5G学习笔记之NGAP

参考资料：3Gpp 38.413

1. NGAP服务

NGAP提供NG-RAN节点与AMF节点之间的信令服务。服务分为两类：

• 非UE相关服务：在NG-RAN与AMF之间建立NG接口实例。
• UE相关服务：为UE接入核心网提供信令和数据连接。
   

2. NGAP一般过程分类

（1）NGAP一般过程按是否有响应，可分为两类：

• Class 1：应答类消息，需要等待响应消息。

一般过程	发起消息	成功响应	失败响应
AMF Configuration Update	AMF CONFIGURATION UPDATE	AMF CONFIGURATION UPDATE ACKNOWLEDGE	AMF CONFIGURATION UPDATE FAILURE
RAN Configuration Update	RAN CONFIGURATION UPDATE	RAN CONFIGURATION UPDATE ACKNOWLEDGE	RAN CONFIGURATION UPDATE FAILURE
Handover Cancellation	HANDOVER CANCEL	HANDOVER CANCEL ACKNOWLEDGE
Handover Preparation	HANDOVER REQUIRED	HANDOVER COMMAND	HANDOVER PREPARATION FAILURE
Handover Resource Allocation	HANDOVER REQUEST	HANDOVER REQUEST ACKNOWLEDGE	HANDOVER FAILURE
Initial Context Setup	INITIAL CONTEXT SETUP REQUEST	INITIAL CONTEXT SETUP RESPONSE	INITIAL CONTEXT SETUP FAILURE
UE Context Modification	UE CONTEXT MODIFICATION REQUEST	UE CONTEXT MODIFICATION RESPONSE	UE CONTEXT MODIFICATION FAILURE
UE Context Release	UE CONTEXT RELEASE COMMAND	UE CONTEXT RELEASE COMPLETE
Path Switch Request	PATH SWITCH REQUEST	PATH SWITCH REQUEST ACKNOWLEDGE	PATH SWITCH REQUEST FAILURE
PDU Session Resource Setup	PDU SESSION RESOURCE SETUP REQUEST	PDU SESSION RESOURCE SETUP RESPONSE
PDU Session Resource Release	PDU SESSION RESOURCE RELEASE COMMAND	PDU SESSION RESOURCE RELEASE RESPONSE
PDU Session Resource Modify	PDU SESSION RESOURCE MODIFY REQUEST	PDU SESSION RESOURCE MODIFY RESPONSE
PDU Session Resource Modify Indication	PDU SESSION RESOURCE MODIFY INDICATION	PDU SESSION RESOURCE MODIFY CONFIRM
UE Radio Capability Check	UE RADIO CAPABILITY CHECK REQUEST	UE RADIO CAPABILITY CHECK RESPONSE
Write-Replace Warning	WRITE-REPLACE WARNING REQUEST	WRITE-REPLACE WARNING RESPONSE
PWS Cancel	PWS CANCEL REQUEST	PWS CANCEL RESPONSE
NG Reset	NG RESET	NG RESET ACKNOWLEDGE
NG Setup	NG SETUP REQUEST	NG SETUP RESPONSE	NG SETUP FAILURE

• Class 2：通知类消息，无response消息。

一般过程	消息
Downlink RAN Configuration Transfer	DOWNLINK RAN CONFIGURATION TRANSFER
Uplink RAN Configuration Transfer	UPLINK RAN CONFIGURATION TRANSFER
Downlink RAN Status Transfer	DOWNLINK RAN STATUS TRANSFER
Uplink RAN Status Transfer	UPLINK RAN STATUS TRANSFER
Downlink NAS Transport	DOWNLINK NAS TRANSPORT
Uplink NAS Transport	UPLINK NAS TRANSPORT
Downlink UE Associated NRPPa Transport	DOWNLINK UE ASSOCIATED NRPPA TRANSPORT
Uplink UE Associated NRPPa Transport	UPLINK UE ASSOCIATED NRPPA TRANSPORT
Downlink Non UE Associated NRPPa Transport	DOWNLINK NON UE ASSOCIATED NRPPA TRANSPORT
Uplink Non UE Associated NRPPa Transport	UPLINK NON UE ASSOCIATED NRPPA TRANSPORT
Handover Notification	HANDOVER NOTIFY
Initial UE Message	INITIAL UE MESSAGE
NAS Non Delivery Indication	NAS NON DELIVERY INDICATION
Error Indication	ERROR INDICATION
Paging	PAGING
PDU Session Resource Notify	PDU SESSION RESOURCE NOTIFY
Reroute NAS Request	REROUTE NAS REQUEST
UE Context Release Request	UE CONTEXT RELEASE REQUEST
AMF Status Indication	AMF STATUS INDICATION
PWS Restart Indication	PWS RESTART INDICATION
PWS Failure Indication	PWS FAILURE INDICATION
Trace Start	TRACE START
Trace Failure Indication	TRACE FAILURE INDICATION
Deactivate Trace	DEACTIVATE TRACE
Cell Traffic Trace	CELL TRAFFIC TRACE
Location Reporting Control	LOCATION REPORTING CONTROL
Location Reporting Failure Indication	LOCATION REPORTING FAILURE INDICATION
Location Report	LOCATION REPORT
UE TNLA Binding Release	UE TNLA BINDING RELEASE REQUEST
UE Radio Capability Info Indication	UE RADIO CAPABILITY INFO INDICATION
RRC Inactive Transition Report	RRC INACTIVE TRANSITION REPORT
Overload Start	OVERLOAD START
Overload Stop	OVERLOAD STOP
Secondary RAT Data Usage Report	SECONDARY RAT DATA USAGE REPORT

（2）NGAP一般过程按功能分类，大致可以分为以下14类：

功能	过程
接口管理过程	NG Setup RAN Configuration Update AMF Configuration Update NG Reset Error Indication Overload Start Overload Stop AMF Status Indication
寻呼过程	Paging
UE上下文管理过程	Initial Context Setup UE Context Release Request (NG-RAN initiated) UE Context Release Request (AMF initiated) UE Context Modification RRC Inactive Transition Report
UE移动性管理过程	Handover Preparation Handover Resource Allocation Handover Notification Path Switch Request Handover Cancellation Uplink RAN Status Transfer Downlink RAN Status Transfer
UE无线能力管理过程	UE Radio Capability Info Indication UE Radio Capability Check
PDU会话管理过程	PDU Session Resource Setup PDU Session Resource Release PDU Session Resource Modify PDU Session Resource Notify PDU Session Resource Modify Indication
NAS消息传输过程	Initial UE Message Downlink NAS Transport Uplink NAS Transport NAS Non Delivery Indication Reroute NAS Request
配置传输过程	Uplink RAN Configuration Transfer Downlink RAN Configuration Transfer
告警消息传输过程	Write-Replace Warning
NRPPa传输过程	DOWNLINK UE ASSOCIATED NRPPA TRANSPORT DOWNLINK NON UE ASSOCIATED NRPPA TRANSPORT UPLINK UE ASSOCIATED NRPPA TRANSPORT UPLINK NON UE ASSOCIATED NRPPA TRANSPORT
跟踪过程	Trace Start Trace Failure Indication Deactivate Trace Deactivate Trace Cell Traffic Trace
位置报告过程	Location Reporting Control Location Reporting Failure Indication Location Report
UE TNLA绑定过程	UE TNLA Binding Release
数据使用率报告过程	Secondary RAT Data Usage Report

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