HARQ feedback using carrier aggregation

A device for providing hybrid automatic repeat request (HARQ) feedback for data received in downlink transmission, wherein a carrier aggregation of a downlink Frequency-Division Duplexing (FDD) carrier and a Time-Division Duplexing (TDD) carrier is applied in the downlink transmission, comprising:

• a memory storing program instructions and a processor coupled to the memory, wherein when executed by the processor, the instructions cause the device to:
• receive first data carried in a subframe n in the downlink FDD carrier, wherein a first uplink control channel subframe in an uplink FDD carrier is associated with the subframe n in the downlink FDD carrier, and a subframe n in the TDD carrier is an uplink subframe;
• select a sequence and a modulation symbol, or select a modulation symbol, to form a first HARQ feedback indicating whether the first data has been correctly received;
• and
• transmit the first HARQ feedback on a scheduling request resource of the first uplink control channel subframe in the uplink FDD carrier,
• wherein spatial bundling is not performed in the first uplink control channel subframe.

A method for receiving hybrid automatic repeat request (HARQ) feedback for data transmitted in downlink transmission, wherein a carrier aggregation of a downlink Frequency-Division Duplexing (FDD) carrier and a Time-Division Duplexing (TDD) carrier is applied in the downlink transmission, comprising:

• transmitting, by a radio network node to a recipient device, first data in a subframe n in the downlink FDD carrier, wherein a first uplink control channel subframe in an uplink FDD carrier is associated with the subframe n in the downlink FDD carrier, and a subframe n in the TDD carrier is an uplink subframe;
• and
• receiving, by the radio network node from the recipient device, a first HARQ feedback for the first data, wherein the first HARQ feedback is carried on a scheduling request resource of the first uplink control channel subframe in the uplink FDD carrier,
• wherein spatial bundling is not performed in the first uplink control channel subframe.

A radio network node for receiving hybrid automatic repeat request (HARQ) feedback for data transmitted in downlink transmission, wherein a carrier aggregation of a downlink Frequency-Division Duplexing (FDD) carrier and a Time-Division Duplexing (TDD) carrier is applied in the downlink transmission, comprising:

• a memory storing program instructions and a processor coupled to the memory, wherein when executed by the processor, the instructions cause the radio network node to:
• transmit, to the recipient device, first data in a subframe n in the downlink FDD carrier, wherein a first uplink control channel subframe in an uplink FDD carrier is associated with the subframe n in the downlink FDD carrier, and a subframe n in the TDD carrier is an uplink subframe;
• and
• receive, from the recipient device, a first HARQ feedback for the first data, wherein the first HARQ feedback is carried on a scheduling request resource of the first uplink control channel subframe in the uplink FDD carrier, and spatial bundling is not performed in the first uplink control channel subframe.