Methods, systems, and apparatus for transmitting uplink control information
A wireless transmit receive unit (WTRU) may be configured to transmit uplink control information such as Hybrid Automatic Retransmission Request (HARQ) Acknowledgement or Negative Acknowledgement (ACK/NACK) using a sequence. The HARQ ACK/NACK may comprise one bit or two bits of information, and the WTRU may use a cyclic shift of the sequence to transmit the HARQ ACK/NACK. The WTRU may use different cyclic shifts of the sequence to transmit different HARQ ACK/NACK values and the cyclic shifts may be separated from each other in a manner to facilitate the transmissions. The WTRU may be further configured to receive, from a physical downlink control channel (PDCCH), an indication of a resource block for transmitting the HARQ ACK/NACK.
1. A wireless transmit receive unit (WTRU) comprising a processor and memory configured to:
receive downlink control information (DCI) for a downlink transmission, the DCI comprising a physical uplink control channel (PUCCH) parameter, the PUCCH parameter corresponding to a PUCCH resource index;
receive the downlink transmission in accordance with the DCI;
determine one or more resource blocks to be used to transmit a PUCCH transmission based on at least the PUCCH parameter received in the DCI;
determine hybrid automatic repeat request (HARQ) feedback for the downlink transmission, wherein the HARQ feedback for the downlink transmission corresponds to one of a HARQ acknowledgment (ACK) or a HARQ non-acknowledgment (NACK);
select at least one cyclic shift that indicates the HARQ feedback for the downlink transmission, wherein the determined cyclic shift that indicates the HARQ ACK/NACK is selected from a subset of available cyclic shifts, the subset of the available cyclic shifts is determined based on at least the PUCCH parameter comprised in the DCI, at least a first cyclic shift of the subset of the available cyclic shifts indicates the HARQ ACK, and at least a second cyclic shift of the subset of the available cyclic shifts indicates the HARQ NACK; and
transmit the PUCCH transmission via the one or more resource blocks using the selected at least one cyclic shift.
2. The WTRU of claim 1 , wherein the selected cyclic shift indicates the HARQ feedback for the downlink transmission and a second HARQ feedback for another downlink transmission.
3. The WTRU of claim 1 , wherein the PUCCH transmission is sent using two orthogonal frequency-division multiplexing (OFDM) symbols.
4. The WTRU of claim 3 , wherein the DCI indicates the two OFDM symbols used for sending the PUCCH transmission.
5. The WTRU of claim 4 , wherein the subset of available cyclic shifts is determined based on at least the two OFDM symbols used for sending the PUCCH transmission.
6. The WTRU of claim 3 , wherein the at least one cyclic shift comprises two cyclic shifts, and the two cyclic shifts comprise a first cyclic shift for the first OFDM symbol of the two OFDM symbols and a second cyclic shift for the second OFDM symbol of the two OFDM symbols.
7. The WTRU of claim 1 , wherein a number of the available cyclic shifts is twelve.
8. The WTRU of claim 7 , wherein the selected cyclic shift further indicates a scheduling request (SR).
9. The WTRU of claim 8 , wherein the subset of the available cyclic shifts indicated by the PUCCH parameter comprises four of the available twelve cyclic shifts, wherein the four of the twelve available cyclic shifts are used to respectively indicate:
the HARQ ACK and a negative SR;
the HARQ ACK and a positive SR;
the HARQ NACK and the negative SR; and
the HARQ NACK and the positive SR.
10. The WTRU of claim 1 , wherein the DCI is received via a physical downlink control channel (PDCCH) transmission.
11. A method implemented by a wireless transmit receive unit (WTRU), the method comprising:
receiving downlink control information (DCI) for a downlink transmission, the DCI comprising a physical uplink control channel (PUCCH) parameter, the PUCCH parameter corresponding to a PUCCH resource index;
receiving the downlink transmission in accordance with the DCI;
determining one or more resource blocks to be used to transmit a PUCCH transmission based on at least the PUCCH parameter received in the DCI;
determining hybrid automatic repeat request (HARQ) feedback for the downlink transmission, wherein the HARQ feedback for the downlink transmission corresponds to one of a HARQ acknowledgment (ACK) or a HARQ non-acknowledgment (NACK);
selecting at least one cyclic shift that indicates the HARQ feedback for the downlink transmission, wherein the determined cyclic shift that indicates the HARQ ACK/NACK is selected from a subset of available cyclic shifts, the subset of the available cyclic shifts is determined based on at least the PUCCH parameter comprised in the DCI, at least a first cyclic shift of the subset of the available cyclic shifts indicates the HARQ ACK, and at least a second cyclic shift of the subset of the available cyclic shifts indicates the HARQ NACK; and
transmitting the PUCCH transmission via the one or more resource blocks using the selected at least one cyclic shift.
12. The method of claim 11 , wherein the selected cyclic shift indicates the HARQ feedback for the downlink transmission and a second HARQ feedback for another downlink transmission.
13. The method of claim 11 , wherein the PUCCH transmission is sent using two orthogonal frequency-division multiplexing (OFDM) symbols.
14. The method of claim 13 , wherein the DCI indicates the two OFDM symbols used for sending the PUCCH transmission.
15. The method of claim 14 , wherein the subset of available cyclic shifts is determined based on at least the two OFDM symbols used for sending the PUCCH transmission.
16. The method of claim 13 , wherein the at least one cyclic shift comprises two cyclic shifts, and the two cyclic shifts comprise a first cyclic shift for the first OFDM symbol of the two OFDM symbols and a second cyclic shift for the second OFDM symbol of the two OFDM symbols.
17. The method of claim 11 , wherein a number of the available cyclic shifts is twelve.
18. The method of claim 17 , wherein the selected cyclic shift further indicates a scheduling request (SR).
19. The method of claim 18 , wherein the subset of the available cyclic shifts indicated by the PUCCH parameter comprises four of the available twelve cyclic shifts, wherein the four of the twelve available cyclic shifts are be used to respectively indicate:
the HARQ ACK and a negative SR;
the HARQ ACK and a positive SR;
the HARQ NACK and the negative SR; and
the HARQ NACK and the positive SR.
20. The method of claim 11 , wherein the DCI is received via a physical downlink control channel (PDCCH) transmission.