CSI Report Configuration for Multiple-TRP Feedback Complexity
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Solution Overview
Problem
In multiple-TRP communication systems, the increasing number of transmission and reception points leads to a larger size of CSI reports, which can overwhelm the channel state feedback procedure, necessitating improved CSI report configurations to manage the information effectively.
Innovation Solution
Implementing a CSI report configuration that includes instructions for UEs to include specific quantities of layer indicator (LI) values and a strongest TRP indicator (STI) value, triggered by a report configuration message from the base station, to optimize the channel state feedback process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of TRPs is increased to improve coverage and reliability, then the system reliability is improved, but the CSI report size increases causing feedback procedure complexity to worsen
Solution Approach 1:
The patent segments the CSI report into multiple parts or components, where each part corresponds to channel state information from different TRPs. This segmentation allows the feedback procedure to handle large amounts of CSI information in a structured manner, reducing the complexity of processing the entire report at once while maintaining the reliability benefits of multiple TRPs.
Solution Approach 2:
The patent extracts and identifies the strongest TRP from multiple TRPs using a strongest TRP indicator (STI). By extracting this key information, the system can focus feedback processing on the most significant TRP while still considering contributions from other TRPs, thereby reducing feedback procedure complexity without sacrificing the reliability improvements gained from multiple TRPs.
2Area of stationary object
If the number of TRPs is increased to improve coverage, then the coverage area is improved, but the CSI report size increases causing information processing overhead to worsen
Solution Approach 1:
The patent extracts only the essential information about the strongest TRP using the strongest TRP indicator (STI), rather than including detailed channel state information from all TRPs in the CSI report. This extraction approach reduces the CSI report size significantly while still enabling the system to maintain expanded coverage through multiple TRPs, as the base station can identify and utilize the strongest signal path.
Solution Approach 2:
The patent changes the parameter representation in the CSI report by introducing condensed indicators (CRI, STI) that represent multiple TRP configurations with fewer bits. Instead of reporting full channel matrices for each TRP, the system uses these compressed parameters to represent the essential characteristics of multiple TRP channels, thereby reducing report size while preserving coverage benefits.
3Measurement precision
If detailed CSI information is included for each TRP to improve measurement precision, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the most critical measurement information by identifying and reporting the strongest TRP using the STI, rather than including complete measurement data from all TRPs. This extraction maintains measurement precision for the dominant signal path while significantly reducing the complexity of the apparatus required to process and transmit the full set of measurements from multiple TRPs.
Solution Approach 2:
The patent applies partial action by focusing measurement and reporting resources on the strongest TRP identified through the STI, rather than equally processing all TRPs. This partial approach achieves sufficient measurement precision for the most important signal path while reducing overall system complexity, as not all TRPs require the same level of detailed measurement and processing.
Data Source
AI summary
Apparatus, methods, and computer-readable media for facilitating CSI feedback in multiple-TRP communication are disclosed herein. An example method of wireless communication by a UE includes receiving, from a base station, a report configuration message triggering a channel state feedback procedure, the UE and the base station operating in a multiple transmission and reception point (multiple-TRP) communication mode, the report configuration message requesting a multiple-TRP transmission value including at least one of a quantity of layer indicator (LI) values and a strongest TRP indicator (STI) value. The example method also includes generating channel state information (CSI) information based on the receiving of the report configuration message, the CSI information including the multiple-TRP transmission value. The example method also includes transmitting, to the base station, a report including the generated CSI information.