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CN-116325591-B - Acknowledgement (ACK) and Negative Acknowledgement (NACK) reporting for Physical Downlink Shared Channel (PDSCH) grants

CN116325591BCN 116325591 BCN116325591 BCN 116325591BCN-116325591-B

Abstract

Systems, methods, and apparatuses are provided for using acknowledgement (ACK-NACK) bundling in reporting bundled ACK-NACKs for multiple Physical Downlink Shared Channel (PDSCH) associated with PDSCH grants from a User Equipment (UE). A counter Downlink Assignment Indicator (DAI) and a total DAI may be used to track PDSCH grants received at the UE. The UE may detect the missing PDSCH and report an ACK-NACK for the missing PDSCH based on the counter DAI and the total DAI. A Base Station (BS) may transmit PDSCH grants associated with the plurality of PDSCH to the UE. The BS may receive bundled ACK-NACKs for multiple PDSCH associated with a PDSCH grant from the UE.

Inventors

  • J.SUN
  • ZHANG XIAOXIA
  • LUO TAO
  • J. Montoho

Assignees

  • 高通股份有限公司

Dates

Publication Date
20260505
Application Date
20211004
Priority Date
20211001

Claims (20)

  1. 1. A method of wireless communication performed by an apparatus of a User Equipment (UE), comprising: Receiving, from a network node, downlink Control Information (DCI) including Physical Downlink Shared Channels (PDSCH) grants configured to schedule a plurality of PDSCH, wherein the PDSCH grants are associated with a total Downlink Assignment Indicator (DAI) when carrier aggregation is enabled, wherein the DCI indicates: PDSCH-to-hybrid automatic repeat request (HARQ) feedback timing value, and And transmitting HARQ acknowledgement/negative acknowledgement (ACK/NACK) feedback to the network node and using a fixed feedback size in the PUCCH resources, the HARQ ACK/NACK feedback bundled for the plurality of PDSCHs according to: spatial bundling configuration with respect to bundling the plurality of PDSCH, and A Code Block Group (CBG) ACK-NACK configuration for the UE.
  2. 2. The method of claim 1, wherein the PDSCH-to-HARQ feedback timing value corresponds to a time period between a last PDSCH of the plurality of PDSCH and the PUCCH resource.
  3. 3. The method of claim 1, wherein the HARQ ACK/NACK feedback for the plurality of PDSCH comprises an Acknowledgement (ACK) or a Negative Acknowledgement (NACK) associated with the plurality of PDSCH.
  4. 4. A method of wireless communication performed by an apparatus of a User Equipment (UE), comprising: Receiving Downlink Control Information (DCI) from a network node, the DCI including a first Physical Downlink Shared Channel (PDSCH) grant for a plurality of PDSCH, wherein: the first PDSCH grant is associated with a first counter Downlink Assignment Indicator (DAI), When carrier aggregation is enabled, the first PDSCH grant is associated with a total DAI, A second PDSCH grant included in the second DCI and occurring later in time than the first PDSCH grant is associated with a second counter Downlink Assignment Indicator (DAI), an The first PDSCH grant and the second PDSCH grant are associated with a same Physical Uplink Control Channel (PUCCH) reporting instance, and Bundled acknowledgement/negative acknowledgement (ACK-NACK) for the plurality of PDSCH is sent to the network node via the PUCCH reporting instance.
  5. 5. The method of claim 4, wherein the PDSCH grant is a multiple PDSCH grant and the bundled size of the ACK-NACKs for the multiple PDSCH associated with the multiple PDSCH grant corresponds to a size of an ACK-NACK for a single PDSCH grant.
  6. 6. The method of claim 4, wherein the PDSCH grant is associated with a counter Downlink Assignment Indicator (DAI) when a single component carrier is configured.
  7. 7. The method of claim 4, further comprising: Determining that the first PDSCH grant or the second PDSCH grant corresponds to a lost PDSCH grant based on the first counter DAI or the second counter DAI, and Wherein transmitting the ACK-NACK includes transmitting a Negative Acknowledgement (NACK) for the lost PDSCH grant.
  8. 8. The method of claim 4, wherein transmitting the ACK-NACK comprises: For a single codeword without spatial bundling or for multiple codewords with spatial bundling, and when a Code Block Group (CBG) ACK-NACK is not configured for the UE, transmitting the ACK-NACK for the plurality of PDSCH per DCI.
  9. 9. The method of claim 4, wherein the ACK-NACK for the plurality of PDSCH is one ACK-NACK bit.
  10. 10. The method of claim 4, wherein transmitting the ACK-NACK comprises: For a multi-codeword and when a Code Block Group (CBG) ACK-NACK is not configured for the UE, transmitting the ACK-NACK for the plurality of PDSCH.
  11. 11. The method of claim 10, wherein the ACK-NACK for each PDSCH included in the plurality of PDSCH is two ACK-NACK bits.
  12. 12. The method of claim 10, wherein the ACK-NACK is bundled across PDSCH of the plurality of PDSCH.
  13. 13. The method of claim 10, wherein the ACK-NACKs are spatially bundled and associated with a subset of PDSCH of the plurality of PDSCH.
  14. 14. An apparatus of a User Equipment (UE) for wireless communication, comprising: a first interface configured to obtain Downlink Control Information (DCI) including a Physical Downlink Shared Channel (PDSCH) grant configured to schedule a plurality of PDSCH, wherein the PDSCH grant is associated with a total Downlink Assignment Indicator (DAI) when carrier aggregation is enabled, wherein the DCI indicates: PDSCH-to-hybrid automatic repeat request (HARQ) feedback timing value, and And the first interface or the second interface is configured to output HARQ acknowledgement/negative acknowledgement (ACK/NACK) feedback using a fixed feedback size in the PUCCH resources, the HARQ ACK/NACK feedback being bundled for the plurality of PDSCHs according to: spatial bundling configuration with respect to bundling the plurality of PDSCH, and A Code Block Group (CBG) ACK-NACK configuration for the UE.
  15. 15. The apparatus of claim 14, wherein the PDSCH-to-HARQ feedback timing value corresponds to a time period between a last PDSCH of the plurality of PDSCH and the PUCCH resource.
  16. 16. The apparatus of claim 14, wherein the HARQ ACK/NACK feedback for the plurality of PDSCH comprises an Acknowledgement (ACK) or a Negative Acknowledgement (NACK) associated with the plurality of PDSCH.
  17. 17. An apparatus of a User Equipment (UE) for wireless communication, comprising: a first interface configured to obtain Downlink Control Information (DCI) including a first Physical Downlink Shared Channel (PDSCH) grant for a plurality of PDSCH, wherein: the first PDSCH grant is associated with a first counter Downlink Assignment Indicator (DAI), When carrier aggregation is enabled, the first PDSCH grant is associated with a total DAI, A second PDSCH grant included in the second DCI and occurring later in time than the first PDSCH grant is associated with a second counter Downlink Assignment Indicator (DAI), an The first PDSCH grant and the second PDSCH grant are associated with a same Physical Uplink Control Channel (PUCCH) reporting instance, and The first interface or second interface is configured to output bundled acknowledgement/negative acknowledgement (ACK-NACK) for the plurality of PDSCH via the PUCCH reporting instance.
  18. 18. The apparatus of claim 17, wherein the PDSCH grant is a multiple PDSCH grant and the bundled size of the ACK-NACKs for the multiple PDSCH associated with the multiple PDSCH grant corresponds to a size of an ACK-NACK for a single PDSCH grant.
  19. 19. The apparatus of claim 17, wherein the PDSCH grant is associated with a counter Downlink Assignment Indicator (DAI) when a single component carrier is configured.
  20. 20. The apparatus of claim 17, further comprising: a processing system configured to determine, based on the first counter DAI or the second counter DAI, that the first PDSCH grant or the second PDSCH grant corresponds to a lost PDSCH grant, and Wherein the first interface or the second interface is further configured to output a Negative Acknowledgement (NACK) for the lost PDSCH grant.

