Timeline and resource assignment for downlink triggered CSI reports
A user equipment (UE) receives downlink communication that triggers a channel state information (CSI) report. Then the UE determines whether to report CSI together with hybrid automatic repeat request (HARQ) feedback. Then the UE transmits the CSI and the HARQ feedback based on the determining whether to report the CSI together with the HARQ feedback.
1 . A method of wireless communication at a user equipment (UE), comprising:
receiving a physical uplink control channel resource indication (PRI) and a time gap between a physical downlink shared channel transmission and a hybrid automatic repeat request (HARQ) feedback,
receiving downlink communication that triggers a channel state information (CSI) report;
determining whether to report CSI together with the HARQ feedback; and
transmitting the CSI and the HARQ feedback based on the determining whether to report the CSI together with the HARQ feedback, wherein the UE transmits the CSI together with the HARQ feedback using resources indicated by the PRI and the time gap.
2 . The method of claim 1 , wherein the UE determines to report the CSI together with the HARQ feedback using a timing for the HARQ feedback based on a relationship between a CSI computation time and the timing for the HARQ feedback, or based on the CSI report being a reduced CSI report, or
wherein the UE determines to report the CSI together with the HARQ feedback using a timing for the CSI feedback, based on the timing for the CSI feedback being greater than a HARQ feedback timing, or based on the timing for the CSI feedback comprising a timeline for reporting the CSI together with the HARQ feedback.
3 . The method of claim 1 , further comprising:
receiving an indication of a reporting mode from a network entity, wherein the UE determines whether to report the CSI together with the HARQ feedback based on the indication of the reporting mode.
4 . The method of claim 3 , wherein the indication is based on at least one of:
a type of a downlink triggered CSI report,
a CSI process identifier (ID),
a modulation and coding scheme used for scheduling a physical downlink shared channel (PDSCH),
the CSI being triggered by a first grant scheduling an initial transmission,
the CSI being triggered by a second grant scheduling a retransmission,
a first number of layers for a PDSCH transmission,
a second number of transport blocks for the PDSCH transmission,
a third number of resource blocks for the PDSCH transmission,
sub-band CSI reporting being configured for the UE, or
wideband CSI reporting being configured for the UE.
5 . The method of claim 1 , wherein the UE determines whether to report the CSI together with the HARQ feedback based on an amount of time between the downlink communication that triggers the CSI report and an uplink control channel resource for transmission of the CSI report.
6 . The method of claim 1 , further comprising:
receiving, in downlink control information (DCI), a physical uplink control channel resource indication (PRI) and a time gap between a physical downlink shared channel (PDSCH) transmission and the HARQ feedback in downlink, wherein the CSI report is triggered by unsuccessful decoding of the PDSCH transmission, and wherein the UE transmits the HARQ feedback using resources indicated by the PRI and the time gap.
7 . The method of claim 1 , further comprising:
receiving an indication of a reporting mode from a network entity, wherein the UE determines whether to report the CSI together with the HARQ feedback based on the indication of the reporting mode; and
receiving, in downlink control information (DCI), at least one physical uplink control channel resource indication (PRI) and at least one time gap, wherein the UE transmits the CSI and the HARQ feedback based on the indication of the reporting mode, the at least one PRI and the at least one time gap.
8 . The method of claim 1 , further comprising:
receiving, in downlink control information (DCI), a first physical uplink control channel resource indication (PRI) and a first time gap, wherein a codepoint of the DCI is associated with a second PRI and a second time gap, and
wherein the UE transmits the CSI report together with the HARQ feedback if the first PRI matches the second PRI and the first time gap matches the second time gap.
9 . A method of wireless communication at a network entity, comprising:
transmitting a physical uplink control channel resource indication (PRI) and a time gap between a physical downlink shared channel transmission and a hybrid automatic repeat request HARQ) feedback;
transmitting downlink communication that triggers a channel state information (CSI) report from a user equipment (UE);
indicating to the UE whether to report CSI together with the HARQ feedback; and
receiving the CSI and the HARQ feedback based on the indication, wherein the network entity receives the CSI together with the HARQ feedback using resources indicated by the PRI and the time gap.
