Method for transmitting and receiving acknowledgement/negative acknowledgement signal for uplink multi-user data in wireless lan system, and apparatus therefor

A method of receiving an Acknowledgement/Negative Acknowledgement (Ack/Nack) signal of transmission data from an Access Point (AP) by a Station (STA) in a wireless local area network (WLAN) system, the method comprising:

• receiving a trigger frame from the AP;
• transmitting data through a multi-STA frame to the AP in response to the trigger frame;
• and
• receiving an Ack/Nack signal of the transmitted data through a Multi-STA Block Ack (M-BA) frame,
• wherein, if the M-BA frame does not include an Ack/Nack signal for the STA, the STA receives the Ack/Nack signal with reference to information about an additional Ack/Nack signal transmission scheme of the M-BA frame.

An Access Point (AP) for transmitting an Acknowledgement/Negative Acknowledgement (Ack/Nack) signal of transmission data of a plurality of stations (STAs) in a Wireless Local Area Network (WLAN) system, the AP comprising:

• a transceiver configured to transmit a trigger frame to the plural STAs, receive data from the plural STAs in response to the trigger frame, and transmit Ack/Nack signals of data received from the plural STAs through a Multi-STA Block Ack (M-BA) frame;
• and
• a processor connected to the transceiver and configured to process the trigger frame, the received data, and the M-BA frame,
• wherein the processor causes the M-BA frame to include Ack/Nack signals for STAs, the number of which is determined not to exceed a specific transmission unit time, among the Ack/Nack signals for the plural STAs and additionally transmits Ack/Nack signals to one or more STAs to which the Ack/Nack signals have not been transmitted through the M-BA frame among the plural STAs.

A Station (STA) for receiving an Acknowledgement/Negative Acknowledgement (Ack/Nack) signal of transmission data from an Access Point (AP) in a wireless local area network (WLAN) system, the STA comprising:

• a transceiver configured to receive a trigger frame transmitted to a plurality of STAs including the STA, transmit data to the AP in response to the trigger frame, and receive an Ack/Nack signal of the data through a Multi-STA Block Ack (M-BA) frame from the AP;
• and
• a processor connected to the transceiver and configured to process the trigger frame, the transmitted data, and the M-BA frame,
• wherein, if the M-BA frame does not include an Ack/Nack signal for the STA, the processor receives the Ack/Nack signal with reference to information about an additional Ack/Nack signal transmission scheme of the M-BA frame.