Antenna Array Subdivision for Near-Field CSI and Blockage Handling
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Solution Overview
Problem
Existing antenna array configurations in 3GPP networks assume planar wave propagation, which is invalidated when devices are in close proximity, leading to reduced service quality due to invalidation of spatial bases and planar impingement assumptions.
Innovation Solution
Implementing antenna array subdivision and blocking configurations to account for near-field propagation and spatial non-stationarity, using advanced codebooks that consider curved wavefronts and potential blockages, enhancing CSI acquisition for improved network service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If antenna array configurations assume planar wave propagation, then device complexity is reduced and ease of operation is improved, but service quality deteriorates when devices are in close proximity due to invalidation of spatial bases assumptions
Solution Approach 1:
The antenna array is divided into multiple sub-arrays, each handling a specific spatial sector. This segmentation allows the system to maintain planar wave assumptions within each sub-array while covering a broader spatial range, thus preserving ease of operation while improving reliability in near-field scenarios.
Solution Approach 2:
The patent introduces curved wavefront models to account for spherical wave propagation in near-field conditions. By incorporating curvature corrections into the spatial basis functions, the system maintains accuracy for close-proximity devices while preserving the overall planar array structure for far-field operations.
2Device complexity
If antenna array configurations assume planar wave propagation, then device complexity is reduced, but measurement precision deteriorates when devices are in close proximity due to spatial non-stationarity
Solution Approach 1:
The system dynamically selects between planar and curved wavefront models based on the distance between devices. For far-field communications, simple planar assumptions are used; for near-field communications, curved wavefront models are activated. This dynamic adaptation improves measurement precision without permanently increasing device complexity.
Solution Approach 2:
The patent modifies the wavefront curvature parameter based on device proximity. When devices are in close proximity, the curvature parameter is adjusted to account for spherical propagation, improving CSI acquisition accuracy. When devices are far apart, the curvature parameter reverts to planar assumptions, maintaining low complexity.
3Measurement precision
If advanced codebooks considering curved wavefronts are implemented, then measurement precision is improved for near-field propagation, but device complexity increases
Solution Approach 1:
The codebook is segmented into multiple sections, each optimized for specific angular ranges and propagation conditions. This allows the system to use simplified codebook entries for far-field communications while having access to more complex curved-wavefront-based entries when near-field precision is required, balancing complexity and accuracy.
Solution Approach 2:
The codebook design incorporates multi-functional basis functions that can represent both planar and curved wavefronts through parameter adjustment. This universal codebook structure improves measurement precision for near-field propagation while avoiding the need for completely separate complex codebooks, thus limiting the increase in device complexity.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods to provide sub-division of antenna arrays in wireless communication systems.