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TECHNICAL SPECIFICATION
5G;
NG-RAN;
Xn general aspects and principles
(3GPP TS 38.420 version 15.1.0 Release 15)
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3GPP TS 38.420 version 15.1.0 Release 15 1 ETSI TS 138 420 V15.1.0 (2018-09)
Reference
RTS/TSGR-0338420vf10
Keywords
5G
ETSI
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3GPP TS 38.420 version 15.1.0 Release 15 2 ETSI TS 138 420 V15.1.0 (2018-09)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
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Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 38.420 version 15.1.0 Release 15 3 ETSI TS 138 420 V15.1.0 (2018-09)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
2 References . 6
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 7
4 General aspects . 7
4.1 Introduction . 7
4.2 Xn interface general principles . 7
4.3 Xn interface specification objectives . 7
4.4 Xn interface capabilities . 7
5 Functions of the Xn interface . 7
5.1 General . 7
5.2 Functions of Xn-C . 8
5.2.1 Xn-C interface management and error handling functions . 8
5.2.1.1 General . 8
5.2.1.2 Xn Setup function . 8
5.2.1.3 Error Indication function . 8
5.2.1.4 Xn reset function . 8
5.2.1.5 Xn configuration data update function . 8
5.2.1.6 Xn removal function . 8
5.2.2 UE mobility management functions . 8
5.2.2.1 Handover preparation function. 8
5.2.2.2 Handover cancellation function . 8
5.2.2.3 Retrieve UE Context function . 8
5.2.2.4 RAN Paging function . 8
5.2.2.5 Data Forwarding control function . 8
5.2.3 Dual connectivity function . 8
5.2.4 Energy saving function . 9
5.3 Functions of Xn-U . 9
5.3.1 Data transfer function . 9
5.3.2 Flow control function. 9
5.3.3 Assistance information function . 9
5.3.4 Fast retransmission function . 9
6 Xn interface procedures. 9
6.1 General . 9
6.2 Control plane protocol procedures . 9
6.2.1 Mobility management procedures . 9
6.2.2 Dual Connectivity procedures. 9
6.2.3 Global procedures . 10
6.2.4 Interface Management procedures . 10
6.2.5 Energy saving procedures . 10
6.3 User plane protocol procedures . 10
7 Xn interface protocol structure . 10
7.1 Xn Control Plane . 10
7.2 Xn User Plane . 11
8 Other Xn interface specifications . 12
8.1 NG-RAN Xn interface: Xn layer 1 (TS 38.421). 12
8.2 NG-RAN Xn interface: Xn signalling transport (TS 38.422) . 12
ETSI
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3GPP TS 38.420 version 15.1.0 Release 15 4 ETSI TS 138 420 V15.1.0 (2018-09)
8.3 NG-RAN Xn interface: Xn application protocol (XnAP) (TS 38.423) . 12
8.4 NG-RAN Xn interface: Xn data transport (TS 38.424) . 12
8.5 NG-RAN Xn interface: NR user plane protocol (TS 38.425) . 12
8.6 NG-RAN Xn interface: PDU Session User Plane Protocol (TS 38.415) . 12
8.7 Summary of NG-RAN Xn interface Technical Specifications . 13
Annex A (informative): Change history . 14
History . 15
ETSI
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3GPP TS 38.420 version 15.1.0 Release 15 5 ETSI TS 138 420 V15.1.0 (2018-09)
Foreword
This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
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3GPP TS 38.420 version 15.1.0 Release 15 6 ETSI TS 138 420 V15.1.0 (2018-09)
1 Scope
The present document is an introduction to the TSG RAN TS 38.42x series of Technical Specifications that define the
Xn interface. It is an interface for the interconnection of two NG-RAN nodes within the NG-RAN architecture
(TS 38.401 [2]).
2 References
The following documents contain provisions which, through reference in this text, constitute pr
...