Terminal, radio communication method, and base station
A terminal according to one aspect of the present disclosure has a control section that judges indexing of Physical Downlink Control Channel (PDCCH) monitoring occasions or Downlink Control Information (DCI) formats associated with joint feedback, when the terminal is not provided with any CORESET pool index or is provided with a CORESET pool index with a value of “0” for one or more first control resource sets (COntrol REsource SETs (CORESETs)) and is provided with a CORESET pool index with a value of “1” for one or more second CORESETs on an active Downlink Bandwidth Part (DL BWP) of a serving cell, and Acknowledgement (ACK)/Negative Acknowledgement (ACNACK) feedback mode=joint feedback is provided for the serving cell, and a transmitting section that transmits a HARQ-ACK using a Hybrid Automatic Repeat reQuest (HARQ)-ACK codebook or Physical Uplink Control Channel (PUCCH) resource determined based on the indexing. According to one aspect of the present disclosure, in the case of using multi-panel/TRP, it is possible to suitably perform HARQ-ACK feedback.
1. A terminal comprising:
a receiver that, for a plurality of Physical Downlink Shared Channels (PDSCHs) from a plurality of Transmission/Reception Points (TRPs), receives a higher layer parameter indicating one of a first Acknowledgement (ACK)/Negative Acknowledgement (NACK) feedback for transmitting an individual Hybrid Automatic Repeat reQuest (HARQ)-ACK to each TRP and a second ACK/NACK feedback for transmitting a HARQ-ACK corresponding to the plurality of PDSCHs from the plurality of TRPs to one TRP;
a processor that, if, in an active Downlink Bandwidth Part (DL BWP) of a serving cell, a COntrol REsource SET (CORESET) pool index is not provided or a CORESET pool index with value 0 is provided for one or more first CORESETs and a CORESET pool index with value 1 is provided for one or more second CORESETs, and if the second ACK/NACK feedback is indicated by the higher layer parameter for the serving cell, determines, based on a time domain, an index of Physical Downlink Control Channel (PDCCH) monitoring occasions associated with the second ACK/NACK feedback, and determines indexing of the PDCCH monitoring occasions in ascending order of start times of CORESETs associated with the PDCCH monitoring occasions; and
a transmitter that transmits the HARQ-ACK corresponding to the plurality of PDSCHs by using a HARQ-ACK codebook determined based on the indexing.
2. A radio communication method for a terminal, comprising:
for a plurality of Physical Downlink Shared Channels (PDSCHs) from a plurality of Transmission/Reception Points (TRPs), receiving a higher layer parameter indicating one of a first Acknowledgement (ACK)/Negative Acknowledgement (NACK) feedback for transmitting an individual Hybrid Automatic Repeat reQuest (HARQ)-ACK to each TRP and a second ACK/NACK feedback for transmitting a HARQ-ACK corresponding to the plurality of PDSCHs from the plurality of TRPs to one TRP;
if, in an active Downlink Bandwidth Part (DL BWP) of a serving cell, a COntrol REsource SET (CORESET) pool index is not provided or a CORESET pool index with value 0 is provided for one or more first CORESETs and a CORESET pool index with value 1 is provided for one or more second CORESETs, and if the second ACK/NACK feedback is indicated by the higher layer parameter for the serving cell, determining, based on a time domain, an index of Physical Downlink Control Channel (PDCCH) monitoring occasions associated with the second ACK/NACK feedback, and determining indexing of the PDCCH monitoring occasions in ascending order of start times of CORESETs associated with the PDCCH monitoring occasions; and
transmitting the HARQ-ACK corresponding to the plurality of PDSCHs by using a HARQ-ACK codebook determined based on the indexing.
3. A base station comprising:
a transmitter that, for a plurality of Physical Downlink Shared Channels (PDSCHs) from a plurality of Transmission/Reception Points (TRPs), transmits a higher layer parameter indicating one of a first Acknowledgement (ACK)/Negative Acknowledgement (NACK) feedback for transmitting an individual Hybrid Automatic Repeat reQuest (HARQ)-ACK to each TRP and a second ACK/NACK feedback for transmitting a HARQ-ACK corresponding to the plurality of PDSCHs from the plurality of TRPs to one TRP;
a processor that, if, in an active Downlink Bandwidth Part (DL BWP) of a serving cell, a terminal is not provided with a Control REsource SET (CORESET) pool index or is provided with a CORESET pool index with value 0 for one or more first CORESETs and is provided with a CORESET pool index with value 1 for one or more second CORESETs, and if the second ACK/NACK feedback is indicated by the higher layer parameter for the serving cell, assumes that the terminal determines, based on a time domain, an index of Physical Downlink Control Channel (PDCCH) monitoring occasions associated with the second ACK/NACK feedback and determines indexing of the PDCCH monitoring occasions in ascending order of start times of CORESETs associated with the PDCCH monitoring occasions; and
a receiver that receives the HARQ-ACK, transmitted using a HARQ-ACK codebook determined based on the indexing, corresponding to the plurality of PDSCHs.
4. A system comprising a terminal and a base station, wherein the terminal comprises:
a receiver of the terminal that, for a plurality of Physical Downlink Shared Channels (PDSCHs) from a plurality of Transmission/Reception Points (TRPs), receives a higher layer parameter indicating one of a first Acknowledgement (ACK)/Negative Acknowledgement (NACK) feedback for transmitting an individual Hybrid Automatic Repeat reQuest (HARQ)-ACK to each TRP and a second ACK/NACK feedback for transmitting a HARQ-ACK corresponding to the plurality of PDSCHs from the plurality of TRPs to one TRP;
a processor of the terminal that, if, in an active Downlink Bandwidth Part (DL BWP) of a serving cell, a Control REsource SET (CORESET) pool index is not provided or a CORESET pool index with value 0 is provided for one or more first CORESETs and a CORESET pool index with value 1 is provided for one or more second CORESETs, and if the second ACK/NACK feedback is indicated by the higher layer parameter for the serving cell, determines, based on a time domain, an indexing of Physical Downlink Control Channel (PDCCH) monitoring occasions associated with the second ACK/NACK feedback, and determines indexing of the PDCCH monitoring occasions in ascending order of start times of CORESETs associated with the PDCCH monitoring occasions; and
a transmitter of the terminal that transmits the HARQ-ACK corresponding to the plurality of PDSCHs by using a HARQ-ACK codebook determined based on the indexing, and
the base station comprises:
a transmitter of the base station that transmits the higher layer parameter;
a processor of the base station that assumes that the terminal determines, based on the time domain, the index of the PDCCH monitoring occasions and determines the indexing of the PDCCH monitoring occasions in ascending order of the start times of the CORESETs associated with the PDCCH monitoring occasions; and
a receiver of the base station that receives the HARQ-ACK corresponding to the plurality of PDSCHs.