Radio Base Station EIRP Control via Beam Width Adjustment
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Solution Overview
Problem
Advanced antenna systems (AAS) in radio base stations increase beamforming gain, leading to higher momentary Equivalent Isotropic Radiated Power (EIRP) and power density, which can exceed regulatory limits, necessitating efficient control of average EIRP to maintain compliance.
Innovation Solution
A back-off power control loop is implemented using a beam width control parameter to selectively reduce the average EIRP generated by the antenna array, ensuring compliance with RF EMF exposure regulations by varying the beam width and thereby the antenna gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming gain is increased to achieve high directivity, then coverage and capacity are improved, but momentary EIRP and power density increase exceeding regulatory limits
Solution Approach 1:
The patent applies dynamics by making the beam width control parameter adjustable and time-varying. The back-off power control loop dynamically modifies the beam width parameter in response to measured average EIRP levels, allowing the system to adapt beamforming characteristics in real-time. This enables the system to maintain high directivity when needed while reducing momentary power density peaks to comply with regulatory limits.
Solution Approach 2:
The patent implements parameter changes by modifying the beam width control parameter to control the EIRP characteristics. By changing the beam width parameter, the system alters the antenna gain distribution, thereby controlling the momentary EIRP and average EIRP levels. This parameter adjustment mechanism allows the system to maintain productivity while complying with power density regulations.
2Reliability
If maximum EIRP is used to maintain coverage, then service quality is maintained, but average EIRP exceeds regulatory thresholds requiring power back-off
Solution Approach 1:
The patent implements feedback through a back-off power control loop that continuously monitors the average EIRP and adjusts the beam width control parameter accordingly. The control loop uses feedback from power measurements to dynamically adjust beamforming parameters, ensuring that average EIRP remains within regulatory limits while maintaining service quality through adaptive beam width control.
Solution Approach 2:
The system uses dynamic adjustment of the beam width parameter to balance service quality and regulatory compliance. Rather than using fixed maximum EIRP, the system dynamically adapts beam width based on current conditions and average power levels, allowing service quality to be maintained through intelligent control rather than brute-force power transmission.
3Power
If beam width is reduced to increase directivity, then antenna gain increases, but beamforming gain causes EIRP concentration exceeding limits
Solution Approach 1:
The patent applies dynamics by making beam width adjustable rather than fixed. The system can dynamically widen or narrow beams based on operational requirements and regulatory constraints, allowing the antenna gain to be optimized without permanently concentrating EIRP to harmful levels. The back-off control loop ensures that even when directivity is increased, the average EIRP remains compliant.
Data Source
AI summary
Mechanisms for controlling average Equivalent Isotropic Radiated Power (EIRP) of a radio base station, in which a method is performed by a control device. The method comprises performing control of average EIRP of the radio base station according to a back-off power density control loop. In the back-off power density control loop, a beam width control parameter is used to vary the average EIRP generated by an antenna array of the radio base station, whereby the average EIRP is selectively reduced based on the beam width control parameter.