User terminal and radio communication method
To properly perform retransmission control in future radio communication systems, a user terminal according to one aspect of the present invention is provided with a receiving section that receives a downlink (DL) signal comprised of a transport block including a plurality of code blocks, and a control section that controls transmission of receipt confirmation information to the DL signal, where even in the case where transmission of the receipt confirmation information for each code block is configured, the control section controls transmission of the receipt confirmation information for each transport block, based on downlink control information (DCI) for scheduling the DL signal or payload of an uplink (UL) signal.
1 . A terminal comprising:
a receiver that receives a downlink (DL) signal comprised of a transport block including a plurality of code block groups; and
a processor that controls transmission of receipt confirmation information per code block group for the DL signal,
wherein in response to transmission of the receipt confirmation information for each code block group being configured by Radio Resource Control (RRC) signaling and the receiver receiving a given downlink control information (DCI) for scheduling the DL signal, the processor controls transmission of the receipt confirmation information for each transport block rather than for each code block group,
wherein in response to a HARQ-ACK codebook being configured to be semi-static, the processor controls transmission of the receipt confirmation information for each code block group, based on a number of code block groups, which are obtained by grouping a plurality of code blocks, per transport block configured by the RRC signaling, and
wherein the DCI includes information indicating whether scheduled DL signal transmission is new transmission or retransmission, and when the information indicates the DL signal transmission is retransmission, the DCI includes information indicating a code block group to retransmit.
2 . The terminal according to claim 1 , wherein the processor controls transmission of the receipt confirmation information for each code block group, based on downlink assignment indicator (DAI) included in the DCI.
3 . A radio communication method for a terminal, comprising:
receiving a downlink (DL) signal comprised of a transport block including a plurality of code block groups; and
controlling transmission of receipt confirmation information per code block group for the DL signal,
wherein in response to transmission of the receipt confirmation information for each code block group being configured by Radio Resource Control (RRC) signaling and the terminal receiving a given downlink control information (DCI) for scheduling the DL signal, the terminal controls transmission of the receipt confirmation information for each transport block rather than for each code block group,
wherein in response to a HARQ-ACK codebook being configured to be semi-static, the terminal controls transmission of the receipt confirmation information for each code block group, based on a number of code block groups, which are obtained by grouping a plurality of code blocks, per transport block configured by the RRC signaling, and
wherein the DCI includes information indicating whether scheduled DL signal transmission is new transmission or retransmission, and when the information indicates the DL signal transmission is retransmission, the DCI includes information indicating a code block group to retransmit.
4 . A base station comprising:
a transmitter that transmits a downlink (DL) signal comprised of a transport block including a plurality of code block groups; and
a receiver that receives receipt confirmation information per code block group for the DL signal,
wherein in response to transmission of the receipt confirmation information for each code block group being configured by Radio Resource Control (RRC) signaling and the transmitter transmitting a given downlink control information (DCI) for scheduling the DL signal, the receiver receives the receipt confirmation information for each transport block rather than for each code block group,
wherein in response to a HARQ-ACK codebook being configured to be semi-static, the receiver receives the receipt confirmation information for each code block group, transmitted based on a number of code block groups, which are obtained by grouping a plurality of code blocks, per transport block configured by the RRC signaling, and
wherein the DCI includes information indicating whether scheduled DL signal transmission is new transmission or retransmission, and when the information indicates the DL signal transmission is retransmission, the DCI includes information indicating a code block group to retransmit.
5 . A system comprising a base station and a terminal, wherein:
the base station comprises:
a transmitter that transmits a downlink (DL) signal comprised of a transport block including a plurality of code block groups; and
the terminal comprises:
a receiver that receives the DL signal; and
a processor that controls transmission of receipt confirmation information per code block group for the DL signal,
wherein in response to transmission of the receipt confirmation information for each code block group being configured by Radio Resource Control (RRC) signaling and the receiver receiving a given downlink control information (DCI) for scheduling the DL signal, the processor controls transmission of the receipt confirmation information for each transport block rather than for each code block group,
wherein in response to a HARQ-ACK codebook being configured to be semi-static, the processor controls transmission of the receipt confirmation information for each code block group, based on a number of code block groups, which are obtained by grouping a plurality of code blocks, per transport block configured by the RRC signaling, and
wherein the DCI includes information indicating whether scheduled DL signal transmission is new transmission or retransmission, and when the information indicates the DL signal transmission is retransmission, the DCI includes information indicating a code block group to retransmit.