Patent ID: 8842623

Claim:
A method for transmitting an uplink signal at a terminal in a wireless communication system, the method comprising: receiving, by the terminal from a base station, control information for a plurality of layers or antennas consisting of a first layer or antenna, a second layer or antenna, a third layer or antenna, and a fourth layer or antenna; generating, by the terminal, a plurality of reference signals for uplink Multiple Input Multiple Output (MIMO) transmission using the control information; precoding, by the terminal, the plurality of reference signals for spatial multiplexing; and transmitting, by the terminal to the base station, the plurality of precoded reference signals via an uplink subframe via the plurality of layers or antennas, the uplink subframe consisting of two slots, wherein the control information indicates that: a first layer, a second layer, a third layer, and a fourth layer of the plurality of reference signals use an OCC value of 1 in the first slot of the uplink subframe; the first and second layers of the plurality of reference signals use the OCC value of 1 in the second slot of the uplink subframe; and the third and the fourth layers of the plurality of reference signals use an OCC value of −1 in the second slot of the uplink subframe, and wherein the control information further indicates that: the first layer of the plurality of reference signals uses a CS value of 0; the second layer of the plurality of reference signals uses a CS value of 6; the third layer of the plurality of reference signals uses a CS value of 3; and the fourth layer of the plurality of reference signals uses a CS value of 9.