US 12,593,323 B2Granted

Hybrid automatic repeat request (HARQ)-acknowledgment (ACK) enhancement for semi-persistent scheduled (SPS) physical downlink shared channel (PDSCH) in an unlicensed new radio spectrum (NR-U)

AssigneeQUALCOMM Incorporated

InventorsShaozhen Guo, Jing Sun, Changlong Xu, Xiaoxia Zhang, Rajat Prakash, Hao Xu

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Abstract

A method of wireless communication, by a user equipment (UE) includes receiving downlink semi-persistent scheduling (SPS) configurations. The method also includes receiving a physical downlink shared channel (PDSCH) transmission for each of the plurality of SPS configurations. Each PDSCH transmission has no associated physical downlink control channel (PDCCH). The method further includes determining whether successful decoding of each of the PDSCH transmissions occurred. The method further includes generating a hybrid automatic repeat request (HARQ) codebook for the PDSCH transmissions based on the determining. The method also includes transmitting the HARQ codebook in a physical uplink control channel (PUCCH) only when at least one ACK is present in the HARQ codebook.

Claims18

Dependent claims

A method of wireless communication, by a user equipment (UE), comprising:

receiving a plurality of downlink semi-persistent scheduling (SPS) configurations;
receiving a physical downlink shared channel (PDSCH) transmission for each of the plurality of SPS configurations, each PDSCH transmission having no associated physical downlink control channel (PDCCH);
determining whether successful decoding of each of the PDSCH transmissions occurred;
generating a hybrid automatic repeat request (HARQ) codebook for the PDSCH transmissions based on the determining;
and
transmitting the HARQ codebook in a physical uplink control channel (PUCCH), wherein transmitting the HARQ codebook in the PUCCH comprises transmitting only when at least one acknowledgment (ACK) is present in the HARQ codebook or only when at least one negative acknowledgment (NACK) is present in the HARQ codebook, wherein transmitting the HARQ codebook in the PUCCH comprises:
starting an ACK/NACK retransmission timer in response to transmitting the HARQ codebook in the PUCCH;
stopping the retransmission timer in response to receiving a dynamic grant for SPS PDSCH retransmission for at least one negatively acknowledged HARQ process;
and
retransmitting the HARQ codebook in an additional PUCCH transmission occasion in response to the timer expiring.

7 more elements

A user equipment (UE), comprising:

a processor;
a memory coupled with the processor;
and
instructions stored in the memory and operable, when executed by the processor, to cause the UE:
to receive a plurality of downlink semi-persistent scheduling (SPS) configurations;
to receive a physical downlink shared channel (PDSCH) transmission for each of the plurality of SPS configurations, each PDSCH transmission having no associated physical downlink control channel (PDCCH);
to determine whether successful decoding of each of the PDSCH transmissions occurred;
to generate a hybrid automatic repeat request (HARQ) codebook for the PDSCH transmissions based on the determining;
to transmit the HARQ codebook in a physical uplink control channel (PUCCH) only when at least one acknowledgment (ACK) is present in the HARQ codebook;
or
to transmit the HARQ codebook in a physical uplink control channel (PUCCH) only when at least one negative acknowledgment (NACK) is present in the HARQ codebook,
wherein the instructions to transmit the HARQ codebook in a physical uplink control channel (PUCCH) only when at least one NACK is present in the HARQ codebook further cause the UE:
to start an ACK/NACK retransmission timer in response to transmitting the HARQ codebook in the PUCCH;
to stop the retransmission timer in response to receiving a dynamic grant for SPS PDSCH retransmission for at least one negatively acknowledged HARQ process;
and
to retransmit the HARQ codebook in an additional PUCCH transmission occasion in response to the timer expiring.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/014,719Filed 21 Aug 2020
Published: US 2023/0300816 A121 Sep 2023
Granted: 31 Mar 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

H04L 1/1822
Automatic repetition systems, e.g. Van Duuren systems: involving configuration of automatic repeat request [ARQ] with parallel processes
H04W 72/11
Wireless resource allocation: semi-persistent scheduling
H04L 1/08
Arrangements for detecting or preventing errors in the information received: by repeating transmission, e.g. Verdan system
H04L 1/1812
Automatic repetition systems, e.g. Van Duuren systems: hybrid protocols; Hybrid automatic repeat request [HARQ]