Code block-based resource mapping for transmissions with data-modulated demodulation reference signals
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may map a code block to resources, of a physical shared channel, that are allocated for data-modulated demodulation reference signals (DMRSs) in which each of the resources carries both at least a portion of a DMRS sequence and data. The wireless communication device may transmit a communication, via the physical shared channel, that includes the code block that is mapped to the resources that are allocated for the data-modulated DMRSs. Numerous other aspects are provided.
1. A wireless communication device for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
map a code block to a first set of resource elements of a physical shared channel, wherein the first set of resource elements comprises resources allocated for data-modulated demodulation reference signals (DMRSs), and wherein the physical shared channel includes a second set of resource elements allocated for only data;
determine a first modulation and coding scheme (MCS) based at least in part on one or more of:
a configured MCS of the data-modulated DMRSs, or
a configured difference between the first MCS and a second MCS; and
transmit a communication, via the physical shared channel, that includes the code block, wherein the first MCS of the first set of resource elements is different from the second MCS of the second set of resource elements.
2. The wireless communication device of claim 1 , wherein the one or more processors are further configured to one or more of:
receive a request to map the code block to the first set of resource elements; or
transmit an indication that the first set of resource elements are mapped to the code block.
3. The wireless communication device of claim 1 , wherein the code block has a size that is different than a size of one or more code blocks that are mapped to the second set of resource elements, and
wherein the size of the code block is based at least in part on one or more of:
a quantity of resource elements of the first set of resource elements, or
the first MCS.
4. The wireless communication device of claim 1 , wherein the one or more processors are further configured to:
transmit an indication of the first MCS; or
receive an indication of the first MCS.
5. The wireless communication device of claim 4 , wherein the one or more processors, to transmit the indication of the first MCS, are configured to transmit the indication of the first MCS with an indication that the communication is to be transmitted with the data-modulated DMRSs, or
wherein the one or more processors, to receive the indication of the first MCS, are configured to receive the indication of the first MCS with an indication that the communication is to be transmitted with the data-modulated DMRSs.
6. The wireless communication device of claim 5 , wherein the indication of the first MCS indicates a difference between the first MCS and the second MCS.
7. The wireless communication device of claim 1 , wherein the first MCS is lower than the second MCS.
8. The wireless communication device of claim 1 , wherein the one or more processors are further configured to map an additional code block to additional resources, of the physical shared channel, that are allocated for the data-modulated DMRSs.
9. The wireless communication device of claim 1 , wherein the one or more processors are further configured to one or more of:
determine one or more of a quantity of resource elements of the first set of resource elements or a pattern of the data-modulated DMRSs based at least in part on receiving one or more of configuration information, downlink control information (DCI), radio resource control (RRC) signaling, or one or more medium access control control elements (MAC CEs); or
indicate one or more of the quantity or the pattern of the data-modulated DMRSs via one or more of configuration information, DCI, RRC signaling, or one or more MAC CEs.
10. The wireless communication device of claim 1 , wherein the one or more processors are further configured to map the code block to a code block group that does not include any code blocks that are mapped to the second set of resource elements.
11. The wireless communication device of claim 1 , wherein the one or more processors are further configured to:
receive hybrid automatic repeat request (HARQ) feedback for a code block group; and
transmit, based at least in part on receiving negative acknowledgement (NACK) feedback for the code block group, a retransmission of the data-modulated DMRSs in a subsequent retransmission of the communication, or
transmit, based at least in part on receiving acknowledgement (ACK) feedback for the code block group, a subsequent retransmission of the communication with DMRSs that are not data-modulated.
12. The wireless communication device of claim 1 , wherein the one or more processors are further configured to transmit a retransmission of the data-modulated DMRSs in a subsequent retransmission of the communication based at least in part on:
receiving negative acknowledgement (NACK) feedback for at least one code block group that is mapped to the second set of resource elements,
receiving NACK feedback for a quantity of code block groups that are mapped to the second set of resource elements, the quantity satisfying a threshold, or
receiving NACK feedback for all code block groups that are mapped to the second set of resource elements.
13. A wireless communication device for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
determine a mapping of a code block to a first set of resource elements of a physical shared channel, wherein the first set of resource elements comprises resources allocated for data-modulated demodulation reference signals (DMRSs), and wherein the physical shared channel includes a second set of resource elements allocated for only data;
determine a first modulation and coding scheme (MCS) based at least in part on one or more of:
a configured MCS of the data-modulated DMRSs, or
a configured difference of the first MCS and a second MCS; and
receive a communication, via the physical shared channel, that includes the code block, wherein the first MCS of the first set of resource elements is different from the second MCS of the second set of resource elements.
