Method and device for transmitting wakeup packet in wireless LAN system
A method and a device for transmitting a wakeup packet in a wireless LAN system are suggested. Particularly, a transmission device configures a wakeup packet and transmits same to a reception device. The wakeup packet includes a sequence including first information and second information, by applying an OOK method. The first information and the second formation are configured with an on-signal and an off-signal. The on-signal is transferred via a first symbol generated by applying a first sequence to K number of successive subcarriers in the 20 MHz band and performing 64-point IFFT on the subcarriers. The offsignal is transferred via a second symbol generated by applying a second sequence to the K number of successive subcarriers in the 20 MHz band and performing 64-point IFNT on the subcarriers. Of the K number of subcarriers to which the first sequence is applied, a coefficient for m number of subcarriers as a unit is set to 1 or −1 for the subcarriers, and a coefficient for the remaining subcarriers is set to 0. The first information and the second information are transmitted via a third symbol configured with the first symbol and the second symbol, respectively.
1. A method of transmitting a wake-up packet in a wireless LAN system, the method comprising:
generating, by a transmitting device, a wake-up packet; and
transmitting, by the transmitting device, the wake-up packet to a receiving device,
wherein the wake-up packet includes a sequence being configured of first information and second information by applying an On-Off Keying (OOK) scheme,
wherein the first information and the second information are configured of an ON-signal and an OFF-signal,
wherein the ON-signal is transmitted via a first symbol, the first symbol being generated by applying a first sequence on K consecutive subcarriers of a 20 MHz band and by performing 64-point Inverse Fast Fourier Transform (IFFT),
wherein the OFF-signal is transmitted via a second symbol, the second symbol being generated by applying a second sequence on K consecutive subcarriers of a 20 MHz band and by performing 64-point IFFT,
wherein, in K subcarriers to which the first sequence is applied, coefficients of the subcarriers are set to 1 or −1 in m subcarrier units, and coefficients of the remaining subcarriers are set to 0,
wherein each of the first information and the second information is transmitted via a third symbol, the third symbol being configured of the first symbol and the second symbol,
wherein K and m are integers,
wherein the K subcarriers relate to partial bands of the 20 MHz band,
wherein subcarrier spacing of each of the K subcarriers relates to 312.5 KHz,
wherein, in case m=4, the first symbol and the second symbol have a length of 0.8 us and
wherein, in case m=8, the first symbol and the second symbol have a length of 0.4 us.
2. The method of claim 1 , wherein Information 0 is configured by an order of an ON-signal and an OFF-signal, and Information 1 is configured by an order of an OFF-signal and an ON-signal, or
wherein Information 0 is configured by an order of an OFF-signal and an ON-signal, and Information 1 is configured by an order of an ON-signal and an OFF-signal.
3. The method of claim 2 , wherein the ON-signal indicates 1, and wherein the OFF-signal indicates 0.
4. The method of claim 2 , wherein the wake-up packet includes a wake-up preamble and a wake-up payload, and
wherein the third symbol is included in the wake-up payload.
5. The method of claim 4 , wherein, in case m is equal to 4, a data rate of the wake-up payload is equal to 500 Kbps, and
wherein, in case m is equal to 8, a data rate of the wake-up payload is equal to 1 Mbps.
6. The method of claim 5 , wherein the wake-up preamble includes an indicator for indicating the data rate of the wake-up payload, and
wherein the indicator includes information on types of the first symbol and the second symbol or includes information on a value of m.
7. The method of claim 1 , wherein the first sequence and the second sequence are different from one another, and
wherein, in K subcarriers to which the second sequence is applied, coefficients of all subcarriers are set to 0.
8. The method of claim 1 , wherein each of the first information and the second information includes a cyclic prefix (CP), and
wherein the CP is inserted in front of each of the first symbol and the second sym bol.
9. The method of claim 8 , wherein, in case m=4, the CP has a length of 0.2 us, and
wherein, in case m=8, the CP has a length of 0.1 us.
10. A transmitting device for transmitting a wake-up packet in a wireless LAN system, the transmitting device comprising:
a radio frequency (RF) unit transmitting or receiving radio signals; and
a processor controlling the RF unit,
wherein the processor is configured to:
generate a wake-up packet, and
transmit the wake-up packet to a receiving device,
wherein the wake-up packet includes a sequence being configured of first information and second information by applying an On-Off Keying (OOK) scheme,
wherein the first information and the second information are configured of an ON-signal and an OFF-signal,
wherein the ON-signal is transmitted via a first symbol, the first symbol being generated by applying a first sequence on K consecutive subcarriers of a 20 MHz band and by performing 64-point Inverse Fast Fourier Transform (IFFT),
wherein the OFF-signal is transmitted via a second symbol, the second symbol being generated by applying a second sequence on K consecutive subcarriers of a 20 MHz band and by performing 64-point IFFT,
wherein, in K subcarriers to which the first sequence is applied, coefficients of the subcarriers are set to 1 or −1 in m subcarrier units, and coefficients of the remaining subcarriers are set to 0,
wherein each of the first information and the second information is transmitted via a third symbol, the third symbol being configured of the first symbol and the second symbol,
wherein K and m are integers,
wherein the K subcarriers relate to partial bands of the 20 MHz band,
wherein subcarrier spacing of each of the K subcarriers relates to 312.5 KHz,
wherein, in case m=4, the first symbol and the second symbol have a length of 0.8 us and
wherein, in case m=8, the first symbol and the second symbol have a length of 0.4 us.
11. The transmitting device of claim 10 , wherein Information 0 is configured by an order of an ON-signal and an OFF-signal, and Information 1 is configured by an order of an OFF-signal and an ON-signal, or
wherein Information 0 is configured by an order of an OFF-signal and an ON-signal, and Information 1 is configured by an order of an ON-signal and an OFF-signal.
12. The transmitting device of claim 11 , wherein the ON-signal indicates 1, and
wherein the OFF-signal indicates 0.
13. The transmitting device of claim 11 , wherein the wake-up packet includes a wake-up preamble and a wake-up payload, and
wherein the third symbol is included in the wake-up payload.
14. The transmitting device of claim 13 , wherein, in case m is equal to 4, a data rate of the wake-up payload is equal to 500 Kbps, and
wherein, in case m is equal to 8, a data rate of the wake-up payload is equal to 1 Mbps.
15. The transmitting device of claim 14 , wherein the wake-up preamble includes an indicator for indicating the data rate of the wake-up payload, and
wherein the indicator includes information on types of the first symbol and the second symbol or includes information on a value of m.
16. The transmitting device of claim 10 , wherein the first sequence and the second sequence are different from one another, and
wherein, in K subcarriers to which the second sequence is applied, coefficients of all subcarriers are set to 0.
17. The transmitting device of claim 10 , wherein each of the first information and the second information includes a cyclic prefix (CP), and
wherein the CP is inserted in front of each of the first symbol and the second symbol.
18. The transmitting device of claim 17 , wherein, in case m=4, the CP has a length of 0.2 us, and
wherein, in case m=8, the CP has a length of 0.1 us.