基本流程(EP):
NGAP协议由一些基本流程组成。以个基本流程是NG-RAN和AMF间的交互单元。
具有独立性和灵活性。
EP的消息构成类型:
Class1:应答类消息,有request和response过程,response会响应success或failure
Class2:通知类消息,发送notify,不用等response
Class1类response种类:
- Successful,信令消息明确表明EP成功完成,
- Unsuccessful,信令消息表明EP失败,
- Successful & Unsuccessful,信令消息中同时带有成功和失败结果。
Class2类消息则认为一直是成功的。
NGAP提供UE相关和非UE相关服务:
- 非UE相关服务,在NG-RAN和AMF间建立NG口实例。
- UE相关服务,为UE接入核心网提供信令和数据连接。
NGAP基本流程(EP)列表
Table 8.1-1: Class 1 procedures
Elementary Procedure |
Initiating Message |
Successful Outcome |
Unsuccessful Outcome |
Response message |
Response message |
||
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 |
NG Reset |
NG RESET |
NG RESET ACKNOWLEDGE |
|
NG Setup |
NG SETUP REQUEST |
NG SETUP RESPONSE |
NG SETUP FAILURE |
Path Switch Request |
PATH SWITCH REQUEST |
PATH SWITCH REQUEST ACKNOWLEDGE |
PATH SWITCH REQUEST FAILURE |
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 |
|
PDU Session Resource Release |
PDU SESSION RESOURCE RELEASE COMMAND |
PDU SESSION RESOURCE RELEASE RESPONSE |
|
PDU Session Resource Setup |
PDU SESSION RESOURCE SETUP REQUEST |
PDU SESSION RESOURCE SETUP RESPONSE |
|
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 |
|
Write-Replace Warning |
WRITE-REPLACE WARNING REQUEST |
WRITE-REPLACE WARNING RESPONSE |
|
PWS Cancel |
PWS CANCEL REQUEST |
PWS CANCEL RESPONSE |
|
UE Radio Capability Check |
UE RADIO CAPABILITY CHECK REQUEST |
UE RADIO CAPABILITY CHECK RESPONSE |
|
Table 8.1-2: Class 2 procedures
Elementary Procedure |
Message |
Downlink RAN Configuration Transfer |
DOWNLINK RAN CONFIGURATION TRANSFER |
Downlink RAN Status Transfer |
DOWNLINK RAN STATUS TRANSFER |
Downlink NAS Transport |
DOWNLINK NAS TRANSPORT |
Error Indication |
ERROR INDICATION |
Uplink RAN Configuration Transfer |
UPLINK RAN CONFIGURATION TRANSFER |
Uplink RAN Status Transfer |
UPLINK RAN STATUS TRANSFER |
Handover Notification |
HANDOVER NOTIFY |
Initial UE Message |
INITIAL UE MESSAGE |
NAS Non Delivery Indication |
NAS NON DELIVERY 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 |
Uplink NAS Transport |
UPLINK NAS TRANSPORT |
AMF Status Indication |
AMF STATUS INDICATION |
PWS Restart Indication |
PWS RESTART INDICATION |
PWS Failure Indication |
PWS FAILURE INDICATION |
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 |
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 Capability Info Indication |
UE CAPABILITY INFO INDICATION |