14. The wireless communication device of claim 13 , wherein the one or more processors are further configured to:
perform a first stage channel estimation for the communication based at least in part on one or more DMRSs of the communication that are not data-modulated;
perform channel decoding of the code block that is mapped to the first set of resource elements;
perform, based at least in part on successful channel decoding of the code block, second stage channel estimation for the physical shared channel based at least in part on a reconstruction of the first set of resource elements; and
decode the communication based at least in part on the second stage channel estimation.
15. The wireless communication device of claim 13 , wherein the one or more processors are further configured to:
perform a first stage channel estimation for the communication based at least in part on one or more DMRSs of the communication that are not data-modulated;
perform channel decoding of the code block that is mapped to the first set of resource elements; and
decode, based at least in part on unsuccessful channel decoding of the code block, a transmission based at least in part on the first stage channel estimation.
16. The wireless communication device of claim 13 , wherein the one or more processors are further configured to one or more of:
transmit a request to map the code block to the first set of resource elements; or
receive an indication that the first set of resource elements are mapped to the code block.
17. The wireless communication device of claim 13 , wherein the code block has a size that is different from a size of one or more code blocks that are mapped to the second set of resource elements, and
wherein the size of the code block is based at least in part on one or more of:
a quantity of resource elements of the first set of resource elements, or the first MCS.
18. The wireless communication device of claim 13 , wherein the one or more processors are further configured to:
transmit an indication of the first MCS; or
receive an indication of the first MCS.
19. The wireless communication device of claim 18 , wherein the one or more processors, to transmit the indication of the first MCS, are configured to transmit the indication of the first MCS with an indication that the communication is to be transmitted with data-modulated DMRSs, or
wherein the one or more processors, to receive the indication of the first MCS, are configured to receive the indication of the first MCS with an indication that the communication is to be transmitted with data-modulated DMRSs.
20. The wireless communication device of claim 19 , wherein the indication of the first MCS indicates a difference between the first MCS and the second MCS.
21. The wireless communication device of claim 13 , wherein the one or more processors are further configured to determine a mapping of an additional code block to additional resources, of the physical shared channel, that are allocated for the data-modulated DMRSs.
22. The wireless communication device of claim 13 , wherein the one or more processors are further configured to map the code block to a code block group that does not include any code blocks that are mapped to the second set of resource elements.
23. The wireless communication device of claim 13 , wherein the one or more processors are further configured to:
transmit hybrid automatic repeat request (HARQ) feedback for a code block group; and
receive, based at least in part on transmitting negative acknowledgement (NACK) feedback for the code block group, a retransmission of the data-modulated DMRSs in a subsequent retransmission of the communication, or
receive, based at least in part on transmitting acknowledgement (ACK) feedback for the code block group, a subsequent retransmission of the communication with DMRSs that are not data-modulated.
24. The wireless communication device of claim 13 , wherein the one or more processors are further configured to receive a retransmission of the data-modulated DMRSs in a subsequent retransmission of the communication based at least in part on:
transmitting negative acknowledgement (NACK) feedback for at least one code block group that is mapped to the second set of resource elements,
transmitting NACK feedback for a quantity of code block groups that are mapped to the second set of resource elements, the quantity satisfying a threshold, or
transmitting NACK feedback for all code block groups that are mapped to the second set of resource elements.
25. A method of wireless communication performed by a wireless communication device, comprising:
mapping a code block to a first set of resource elements of a physical shared channel, wherein the first set of resource elements comprises resources allocated for data-modulated demodulation reference signals (DMRSs), and wherein the physical shared channel includes a second set of resource elements allocated for only data;
determining a first modulation and coding scheme (MCS) based at least in part on one or more of:
a configured MCS of the data-modulated DMRSs, or
a configured difference of the first MCS and a second MCS; and
transmitting a communication, via the physical shared channel, that includes the code block, wherein the first MCS of the first set of resource elements is different from the second MCS of the second set of resource elements.
26. The method of claim 25 , further comprising mapping the code block to a code block group that does not include any code blocks that are mapped to the second set of resource elements.
27. A method of wireless communication performed by a wireless communication device, comprising:
determining a mapping of a code block to a first set of resource elements of a physical shared channel, wherein the first set of resource elements comprises resources allocated for data-modulated demodulation reference signals (DMRSs), and wherein the physical shared channel includes a second set of resource elements allocated for only data;
determining a first modulation and coding scheme (MCS) based at least in part on one or more of:
a configured MCS of the data-modulated DMRSs, or
a configured difference of the first MCS and a second MCS; and
receiving a communication, via the physical shared channel, that includes the code block, wherein the first MCS of the first set of resource elements is different from the second MCS of the second set of resource elements.
28. The method of claim 27 , further comprising mapping the code block to a code block group that does not include any code blocks that are mapped to the second set of resource elements.