Full-duplex communication method in high efficient wireless LAN network and station apparatus

1. A full-duplex communication method in a high efficiency wireless local area network (WLAN), the full-duplex communication method being performed by an access point (AP) in a WLAN network, the method comprising:

transmitting a reference frame to at least one station (STA);

receiving an uplink frame from the at least one STA in a time period determined on a basis of the transmitted reference frame; and

transmitting a downlink frame to the at least one STA in a specific time duration of the time period,

wherein the uplink frame and the downlink frame aligned at frame boundaries in the time period are transmitted simultaneously through a same channel,

wherein a legacy part of the downlink frame is a null field in which no signal is transmitted or another signal type is transmitted, and

wherein a non-legacy part of the downlink frame and a non-legacy part of the uplink frame are aligned in a specific time duration of the time period.

2. The full-duplex communication method of claim 1 , wherein the AP transmits the downlink frame to a solicited STA which transmits the uplink frame.

3. The full-duplex communication method of claim 1 , wherein the AP transmits the downlink frame to an unsolicited STA.

4. The full-duplex communication method of claim 1 , wherein the reference frame includes a triggered response scheduling (TRS) control field.

5. The full-duplex communication method of claim 1 , wherein the uplink frame is a High-Efficiency Trigger-Based (HE TB) PPDU.

6. The full-duplex communication method of claim 1 ,

wherein the legacy part of the uplink frame includes a pre-HE modulated field of the uplink frame and the non-legacy part of the uplink frame includes an HE modulated field of the uplink frame,

wherein the non-legacy part of the downlink frame includes an HE modulated field of the downlink frame, and

wherein the specific time duration is included in a time period in which the HE modulated field of the uplink frame is received and the HE modulated field of the downlink frame is transmitted.

7. The full-duplex communication method of claim 1 , wherein the specific time duration is a period after a training sequence for the uplink frame is processed in the AP.

8. The full-duplex communication method of claim 1 , wherein the downlink frame and the uplink frame are transmitted in different resource units (RUs) respectively.

9. The full-duplex communication method of claim 1 , wherein the downlink frame and the uplink frame are transmitted in a common resource unit (RU).

10. A full-duplex communication method in a high efficiency wireless local area network (WLAN), the full-duplex communication method being performed by a specific station (STA) in a WLAN network, the method comprising:

receiving a reference frame from an access point (AP);

transmitting an uplink frame to the AP in a time period determined on a basis of the reference frame; and

receiving a downlink frame from the AP in a specific time duration of the time period determined by the reference frame,

wherein the reference frame is transmitted to a plurality of STAs including the specific STA,

wherein the time period is a period in which at least one of the plurality of STAs is solicited to transmit an uplink frame to the AP,

wherein the uplink frame and the downlink frame aligned at frame boundaries in the time period are transmitted simultaneously through a same channel,

wherein a legacy part of the downlink frame is a null field in which, and

wherein a non-legacy part of the downlink frame and a non-legacy part of the uplink frame are aligned in a specific time duration of the time period.

11. The full-duplex communication method of claim 10 , wherein the uplink frame is a High-Efficiency Trigger-Based (HE TB) PPDU.

12. The full-duplex communication method of claim 10 ,

wherein the legacy part of the uplink frame includes a pre-HE modulated field of the uplink frame and the non-legacy part of the uplink frame includes an HE modulated field of the uplink frame,

wherein the non-legacy part of the downlink frame includes an HE modulated field of the downlink frame, and

wherein the specific time duration is included in a time period in which the HE modulated field of the downlink frame is received and the HE modulated field of the uplink frame is transmitted.

13. The full-duplex communication method of claim 10 , wherein the downlink frame and the uplink frame are transmitted in different resource units (RUs) respectively.

14. The full-duplex communication method of claim 10 , wherein the downlink frame and the uplink frame are transmitted in a common resource unit (RU).

15. A station apparatus for performing full-duplex communication in a high efficiency wireless local area network (WLAN), the station apparatus comprising:

a communication device configured to receive a reference frame from an access point (AP) in a WLAN, transmit an uplink frame to the AP in a time period, and receive a downlink frame from the AP in a specific time duration of the time period; and

a processor configured to determine the time period or the specific time duration based on the reference frame and process the downlink frame transmitted in the specific time duration,

wherein the reference frame is transmitted to a plurality of stations including the station apparatus,

wherein the time period is a period in which at least one of the plurality of stations transmits an uplink frame to the AP,

wherein the uplink frame and the downlink frame aligned at frame boundaries in the time period are transmitted simultaneously through a same channel,

wherein a legacy part of the downlink frame is a null field in which no signal is transmitted or another signal type is transmitted, and

wherein a non-legacy part of the downlink frame and a non-legacy part of the uplink frame are aligned in a specific time duration of the time period.

16. The station apparatus of claim 15 , wherein the communication device transmits a High-Efficiency Trigger-Based (HE TB) PPDU to the AP as the uplink frame.

17. The station apparatus of claim 15 , wherein the legacy part of the uplink frame includes a pre-HE modulated field of the uplink frame and the non-legacy part of the uplink frame includes an HE modulated field of the uplink frame,

wherein the non-legacy part of the downlink frame includes an HE modulated field of the downlink frame, and

wherein the specific time duration is included in a time period in which the HE modulated field of the downlink frame is received and the HE modulated field of the uplink frame is transmitted.

18. The station apparatus of claim 15 , wherein the downlink frame and the uplink frame are transmitted in individual resource units (RUs) respectively.

19. The station apparatus of claim 15 , wherein the downlink frame and the uplink frame are transmitted in a common resource unit (RU).