CPC H04W 76/15 (2018.02) [H04W 84/12 (2013.01)] | 8 Claims |
1. A method in a wireless local area network (LAN) system, the method comprising:
transmitting, by a station (STA), an ADD Block ACK (ADDBA) request signal to a second access point (AP);
in response to the ADDBA request signal, receiving, by the STA, an ADDBA response signal from the second AP, wherein the ADDBA response signal includes control information related to whether the second AP is able to obtain a transmission/reception signal of a first AP;
transmitting, by the STA, a physical protocol data unit (PPDU) to the first AP,
wherein the PPDU includes a legacy signal (L-SIG) field, a repeated legacy signal (RL-SIG) field being contiguous to the L-SIG field, a control signal field being contiguous to the RL-SIG field,
wherein the L-SIG field is transmitted based on 48 coded bits carrying 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,
wherein the L-SIG field carries four extra tones on subcarrier indices of {−28, −27, +27, +28}, and values of the four extra tones are set as {−1, −1, −1, +1},
wherein the RL-SIG field is a repeat of the L-SIG field, and
wherein the control signal field includes first information related to a Basic Service Set (BSS) color, second information related to uplink and downlink direction, and third information related to a transmission opportunity (TXOP); and
determining, by the STA, whether to transmit a Block Acknowledgement Request (BAR) signal for the UL signal to the second AP based on the control information.
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