# US 11,451,421 B2 · Method and apparatus for transmitting wake-up packet in wireless LAN system

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- Number: US 11,451,421 B2
- Document ID: US11451421B2
- Status: Granted
- Kind: B2
- Application number: 16/494,751
- Filed: 2018-03-20
- Published: 2020-04-02
- Granted: 2022-09-20
- Earliest claimed: 2017-03-22
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Eunsung Park; Jinyoung Chun; Jinsoo Choi; Dongguk Lim
- Web page: https://patentgrep.com/patent/US11451421B2

## CPC

- H04W 52/0229: {where the received signal is a wanted signal}
- H04L 27/02: Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation (H04L27/32 takes precedence)
- H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)}
- H04L 27/2605: {Symbol extensions, e.g. Zero Tail, Unique Word [UW]}
- H04L 27/2607: {Cyclic extensions}
- H04L 27/2628: {Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators (H04L27/2634 takes precedence)}
- H04W 52/02: Power saving arrangements
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04L 25/4904: {using self-synchronising codes, e.g. split-phase codes}
- H04W 84/12: WLAN [Wireless Local Area Networks]
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

Proposed are a method and an apparatus for transmitting a wake-up frame in a wireless LAN system. Specifically, a transmission apparatus configures a wake-up frame to which an OOK scheme is applied, and transmits the wake-up frame to a reception apparatus. The wake-up frame comprises an on-signal and an off-signal. The on-signal is configured using a signal obtained by masking one-half of a signal obtained by inserting a CP into a first time domain signal. The first time domain signal is generated by inserting coefficients into 13 consecutive subcarriers in a 20 MHz band and performing 64-point IFFT on the 13 consecutive subcarriers. A signal placed at a front part of the on-signal is nulled.

## Claims

### Claim 1

A method of transmitting a wake-up frame in a wireless LAN system, the method comprising:
generating, by a transmitting apparatus, a wake-up frame to which an on-off keying (OOK) method is applied; and
transmitting, by the transmitting apparatus, the wake-up frame to a receiving apparatus,
wherein the wake-up frame is configured with an on signal and an off signal,
the on signal is configured with a signal obtained by masking half of a signal in which a cyclic prefix (CP) has been inserted into a first time domain signal,
the first time domain signal is generated by inserting a coefficient into contiguous 13 subcarriers of a 20 MHz band and performing 64-point inverse fast Fourier transform (IFFT), and
a signal located at a front part of the on signal is nulled.

### Claim 2 (depends on 1)

The method of claim 1, wherein:
the signal in which the CP has been inserted into the first time domain signal has a length of 4 μs, and
the on signal has a length of 2 μs.

### Claim 3 (depends on 2)

The method of claim 2, wherein if the transmitting apparatus and the receiving apparatus are located in an indoor channel environment, the signal located at the front part of the on signal has a length of 0.4 μs.

### Claim 4 (depends on 2)

The method of claim 2, wherein if the transmitting apparatus and the receiving apparatus are located in an outdoor channel environment, the signal located at the front part of the on signal has a length of 0.8 μs.

### Claim 5 (depends on 1)

The method of claim 1, wherein:
the off signal is configured with a signal obtained by masking half of a signal in which a CP has been inserted into a second time domain signal,
the second time domain signal is generated by inserting 0 into contiguous 13 subcarriers of a 20 MHz band and performing 64-point IFFT, and
the off signal has a length of 2 μs.

### Claim 6 (depends on 5)

The method of claim 5, wherein:
the wake-up frame comprises a symbol on which first information or second information is transmitted,
the first information is configured in order of the on signal and the off signal,
the second information is configured in order of the off signal and the on signal, and
the symbol on which the first information or the second information is transmitted has a length of 4 μs.

### Claim 7 (depends on 6)

The method of claim 6, wherein a data rate of the symbol on which the first information or the second information is 250 Kbps.

### Claim 8 (depends on 1)

The method of claim 1, wherein:
the coefficient has been inserted into all the 13 subcarriers, and
the first time domain signal is a signal having a length of 3.2 μs not having a period.

### Claim 9

A transmitting apparatus transmitting a wake-up frame in a wireless LAN system, the apparatus comprising:
a transceiver transmitting or receiving a radio signal; and
a processor configured to control the transceiver, wherein the processor is configured to:
generate a wake-up frame to which an on-off keying (OOK) method is applied; and
transmit the wake-up frame to a receiving apparatus,
wherein the wake-up frame is configured with an on signal and an off signal,
the on signal is configured with a signal obtained by masking half of a signal in which a cyclic prefix (CP) has been inserted into a first time domain signal,
the first time domain signal is generated by inserting a coefficient into contiguous 13 subcarriers of a 20 MHz band and performing 64-point inverse fast Fourier transform (IFFT), and
a signal located at a front part of the on signal is nulled.

### Claim 10 (depends on 9)

The transmitting apparatus of claim 9, wherein:
the signal in which the CP has been inserted into the first time domain signal has a length of 4 μs, and
the on signal has a length of 2 μs.

### Claim 11 (depends on 10)

The transmitting apparatus of claim 10, wherein if the transmitting apparatus and the receiving apparatus are located in an indoor channel environment, the signal located at the front part of the on signal has a length of 0.4 μs.

### Claim 12 (depends on 10)

The transmitting apparatus of claim 10, wherein if the transmitting apparatus and the receiving apparatus are located in an outdoor channel environment, the signal located at the front part of the on signal has a length of 0.8 μs.

### Claim 13 (depends on 9)

The transmitting apparatus of claim 9, wherein:
the off signal is configured with a signal obtained by masking half of a signal in which a CP has been inserted into a second time domain signal,
the second time domain signal is generated by inserting 0 into contiguous 13 subcarriers of a 20 MHz band and performing 64-point IFFT, and
the off signal has a length of 2 μs.

### Claim 14 (depends on 13)

The transmitting apparatus of claim 13, wherein:
the wake-up frame comprises a symbol on which first information or second information is transmitted,
the first information is configured in order of the on signal and the off signal,
the second information is configured in order of the off signal and the on signal, and
the symbol on which the first information or the second information is transmitted has a length of 4 μs.

### Claim 15 (depends on 14)

The transmitting apparatus of claim 14, wherein a data rate of the symbol on which the first information or the second information is 250 Kbps.

### Claim 16 (depends on 9)

The transmitting apparatus of claim 9, wherein:
the coefficient has been inserted into all the 13 subcarriers, and
the first time domain signal is a signal having a length of 3.2 μs not having a period.