Wireless Signature Beacon Wakeup for IoT Power Saving
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Solution Overview
Problem
Wireless communication devices configured for machine-type communication face challenges in extending battery life due to unnecessary wake-ups from power saving mode, which can shorten battery life when not actively communicating.
Innovation Solution
Implementing a wireless signature beacon trigger system that allows devices to wake up only when specifically signaled, using a unique signature beacon associated with a group identifier and trigger type, transmitted via a DC subcarrier, and detected by a matched filter module to minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices wake up at scheduled intervals to check for communication, then communication readiness is maintained, but battery life is shortened due to unnecessary wake-ups
Solution Approach 1:
The patent implements periodic wake-up cycles where the device wakes at scheduled intervals to monitor for signature beacons, but only exits power saving mode when a matching beacon is detected. This maintains communication readiness through periodic checks while avoiding unnecessary full wake-ups, thereby extending battery life compared to continuous monitoring approaches.
Solution Approach 2:
The patent introduces signature beacons as intermediary signals that enable asynchronous communication initiation. Instead of the device continuously checking for communication requests, external devices can send targeted signature beacons that selectively wake up specific devices, reducing unnecessary wake-ups and power consumption while maintaining the ability to reach devices in power saving mode.
2Use of energy by moving object
If devices remain in power saving mode to extend battery life, then power consumption is reduced, but devices cannot be reached when communication is needed
Solution Approach 1:
Signature beacons serve as intermediary wake-up signals that allow external devices to reach devices in power saving mode without requiring continuous monitoring. The beacon contains unique identifiers that enable selective waking of specific devices, ensuring reachability when needed while maintaining low power consumption during idle periods.
Solution Approach 2:
The system performs preliminary registration of device identifiers and signature beacon patterns during setup phases. This preliminary action enables the network to efficiently route and deliver targeted wake-up beacons to specific devices later, ensuring that devices remain reachable without needing to maintain continuous communication channels.
3Use of energy by moving object
If devices use unique signature beacons for wake-up triggers, then power consumption is reduced by avoiding unnecessary wake-ups, but system complexity increases
Solution Approach 1:
The patent uses simplified signature beacon formats that can be implemented as lightweight signal patterns rather than complex data structures. Each device is assigned a unique signature that can be detected using simple correlation algorithms, reducing the computational complexity on both the transmitting and receiving sides while still enabling selective wake-up functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively extends battery life by ensuring devices only wake up when necessary, reducing unnecessary power usage and maintaining communication readiness without frequent scheduled intervals.
Implementation Method 1
A wakeup detector module may include a set of matched filters and a matched filter selector to select a particular matched filter. Each matched filter may be configured to detect a particular signature beacon.
Data Source
AI summary
A wireless communication device may include a baseband processing unit comprising a wakeup detector configured to receive a wireless signature beacon signal; determine that the received wireless signature beacon signal matches the selected wakeup signature beacon signal; and generate a wake up signal, in response to determining that the received wireless signature beacon signal matches the selected wakeup signature beacon signal. The wireless communication device may further include an application processing unit comprising a power manager configured to cause the wireless communication device to enter a power saving mode; receive the wake up signal from the wakeup detector; and perform a wakeup process, in response to receiving the wakeup signal wherein the wakeup process causes the wireless communication device to exit the power saving mode.