Carrier aggregation for downlink throughput enhancement in shortened transmission time interval operation

A method for wireless communication, comprising:

• configuring a first component carrier with a first transmission time interval (TTI) or shortened TTI (sTTI) for downlink transmissions and a second component carrier with a second sTTI for uplink transmissions, wherein the second sTTI is shorter than the first TTI or sTTI;
• identifying a hybrid automatic repeat request (HARQ) timing for the first component carrier and associated with downlink transmissions based at least in part on the second sTTI configured for the second component carrier;
• performing a downlink transmission over the first component carrier using the first TTI or sTTI;
• and
• receiving a downlink HARQ positive or negative acknowledgment (ACK/NACK) message corresponding to the downlink transmission according to the identified HARQ timing.

An apparatus for wireless communication, comprising:

• means for identifying a hybrid automatic repeat request (HARQ) timing for a first component carrier configured with a first transmission time interval (TTI) or shortened TTI (sTTI) and associated with downlink transmissions, the HARQ timing for the first component carrier based at least in part on a second sTTI configured for a second component carrier associated with uplink transmissions, wherein the second sTTI is shorter than the first TTI or sTTI;
• means for receiving a downlink transmission over the first component carrier using the first TTI or sTTI;
• and
• means for transmitting a downlink HARQ positive or negative acknowledgment (ACK/NACK) message corresponding to the downlink transmission according to the identified HARQ timing.

An apparatus for wireless communication, comprising:

• means for configuring a first component carrier with a first transmission time interval (TTI) or shortened TTI (sTTI) for downlink transmissions and a second component carrier with a second sTTI for uplink transmissions, wherein the second sTTI is shorter than the first TTI or sTTI;
• means for identifying a hybrid automatic repeat request (HARQ) timing for the first component carrier and associated with downlink transmissions based at least in part on the second sTTI configured for the second component carrier;
• means for performing a downlink transmission over the first component carrier using the first TTI or sTTI;
• and
• means for receiving a downlink HARQ positive or negative acknowledgment (ACK/NACK) message corresponding to the downlink transmission according to the identified HARQ timing.

An apparatus for wireless communication, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• identify a hybrid automatic repeat request (HARQ) timing for a first component carrier configured with a first transmission time interval (TTI) or shortened TTI (sTTI) and associated with downlink transmissions, the HARQ timing for the first component carrier based at least in part on a second sTTI configured for a second component carrier associated with uplink transmissions, wherein the second sTTI is shorter than the first TTI or sTTI;
• receive a downlink transmission over the first component carrier using the first TTI or sTTI;
• and
• transmit a downlink HARQ positive or negative acknowledgment (ACK/NACK) message corresponding to the downlink transmission according to the identified HARQ timing.

An apparatus for wireless communication, comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• configure a first component carrier with a first transmission time interval (TTI) or shortened TTI (sTTI) for downlink transmissions and a second component carrier with a second sTTI for uplink transmissions, wherein the second sTTI is shorter than the first TTI or sTTI;
• identify a hybrid automatic repeat request (HARQ) timing for the first component carrier and associated with downlink transmissions based at least in part on the second sTTI configured for the second component carrier;
• perform a downlink transmission over the first component carrier using the first TTI or sTTI;
• and
• receive a downlink HARQ positive or negative acknowledgment (ACK/NACK) message corresponding to the downlink transmission according to the identified HARQ timing.

A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:

• identify a hybrid automatic repeat request (HARQ) timing for a first component carrier configured with a first transmission time interval (TTI) or shortened TTI (sTTI) and associated with downlink transmissions, the HARQ timing for the first component carrier based at least in part on a second sTTI configured for a second component carrier associated with uplink transmissions, wherein the second sTTI is shorter than the first TTI or sTTI;
• receive a downlink transmission over the first component carrier using the first TTI or sTTI;
• and
• transmit a downlink HARQ positive or negative acknowledgment (ACK/NACK) message corresponding to the downlink transmission according to the identified HARQ timing.

A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:

• configure a first component carrier with a first transmission time interval (TTI) or shortened TTI (sTTI) for downlink transmissions and a second component carrier with a second sTTI for uplink transmissions, wherein the second sTTI is shorter than the first TTI or sTTI;
• identify a hybrid automatic repeat request (HARQ) timing for the first component carrier and associated with downlink transmissions based at least in part on the second sTTI configured for the second component carrier;
• perform a downlink transmission over the first component carrier using the first TTI or sTTI;
• and
• receive a downlink HARQ positive or negative acknowledgment (ACK/NACK) message corresponding to the downlink transmission according to the identified HARQ timing.