Coordinating Controller for Multi-Transmitter EIRP Compliance
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Solution Overview
Problem
The increasing use of advanced antenna systems in radio equipment leads to higher directivity and concentrated radiated power, challenging RF EMF exposure regulations by potentially exceeding safe limits, necessitating efficient control of average Equivalent Isotropic Radiated Power (EIRP) to maintain compliance with RF EMF exposure limitations.
Innovation Solution
A coordinating controller system that obtains power control feedback information from inner controllers of multiple radio power sources, determines coordinating control information through an inner control loop, and adjusts the total average transmission power of each source to ensure compliance with RF EMF exposure regulations by selectively controlling the average EIRP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If advanced antenna systems with large number of antenna elements are used to achieve high directivity, then beamforming gain is increased, but the radiated power is concentrated in directional beams causing EIRP to increase and potentially exceed RF EMF exposure limits
Solution Approach 1:
The patent implements dynamic power control by continuously adjusting the transmit power of individual antenna elements based on real-time feedback about current EIRP levels and RF EMF exposure conditions. This allows the system to maintain high beamforming gain when needed while dynamically reducing power concentration to stay within regulatory limits, resolving the contradiction between achieving high directivity and preventing harmful radiation exposure.
Solution Approach 2:
The system changes the power parameter of individual antenna elements in response to feedback signals. By modifying the transmit power levels of specific elements rather than uniformly reducing all power, the system maintains beamforming effectiveness while controlling overall EIRP to comply with RF EMF exposure regulations, thus resolving the contradiction between high gain and safe exposure levels.
2Reliability
If multiple radio power sources share the same AAS or are co-sited and aligned, then combined EIRP control is required to maintain RF EMF compliance, but coordinating control across multiple sources increases system complexity
Solution Approach 1:
The patent employs a feedback mechanism where each radio power source reports its transmit power status and EIRP contribution to a coordinating controller. The controller processes this feedback and generates coordinated power adjustment commands for all sources. This feedback loop enables automatic compliance with RF EMF limits while distributing the control complexity across multiple independent but coordinated units, resolving the contradiction between ensuring compliance and managing system complexity.
Solution Approach 2:
The system divides the overall power control function into separate segments: individual power sources maintain their own inner control loops for basic power regulation, while a coordinating controller handles the higher-level EIRP coordination. This segmentation allows each component to remain relatively simple while achieving complex coordinated control, resolving the contradiction between compliance reliability and system complexity.
3Reliability
If time-averaged total transmit power is controlled to maintain RF EMF compliance boundary, then exclusion zones are maintained, but momentary power density cannot be optimized for communication performance
Solution Approach 1:
The system implements periodic power adjustment cycles where transmit power is dynamically modified over time intervals. During periods when RF EMF exposure margins allow, power is increased to optimize communication performance. When approaching regulatory limits, power is reduced to maintain compliance. This periodic modulation resolves the contradiction by allowing both momentary performance optimization and sustained compliance through time-averaged control.
Solution Approach 2:
The patent employs dynamic power control that continuously adapts transmit power levels based on real-time conditions including queue status, channel conditions, and RF EMF exposure margins. This allows the system to maximize momentary power density for communication performance when compliant, while ensuring time-averaged compliance is maintained, thus resolving the contradiction between performance optimization and regulatory compliance.
Data Source
AI summary
There is provided mechanisms for average EIRP control of at least two radio power sources. A method is performed by a coordinating controller of a site. The site comprises the at least two radio power sources. The method comprises obtaining, from a respective inner controller of each of the at least two radio power sources, power control feedback information. The method comprises determining, according to an inner control loop for each of the at least two radio power sources, coordinating control information from the power control feedback information. The method comprises performing individual average power control of each of the at least two radio power sources by providing, to each respective inner controller, the coordinating control information, whereby total average transmission power of each of the at least two radio power sources is selectively adjusted based on the inner control loop.