Uplink multi-user transmission method in wireless LAN system and apparatus therefor

A method for an access point (AP) to receive uplink data from multiple stations (STAs) in a wireless local area network (WLAN) system, the method comprising:

• transmitting, to the multiple STAs, a frame including uplink multi-user (UL MU) scheduling information for a transmission of the uplink data;
• and
• receiving, from the multiple STAs, the uplink data based on the UL MU scheduling information,
• wherein the reception of the uplink data is performed after a SIFS (Short Interframe Space),
• wherein a start timing of the SIFS is end of the frame,
• wherein the frame includes a specific field including null information for extending a length of the frame to delay the start timing of the SIFS, and
• wherein the STA is provided with an additional time to prepare for the transmission of the uplink data based on the delay of the start timing of the SIFS.

A station (STA) for transmitting uplink data in a wireless local area network (WLAN) system, the STA comprising:

• a transceiver configured to receive, from an access point (AP), a frame including uplink multi-user (UL MU) scheduling information for the uplink data transmission, and to transmit the uplink data to the AP based on the UL MU scheduling information;
• and
• a processor configured to control the transceiver such that the transmission of the uplink data to be performed after a SIFS (Short Interframe Space),
• wherein a start timing of the SIFS is end of the frame,
• wherein the frame further includes a specific field including null information for extending a length of the frame to delay the start timing of the SIFS,
• wherein the STA is provided with an additional time to prepare for the transmission of the uplink data based on the delay of the start timing of the SIFS.

An access point (AP) for receiving uplink data from multiple stations (STAs) in a wireless local area network (WLAN) system, the AP comprising:

• a transceiver configured to transmit, to the multiple STAs, a frame including uplink multi-user (UL MU) scheduling information for a transmission of the uplink data, and to receive, from the multiple STAs, the uplink data based on the UL MU scheduling information;
• and
• a processor configured to control the transceiver such that the reception of the uplink data is performed after a SIFS (Short Interframe Space),
• wherein a start timing of the SIFS is end of the frame,
• wherein the frame includes a specific field including null information for extending a length of the frame to delay the start timing of the SIFS, and
• wherein the STA is provided with an additional time to prepare for the transmission of the uplink data based on the delay of the start timing of the SIFS.