Extended range transmission in wireless local area network
The present specification provides a technical feature for extended range transmission in a wireless LAN signal. A physical protocol data unit (PPDU) of the present specification may include a universal signal (U-SIG) field. The U-SIG field may be received through first to the fourth symbols, the second symbol may include information in which bit information of the first symbol is repeated, and the fourth symbol may include information in which bit information of the third symbol is repeated. The receiving STA of the present specification may determine the transmission mode of the PPDU based on constellation mapping pattern of the first and second symbols.
1. A method in a wireless local area network (WLAN) system, the method comprising:
receiving, by a receiving station (STA), a physical protocol data unit (PPDU),
wherein the PPDU includes a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field which is a repeat of the L-SIG field, and a Universal Signal (U-SIG) field contiguous to the RL-SIG field,
wherein the PPDU is an extremely high throughput (EHT) PPDU,
wherein the L-SIG field includes a length field which is set to a value satisfying a condition that a remainder is zero when the length field is divided by three,
wherein the U-SIG field is received through first through fourth symbols,
wherein the first symbol includes a physical version identifier having a length of three bits,
wherein the physical version identifier is set to zero to identify the EHT PPDU,
wherein the second symbol includes information in which bit information of the first symbol is repeated,
wherein the fourth symbol includes information in which bit information of the third symbol is repeated, and
wherein the PPDU is configured based on one of a plurality of transmission modes including a first mode related to an Extended Range (ER) preamble and a second mode related to duplicate transmission; and
determining, by the receiving STA, a transmission mode of the PPDU based on a constellation mapping pattern of the first and second symbols,
wherein the constellation mapping pattern for the first mode has a first mapping pattern, and
wherein the constellation mapping pattern for the second mode has a second mapping pattern.
2. The method of claim 1 ,
wherein a data field of the PPDU configured based on the second mode is duplicated in frequency.
3. The method of claim 1 ,
wherein a first symbol based on the first mapping pattern is configured based on binary phase shift keying (BPSK) and a second symbol based on the first mapping pattern is configured based on quadrature BPSK (QBPSK), and
wherein a first symbol based on the second mapping pattern is configured based on QBPSK, and a second symbol based on the second mapping pattern is configured based on BPSK.
4. The method of claim 1 ,
wherein a first symbol based on the first mapping pattern is configured based on BPSK, and a second symbol based on the first mapping pattern is configured based on QBPSK, and
wherein a first symbol based on the second mapping pattern is configured based on QBPSK, and a second symbol based on the second mapping pattern is configured based on QBPSK.
5. The method of claim 1 ,
wherein the PPDU further includes an EHT SIG field contiguous to the U-SIG field,
wherein the EHT-SIG field includes a first control signal transmitted through at least one symbol, and a second control signal in which the first control signal is repeated, and
wherein the second control signal is contiguous to the first control signal.
6. The method of claim 1 ,
wherein a bandwidth of the PPDU configured based on the first mode has 20 MHz, and a bandwidth of the PPDU configured based on the second mode has 80 MHz, 160 MHz, or 320 MHz.
7. The method of claim 1 ,
wherein the PPDU is used for single user (SU) communication,
wherein a data field of the PPDU configured based on the first mode supports a single resource unit (RU) and a multiple RU (MRU),
wherein a data field of the PPDU configured based on the second mode supports only a single RU.
8. The method of claim 1 ,
wherein the third and fourth symbols are configured based on BPSK.
