Multi-Beam Transmission Power Control for RF Exposure Compliance
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Solution Overview
Problem
In multi-beam transmission, the total emission of multiple beams may exceed the power density standard despite individual beams satisfying the standard, posing a safety risk to users due to excessive RF exposure.
Innovation Solution
An electronic device identifies beams with excessive signal strength and applies power backoff to beams within the same antenna module, while switching to available beams without power backoff to maintain compliance with power density standards and ensure user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple beams are transmitted simultaneously to improve data transmission performance, then the data transmission rate is improved, but the total power emission exceeds the power density standard causing safety risks
Solution Approach 1:
The patent applies dynamic beam selection and power adjustment mechanisms. The system continuously monitors beam availability and dynamically switches between beam pairs, adjusting transmission power in real-time to maintain compliance with power density standards while maximizing data transmission performance. This is evident in the beam management procedures that adaptively select beams based on current channel conditions and safety constraints.
Solution Approach 2:
The patent changes transmission power parameters dynamically. When the second beam is unavailable, the system applies power backoff to the first beam; when the third beam becomes available, it switches to the first and third beam pair without power backoff. This parameter adjustment ensures that total power emission remains within safe limits while maintaining optimal data transmission when possible.
2Object-affected harmful factors
If power backoff is applied to control transmission power and meet safety standards, then power density compliance is improved, but data transmission performance deteriorates
Solution Approach 1:
The system dynamically switches between different beam configurations based on availability. When the third beam is available, it uses the first and third beam pair without power backoff, maintaining full transmission performance. When the third beam is unavailable, it temporarily uses power backoff with the first and second beam pair, ensuring safety compliance while maintaining connectivity.
Solution Approach 2:
The patent implements feedback mechanisms where the system monitors beam availability and continuously adjusts its transmission strategy. Based on feedback about which beams are available, the system makes intelligent decisions about whether to apply power backoff or switch to alternative beam pairs, optimizing the balance between safety compliance and transmission performance.
3Object-affected harmful factors
If the electronic device switches between different beam pairs based on availability, then power density compliance is maintained, but system complexity increases
Solution Approach 1:
The patent segments the beam management into distinct, manageable procedures. It identifies specific beam pairs (first-second and first-third) and creates separate handling logic for each configuration. This segmentation simplifies the overall complexity by breaking down the beam management into discrete, well-defined states and transitions between them.
Solution Approach 2:
The system manages complexity by focusing on changing a limited set of key parameters: beam pair selection and power backoff application. Rather than managing all possible beam combinations, it maintains a simplified state space with two main configurations, reducing the computational burden while ensuring compliance.
Data Source
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AI summary
A disclosed mobile electronic device may be configured to: identify multiple beams including a first beam and a second beam for communication with at least one base station; when the first beam and the second beam correspond to the same first direction, identify a third beam which corresponds to a direction differing from the first direction and has a strength of a signal received from the at least one base station, the strength being equal to or greater than a designated value; when the identification of the third beam fails, apply, to the first beam and the second beam, a power back-off for multiple beams corresponding to the same direction, so as to perform communication with the at least one base station; and when the third beam is identified, change the second beam to the third beam and perform communication with the at least one base station without applying the power back-off for multiple beams corresponding to the same direction and by using the first beam and the third beam. Various other embodiments identified through the specification are also possible.