This invention provides a method and apparatus for coordinating downlink transmission(s) in a wireless communication system comprising a cluster of base station clients in communication with a base station cluster coordinator. The method comprises: receiving from each of the cluster of base station clients, a UE parameter set for each UE served by the respective base station clients; determining cluster parameter sets in respect of respective transmission modes, based on the UE parameter sets; evaluating the cluster parameter sets at the base station cluster coordinator, in order to select at least one of the transmission modes for the base station clients; generating at the base station cluster coordinator at least one output according to the at least one transmission mode; and transmitting each output to at least one of the base station clients to control the corresponding base station client to perform the selected downlink transmissions.