Feedback codebook size based on control channel monitoring occasions
Methods, systems, and devices for wireless communications are described. The described techniques provide for a user equipment (UE) transmitting feedback according to a codebook size, where the codebook size is determined according to a quantity of physical downlink control channel (PDCCH) monitoring occasions (PMOs) that occur before a feedback slot for transmitting the codebook. The UE may generate feedback according to a codebook that includes an entry corresponding to each PMO, which may indicate the feedback associated with the corresponding PMO. For example, if the UE receives a downlink control information (DCI) message during a PMO, the UE may set a corresponding feedback bit according to a decoding result of a transmission scheduled by the DCI.
1 . A user equipment (UE) for wireless communications, comprising:
one or more processors;
memory coupled with the one or more processors; and
instructions stored in the memory and executable by the one or more processors to:
receive, in a first time slot, a first downlink control information message indicating a second time slot for the UE to transmit feedback according to a codebook size;
monitor a first set of one or more physical downlink control channel monitoring occasions within at least a subset of a plurality of time slots that occur before the second time slot based at least in part on the first downlink control information message; and
transmit first feedback according to a first codebook size in the second time slot in response to the first downlink control information message, wherein the first codebook size of the first feedback is based at least in part on a first quantity of the first set of one or more physical downlink control channel monitoring occasions that occur within at least the subset of the plurality of time slots, and wherein each entry of the first feedback corresponds to a respective physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions.
2 . The UE of claim 1 , wherein the instructions to monitor the first set of one or more physical downlink control channel monitoring occasions are executable by the one or more processors to:
receive, during a first physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions, a second downlink control information message that schedules a physical downlink shared channel transmission, wherein a first entry of the first feedback indicates an acknowledgement or a negative acknowledgement according to a decoding result of the physical downlink shared channel transmission, the first entry corresponding to the first physical downlink control channel monitoring occasion.
3 . The UE of claim 1 , wherein the instructions to monitor the first set of one or more physical downlink control channel monitoring occasions are executable by the one or more processors to:
receive, during a first physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions, a second downlink control information message, wherein a first entry of the first feedback indicates an acknowledgement based at least in part on the second downlink control information message not scheduling a data transmission, the first entry corresponding to the first physical downlink control channel monitoring occasion.
4 . The UE of claim 1 , wherein a first entry of the first feedback indicates a negative acknowledgement based at least in part on not receiving control information during a first physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions, the first entry corresponding to the first physical downlink control channel monitoring occasion.
5 . The UE of claim 1 , wherein each physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions does not overlap with a semi-static uplink symbol in a time domain duplexing pattern.
6 . The UE of claim 1 , wherein each physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions is associated with a downlink control information format associated with feedback transmission.
7 . The UE of claim 1 , wherein the instructions are further executable by the one or more processors to:
transmit a capability report indicating a capability of the UE to use a first type of feedback codebook that has the first codebook size that corresponds to a quantity of physical downlink control channel monitoring occasions, wherein the first feedback is in accordance with the first type of feedback codebook; and
receive, based at least in part on transmitting the capability report, radio resource control signaling indicating a configuration for the first type of feedback codebook, wherein the configuration is associated with a cell group of the UE, a component carrier of the UE, or both.
8 . The UE of claim 1 , wherein the instructions are further executable by the one or more processors to:
receive control information indicating a first set of slot offset values and a second set of slot offset values, wherein the subset of the plurality of time slots is based at least in part on the first set of slot offset values and the second set of slot offset values.
9 . The UE of claim 1 , wherein the instructions are further executable by the one or more processors to:
receive an indication of a plurality of slot offset values, wherein the first set of one or more physical downlink control channel monitoring occasions within at least the subset of the plurality of time slots that occur before the second time slot is based at least in part on the plurality of slot offset values.
10 . The UE of claim 9 , wherein the instructions are further executable by the one or more processors to:
receive, during a first physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions, a second downlink control information message that schedules a physical downlink control channel transmission and indicates a first slot offset value of the plurality of slot offset values, the first slot offset value indicating a quantity of time slots between a third time slot associated with the first physical downlink control channel monitoring occasion and the second time slot.
11 . The UE of claim 1 , wherein each entry of the first feedback comprises a quantity of bits corresponding to a quantity of codewords configured for data channel reception by the UE.
12 . The UE of claim 11 , wherein the quantity of bits is two bits comprising a first bit and a second bit, and wherein:
the first bit and the second bit each indicate negative acknowledgement based at least in part on not receiving control information during a corresponding physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions; or
the first bit indicates a decoding result of a first codeword and the second bit indicates a negative acknowledgement based at least in part on receiving a second downlink control information message during the corresponding physical downlink control channel monitoring occasion and the second downlink control information message scheduling a single codeword, the single codeword comprising the first codeword; or
the first bit indicates an acknowledgement and second bit indicates an acknowledgement or a negative acknowledgement based at least in part on receiving the second downlink control information message during the corresponding physical downlink control channel monitoring occasion and the second downlink control information message not scheduling a data transmission.
