Sunday, June 16, 2024
No menu items!
Home5G knowledgeWhat is CU and DU in 5G?

What is CU and DU in 5G?

The 5G BTS named gNB can be divided into two physical entities named CU (Centralized Unit) and DU (Distributed Unit).

CU provides support for the higher layers of the protocol stack such as SDAP, PDCP and RRC while DU provides support for the lower layers of the protocol stack such as RLC, MAC and Physical layer. Also, note that SDAP layer will not be present if the CU is connected to a 4G Core network as we should have 5G core network to support SDAP.

Practically speaking, there is a single CU for each gNB, but one CU controls multiple DUs, for example more than 100 DUs can be connected to one CU.

Each DU is able to support one or more cells, so one gNB can control hundreds of cells unlike the 4G BTS. Also, note that the interface between CU and DU is named F1 and as per 3GPP, it should be an open interface, so you connect one CU from vendor X to another DU from vendor Y.

Don’t miss our 5G NR Advanced Training


Benefit from Massive discount on our 5G Training with 5WorldPro.com

The most complete and comprehensive 5G course, follow this link for more information

Start your 5G journey and obtain 5G certification

contact us:  [email protected]

Stay Aware of the last 5G news

Register to our newsletter to receive last 5G news and 5G training details

Follow Us On Linkedin

Most Popular

Receive the latest events

Do you want to participate to this event ?

Get notified about new events

× Which Training you are interested in ?