5G学习笔记之E1AP

参考资料:3GPP 38.463
gNB-CU:gNB Central Unit,一个逻辑节点,承载gNB的RRC、SDAP、PDCP协议,或en-gNB的RRC和PDCP协议。
gNB-DU:gNB Distributed Unit ,一个逻辑节点,承载gNB或en-gNB的RLC、MAC和PHY。
gNB-CU-CP:gNB-CU-Control Plane,一个逻辑节点,承载gNB或en-gNB的RRC以及PDCP控制面。
gNB-CU-UP:gNB-CU-User Plane,一个逻辑节点,承载en-gNB的PDCP用户面,或gNB的PDCP用户面和SDAP。
1. E1AP服务

E1AP提供gNB-CU-CP节点与gNB-CU-UP节点之间的信令服务。服务分为两类:

  • 非UE相关服务:在gNB-CU-CP与gNB-CU-UP之间建立E1AP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. E1AP一般过程分类

(1)E1AP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。若在规定的时间内未等到相应的消息,认为失败。
一般过程 发起消息 成功响应 失败响应
gNB-CU-UP E1 Setup GNB-CU-UP E1 SETUP REQUEST GNB-CU-UP E1 SETUP RESPONSE GNB-CU-UP E1 SETUP FAILURE
gNB-CU-CP E1 Setup GNB-CU-CP E1 SETUP REQUEST GNB-CU-CP E1 SETUP RESPONSE GNB-CU-CP E1 SETUP FAILURE
gNB-CU-UP Configuration Update GNB-CU-UP CONFIGURATION UPDATE GNB-CU-UP CONFIGURATION UPDATE ACKNOWLEDGE GNB-CU-UP CONFIGURATION UPDATE FAILURE
gNB-CU-CP Configuration Update GNB-CU-CP CONFIGURATION UPDATE GNB-CU-CP CONFIGURATION UPDATE ACKNOWLEDGE GNB-CU-CP CONFIGURATION UPDATE FAILURE
E1 Release E1 RELEASE REQUEST E1 RELEASE RESPONSE
Reset RESET RESET ACKNOWLEDGE
Bearer Context Setup BEARER CONTEXT SETUP REQUEST BEARER CONTEXT SETUP RESPONSE BEARER CONTEXT SETUP FAILURE
Bearer Context Modification (gNB-CU-CP initiated) BEARER CONTEXT MODIFICATION REQUEST BEARER CONTEXT MODIFICATION RESPONSE BEARER CONTEXT MODIFICATION FAILURE
Bearer Context Modification Required (gNB-CU-UP initiated) BEARER CONTEXT MODIFICATION REQUIRED BEARER CONTEXT MODIFICATION CONFIRM
Bearer Context Release (gNB-CU-CP initiated) BEARER CONTEXT RELEASE COMMAND BEARER CONTEXT RELEASE COMPLETE
  • Class 2:通知类消息,无响应消息。
过程 消息 作用
Error Indication ERROR INDICATION
Bearer Context Release Request (gNB-CU-UP initiated) BEARER CONTEXT RELEASE REQUEST
Bearer Context Inactivity Notification BEARER CONTEXT INACTIVITY NOTIFICATION
DL Data Notification DL DATA NOTIFICATION
UL Data Notification UL DATA NOTIFICATION
Data Usage Report DATA USAGE REPORT
gNB-CU-UP Counter Check GNB-CU-UP COUNTER CHECK
gNB-CU-UP Status Indication GNB-CU-UP STATUS INDICATION
MR-DC Data Usage Report MR-DC DATA USAGE REPORT

(2)E1AP一般过程按功能划分,可分为两类:

功能 过程
接口管理 gNB-CU-UP E1 Setup
gNB-CU-CP E1 Setup
gNB-CU-UP Configuration Update
gNB-CU-CP Configuration Update
Reset
Error Indication
E1 Release
gNB-CU-UP Status Indication
承载上下文管理 Bearer Context Setup
Bearer Context Modification (gNB-CU-CP initiated)
Bearer Context Modification Required (gNB-CU-UP initiated)
Bearer Context Release (gNB-CU-CP initiated)
Bearer Context Release Request (gNB-CU-UP initiated)
Bearer Context Inactivity Notification
DL Data Notification
UL Data Notification
gNB-CU-UP Counter Check
gNB-CU-UP Counter Check
Data Usage Report
MR-DC Data Usage Report
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