LTE CA with MIMO & SISO mix of cells

Hello Professionals.

Do you know if there are any limitations from the 3GPP standard to activate LTE Carrier Aggregation between two component carriers the 1st with MIMO & the 2nd with SISO?

I.e. 2CC CA: 2x2 MIMO + 1x1 SISO?

Yes! I have the same question. It seems that in Nokia it is not possible but how about the standard?

Didn’t see.