5G; NG-RAN; Xn Application Protocol (XnAP) (3GPP TS 38.423 version 15.7.0 Release 15)

RTS/TSGR-0338423vf70

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Status
Published
Publication Date
07-Apr-2020
Current Stage
12 - Completion
Completion Date
08-Apr-2020
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ETSI TS 138 423 V15.7.0 (2020-04) - 5G; NG-RAN; Xn Application Protocol (XnAP) (3GPP TS 38.423 version 15.7.0 Release 15)
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ETSI TS 138 423 V15.7.0 (2020-04)
TECHNICAL SPECIFICATION
5G;
NG-RAN;
Xn Application Protocol (XnAP)
(3GPP TS 38.423 version 15.7.0 Release 15)
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3GPP TS 38.423 version 15.7.0 Release 15 1 ETSI TS 138 423 V15.7.0 (2020-04)
Reference
RTS/TSGR-0338423vf70
Keywords
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3GPP TS 38.423 version 15.7.0 Release 15 2 ETSI TS 138 423 V15.7.0 (2020-04)
Intellectual Property Rights
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ETSI
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3GPP TS 38.423 version 15.7.0 Release 15 3 ETSI TS 138 423 V15.7.0 (2020-04)
Contents

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

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

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

Foreword ........................................................................................................................................................... 10

1 Scope ...................................................................................................................................................... 11

2 References .............................................................................................................................................. 11

3 Definitions, symbols and abbreviations ................................................................................................. 12

3.1 Definitions ........................................................................................................................................................ 12

3.2 Abbreviations ................................................................................................................................................... 13

4 General ................................................................................................................................................... 13

4.1 Procedure specification principles .................................................................................................................... 13

4.2 Forwards and backwards compatibility ............................................................................................................ 14

4.3 Specification notations ..................................................................................................................................... 14

5 XnAP services ........................................................................................................................................ 14

5.1 XnAP procedure modules ................................................................................................................................ 14

5.2 Parallel transactions .......................................................................................................................................... 14

6 Services expected from signalling transport ........................................................................................... 14

7 Functions of XnAP ................................................................................................................................. 15

8 XnAP procedures ................................................................................................................................... 15

8.1 Elementary procedures ..................................................................................................................................... 15

8.2 Basic mobility procedures ................................................................................................................................ 17

8.2.1 Handover Preparation ................................................................................................................................. 17

8.2.1.1 General .................................................................................................................................................. 17

8.2.1.2 Successful Operation ............................................................................................................................. 17

8.2.1.3 Unsuccessful Operation ........................................................................................................................ 20

8.2.1.4 Abnormal Conditions ............................................................................................................................ 20

8.2.2 SN Status Transfer ...................................................................................................................................... 20

8.2.2.1 General .................................................................................................................................................. 20

8.2.2.2 Successful Operation ............................................................................................................................. 21

8.2.2.3 Unsuccessful Operation ........................................................................................................................ 21

8.2.2.4 Abnormal Conditions ............................................................................................................................ 21

8.2.3 Handover Cancel ........................................................................................................................................ 22

8.2.3.1 General .................................................................................................................................................. 22

8.2.3.2 Successful Operation ............................................................................................................................. 22

8.2.3.3 Unsuccessful Operation ........................................................................................................................ 22

8.2.3.4 Abnormal Conditions ............................................................................................................................ 22

8.2.4 Retrieve UE Context ................................................................................................................................... 22

8.2.4.1 General .................................................................................................................................................. 22

8.2.4.2 Successful Operation ............................................................................................................................. 23

8.2.4.3 Unsuccessful Operation ........................................................................................................................ 23

8.2.4.4 Abnormal Conditions ............................................................................................................................ 24

8.2.5 RAN Paging ................................................................................................................................................ 24

8.2.5.1 General .................................................................................................................................................. 24

8.2.5.2 Successful operation.............................................................................................................................. 24

8.2.5.3 Unsuccessful Operation ........................................................................................................................ 24

8.2.5.4 Abnormal Condition.............................................................................................................................. 24

8.2.6 XN-U Address Indication ........................................................................................................................... 24

