LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 general aspects and principles (3GPP TS 36.420 version 15.1.0 Release 15)

RTS/TSGR-0336420vf10

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Status
Published
Publication Date
22-Jul-2019
Current Stage
12 - Completion
Completion Date
23-Jul-2019
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ETSI TS 136 420 V15.1.0 (2019-07) - LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 general aspects and principles (3GPP TS 36.420 version 15.1.0 Release 15)
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ETSI TS 136 420 V15.1.0 (2019-07)
TECHNICAL SPECIFICATION
LTE;
Evolved Universal Terrestrial
Radio Access Network (E-UTRAN);
X2 general aspects and principles
(3GPP TS 36.420 version 15.1.0 Release 15)
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3GPP TS 36.420 version 15.1.0 Release 15 1 ETSI TS 136 420 V15.1.0 (2019-07)
Reference
RTS/TSGR-0336420vf10
Keywords
LTE
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3GPP TS 36.420 version 15.1.0 Release 15 2 ETSI TS 136 420 V15.1.0 (2019-07)
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ETSI
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3GPP TS 36.420 version 15.1.0 Release 15 3 ETSI TS 136 420 V15.1.0 (2019-07)
Contents

Intellectual Property Rights ................................................................................................................................ 2

Legal Notice ....................................................................................................................................................... 2

Modal verbs terminology .................................................................................................................................... 2

Foreword ............................................................................................................................................................. 5

1 Scope. ....................................................................................................................................................... 6

2 References ................................................................................................................................................ 6

3 Definitions, symbols and abbreviations ................................................................................................... 6

3.1 Definitions .......................................................................................................................................................... 6

3.2 Abbreviations ..................................................................................................................................................... 7

4 General aspects ......................................................................................................................................... 7

4.1 Introduction ........................................................................................................................................................ 7

4.2 X2 interface general principles ........................................................................................................................... 7

4.3 X2 interface specification objectives .................................................................................................................. 7

4.3.1 General .......................................................................................................................................................... 7

4.3.2 Addressing of eNBs over the X2 interface ................................................................................................... 7

4.4 X2 interface capabilities ..................................................................................................................................... 8

4.4.1 Radio application related signalling .............................................................................................................. 8

4.4.2 X2 tunnels ..................................................................................................................................................... 8

4.5 X2 interface characteristics ................................................................................................................................ 8

4.5.1 Uses of SCTP ................................................................................................................................................ 8

4.5.1.1 General .................................................................................................................................................... 8

5 Functions of the X2 interface ................................................................................................................... 8

5.1 Function list ........................................................................................................................................................ 8

5.2 Function description ..................................................................................................................................... 9

5.2.1 Intra LTE-Access-System mobility support for ECM-CONNECTED UE ................................................... 9

5.2.1.1 Context transfer from source eNB to target eNB .................................................................................... 9

5.2.1.2 Control of user plane transport bearers between source eNB and target eNB ........................................ 9

5.2.1.3 Handover cancellation ............................................................................................................................. 9

5.2.1.4 UE context release in source eNB ........................................................................................................... 9

5.2.1.5 Dual Connectivity ................................................................................................................................... 9

5.2.1.6 EN-DC .................................................................................................................................................... 9

5.2.2 Load management ......................................................................................................................................... 9

5.2.3 Inter-cell interference coordination ............................................................................................................. 10

5.2.3.1 Uplink interference load management .................................................................................................. 10

5.2.3.2 Downlink interference avoidance .......................................................................................................... 10

5.2.4 General X2 management and error handling functions .............................................................................. 10

5.2.4.1 Error indication ..................................................................................................................................... 10

5.2.4.2 Reset ...................................................................................................................................................... 10

5.2.5 Trace functions ........................................................................................................................................... 10

5.2.6 Application level data exchange between eNBs ......................................................................................... 10

5.2.7 Data exchange for self-optimisation ........................................................................................................... 10

6 X2 interface protocols and protocol structure ........................................................................................ 10

6.1 General ............................................................................................................................................................. 10

6.2 Radio signalling protocols ................................................................................................................................ 11

6.2.1 X2AP protocol ............................................................................................................................................ 11

6.3 User plane protocol .......................................................................................................................................... 11

6.3.1 Tunnelling protocol GTP-U ........................................................................................................................ 11

6.4 X2 interface protocol structure ......................................................................................................................... 11

7 Other X2 interface specifications ........................................................................................................... 12

7.1 E-UTRAN X2 interface: X2 layer 1 (TS 36.421)............................................................................................. 12

7.2 E-UTRAN X2 interface: X2 signaling transport (TS 36.422) ......................................................................... 12

7.3 E-UTRAN X2 interface: X2 application protocol (X2AP) (TS 36.423) .......................................................... 12

ETSI
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3GPP TS 36.420 version 15.1.0 Release 15 4 ETSI TS 136 420 V15.1.0 (2019-07)

7.4 E-UTRAN X2 interface: X2 data transport (TS 36.424) .................................................................................. 12

7.5 Summary of E-UTRAN X2 interface Technical Specifications ....................................................................... 12

Annex A (informative): Change history ............................................................................................... 14

History .............................................................................................................................................................. 15

ETSI
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3GPP TS 36.420 version 15.1.0 Release 15 5 ETSI TS 136 420 V15.1.0 (2019-07)
Foreword

This Technical Specification has been produced by the 3 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 36.420 version 15.1.0 Release 15 6 ETSI TS 136 420 V15.1.0 (2019-07)
1 Scope.

The present document is an introduction to the TSG RAN TS 36.42x series of UMTS Technical Specifications that

define the X2 interface. It is an interface for the interconnection of two E-UTRAN NodeB (eNB) components and an E-

UTRAN NodeB (eNB) and an E-UTRAN gNodeB (en-gNB) within the Evolved Universal Terrestrial Radio Access

Network (E-UTRAN) architecture (TS 36.401 [2]).
2 References

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

...

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