Redundancy gap indication for improved data transmission
Techniques discussed herein can facilitate successful decoding of Physical Downlink Shared Channel (PDSCH) based on a reduced number of retransmissions. Based on a given PDSCH, embodiments discussed herein can communicate feedback (e.g., Hybrid Automatic Repeat reQuest (HARQ) feedback, Channel State Information (CSI) feedback) that indicates an amount of additional information that can allow a User Equipment (UE) to successfully decode the PDSCH. In some embodiments, the feedback can indicate a requested Redundancy Version (RV) sequence that can allow the UE to successfully decode the PDSCH. In other embodiments, the feedback can indicate the amount of additional information, based on which a receiving Base Station (BS) can select a RV sequence.
1. An apparatus configured to be employed in a User Equipment (UE), comprising:
one or more processors configured to:
process an initial Physical Downlink Shared Channel (PDSCH) transmission comprising one or more Redundancy Versions (RVs) of a Transport Block (TB);
based at least on the initial PDSCH transmission, make a determination of whether the TB was received correctly; and
in response to a determination that the TB was not received correctly, generate Hybrid Automatic Repeat reQuest (HARQ) feedback that indicates a requested RV sequence for the TB, wherein the requested RV sequence is indicated based at least on an indication of a length of a basic RV sequence.
2. The apparatus of claim 1 , wherein the one or more processors are further configured to process a PDSCH retransmission comprising the requested RV sequence for the TB.
3. The apparatus of claim 1 , wherein the one or more processors are configured to select the requested RV sequence based at least on a calculation of a number of additional coded bits to decode the TB based on a set of transmission parameters associated with the initial PDSCH transmission or retransmission.
4. The apparatus of claim 1 , wherein the requested RV sequence is indicated based at least on an explicit indication of each RV of the requested RV sequence.
5. The apparatus of claim 4 , wherein the one or more processors are further configured to select each RV of the requested RV sequence as one of a RV 0, a RV 1, a RV 2, or a RV 3.
6. The apparatus of claim 4 , wherein the one or more processors are further configured to select each RV of the requested RV sequence as an element of a set of three or fewer of RV 0, a RV 1, a RV 2, or a RV 3.
7. The apparatus of claim 1 , wherein the requested RV sequence is indicated based at least on an indication of a starting RV of a basic RV sequence.
8. The apparatus of claim 1 , wherein the basic RV sequence is predefined.
9. The apparatus of claim 1 , wherein the basic RV sequence is configured via one or more of Radio Resource Control (RRC) signaling or a Medium Access Control (MAC) Control Element (CE).
10. The apparatus of claim 1 , wherein the requested RV sequence is indicated based at least on an indication of a starting RV and an indication of a multiple of a number of coded bits of a reference transmission.
11. The apparatus of claim 1 , wherein the requested RV sequence in the HARQ feedback includes multiple RVs to be transmitted at different times within the requested RV sequence.
12. An apparatus configured to be employed in a Base Station (BS), comprising:
one or more processors configured to:
generate an initial Physical Downlink Shared Channel (PDSCH) transmission comprising one or more Redundancy Versions (RVs) of a Transport Block (TB);
process Hybrid Automatic Repeat reQuest (HARQ) feedback that indicates a requested RV sequence for the TB, the requested RV sequence in the HARQ feedback including multiple RVs to be transmitted at different times within the requested RV sequence, wherein the requested RV sequence is indicated based at least on an indication of a length of a basic RV sequence; and
generate a PDSCH retransmission that comprises the requested RV sequence for the TB.
13. The apparatus of claim 12 , wherein the requested RV sequence is indicated based at least on an indication of a starting RV and an indication of a multiple of a number of coded bits of a reference transmission.
14. An apparatus configured to be employed in a User Equipment (UE), comprising:
one or more processors configured to:
process a reference Physical Downlink Shared Channel (PDSCH) transmission comprising one or more Redundancy Versions (RVs) of a Transport Block (TB);
process a Downlink Control Information (DCI) that triggers a Channel State Information (CSI) report associated with the reference PDSCH transmission; and
generate a CSI report that indicates a Rank Indication (RI), at least one Precoding Matrix Indicator (PMI), and a requested RV sequence for the TB, the requested RV sequence including multiple RVs to be transmitted at different times within the requested RV sequence.
15. The apparatus of claim 14 , wherein the CSI report further indicates at least one Channel Quality Indicator (COI).
16. The apparatus of claim 14 , wherein the DCI is a downlink DCI that indicates both the reference PDSCH transmission and a set of CSI measurement resources.
17. The apparatus of claim 14 , wherein the DCI is an uplink DCI, and wherein the reference PDSCH transmission is a most recent PDSCH transmission prior to a transmission of the CSI report.
18. The apparatus of claim 14 , wherein the DCI is an uplink DCI, and wherein the reference PDSCH transmission is a most recent PDSCH transmission prior to the DCI.
19. The apparatus of claim 14 , wherein the DCI comprises one or more of a priority indication or a traffic type indication that indicates the reference PDSCH transmission.
20. The apparatus of claim 14 , wherein the requested RV sequence is indicated based at least on an explicit indication of each RV of the requested RV sequence.