Tri-state hybrid automatic repeat request feedback
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, an apparatus for wireless communication at a wireless node comprises one or more memories, and one or more processors, coupled to the memory. The one or more processors can be configured to transmit or receive tri-state feedback indicating a result of decoding one or more communications. The tri-state feedback can be associated with three potential states. The three potential states can indicate whether (i) decoding of a control channel was unsuccessful, (ii) decoding of the control channel was successful and decoding of a data channel was unsuccessful, or (iii) decoding of the control channel and the data channel was successful.
1. An apparatus for wireless communication at a wireless node, comprising:
one or more memories;
a transceiver; and
one or more processors, coupled to the one or more memories and the transceiver, configured to:
transmit, via the transceiver, tri-state feedback indicating a result of decoding one or more communications,
wherein the tri-state feedback is associated with three potential states, the three potential states indicating whether (i) decoding of a control channel was unsuccessful, (ii) decoding of the control channel was successful and decoding of a data channel was unsuccessful, or (iii) decoding of the control channel and the data channel was successful.
2. The apparatus of claim 1 , wherein the one or more processors are further configured to:
transmit, via the transceiver, capability information indicating that the wireless node supports the tri-state feedback; and
receive, via the transceiver, configuration information indicating to provide the tri-state feedback.
3. The apparatus of claim 1 , wherein the one or more processors are configured to transmit the tri-state feedback based at least in part on the tri-state feedback being generated using an ultra-reliable low-latency communication (URLLC) feedback codebook.
4. The apparatus of claim 1 , wherein the one or more processors are configured to transmit the tri-state feedback based at least in part on a high-reliability block error rate (BLER) table being used to determine a modulation and coding scheme (MCS) or channel quality indicator (CQI) associated with the data channel.
5. The apparatus of claim 1 , wherein the one or more processors are configured to transmit the tri-state feedback based at least in part on the one or more communications being associated with a single transport block.
6. The apparatus of claim 1 , wherein the one or more processors are configured to transmit the tri-state feedback based at least in part on the one or more communications being configured without a code block group (CBG) based shared channel.
7. The apparatus of claim 1 , wherein the one or more processors are configured to transmit the tri-state feedback based at least in part on the one or more communications including multiple transport blocks or multiple shared channels.
8. The apparatus of claim 7 , wherein the one or more communications are a first communication, and wherein the one or more processors are further configured to:
transmit, via the transceiver, bi-state feedback based at least in part on a second communication including a single transport block or a single shared channel, wherein the bi-state feedback indicates whether decoding of a data channel of the second communication was successful or unsuccessful.
9. The apparatus of claim 1 , wherein the tri-state feedback is generated based at least in part on a codebook generated based at least in part on a plurality of orthogonal sequences, wherein the codebook is generated based at least in part on an exponential expression with base 3 .
10. The apparatus of claim 9 , wherein the one or more processors are further configured to:
generate the tri-state feedback using the codebook based at least in part on converting a set of ternary feedback values to a decimal value and selecting a codeword from the codebook based at least in part on the decimal value.
11. The apparatus of claim 1 , wherein the one or more processors are further configured to:
receive, via the transceiver, the one or more communications on a code block group (CBG) based data channel including one or more CBGs, and
wherein the tri-state feedback includes:
a bi-state feedback value for each CBG of the one or more CBGs indicating whether decoding of each CBG was successful or unsuccessful, and
a feedback value indicating whether decoding of the control channel was successful or unsuccessful, wherein the control channel is associated with the one or more CBGs.
12. The apparatus of claim 11 , wherein the one or more processors are further configured to:
map the bi-state feedback value and the feedback value to corresponding sequence indices of a plurality of orthogonal sequences of a codebook.
13. An apparatus for wireless communication at a wireless node, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
receive tri-state feedback indicating a result of decoding one or more communications,
wherein the tri-state feedback is associated with three potential states, the three potential states indicating whether (i) decoding of a control channel was unsuccessful, (ii) decoding of the control channel was successful and decoding of a data channel was unsuccessful, or (iii) decoding of the control channel and the data channel was successful.
