Radio Base Station Power Control Loop Scaling
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Solution Overview
Problem
Current mechanisms for controlling the average transmitted power of radio base stations with advanced antenna systems face challenges in maintaining RF EMF exposure compliance, particularly due to varying averaging times specified by different RF exposure standards, leading to complexity in tuning back-off power control mechanisms and high memory requirements for power sample storage.
Innovation Solution
A control device and method utilizing a back-off power control loop with scaled control parameters proportional to the inverse of the averaging time, enabling efficient control of total average transmission power and reducing capacity losses and improving stability, while maintaining uniform behavior across different averaging times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the averaging time T is increased to ensure RF EMF exposure compliance, then the stability of power control is improved, but the response time of the back-off power control loop deteriorates
Solution Approach 1:
The control parameters of the back-off power control loop are scaled proportionally to the inverse of the averaging time T, making the control loop dynamically adaptive to different averaging time requirements while maintaining stable behavior across varying conditions
Solution Approach 2:
The invention changes the parameters of the control loop by scaling them according to the averaging time T, allowing the system to adjust its response characteristics based on the required averaging period while maintaining consistent control performance
2Adaptability or versatility
If different averaging times are used to comply with various RF exposure standards, then the adaptability of the system is improved, but the complexity of tuning control parameters increases
Solution Approach 1:
The back-off power control loop is designed with universally scalable control parameters that work across different averaging times and RF exposure standards, eliminating the need for separate tuning procedures for each standard
Solution Approach 2:
By scaling control parameters proportionally to the inverse of the averaging time T, the system automatically adapts to different RF exposure standards without requiring complex re-tuning, as the parameter relationships remain consistent across different operating conditions
3Measurement precision
If longer averaging times are used for power computation, then the accuracy of average power measurement is improved, but the memory requirements for power sample storage increase
Solution Approach 1:
The control parameters are dynamically scaled with the averaging time T, allowing the system to compute average power over longer periods while maintaining efficient memory utilization through proportional parameter adjustment
Data Source
AI summary
There is provided mechanisms for controlling total average transmission power of a radio base station. A method is performed by a control device. The method comprises performing control of total average transmission power (Ptot)(t) of the radio base station according to a back-off power control loop. In the back-off power control loop, a setpoint value (Ptot)ref of the total average transmission power is compared with a value of the total average transmission power (Ptot)(t)—The value of the total average transmission power (Ptot)(t) is computed over an averaging time T. Control parameters of the back-off power control loop are scaled proportionally to the inverse of the averaging time T. The control parameters pertain to a response time of the back-off power control loop.