Method and apparatus for receiving PPDU in wireless LAN system
Proposed are a method and an apparatus for receiving a PPDU in a wireless LAN system. Specifically, a receiving STA receives a PPDU from a transmitting STA via broadband communication and decodes the PPDU. The PPDU is received on the basis of an OFDMA scheme. The PPDU includes a first signal field. The first signal field includes first information on a preamble puncturing pattern for each 80 MHz band in the broadband communication. The first information consists of a 4-bit bitmap for the 80 MHz band.
1. A method in a wireless Local Area Network (LAN) system, the method comprising:
receiving, by a receiving station (STA), a Physical Protocol Data Unit (PPDU) through a broadband from a transmitting STA; and
decoding, by the receiving STA, the PPDU,
wherein the PPDU is received based on an Orthogonal Frequency Division Multiple Access (OFDMA) scheme,
wherein the PPDU includes a first signal field,
wherein the first signal field includes first information on a preamble puncturing pattern for each 80 MHz band in the broadband,
wherein the first information is set as a 4-bit bitmap for each 80 MHz band,
wherein the each 80 MHz band includes first to fourth 20 MHz channels,
wherein the first to fourth 20 MHz channels are arranged in the order of low frequency to high frequency, and
among the 4-bit bitmap, a first bit includes information on whether the first 20 MHz channel is punctured, a second bit includes information on whether the second 20 MHz channel is punctured, and a third bit includes information on whether the third 20 MHz channel is punctured, and a fourth bit includes information on whether the fourth 20 MHz channel is punctured.
2. The method of claim 1 ,
wherein based on a bandwidth of the broadband being 320 MHz, the broadband includes first to fourth 80 MHz channels,
wherein the preamble puncturing pattern for the first 80 MHz channel is determined based on the 4-bit bitmap for the first 80 MHz channel,
wherein the preamble puncturing pattern for the second 80 MHz channel is determined based on the 4-bit bitmap for the second 80 MHz channel,
wherein the preamble puncturing pattern for the third 80 MHz channel is determined based on the 4-bit bitmap for the third 80 MHz channel, and
wherein the preamble puncturing pattern for the fourth 80 MHz channel is determined based on the 4-bit bitmap for the fourth 80 MHz channel.
3. The method of claim 2 , wherein the 4-bit bitmap is set to one of 1111, 0111, 1011, 1101, 1110, 0011, 1100, and 1001.
4. The method of claim 3 , wherein the PPDU further includes a second signal field,
wherein the second signal field includes first signal information duplicated for the first and third 20 MHz channels and second signal information duplicated for the second and fourth 20 MHz channels.
5. The method of claim 4 , wherein when the 4-bit bitmap is set to 0111, the first 20 MHz channel is punctured,
wherein the second signal field includes the first signal information for the third 20 MHz channel and the second signal information for the second and fourth 20 MHz channels.
6. The method of claim 4 , wherein the first signal field is a Universal-Signal (U-SIG) field,
wherein the second signal field is an Extremely High Throughput-Signal (EHT-SIG) field,
wherein the PPDU further includes a data field,
wherein the data field is received through a resource unit determined based on the first and second signal fields.
7. The method of claim 1 , wherein the first signal field includes second information on the bandwidth of the broadband,
wherein the second information consists of 3 bits,
wherein the bandwidth of the broadband is determined as one of 20 MHz, 40 MHz, 80 MHz, 160/80+80 MHz, 240/160+80 MHz, and 320 MHz based on the 3 bits.
8. The method of claim 1 , wherein the preamble puncturing pattern is a pattern in which puncturing is performed in units of 20 MHz in a channel except for a primary 20 MHz channel.
9. A receiving station (STA) in a wireless Local Area Network (LAN), the receiving STA comprising:
a memory;
a transceiver; and
a processor operatively coupled to the memory and the transceiver,
wherein the processor is configured to:
receive a Physical Protocol Data Unit (PPDU) through a broadband from a transmitting STA; and
decode the PPDU,
wherein the PPDU is received based on an Orthogonal Frequency Division Multiple Access (OFDMA) scheme,
wherein the PPDU includes a first signal field,
wherein the first signal field includes first information on a preamble puncturing pattern for each 80 MHz band in the broadband,
wherein the first information is set as a 4-bit bitmap for each 80 MHz band,
wherein the each 80 MHz band includes first to fourth 20 MHz channels,
wherein the first to fourth 20 MHz channels are arranged in the order of low frequency to high frequency, and
among the 4-bit bitmap, a first bit includes information on whether the first 20 MHz channel is punctured, a second bit includes information on whether the second 20 MHz channel is punctured, and a third bit includes information on whether the third 20 MHz channel is punctured, and a fourth bit includes information on whether the fourth 20 MHz channel is punctured.
10. A method in a wireless Local Area Network (LAN), the method comprising:
generating, by a transmitting station (STA), a Physical Protocol Data Unit (PPDU); and
transmitting, by the transmitting STA, the PPDU through a broadband to a receiving STA,
wherein the PPDU is received based on an Orthogonal Frequency Division Multiple Access (OFDMA) scheme,
wherein the PPDU includes a first signal field,
wherein the first signal field includes first information on a preamble puncturing pattern for each 80 MHz band in the broadband,
wherein the first information is set as a 4-bit bitmap for each 80 MHz band,
wherein the each 80 MHz band includes first to fourth 20 MHz channels,
wherein the first to fourth 20 MHz channels are arranged in the order of low frequency to high frequency, and
among the 4-bit bitmap, a first bit includes information on whether the first 20 MHz channel is punctured, a second bit includes information on whether the second 20 MHz channel is punctured, and a third bit includes information on whether the third 20 MHz channel is punctured, and a fourth bit includes information on whether the fourth 20 MHz channel is punctured.
11. The method of claim 10 , wherein based on a bandwidth of the broadband being 320 MHz, the broadband includes first to fourth 80 MHz channels,
wherein the preamble puncturing pattern for the first 80 MHz channel is determined based on the 4-bit bitmap for the first 80 MHz channel,
wherein the preamble puncturing pattern for the second 80 MHz channel is determined based on the 4-bit bitmap for the second 80 MHz channel,
wherein the preamble puncturing pattern for the third 80 MHz channel is determined based on the 4-bit bitmap for the third 80 MHz channel, and
wherein the preamble puncturing pattern for the fourth 80 MHz channel is determined based on the 4-bit bitmap for the fourth 80 MHz channel.
12. The method of claim 11 , wherein the 4-bit bitmap is set to one of 1111, 0111, 1011, 1101, 1110, 0011, 1100, and 1001.
13. The method of claim 12 , wherein the PPDU further includes a second signal field,
wherein the second signal field includes first signal information duplicated for the first and third 20 MHz channels and second signal information duplicated for the second and fourth 20 MHz channels.
14. The method of claim 13 , wherein when the 4-bit bitmap is set to 0111, the first 20 MHz channel is punctured,
wherein the second signal field includes the first signal information for the third 20 MHz channel and the second signal information for the second and fourth 20 MHz channels.