Dynamic Power Control for Multi-Protocol Communication SAR Compliance
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Solution Overview
Problem
Existing electronic devices face challenges in controlling transmission power to minimize electromagnetic radiation absorbed by the human body, as measured by Specific Absorption Rate (SAR), which can exceed safety thresholds, particularly when using multiple communication protocols and antennas.
Innovation Solution
A communication device and method that dynamically control the output power of multiple communication circuitries to ensure the sum of output power values across different communication protocols and time ranges does not exceed a preset threshold, using a combination of processors and communication protocols to manage SAR levels, including identifying and adjusting output power based on SAR distribution and average values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple communication circuitries operate simultaneously with high output power, then communication performance is improved, but SAR values exceed safety thresholds
Solution Approach 1:
The patent implements dynamic power control that continuously monitors and adjusts output power of communication circuitries in real-time based on accumulated SAR values, changing power levels from static to adaptive to maintain SAR compliance while preserving communication performance
Solution Approach 2:
The system changes the power parameter dynamically by adjusting output power levels of communication circuitries based on SAR accumulation, transforming fixed power operation into variable power operation that adapts to thermal and safety constraints
2Object-affected harmful factors
If output power is reduced to comply with SAR thresholds, then SAR safety is improved, but communication performance deteriorates
Solution Approach 1:
The patent employs periodic power adjustment cycles where communication circuitries operate at high power within safe SAR windows and reduce power when thresholds are approached, creating a rhythmic pattern of power delivery that maintains both safety and performance
Solution Approach 2:
The system allows temporary excessive power output within designated time ranges when SAR accumulation is low, then compensates with reduced power later, using partial power reduction rather than continuous full reduction to maintain overall communication effectiveness
3Device complexity
If power is distributed evenly across multiple communication protocols, then device complexity is simplified, but SAR control precision is reduced
Solution Approach 1:
The patent applies different power control strategies to different communication circuitries based on their individual SAR characteristics and operational patterns, treating each communication protocol with customized power management rather than uniform control
Data Source
AI summary
A communication device is provided. The communication device includes first communication circuitry configured to perform first wireless communication with a first external device based on a first communication protocol, second communication circuitry configured to perform second wireless communication with a second external device based on a second communication protocol, memory storing one or more computer programs, and one or more application processors communicatively connected to the first communication circuitry, the second communication circuitry and the memory, wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more application processors, causes the communication device to control the first communication circuitry and the second communication circuitry such that a sum of a first output power value output by the first communication circuitry during a predetermined time range and a second output power value output by the second communication circuitry during the predetermined time range does not exceed a preset total threshold.