8.2.6.1 General .................................................................................................................................................. 24

8.2.6.2 Successful Operation ............................................................................................................................. 25

8.2.6.3 Unsuccessful Operation ........................................................................................................................ 25

8.2.6.4 Abnormal Conditions ............................................................................................................................ 25

ETSI
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3GPP TS 38.423 version 15.7.0 Release 15 4 ETSI TS 138 423 V15.7.0 (2020-04)

8.2.7 UE Context Release .................................................................................................................................... 26

8.2.7.1 General .................................................................................................................................................. 26

8.2.7.2 Successful Operation ............................................................................................................................. 26

8.2.7.3 Unsuccessful Operation ........................................................................................................................ 27

8.2.7.4 Abnormal Conditions ............................................................................................................................ 27

8.3 Procedures for Dual Connectivity .................................................................................................................... 27

8.3.1 S-NG-RAN node Addition Preparation ...................................................................................................... 27

8.3.1.1 General .................................................................................................................................................. 27

8.3.1.2 Successful Operation ............................................................................................................................. 28

8.3.1.3 Unsuccessful Operation ........................................................................................................................ 31

8.3.1.4 Abnormal Conditions ............................................................................................................................ 31

8.3.2 S-NG-RAN node Reconfiguration Completion .......................................................................................... 32

8.3.2.1 General .................................................................................................................................................. 32

8.3.2.2 Successful Operation ............................................................................................................................. 32

8.3.2.3 Abnormal Conditions ............................................................................................................................ 32

8.3.3 M-NG-RAN node initiated S-NG-RAN node Modification Preparation ................................................... 32

8.3.3.1 General .................................................................................................................................................. 32

8.3.3.2 Successful Operation ............................................................................................................................. 33

8.3.3.3 Unsuccessful Operation ........................................................................................................................ 38

8.3.3.4 Abnormal Conditions ............................................................................................................................ 38

8.3.4 S-NG-RAN node initiated S-NG-RAN node Modification ........................................................................ 39

8.3.4.1 General .................................................................................................................................................. 39

8.3.4.2 Successful Operation ............................................................................................................................. 39

8.3.4.3 Unsuccessful Operation ........................................................................................................................ 41

8.3.4.4 Abnormal Conditions ............................................................................................................................ 42

8.3.5 S-NG-RAN node initiated S-NG-RAN node Change ................................................................................. 42

8.3.5.1 General .................................................................................................................................................. 42

8.3.5.2 Successful Operation ............................................................................................................................. 43

8.3.5.3 Unsuccessful Operation ........................................................................................................................ 43

8.3.5.4 Abnormal Conditions ............................................................................................................................ 43

8.3.6 M-NG-RAN node initiated S-NG-RAN node Release ............................................................................... 44

8.3.6.1 General .................................................................................................................................................. 44

8.3.6.2 Successful Operation ............................................................................................................................. 44

8.3.6.3 Unsuccessful Operation ........................................................................................................................ 45

8.3.6.4 Abnormal Conditions ............................................................................................................................ 45

8.3.7 S-NG-RAN node initiated S-NG-RAN node Release ................................................................................ 45

8.3.7.1 General .................................................................................................................................................. 45

8.3.7.2 Successful Operation ............................................................................................................................. 46

8.3.7.3 Unsuccessful Operation ........................................................................................................................ 46

8.3.7.4 Abnormal Conditions ............................................................................................................................ 46

8.3.8 S-NG-RAN node Counter Check ................................................................................................................ 46

8.3.8.1 General .................................................................................................................................................. 46

8.3.8.2 Successful Operation ............................................................................................................................. 47

8.3.8.3 Unsuccessful Operation ........................................................................................................................ 47

8.3.8.4 Abnormal Conditions ............................................................................................................................ 47

8.3.9 RRC Transfer .............................................................................................................................................. 47

8.3.9.1 General .................................................................................................................................................. 47

8.3.9.2 Successful Operation ............................................................................................................................. 48

8.3.9.3 Unsuccessful Operation ........................................................................................................................ 48

8.3.9.4 Abnormal Conditions ............................................................................................................................ 48

