Method for performing retransmission in MIMO wireless communication system and apparatus therefor
First Claim
1. A method for performing retransmission at a user equipment in a Multiple-Input Multiple-Output (MIMO) wireless communication system, the method comprising:
- transmitting two transport blocks to a base station using a first uplink grant including a first new data indicator at a first transmission time;
receiving ACK/NACK (Acknowledgement/Negative-ACK) responses and a second uplink grant including a second new data indicator from the base station, each of the ACK/NACK responses corresponding to one of the two transport blocks; and
performing new transmission or retransmission for at least one of the two transport blocks at a second transmission time based on the ACK/NACK responses and the second new data indicator,wherein the second new data indicator indicates whether to perform the new transmission or the retransmission at the second transmission time when one transport block is to be transmitted at the second transmission time and the ACK/NACK responses include one ACK response and one NACK response.
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Abstract
A method for performing retransmission at a user equipment of a MIMO wireless communication system is disclosed. The method comprises transmitting multiple transport blocks to a base station for a transmission unit time in accordance with uplink grant information, which includes a first new data indicator; receiving ACK/NACK (Acknowledgement/Negative-ACK) responses corresponding to the respective transport blocks and uplink grant information, which includes a second new data indicator, from the base station; and performing new transmission or retransmission for the multiple transport blocks in one transport block unit for a transmission unit time in accordance with the ACK/NACK responses and the second new data indicator, if transport rank is reduced to 1.
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Citations
10 Claims
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1. A method for performing retransmission at a user equipment in a Multiple-Input Multiple-Output (MIMO) wireless communication system, the method comprising:
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transmitting two transport blocks to a base station using a first uplink grant including a first new data indicator at a first transmission time; receiving ACK/NACK (Acknowledgement/Negative-ACK) responses and a second uplink grant including a second new data indicator from the base station, each of the ACK/NACK responses corresponding to one of the two transport blocks; and performing new transmission or retransmission for at least one of the two transport blocks at a second transmission time based on the ACK/NACK responses and the second new data indicator, wherein the second new data indicator indicates whether to perform the new transmission or the retransmission at the second transmission time when one transport block is to be transmitted at the second transmission time and the ACK/NACK responses include one ACK response and one NACK response. - View Dependent Claims (2, 3, 4, 5)
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6. A user equipment comprising:
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a radio frequency (RF) module configured to support Multiple-Input Multiple-Output (MIMO) antennas and to transmit and receive a radio signal externally; and a processor operatively coupled to the RF module and configured to; transmit two transport blocks to a base station at a first transmission time using a first uplink grant including a first new data indicator; receive ACK/NACK (Acknowledgement/Negative-ACK) responses and a second uplink grant including a second new data indicator from the base station, each of the ACK/NACK responses corresponding to one of the two transport blocks; and perform new transmission or retransmission for at least one of the two transport blocks at a second transmission time based on the ACK/NACK responses and the second new data indicator, wherein the second new data indicator indicates whether to perform the new transmission or the retransmission at the second transmission time when one transport block is to be transmitted at the second transmission time and the ACK/NACK responses include one ACK response and one NACK response. - View Dependent Claims (7, 8, 9, 10)
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Specification