Device State Power Control for RF Exposure in Sub-6 GHz and mmWave
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Solution Overview
Problem
Existing wireless communication devices face challenges in complying with RF exposure limits during simultaneous radio transmissions across different frequency bands, as current methods do not accurately account for the combined RF exposure contributions from sub-6 GHz and millimeter wave transmissions.
Innovation Solution
Utilizing device state information (DSI) to adjust transmission power levels in real time, incorporating device state index (DSI) to accurately assess and manage RF exposure compliance in simultaneous radio transmission scenarios, particularly for sub-6 GHz and millimeter wave transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission power is increased to improve communication performance, then productivity is improved, but RF exposure limits are exceeded causing harmful effects
Solution Approach 1:
The patent implements dynamic adjustment of transmission power based on real-time device state information. The system continuously monitors device state (e.g., held vs. not held) and adjusts the maximum transmit power accordingly, transitioning from static power limits to dynamic power control that adapts to changing exposure conditions.
Solution Approach 2:
The patent changes the parameter of transmission power based on device state information. When the device is detected as being held (increased exposure risk), the system reduces the maximum transmit power parameter. When not held (lower exposure risk), the system allows higher transmit power, thus optimizing the power parameter according to exposure conditions.
2Object-affected harmful factors
If transmission power is limited to comply with RF exposure limits, then harmful effects are reduced, but communication performance and productivity deteriorate
Solution Approach 1:
The system dynamically adjusts power limits based on device state rather than applying a fixed conservative limit. This allows the system to maximize transmission power within safe boundaries by adapting to real-time conditions, thus improving productivity while maintaining safety.
Solution Approach 2:
The patent modifies the transmit power parameter according to device state information, changing the power level to match actual exposure conditions. This prevents unnecessary power reduction when exposure risk is low, thereby maintaining optimal communication performance while ensuring safety when needed.
3Manufacturing precision
If device state information is used to dynamically adjust transmission power, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The system uses self-service by leveraging existing device state information that is already available from the device's operation (e.g., sensor data about holding state). Rather than requiring complex external monitoring systems, the device uses its own operational data to make compliance decisions, reducing overall system complexity.
Solution Approach 2:
The patent employs multi-functionality by using device state information that serves dual purposes: it controls device operation and simultaneously determines RF exposure compliance. This existing data is repurposed for compliance assessment, avoiding the need for separate complex monitoring systems.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques and apparatus for radio frequency (RF) exposure compliance using device state information (e.g., a device state index (DSI)). Certain aspects may utilize the device information in simultaneous radio transmission scenarios, such as for simultaneous sub-6 GHz and millimeter wave (mmWave) radio transmission scenarios. In some transmission scenarios, the device state information may be applied in real time to account for a lower mmWave RF exposure contribution to the total RF exposure, thereby providing for potentially increased transmission power from the sub-6 GHz radio.