Uplink signal transmission method and station device, and uplink signal receiving method and access point device

A station (STA) for transmitting an uplink signal to an access point (AP) in a wireless local area network (WLAN), the STA comprising:

• a radio frequency (RF) unit;
• and
• a processor configured to control the RF unit,
• wherein the processor is configured to sense, using the RF unit, a signal transmitted to the AP by another STA on a medium to sense that the medium is being occupied by the another STA;
• the processor is configured to acquire at least one of identifier information of the another STA, identifier information of the AP, and time/frequency synchronization information with the another STA, based on the sensed signal;
• and the processor is configured to control the RF unit to transmit the uplink signal to the AP on the medium currently occupied by the another STA, using the acquired information.

A method for receiving an uplink signal from a station (STA) by an access point (AP) in a wireless local area network (WLAN), the method comprising:

• receiving a signal on a medium from another STA;
• and
• receiving the uplink signal from the STA on the medium on which the signal is being received from the another STA,
• wherein the uplink signal is received using at least one of identifier information of the another STA, identifier information of the AP, and time/frequency synchronization information with the another STA, obtained based on the signal transmitted by the another STA.

An access point (AP) for receiving an uplink signal from a station (STA) in a wireless local area network (WLAN), the access point comprising:

• a radio frequency (RF) unit;
• and
• a processor configured to control the RF unit,
• wherein the processor receives the uplink signal from the STA on a medium on which the RF unit is receiving a signal transmitted by another STA, and
• wherein the uplink signal is received using at least one of identifier information of the another STA, identifier information of the AP, and time/frequency synchronization information with the another STA, obtained based on the signal transmitted by the another STA.