Remote Radio Head Traffic Demand Beamforming
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Solution Overview
Problem
Current Remote Radio Head (RRH) systems face challenges in adaptively adjusting coverage to match dynamic traffic patterns without relying on external devices or Base Band Unit (BBU) support, requiring architecturally inefficient duplication of radio interface bus decoder functionalities and precise timing synchronization.
Innovation Solution
A Remote Radio Head with multiple antennas that calculates traffic demand metrics using signals from each Radio Frequency chain and generates analog beams directed towards high-traffic areas, eliminating the need for external devices and precise BBU synchronization through integrated metric calculation and beamforming units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If 3D beamforming is applied to adaptively adjust coverage in both azimuth and elevation plane, then coverage adaptability is improved, but hardware complexity and signal processing requirements increase significantly
Solution Approach 1:
The patent segments the beamforming functionality into two independent parts: analog beamforming for azimuth adjustment and digital beamforming for elevation adjustment. This segmentation allows the system to achieve 3D coverage adaptation without requiring full 3D analog beamforming hardware, thereby reducing hardware complexity while maintaining coverage adaptability.
Solution Approach 2:
The patent transitions from traditional 2D beamforming (azimuth only) to 3D beamforming by adding the elevation dimension through digital signal processing. This dimensional extension is achieved without proportionally increasing hardware complexity by using existing RF chains for analog azimuth beamforming and adding digital processing capabilities for elevation control.
2Measurement precision
If full-digital beamforming architecture is used for traffic demand estimation, then estimation accuracy is improved, but coordination overhead between higher and lower layers increases significantly
Solution Approach 1:
The patent extracts the traffic demand estimation function from the BBU and relocates it to the RRH. By tapping the radio interface bus within the RRH, the system can estimate traffic demand locally without requiring complex coordination with the BBU, thereby maintaining estimation accuracy while reducing coordination overhead.
Solution Approach 2:
The RRH performs traffic demand estimation autonomously by utilizing its own internal resources (radio interface bus data). This self-service approach eliminates the need for external assistance from the BBU for estimation purposes, reducing inter-layer coordination requirements while maintaining accurate traffic awareness.
3Adaptability or versatility
If traffic demand estimation is performed by tapping radio interface bus, then BBU support is eliminated, but architectural efficiency deteriorates due to duplication of decoder functionalities
Solution Approach 1:
The patent makes the RRH multi-functional by enabling it to perform both its traditional RF functions and traffic demand estimation functions. By utilizing the existing radio interface bus for dual purposes (data transmission and traffic estimation), the system achieves BBU independence without requiring separate dedicated hardware for estimation, thereby maintaining architectural efficiency.
4Measurement precision
If precise timing and frame synchronization is implemented for traffic demand estimation, then estimation accuracy is improved, but synchronization requirements increase system complexity
Solution Approach 1:
The RRH performs self-synchronization by using its own internal timing references and the inherently synchronized data it receives on the radio interface bus. This self-service synchronization approach eliminates the need for external synchronization signals or complex inter-device timing coordination, thereby achieving accurate traffic demand estimation without increasing system synchronization complexity.
Data Source
AI summary
Provided a Remote Radio Head (RRH) with multiple antennas generating a plurality of analog beams in a wireless communication system serving at least one user terminal, including a metric calculator that calculates at least one metric representing a traffic demand as a function of spatial direction by using at least a signal of each Radio Frequency chain and a beam former that generates analog beams directed towards a spatial direction determined based on the calculated at least one metric.