Mobile Device Transmit Power Adjustment via Motion and Proximity Sensors
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Solution Overview
Problem
Mobile devices face challenges in maintaining optimal voice call quality, as existing systems struggle to accurately determine whether the device is on a user's body or a stationary object, leading to inappropriate adjustments in transmission power levels.
Innovation Solution
The implementation of a system that uses motion sensors and proximity sensors to differentiate between being on a user's body and a stationary object by analyzing variance in motion signals and proximity data, allowing for dynamic adjustment of transmission power levels during voice calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile device transmits at high power levels to improve voice call quality, then the voice call quality is improved, but the device may violate government regulations when worn on or near the user's body
Solution Approach 1:
The system dynamically adjusts transmission power levels based on real-time detection of device location using motion sensors and proximity sensors. The transmit power is adjusted from high power levels (when device is on stationary object) to low power levels (when device is on user's body), allowing the system to optimize voice call quality while complying with government regulations at different moments
Solution Approach 2:
The system uses motion sensors and proximity sensors to continuously monitor device location and provides feedback to the transmission power control mechanism. This feedback loop enables the system to automatically determine whether the device is on a stationary object or on the user's body and adjust power levels accordingly, resolving the contradiction between maintaining high power for quality and reducing power for compliance
2Object-affected harmful factors
If the mobile device reduces transmit power to comply with regulations when on user's body, then regulation compliance is improved, but voice call quality deteriorates
Solution Approach 1:
The transmission power is dynamically adjusted based on detected device location. When the device is detected to be on a stationary object (not on user's body), the system restores high transmit power levels, thereby maintaining voice call quality without compromising regulation compliance when the device is actually on the user's body
3Measurement precision
If the system uses motion sensors and proximity sensors to accurately determine device location, then location determination accuracy is improved, but device complexity increases
Solution Approach 1:
The system combines data from motion sensors and proximity sensors to determine device location. By merging the capabilities of these existing sensors already present in modern smartphones, the system achieves accurate location determination without adding significant complexity, as both sensor types are standard components in contemporary mobile devices
Data Source
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AI summary
In some implementations, a mobile device can analyze motion sensor data and proximity sensor data during a voice call to determine whether the mobile device is on a stationary object or worn on a user's body (e.g., in the lap or pocket of a user of the mobile device). The mobile device can adjust the transmit power level of the telephony transceiver during the voice call based on the determination.