Radio Node Channel-Wise EIRP Control for Beamforming Limits
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing effective isotropically radiated power (EIRP) to comply with regulatory safety limits while maintaining efficient cell coverage and throughput, especially in dense urban environments with increased beamforming gains.
Innovation Solution
Adaptive EIRP control methods are implemented in radio network nodes to dynamically adjust power levels on different physical channels based on transmission gains, considering MIMO layers and beamforming techniques, allowing independent EIRP management for each channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming gain is increased to enhance cell coverage and throughput, then wireless network performance is improved, but EIRP exceeds regulatory safety limits
Solution Approach 1:
The patent segments the downlink signals into different physical channels (PDSCH, PDCCH, PBCH, etc.) and applies independent EIRP control to each channel. This allows selective power reduction only on channels that would cause EIRP violations, while maintaining full power on channels that do not contribute to the violation, thereby preserving throughput while complying with regulations.
Solution Approach 2:
The patent applies different power adjustment strategies to different physical channels based on their specific characteristics and contributions to EIRP. Each channel receives localized quality control - some channels have their power reduced while others maintain original power levels, optimizing the balance between regulatory compliance and performance maintenance.
2Object-affected harmful factors
If power is reduced across all channels to comply with EIRP limits, then regulatory compliance is achieved, but cell coverage and throughput deteriorate
Solution Approach 1:
Instead of uniformly reducing power across all channels, the patent segments the downlink signals and identifies specific physical channels contributing to EIRP violations. Only those specific channels have their power reduced, while other channels maintain full power, thereby achieving compliance with minimal impact on overall throughput.
Solution Approach 2:
The patent applies partial power reduction - not all channels are reduced, but only the necessary portion (specific physical channels) to achieve EIRP compliance. This partial action is sufficient to meet regulatory requirements while avoiding excessive power reduction that would unnecessarily degrade performance.
3Object-affected harmful factors
If uniform power reduction is applied to all physical channels, then EIRP limits are met, but unnecessary power reduction occurs on channels not contributing to violations
Solution Approach 1:
The patent segments downlink signals into distinct physical channels and evaluates each channel's contribution to EIRP. This segmentation enables identification of specific channels that cause violations versus those that do not, allowing power reduction to be applied only where necessary and avoiding unnecessary energy loss on compliant channels.
Solution Approach 2:
The patent dynamically changes the power parameter for specific physical channels based on real-time EIRP violation detection. When violations are detected, power is adjusted for affected channels; when no violations occur, original power parameters are maintained, optimizing energy efficiency while ensuring compliance.
Data Source
AI summary
A method of operating a radio network node in a wireless communication system includes adaptively limiting effective isotropically radiated power, EIRP, of downlink signals transmitted by the radio network node on different physical channels. Radio network nodes that adaptively limit EIRP of downlink signals transmitted by the radio network node on different physical channels are also described.