FIELD: wireless communication.
SUBSTANCE: invention is aimed at reducing the amount of information required to indicate the number of HARQ-ACKs for which retransmission is requested. It is achieved in that the base station transmits control information about the request for retransmission of the HARQ-ACK for downlink data to the communication terminal apparatus and receives from it the HARQ-ACK retransmitted based on the control information. The control information is information for identifying one of a plurality of possible number values of the HARQ-ACK plurality for which retransmission is requested and a plurality of possible values configured based on one of the plurality of granularities. Wherein, the base station requests retransmission of the HARQ-ACK by transmitting control information that includes a quantized value of the number of the plurality of HARQ-ACKs for which retransmission is requested, and receives the retransmitted HARQ-ACK selected by the terminal apparatus based on the control information.
EFFECT: reducing the amount of information required to indicate the number of HARQ-ACKs for which retransmission is requested.
22 cl, 17 dwg
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