FIELD: wireless communication networks.
SUBSTANCE: invention relates to a terminal device, which includes a receiver, which can receive PSDCH, and a transmitter, which can transmit HARQ-ACK for PDSCH using PUCCH. For this purpose, for communication of a terminal device with a base station device, steps are taken to receive a physical shared channel for downlink data transmission (PDSCH), transmission of hybrid automatic repeat request (HARQ-ACK) acknowledgment for PDSCH using physical uplink control channel (PUCCH), shorter HARQ-ACK transmission time for the PDSCH based on the transmission time length (TTI) having a predetermined value which is configured for the PDSCH, and determining the PUCCH format for HARQ-ACK transmission based on the TTI length of the PDSCH channel and the TTI length of the PUCCH channel.
EFFECT: technical result is shorter transmission time of HARQ-ACK for PDSCH based on a predetermined length of TTI, configured for PDSCH, due to that the PUCCH format for HARQ-ACK transmission is determined based on the TTI length of the PDSCH channel and the TTI length of the PUCCH channel.
6 cl, 7 dwg
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