Radio Base Station Vertical Beamforming Codebook
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Solution Overview
Problem
Existing precoder codebooks in radio communications networks are not designed to efficiently and reliably utilize active antenna arrays, leading to inefficient data signal transmission and increased interference with neighboring cells.
Innovation Solution
A method and radio base station configuration that precodes data signals using a codebook with a factorized structure, transforming them to direct signals vertically and limiting transmission within a controlled range of elevation angles, utilizing active antenna arrays with sub-elements to achieve efficient and reliable beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing precoder codebooks are used for transmission, then data signal transmission is performed, but the utilization of active antenna arrays is inefficient and interference with neighboring cells increases
Solution Approach 1:
The precoder codebook is segmented into multiple subsets, each optimized for specific transmission scenarios and antenna configurations. This segmentation allows the system to select appropriate codebook subsets that maximize transmission efficiency while minimizing interference with neighboring cells by matching the codebook subset to the specific active antenna array configuration and channel conditions.
Solution Approach 2:
The invention extends traditional precoding from horizontal (azimuth) beamforming to include vertical (elevation) beamforming by utilizing the sub-elements of active antenna arrays. This dimensional extension enables three-dimensional beamforming capabilities, allowing signals to be directed more precisely in both azimuth and elevation, thereby improving transmission efficiency and reducing interference to neighboring cells through spatial separation.
2Reliability
If active antenna arrays with sub-elements are utilized, then beamforming capability is enhanced, but the complexity of precoder codebook design increases
Solution Approach 1:
The precoder codebook is divided into multiple subsets, where each subset is designed for specific active antenna array configurations and beamforming scenarios. This segmentation reduces the overall design complexity by breaking down the comprehensive codebook design into manageable subsets, each optimized for particular conditions while collectively providing robust beamforming capabilities across diverse scenarios.
Solution Approach 2:
The system dynamically selects appropriate precoder codebook subsets based on real-time channel conditions, antenna configurations, and transmission requirements. This dynamic adaptation allows the system to maintain reliable beamforming performance without requiring a single overly complex static codebook, as the appropriate codebook subset is chosen and applied based on current operational context.
3Object-generated harmful factors
If signals are directed vertically with controlled elevation angles, then interference is reduced, but the control of energy distribution becomes more complex
Solution Approach 1:
The system dynamically adjusts elevation angle constraints and energy distribution parameters based on system load, channel conditions, and interference requirements. This dynamic control enables the system to reduce interference with neighboring cells by appropriately limiting vertical signal direction while optimizing energy distribution, without requiring overly complex static control mechanisms.
Solution Approach 2:
The invention controls energy distribution by adjusting key parameters such as elevation angle ranges, beamforming weights, and precoder selections. By changing these parameters adaptively based on operational conditions, the system achieves effective interference reduction and energy optimization without requiring fundamentally complex control architectures.
Data Source
Figure 1
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AI summary
Embodiments herein relate to a method in a radio base station (12) for transmitting a data signal to a user equipment (10) in a radio communications network. The radio base station (12) is connected to an active antenna array of a number of active transmitting antennas and the radio base station (12) serves the user equipment (10) in the radio communications network. Each active transmitting antenna comprises sub elements. The radio base station (12) transforms a precoded data signal using a transformation, which transformation directs signals vertically. Furthermore, the radio base station (12) transmits the transformed data signal over at least one sub element to the user equipment (10). The transmitted data signal is enabled to be directed vertically, and the transformed data signal is limited to be transmitted in a direction within a range of elevation angles.