US 12,756,505 B2Granted

Terminal and communication method

AssigneeNtt Docomo, Inc.

InventorsShohei Yoshioka, Satoshi Nagata

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Abstract

A terminal includes: a reception unit configured to receive a grant related to an uplink shared channel from a base station; a control unit configured to determine whether HARQ-ACK (Hybrid automatic repeat request—Acknowledgement) is to be multiplexed with the uplink shared channel in a case where a DAI (Downlink Assignment Index) included in the grant indicates that the HARQ-ACK is to be multiplexed with the uplink shared channel and where a downlink allocation corresponding to the HARQ-ACK that is to be multiplexed with the uplink shared channel is not received; and a transmission unit configured to transmit the uplink shared channel to the base station.

Claims4

Dependent claims

A terminal comprising:

a receiver configured to receive, from a base station, DCI (Downlink Control Information) including a DAI (Downlink Assignment Index) field for scheduling a first uplink shared channel in a certain slot;
a processor configured to determine the first uplink shared channel as a candidate for multiplexing a HARQ-ACK (Hybrid automatic repeat request-Acknowledgement) in a case
where there are a plurality of uplink shared channels in the certain slot,
where the DAI indicates that the HARQ-ACK is to be multiplexed with the first uplink shared channel, and
where there is no uplink control channel corresponding to the HARQ-ACK in the certain slot;
and
a transmitter configured to transmit the first uplink shared channel to the base station,
wherein the processor:
determines the first uplink shared channel as a candidate for multiplexing the HARQ-ACK in a case
where there are a plurality of uplink shared channels in the certain slot,
where the DAI is not four (4) when a type-2 HARQ-ACK codebook is used or the DAI is not zero (0) when a type-1 HARQ-ACK codebook is used, and
where there is no uplink control channel corresponding to the HARQ-ACK in the certain slot, and
determines whether or not to multiplex the HARQ-ACK with the first uplink shared channel, based on a rule for determining a UCI (Uplink Control Information) multiplexing destination, and
determines a candidate for multiplexing the HARQ-ACK
where an uplink shared channel including CSI (Channel State Information) is prioritized over other uplink shared channels,
where a DG (Dynamic Grant)-uplink shared channel is prioritized over a CG (Configured Grant)-uplink shared channel, and
where an uplink shared channel with a smaller serving cell index is prioritized.

14 more elements

A communication system comprising:

a terminal;
and a base station, wherein
the terminal includes:
a first receiver configured to receive, from the base station, DCI (Downlink Control Information) including a DAI (Downlink Assignment Index) field for scheduling a first uplink shared channel in a certain slot;
a first processor configured to determine the first uplink shared channel as a candidate for multiplexing a HARQ-ACK (Hybrid automatic repeat request-Acknowledgement) in a case
where there are a plurality of uplink shared channels in the certain slot,
where the DAI indicates that the HARQ-ACK is to be multiplexed with the first uplink shared channel, and
where there is no uplink control channel corresponding to the HARQ-ACK in the certain slot;
and
a first transmitter configured to transmit the first uplink shared channel to the base station,
wherein the first processor:
determines the first uplink shared channel as a candidate for multiplexing the HARQ-ACK in a case
where there are a plurality of uplink shared channels in the certain slot,
where the DAI is not four (4) when a type-2 HARQ-ACK codebook is used or the DAI is not zero (0) when a type-1 HARQ-ACK codebook is used, and
where there is no uplink control channel corresponding to the HARQ-ACK in the certain slot, and
determines whether or not to multiplex the HARQ-ACK with the first uplink shared channel, based on a rule for determining a UCI (Uplink Control Information) multiplexing destination, and
determines a candidate for multiplexing the HARQ-ACK
where an uplink shared channel including CSI (Channel State Information) is prioritized over other uplink shared channels,
where a DG (Dynamic Grant)-uplink shared channel is prioritized over a CG (Configured Grant)-uplink shared channel, and
where an uplink shared channel with a smaller serving cell index is prioritized, and
the base station includes:
a second transmitter configured to transmit, to the terminal, DCI including the DAI field for scheduling the first uplink shared channel in the certain slot;
a second processor configured to determine the first uplink shared channel as a candidate for multiplexing a HARQ-ACK (Hybrid automatic repeat request-Acknowledgement) in a case
where there are a plurality of uplink shared channels in the certain slot,
where the DAI indicates that the HARQ-ACK is to be multiplexed with the first uplink shared channel, and
where there is no uplink control channel corresponding to the HARQ-ACK in the certain slot;
and
a second receiver configured to receive the first uplink shared channel from the terminal.

25 more elements

Dependencies are inferred from the claim text.

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Abstract