For FR1+FR2 how will UE add FR2 in NR-DC?

5G NR
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1

Hi Experts.

For NR-DC I have 1 query:

For FR1+FR2 how will UE add FR2 in NR-DC?
Is it with help of RRC reconfiguration message or other procedure?

2

I have never checked NR-DC.

But regarding NR-DC addition, I don’t think there is any other way than RRC reconfiguration.
So yes, any control plane signalling require RRC reconfiguration.

3

A4 event will trigger the nrdc and FR2 is added by RRC reconfiguration message.

4

Thanks!
I didn’t seen any A4 event in logs, please help to tell what role of A4 event in NR-DC?
Is it trigger if neighbour cell better then predefined offset?
Is it like whenever FR2 cell better then A4 trigger leads to NR-DC?

Can we have FR2 + FR1 as well in NR-DC?

5

Yes, CA in EN-DC between FR1 and FR2 see mediatek results here:

https://www.mediatek.com/blog/mediatek-m80-5g-first-with-both-fr1-fr2-dc-and-ca