WLAN Sensing Wake-Up Scheduling for Lower Power Consumption
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Solution Overview
Problem
WLAN sensing technologies cause additional power consumption beyond conventional data transmission, hindering the activation of devices that prioritize power saving, such as IoT devices and smartphones.
Innovation Solution
A method is proposed where a transmitting STA transmits wake-up time information and frames to a receiving STA, allowing devices to enter a power-saving mode while still performing sensing operations, reducing power consumption by optimizing power usage during WLAN sensing sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If WLAN sensing operations are performed continuously to ensure sensing functionality, then sensing capability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic wake-up intervals where the receiving STA alternates between sleep mode and active sensing mode. The transmitting STA sends wake-up frames at specific intervals to trigger the receiving STA to wake up and perform sensing operations, then return to sleep mode. This periodic activation maintains sensing capability while significantly reducing average power consumption compared to continuous operation.
2Use of energy by moving object
If devices enter power-saving mode to reduce power consumption, then power efficiency improves, but sensing operations cannot be performed
Solution Approach 1:
The transmitting STA performs preliminary actions by sending wake-up frames and sensing initiation frames before the receiving STA enters sleep mode. The receiving STA wakes up, performs necessary sensing operations, and returns to sleep mode. This preliminary activation ensures sensing operations can be completed before power-saving mode engages, maintaining sensing reliability while achieving power efficiency.
3Measurement precision
If the receiving STA continuously monitors signals to perform sensing, then sensing accuracy is maintained, but power consumption increases
Solution Approach 1:
The receiving STA monitors signals periodically rather than continuously. It wakes up at scheduled intervals triggered by wake-up frames from the transmitting STA, performs sensing measurements during these brief active periods, then enters sleep mode. This periodic monitoring maintains sensing accuracy for periodic applications while dramatically reducing power consumption compared to continuous monitoring.
4Speed
If wake-up frames are transmitted frequently to maintain sensing readiness, then sensing responsiveness improves, but power consumption increases
Solution Approach 1:
The wake-up frame transmission frequency is dynamically adjusted based on sensing requirements. For time-critical sensing applications, wake-up frames are transmitted more frequently to ensure rapid responsiveness. For less critical applications, the interval between wake-up frames is extended to reduce power consumption. This dynamic adjustment optimizes the balance between sensing responsiveness and power efficiency.
Data Source
AI summary
In a wireless local area network (WLAN) system, a transmitting STA may transmit wake-up time information related to a receiving STA to the receiving STA. The transmitting STA may transmit a sensing start frame to the receiving STA during a wake-up time. The transmitting STA may transmit a sensing frame to the receiving STA. The transmitting STA may transmit a feedback requesting frame for the sensing frame to the receiving STA. The transmitting STA may receive a feedback frame for the sensing frame from the receiving STA. The wake-up time information may include duration information for maintaining an awake state in which the receiving STA can monitor a signal received from the transmitting STA, and period information for transitioning to the awake state.