US 12,471,143 B2
CTS transmission method
Jeongki Kim, Seoul (KR); and Jinsoo Choi, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/999,314
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Apr. 29, 2021, PCT No. PCT/KR2021/005476
§ 371(c)(1), (2) Date Nov. 18, 2022,
PCT Pub. No. WO2021/235730, PCT Pub. Date Nov. 25, 2021.
Claims priority of application No. 10-2020-0061056 (KR), filed on May 21, 2020.
Prior Publication US 2023/0189340 A1, Jun. 15, 2023
Int. Cl. H04W 74/0816 (2024.01); H04W 72/0446 (2023.01); H04W 84/12 (2009.01)
CPC H04W 74/0816 (2013.01) [H04W 72/0446 (2013.01); H04W 84/12 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method in a wireless local area network (WLAN) system, the method comprising:
receiving, by a station (STA), an Extremely High Throughput (EHT) physical protocol data unit (PPDU) comprising a Multi-User request to send (RTS) (MU-RTS) trigger frame including a common info field and a user info field,
wherein the EHT PPDU includes a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field being contiguous to the L-SIG field, and a Universal signal (U-SIG) field being contiguous to the RL-SIG field,
wherein the L-SIG field includes a length field which is set to a value satisfying a condition that a remainder is zero when the length field is divided by three (3), and the remainder is used to differentiate the EHT PPDU from a High Efficiency (HE) PPDU,
wherein four extra subcarriers are inserted at indexes of {−28,−27, 27, 28} in the L-SIG field, and values of the four extra subcarriers are {−1,−1,−1, 1}, respectively,
wherein the U-SIG field has a length of 2 symbols,
wherein each symbol of the U-SIG field carries 26-bit information, and the U-SIG field comprises version-independent fields followed by version-dependent fields,
wherein the version-independent fields include first information having a length of 3 bits and related to a physical version, second information related to transmission opportunity (TXOP), third information related to an identifier of a Basic Service Set (BSS), and fourth information having a length of 1 bit and related to whether the EHT PPDU is sent in an uplink (UL) or a downlink (DL),
wherein the version-dependent fields include fifth information related to a PPDU type which is related to a single-user (SU) transmission or a MU transmission;
obtaining, by the STA, information related to any punctured 20 MHZ subchannel; and
in response to the MU-RTS trigger frame, transmitting, by the STA, a clear-to-send (CTS) frame in a resource excluding the any punctured 20 MHz subchannel.