10 . The method of claim 9 , wherein the network entity receives the CSI together with the HARQ feedback using a timing for the HARQ feedback based on a relationship between a CSI computation time and the timing for the HARQ feedback, or based on the CSI report being a reduced CSI report, or
wherein the network entity receives the CSI together with the HARQ feedback using a timing for the CSI feedback based on the timing for the CSI feedback being greater than a HARQ feedback timing, or based on the timing for the CSI feedback comprising a timeline for reporting the CSI together with the HARQ feedback.
11 . The method of claim 9 , wherein the network entity transmits an indication of a reporting mode to the UE, and wherein the network entity receives the CSI together with the HARQ feedback based on the indication of the reporting mode, and wherein the indication is based on at least one of:
a type of a downlink triggered CSI report,
a CSI process identifier (ID),
a modulation and coding scheme used for scheduling a physical downlink shared channel (PDSCH),
the CSI being triggered by a first grant scheduling an initial transmission,
the CSI being triggered by a second grant scheduling a retransmission,
a first number of layers for a PDSCH transmission,
a second number of transport blocks for the PDSCH transmission,
a third number of resource blocks for the PDSCH transmission,
sub-band CSI reporting being configured for the UE, or
wideband CSI reporting being configured for the UE.
12 . The method of claim 9 , further comprising:
transmitting, in downlink control information (DCI), a physical uplink control channel resource indication (PRI) and a time gap between a physical downlink shared channel (PDSCH) transmission and the HARQ feedback in downlink, wherein the CSI report is triggered by unsuccessful decoding of the PDSCH transmission, and wherein the network entity receives the HARQ feedback using resources indicated by the PRI and the time gap.
13 . The method of claim 9 , further comprising:
transmitting, in downlink control information (DCI), a first physical uplink control channel resource indication (PRI) and a first time gap, wherein a codepoint of the DCI is associated with a second PRI and a second time gap, and
wherein the network entity receives the CSI report together with the HARQ feedback if the first PRI matches the second PRI and the first time gap matches the second time gap.
14 . An apparatus for wireless communication at a user equipment (UE), comprising:
a memory; and
a processor coupled to the memory and configurable to:
receive a physical uplink control channel resource indication (PRI) and a time gap between a physical downlink shared channel transmission and a hybrid automatic repeat request (HARQ) feedback;
receive downlink communication that triggers a channel state information (CSI) report;
determine whether to report CSI together with HARQ feedback; and
transmit the CSI and the HARQ feedback based on the determining whether to report the CSI together with the HARQ feedback, wherein the UE transmits the CSI together with the HARQ feedback using resources indicated by the PRI and the time gap.
15 . The apparatus of claim 14 , wherein the UE determines to report the CSI together with the HARQ feedback using a timing for the HARQ feedback based on a relationship between a CSI computation time and the timing for the HARQ feedback, or based on the CSI report being a reduced CSI report, or
wherein the UE determines to report the CSI together with the HARQ feedback using a timing for the CSI feedback, based on the timing for the CSI feedback being greater than a HARQ feedback timing, or based on the timing for the CSI feedback comprising a timeline for reporting the CSI together with the HARQ feedback.
16 . The apparatus of claim 14 , wherein the processor is further configurable to:
receive an indication of a reporting mode from a network entity, wherein the UE determines whether to report the CSI together with the HARQ feedback based on the indication of the reporting mode.
17 . The apparatus of claim 14 , wherein the indication is based on at least one of:
a type of a downlink triggered CSI report,
a CSI process identifier (ID),
a modulation and coding scheme used for scheduling a physical downlink shared channel (PDSCH),
the CSI being triggered by a first grant scheduling an initial transmission,
the CSI being triggered by a second grant scheduling a retransmission,
a first number of layers for a PDSCH transmission,
a second number of transport blocks for the PDSCH transmission,
a third number of resource blocks for the PDSCH transmission,
sub-band CSI reporting being configured for the UE, or
wideband CSI reporting being configured for the UE.
