US 11,671,203 B2
Method and device for determining HARQ feedback option in NR V2X
Jongyoul Lee, Seoul (KR); Hanbyul Seo, Seoul (KR); Youngdae Lee, Seoul (KR); and Giwon Park, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on Oct. 26, 2021, as Appl. No. 17/511,179.
Application 17/511,179 is a continuation of application No. PCT/KR2020/004687, filed on Apr. 7, 2020.
Claims priority of provisional application 62/910,382, filed on Oct. 3, 2019.
Claims priority of application No. 10-2019-0049561 (KR), filed on Apr. 29, 2019; and application No. 10-2019-0066358 (KR), filed on Jun. 5, 2019.
Prior Publication US 2022/0052792 A1, Feb. 17, 2022
Int. Cl. H04L 1/1812 (2023.01); H04L 5/00 (2006.01); H04W 72/0446 (2023.01); H04W 72/20 (2023.01); H04W 4/08 (2009.01); H04W 52/32 (2009.01); H04W 92/18 (2009.01)
CPC H04L 1/1812 (2013.01) [H04L 5/0053 (2013.01); H04W 4/08 (2013.01); H04W 52/327 (2013.01); H04W 72/0446 (2013.01); H04W 72/20 (2023.01); H04W 92/18 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for performing, by a first device, groupcast communication with one or more devices in a group, the method comprising:
determining a number of physical sidelink feedback channel (PSFCH) resources related to a physical sidelink shared channel (PSSCH) resource;
selecting negative-only hybrid automatic repeat request (HARQ) feedback, from among the negative-only HARQ feedback and positive-negative HARQ feedback, based on a size of the group being greater than the number of PSFCH resources;
transmitting, to the one or more devices, information regarding the negative-only HARQ feedback;
transmitting, to the one or more devices, data based on the PSSCH resource; and
receiving negative acknowledgement (NACK) from at least one second device, based on failure of decoding of the data by the at least one second device among the one or more devices,
wherein, based on transmitting the information regarding the negative-only HARQ feedback through sidelink control information (SCI) related to initial transmission of the data, the first device is not allowed to transmit information regarding the positive-negative HARQ feedback through SCI related to retransmission of the data.