Beam Pattern Reshaping for EIRP Compliance
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Solution Overview
Problem
Current beamforming schemes in communication networks, especially in unlicensed frequency bands, face challenges in optimizing beam patterns due to EIRP constraints, leading to sub-optimal performance as they primarily scale existing beam patterns without reshaping them to maximize received signal energy without violating power limits.
Innovation Solution
A method and control node that redistribute transmission energy among individual beams based on radio propagation channel properties, truncating the energy of the highest energy beam to stay within a threshold and redistributing it among other beams, thereby reshaping the beam pattern to enhance coverage and spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamforming is used to focus transmission energy in specific directions, then coverage and throughput are improved, but EIRP constraints in unlicensed frequency bands limit the maximum transmit power density
Solution Approach 1:
The patent applies local quality by differentiating the treatment of individual beams within the beam pattern. Instead of uniform power distribution, the system identifies and selectively truncates only those beams that exceed the EIRP threshold, while allowing other beams to maintain or increase their power levels. This localized adjustment optimizes power utilization without unnecessarily limiting beams that comply with regulations.
Solution Approach 2:
The patent changes the power parameter of individual beams dynamically based on EIRP compliance requirements. By adjusting the transmit power of specific beams that exceed the threshold while maintaining or increasing power for compliant beams, the system adapts the beam pattern to satisfy regulatory constraints while maximizing overall throughput.
2Reliability
If transmission power is backed-off according to the strongest beam to ensure EIRP compliance, then regulatory constraints are satisfied, but the beam pattern does not optimize energy distribution across all beams
Solution Approach 1:
The patent applies local quality by selectively applying power truncation only to individual beams that exceed the EIRP threshold, rather than uniformly backing off all beams. This allows the system to maintain EIRP compliance for problematic beams while optimizing power distribution across compliant beams, thereby improving overall energy distribution efficiency.
Solution Approach 2:
The patent introduces dynamic adjustment of beam powers based on real-time EIRP compliance assessment. The system iteratively evaluates each beam's contribution to EIRP and dynamically adjusts power levels, redistributing available power to beams that can operate within constraints, thus optimizing energy distribution while ensuring regulatory compliance.
3Productivity
If beam pattern is determined without EIRP limit consideration, then optimal energy distribution is achieved, but the transmit power may violate EIRP constraints
Solution Approach 1:
The patent applies preliminary action by first determining the optimal beam pattern without EIRP constraints, then subsequently identifying and correcting violations through selective power truncation. This two-stage approach allows the system to achieve optimal energy distribution initially, then adjust only the necessary beams to comply with EIRP limits, minimizing the impact on overall optimization.
Solution Approach 2:
The patent converts the harmful effect of EIRP violations into a beneficial optimization process. By identifying which beams cause EIRP violations and selectively truncating only those, the system transforms the constraint into an opportunity to optimize power distribution across compliant beams, thereby achieving both regulatory compliance and improved energy distribution efficiency.
Data Source
AI summary
There is provided mechanisms for reshaping individual beams of a beam pattern. A method is performed by a control node. The method comprises determining the beam pattern by distributing available transmission energy in individual beams according to a weighted combination of the individual beams. Different weights are applied for at least two of the individual beams. The weighted combination of individual beams is based on radio propagation channel properties. The method comprises truncating transmission energy of the individual beam with highest transmission energy in the beam pattern to not be over a threshold. The method comprises redistributing the truncated transmission energy among the remaining individual beams in the beam pattern, thereby reshaping the individual beams of the beam pattern.