Method and device for transmitting/receiving frame in accordance with bandwidth thereof in WLAN system

1. A method for performing a response process in a wireless local access network (WLAN) system, the method comprising:

transmitting, by a first station (STA), a frame requiring a response frame to a second STA;

waiting, by the first STA, for the response frame during an ACKTimeout interval configured differently according to whether a preamble channel bandwidth type of the frame is a 1 MHz preamble type or is a 2 MHz or more preamble type; and

determining, by the first STA, that transmission of the frame has failed and performing, by the first STA, a backoff procedure, when the ACKTimeout interval is ended,

wherein the configured ACKTimeout interval is determined based on a value of an aPHY-RX-START-Delay set to a different value according to whether the preamble channel bandwidth type of the frame is the 1 MHz preamble type or is the 2 MHz or more preamble type, and

wherein a preamble channel bandwidth of the response frame is set to a value equal to the preamble channel bandwidth type of the frame.

2. The method according to claim 1 ,

wherein, if the preamble channel bandwidth type of the frame is the 1 MHz preamble type, the ACKTimeout interval is calculated based on the aPHY-RX-START-Delay value for the 1 MHz preamble type,

wherein the aPHY-RX-S TART-Delay value indicates a delay time until a Physical Layer Convergence Procedure (PLCP) Packet Data Unit (PPDU) having a valid PLCP header starts to be received.

3. The method according to claim 1 ,

wherein, if the preamble channel bandwidth type of the frame is the 2 MHz or more preamble type, the ACKTimeout interval is calculated based on the aPHY-RX-START-Delay value for the 2 MHz or more preamble type,

wherein the aPHY-RX-START-Delay indicates a delay time until a Physical Layer Convergence Procedure (PLCP) Packet Data Unit (PPDU) having a valid PLCP header starts to be received.

4. The method according to claim 1 ,

wherein the frame is one of a data frame, a Request To Send (RTS) frame, and a Power Save-Poll (PS-Poll) frame.

5. The method according to claim 1 ,

wherein the response frame is one of an Acknowledgement (ACK) frame, a Clear To Send (CTS) frame, and a data frame.

6. The method according to claim 1 ,

wherein the STA is an STA operating in a Sub-1 GHz (S1G) frequency band.

7. The method according to claim 1 , wherein a value of the aPHY-RX-START-Delay when the preamble channel bandwidth type of the frame is the 1 MHz preamble type is greater by 320 micro-seconds than a value of aPHY-RX-START-Delay when the preamble channel bandwidth type of the frame is the 2 MHz or more preamble type.

8. The method according to claim 1 , wherein the backoff procedure includes a retransmission of the frame.

9. A station (STA) for performing a response process in a wireless local access network (WLAN) system, the STA comprising:

a transceiver; and

a processor,

wherein the processor:

controls the transceiver to transmit a frame requiring a response frame to a second STA through the transceiver;

waits for the response frame during an ACKTimeout interval configured differently according to whether a preamble channel bandwidth type of the frame is a 1 MHz preamble type or is a 2 MHz or more preamble type; and

determines that transmission of the frame has failed and performing, by the first STA, a backoff procedure, when the ACKTimeout interval is ended,

wherein the configured ACKTimeout interval is determined based on a value of an aPHY-RX-START-Delay set to a different value according to whether the preamble channel bandwidth type of the frame is the 1 MHz preamble type or is the 2 MHz or more preamble type, and

wherein a preamble channel bandwidth of the response frame is set to a value equal to the preamble channel bandwidth type of the frame.

10. The STA according to claim 9 ,

wherein, if the preamble channel bandwidth type of the frame is the 1 MHz preamble type, the ACKTimeout interval is calculated based on the aPHY-RX-START-Delay value for the 1 MHz preamble type, and

wherein the aPHY-RX-S TART-Delay value indicates a delay time until a Physical Layer Convergence Procedure (PLCP) Packet Data Unit (PPDU) having a valid PLCP header starts to be received.

11. The STA according to claim 9 ,

wherein, if the preamble channel bandwidth type of the frame is of the 2 MHz or more preamble type, the ACKTimeout interval is calculated based on the aPHY-RX-START-Delay value for the 2 MHz or more preamble type, and

wherein the aPHY-RX-START-Delay indicates a delay time until a Physical Layer Convergence Procedure (PLCP) Packet Data Unit (PPDU) having a valid PLCP header starts to be received.

12. The STA according to claim 9 , wherein the frame is one of a data frame, a Request To Send (RTS) frame, and a Power Save-Poll (PS-Poll) frame.

13. The STA according to claim 9 , wherein the response frame is one of an Acknowledgement (ACK) frame, a Clear To Send (CTS) frame, and a data frame.

14. The STA according to claim 9 , wherein the STA is an STA operating in a Sub-1 GHz (S1G) frequency band.

15. The STA according to claim 9 , wherein a value of the aPHY-RX-START-Delay when the preamble channel bandwidth type of the frame is the 1 MHz preamble type is greater by 320 micro-seconds than a value of aPHY-RX-START-Delay when the preamble channel bandwidth type of the frame is the 2 MHz or more preamble type.

16. The STA according to claim 9 , wherein the backoff procedure includes a retransmission of the frame.