8.1 Elementary procedures

38.4233GPPNG-RANRelease 17TSXn Application Protocol (XnAP)

In the following tables, all EPs are divided into Class 1 and Class 2 EPs.

Table 8.1-1: Class 1 Elementary Procedures

Elementary Procedure

Initiating Message

Successful Outcome

Unsuccessful Outcome

Response message

Response message

Handover Preparation

HANDOVER REQUEST

HANDOVER REQUEST ACKNOWLEDGE

HANDOVER PREPARATION FAILURE

Retrieve UE Context

RETRIEVE UE CONTEXT REQUEST

RETRIEVE UE CONTEXT RESPONSE

RETRIEVE UE CONTEXT FAILURE

S-NG-RAN node Addition Preparation

S-NODE ADDITION REQUEST

S-NODE ADDITION REQUEST ACKNOWLEDGE

S-NODE ADDITION REQUEST REJECT

M-NG-RAN node initiated S-NG-RAN node Modification Preparation

S-NODE MODIFICATION REQUEST

S-NODE MODIFICATION REQUEST ACKNOWLEDGE

S-NODE MODIFICATION REQUEST REJECT

S-NG-RAN node initiated S-NG-RAN node Modification

S-NODE MODIFICATION REQUIRED

S-NODE MODIFICATION CONFIRM

S-NODE MODIFICATION REFUSE

S-NG-RAN node initiated S-NG-RAN node CHANGE

S-NODE CHANGE REQUIRED

S-NODE CHANGE CONFIRM

S-NODE CHANGE REFUSE

M-NG-RAN node initiated S-NG-RAN node Release

S-NODE RELEASE REQUEST

S-NODE RELEASE REQUEST ACKNOWLEDGE

S-NODE RELEASE REJECT

S-NG-RAN node initiated S-NG-RAN node Release

S-NODE RELEASE REQUIRED

S-NODE RELEASE CONFIRM

Xn Setup

XN SETUP REQUEST

XN SETUP RESPONSE

XN SETUP FAILURE

NG-RAN node Configuration Update

NG-RAN NODE CONFIGURATION UPDATE

NG-RAN NODE CONFIGURATION UPDATE ACKNOWLEDGE

NG-RAN NODE CONFIGURATION UPDATE FAILURE

Cell Activation

CELL ACTIVATION REQUEST

CELL ACTIVATION RESPONSE

CELL ACTIVATION FAILURE

Reset

RESET REQUEST

RESET RESPONSE

Xn Removal

Xn REMOVAL REQUEST

Xn REMOVAL RESPONSE

Xn REMOVAL FAILURE

E-UTRA – NR Cell Resource Coordination

E-UTRA – NR CELL RESOURCE COORDINATION REQUEST

E-UTRA – NR CELL RESOURCE COORDINATION RESPONSE

Resource Status Reporting Initiation

RESOURCE STATUS REQUEST

RESOURCE STATUS RESPONSE

RESOURCE STATUS FAILURE

Mobility Settings Change

MOBILITY CHANGE REQUEST

MOBILITY CHANGE ACKNOWLEDGE

MOBILITY CHANGE FAILURE

IAB Transport Migration Management

IAB TRANSPORT MIGRATION MANAGEMENT REQUEST

IAB TRANSPORT MIGRATION MANAGEMENT RESPONSE

IAB TRANSPORT MIGRATION MANAGEMENT REJECT

IAB Transport Migration Modification

IAB TRANSPORT MIGRATION MODIFICATION REQUEST

IAB TRANSPORT MIGRATION MODIFICATION RESPONSE

IAB Resource Coordination

IAB RESOURCE COORDINATION REQUEST

IAB RESOURCE COORDINATION RESPONSE

Partial UE Context Transfer

PARTIAL UE CONTEXT TRANSFER

PARTIAL UE CONTEXT TRANSFER ACKNOWLEDGE

PARTIAL UE CONTEXT TRANSFER FAILURE

Table 8.1-2: Class 2 Elementary Procedures

Elementary Procedure

Initiating Message

Handover Cancel

HANDOVER CANCEL

SN Status Transfer

SN STATUS TRANSFER

RAN Paging

RAN PAGING

Xn-U Address Indication

XN-U ADDRESS INDICATION

S-NG-RAN node Reconfiguration Completion

S-NODE RECONFIGURATION COMPLETE

S-NG-RAN node Counter Check

S-NODE COUNTER CHECK REQUEST

UE Context Release

UE CONTEXT RELEASE

RRC Transfer

RRC TRANSFER

Error Indication

ERROR INDICATION

Notification Control Indication

NOTIFICATION CONTROL INDICATION

Activity Notification

ACTIVITY NOTIFICATION

Secondary RAT Data Usage Report

SECONDARY RAT DATA USAGE REPORT

Trace Start

TRACE START

Deactivate Trace

DEACTIVATE TRACE

Handover Success

HANDOVER SUCCESS

Conditional Handover Cancel

CONDITIONAL HANDOVER CANCEL

Early Status Transfer

EARLY STATUS TRANSFER

Failure Indication

FAILURE INDICATION

Handover Report

HANDOVER REPORT

Resource Status Reporting

RESOURCE STATUS UPDATE

Access And Mobility Indication

ACCESS AND MOBILITY INDICATION

Cell Traffic Trace

CELL TRAFFIC TRACE

RAN Multicast Group Paging

RAN MULTICAST GROUP PAGING

SCG Failure Information Report

SCG FAILURE INFORMATION REPORT

SCG Failure Transfer

SCG FAILURE TRANSFER

F1-C Traffic Transfer

F1-C TRAFFIC TRANSFER

Retrieve UE Context Confirm

RETRIEVE UE CONTEXT CONFIRM

Conditional PSCell Change Cancel

CONDITIONAL PSCELL CHANGE CANCEL