You can check UE category CAT -6 onwards & supported Band combination in carrier aggregation bandwidth class in UE capability information message.
while performing carrier aggregation what parametes we need to configure at eNB side
How inter eNB carrier aggregation works in LTE ? How ue aggregate carrier from two different enb which messege ue receives? is it possible to perform carrier aggregation of two enB which are not connected using X2 interface ?