US 12,438,645 B2
Sidelink data packet acknowledgment
Prateek Basu Mallick, Dreieich (DE); Karthikeyan Ganesan, Nauheim (DE); Ravi Kuchibhotla, Chicago, IL (US); Alexander Johann Maria Golitschek Edler von Elbwart, Darmstadt (DE); Xiaodong Yu, Beijing (CN); Hyejung Jung, Northbrook, IL (US); Joachim Loehr, Wiesbaden (DE); and Vijay Nangia, Woodridge, IL (US)
Assigned to Lenovo (Beijing) Limited, Beijing (CN)
Appl. No. 17/280,108
Filed by LENOVO (BEIJING) LIMITED, Beijing (CN)
PCT Filed May 5, 2019, PCT No. PCT/CN2019/085478
§ 371(c)(1), (2) Date Mar. 25, 2021,
PCT Pub. No. WO2020/223846, PCT Pub. Date Nov. 12, 2020.
Prior Publication US 2022/0006571 A1, Jan. 6, 2022
Int. Cl. H04L 1/1812 (2023.01); H04L 5/00 (2006.01); H04W 72/20 (2023.01)
CPC H04L 1/1816 (2013.01) [H04L 5/0055 (2013.01); H04W 72/20 (2023.01)] 18 Claims
OG exemplary drawing
 
1. A method performed by a user equipment (UE), the method comprising:
receiving a data packet from a base station;
receiving a sidelink control information (SCI) corresponding to the received data packet, the SCI comprising at least one of a new data indicator (NDI) and a sequence number of the received data packet;
determining whether the received data packet is a retransmission of a previous successfully decoded data packet based on at least one of:
the NDI of the received data packet being toggled or not toggled; or
the sequence number of the received data packet matching or not matching a corresponding sequence number associated with the previous successfully decoded data packet;
in response to the received data packet being a retransmission of a previous successfully decoded data packet, transmitting, to the base station, feedback that indicates to inhibit retransmission of the received data packet, wherein the NDI being toggled comprises a change in a value of the NDI with respect to a previous value of the NDI; and
emptying a soft buffer of the UE in response to the NDI being toggled.