Wake-Up Radio System for Low-Power Wireless Communication
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Solution Overview
Problem
Small computing devices with limited battery capacity, such as wearable devices and sensors, face challenges in minimizing energy consumption for wireless communication technologies like Wi-Fi and Bluetooth, as continuous data exchange requires constant power usage, which can be critical for devices with constrained power sources.
Innovation Solution
Implementing a Wake-Up Radio (WUR) system that uses a wake-up receiver to power on the primary connectivity radio only when necessary, utilizing a low-power wake-up receiver scheme to receive wake-up packets and switch to a low-power mode during idle periods, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous data exchange using wireless communication technologies is implemented, then data communication capability is improved, but power consumption increases
Solution Approach 1:
The radio system is divided into two separate components: a low-power wake-up receiver that continuously monitors for wake-up packets, and a primary connectivity radio that remains in sleep mode until activated. This segmentation allows the high-power radio to be turned off during idle periods while maintaining the ability to receive communications, thus reducing overall power consumption while preserving data communication capability.
Solution Approach 2:
The primary connectivity radio operates in periodic cycles, switching between sleep mode and active communication mode based on the reception of wake-up packets. The wake-up receiver operates continuously at low power to detect incoming communication requests, triggering periodic activation of the primary radio only when necessary, thereby reducing average power consumption while maintaining communication availability.
2Use of energy by moving object
If the primary connectivity radio is kept in sleep mode to reduce power consumption, then power consumption is reduced, but response time increases
Solution Approach 1:
A wake-up receiver acts as an intermediary component that continuously monitors the wireless channel for incoming packets. When a wake-up packet is detected, it immediately activates the primary connectivity radio. This intermediary mechanism eliminates the need for the primary radio to remain in deep sleep mode, as the wake-up receiver ensures rapid detection and activation, thus reducing response time while maintaining low power consumption during idle periods.
Solution Approach 2:
The wake-up receiver performs preliminary monitoring and detection of incoming communication requests before the primary connectivity radio needs to be activated. By continuously scanning for wake-up packets in advance, the system prepares for potential communication events, enabling the primary radio to switch to active mode quickly when needed, thereby reducing the effective response time while keeping the primary radio in low-power state during idle periods.
Data Source
AI summary
For example, an apparatus configured to cause a first Wake-Up Radio (WUR) wireless communication station (STA) to exchange a request frame and a response frame with a second WUR STA to set up a plurality of WUR parameters of a WUR mode at which the first WUR STA is to transmit one or more WUR wake-up frames configured for reception by a Wake-Up Receiver (WURx) of the second WUR STA, wherein the request frame is from the second WUR STA to the first WUR STA, and the response frame is from the first WUR STA to the second WUR STA in response to the request frame; to transmit an unsolicited update frame to the second WUR STA to update one or more WUR parameters of the plurality of WUR parameters; and to receive an Acknowledgement (Ack) frame from the second WUR STA to acknowledge the unsolicited update frame.