Multi-Layer Spatial Domain Basis Selection Across Orthogonal Dimensions
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Solution Overview
Problem
Existing wireless communications systems have limited flexibility in selecting spatial domain (SD) bases, particularly when choosing orthogonal SD bases for multiple communication layers, which can lead to reduced communication quality, throughput, resource utilization, and increased overhead and latency.
Innovation Solution
The UE selects a first SD basis from a set of possible SD bases and a second SD basis from a subset of these bases, ensuring orthogonality in one or two dimensions of the SD basis selection space, allowing for more flexible SD basis selection and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a limited set of SD bases is used for selection, then device complexity is reduced, but communication quality and throughput deteriorate
Solution Approach 1:
The SD basis selection space is segmented into multiple dimensions (e.g., first dimension, second dimension, third dimension), allowing independent selection along each dimension. This segmentation enables the system to explore a larger effective search space while maintaining manageable complexity in each individual dimension, thereby improving communication quality without overwhelming device complexity.
Solution Approach 2:
The patent extends the SD basis selection from traditional two-dimensional selection to three-dimensional or higher-dimensional selection spaces. By adding additional dimensions to the selection space, the system can achieve more flexible SD basis combinations and improve communication quality and throughput while distributing the selection complexity across multiple dimensions rather than concentrating it in a single plane.
2Productivity
If orthogonal SD bases are selected for multiple communication layers, then resource utilization improves, but selection flexibility is reduced
Solution Approach 1:
The orthogonal SD basis selection process is segmented into dimension-specific selections. Each dimension can be selected independently while ensuring orthogonality constraints are met across dimensions. This segmentation allows the system to maintain resource utilization through orthogonality while gaining flexibility through independent dimension selection, resolving the contradiction between these two requirements.
Solution Approach 2:
By extending to three-dimensional SD basis selection space, the patent provides additional degrees of freedom for selecting orthogonal bases across multiple communication layers. The extra dimension allows for more flexible combinations of orthogonal SD bases, enabling better adaptation to different channel conditions while maintaining the orthogonality required for efficient resource utilization.
3Measurement precision
If extensive SD basis measurements are performed, then measurement precision improves, but latency increases
Solution Approach 1:
The measurement and selection process is segmented into dimension-specific stages. Instead of performing exhaustive measurements across the entire high-dimensional space, the system performs measurements and selections along each dimension separately. This segmentation reduces the total measurement time and latency while maintaining measurement precision through focused, dimension-specific measurement campaigns.
Solution Approach 2:
The patent's three-dimensional selection framework allows for more efficient measurement strategies by distributing measurements across multiple dimensions. Rather than requiring comprehensive measurements of all possible SD basis combinations in a flat space, the dimensional structure enables progressive measurement and selection along each axis, reducing overall latency while achieving precise SD basis identification through cumulative dimensional information.
Data Source
AI summary
Methods, systems, and devices for wireless communications at a user equipment (UE) are described. The UE may receive one or more reference signals. The UE may select, from among a set of spatial domain (SD) bases, a first SD basis. The UE may select, from among a subset of the set of SD bases, a second SD basis, where the subset of the set of SD bases comprises a first group and a second group, where each SD basis of the first group is orthogonal to the first SD basis in one dimension, and where each SD basis of the second group is orthogonal to the first SD basis in two dimensions. The UE may transmit a report indicative of the first SD basis and the second SD basis.