US 12,143,225 B2
Enhanced HARQ feedback for reliable communications
Honglei Miao, Munich (DE)
Assigned to APPLE INC., Cupertino, CA (US)
Appl. No. 17/265,473
Filed by APPLE INC., Cupertino, CA (US)
PCT Filed Aug. 8, 2019, PCT No. PCT/US2019/045647
§ 371(c)(1), (2) Date Feb. 2, 2021,
PCT Pub. No. WO2020/033640, PCT Pub. Date Feb. 13, 2020.
Claims priority of provisional application 62/717,542, filed on Aug. 10, 2018.
Prior Publication US 2021/0297192 A1, Sep. 23, 2021
Int. Cl. H04L 1/1825 (2023.01); H04L 1/1812 (2023.01); H04W 72/12 (2023.01); H04W 72/21 (2023.01); H04W 72/23 (2023.01)
CPC H04L 1/1825 (2013.01) [H04L 1/1812 (2013.01); H04W 72/12 (2013.01); H04W 72/21 (2023.01); H04W 72/23 (2023.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus for a user equipment (UE), the apparatus comprising:
a memory interface to send or receive, to or from a memory device, data correspond to hybrid automatic repeat request (HARQ) feedback; and
a processor to:
process repetitions of a physical downlink shared channel (PDSCH) transmission;
determine a fewest number of the repetitions used by the UE to decode the PDSCH transmission;
determine that four or more of the repetitions have been scheduled for the PDSCH transmission; and
generate the HARQ feedback in response to the PDSCH transmission, the HARQ feedback indicating the fewest number of the repetitions used by the UE to decode the PDSCH transmission, wherein in response to the determination that the four or more of the repetitions have been scheduled for the PDSCH transmission, the processor is further configured to generate the HARQ feedback using a HARQ-value mapping comprising:
HARQ value 0 to indicate a negative acknowledgement (NACK);
HARQ value 1 to indicate an acknowledgement (ACK) with up to a quarter of the repetitions used by the UE to decode the PDSCH transmission;
HARQ value 2 to indicate an ACK with up to half of the repetitions used by the UE to decode the PDSCH transmission; and
HARQ value 3 to indicate an ACK with more than half of the repetitions used by the UE to decode the PDSCH transmission.