Wearable SAR Power Control Using Multi-Sensor State Detection
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Solution Overview
Problem
Wearable devices face challenges in managing specific absorption rate (SAR) and power density (PD) effectively due to varying use cases and limited battery capacity, leading to potential excess power reduction, latency, or performance issues.
Innovation Solution
Implementing a system that uses multiple sensors to determine the device's state, such as being on-body or off-body, and adjusts wireless communication interface operations accordingly to meet SAR/PD criteria while optimizing performance and minimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication interface operates at high power to maintain performance, then transmission quality is improved, but specific absorption rate (SAR) and power density (PD) exceed regulatory limits
Solution Approach 1:
The system dynamically adjusts transmission power based on real-time device state detection. Multiple sensors continuously monitor whether the wearable device is in contact with the body, and the wireless communication interface adapts its power level accordingly - operating at higher power when off-body and reducing power when on-body to maintain SAR compliance while preserving transmission quality when safe to do so.
Solution Approach 2:
The system changes the transmission power parameter based on detected device state. When sensors detect that the device is off-body or not in contact with the user, the system increases transmission power to maintain optimal communication performance. When on-body contact is detected, the system reduces transmission power to stay within SAR and PD regulatory limits.
2Object-affected harmful factors
If transmission power is reduced to comply with SAR/PD limits, then harmful factors are reduced, but performance and productivity deteriorate
Solution Approach 1:
The system implements dynamic power adjustment rather than static reduction. Transmission power is continuously adapted based on real-time sensor feedback about device state. This allows the system to maintain high performance when off-body while reducing power only when on-body contact is detected, thus preserving overall productivity without unnecessary performance degradation.
Solution Approach 2:
The system uses sensor data as feedback to continuously monitor device state and adjust transmission power accordingly. The sensors provide real-time information about whether the device is on or off the body, and this feedback loop enables the wireless communication interface to optimize its power level dynamically, maintaining performance when conditions allow while ensuring SAR/PD compliance when necessary.
3Measurement precision
If multiple sensors are used to accurately determine device state, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system segments the device state detection function across multiple specialized sensors, each responsible for detecting specific aspects of device state (e.g., proximity to body, motion state, orientation). This segmentation allows each sensor to be optimized for its specific detection task, improving overall measurement precision while distributing the complexity across modular components rather than requiring a single complex detection system.
Solution Approach 2:
The system uses multi-functional sensors that can detect multiple aspects of device state simultaneously. For example, inertial measurement units can detect both motion and orientation, and proximity sensors can detect both on-body and off-body states. This multi-functionality reduces the total number of sensors needed while maintaining high measurement precision, thereby managing device complexity more effectively.
Data Source
AI summary
Disclosed herein are related to a device. The device can include a wireless communication interface and one or more processors. The wireless communication interface can transmit data to a remote device. The one or more processors can determine a particular control state from a plurality of control states according to sensor data received from a plurality of sensors. The control states can be for meeting at least one of a specific absorption rate (SAR) or power density (PD) for operation of the wireless communication interface. The one or more processors can control operation of the at least one wireless communication interface according to the particular control state.