An apparatus for determining a control unit of a plurality of control units in a wireless communication system for controlling a cooperative transmission or a cooperative reception between base stations and a wireless device, wherein the wireless communication system comprises a wireline core network with a plurality of control units and a plurality of base stations, wherein each control unit is able to control one or more base stations. The apparatus comprises a cluster feasibility processor (400) configured to receive a cluster feasibility response from at least one other control unit than a control unit controlling a base station serving a wireless device containing information of a feasible wireline cluster of base stations controllable by the at least one other control unit; and a control unit selector (403) configured to select the at least one control unit for controlling a cooperative transmission or a cooperative reception between at least two base stations and the wireless device based on the at least one received information of the feasible wireline cluster of base stations controllable by the at least one other control unit.
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