5G学习笔记之F1AP

参考资料:3Gpp 38.473
我就是个协议的搬运工~~~
1. F1AP服务

F1AP提供gNB-CU节点与gNB-DU节点之间的信令服务。服务分为两类:

  • 非UE相关服务:在gNB-CU与gNB-DU之间建立F1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. F1AP一般过程分类

(1)F1AP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
F1 Setup F1 SETUP REQUEST F1 SETUP RESPONSE F1 SETUP FAILURE
Reset RESET RESET ACKNOWLEDGE
gNB-DU Configuration Update GNB-DU CONFIGURATION UPDATE GNB-DU CONFIGURATION UPDATE ACKNOWLEDGE GNB-DU CONFIGURATION UPDATE FAILURE
gNB-CU Configuration Update GNB-CU CONFIGURATION UPDATE GNB-CU CONFIGURATION UPDATE ACKNOWLEDGE GNB-CU CONFIGURATION UPDATE FAILURE
UE Context Setup UE CONTEXT SETUP REQUEST UE CONTEXT SETUP RESPONSE UE CONTEXT SETUP FAILURE
UE Context Release (gNB-CU initiated) UE CONTEXT RELEASE COMMAND UE CONTEXT RELEASE COMPLETE
UE Context Modification (gNB-CU initiated) UE CONTEXT MODIFICATION REQUEST UE CONTEXT MODIFICATION RESPONSE UE CONTEXT MODIFICATION FAILURE
UE Context Modification Required (gNB-DU initiated) UE CONTEXT MODIFICATION REQUIRED UE CONTEXT MODIFICATION CONFIRM UE CONTEXT MODIFICATION REFUSE
Write-Replace Warning WRITE-REPLACE WARNING REQUEST WRITE-REPLACE WARNING RESPONSE
PWS Cancel PWS CANCEL REQUEST PWS CANCEL RESPONSE
GNB-DU RESOURCE COORDINATION GNB-DU RESOURCE COORDINATION REQUEST GNB-DU RESOURCE COORDINATION RESPONSE
  • Class 2:通知类消息,无响应消息。
一般过程 消息 作用
UE Context Release Request (gNB-DU initiated) UE CONTEXT RELEASE REQUEST
Initial UL RRC Message Transfer INITIAL UL RRC MESSAGE TRANSFER
DL RRC Message Transfer DL RRC MESSAGE TRANSFER
UL RRC Message Transfer UL RRC MESSAGE TRANSFER
UE Inactivity Notification UE INACTIVITY NOTIFICATION
System Information Delivery SYSTEM INFORMATION DELIVERY COMMAND
Paging PAGING
Notify NOTIFY
Error Indication ERROR INDICATION
PWS Restart Indication PWS RESTART INDICATION
PWS Failure Indication PWS FAILURE INDICATION
gNB-DU Status Indication GNB-DU STATUS INDICATION
RRC Delivery Report RRC DELIVERY REPORT

(2)F1AP一般过程按功能分类,大致可以分为以下6类:

功能 过程
接口管理 Reset
F1 Setup
Error Indication
gNB-DU Configuration Update
gNB-CU Configuration Update
gNB-DU Resource Coordination
gNB-DU Status Indication
UE上下文管理 UE Context Setup
UE Context Release Request (gNB-DU initiated)
UE Context Release (gNB-CU initiated)
UE Context Modification (gNB-CU initiated)
UE Context Modification Required (gNB-DU initiated)
UE Inactivity Notification
Notify
RRC消息转发 Initial UL RRC Message Transfer
DL RRC Message Transfer
UL RRC Message Transfer
RRC Delivery Report
告警消息 Write-Replace Warning
PWS Cancel
PWS Restart Indication
PWS Failure Indication
系统消息 System Information Delivery
寻呼 Paging

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