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Content for  TS 36.423  Word version:  16.4.0

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1  ScopeWord‑p. 14
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

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".
→ to date, withdrawn by 3GPP
[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".
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3  Definitions, symbols and abbreviationsWord‑p. 16

3.1  Definitions

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.
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.
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3.2  SymbolsWord‑p. 17
For the purposes of the present document, the following symbols apply:
<symbol>
<Explanation>

3.3  Abbreviations

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
BL
Bandwidth reduced Low complexity
CCO
Cell Change Order
CE
Coverage Enhancement
CHO
Conditional Handover
CoMP
Coordinated Multi Point
DAPS
Dual Active Protocol Stacks
DC
Dual Connectivity
DL
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
EP
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
IE
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
NR
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
SN
Sequence Number
SSID
Service Set Identifier
TAC
Tracking Area Code
UE
User Equipment
UL
Uplink
V2X
Vehicle-to-Everything
WLAN
Wireless Local Area Network
WT
WLAN Termination
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