Multi-TRP Channel State Reporting with Space-Domain Basis Vectors
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Solution Overview
Problem
In frequency division duplex massive multiple-input multiple-output (FDD massive MIMO) systems, the non-reciprocal nature of uplink and downlink channels hinders accurate determination of downlink channel state information (CSI), especially in multi-TRP coordinated transmission scenarios, necessitating improved methods for reporting channel state parameters across multiple transmission reception points (TRPs).
Innovation Solution
A method involving a terminal device determining and reporting the quantity of space domain basis vectors corresponding to multiple CSI-RS resources, using indication information to convey this quantity, allowing a network device to derive precoding matrices for each TRP, thereby enhancing CSI acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional channel state information reporting methods are used for single TRP, then the reporting overhead is low and the system is simple, but the system cannot meet the higher requirements for system capacity and spectral efficiency in multi-TRP coordinated transmission scenarios
Solution Approach 1:
The patent segments the channel state information reporting by dividing it into two parts: CSI part 1 containing the first indication information (total quantity of space domain basis vectors), and CSI part 2 containing the second indication information (quantized values for each TRP). This segmentation allows the system to handle multi-TRP scenarios while maintaining structured and manageable reporting overhead.
Solution Approach 2:
The patent introduces a new dimension for channel state information reporting by adding indication information that specifies the quantity of space domain basis vectors for each TRP. This additional dimensional parameter enables the system to differentiate and report channel states for multiple TRPs simultaneously, transitioning from single-TRP to multi-TRP reporting capability.
2Measurement precision
If channel state information is reported for multiple TRPs, then the downlink channel state can be accurately determined, but the reporting overhead increases
Solution Approach 1:
The patent changes the parameter representation by using quantized values to indicate the quantity of space domain basis vectors for each TRP. Instead of reporting full channel state matrices, the system reports quantized parameters that capture the essential channel characteristics, thereby reducing uplink overhead while maintaining measurement precision.
Solution Approach 2:
The patent extracts only the essential information needed for multi-TRP channel state determination by reporting the quantity of space domain basis vectors for each TRP through indication information. This extraction approach retrieves only the critical parameters required for accurate downlink channel state determination without transmitting redundant data, thus reducing overhead.
3Manufacturing precision
If the quantity of space domain basis vectors is increased for each TRP, then the precoding matrix accuracy improves, but the processing complexity and overhead increase
Solution Approach 1:
The patent applies partial action by reporting quantized values for the quantity of space domain basis vectors rather than reporting complete precoding matrices. This partial reporting provides sufficient accuracy for precoding matrix determination while avoiding the excessive complexity of transmitting and processing full-rank matrices for each TRP.
Data Source
AI summary
This disclosure provides a channel state parameter reporting method, an apparatus, and a system. The method includes: A terminal device obtains a quantity of space domain basis vectors respectively corresponding to N channel state information reference signal (CSI-RS) resources, where the N CSI-RS resources are determined in Q CSI-RS resources, N is a positive integer less than or equal to Q, and Q is a positive integer greater than 1; and sends indication information, where the indication information indicates the quantity of space domain basis vectors respectively corresponding to the N CSI-RS resources.