Content for TS 36.423 Word version: 18.2.0

3.1 Definitions 3.2 Symbols 3.3 Abbreviations
...

1 Scope p. 15

The present document specifies the radio network layer signalling procedures of the control plane between eNBs in E-UTRAN. X2AP supports the functions of X2 interface by signalling procedures defined in this document. X2AP is developed in accordance to the general principles stated in TS 36.401 and TS 36.420.

2 References p. 15

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

[1]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

TS 36.401: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Architecture Description".

[3]

TS 36.420: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 General Aspects and Principles".

[4]

TS 36.413: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP)".

[5]

ITU-T Recommendation X.691 (2002-07): "Information technology - ASN.1 encoding rules - Specification of Packed Encoding Rules (PER) ".

[6]

TS 32.422: "Telecommunication Management; Subscriber and Equipment Trace; Trace Control and Configuration Management".

[7]

TS 32.421: "Telecommunication Management; Subscriber and Equipment Trace; Trace concepts and requirements".

[8]

TS 36.424: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 data transport".

[9]

TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRAN); Radio Resource Control (RRC) Protocol Specification".

[10]

TS 36.211: "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation".

[11]

TS 36.213: "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures ".

[12]

TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".

[13]

TS 23.203: "Policy and charging control architecture".

[14]

TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System; Stage 3".

[15]

TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA), Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; stage 2".

[16]

TS 36.104: "Base Station (BS) radio transmission and reception ".

[17] Void.

[18]

TS 33.401: "Security architecture".

[19]

TS 36.414: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 data transport".

[20]

TS 23.216: "Single Radio Voice Call Continuity (SRVCC)".

[21]

TS 36.422: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 signaling transport".

[22]

TS 36.314: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Layer 2 - Measurements".

[23] Void.

[24]

TS 25.413: "UTRAN Iu interface RANAP signalling"

[25]

TS 37.320: "Universal Terrestrial Radio Access (UTRA) and Evolved Universal Terrestrial Radio Access (E-UTRA); Radio measurement collection for Minimization of Drive Tests (MDT);Overall description; Stage 2".

[26]

TS 29.281: "General Packet Radio Service (GPRS); Tunnelling Protocol User Plane (GTPv1-U)".

[27]

ITU-T Recommendation X.680 (2002-07): "Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation".

[28]

ITU-T Recommendation X.681 (2002-07): "Information technology - Abstract Syntax Notation One (ASN.1): Information object specification".

[29]

TS 23.003: "Technical Specification Group Core Network and Terminals; Numbering, addressing and identification".

[30]

TR 25.921: (version.7.0.0) "Guidelines and principles for protocol description and error handling".

[31]

TS 38.331: "NR; Radio Resource Control (RRC); Protocol Specification".

[32]

TS 37.340: "Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Multi-connectivity; Stage 2".

[33]

TS 38.323: "NR; Packet Data Convergence Protocol (PDCP) specification".

[34]

TS 38.401: "NG-RAN; Architecture description".

[35]

RFC 5905: "Network Time Protocol Version 4: Protocol and Algorithms Specification".

[36]

TS 26.247: "Transparent end-to-end Packet-switched Streaming Service (PSS); Progressive Download and Dynamic Adaptive Streaming over HTTP (3GP-DASH)".

[37]

TS 38.104: "NR; Base Station (BS) radio transmission and reception".

[38]

TS 23.501: "System Architecture for the 5G System"

[39]

TS 38.413: "NG Radio Access Network (NG-RAN); NG Application Protocol (NGAP)".

[40]

TS 36.322: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Link Control (RLC) protocol specification".

[41]

TS 23.285: " Technical Specification Group Services and System Aspects; Architecture enhancements for V2X services".

[42]

TS 38.211: "NR; Physical channels and modulation".

[43]

TS 38.213: "NR; Physical layer procedures for control".

[44]

TS 38.473: "NG-RAN; F1 application protocol (F1AP)".

[45]

TS 38.314: "NR; Layer 2 Measurements".