Description

Acknowledgement (ACK) and Negative Acknowledgement (NACK) reporting for Physical Downlink Shared Channel (PDSCH) grants Cross Reference to Related Applications This patent application claims priority from U.S. provisional patent application No.63/198,341, filed on 10/12/2020, and U.S. non-provisional patent application No.17/449,761, filed on 1/2021, "ACKNOWLEDGEMENT(ACK)AND NEGATIVE ACKNOWLEDGEMENT(NACK)REPORTING FOR A PHYSICAL DOWNLINK SHARED CHANNEL(PDSCH)GRANT", which are hereby expressly incorporated by reference. Technical Field Aspects of the present disclosure relate generally to wireless communications and to techniques for acknowledgement and negative acknowledgement (ACK/NACK) reporting for Physical Downlink Shared Channel (PDSCH) grants. Background Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple-access techniques capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, time Division Multiple Access (TDMA) systems, frequency Division Multiple Access (FDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-advanced is an enhanced set of Universal Mobile Telecommunications System (UMTS) mobile standards promulgated by the third generation partnership project (3 GPP). A wireless network may include one or more base stations that support communication for one User Equipment (UE) or multiple UEs. The UE may communicate with the base station via downlink and uplink communications. "downlink" (or "DL") refers to the communication link from a base station to a UE, and "uplink" (or "UL") refers to the communication link from a UE to a base station. These multiple access techniques have been employed in various telecommunications standards to provide a common protocol that enables different UEs to communicate at a municipal, national, regional, or global level. The New Radio (NR), which may also be referred to as 5G, is an enhanced set of LTE mobile standards promulgated by 3 GPP. NR is designed to better integrate with other open standards by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on the downlink (CP-OFDM), CP-OFDM or single carrier frequency division multiplexing (SC-FDM) on the uplink (also known as discrete fourier transform spread OFDM (DFT-s-OFDM)), and support beamforming, multiple Input Multiple Output (MIMO) antenna technology, and carrier aggregation, thereby better supporting mobile broadband internet access. Disclosure of Invention The systems, methods, and apparatus of the present disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein. One innovative aspect of the subject matter described in this disclosure can be implemented in a method of wireless communication performed by an apparatus of a User Equipment (UE). The method may include receiving Downlink Control Information (DCI) from a base station configured to schedule a plurality of Physical Downlink Shared Channels (PDSCHs), wherein the DCI indicates a PDSCH-to-hybrid automatic repeat request (HARQ) feedback timing value and a Physical Uplink Control Channel (PUCCH) resource indicator (PRI) associated with PUCCH resources, and transmitting HARQ feedback for the plurality of PDSCHs to the base station using the PUCCH resources. One innovative aspect of the subject matter described in this disclosure can be implemented in a method of wireless communication performed by an apparatus of a UE. The method may include receiving DCI from a base station, the DCI including PDSCH grants for a plurality of PDSCH, and transmitting bundled acknowledgements and negative acknowledgements (ACK-NACKs) for the plurality of PDSCH to the base station via a PUCCH. One innovative aspect of the subject matter described in this disclosure can be implemented in a method of wireless communication performed by an apparatus of a UE. The method may include receiving DCI from a base station, the DCI including PDSCH grants for a plurality of PDSCH, identifying virtual DCI associated with at least one PDSCH included in the plurality of PDSCH, and transmitting ACK-NACK for the plurality of PDSCH to the base station via PUCCH based on the virtual DCI. Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for a UE for wireless communication. The apparatus may i