Data transmission method in a radio communication system

A method for data transmission in a radio communication system, the method comprising:

• selecting a first reference transmission antenna of a first base station and a second reference transmission antenna of a second base station from among a plurality of base stations;
• grouping the plurality of base stations into a first transmission group and a second transmission group according to the priority order of downlink channel performance, wherein the first base station belongs to the first transmission group and the second base station belongs to the second transmission group;
• transmitting a first transmission data stream via the first reference transmission antenna, and transmitting a second transmission data stream via the second reference transmission antenna to a terminal;
• and
• retransmitting the first transmission data stream to the terminal via a transmission antenna of a first transmission group, after time-delaying, and retransmitting the second transmission data stream to the terminal via a transmission antenna of a second transmission group, after time-delaying.

A method for data transmission in a radio communication system, the method comprising:

• selecting a first reference transmission antenna of a first base station and a second reference transmission antenna of a second base station from among a plurality of base stations, and grouping a plurality of transmission antennas included in the plurality of base stations into a first transmission group and a second transmission group, wherein the first reference transmission antenna belongs to the first transmission group and the second reference transmission antenna belongs to the second transmission group;
• transmitting a first transmission data stream via the first reference transmission antenna, and transmitting a second transmission data stream via the second reference transmission antenna to a terminal;
• and
• retransmitting the first transmission data stream to the terminal via a transmission antenna of a first transmission group, after time-delaying, and retransmitting the second transmission data stream to the terminal via a transmission antenna of a second transmission group, after time-delaying,
• wherein the step of grouping comprises:
• determining from a transmission antenna having the highest order to a transmission antenna having the determined order into the first transmission group, among a plurality of transmission antennas, and determining remainder antennas except the transmission antennas of the first transmission group into the second transmission group.