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Content for  TS 38.423  Word version:  17.1.0

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1  Scopep. 15

The present document specifies the radio network layer signalling procedures of the control plane between NG-RAN nodes in NG-RAN. XnAP supports the functions of the Xn interface by signalling procedures defined in this document. XnAP is developed in accordance to the general principles stated in TS 38.401 and TS 38.420.

2  Referencesp. 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.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 38.401: "NG-RAN; Architecture Description".
TS 38.420: "NG-RAN; Xn General Aspects and Principles".
TS 38.422: "NG-RAN; Xn Signalling Transport".
TS 38.413: "NG-RAN; NG Application Protocol (NGAP) ".
TS 25.921: "Guidelines and principles for protocol description and error handling".
TS 23.501: "System Architecture for the 5G System".
TS 37.340: "Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Multi-connectivity; Stage 2".
TS 38.300: "NR; NR and NG-RAN Overall Description; Stage 2".
TS 38.331: "NR; Radio Resource Control (RRC) Protocol specification".
TS 38.323: "NR; Packet Data Convergence Protocol (PDCP) specification".
TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2".
TS 23.502: "Procedures for the 5G System; Stage 2".
TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC) protocol specification".
ITU-T Recommendation X.691 (2002-07): "Information technology - ASN.1 encoding rules - Specification of Packed Encoding Rules (PER) ".
ITU-T Recommendation X.680 (2002-07): "Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation".
ITU-T Recommendation X.681 (2002-07): "Information technology - Abstract Syntax Notation One (ASN.1): Information object specification".
TS 29.281: "General Packet Radio Service (GPRS); Tunnelling Protocol User Plane (GTPv1-U)".
TS 38.424: "NG-RAN; Xn data transport".
TS 38.414: "NG-RAN; NG data transport".
TS 38.412: "NG-RAN; NG Signalling Transport".
TS 23.003: "Numbering, Addressing and Identification".
TS 32.422: "Trace control and configuration management".
TS 38.104: "NR; Base Station (BS) radio transmission and reception".
TS 36.104: "Base Station (BS) radio transmission and reception ".
TS 36.211: "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation".
TS 36.101: "User Equipment (UE) radio transmission and reception".
TS 33.501: "Security architecture and procedures for 5G System".
TS 33.401: "3GPP System Architecture Evolution (SAE); Security architecture".
TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
TS 36.413: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP)".
TS 25.413: "UTRAN Iu interface RANAP signalling".
TS 38.304: "NR; User Equipment (UE) procedures in Idle mode and RRC Inactive state".
TS 36.304: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) procedures in idle mode".
TS 38.321: "NR; Medium Access Control (MAC) protocol specification".
TS 36.321: "Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification".
RFC 5905:  "Network Time Protocol Version 4: Protocol and Algorithms Specification".
TS 23.287: "Architecture enhancements for 5G System (5GS) to support Vehicle-to-Everything (V2X) services".
TS 38.211: "NR; Physical channels and modulation".
TS 38.213: "NR; Physical layer procedures for control".
TS 38.473: "NG-RAN; F1 application protocol (F1AP)".
TS 38.314: "NR; Layer 2 measurements".
TS 37.320: "Radio measurement collection for Minimization of Drive Tests (MDT)"
TS 36.423: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 application protocol (X2AP)".
TS 29.244: "Interface between the Control Plane and the User Plane Nodes; Stage 3".
TS 23.247: "Architectural enhancements for 5G multicast-broadcast services; Stage 2".
TS 26.247: "Transparent end-to-end Packet-switched Streaming Service (PSS); Progressive Download and Dynamic Adaptive Streaming over HTTP (3GP-DASH)".
TS 23.304: "Proximity based Services (ProSe) in the 5G System (5GS)".
TS 38.455: "NG-RAN; NR Positioning Protocol A (NRPPa)".
TS 29.571: "5G System; Common Data Types for Service Based Interfaces; Stage 3".
TS 37.213: "NR; Physical layer procedures for shared spectrum channel access".
TS 38.101-1: "NR; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone".
TS 26.114: "IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and interaction".
TS 26.118: "Virtual Reality (VR) profiles for streaming applications".
TS 28.405: "Telecommunication management; Quality of Experience (QoE) measurement collection; Control and configuration".

3  Definitions, symbols and abbreviationsp. 17

3.1  Definitionsp. 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.
CAG Cell:
As defined in TS 38.300.
Conditional Handover:
As defined in TS 38.300.
Conditional PSCell Change:
As defined in TS 37.340.
DAPS Handover:
As defined in TS 38.300.
Elementary Procedure:
XnAP protocol consists of Elementary Procedures (EPs). An XnAP Elementary Procedure is a unit of interaction between two NG-RAN nodes. 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.
F1-terminating IAB-donor:
as defined in TS 38.401.
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.
MBS Session Resource:
As defined in TS 38.300.
NG-RAN node:
as defined in TS 38.300.
Non-CAG Cell:
As defined in TS 38.300.
Non-F1-terminating IAB-donor:
as defined in TS 38.401.
PDU Session Resource:
As defined in TS 38.401.
PDU session split:
as defined in TS 37.340.
Public Network Integrated NPN:
as defined in TS 23.501.
Stand-alone Non-Public Network:
as defined in TS 23.501.

3.2  Abbreviationsp. 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.
5G QoS Identifier
Access and Mobility Management Function
Closed Access Group
Cell Global Identifier
Conditional Handover
Control Plane
Conditional PSCell Addition
Conditional PSCell Addition or Change
Conditional PSCell Change
Dual Active Protocol Stack
E-UTRA-NR Dual Connectivity
E-UTRAN Radio Access Bearer
Globally Unique AMF Identifier
Integrated Access and Backhaul
International Mobile station Equipment Identity and Software Version number
Multicast/Broadcast Service
Master Cell Group
M-NG-RAN node
Master NG-RAN node
NG Application Protocol
Network Identifier
Non-Public Network
Network Slice Selection Assistance Information
Paging Early Indication with Paging Subgrouping
Public Network Integrated Non-Public Network
Proximity Services
RAN Area Code
Reduced Capability
Redundancy Sequence Number
Secondary Cell Group
Stream Control Transmission Protocol
Stand-alone Non-Public Network
S-NG-RAN node
Secondary NG-RAN node
Single Network Slice Selection Assistance Information
Supplementary Uplink
Small Data Transmission
Tracking Area Code
Tracking Area Identity
User Plane Function

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