US 11,711,176 B2
Systems and methods for NR V2X CSI feedback without dedicated reference signals
Alexey Khoryaev, Nizhny Novgorod (RU); Sergey Panteleev, Nizhny Novgorod (RU); Mikhail Shilov, Nizhny Novgorod (RU); Leonardo Gomes Baltar, Munich (DE); and Kilian Roth, Munich (DE)
Assigned to APPLE INC., Cupertino, CA (US)
Appl. No. 17/277,108
Filed by APPLE INC., Cupertino, CA (US)
PCT Filed Sep. 26, 2019, PCT No. PCT/US2019/053216
§ 371(c)(1), (2) Date Mar. 17, 2021,
PCT Pub. No. WO2020/069170, PCT Pub. Date Apr. 2, 2020.
Claims priority of provisional application 62/739,047, filed on Sep. 28, 2018.
Prior Publication US 2021/0367717 A1, Nov. 25, 2021
Int. Cl. H04W 4/40 (2018.01); H04L 1/1867 (2023.01); H04L 1/00 (2006.01); H04L 1/1812 (2023.01); H04L 5/00 (2006.01); H04W 24/10 (2009.01)
CPC H04L 1/1896 (2013.01) [H04L 1/0003 (2013.01); H04L 1/0026 (2013.01); H04L 1/1819 (2013.01); H04L 5/0051 (2013.01); H04W 4/40 (2018.02); H04W 24/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus for a user equipment (UE) configured for multi-antenna communication, the apparatus comprising:
a memory interface to send or receive, to or from a memory device, communication data associated with a plurality of packets communicated using device to device (D2D) communication, wherein the communication data comprises demodulation information associated with demodulation of the plurality of packets received at the UE using the D2D communication over a period of time, and wherein the demodulation information comprises a demodulation reference signal (DMRS); and
a processor to:
estimate, based on the communication data and without using a dedicated reference signal for the D2D communication, at least one of a rank indicator and a channel quality indicator for the D2D communication;
encode a feedback message to one or more transmitters participating in the D2D communication, the feedback message indicating at least one of the rank indicator and the channel quality indicator;
determine an estimated channel based on the DMRS to demodulate the plurality of packets;
determine, based on the DMRS, an interference measurement per sub-channel; and
determine the channel quality indicator by averaging or weighting both the estimated channel and the interference measurement over at least one of the period of time and a bandwidth used for transmission.