Does an interruption of the traffic to do the user plane switch in 5G have impact in throughput?

5G NR
1

Hello Experts.

Imagine you are connected to 5G NSA Option3X, and you have configured SN Terminated Bearer.

The network send the traffic through S1-gNB-PDCP 5G-RLC 5G.

But if you have RLF on 5G (SCG) detected by UE (SCG Failure - RLC max trans), do you know if the network has to switch the user plane to send the traffic through S1->gNb-> PDCP 4G to UE?

And if there is an interruption of the traffic to do the user plane switch, does it impact in throughput?

2

I think it depends on config as well eNB capacity.

So In lab while we’re testing keeping secondary path & b100, we used to see a sudden change in throuput after scg failure happens.

For real network not sure how implementation done now.

3

Does throughput goes to 0?

4

No, it goes by eNB X2u path.

As in 3x , we used to configure b100.

5

But do you know if there is some ms interruption when the switching is happening?

Or is the switch done instantly?

6

Not so sure about that part if interruption coming in ms, need to check once.

7

Ok, thanks.

But why the throughput degradation happens?

Is it because of the packets retransmision?