3 Definitions of terms, symbols and abbreviations

37.4703GPPGeneral aspects and principlesRelease 17TSW1 interface

3.1 Terms

For the purposes of the present document, the terms and definitions given in 3GPP 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 3GPP TR 21.905 [1].

W1: interface between an ng-eNB-CU and an ng- eNB-DU, providing an interconnection point between the ng-eNB-CU and the ng-eNB-DU.

W1-C: Reference point for the control plane protocol between ng-eNB-CU and ng-eNB-DU.

ng-eNB-CU: a logical node hosting RRC, SDAP and PDCP protocols of the ng-eNB that controls the operation of one or more ng-eNB-DUs. The ng-eNB-CU terminates the W1 interface connected with the ng-eNB-DU.

ng-eNB-DU: a logical node hosting RLC, MAC and PHY layers of the ng-eNB, and its operation is partly controlled by ng-eNB-CU. One ng-eNB-DU supports one or multiple cells. One cell is supported by only one ng-eNB-DU. The ng-eNB-DU terminates the W1 interface connected with the ng-eNB-CU.

ng-eNB: as defined in TS 38.300 [3].

3.2 Symbols

Void.

3.3 Abbreviations

For the purposes of the present document, the abbreviations given in 3GPP 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 3GPP TR 21.905 [1].

DRB Data Radio Bearers

W1-U W1 User plane interface

W1-C W1 Control plane interface

W1AP W1 Application Protocol

GTP-U GPRS Tunnelling Protocol

IP Internet Protocol

NR-MIB NR-Master Information Block

O&M Operation and Maintenance

PA Paging Area

PF Paging Frame

PO Paging Occasion

QoS Quality of Service

RRC Radio Resource Control

SCTP Stream Control Transmission Protocol

SRB Signalling Radio Bearers

SIB1 System Information Block 1

TNL Transport Network Layer