Dynamic Radiation Power Control for Wireless Devices
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Solution Overview
Problem
Current wireless communication devices face challenges in controlling radiation power levels to ensure compliance with Specific Absorption Rate (SAR) limits, which can affect user safety and device efficiency, as existing solutions often require adjusting the RF transmitter system, potentially detrimental to performance.
Innovation Solution
A radiation power level control scheme that dynamically adjusts transmission power based on usage patterns and SAR determinations, using a tracked power history to reduce power levels when thresholds are exceeded, implemented either locally on the device or through network infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the maximum power level is limited to comply with SAR thresholds, then user safety is improved, but device transmission efficiency deteriorates
Solution Approach 1:
The patent implements dynamic power adjustment by tracking cumulative radiation exposure over time and adapting the maximum power level accordingly. The system transitions from static power limiting to dynamic control, where the maximum power level varies based on the device's radiation history and current exposure state, thereby optimizing both safety compliance and transmission efficiency.
Solution Approach 2:
The system changes the power level parameter dynamically based on tracked radiation history. By monitoring cumulative exposure and adjusting the maximum power level parameter in response to exposure conditions, the system achieves adaptive control that balances SAR compliance with maintaining adequate transmission performance.
2Object-affected harmful factors
If the RF transmitter system is adjusted to meet SAR limits, then radiation compliance is improved, but system performance deteriorates
Solution Approach 1:
The system performs preliminary tracking of radiation exposure history before making power adjustment decisions. By maintaining a record of cumulative exposure in advance, the system can proactively adjust power levels to ensure SAR compliance while minimizing performance impact, rather than reactively reducing power after exceeding limits.
Solution Approach 2:
The patent implements a feedback mechanism where the tracked radiation history is continuously monitored and used to adjust the maximum power level. This closed-loop control ensures that power adjustments are based on actual exposure conditions, maintaining SAR compliance while optimizing system performance through informed decision-making.
3Device complexity
If a fixed time window is used for tracking power data, then implementation simplicity is improved, but accuracy of SAR determination deteriorates
Solution Approach 1:
The patent transitions from a static fixed time window approach to a dynamic tracking mechanism that adapts the effective tracking period based on device usage patterns and transmission activity. This dynamic approach maintains implementation feasibility while significantly improving SAR determination accuracy by considering the actual temporal distribution of power emissions.
Solution Approach 2:
The system preliminarily establishes a tracking framework that records power data with temporal context before SAR determination is needed. By maintaining this historical record in advance, the system enables accurate SAR calculations that account for the time-dependent nature of cumulative exposure, without adding complex real-time computation requirements.
Data Source
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AI summary
A radiation power level control scheme (200) for a wireless user equipment (UE) device (700). In one embodiment, a power data history (300) associated with the wireless UE device (700) is maintained, the power data history (300) comprising data tracked over a time window (e.g., a sliding time window) relative to one or more variables on a per transmission event basis. A component of the UE device (700) is configured to determine a time-average transmission power level. Another component is configured to compare the time-average transmission power level with a first time-averaged transmission power limit threshold, the first time-averaged transmission power limit threshold having a value that depends on a transmission power data history (300) for the UE device (700). A still further component is provided, operable responsive to the average transmission power level meeting or exceeding the first time-averaged transmission power limit threshold, that is configured to reduce a transmission power level of the UE device (700).