# 3rd task 02.08.22 Explain your figure.What is OAI DU? What are the parts of OAI DU? Which interfaces does OAI DU relates to?
###### tags: `Internship 2nd level`


**Resources:**
- [OAI 5G Standalone Mode](https://www.youtube.com/watch?v=2ScsJfnvLd0)
- [NSA and SA developments](https://www.youtube.com/watch?v=hSEANp5x0k8)
- [OAI 5G RAN PROJECT GROUP](https://openairinterface.org/oai-5g-ran-project/)
- [TESTING_5GSA_setup.md](https://gitlab.eurecom.fr/oai/openairinterface5g/-/blob/develop/doc/TESTING_5GSA_setup.md)
- [What is CU and DU in 5G](https://www.5gworldpro.com/5g-knowledge/what-is-cu-and-du-in-5g.html)
- [OAI CU & DU](https://docs.sd-ran.org/master/oai_cu_cp.html)
- [5G network elements](https://www.affordable5g.eu/wp-content/uploads/sites/63/2022/03/D3.1.pdf)

- [x] What is OAI DU?


OAI open-source software/hardware development model.OAI is the most feature rich open-source project for 3GPP cellular networks, being able to implement both NSA and SA deployments. DU is a split mode which integrated in OAI gNB component according to 3GPP.The DU provides support for the lower layers of the protocol stack such as RLC, MAC, and the physical layer.

- [x] What are the parts of OAI DU?


The DU has High-PHY(FAPI), MAC, RLC & RRC (for handing RRC Config messages from CU) protocols along with F1 interface support. Key Performance Metrics (E2SM_KPM) - RAN Slicing (E2SM_RSM) This component is intended for use with OAI based DU hardware or SDRAN-in-a-Box (RiaB).

- [x] Which interfaces does OAI DU relates to?


OAI adopts a split option F1 interface between the CU and DU.
OAI DU relates to F1 interface, which includes F1-C - control plane and F1-U - user plane.

- [X] Explain your figure which shows comparisons the architecture of OAI gNB (CU/DU mode) versus O-RAN gNB.
-[Deliverable:](https://hackmd.io/olrot9N7Qj2rv0TdFZfCQQ?view)

- [x] 08/2 Deadline