Method for identifying format of PPDU in wireless communication system
One example according to the present specification relates to a method for identifying the format of a PPDU in a wireless LAN (WLAN) system. A receiving STA may receive a first PPDU. The receiving STA may check at least one extra tone of at least one symbol of the first PPDU. The receiving STA may determine, on the basis of the at least one extra tone, the format of the first PPDU as a repeated PPDU format. Thereafter, the receiving STA may receive a second PPDU including the same data as the first PPDU.
1. A method in a wireless local area network system, the method comprising:
receiving, by a receiving STA from a transmitting STA, a first Physical Protocol Data Unit (PPDU), wherein at least one symbol of the first PPDU includes at least one extra tone;
determining, by the receiving STA, the format of the first PPDU as a repeated PPDU format based on the at least one extra tone; and
receiving, by the receiving STA from the transmitting STA, a second PPDU including the same data as the first PPDU based on the format of the first PPDU, wherein the first PPDU and the second PPDU are received through a 5.9 GHz band based on a frequency spacing of 156.25 kHz.
2. The method of claim 1 , wherein a subcarrier index of the at least one extra tone is set to [−27, 27].
3. The method of claim 1 , wherein a subcarrier index of the at least one extra tone is set to [−28, −27, 27, 28].
4. The method of claim 1 , wherein the at least one extra tone is set to one of a first value and a second value.
5. The method of claim 1 , wherein the method further comprises,
checking, by the receiving STA, whether average power of the at least one extra tone exceeds a specified value.
6. The method of claim 1 , wherein the method further comprises,
checking, by the receiving STA, whether the at least one extra tone is set to a specified sequence.
7. The method of claim 1 , wherein the method further comprises,
determining, by the receiving STA, a number of PPDU including the same data as the first PPDU, based on the first PPDU.
8. The method of claim 1 , wherein the at least one symbol includes at least a portion of a data field and an L-SIG field.
9. The method of claim 1 , wherein the first PPDU and the second PPDU are set to 10 MHz.
10. The method of claim 1 , wherein the receiving STA supports the first type of PPDU and the second type of PPDU, and
wherein the first PPDU and the second PPDU are configured as the first type of PPDU.
11. The method of claim 10 , wherein the first type of PPDU includes a legacy PPDU, and
wherein the second type of PPDU includes a Next Generation Vehicular network (NGV) PPDU.
12. The method of claim 1 , wherein the method further comprises,
determining, by the receiving STA, a format of the second PPDU as a repeated PPDU format based on the second PPDU;
stopping, by the receiving STA, decoding the second PPDU; and
deferring, by the receiving STA, channel access based on a length of the second PPDU.
13. A method in a wireless local area network system, the method comprising:
transmitting, by the transmitting STA, a first Physical Protocol Data Unit (PPDU), wherein at least one symbol of the first PPDU includes at least one extra tone; and
transmitting, by the transmitting STA, a second PPDU including the same data as the first PPDU, wherein the first PPDU and the second PPDU are transmitted through a 5.9 GHZ band based on a frequency spacing of 156.25 kHz.
14. A receiving STA in a wireless local area network system, the receiving STA comprises,
a transceiver for receiving a radio signal; and
a processor being coupled to the transceiver, wherein the processor is configured to:
receive, from a transmitting STA, a first Physical Protocol Data Unit (PPDU);
determine a format of the first PPDU as a repeated PPDU format based on at least one extra tone included in at least one symbol of the first PPDU;
receive a second PPDU including the same data as the first PPDU, based on the format of the first PPDU,
wherein the first PPDU and the second PPDU are received through a 5.9 GHz band based on a frequency spacing of 156.25 kHz.
15. The receiving STA of claim 14 , wherein a subcarrier index of the at least one extra tone is set to [−27, 27].
16. The receiving STA of claim 14 , wherein a subcarrier index of the at least one extra tone is set to [−28, −27, 27, 28].
17. The receiving STA of claim 14 , wherein the at least one symbol includes at least a portion of a data field and an L-SIG field.