top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration

Facebook Login
Site Registration

5G: How the user plane data flow between CU- UP and DU-UP ?

0 votes
59 views

In CU-DU architecture, how user plane data is going to flow ?

posted May 22 by Vimal Kumar Mishra

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

+1 vote

DL Data

DL Data between CU-UP and DU-UP flows via NRUP protocol layer. NRUP is used for flow control between CU-UP and DU-UP.
And it is used for DL data only. NRUP sits at both CU-UP and DU-UP.
You may refer to 3GPP Spec 38.425 for more information.

You can think of the call flow as:
CU: EGTP-Upper=>SDAP=>PDCP=>NRUP=>EGTP-Lower => DU
DU: EGTP => NRUP => RLC => MAC => L1

--

UL data:

DU: L1 => MAC => RLC => EGTP => CU
CU: EGTP-Lower =>PDCP => SDAP=> EGTP-Upper => UPF

answer Jun 2 by Shobhit Upadhyay
Similar Questions
0 votes

How UE connected to gNB in 5G. gNB split into 2 parts, gNB CU and gNB DU. So to which part UE will connect to?

+3 votes

LTE network uses GTP-U based interface between eNodeB and SGW to transport user data, Is 5G network going to similar GTP based user plane between NG-RAN and UPF ?

0 votes

I heard a new term CUPS and did some googling and came to know about this term. CUPS stands for control and user plane segregation. In LTE network, control and user planes both are used as a single node. In LTE network, SGW does buffering of any incoming data for and SGW node was doing buffering when UE in RRC-IDLE mode. I can understand control part would be same as GTP-C but how user plane of 5G network would be implemented ? Does the 3GGP standard talk about implementation of user plane ? Would it be GTP based or something else ?

Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...