US 12,413,356 B2
Extremely high throughput trigger based (EHTTB) legacy preamble puncturing for fine timing and frequency offset estimation
Mohsen Jamalabdollahi, Akron, OH (US); Ardalan Alizadeh, Milpitas, CA (US); Audrey Yazdanparast, Richfield, OH (US); and Matthew Aaron Silverman, Shaker Heights, OH (US)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Aug. 17, 2022, as Appl. No. 17/820,404.
Prior Publication US 2024/0072955 A1, Feb. 29, 2024
Int. Cl. H04L 27/26 (2006.01); H04L 5/00 (2006.01); H04W 56/00 (2009.01)
CPC H04L 5/0044 (2013.01) [H04L 5/0007 (2013.01); H04L 5/0053 (2013.01); H04W 56/001 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method comprising:
allocating, within a user information field of a trigger frame, a legacy preamble puncturing pattern to each of a plurality of client devices wherein each of the plurality of client devices is allocated with at least one respective corresponding non-overlapping sub-channel;
receiving, from each of the plurality of client devices on their respective corresponding non-overlapping sub-channel, a respective corresponding preamble; and
performing time and frequency synchronization for each of the plurality of client devices based on their respective corresponding preamble wherein the respective corresponding preamble is extracted from a Physical Layer Protocol Data Unit (PPDU) received in response to the trigger frame.