8.3.10 Notification Control Indication ................................................................................................................... 48

8.3.10.1 General .................................................................................................................................................. 48

8.3.10.2 Successful Operation – M-NG-RAN node initiated .............................................................................. 49

8.3.10.3 Successful Operation – S-NG-RAN node initiated ............................................................................... 49

8.3.10.4 Abnormal Conditions ............................................................................................................................ 49

8.3.11 Activity Notification ................................................................................................................................... 49

8.3.11.1 General .................................................................................................................................................. 49

8.3.11.2 Successful Operation ............................................................................................................................. 50

8.3.11.3 Abnormal Conditions ............................................................................................................................ 50

8.3.12 E-UTRA – NR Cell Resource Coordination ............................................................................................... 50

8.3.12.1 General .................................................................................................................................................. 50

8.3.12.2 Successful Operation ............................................................................................................................. 51

ETSI
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3GPP TS 38.423 version 15.7.0 Release 15 5 ETSI TS 138 423 V15.7.0 (2020-04)

8.3.13 Secondary RAT Data Usage Report ........................................................................................................... 52

8.3.13.1 General .................................................................................................................................................. 52

8.3.13.2 Successful Operation ............................................................................................................................. 52

8.3.13.3 Unsuccessful Operation ........................................................................................................................ 52

8.3.13.4 Abnormal Conditions ............................................................................................................................ 52

8.4 Global procedures............................................................................................................................................. 52

8.4.1 Xn Setup ..................................................................................................................................................... 52

8.4.1.1 General .................................................................................................................................................. 52

8.4.1.2 Successful Operation ............................................................................................................................. 53

8.4.1.3 Unsuccessful Operation ........................................................................................................................ 54

8.4.1.4 Abnormal Conditions ............................................................................................................................ 54

8.4.2 NG-RAN node Configuration Update ........................................................................................................ 54

8.4.2.1 General .................................................................................................................................................. 54

8.4.2.2 Successful Operation ............................................................................................................................. 55

8.4.2.3 Unsuccessful Operation ........................................................................................................................ 57

8.4.2.4 Abnormal Conditions ............................................................................................................................ 57

8.4.3 Cell Activation ............................................................................................................................................ 57

8.4.3.1 General .................................................................................................................................................. 57

8.4.3.2 Successful Operation ............................................................................................................................. 57

8.4.3.3 Unsuccessful Operation ........................................................................................................................ 58

8.4.3.4 Abnormal Conditions ............................................................................................................................ 58

8.4.4 Reset ........................................................................................................................................................... 58

8.4.4.1 General .................................................................................................................................................. 58

8.4.4.2 Successful Operation ............................................................................................................................. 59

8.4.4.3 Unsuccessful Operation ........................................................................................................................ 59

8.4.4.4 Abnormal Conditions ............................................................................................................................ 59

8.4.5 Error Indication ........................................................................................................................................... 60

8.4.5.1 General .................................................................................................................................................. 60

8.4.5.2 Successful Operation ............................................................................................................................. 60

8.4.5.3 Unsuccessful Operation ........................................................................................................................ 60

8.4.5.4 Abnormal Conditions ............................................................................................................................ 60

8.4.6 Xn Removal ................................................................................................................................................ 60

8.4.6.1 General .................................................................................................................................................. 60

8.4.6.2 Successful Operation ............................................................................................................................. 61

8.4.6.3 Unsuccessful Operation ........................................................................................................................ 61

8.4.6.4 Abnormal Conditions ............................................................................................................................ 61

9 Elements for XnAP Communication ...................................................................................................... 62

9.0 General ............................................................................................................................................................. 62

9.1 Message Functional Definition and Content .................................................................................................... 62

9.1.1 Messages for Basic Mobility Procedures .................................................................................................... 62

9.1.1.1 HANDOVER REQUEST ..................................................................................................................... 62

9.1.1.2 HANDOVER REQUEST ACKNOWLEDGE...................................................................................... 64

9.1.1.3 HANDOVER PREPARATION FAILURE .......................................................................................... 65

9.1.1.4 SN STATUS TRANSFER .................................................................................................................... 65

...

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