receive a scheduling grant signal from the node b for every uplink signal transmission in this case the ue may acquire precoding matrix information from the scheduling grant signal and precodes an uplink signal based on the precoding matrix information prior to transmission to the node b in accordance with the exemplary embodiment of the present invention meanwhile a synchronous harq system that presets a retransmission timing does not require the ue to receive a scheduling grant signal from the node b for each uplink retransmission accordingly there exists a need for a method for efficiently acquiring precoding matrix information that will apply to a particular retransmission harq process block taking into account the feature of the synchronous harq system in the ue which will be described below in detail further when the system employs semi persistent scheduling sps such as the system providing services for voip voice over internet protocol the bs sets transmission parameters such as rb allocation and mcs semi statically in sps operation a bs does not transmit scheduling grant signal for initial uplink transmission and may transmit scheduling grant for a retransmission if necessary accordingly there exists a need for a method for efficiently acquiring precoding matrix information that will apply to a particular retransmission harq process block taking into account the feature of the sps system in the ue which also will be described below in detail fig3 illustrates methods for transmitting an uplink signal in a mimo scheme in a ue according to exemplary embodiments of the present invention fig3 a illustrates a case of receiving a scheduling grant signal from a node b for every uplink transmission.