Method and apparatus for sending hybrid automatic repeat request feedback for component carrier aggregation

An evolved NodeB (eNB) for receiving carrier aggregation based hybrid automatic repeat request (HARQ) feedback, the eNB comprising:

• a transmitter configured to send information on a downlink control channel;
• the transmitter further configured to send a plurality of codewords to a wireless transmit/receive unit (WTRU) based on the information transmitted on the downlink control channel;
• and
• a receiver configured to receive, via a physical uplink control channel (PUCCH) format 1b resource, a carrier aggregation based HARQ feedback comprising a bundled ACK/NACK for the codewords based on the WTRU's decoding results of the codewords, wherein ACK/NACKs are grouped and the bundled ACK/NACK is received for a group of ACK/NACKs, wherein a bundled ACK is received on a condition that all codewords belonging to the group are successfully decoded and a bundled NACK is received on a condition that at least one codeword belonging to the group is not successfully decoded by the WTRU.

A wireless transmit/receive unit (WTRU) for providing carrier aggregation based hybrid automatic repeat request (HARD) feedback, the WTRU comprising:

• a processor, the processor configured to:
• determine that the WTRU is configured to use carrier aggregation via a first downlink (DL) component carrier and a second (DL) component carrier;
• receive a first codeword via the first DL component carrier;
• receive a second codeword via the second DL component carrier;
• group the first DL component carrier and second DL component carrier into a carrier group;
• generate a bundled acknowledgement/non-acknowledgement (ACK/NACK) for the first DL component carrier and the second DL component carrier using the first codeword and the second codeword;
• and
• send the bundled ACK/NACK using physical uplink control channel (PUCCH) format 1b with channel selection.

A method for providing carrier aggregation based hybrid automatic repeat request (HARD) feedback, the method comprising:

• determining that a wireless transmit/receive unit (WTRU) is configured to use carrier aggregation via a first downlink (DL) component carrier and a second (DL) component carrier;
• receiving a first codeword via the first DL component carrier;
• receiving a second codeword via the second DL component carrier;
• grouping the first DL component carrier and second DL component carrier into a carrier group;
• generating a bundled acknowledgement/non-acknowledgement (ACK/NACK) for the first DL component carrier and the second DL component carrier using the first codeword and the second codeword;
• and
• sending the bundled ACK/NACK using physical uplink control channel (PUCCH) format 1b with channel selection.