LTE ACK/NACK for PDSCH Transmissions

The UE shall, upon detection of a PDSCH transmission in subframe n-4 intended for the UE and for which an ACK/NACK shall be provided, transmit the ACK/NACK response in subframe n.

CQI/PMI/RI and ACK/NACKs multiplexing on PUCCH is possible:
• Format 2:
– CQI/PMI/RI not multiplexed with ACK/NAK
• Format 2a/2b
– CQI/PMI/RI multiplexed with ACK/NAK (normal CP)
• Format 2:
– CQI/PMI or RI multiplexed with ACK/NAK (extended CP)
ACK/NACK for PDSCH Transmissions
The UE shall, upon detection of a PDSCH transmission in subframe n-4
intended for the UE and for which an ACK/NACK shall be provided,
transmit the ACK/NACK response in subframe n.
ACK/NACKs alone can be delivered PUCCH format 1a and 1b