Wake-Up Receiver Channel Access Using Restricted Access Windows

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Solution Overview

Problem

Existing wireless communication systems face challenges in protecting low-power wake-up packets from interference by legacy frames, leading to inefficient power consumption and reduced network operation time in IoT devices.

Innovation Solution

A mechanism is introduced to allocate a restricted access window (RAW) specifically for wake-up receiver stations, allowing only these stations to transmit during this window, thereby protecting their transmissions and enabling a more efficient green-field WUP frame format and allowing for sleep mode stages to conserve power.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If wake-up receiver stations transmit in shared channels with legacy stations, then channel utilization is improved, but wake-up packets are interfered with by legacy frames

Engineering Contradiction:

Improvechannel utilizationVSAvoidwake-up packet transmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The channel access is segmented into different time periods: legacy stations access during non-RAW periods while wake-up receiver stations access during designated RAW periods. This temporal segmentation eliminates interference between the two types of stations while maintaining overall channel utilization.

Inventive Principle:

Principle #1Segmentation

2Reliability

If wake-up receiver stations remain active to monitor channels, then wake-up packet reception is improved, but power consumption increases

Engineering Contradiction:

Improvewake-up packet reception reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

Wake-up receiver stations periodically wake up during designated RAW periods to monitor for wake-up packets, then return to sleep mode. This periodic activation maintains reliable wake-up packet reception while minimizing power consumption compared to continuous monitoring.

Inventive Principle:

Principle #19Periodic action

3Adaptability or versatility

If legacy stations continue to use traditional transmission formats, then backward compatibility is maintained, but interference with wake-up packets occurs

Engineering Contradiction:

Improvebackward compatibilityVSAvoidinterference with wake-up packets

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

Wake-up receiver stations are extracted into a separate access mechanism with dedicated RAW periods. During these periods, legacy stations are excluded from transmitting, eliminating interference while allowing legacy stations to continue using traditional formats during their designated access periods.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12563491B2Channel access mechanism for low power wake-up receivers

Publication Date: 2026.02.24 NEWRACOM INC

AI summary

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.