Data transmission method in wireless communication system and device therefor
Disclosed is an uplink (UL) multi-user (MU) transmission method by a station (STA) in a wireless LAN (WLAN) system. The uplink multi-user transmission method by an STA in a WLAN system according to the present invention includes the steps of: receiving a trigger frame including resource unit allocation information for orthogonal frequency division multiple access (OFDMA) transmission; transmitting a UL MU physical protocol data unit (PPDU) frame, on the basis of frequency resource allocation information; and receiving an ACK frame for the UL MU PPDU.
1. A method for receiving an uplink (UL) multi-user (MU) Physical Protocol Data Unit (PPDU) of an access point (AP) in a WLAN system, the method comprising:
transmitting, to a plurality of station (STA)s, a trigger frame including resource unit allocation information for orthogonal frequency division multiple access (OFDMA) transmission and STA identifier (ID)s of the plurality of STAs;
receiving a UL MU Physical Protocol Data Unit (PPDU) based on the trigger frame,
wherein the UL MU PPDU includes a first legacy preamble and a first High Efficiency (HE) preamble, and the first HE preamble comprises a first HE-SIG-A field and a first HE-SIG-B field, and
wherein the first HE-SIG-A field comprises first Transmission Opportunity (TXOP) duration information related to a first TXOP duration, and the first TXOP duration is set to include a time required to transmit the UL MU PPDU and the ACK frame; and
transmitting an ACK frame of the UL MU PPDU.
2. The method of claim 1 ,
wherein the UL MU PPDU comprises a second legacy preamble and a second HE preamble, and the second HE preamble comprises a second HE-SIG-A field, and
wherein the second HE-SIG-A field comprises second TXOP duration information related to a second TXOP duration, and the second TXOP duration is set to include a time required to transmit the UL MU PPDU and the ACK frame.
3. The method of claim 1 ,
wherein the first TXOP duration further comprises an Inter Frame Space (IFS) time between the trigger frame and the UL MU frame and an IFS time between the UL MU frame and the ACK frame.
4. The method of claim 2 ,
wherein the second TXOP duration further comprises an IFS time between the UL MU PPDU and the ACK frame.
5. The method of claim 2 ,
wherein the second HE preamble of the UL MU PPDU further comprises a High Efficiency-Short Training Field (HE-STF), and a HE-Long Training Field (HE-LTF), and
wherein the HE-STF, the HE-LTF, and a data field of the UL MU PPDU are transmitted through a bandwidth of an allocated resource unit.
6. A access point (AP) for receiving an uplink (UL) multi-user (MU) Physical Protocol Data Unit (PPDU) in a WLAN system, the AP comprising:
a Radio Frequency (RF) unit that transmits and receives a wireless signal; and
a processor that controls the RF unit, wherein the processor is configured to,
transmit, to a plurality of station (STA)s, a trigger frame including resource unit allocation information for orthogonal frequency division multiple access (OFDMA) transmission and STA identifier (ID)s of the plurality of STAs,
wherein the trigger frame includes a first legacy preamble and a first High Efficiency (HE) preamble, and the first HE preamble comprises a first HE-SIG-A field and a first HE-SIG-B field, and
wherein the first HE-SIG-A field comprises first Transmission Opportunity (TXOP) duration information related to a first TXOP duration, and the first TXOP duration is set to include a time required to transmit the UL MU PPDU and the ACK frame,
receive a UL MU Physical Protocol Data Unit (PPDU) based on the trigger frame, and
transmit an ACK frame of the UL MU PPDU.
7. The AP of claim 6 ,
wherein the UL MU PPDU comprises a second legacy preamble and a second HE preamble, and the second HE preamble comprises a second HE-SIG-A field, and
wherein the second HE-SIG-A field comprises second TXOP duration information related to a second TXOP duration, and the second TXOP duration is set to include a time required to transmit the UL MU PPDU and the ACK frame.
8. The AP of claim 6 ,
wherein the first TXOP duration further comprises an Inter Frame Space (IFS) time between the trigger frame and the UL MU frame and an IFS time between the UL MU frame and the ACK frame.
9. The AP of claim 7 ,
wherein the second TXOP duration further comprises an IFS time between the UL MU PPDU and the ACK frame.
10. The AP of claim 7 ,
wherein the second HE preamble of the UL MU PPDU further comprises a High Efficiency-Short Training Field (HE-STF), and a HE-Long Training Field (HE-LTF), and
wherein the HE-STF, the HE-LTF, and a data field of the UL MU PPDU are transmitted through a bandwidth of an allocated resource unit.