Management apparatus

A management apparatus in a wireless communication system that includes a plurality of transmission points transmitting reference signals, the management apparatus managing the plurality of transmission points, and a mobile station, the management apparatus comprising:

• a processor that manages first and second clusters generated by grouping one or more transmission points used to communicate with the mobile station among the plurality of transmission points;
• a transmitter coupled to the processor for controlling allocation of the reference signals transmitted from the plurality of transmission points in the first and second clusters;
• and
• a memory that stores cell management information managing the overlap of the cells formed by the plurality of transmission points,
• wherein the processor detects that a plurality of cells formed by the transmission points in the first cluster overlap some of a plurality of cells formed by the transmission points in the second cluster,
• wherein when the processor detects the overlap, the transmitter and the processor allocate orthogonal reference signals to both the plurality of cells formed by the transmission points in the first cluster and the plurality of cells formed by the transmission points in the second cluster, and
• wherein when the first cluster or the second cluster are reconstructed to change the transmission points in the first cluster or the transmission points in the second cluster, the processor detects that the plurality of cells formed by the transmission points in the first cluster overlap some of the plurality of cells formed by the transmission points in the second cluster based on the cell management information.