Limitation of UE support to DSS

Hi All,
Is there any limitation of UE support to DSS?
We are deploying 2G-4G DSS.
Means same UE which can support 10 MHz 4G FDD can it accommodate dynamic 9 MHz (8 to 9) 1 MHz reserved for 2G in 4G spectrum for DSS?

Are you deploying 900M or 1800M?

It is 1800M.

2G 4G DSS? What is that?

I assumed it is CloudAir feature from Huawei.
Where you can dynamically share the spectrum in legacy technologies.