Method and apparatus for performing a hybrid automatic repeat request process for an uplink multi-codeword transmission in a wireless communication system which supports a multi-antenna transmission

摘要

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for performing a hybrid automatic repeat request process for an uplink multi-codeword transmission in a wireless communication system which supports a multi-antenna transmission. The uplink multi-codeword transmission method according to one embodiment comprises the following steps: transmitting first and second codewords, transmitting information on the status of transmission buffer for the first and second codewords, receiving downlink control information (DCI) containing acknowledgement (ACK)/negative acknowledgement (NACK) information on each of the first and second codewords, and re-transmitting the codeword for NACK information, wherein the codeword for NACK information, wherein the codeword for ACK information is not transmitted to a base station in cases where the transmission buffer is empty.

主权项

1. A method of performing uplink multiple-codeword hybrid automatic repeat request (HARQ) transmission, the method comprising:
transmitting, at a user equipment, first and second codewords to a base station; transmitting information about transmission buffer states of the first and second codewords to the base station; receiving downlink control information (DCI) including acknowledgement (ACK)/negative acknowledgement (NACK) information for each of the first and second codewords from the base station, wherein the ACK/NACK information is obtained by decoding a Physical Downlink Control Channel (PDCCH) without decoding a Physical HARQ Indication Channel (PHICH); and retransmitting a codeword corresponding to NACK, wherein, when receiving the DCI including control information for scheduling a new uplink transmission for the codeword corresponding to ACK, a codeword corresponding to ACK is not transmitted to the base station when the transmission buffer for the codeword corresponding to ACK is empty, and wherein the transmission buffer of the user equipment is for temporarily storing data to be transmitted for each of the first and second codewords and is different from a HARQ buffer being used by the user equipment for storing data for a retransmission of previously transmitted data.