Subband-specific codebook subset restriction
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a first configuration of one or more channel state information reference signal resources and a second configuration of a channel state information report associated with the one or more channel state information reference signal resources. In some cases, the second configuration may include at least one of an indication of a codebook, a set of codebook restriction sets, and a configured bandwidth. The UE may then identify a mapping between one or more frequency-domain subbands of the configured bandwidth and each codebook restriction set of the set of codebook restriction sets, and transmit, to the base station, a report indicating one or more precoding matrix indicators from the codebook for each of the one or more frequency-domain subbands based on the mapping.
1. An apparatus for wireless communication, comprising:
a processor; and
memory coupled with the processor, wherein the processor is configured to:
receive a first configuration of one or more channel state information reference signal resources;
receive a second configuration of a channel state information report associated with the one or more channel state information reference signal resources, the second configuration comprising at least one of an indication of a codebook, a plurality of codebook restriction sets, and a configured bandwidth;
identify, based at least in part on a configuration of a time period for downlink transmissions, an uplink portion within the time period and a downlink portion within the time period; and
transmit, based at least in part on a mapping between one or more frequency-domain subbands of the configured bandwidth and each codebook restriction set of the plurality of codebook restriction sets, a report indicating one or more precoding matrix indicators from the codebook for each of the one or more frequency-domain subbands, wherein the mapping is based at least in part on the uplink portion and the downlink portion, and wherein the mapping includes:
a first mapping between a first codebook restriction set and a threshold number of physical resource blocks from the uplink portion within the time period, and
a second mapping between a second codebook restriction set and a remaining number of physical resource blocks within the time period.
2. The apparatus of claim 1 , wherein the processor is configured to:
receive a signal indicating the threshold number of physical resource blocks.
3. The apparatus of claim 1 , wherein the uplink portion comprises an uplink bandwidth part and the downlink portion comprises a downlink bandwidth part.
4. The apparatus of claim 1 , wherein the uplink portion and the downlink portion are concurrently included in the same component carrier and the same symbol.
5. The apparatus of claim 1 ,
wherein the mapping is based at least in part on a boundary between the uplink portion and the downlink portion.
6. The apparatus of claim 5 , wherein the first set of physical resource blocks and the second set of physical resource blocks are associated with a component carrier.
7. The apparatus of claim 1 , wherein a plurality of frequency-domain subbands is associated with a downlink bandwidth part, wherein the mapping is based at least in part on the plurality of frequency-domain subbands.
8. The apparatus of claim 7 , wherein
the mapping is based at least in part on the plurality of frequency-domain subbands.
9. The apparatus of claim 1 , wherein the processor is configured to:
receive a control message, wherein the plurality of codebook restriction sets is based at least in part on the control message.
10. The apparatus of claim 9 , wherein the mapping is based at least in part on one or more bits of the control message.
11. The apparatus of claim 9 , wherein the control message comprises at least one of downlink control information, a media access control (MAC) control element, or a combination thereof.
12. The apparatus of claim 1 , wherein the processor is configured to:
receive a control message; and
update the mapping based at least in part on the control message.
13. The apparatus of claim 1 , wherein the processor is configured to:
transmit a capability message indicating a capability of the apparatus to support the plurality of codebook restriction sets, wherein the mapping is based at least in part on the capability message.
14. The apparatus of claim 1 , wherein the plurality of codebook restriction sets is associated with at least one of a single panel codebook, a multi-panel codebook, or a combination thereof.
15. The apparatus of claim 1 , wherein the report is associated with full-duplex communication.
16. The apparatus of claim 1 , wherein the one or more frequency-domain subbands of the configured bandwidth are contiguous.
17. The apparatus of claim 1 , wherein the one or more frequency-domain subbands of the configured bandwidth are non-contiguous.
18. An apparatus for wireless communication, comprising:
a processor; and
memory coupled with the processor, wherein the processor is configured to:
receive a first configuration of one or more channel state information reference signal resources;
receive a second configuration of a channel state information report associated with the one or more channel state information reference signal resources, the second configuration comprising at least one of an indication of a codebook, a plurality of codebook restriction sets, and a configured bandwidth;
identify, based at least in part on a configuration of a time period for downlink transmissions, a first set of physical resource blocks associated with an uplink portion;
identify, based at least in part on the configuration of the time period, a second set of physical resource blocks associated with a downlink portion; and
transmit, based at least in part on a mapping between one or more frequency-domain subbands of the configured bandwidth and each codebook restriction set of the plurality of codebook restriction sets, a report indicating one or more precoding matrix indicators from the codebook for each of the one or more frequency-domain subbands, wherein the mapping is based at least in part on a boundary between the uplink portion and the downlink portion, and wherein the mapping includes:
a first mapping between a first codebook restriction set and a subset of the second set of physical resource blocks located within a threshold distance from the boundary between the uplink portion and the downlink portion; and
a second mapping between a second codebook restriction set and a remaining number of the second set of physical resource blocks within the time period.
19. An apparatus for wireless communication, comprising:
a processor; and
memory coupled with the processor, wherein the processor is configured to:
receive a first configuration of one or more channel state information reference signal resources;
receive a second configuration of a channel state information report associated with the one or more channel state information reference signal resources, the second configuration comprising at least one of an indication of a codebook, a plurality of codebook restriction sets, and a configured bandwidth;
identify, based at least in part on a configuration of a time period for downlink transmissions, a guard band within the time period;
determine a threshold number of physical resource blocks from the guard band within the time period; and
transmit, based at least in part on a mapping between one or more frequency-domain subbands of the configured bandwidth and each codebook restriction set of the plurality of codebook restriction sets, a report indicating one or more precoding matrix indicators from the codebook for each of the one or more frequency-domain subbands, wherein the mapping is based at least in part on the guard band, and wherein the mapping includes:
a first mapping between a first codebook restriction set and the threshold number of physical resource blocks from the guard band within the time period; and
a second mapping between a second codebook restriction set and a remaining number of physical resource blocks within the time period.