Method for transmitting and receiving data over secondary channel in wireless LAN system and apparatus therefor

A method of receiving, by a first station (STA), data from a second STA in a wireless local area network (WLAN) system, the method comprising:

• receiving allocation information on a secondary channel of the WLAN system and information on the secondary channel from an access point (AP);
• performing a channel sensing (CS) mechanism based on an interframe space (IFS) determined based on the information on the secondary channel within an allocation period on the secondary channel, wherein the allocation period is indicated based on the allocation information;
• and
• receiving the data from the second STA during the allocation period from a time when it is determined based on the performed CS mechanism that the secondary channel is an idle state,
• wherein the allocation information on the secondary channel and the information on the secondary channel are received on a primary channel of the WLAN system.

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

• a transceiver configured to exchange signals with one or more other STA devices with at least one radio frequency (RF) chain;
• and
• a processor connected to the transceiver and configured to process the signals exchanged with the one or more other STA devices,
• wherein the processor is configured to:
• receive allocation information on a secondary channel of the WLAN system and information on the secondary channel from an access point (AP);
• perform a channel sensing (CS) mechanism based on an interframe space (IFS) determined based on the information on the secondary channel within an allocation period on the secondary channel, wherein the allocation period is indicated based on the allocation information;
• and
• transmit the data to a second STA during the allocation period from a time when it is determined based on the performed CS mechanism that the secondary channel is an idle state,
• wherein the allocation information on the secondary channel and the information on the secondary channel are received on a primary channel of the WLAN system.

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

• a transceiver configured to exchange signals with one or more other STA devices with at least one radio frequency (RF) chain;
• and
• a processor connected to the transceiver and configured to process the signals exchanged with the one or more other STA devices,
• wherein the processor is configured to:
• receive allocation information on a secondary channel of the WLAN system and information on the secondary channel from an access point (AP);
• perform a channel sensing (CS) mechanism based on an interframe space (IFS) determined based on the information on the secondary channel within an allocation period on the secondary channel, wherein the allocation period is indicated based on the allocation information;
• and
• receive the data from a second STA during the allocation period from a time when it is determined based on the performed CS mechanism that the secondary channel is an idle state,
• wherein the allocation information on the secondary channel and the information on the secondary channel are received on a primary channel of the WLAN system.