Multi-TRP CSI Reporting with Codebook Compression and CRI Priority
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Solution Overview
Problem
In 5G wireless communication systems, the excessive control signaling and large amount of channel state information (CSI) feedback required for multiple transmit/receive points (TRPs) lead to inefficiencies, particularly with high-resolution NR Type-II codebooks, resulting in significant overhead and reduced efficiency.
Innovation Solution
Implementing methods and apparatuses to optimize CSI reporting by reducing the number of Precoding Matrix Indicator (PMI) feedback bits and modifying CSI omission priorities, using DFT-based spatial and IDFT-based frequency domain compression techniques for CSI feedback, and jointly designing reports for multi-TRP/Panel transmission configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution NR Type-II codebooks are used for CSI feedback in multi-TRP scenarios, then measurement precision is improved, but control signaling overhead increases significantly
Solution Approach 1:
The patent extracts only the essential CSI components needed for multi-TRP operation by selectively reporting CRI and TCI state information only when applicable, rather than transmitting complete high-resolution codebook feedback for all scenarios. This reduces overhead while maintaining necessary measurement precision.
Solution Approach 2:
The CSI feedback is segmented into multiple priority levels, with critical information (CRI, TCI states) reported first, followed by optional higher-resolution parameters only when resources permit. This segmentation allows the system to maintain measurement precision for essential parameters while reducing overall signaling overhead.
2Reliability
If comprehensive CSI reports are transmitted for multiple TRPs, then reliability is improved, but productivity decreases due to increased processing time
Solution Approach 1:
The patent implements partial reporting where only the most critical CSI parameters (CRI, TCI states) are always reported, while additional detailed parameters are reported selectively based on available resources and channel conditions. This ensures reliability for essential information while improving processing efficiency by avoiding unnecessary computation and transmission of redundant data.
Solution Approach 2:
CSI reporting is configured with different periodicities and priorities, allowing the system to transmit comprehensive reports periodically for reliability while using more efficient abbreviated reports between periodic updates, thus balancing reliability requirements with processing efficiency.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for channel state information reporting for multiple transmit/receive points. One apparatus includes a transceiver that receives an indication from a mobile wireless communication network that channel state information (“CSI”) corresponding to multiple transmit/receives points (“TRPs”) is to be reported and a processor that generates at least one CSI report according to the CSI reporting configuration, the at least one CSI report comprising a CSI-reference signal (“CSI-RS”) resource indicator (“CRI”), wherein the transceiver reports the at least one CSI report comprising the CRI to the mobile wireless communication network.