Multi-TRP CSI Reporting With TRP-Specific Codebook Precoding
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel state information (CSI) reports, particularly in scenarios involving multiple transmission reception points (TRPs), leading to inefficiencies in beamforming and interference management.
Innovation Solution
The proposed method involves configuring user equipment (UE) with CSI report settings that include TRP-specific spatial domain basis vectors and frequency domain indicators, allowing for precise CSI reporting that reduces redundancy and enhances coherent joint transmission (CJT) among multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional CSI reporting methods are used in multi-TRP scenarios, then the system can maintain simpler reporting structures, but the accuracy and efficiency of CSI reporting deteriorates due to redundancy and lack of TRP-specific optimization
Solution Approach 1:
The patent segments the CSI reporting structure by introducing TRP-specific spatial domain basis vectors (W1(p)) for each transmission reception point. This segmentation allows the UE to report channel state information separately optimized for each TRP, improving measurement precision by capturing TRP-specific channel characteristics while maintaining manageable complexity through structured codebook designs.
Solution Approach 2:
The patent applies local quality by enabling different spatial domain basis vectors for different TRPs based on their specific channel conditions. Each TRP can have customized W1(p) matrices that reflect local channel properties, allowing the system to adapt the CSI reporting quality locally to each TRP's characteristics rather than using a uniform approach.
2Reliability
If redundant CSI information is reported for multiple TRPs, then the system can ensure comprehensive channel state coverage, but the overhead and inefficiency of CSI reporting increases
Solution Approach 1:
The patent merges the CSI reporting for multiple TRPs into a unified codebook structure where the overall precoder matrix W is constructed from TRP-specific components W1(p) and common components W2. This merging allows comprehensive channel state information to be reported in a coordinated manner that reduces redundancy, as the structured combination shares common elements across TRPs while maintaining TRP-specific accuracy.
Solution Approach 2:
The patent creates a universal CSI reporting framework that handles multiple TRPs through a common codebook structure. The W2 matrix serves multiple TRPs simultaneously by providing common spatial refinement, while the W1(p) matrices handle TRP-specific characteristics. This multi-functional approach ensures complete channel state coverage across all TRPs without requiring separate independent reporting for each.
3Productivity
If TRP-specific spatial domain basis vectors are implemented, then the beamforming accuracy and coherent joint transmission performance improves, but the computational complexity and processing requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-defining the codebook structures W1 and W2 before actual transmission. The TRP-specific spatial domain basis vectors W1(p) are selected from predefined codebooks based on channel measurements, and the overall precoder W is constructed using predetermined combination rules with W2. This preliminary structuring reduces real-time computational complexity while maintaining high beamforming accuracy for coherent joint transmission.
Solution Approach 2:
The patent introduces dynamics by allowing the UE to adaptively select different W1(p) matrices from codebooks based on measured channel conditions for each TRP. The system dynamically adjusts the precoder configuration to match current channel states, enabling efficient coherent joint transmission while managing computational complexity through codebook-based selection rather than full optimization.
Data Source
AI summary
A method of channel state information (CSI) report can include receiving a CSI report configuration at a user equipment (UE) from a base station, the CSI report configuration being associated with a set of CSI reference signal (CSI-RS) resources corresponding to multiple transmission reception points (TRPs), performing a channel measurement based on the CSI-RSs resources corresponding to the multiple TRPs, determining a precoder matrix indicator (PMI) based on measurement results of the channel measurement, the PMI corresponding to a precoder matrix, denoted W, of a Type II CSI codebook, the precoder matrix having a spatial domain (SD) basis vector matrix, denoted W1, SD basis selection of the SD basis vector matrix being TRP-specific, and transmitting a CSI report to the base station, the CSI report including the PMI.