3 Definitions, symbols and abbreviations

36.4203GPPEvolved Universal Terrestrial Radio Access Network (E-UTRAN)Release 17TSX2 general aspects and principles

3.1 Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 [1] 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 [1].

Dual Connectivity: Defined in TS 36.300 [8].

EN-DC: Defined in TS 37.340 [9].

en-gNB: Defined in TS 37.340 [9].

E-RAB: Defined in TS 36.401 [2].

X2 GW: Defined in TS 36.300 [8].

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].

ECM EPS Connection Management

E-RAB E-UTRAN Radio Access Bearer

IAB Integrated Access and Backhaul

MeNB Master eNB

SeNB Secondary eNB

X2-C X2 Control plane

X2 GW X2 GateWay