Channel access mechanism for low power wake-up receivers

Patent metadata

Field	Value
Publication number	US-12563491-B2
Application number	US-202318168499-A
Country	US
Kind code	B2
Filing date	Feb 13, 2023
Priority date	Mar 18, 2022
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

A method performed by a wireless device operating as an access point in a wireless network to allocate a restricted access window (RAW) for wake-up receiver stations. The method includes generating a beacon frame, wherein the beacon frame includes information regarding a RAW that is allocated for one or more wake-up receiver stations, wherein each of the one or more wake-up receiver stations includes a main radio and a wake-up receiver and wirelessly transmitting the beacon frame.

First claim

What is claimed is:

1 . A method performed by a wireless device operating as an access point in a wireless network to allocate a restricted access window (RAW) for wake-up receiver stations, the method comprising:
generating a beacon frame, wherein the beacon frame includes information regarding a RAW that is allocated for one or more wake-up receiver stations, wherein each of the one or more wake-up receiver stations includes a main radio and a wake-up receiver; wirelessly transmitting the beacon frame, wherein the wireless transmission of the beacon frame causes a wake-up receiver station from the one or more wake-up receiver stations to transition from being in a deep sleep mode to being in a normal sleep mode when the RAW begins, wherein when the wake-up receiver station is in the deep sleep mode, both a main radio of the wake-up receiver station and a wake-up receiver of the wake-up receiver station are turned off, wherein when the wake-up receiver station is in the normal sleep mode, the main radio of the wake-up receiver station is turned off but the wake-up receiver of the wake-up receiver station is turned on; and wirelessly transmitting a wake-up packet to the wake-up receiver station during the RAW, wherein the wireless transmission of the wake-up packet causes the wake-up receiver station to transition from being in the normal sleep mode to being in an active mode, wherein when the wake-up receiver station is in the active mode the main radio of the wake-up receiver station is turned on.

2 . The method of claim 1 , wherein the wake-up packet is wirelessly transmitted using a green-field format.

3 . The method of claim 1 , further comprising:
wirelessly transmitting a data frame to the wake-up receiver station during the RAW after wirelessly transmitting the wake-up packet to the wake-up receiver station.

4 . The method of claim 1 , wherein the wake-up packet is wirelessly transmitted using a mixed-mode format that includes a legacy preamble portion and a data portion, wherein the legacy preamble portion is decodable by stations that are not wake-up receiver stations and the data portion is decodable by wake-up receiver stations.

5 . The method of claim 4 , wherein the legacy preamble portion is wirelessly transmitted using a first bandwidth and the data portion is wirelessly transmitted using a second bandwidth that is lower than the first bandwidth.

6 . The method of claim 5 , wherein the data portion includes a wake-up receiver preamble portion and a wake-up receiver data portion.

7 . The method of claim 6 , wherein the data portion is wirelessly transmitted using an on-off keying (OOK) modulation scheme.

8 . The method of claim 4 , wherein the wake-up packet is wirelessly transmitted in a sub-1 Gigahertz (GHz) band.

9 . The method of claim 1 , wherein the beacon frame further includes information regarding another RAW that is allocated for one or more stations that are not wake-up receiver stations, wherein the wireless transmission of the beacon frame causes a wake-up receiver station to be in a deep sleep mode during the another RAW.

10 . The method of claim 9 , wherein the wireless transmission of the beacon frame further causes stations that are not wake-up receiver stations to avoid wireless transmissions during the RAW.

11 . The method of claim 1 , wherein the information regarding the RAW includes one or more association identifiers (AIDs) corresponding to the one or more wake-up receiver stations.

12 . The method of claim 1 , wherein the information regarding the RAW includes information regarding a timing of the RAW.

13 . The method of claim 1 , wherein the beacon frame further includes information regarding an interval with which the access point will wirelessly transmit future beacon frames that include information regarding RAWs that are allocated for wake-up receiver stations.

14 . The method of claim 1 , wherein the beacon frame includes a RAW parameter set (RPS) element that includes a raw-type field and a raw-type options field, wherein a value of the raw-type field is set to binary ‘00’ and a value of the raw-type options field is set to binary ‘01’ to indicate that the RAW is allocated for wake-up receiver stations.

15 . The method of claim 1 , wherein the beacon frame includes a RAW parameter set (RPS) element that includes a raw-type field and a raw-type options field, wherein a value of the raw-type field is set to binary ‘10’ and a value of the raw-type options field is set to binary ‘11’ to indicate that the RAW is allocated for wake-up receiver stations.

16 . The method of claim 1 , wherein the beacon frame further includes information regarding an interval with which RAWs that are allocated for wake-up receiver stations occurs.

17 . A wireless device that is to operate as an access point in a wireless network, the wireless device comprising:
a radio frequency transceiver; a memory device storing a set of instructions; and a processor coupled to the memory device, wherein the set of instructions when executed by the processor causes the wireless device to:
generate a beacon frame, wherein the beacon frame includes information regarding a RAW that is allocated for one or more wake-up receiver stations, wherein each of the one or more wake-up receiver stations includes a main radio and a wake-up receiver,
wirelessly transmit the beacon frame, wherein the wireless transmission of the beacon frame causes a wake-up receiver station from the one or more wake-up receiver stations to transition from being in a deep sleep mode to being in a normal sleep mode when the RAW begins, wherein when the wake-up receiver station is in the deep sleep mode, both a main radio of the wake-up receiver station and a wake-up receiver of the wake-up receiver station are turned off, wherein when the wake-up receiver station is in the normal sleep mode, the main radio of the wake-up receiver station is turned off but the wake-up receiver of the wake-up receiver station is turned on, and
wirelessly transmit a wake-up packet to the wake-up receiver station during the RAW, wherein the wireless transmission of the wake-up packet causes the wake-up receiver station to transition from being in the normal sleep mode to being in an active mode, wherein when the wake-up receiver station is in the active mode the main radio of the wake-up receiver station is turned on.

Assignees

• Newracom Inc

Inventors

• Yu Heejung
• Kim Duk Bai

Classifications

• H04W52/0229

  where the received signal is a wanted signal · CPC title

• Y02D30/70

  in wireless communication networks · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04W52/0216 Primary

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title