Mobile Terminal Power Control via Proximity Sensor
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Solution Overview
Problem
Mobile terminals face challenges in optimizing antenna performance to meet varying Specific Absorption Rate (SAR) standards across different regions, leading to suboptimal free space transmission and increased development and maintenance costs due to the need to lower antenna performance for stringent SAR standards.
Innovation Solution
A device and method that use a sensor to measure the distance between the mobile terminal and the user, controlling transmission power through a power control table to maximize antenna performance while satisfying human head SAR standards, thereby reducing Total Radiated Power (TRP) and maintaining high antenna efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If antenna performance is optimized for free space transmission, then transmission efficiency is improved, but SAR standard compliance deteriorates when terminal is close to user
Solution Approach 1:
The patent implements dynamic transmission power adjustment based on detected user proximity. The controller modifies transmission power in real-time according to the distance between terminal and user, allowing the antenna to operate at high efficiency when user is absent while automatically reducing power to comply with SAR standards when user is detected nearby.
Solution Approach 2:
The patent changes the transmission power parameter dynamically based on user proximity detection. By adjusting this key parameter according to detected distance, the system achieves both high transmission efficiency in free space and SAR compliance when user is present, resolving the contradiction between these two requirements.
2Object-affected harmful factors
If transmission power is reduced to satisfy stringent SAR standards, then SAR compliance is improved, but antenna performance in free space deteriorates
Solution Approach 1:
The system dynamically adjusts transmission power based on real-time proximity detection rather than using fixed reduced power settings. This allows the antenna to maintain optimal performance in free space while automatically adapting to SAR compliance requirements when user proximity is detected.
Solution Approach 2:
The terminal autonomously monitors user proximity and self-adjusts transmission power without external intervention. The controller detects proximity conditions and automatically modifies power output, enabling the system to serve both performance optimization and SAR compliance needs without manual configuration.
3Object-affected harmful factors
If different antennas are used for different SAR standards, then SAR compliance is improved, but device complexity and development costs increase
Solution Approach 1:
The patent implements a universal antenna system that can operate across different SAR standards through dynamic power adjustment. A single antenna design serves multiple regions with different SAR requirements by controlling transmission power based on user proximity detection, eliminating the need for region-specific antenna variants.
Solution Approach 2:
Instead of changing physical antenna characteristics for different regions, the system changes operational parameters (transmission power) based on detected user proximity. This parameter-based approach allows one antenna design to comply with various SAR standards, reducing device complexity and development costs.
4Object-affected harmful factors
If transmission power is dynamically adjusted based on user proximity, then SAR compliance is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical or hardware-based power control mechanisms with sensor-based detection and software-controlled power adjustment. The proximity sensor and controller work together to automatically adjust power, substituting simpler electronic control for more complex mechanical systems.
Solution Approach 2:
The system performs self-monitoring of user proximity and self-adjustment of transmission power through integrated sensor and controller. This autonomous operation reduces the need for external control mechanisms and simplifies the overall power control architecture.
Data Source
AI summary
A device and a method for controlling a transmission power in a mobile terminal are provided. The device includes an antenna set in an optimized state, a memory including a power control table that includes transmission power control data for satisfying a Specific Absorption Rate (SAR) standard in a state where efficiency of the antenna is optimized, a sensor for detecting a distance between the mobile terminal and a user, a controller for receiving distance data from the sensor and for outputting transmission power control data corresponding to the distance data by referring to the power control table, and a power amplifier connected between a transmitter and the antenna for controlling transmission power of a signal according to the transmission power control data and for outputting the signal to the antenna.