18 . The apparatus of claim 14 , wherein the UE determines whether to report the CSI together with the HARQ feedback based on an amount of time between the downlink communication that triggers the CSI report and an uplink control channel resource for transmission of the CSI report.
19 . The apparatus of claim 14 , wherein the processor is further configurable to:
receive, in downlink control information (DCI), a physical uplink control channel resource indication (PRI) and a time gap between a physical downlink shared channel (PDSCH) transmission and the HARQ feedback in downlink, wherein the CSI report is triggered by unsuccessful decoding of the PDSCH transmission, and wherein the UE transmits the HARQ feedback using resources indicated by the PRI and the time gap.
20 . The apparatus of claim 14 , wherein the processor is further configurable to:
receive an indication of a reporting mode from a network entity, wherein the UE determines whether to report the CSI together with the HARQ feedback based on the indication of the reporting mode; and
receive, in downlink control information (DCI), at least one physical uplink control channel resource indication (PRI) and at least one time gap, wherein the UE transmits the CSI and the HARQ feedback based on the indication of the reporting mode, the at least one PRI and the at least one time gap.
21 . The apparatus of claim 14 , wherein the processor is further configurable to:
receive, in downlink control information (DCI), a first physical uplink control channel resource indication (PRI) and a first time gap, wherein a codepoint of the DCI is associated with a second PRI and a second time gap, and
wherein the UE transmits the CSI report together with the HARQ feedback if the first PRI matches the second PRI and the first time gap matches the second time gap.
22 . An apparatus for wireless communication at a network entity, comprising:
a memory; and
a processor coupled with the memory and configurable to:
transmit a physical uplink control channel resource indication (PRI) and a time gap between a physical downlink shared channel transmission and a hybrid automatic repeat request (HARQ) feedback;
transmit downlink communication that triggers a channel state information (CSI) report from a user equipment (UE);
indicate to the UE whether to report CSI together with the HARQ feedback; and
receive the CSI and the HARQ feedback based on the indication, wherein the network entity receives the CSI together with the HARQ feedback using resources indicated by the PRI and the time gap.
23 . The apparatus of claim 22 , wherein the network entity receives the CSI together with the HARQ feedback using a timing for the HARQ feedback based on a relationship between a CSI computation time and the timing for the HARQ feedback, or based on the CSI report being a reduced CSI report, or
wherein the network entity receives the CSI together with the HARQ feedback using a timing for the CSI feedback based on the timing for the CSI feedback being greater than a HARQ feedback timing, or based on the timing for the CSI feedback comprising a timeline for reporting the CSI together with the HARQ feedback.
24 . The apparatus of claim 22 , wherein the network entity transmits an indication of a reporting mode to the UE, and wherein the network entity receives the CSI together with the HARQ feedback based on the indication of the reporting mode, and wherein the indication is based on at least one of:
a type of a downlink triggered CSI report,
a CSI process identifier (ID),
a modulation and coding scheme used for scheduling a physical downlink shared channel (PDSCH),
the CSI being triggered by a first grant scheduling an initial transmission,
the CSI being triggered by a second grant scheduling a retransmission,
a first number of layers for a PDSCH transmission,
a second number of transport blocks for the PDSCH transmission,
a third number of resource blocks for the PDSCH transmission,
sub-band CSI reporting being configured for the UE, or
wideband CSI reporting being configured for the UE.
25 . The apparatus of claim 22 , wherein the processor is further configurable to:
transmit, in downlink control information (DCI), a physical uplink control channel resource indication (PRI) and a time gap between a physical downlink shared channel (PDSCH) transmission and the HARQ feedback in downlink, wherein the CSI report is triggered by unsuccessful decoding of the PDSCH transmission, and wherein the network entity receives the HARQ feedback using resources indicated by the PRI and the time gap.
26 . The apparatus of claim 22 , wherein the processor is further configurable to:
transmit, in downlink control information (DCI), a first physical uplink control channel resource indication (PRI) and a first time gap, wherein a codepoint of the DCI is associated with a second PRI and a second time gap, and
wherein the network entity receives the CSI report together with the HARQ feedback if the first PRI matches the second PRI and the first time gap matches the second time gap.