14. The apparatus of claim 13 , wherein the one or more communications are a first communication and the tri-state feedback indicates that decoding of the control channel was unsuccessful, and wherein the one or more processors are further configured to:
transmit a second communication using a modified control channel configuration relative to the first communication based at least in part on the tri-state feedback indicating that decoding of the control channel was unsuccessful.
15. The apparatus of claim 14 , wherein the modified control channel configuration is based at least in part on feedback indicating that decoding of another control channel, transmitted using the modified control channel configuration, was successful.
16. The apparatus of claim 13 , wherein the tri-state feedback is based at least in part on the one or more communications being associated with a single transport block.
17. The apparatus of claim 13 , wherein the tri-state feedback is based at least in part on the one or more communications being configured without a code block group (CBG) based shared channel.
18. The apparatus of claim 13 , wherein the tri-state feedback is based at least in part on the one or more communications including multiple transport blocks or multiple shared channels.
19. The apparatus of claim 18 , wherein the one or more communications are a first communication, and wherein the one or more processors are further configured to:
receive bi-state feedback based at least in part on a second communication including a single transport block or a single shared channel, wherein the bi-state feedback indicates whether decoding of a data channel of the second communication was successful or unsuccessful.
20. The apparatus of claim 13 , wherein the tri-state feedback is based at least in part on a codebook generated based at least in part on a plurality of orthogonal sequences, wherein the codebook is generated based at least in part on an exponential expression with base 3 .
21. The apparatus of claim 13 , wherein the one or more processors are further configured to:
transmit the one or more communications on a code block group (CBG) based data channel including one or more CBGs, and
wherein the tri-state feedback includes:
a bi-state feedback value for each CBG of the one or more CBGs indicating whether decoding of each CBG was successful or unsuccessful, and
a feedback value indicating whether decoding of the control channel was successful or unsuccessful, wherein the control channel is associated with the one or more CBGs.
22. A method of wireless communication performed by a wireless node, comprising:
transmitting tri-state feedback indicating a result of decoding one or more communications,
wherein the tri-state feedback is associated with three potential states, the three potential states indicating whether (i) decoding of a control channel was unsuccessful, (ii) decoding of the control channel was successful and decoding of a data channel was unsuccessful, or (iii) decoding of the control channel and the data channel was successful.
23. The method of claim 22 , further comprising:
transmitting capability information indicating that the wireless node supports the tri-state feedback; and
receiving configuration information indicating to provide the tri-state feedback.
24. The method of claim 23 , wherein at least one of the capability information or the configuration information is specific to a downlink component carrier (CC).
25. The method of claim 23 , wherein at least one of the capability information or the configuration information is specific to the wireless node.
26. The method of claim 22 , wherein the tri-state feedback is generated based at least in part on a codebook generated based at least in part on a plurality of orthogonal sequences, wherein the codebook is generated based at least in part on an exponential expression with base 3 .
27. The method of claim 22 , further comprising:
receiving the one or more communications on a code block group (CBG) based data channel including one or more CBGs, and
wherein the tri-state feedback includes:
a bi-state feedback value for each CBG of the one or more CBGs indicating whether decoding of each CBG was successful or unsuccessful, and
a feedback value indicating whether decoding of the control channel was successful or unsuccessful, wherein the control channel is associated with the one or more CBGs.
28. A method of wireless communication performed by a wireless node, comprising:
receiving tri-state feedback indicating a result of decoding one or more communications,
wherein the tri-state feedback is associated with three potential states, the three potential states indicating whether (i) decoding of a control channel was unsuccessful, (ii) decoding of the control channel was successful and decoding of a data channel was unsuccessful, or (iii) decoding of the control channel and the data channel was successful.
29. The method of claim 28 , wherein the one or more communications are a first communication and the tri-state feedback indicates that decoding of the control channel was unsuccessful, and wherein the method further comprises:
transmitting a second communication using a modified control channel configuration relative to the first communication based at least in part on the tri-state feedback indicating that decoding of the control channel was unsuccessful.
30. The method of claim 29 , wherein the modified control channel configuration is based at least in part on feedback indicating that decoding of another control channel, transmitted using the modified control channel configuration, was successful.