US 12,426,024 B2
Channel switching for C-OFDMA transmission in multi-AP system
Sungjin Park, Seoul (KR); Jeongki Kim, Seoul (KR); Jinsoo Choi, Seoul (KR); Suhwook Kim, Seoul (KR); Namyeong Kim, Seoul (KR); Taewon Song, Seoul (KR); and Insun Jang, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 17/791,863
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Sep. 25, 2020, PCT No. PCT/KR2020/013037
§ 371(c)(1), (2) Date Aug. 29, 2022,
PCT Pub. No. WO2021/141211, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 10-2020-0002496 (KR), filed on Jan. 8, 2020.
Prior Publication US 2023/0103807 A1, Apr. 6, 2023
Int. Cl. H04W 72/0453 (2023.01); H04W 84/12 (2009.01)
CPC H04W 72/0453 (2013.01) [H04W 84/12 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method, comprising:
transmitting, by a shared access point (AP), a management frame including allocation information for a first channel to a first station (STA) and a second STA, wherein the shared AP is associated with the first STA and the second STA;
receiving, by the shared AP from a sharing AP, an allocation of a second channel for coordinated orthogonal frequency division multiplexing access (C-OFDMA) transmission;
transmitting, by the shared AP, a channel switching signal requesting a channel switching from the first channel to the second channel,
wherein the channel switching signal is transmitted only to the first STA participating in the C-OFDMA and is not transmitted to the second STA not participating in the C-OFDMA; and
transmitting, by the shared AP, a physical protocol data unit (PPDU) based on the second channel,
wherein the PPDU includes a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field being contiguous to the L-SIG field, and a first signal field being contiguous to the RL-SIG field,
wherein the L-SIG field includes a length field, and a value of the length field is set to satisfy a condition that a remainder is zero (0) when the value of the length field is divided by three (3), and
wherein the first SIG field includes first information related to a PPDU type, second information related to an identifier of a basic service set (BSS), third information indicating duration information related to a transmission opportunity (TXOP), fourth information related to whether the PPDU is sent in uplink (UL) or in downlink (DL), fifth information related to a bandwidth, and sixth information having a length of 3 bits and indicating a physical (PHY) version of the PPDU,
wherein the method further comprises,
receiving, by the shared AP from the sharing AP, a request frame requesting participation in multi-AP transmission; and
transmitting, by the shared AP to the sharing AP, a multi-AP transmission response frame,
wherein the request frame is transmitted in a broadcasting manner, and includes media access control (MAC) addresses of APs requested to participate in multi-AP transmission, and
wherein the multi-AP transmission response frame includes at least one of buffer status information of the shared AP, an available channel of the shared AP, or a clear channel assessment (CCA) results of the available channel.