Moving Cell Layers for High Frequency Access Networks
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Solution Overview
Problem
Very high frequency radio access networks face challenges in maintaining service coverage and reducing handover occurrences due to the unique propagation characteristics of high-frequency signals, which lead to performance degradation and inefficient frequency reuse.
Innovation Solution
The method involves configuring and operating cells using multiple antenna assemblies arranged around moving paths, with each assembly functioning as a distributed unit and employing selective ON/OFF control and phase/weight control to form and move cells in a hierarchical manner, ensuring continuous coverage and reducing handover frequencies by optimizing beam coverage and frequency allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If beamforming scheme is used to reduce free space loss, then transmission capacity is improved, but blocking occurs due to strong straightness of high-frequency signals
Solution Approach 1:
The patent divides the coverage area into multiple layers with different cell movement speeds. Fast-moving cells serve high-speed vehicles, while slow-moving cells serve low-speed vehicles and provide coverage in blocking scenarios. This segmentation allows the system to maintain transmission capacity through beamforming while ensuring service coverage through multiple cell layers that can adapt to different propagation conditions.
Solution Approach 2:
The patent implements dynamic cell movement where cells move at different speeds configured for different layers. The cell movement speed is adapted based on vehicle speed and propagation conditions. This dynamic adjustment allows the system to maintain optimal coverage and reduce handover occurrences while preserving the benefits of beamforming for transmission capacity.
2Reliability
If more beams are used simultaneously to ensure service coverage, then coverage is improved, but spatial interference increases and device complexity increases
Solution Approach 1:
The patent segments the beam resources across multiple layers, where each layer uses a subset of beams configured for its specific movement speed and coverage requirements. This segmentation allows comprehensive coverage through multiple layers without requiring all beams to operate simultaneously at full power, thereby reducing spatial interference and managing device complexity.
Solution Approach 2:
Different layers are configured with different beam parameters and movement speeds tailored to their specific functions. Fast-moving layers use beams optimized for high-speed tracking, while slow-moving layers use beams optimized for coverage and handover reduction. This local optimization allows effective coverage without uniformly increasing complexity across all beams.
3Reliability
If cells are moved at different speeds for different layers, then handover occurrences are reduced, but system complexity increases
Solution Approach 1:
The patent segments the cell movement control into multiple layers, each with predetermined movement speeds matched to vehicle speed categories. This segmentation simplifies management by assigning cells to specific layers based on their movement characteristics, reducing the complexity of real-time decision-making while maintaining handover stability through appropriate speed matching.
Solution Approach 2:
The system pre-configures cell movement speeds for different layers based on expected vehicle speeds and propagation conditions. This preliminary configuration reduces the need for complex real-time adjustments, as cells are already optimized for their intended operating conditions, thereby reducing handover occurrences without requiring complex runtime management.
4Power
If frequency allocation is optimized for very high frequency band, then transmission capacity is improved, but propagation characteristics cause performance degradation
Solution Approach 1:
The patent implements dynamic adaptation to propagation characteristics by configuring cell movement speeds and beam parameters based on the specific propagation conditions of different layers. This dynamic configuration allows the system to maintain high transmission capacity through optimized frequency allocation while compensating for propagation degradation through adaptive cell movement and beamforming parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach prevents performance degradation by minimizing handover occurrences, increases frequency reuse, and maintains or improves data rates through carrier aggregation, especially in scenarios with high vehicle concentrations.
Implementation Method 1
As the frequency increases, a beamforming scheme may be used to reduce a free space loss proportional to a square of the frequency
Data Source
AI summary
A method for operating cells, performed by a central unit (CU) using at least one antenna assembly arranged around a moving path of moving objects, may comprise forming a cell for each of at least two layers by using the at least one antenna assembly; and moving the cell at a speed configured for a layer corresponding to the cell, wherein the cell is connected to a moving object having a speed corresponding to the speed configured for the layer corresponding to the cell.