US 11,991,690 B2
Method and apparatus for flexible transmission on unlicensed spectrum
Haipeng Lei, Beijing (CN); and Alexander Golitschek Edler von Elbwart, Darmstadt (DE)
Assigned to Lenovo (Beijing) Limited, Beijing (CN)
Appl. No. 17/273,896
Filed by LENOVO (BEIJING) LIMITED, Beijing (CN)
PCT Filed Sep. 7, 2018, PCT No. PCT/CN2018/104633
§ 371(c)(1), (2) Date Mar. 5, 2021,
PCT Pub. No. WO2020/047851, PCT Pub. Date Mar. 12, 2020.
Prior Publication US 2021/0243781 A1, Aug. 5, 2021
Int. Cl. H04W 72/00 (2023.01); H04L 5/00 (2006.01); H04W 72/0446 (2023.01); H04W 72/1268 (2023.01); H04W 72/23 (2023.01); H04W 72/50 (2023.01); H04W 74/0816 (2024.01)
CPC H04W 72/1268 (2013.01) [H04L 5/0051 (2013.01); H04W 72/0446 (2013.01); H04W 72/23 (2023.01); H04W 72/535 (2023.01); H04W 74/0816 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A user equipment (UE), comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive an uplink grant that schedules a plurality of time slots for uplink transmission by indicating a time domain resource allocation pattern comprising non-consecutive symbols and a first assigned symbol;
determine, relative to the time domain resource allocation pattern and the first assigned symbol, a plurality of candidate starting positions in a scheduled time slot for the uplink transmission, wherein each candidate starting position among the plurality of candidate starting positions is determined using a predetermined mapping between the respective candidate starting position and a location of a demodulation reference signal (DMRS) symbol, each candidate starting position corresponds to a set of consecutive symbols, and two sets of consecutive symbols are separated by a DMRS symbol;
determine a starting position for the uplink transmission from the plurality of candidate starting positions based on a result of performing a listen before talk (LBT) procedure on the scheduled time slot; and
start the uplink transmission in the scheduled time slot from the determined starting position.