8 Other Xn interface specifications
38.4203GPPNG-RANRelease 17TSXn general aspects and principles
8.1 NG-RAN Xn interface: Xn layer 1 (TS 38.421)
TS 38.421 [3] specifies the physical layer technologies that may be used to support the Xn interface.
8.2 NG-RAN Xn interface: Xn signalling transport (TS 38.422)
TS 38.422 [4] specifies how the XnAP signalling messages are transported over Xn.
8.3 NG-RAN Xn interface: Xn application protocol (XnAP) (TS 38.423)
TS 38.423 [5] specifies the radio network layer signalling procedures of the control plane between NG-RAN nodes.
8.4 NG-RAN Xn interface: Xn data transport (TS 38.424)
TS 38.424 [6] specifies the standards for user data transport protocols over the NG-RAN Xn interface.
8.5 NG-RAN Xn interface: NR user plane protocol (TS 38.425)
TS 38.425 [7] specifies the user plane protocol procedures for dual connectivity over the NG-RAN Xn interface.
8.6 NG-RAN Xn interface: PDU Session User Plane Protocol (TS 38.415)
TS 38.415 [10] specifies the user plane protocol procedures for data forwarding using PDU Session tunnels over the NG-RAN Xn interface.
8.7 Summary of NG-RAN Xn interface Technical Specifications
The relationship between the technical specifications that define the NG-RAN Xn interface is shown in Figure 8.7-1.
Figure 8.7-1: Xn Interface Technical Specifications
Annex A (informative):
Change history
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Change history |
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Date |
Meeting |
TDoc |
CR |
Rev |
Cat |
Subject/Comment |
New version |
|
2017-04 |
R3#95b |
R3-171313 |
TS skeleton |
0.0.1 |
|||
|
2017-05 |
R3#96 |
R3-171807 |
Change of structure of clause 5 |
0.0.2 |
|||
|
2017-05 |
R3#96 |
R3-171967 |
Further skeleton change following agreements at R3#96 Initial text for clauses 4, 7 and 8 (R3-171966) Functions from R3-171927 Add change history |
0.1.0 |
|||
|
2017-07 |
R3 NR AH |
R3-172636 |
TP from R3-172596 |
0.2.0 |
|||
|
2017-09 |
R3#97 |
R3-173453 |
TPs from R3-173320 and R3-173321 |
0.3.0 |
|||
|
2017-10 |
R3#97bis |
R3-174241 |
TP from R3-173636 |
0.4.0 |
|||
|
2017-12 |
R3#98 |
R3-175057 |
TPs from R3-174451 and R3-174764 |
0.5.0 |
|||
|
2018-02 |
R3 NR AH 1801 |
R3-180653 |
TP from R3-180543 |
0.6.0 |
|||
|
2018-03 |
R3#99 |
R3-181590 |
TP from R3-181388 |
0.7.0 |
|||
|
2018-04 |
R3#99bis |
R3-182526 |
TP from R3-181866 |
0.8.0 |
|||
|
2018-06 |
R3#100 |
R3-183595 |
TPs from R3-183098, R3-182719 and R3-183375 |
0.9.0 |
|||
|
2018-06 |
RP#80 |
RP-180687 |
Presentation to RAN for one step approval |
1.0.0 |
|||
|
2018-06 |
RAN#80 |
– |
– |
– |
– |
Specification approved at TSG-RAN and placed under change control |
15.0.0 |
|
2018-09 |
RAN#81 |
RP-181922 |
0001 |
2 |
F |
NR Corrections (38.420 Baseline CR covering RAN3-101 agreements) |
15.1.0 |
|
2018-12 |
RAN#82 |
RP-182446 |
0004 |
1 |
F |
Rapporteur’s CR for TS 38.420 |
15.2.0 |
|
2018-12 |
RAN#82 |
RP-182447 |
0006 |
– |
B |
Introduction of Data Volume Reporting for MR-DC |
15.2.0 |
|
2018-12 |
RAN#82 |
RP-182447 |
0007 |
– |
F |
Rename the Data Forwarding Address Indication procedure |
15.2.0 |
|
2020-07 |
RAN#88-e |
RP-201075 |
0008 |
8 |
B |
Baseline CR for introducing Rel-16 NR mobility enhancement |
16.0.0 |
|
2020-07 |
RAN#88-e |
RP-201082 |
0018 |
3 |
B |
BLCR to 38.420: Addition of MDT feature |
16.0.0 |
|
2020-07 |
RAN#88-e |
RP-201082 |
0019 |
3 |
B |
BLCR to 38.420: Addition of SON feature |
16.0.0 |
|
2022-03 |
RAN#95-e |
RP-220222 |
0020 |
7 |
B |
CR on CP-UP separation for Rel-17 IAB |
17.0.0 |
|
2022-03 |
RAN#95-e |
RP-220224 |
0022 |
3 |
B |
BL CR to TS38.420 |
17.0.0 |
|
2022-03 |
RAN#95-e |
RP-220218 |
0023 |
2 |
B |
CPAC BL CR to TS 38.420 |
17.0.0 |
|
2022-03 |
RAN#95-e |
RP-220233 |
0024 |
2 |
B |
RA-SDT BLCR to TS 38.420 |
17.0.0 |
|
2022-03 |
RAN#95-e |
RP-220236 |
0025 |
1 |
B |
Addition of the Retrieve UE Context Confirm procedure [InterMNResume] |
17.0.0 |
|
2022-03 |
RAN#95-e |
RP-220229 |
0026 |
– |
B |
BLCR to 38.420: Support of QoE Measurement Collection for NR |
17.0.0 |
|
2022-06 |
RAN#96 |
RP-221141 |
0027 |
– |
F |
Alignment with rel-17 changes in XnAP |
17.1.0 |
|
2022-06 |
RAN#96 |
RP-221134 |
0028 |
1 |
F |
Alignment with rel-17 changes in XnAP |
17.1.0 |
|
2022-06 |
RAN#96 |
RP-221136 |
0029 |
– |
F |
Alignment with rel-17 changes in XnAP |
17.1.0 |
|
2022-06 |
RAN#96 |
RP-221128 |
0030 |
1 |
F |
IAB Rel-17 Corrections |
17.1.0 |
|
2022-06 |
RAN#96 |
RP-221143 |
0031 |
– |
F |
QoE Rel-17 Corrections |
17.1.0 |
|
2022-09 |
RAN#97-e |
RP-222183 |
0032 |
1 |
F |
Correction to 38.420 for IAB |
17.2.0 |