Reference Signal Grid Mapping for High-Port MIMO Transmission
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Solution Overview
Problem
Current MIMO technologies are limited to supporting a maximum of 12 orthogonal ports, which is insufficient for future communication scenarios requiring hundreds or thousands of data streams, necessitating improved reference signal mapping to enhance data transmission capacity.
Innovation Solution
A flexible resource grid structure is introduced, allowing for more reference signal antenna ports to be mapped contiguously, with identical multiplexing manners across resource grids, enabling a nested structure that reduces receiver complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of reference signal antenna ports is increased to support more data streams, then the data transmission capacity is improved, but the receiver complexity and power consumption increase
Solution Approach 1:
The resource grid is divided into multiple second resource grids, each supporting a manageable number of reference signal antenna ports. This segmentation allows the system to support a large total number of ports (e.g., 24, 48, or more) by distributing them across multiple smaller units, making the receiver processing more manageable and less complex while still achieving high data transmission capacity.
Solution Approach 2:
The patent implements a nested structure where first resource grids contain multiple second resource grids, which in turn contain reference signal antenna ports. This nested organization allows for hierarchical processing at the receiver, where channel estimation can be performed at different levels of the hierarchy, reducing the overall computational complexity compared to processing all ports simultaneously in a flat structure.
2Quantity of substance
If more reference signal antenna ports are mapped to contiguous resource grids, then the reference signal capacity is improved, but the multiplexing complexity increases
Solution Approach 1:
Each second resource grid is designed with uniform multiplexing characteristics, meaning that within each local unit (second resource grid), the reference signal antenna ports follow the same multiplexing pattern. This local uniformity simplifies the multiplexing design while allowing the overall system to support many ports by repeating the pattern across multiple second resource grids within the first resource grid.
3Productivity
If the number of orthogonal ports is increased beyond 12, then the simultaneous data stream transmission is improved, but the channel estimation accuracy may deteriorate
Solution Approach 1:
By segmenting the resource grid into multiple second resource grids, the patent enables distributed channel estimation across different resource units. Each second resource grid can be processed independently or in groups, allowing the receiver to perform channel estimation for many antenna ports without requiring all ports to be estimated simultaneously from a single resource grid, thereby maintaining estimation accuracy while supporting high productivity.
Data Source
AI summary
A network device determines a first resource grid. The first resource grid includes N second resource grids. Each second resource grid supports mapping M different reference signal antenna ports. The multiplexing manners of the M different reference signal antenna ports in each of the N second resource grids are the same. The network device outputs a reference signal based on the first resource grid.