Multi-TRP Codebook Precoding Using Consolidated CSI Feedback
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Solution Overview
Problem
In mobile communication systems with multiple transmission reception points (TRPs) serving a terminal, determining precoding for collaborative data transmission is challenging due to the need for coordinated precoding across these TRPs.
Innovation Solution
A method where a terminal measures channel status information (CSI) for each CSI-RS resource, reporting CSI that includes indication information for multiple CSI-RS resources or port groups, allowing a network device to determine precoding based on a codebook structure and shared parameters among TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate precoding is determined for each TRP, then precoding can be optimized individually, but coordination between TRPs becomes complex and feedback overhead increases
Solution Approach 1:
The patent merges the precoding determination process for multiple TRPs into a unified codebook structure. The codebook is constructed by combining codebook entries from different TRPs in a coordinated manner, allowing the terminal to report a single consolidated CSI that reflects the joint channel conditions. This eliminates the need for separate precoding determination for each TRP while maintaining coordination benefits.
Solution Approach 2:
The codebook structure is designed to serve multiple TRPs simultaneously. A single codebook entry can represent precoding configurations for multiple TRPs, making the system more universal. The terminal reports CSI that is valid for all TRPs, and the network device can determine precoding that works across the entire TRP group, reducing overall system complexity.
2Measurement precision
If detailed channel information is reported for each TRP, then precoding accuracy is improved, but feedback overhead increases
Solution Approach 1:
The patent combines channel status information from multiple TRPs into a single CSI report. Instead of reporting detailed channel information separately for each TRP, the terminal measures and reports aggregated channel state information that captures the essential characteristics of the multi-TRP channel. This reduces feedback overhead while preserving the precision needed for accurate precoding determination.
Solution Approach 2:
The patent extracts only the necessary channel information components needed for precoding determination. Rather than reporting all possible channel metrics for each TRP, the system identifies and reports only the critical parameters (such as reference signal received power, signal-to-interference-plus-noise ratio, and codebook entry indices) that are sufficient for accurate precoding, thereby reducing feedback overhead.
3Productivity
If multiple TRPs are served simultaneously, then service coverage and capacity are improved, but precoding coordination becomes challenging
Solution Approach 1:
The patent segments the precoding determination process into independent codebook entry selection for each TRP, followed by coordinated combination. Each TRP's channel conditions are evaluated independently to select appropriate codebook entries, and then these entries are combined according to a coordination mechanism. This segmentation allows simple local decisions while achieving complex global coordination without increasing overall system complexity.
Data Source
AI summary
Codebook-based precoding determination methods and apparatuses, and a device and a storage medium, which relate to the field of mobile communications. A codebook-based precoding determination method comprises: according to determined channel information corresponding to each channel status information (CSI)-RS resource, and codebook parameter information, a terminal sending CSI to a network device, wherein the CSI comprises indication information corresponding to a plurality of CSI-RS resources and indication information corresponding to each CSI-RS resource, or indication information corresponding to a plurality of port groups in one CSI-RS resource and indication information corresponding to each port group, and the CSI is used for determining precoding for the terminal on the basis vector of a codebook structure corresponding to the codebook parameter information.