User terminal and radio communication method
To properly control UL transmissions of A/N in response to a plurality of DL transmissions with different requirements and the like, one aspect of a user terminal in the present disclosure has a transmitting section that transmits a first delivery acknowledgement signal (A/N) in response to a first PDSCH and a second A/N in response to a second PDSCH transmitted later than the first PDSCH, and a control section that controls to transmit at least one of the first A/N and the second A/N, using one of an uplink control channel configured for the first A/N and another uplink control channel configured for the second A/N, in a case where transmission timing of the first A/N overlaps transmission timing of the second A/N.
1. A terminal comprising:
a transmitter that transmits a first delivery acknowledgement signal (A/N) in response to a first physical downlink shared channel (PDSCH), and a second A/N in response to a second PDSCH, the first A/N being scheduled by first downlink control information and the second A/N being scheduled by second downlink control information; and
a processor that performs a control, in response to an indication of transmission timing of the first A/N indicating that the transmission timing of the first A/N is in a same slot as the transmission timing of the second A/N, to transmit for the first A/N and for the second A/N a same uplink control channel in the same slot,
wherein the first A/N and the second A/N are transmitted in the same uplink control channel,
the indication of the transmission timing of the first A/N is included in the first downlink control information,
a transmission indication of second A/N is indicated by the second downlink control information at a later timing than a transmission indication of the first A/N that is indicated by the first downlink control information,
the same uplink control channel, on which the first A/N and the second A/N are transmitted, is applied as an uplink control channel for the transmission of the second A/N that is indicated by the second downlink control information at the later timing,
the terminal receives an indication of a transmission timing of a third A/N, indicating that the transmission timing of the third A/N in response to a third PDSCH is in a same slot as the transmission timing of the first A/N, the third A/N being scheduled by third downlink control information, and
in a case where a transmission indication of the third A/N is indicated by the third downlink control information at a later timing than the transmission indication of the first A/N by the first downlink control information, when a priority of the third A/N is lower than a priority of the first A/N, the first A/N is transmitted and the third A/N is not transmitted.
2. A radio communication method in a terminal, comprising:
transmitting a first delivery acknowledgement signal (A/N) in response to a first physical downlink shared channel (PDSCH), and a second A/N in response to a second PDSCH, the first A/N being scheduled by first downlink control information and the second A/N being scheduled by second downlink control information; and
performing a control, in response to an indication of transmission timing of the first A/N indicating that the transmission timing of the first A/N is in a same slot as the transmission timing of the second A/N, to transmit for the first A/N and for the second A/N a same uplink control channel in the same slot,
wherein the first A/N and the second A/N are transmitted in the same uplink control channel,
the indication of the transmission timing of the first A/N is provided by the first downlink control information,
a transmission indication of the second A/N is indicated by the second downlink control information at a later timing than a transmission indication of the first A/N that is indicated by the first downlink control information,
the same uplink control channel, on which the first A/N and the second A/N are transmitted, is applied as an uplink control channel for the transmission of the second A/N that is indicated by the second downlink control information at the later timing,
the terminal receives an indication of a transmission timing of a third A/N, indicating that the transmission timing of the third A/N in response to a third PDSCH is in a same slot as the transmission timing of the first A/N, the third A/N being scheduled by third downlink control information, and
in a case where a transmission indication of the third A/N is indicated by the third downlink control information at a later timing than the transmission indication of the first A/N by the first downlink control information, when a priority of the third A/N is lower than a priority of the first A/N, the first A/N is transmitted and the third A/N is not transmitted.
3. A base station comprising:
a processor that indicates a transmission timing of a first delivery acknowledgement signal (A/N), the processor indicating that the transmission timing of the first A/N in response to a first physical downlink shared channel (PDSCH) is in a same slot as a transmission timing of a second A/N in response to a second PDSCH, the first A/N being scheduled by first downlink control information and the second A/N being scheduled by second downlink control information; and
a receiver that, when a reception timing of the first A/N is in a same slot as a reception timing of the second A/N, receives for the first A/N and for the second A/N a same uplink control channel in the same slot,
wherein the first A/N and the second A/N are received in the same uplink control channel,
the indication of the transmission timing of the first A/N is included in the first downlink control information,
a transmission indication of the second A/N is indicated by the second downlink control information at a later timing than a transmission indication of the first A/N that is indicated by the first downlink control information,
the same uplink control, on which the first A/N and the second A/N are transmitted, is applied as an uplink control channel for the transmission of the second A/N that is indicated by the second downlink control information the later timing,
the base station transmits an indication of a transmission timing of a third A/N, indicating that the transmission timing of the third A/N in response to a third PDSCH is in a same slot as the transmission timing of the first A/N, the third A/N being scheduled by third downlink control information, and
in a case where a transmission indication of the third A/N is indicated by the third downlink control information at a later timing than the transmission indication of the first A/N by the first downlink control information, when a priority of the third A/N is lower than a priority of the first A/N, the first A/N is transmitted and the third A/N is not transmitted.
4. A system comprising a terminal and a base station, wherein:
the terminal comprises:
a transmitter that transmits a first delivery acknowledgement signal (A/N) in response to a first physical downlink shared channel (PDSCH), and a second A/N in response to a second PDSCH, the first A/N being scheduled by first downlink control information and the second A/N being scheduled by second downlink control information; and
a processor that performs a control, in response to an indication of transmission timing of the first A/N indicating that the transmission timing of the first A/N is in a same slot as the transmission timing of the second A/N, to transmit for the first A/N and for the second A/N a same uplink control channel in the same slot,
wherein the first A/N and the second A/N are transmitted in the same uplink control channel,
the indication of the transmission timing of the first A/N is included in the first downlink control information,
a transmission indication of the second A/N is indicated by the second downlink control information at a later timing than a transmission indication of the first A/N that is indicated by the first downlink control information,
the same uplink control channel, on which the first A/N and the second A/N are transmitted, is applied as an uplink control channel for the transmission of the second A/N that is indicated by the second downlink control information at the later timing,
the terminal receives an indication of a transmission timing of a third A/N, indicating that the transmission timing of the third A/N in response to a third PDSCH is in a same slot as the transmission timing of the first A/N, the third A/N being scheduled by third downlink control information, and
in a case where a transmission indication of the third A/N is indicated by the third downlink control information at a later timing than the transmission indication of the first A/N by the first downlink control information, when a priority of the third A/N is lower than a priority of the first A/N, the first A/N is transmitted and the third A/N is not transmitted, and
the base station comprises:
a processor that indicates a transmission timing of the first A/N, the processor indicating that the transmission timing of the first A/N in response to the first PDSCH is in the same slot as the transmission timing of the second A/N in response to the second PDSCH, the first A/N being scheduled by the first downlink control information and the second A/N being scheduled by the second downlink control information; and
a receiver that, when a reception timing of the first A/N is in a same slot as a reception timing of the second A/N, receives for the first A/N and for the second A/N the same uplink control channel in the same slot,
wherein the first A/N and the second A/N are received in the same uplink control channel.