9. A method in a wireless local area network (WLAN) system, the method comprising:
configuring, by a transmitting station (STA), a physical protocol data unit (PPDU),
wherein the PPDU includes a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field which is a repeat of the L-SIG field, and a Universal Signal (U-SIG) field contiguous to the RL-SIG field,
wherein the PPDU is an extremely high throughput (EHT) PPDU,
wherein the L-SIG field includes a length field which is set to a value satisfying a condition that a remainder is zero when the length field is divided by three,
wherein the U-SIG field is transmitted through first through fourth symbols,
wherein the first symbol includes a physical version identifier having a length of three bits,
wherein the physical version identifier is set to zero to identify the EHT PPDU,
wherein the second symbol includes information in which bit information of the first symbol is repeated,
wherein the fourth symbol includes information in which bit information of the third symbol is repeated,
wherein the PPDU is configured based on one of a plurality of transmission modes including a first mode related to an Extended Range (ER) preamble and a second mode related to duplicate transmission,
wherein a constellation mapping pattern of the first and second symbols is determined based on a transmission mode of the PPDU, and
wherein the constellation mapping pattern for the first mode has a first mapping pattern, and the constellation mapping pattern for the second mode has a second mapping pattern;
transmitting, by the transmitting STA, the PPDU to a receiving STA.
10. A receiving station (STA) in a wireless local area network (WLAN) system, the receiving STA comprises,
a transceiver for transmitting and receiving radio signals; and
a processor being operably coupled to the transceiver,
wherein the processor is configured to:
control the transceiver to receive a physical protocol data unit (PPDU),
wherein the PPDU includes a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field which is a repeat of the L-SIG field, and a Universal Signal (U-SIG) field contiguous to the RL-SIG field,
wherein the PPDU is an extremely high throughput (EHT) PPDU,
wherein the L-SIG field includes a length field which is set to a value satisfying a condition that a remainder is zero when the length field is divided by three,
wherein the U-SIG field is received through first through fourth symbols,
wherein the first symbol includes a physical version identifier having a length of three bits,
wherein the physical version identifier is set to zero to identify the EHT PPDU,
wherein the second symbol includes information in which bit information of the first symbol is repeated,
wherein the fourth symbol includes information in which bit information of the third symbol is repeated, and
wherein the PPDU is configured based on one of a plurality of transmission modes including a first mode related to an Extended Range (ER) preamble and a second mode related to duplicate transmission; and
determine a transmission mode of the PPDU based on a constellation mapping pattern of the first and second symbols,
wherein the constellation mapping pattern for the first mode has a first mapping pattern, and
wherein the constellation mapping pattern for the second mode has a second mapping pattern.
11. The receiving STA of claim 10 ,
wherein a data field of the PPDU configured based on the second mode is duplicated in frequency.
12. The receiving STA of claim 10 ,
wherein a first symbol based on the first mapping pattern is configured based on binary phase shift keying (BPSK) and a second symbol based on the first mapping pattern is configured based on quadrature BPSK (QBPSK), and
wherein a first symbol based on the second mapping pattern is configured based on QBPSK, and a second symbol based on the second mapping pattern is configured based on BPSK.
13. The receiving STA of claim 10 ,
wherein a first symbol based on the first mapping pattern is configured based on BPSK, and a second symbol based on the first mapping pattern is configured based on QBPSK, and
wherein a first symbol based on the second mapping pattern is configured based on QBPSK, and a second symbol based on the second mapping pattern is configured based on QBPSK.
14. The receiving STA of claim 10 ,
wherein the PPDU further includes an EHT SIG field contiguous to the U-SIG field,
wherein the EHT-SIG field includes a first control signal transmitted through at least one symbol, and a second control signal in which the first control signal is repeated, and
wherein the second control signal is contiguous to the first control signal.
15. The receiving STA of claim 10 ,
wherein a bandwidth of the PPDU configured based on the first mode has 20 MHz, and a bandwidth of the PPDU configured based on the second mode has 80 MHz, 160 MHz, or 320 MHz.
16. The receiving STA of claim 10 ,
wherein the PPDU is used for single user (SU) communication,
wherein a data field of the PPDU configured based on the first mode supports a single resource unit (RU) and a multiple RU (MRU),
wherein a data field of the PPDU configured based on the second mode supports only a single RU.
17. The receiving STA of claim 10 ,
wherein the third and fourth symbols are configured based on BPSK.