HARQ-ACK information feedback method and apparatus

A method for receiving hybrid automatic repeat request-acknowledgement (HARQ-ACK) information by a base station, the method comprising:

• transmitting, to a user equipment (UE), downlink control information (DCI) including a downlink assignment indicator (DAI) on a physical downlink control channel (PDCCH) or enhanced PDCCH (ePDCCH);
• transmitting, to the UE, data on a physical downlink shared channel (PDSCH);
• and
• receiving, from the UE, the HARQ-ACK information for the data in a same uplink subframe on a physical uplink control channel (PUCCH),
• wherein the HARQ-ACK information is generated by the UE based on the DAI and a bundling window, wherein the bundling window associated with the DAI includes downlink subframes corresponding to the same uplink subframe, and the downlink subframes corresponding to the same uplink subframe are indexed first in order of a frequency index and then in order of a time index,
• wherein the downlink subframes in the bundling window are indexed in increasing order of first frequency indexes at a first time index associated with the DAI and then the downlink subframes in the bundling window are indexed in increasing order of second frequency indexes at a second time index associated with the DAI, and
• wherein the first time index and the second time index are determined in increasing order of a subframe index.

A user equipment (UE) for feeding back hybrid automatic repeat request-acknowledgement (HARQ-ACK) information, the UE comprising:

• a transceiver;
• and
• at least one processor configured to:
• control the transceiver to receive, from a base station, downlink control information (DCI) including a downlink assignment indicator (DAI) on a physical downlink control channel (PDCCH) or enhanced PDCCH (ePDCCH),
• control the transceiver to receive, from the base station, data on a physical downlink shared channel (PDSCH),
• generate the HARQ-ACK information for the data based on the DAI and a bundling window, wherein the bundling window associated with the DAI includes downlink subframes corresponding to a same uplink subframe, and the downlink subframes corresponding to the same uplink subframe are indexed first in order of a frequency index and then in order of a time index, and
• control the transceiver to transmit, to the base station, the HARQ-ACK information in the same uplink subframe on a physical uplink control channel (PUCCH),
• wherein the downlink subframes in the bundling window are indexed in increasing order of first frequency indexes at a first time index associated with the DAI and then the downlink subframes in the bundling window are indexed according to in increasing order of second frequency indexes at a second time index associated with the DAI, and
• wherein the first time index and the second time index are determined in increasing order of a subframe index.

A base station for receiving hybrid automatic repeat request-acknowledgement (HARQ-ACK) information, the base station comprising:

• a transceiver;
• and
• at least one processor configured to:
• control the transceiver to transmit, to a user equipment (UE), downlink control information (DCI) including a downlink assignment indicator (DAI) on a physical downlink control channel (PDCCH) or enhanced PDCCH (ePDCCH),
• control the transceiver to transmit, to the UE, data on a physical downlink shared channel (PDSCH), and
• control the transceiver to receive, from the UE, the HARQ-ACK information for the data in a same uplink subframe on a physical uplink control channel (PUCCH),
• wherein the HARQ-ACK information is generated by the UE based on the DAI and a bundling window, wherein the bundling window associated with the DAI includes downlink subframes corresponding to the same uplink subframe, and the downlink subframes corresponding to the same uplink subframe are indexed first in order of a frequency index and then in order of a time index,
• wherein the downlink subframes in the bundling window are indexed in increasing order of first frequency indexes at a first time index associated with the DAI and then the downlink subframes in the bundling window are indexed in increasing order of second frequency indexes at a second time index associated with the DAI, and
• wherein the first time index and the second time index are determined in increasing order of a subframe index.