WiFi Tethering Wake Scheduling for Low-Power AR/VR Headsets
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Solution Overview
Problem
Augmented reality (AR)/virtual reality (VR) head-mounted displays (HMDs) face challenges in reducing power consumption during data communication with external devices, leading to limited battery life and size constraints due to high power usage in wireless communication methods like WiFi, especially when used for extended periods or in applications like military activities.
Innovation Solution
Implementing a low-power communication method that divides data communication into active and sleep periods based on the frame rate of content, using a Target Wake Time (TWT) mode in WiFi wireless tethering, where the wireless communication circuit operates in an active state only during designated time slots and enters a sleep state to conserve power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless communication circuit operates continuously for high-throughput data transmission, then data communication performance is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by dividing communication operation into alternating active and sleep periods. The wireless communication circuit operates in active state during designated time slots to transmit/receive data, then enters sleep state to conserve power. This periodic switching resolves the contradiction by ensuring high throughput during active periods while reducing overall power consumption through sleep periods.
Solution Approach 2:
The patent implements dynamics by making the communication circuit's operational state changeable rather than fixed. The system dynamically transitions between active and sleep states based on communication requirements. This dynamic state switching allows the system to optimize between throughput (active state) and power consumption (sleep state) depending on real-time needs.
2Use of energy by moving object
If wireless communication circuit enters sleep state frequently to reduce power consumption, then power consumption is reduced, but data communication efficiency decreases
Solution Approach 1:
The patent applies preliminary action by establishing communication parameters and agreements (such as TWT parameters) before actual data transmission begins. This pre-configuration allows the system to efficiently switch between active and sleep states without negotiation overhead during communication, maintaining high efficiency even with frequent state transitions.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining communication channel readiness during sleep state through periodic wake-up schedules. The system remains capable of immediate data transmission during active periods without full re-initialization, ensuring continuous effective communication capability while allowing power savings during sleep intervals.
3Reliability
If active time period is extended to maintain continuous communication, then communication reliability is improved, but battery life decreases
Solution Approach 1:
The patent resolves this contradiction through periodic action with carefully designed active and sleep period durations. The active time period is extended sufficiently to complete data transmission tasks reliably, while sleep periods are inserted to conserve battery power. This periodic structure ensures communication reliability during active phases while extending overall battery life through power-saving sleep phases.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the duration of active and sleep periods based on communication requirements and battery status. When communication reliability is critical, active periods are extended; when battery conservation is priority, sleep periods are lengthened. This flexible parameter adjustment resolves the contradiction between reliability and battery life.
Data Source
AI summary
In accordance with an aspect of the disclosure, an electronic device comprises a wireless communication circuit; and at least one processor operatively connected to the wireless communication circuit, wherein the at least one processor is configured to: establish a communication channel with an external electronic device by using the wireless communication circuit; determine a duration of a data communication time period based on a frame rate of content, wherein the data communication time period comprises an active time period and a sleep time period; control the wireless communication circuit to enter an active state during the active time period; communicate data with the external electronic device through the communication channel during the active time period; and control the wireless communication circuit to enter a sleep state in a sleep time period.