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# System prepended metadata

title: 3.1. 3GPP Access Network ~ Next Generation- Radio Access Network (NG-RAN)

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## RAN Overview
### NG-RAN
defined by 3GPP
### O-RAN 
defined by Open-RAN
## Split option
## Architecture
### CU 
### DU
### RU
## Interfaceses
### O1 ()
### E2
## Protocol
## Call Flow 
## Opensource
### UERANSIM
### Openairinterface



