UCI Bit Sequence Generation for Multi-TRP CSI Reporting
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Solution Overview
Problem
The excessive control signaling and super-linear increase in CSI feedback from UE to network in multi-TRP transmission configurations for 3GPP NR, particularly with high-resolution PMI feedback, lead to inefficiencies and increased overhead, necessitating a reduction in PMI feedback bits to enhance spectral efficiency and reliability.
Innovation Solution
The proposed solution involves generating a UCI bit sequence for CSI reporting under multi-TRP transmission, which includes decomposing CSI reports, applying DFT-based CSI compression, and prioritizing CSI feedback to reduce the number of bits needed for PMI feedback, specifically using block-diagonal matrices and discrete Fourier transform matrices to compress spatial and frequency domain information, and partitioning CSI reports into prioritized parts for efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP transmission is implemented to enhance coverage and throughput, then reliability and coverage are improved, but control signaling overhead and CSI feedback complexity increase excessively
Solution Approach 1:
The patent segments the CSI feedback into two distinct parts: Part 1 contains essential information (RI, CQI, and selected PMI elements) that can be decoded independently, while Part 2 contains additional detailed CSI information. This segmentation allows the network to reliably decode critical feedback without requiring the full complexity of complete CSI reports, thereby reducing overall signaling overhead while maintaining transmission reliability.
Solution Approach 2:
The patent extracts and prioritizes the most critical CSI elements (rank indicator, channel quality indicator, and selected precoding matrix elements) to be included in Part 1 of the feedback. By taking out only the essential information needed for reliable transmission decisions and separating it from less critical detailed CSI data, the system reduces feedback overhead while preserving the reliability needed for multi-TRP transmission decisions.
2Measurement precision
If high-resolution PMI feedback is provided for each transmission configuration, then transmission precision is improved, but feedback overhead increases super-linearly
Solution Approach 1:
The patent extracts only the most significant PMI elements (such as beam indices and dominant eigenvectors) and places them in Part 1 of the feedback, while relegating less critical PMI details to Part 2. This selective extraction maintains the precision needed for accurate precoding while dramatically reducing the total number of feedback bits required, thus resolving the super-linear overhead problem.
Solution Approach 2:
The patent implements partial PMI feedback by providing high-resolution precision for the most critical precoding parameters in Part 1, while providing reduced or selective precision for less critical parameters in Part 2. This partial action approach ensures that the essential precision needed for reliable multi-TRP transmission is maintained while avoiding the excessive overhead of providing full high-resolution PMI for all transmission configurations.
3Manufacturing precision
If distinct CSI reports are generated for each transmission configuration, then transmission accuracy is improved, but feedback overhead increases excessively
Solution Approach 1:
The patent merges multiple transmission configuration evaluations into a unified two-part feedback structure. Instead of generating separate complete CSI reports for each TRP or transmission hypothesis, the system combines the essential findings across all configurations into Part 1 (with critical metrics like RI, CQI, and selected PMI) and places configuration-specific details in Part 2. This merging approach maintains transmission configuration accuracy while avoiding the multiplicative overhead of distinct complete reports for each configuration.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for generating a UCI bit sequence for CSI reporting under multi-TRP transmission. An apparatus (1300) includes a transceiver (1325) that receives a channel state information (“CSI”) reporting setting associated with one or more CSI resource settings, and one or more non-zero power (“NZP”) CSI reference signal (“CSI-RS”) resources for channel measurement transmitted from one or more transmission points in the network. The apparatus (1300) includes a processor (1305) that generates a CSI report comprising CSI corresponding to at least a subset of CSI indicator types, each CSI indicator type corresponding to at least one transmission hypothesis of a joint transmission hypothesis, a first single-point transmission hypothesis, and a second single-point transmission hypothesis, and at least one segment comprising values of the subset of the CSI indicator types that are ordered in an order of at least one transmission hypothesis.