DC Dual Connectivity


EN-DC E-UTRA-NR Dual Connectivity

E-RAB E-UTRAN Radio Access Bearer


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