Method and device for transmitting data in wireless LAN system

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

• a memory;
• a transceiver;
• and
• a processor operatively coupled to the memory and the transceiver, wherein the processor is configured to:
• receive setup information on a multi-band;
• transmit a multi-band setup request frame to a receiving device;
• receive a multi-band setup response frame from the receiving device;
• transmit a multi-band Ack request frame to the receiving device;
• receive a multi-band Ack response frame from the receiving device;
• perform channel sensing on the multi-band;
• and
• transmit the data to the receiving device through the multi-band, based on a result of the channel sensing,
• wherein a first band and a second band are aggregated in the multi-band,
• wherein the first band includes a first primary channel,
• wherein the second band includes a second primary channel,
• wherein the result of the channel sensing is acquired based on whether the first primary channel is idle until a first backoff count (BC) value is 0 and whether the second primary channel is idle until a second BC value is 0,
• wherein the first BC value is selected in a first contention window (CW) configured for the first primary channel, and
• wherein the second BC value is selected in a second CW configured for the second primary channel,
• wherein the transmitting device includes a first station management entity (SME), a first MAC layer management entity (MLME), and a second MLME,
• wherein the receiving device includes a second SME, a third MLME, and a fourth MLME,
• wherein the first MLME and the third MLME are entities supporting the first band,
• wherein the second MLME and the fourth MLME are entities supporting the second band,
• wherein the multi-band setup request frame and the multi-band setup response frame are transmitted/received between the first MLME and the third MLME,
• wherein the multi-band Ack request frame and the multi-band Ack response frame are transmitted/received between the second MLME and the fourth MLME,
• wherein the first and second SMEs generate a primitive including a multi-band parameter,
• wherein the multi-band parameter includes a channel number, operating class, and band identifier (ID) designated in the multi-band, and
• wherein the primitive is transferred to the first to fourth MLMEs.

A method of receiving data in a wireless local area network (WLAN) system, the method comprising:

• transmitting, by a receiving device, setup information on a multi-band;
• and
• transmitting, by the transmitting device, a multi-band setup request frame to the receiving device:
• receiving, by the transmitting device, a multi-band setup response frame from the receiving device;
• transmitting, by the transmitting device, a multi-band Ack request frame to the receiving device;
• receiving, by the transmitting device, a multi-band Ack response frame from the receiving device;
• performing, by the transmitting device, channel sensing on the multi-band;
• and receiving, by the receiving device, data from a transmitting device through the multi-band,
• wherein the data is transmitted based on a result of channel sensing on the multi-band,
• wherein a first band and a second band are aggregated in the multi-band,
• wherein the first band includes a first primary channel,
• wherein the second band includes a second primary channel,
• wherein the result of the channel sensing is acquired based on whether the first primary channel is idle until a first backoff count (BC) value is 0 and whether the second primary channel is idle until a second BC value is 0,
• wherein the first BC value is selected in a first contention window (CW) configured for the first primary channel, and
• wherein the second BC value is selected in a second CW configured for the second primary channel,
• wherein the transmitting device includes a first station management entity (SME), a first MAC layer management entity (MLME), and a second MLME,
• wherein the receiving device includes a second SME, a third MLME, and a fourth MLME,
• wherein the first MLME and the third MLME are entities supporting the first band,
• wherein the second MLME and the fourth MLME are entities supporting the second band,
• wherein the multi-band setup request frame and the multi-band setup response frame are transmitted/received between the first MLME and the third MLME,
• wherein the multi-band Ack request frame and the multi-band Ack response frame are transmitted/received between the second MLME and the fourth MLME,
• wherein the first and second SMEs generate a primitive including a multi-band parameter,
• wherein the multi-band parameter includes a channel number, operating class, and band identifier (ID) designated in the multi-band, and
• wherein the primitive is transferred to the first to fourth MLMEs.