Dear Rocel,
In case of Huawei, you should enable the parameter named Concentric Handover Allowed.
If you have got the LMT installed, please go through the Handover Tab -> Concentric Data, this is where you will find parameters related to Concentric cells. (Rxlevel thresholds etc) Also some switches to enable UL to OL and OL to UL handovers.
Regards,