Beam-Level Power Thresholds for MPE Compliance
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Solution Overview
Problem
Current wireless communication systems face challenges in adhering to maximum permissible exposure (MPE) limits for radio frequency (RF) radiation, particularly in millimeter wave (mmW) systems, where beam steering concentrates radiation, potentially harming humans. Static power reduction to comply with MPE limits reduces effective range and performance.
Innovation Solution
A method for user equipment (UE) and network nodes to determine a Power Management Maximum Power Reduction (P-MPR) value for antenna panels or beams, calculating an output power threshold based on this value to ensure compliance with MPE limits while maintaining performance, by configuring specific power settings for each antenna panel or beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If beam steering is used to achieve higher EIRP in mmW systems, then transmission power and effective range are improved, but RF radiation exposure to humans increases causing harmful effects
Solution Approach 1:
The patent segments the total transmission power into beam-specific power levels. Each beam is assigned an individual power configuration based on its direction and potential human exposure risk. This allows the system to maintain high power for beams directed away from humans while reducing power for beams that may expose humans, thereby resolving the contradiction between achieving high EIRP and preventing RF radiation harm.
Solution Approach 2:
The patent implements dynamic power adjustment where transmission power is not static but adapts based on beam direction, human proximity detection, and real-time conditions. The network node continuously monitors and adjusts power levels for different beams, enabling the system to maximize EIRP when safe and reduce power when human exposure risk is detected, thus balancing transmission performance with safety.
2Object-affected harmful factors
If static power reduction is applied to comply with MPE limits, then RF radiation exposure is reduced, but effective range and system performance deteriorate
Solution Approach 1:
The patent applies local quality by implementing spatially differentiated power control where different power levels are assigned to different spatial directions and beams. Instead of uniformly reducing power across all transmissions, the system maintains high power in directions away from humans while applying power reduction only in directions where human exposure is detected. This localized approach preserves effective range and performance in safe directions while ensuring compliance in exposed directions.
Solution Approach 2:
The patent changes the power parameter dynamically based on multiple factors including beam direction, human proximity, frequency band, and MPE limits. By adjusting the power parameter conditionally rather than statically, the system can maintain high power settings (and thus effective range) when conditions permit, while only reducing power when necessary for compliance, thereby minimizing the impact on system performance.
3Speed
If beam steering concentrates radiation in specific directions, then transmission efficiency and range are improved, but the concentration of RF radiation increases potential harm to humans in those directions
Solution Approach 1:
The patent implements feedback mechanisms where the network node monitors human proximity detection results and uses this feedback to adjust beam power configurations in real-time. When human proximity is detected in a particular direction, the system receives feedback and automatically reduces power for beams in that direction. This closed-loop control allows the system to maintain high transmission efficiency when safe while promptly reducing radiation concentration when humans are detected, thus resolving the contradiction between efficiency and safety.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a user equipment (UE) or a component thereof. The apparatus may include a processing system configured to: determine a Power Management Maximum Power Reduction (P-MPR) value associated with an identifier (ID) of at least one of an antenna panel or a beam, and calculate an output power threshold associated with the ID of the at least one of the antenna panel or the beam based on the P-MPR value. The apparatus may further include a first interface configured to output data for transmission to a network node, the transmission being based on the output power threshold.