8 Other Xn interface specifications

38.4203GPPNG-RANRelease 16TSXn 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

Change history

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