5G學習筆記之E1AP

gnb-cu：gnb central unit，乙個邏輯節點，承載gnb的rrc、sdap、pdcp協議，或en-gnb的rrc和pdcp協議。 gnb-du：gnb distributed unit ，乙個邏輯節點，承載gnb或en-gnb的rlc、mac和phy。 gnb-cu-cp：gnb-cu-control plane，乙個邏輯節點，承載gnb或en-gnb的rrc以及pdcp控制面。

gnb-cu-up：gnb-cu-user plane，乙個邏輯節點，承載en-gnb的pdcp使用者面，或gnb的pdcp使用者面和sdap。

1. e1ap服務

e1ap提供gnb-cu-cp節點與gnb-cu-up節點之間的信令服務。服務分為兩類：

2. e1ap一般過程分類

（1）e1ap一般過程按是否有響應，可分為兩類：

一般過程

發起訊息

成功響應

失敗響應

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 acknowledge

gnb-cu-up configuration update failure

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 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

過程訊息

作用error indication

error indication

bearer context release request (gnb-cu-up initiated)

bearer context release request

bearer context inactivity notification

dl data notification

ul data notification

data usage report

gnb-cu-up counter check

gnb-cu-up status indication

mr-dc data usage report

（2）e1ap一般過程按功能劃分，可分為兩類：功能

過程介面管理