Understanding the differences between NSA and EN-DC modes in 5G Networks

5G NR
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1

Hi Experts.

We know that in NSA (Non-Standalone) mode, a 5G node (gNodeB) is part of the setup, with 4G serving as the Master and connected to the 4G Core (EPC), which also supports the 5G node. This allows us to use both 4G and 5G traffic simultaneously.

So, what exactly is different in EN-DC mode, and how does it differ from regular NSA? I understand that EN-DC is a subset or feature of NSA.

Admin note: this post was updated with image below.

5G Deployment Options: Know All in Details, Options 1, 2, 3, 4, 5, 6, 7
5G Deployment Options: Know All in Details, Options 1, 2, 3, 4, 5, 6, 71024×458 123 KB

2

In NSA (Non-Standalone) mode, we can have either EN-DC or NE-DC configurations:

  • EN-DC (E-UTRAN New Radio Dual Connectivity): The eNodeB (4G node) serves as the anchor for the control plane or signaling.
  • NE-DC (NR E-UTRAN Dual Connectivity): The gNodeB (5G node) acts as the anchor.

Standalone (SA) mode also has different configurations, such as NR-DC (NR Dual Connectivity), where the 5G gNodeB manages both control and user planes independently of LTE.

3

So, NSA can’t operate on its own, right?

It requires either EN-DC or NE-DC to be enabled?

4

As I understand it, NSA means either EN-DC or NE-DC is enabled.

5

Go through this detailed link: 5G Deployment Options: Know All in Details, Options 1, 2, 3, 4, 5, 6, 7

1 Like
6

Thanks!

So, 3x is referred to as EN-DC.

7

3x has been the preferred deployment method as an interim solution when operators have 5G Radios but lack a 5G Core.

8

Depending on data split at RLC, PDCP, 3a, options available.

These options are customizable and configurable through RRC parameters.

9

In the 3x option, data is split at the PDCP layer on the gNB side.