Method for transmitting or receiving wake-up radio packet in wireless LAN system and device therefor

Patent metadata

Field	Value
Publication number	US-10925000-B2
Application number	US-201716464662-A
Country	US
Kind code	B2
Filing date	Nov 28, 2017
Priority date	Nov 28, 2016
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A method for transmitting a wake-up radio (WUR) packet by an access point (AP) in a wireless LAN (WLAN) system according to an embodiment of the present invention comprises the steps of: generating a WUR packet including a legacy preamble and a plurality of on-symbols; and transmitting the WUR packet to a station (STA), wherein a subcarrier sequence for generating the plurality of on-symbols may be determined on the basis of a legacy training field sequence that configures the legacy preamble.

First claim

What is claimed is:

1. A method for transmitting a wake-up radio (WUR) packet by an access point (AP) in a wireless local area network (WLAN) system, the method comprising:
generating a WUR packet comprising a legacy preamble and a plurality of on-symbols; and
transmitting the WUR packet to a station (STA),
wherein a subcarrier sequence for generating the plurality of on-symbols is determined based on a very high throughput-short training field (VHT-STF), and
wherein the subcarrier sequence is ±[1, −1, 1, −1, −1, 1, 0, −1, −1, 1, 1, 1, 1].

2. The method of claim 1 , wherein a length of the subcarrier sequence is determined based on a frequency band allocated for the plurality of on-symbols.

3. The method of claim 2 , wherein the frequency band allocated for the plurality of on-symbols is set as a partial frequency band of a transmission band for the WLAN system, and
the subcarrier sequence is set to generate the plurality of on-symbols.

4. The method of claim 3 , wherein the partial frequency band is set to 4 MHz.

5. The method of claim 1 , wherein the plurality of on-symbols is allocated by on-off keying (OOK) modulation.

6. The method of claim 1 , further comprising:
mapping the subcarrier sequence to some of a plurality of all subcarriers forming a transmission band for the WLAN system,
wherein the subcarrier sequence is mapped to a plurality of consecutive subcarriers among the plurality of all subcarriers.

7. The method of claim 6 , wherein a center of the subcarrier sequence is mapped to a center of the plurality of all subcarriers.

8. The method of claim 1 , wherein the WUR payload comprises a plurality of on-symbols for a plurality of STAs,
the plurality of on-symbols for the plurality of STAs is multiplexed on one symbol period, and
different phase rotations are applied to the respective multiplexed on-symbols.

9. A device for transmitting a wake-up radio (WUR) packet in a wireless local area network (WLAN) system, the device comprising:
a transceiver; and
a processor,
wherein the processor generates a WUR packet comprising a legacy preamble and a plurality of on-symbols and transmits the WUR packet to a station (STA), and
a subcarrier sequence for generating the plurality of on-symbols is determined based on a very high throughput-short training field (VHT-STF), and
wherein the subcarrier sequence is ±[1, −1, 1, −1, −1, 1, 0, −1, −1, 1, 1, 1, 1].

Assignees

• Lg Electronics Inc

Inventors

• Yun Sunwoong
• Park Eunsung
• Lim Dongguk
• Cho Hangyu
• Choi Jinsoo

Classifications

• H04L27/2603

  Signal structure ensuring backward compatibility with legacy system · CPC title

• H04L27/2602

  Signal structure · CPC title

• H04L5/0044

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title

• H04L27/26

  Systems using multi-frequency codes (H04L27/32 takes precedence) · CPC title

• Y02D30/70

  in wireless communication networks · CPC title