13 . The UE of claim 1 , wherein each entry of the first feedback comprises a quantity of bits corresponding to a quantity of code block groups configured for data channel reception by the UE.
14 . The UE of claim 13 , wherein:
each bit of the quantity of bits indicates a negative acknowledgement based at least in part on not receiving control information during a corresponding physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions; or
a first subset of the quantity of bits indicates an acknowledgement or a negative acknowledgement and second subset of the quantity of bits indicates a negative acknowledgement based at least in part on receiving a second downlink control information message during the corresponding physical downlink control channel monitoring occasion and the second downlink control information message scheduling a second quantity of code block groups that is less than the quantity of code block groups configured for data channel reception by the UE; or
a first bit of the quantity of bits indicates an acknowledgment and one or more remaining bits of the quantity of bits indicates an acknowledgement or a negative acknowledgement based at least in part on receiving the second downlink control information message during the corresponding physical downlink control channel monitoring occasion and the second downlink control information message not scheduling a data transmission.
15 . A network entity for wireless communications, comprising:
one or more processors;
memory coupled with the one or more processors; and
instructions stored in the memory and executable by the one or more processors to:
transmit, in a first time slot, a first downlink control information message indicating a second time slot for a user equipment (UE) to transmit feedback according to a codebook size; and
receive first feedback according to a first codebook size in the second time slot based at least in part on the first downlink control information message, wherein the first codebook size of the first feedback is based at least in part on a first quantity of a first set of one or more physical downlink control channel monitoring occasions that occur within at least a subset of a plurality of time slots that occur before the second time slot, and wherein each entry of the first feedback corresponds to a respective physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions.
16 . The network entity of claim 15 , wherein the instructions are further executable by the one or more processors to:
receive a capability report indicating a capability of the UE to use a first type of feedback codebook that has the first codebook size that corresponds to a quantity of physical downlink control channel monitoring occasions, wherein the first feedback is in accordance with the first type of feedback codebook; and
transmit, based at least in part on receiving the capability report, radio resource control signaling indicating a configuration for the first type of feedback codebook, wherein the configuration is associated with a cell group of the UE, a component carrier of the UE, or both.
17 . The network entity of claim 15 , wherein the instructions are further executable by the one or more processors to:
transmit control information indicating a first set of slot offset values and a second set of slot offset values, wherein the subset of the plurality of time slots is based at least in part on the first set of slot offset values and the second set of slot offset values.
18 . The network entity of claim 15 , wherein the instructions are further executable by the one or more processors to:
transmit an indication of a plurality of slot offset values, wherein the first set of one or more physical downlink control channel monitoring occasions within at least the subset of the plurality of time slots that occur before the second time slot is based at least in part on the plurality of slot offset values.
19 . The network entity of claim 18 , wherein the instructions are further executable by the one or more processors to:
transmit, during a first physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions, a second downlink control information message that schedules a physical downlink control channel transmission and indicates a first slot offset value of the plurality of slot offset values, the first slot offset value indicating a quantity of time slots between a third time slot associated with the first physical downlink control channel monitoring occasion and the second time slot.
20 . A method for wireless communications at a user equipment (UE), comprising:
receiving, in a first time slot, a first downlink control information message indicating a second time slot for the UE to transmit feedback according to a codebook size;
monitoring a first set of one or more physical downlink control channel monitoring occasions within at least a subset of a plurality of time slots that occur before the second time slot based at least in part on the first downlink control information message; and
transmitting first feedback according to a first codebook size in the second time slot in response to the first downlink control information message, wherein the first codebook size of the first feedback is based at least in part on a first quantity of the first set of one or more physical downlink control channel monitoring occasions that occur within at least the subset of the plurality of time slots, and wherein each entry of the first feedback corresponds to a respective physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions.
21 . A method for wireless communications at a network entity, comprising:
transmitting, in a first time slot, a first downlink control information message indicating a second time slot for a user equipment (UE) to transmit feedback according to a codebook size; and
receiving first feedback according to a first codebook size in the second time slot based at least in part on the first downlink control information message, wherein the first codebook size of the first feedback is based at least in part on a first quantity of a first set of one or more physical downlink control channel monitoring occasions that occur within at least a subset of a plurality of time slots that occur before the second time slot, and wherein each entry of the first feedback corresponds to a respective physical downlink control channel monitoring occasion of the first set of one or more physical downlink control channel monitoring occasions.