Uplink Precoding Matrix Selection for High-Layer NR MIMO
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Solution Overview
Problem
Traditional uplink transmission in the 3GPP NR system supports only a maximum of 4 antenna ports and 4 layers, which cannot meet the high throughput requirements of customer premise equipment, fixed wireless access, vehicle, and industrial application scenarios.
Innovation Solution
The method involves determining precoding matrices using full-coherent and partial-coherent codewords, along with zero matrices, to support uplink transmission with more antenna ports and layers, by combining matrices from existing codebooks to create candidate precoding matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional codebook-based uplink MIMO transmission is used, then the system is simple to implement, but it only supports maximum 4 antenna ports and 4 layers which cannot satisfy high throughput requirements
Solution Approach 1:
The patent segments the precoding matrix construction into modular components: full-coherent codewords, partial-coherent codewords, and zero matrices. These segmented elements can be flexibly combined to support different numbers of antenna ports and layers, enabling the system to scale beyond the traditional 4x4 limitation while maintaining manageable complexity through standardized building blocks.
Solution Approach 2:
The patent extends the precoding matrix dimensionality by introducing support for 8 and 16 antenna ports through systematic expansion of the codebook structure. By defining new matrix types (first-type with full-coherent codewords, second-type with partial-coherent codewords, third-type with non-coherent codewords) and their combinations, the system transitions from 4-layer to 8-layer and 16-layer MIMO, achieving higher throughput through increased spatial dimensions.
2Productivity
If the number of antenna ports and layers is increased to support high throughput, then uplink throughput improves, but the complexity of determining and managing precoding matrices increases
Solution Approach 1:
The patent implements dynamic precoding matrix determination through type indication information that allows the terminal to select among first-type, second-type, and third-type matrices based on channel conditions and coherence requirements. This dynamic selection mechanism enables the system to adapt to varying operational scenarios (full-coherent, partial-coherent, non-coherent) without requiring manual reconfiguration, maintaining ease of operation while supporting increased antenna ports and layers.
Solution Approach 2:
The patent changes key parameters of the precoding matrix structure by defining different matrix types with distinct properties: full-coherent codewords for maximum spatial multiplexing, partial-coherent codewords for intermediate scenarios, and zero matrices for nulling interference. By parameterizing the matrix construction with type indicators and coherence assumptions, the system manages the complexity of determining appropriate matrices for 8 and 16 antenna ports through systematic parameter selection rather than exhaustive search.
Data Source
AI summary
Embodiments of the present invention provide an uplink transmission method, a terminal, a network device, an apparatus, and a storage medium. The method comprises: receiving precoding matrix indication information; determining, from candidate precoding matrixes, a precoding matrix indicated by the precoding matrix indication information, the candidate precoding matrixes comprising a first type of matrixes and/or a second type of matrixes, the first type of matrixes being determined on the basis of a fully-coherent codeword and a zero matrix, and the second type of matrixes being determined on the basis of a partially-coherent codeword or a non-coherent codeword; and on the basis of the precoding matrix, performing uplink transmission.