Patent ID: 10868595

Abstract:
Methods, systems, and devices for wireless communications are described. A size of a hybrid automatic repeat request (HARQ)-acknowledgment (ACK) codebook may be determined and indicated when the HARQ-ACK codebook is transmitted. For example, a user equipment (UE) may transmit a number of information bits within a HARQ-ACK codebook, and may further indicate a size of the HARQ-ACK codebook based on the number of information bits. The UE may transmit the indication of the size of the HARQ-ACK codebook on the same or different time/frequency resources as the HARQ-ACK codebook, using a particular field, using a different uplink channels, or the like. Additionally or alternatively, the UE may indicate the size of the HARQ-ACK codebook using a particular pattern or sequence of reference signals associated with the channel used to carry the HARQ-ACK codebook.