[46] Void

[47]

TS 38.300: "NR; Overall description; Stage-2".

[48]

TS 38.472: "NG-RAN; F1 signalling transport"

[49]

TS 38.423: "NG-RAN; Xn Application Protocol (XnAP)".

[50]

TS 33.501: "Security architecture and procedures for 5G System".

3 Definitions, symbols and abbreviations p. 17

3.1 Definitions p. 17

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.

ACL functionality:

A functionality controlling the access to network nodes. In case of Access Control Lists (ACL) functionality is applied in a network node the network node may only accept connections from other peer network nodes once the source addresses of the sending network node is already known in the target node.

Elementary Procedure:

X2AP protocol consists of Elementary Procedures (EPs). An X2AP Elementary Procedure is a unit of interaction between two eNBs. An EP consists of an initiating message and possibly a response message. Two kinds of EPs are used:

Class 1: Elementary Procedures with response (success or failure),
Class 2: Elementary Procedures without response.

E-RAB:

Defined in TS 36.401.

CSG Cell:

as defined in TS 36.300.

Dual Connectivity:

as defined in TS 36.300.

E-UTRA-NR Dual Connectivity:

as defined in TS 37.340.

E-UTRAN node:

either an eNB or an en-gNB.

Hybrid cell:

as defined in TS 36.300.

Master eNB:

as defined in TS 36.300.

Secondary Cell Group:

as defined in TS 36.300.

Secondary eNB:

as defined in TS 36.300.

en-gNB:

as defined in TS 37.340.

Conditional Handover:

As defined in TS 36.300.

DAPS HO:

As defined in TS 36.300.

Conditional PSCell Change:

As defined in TS 37.340.

Immediate Handover:

Used in the context of Conditional Handover, to refer to a handover that is executed immediately after the UE receives the Handover Command.

IAB-node:

as defined in TS 38.300.

3.2 Symbols p. 18

For the purposes of the present document, the following symbols apply:

3.3 Abbreviations p. 18

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.

ABS

Almost Blank Subframe

ARPI

Additional RRM Policy Index

ACL

Access Control List

BBF

Broadband Forum

Bandwidth reduced Low complexity

CCO

Cell Change Order

Coverage Enhancement

CHO

Conditional Handover

CoMP

Coordinated Multi Point

CPA

Conditional PSCell Addition

CPAC

Conditional PSCell Addition or Change.

CPC

Conditional PSCell Change

DAPS

Dual Active Protocol Stacks

Dual Connectivity

Downlink

EARFCN

E-UTRA Absolute Radio Frequency Channel Number

E-CID

Enhanced Cell-ID (positioning method)

eNB

E-UTRAN NodeB

EN-DC

E-UTRA-NR Dual Connectivity

Elementary Procedure

EPC

Evolved Packet Core

E-RAB

E-UTRAN Radio Access Bearer

E-UTRAN

Evolved UTRAN

GNSS

Global Navigation Satellite System

GUMMEI

Globally Unique MME Identifier

HFN

Hyper Frame Number

IAB

Integrated Access and Backhaul

Information Element

L-GW

Local GateWay

LWA

LTE-WLAN Aggregation

MCG

Master Cell Group

MDT

Minimization of Drive Tests

MeNB

Master eNB

MME

Mobility Management Entity

MTSI

Multimedia Telephony Service for IMS

NAICS

Network-Assisted Interference Cancellation and Suppression

New Radio

PDCP

Packet Data Convergence Protocol

PLMN

Public Land Mobile Network

ProSe

Proximity Service

QMC

QoE Measurement Collection

QoE

Quality of Experience

SCG

Secondary Cell Group

S-GW

Serving Gateway

SeNB

Secondary eNB

SgNB

Secondary gNB

SIPTO

Selected IP Traffic Offload

SIPTO@LN

Selected IP Traffic Offload at the Local Network

Sequence Number

SSID

Service Set Identifier

TAC

Tracking Area Code

User Equipment

Uplink

V2X

Vehicle-to-Everything

WLAN

Wireless Local Area Network

WLAN Termination