CSI-RS Resource Indicator and Rank Indicator Concatenation
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Solution Overview
Problem
In wireless communication systems, particularly in multi-node cooperative communication schemes, there is a need for efficient methods to report channel state information (CSI) and configure CSI-RS resources to enhance data transmission and reception quality, while reducing interference and increasing throughput.
Innovation Solution
A method for reporting channel state information in a wireless communication system involves generating and reporting CSI-RS resource indicators and rank indicators, which are configured and concatenated for efficient transmission, allowing for improved channel state reporting and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple CSI-RS resources are configured for CSI process, then channel state reporting accuracy is improved, but feedback overhead and processing complexity increase
Solution Approach 1:
The patent segments the CSI-RS resource configuration by introducing a CRI (CSI-RS Resource Indicator) that divides the feedback into two parts: CRI indicating the selected CSI-RS resource among multiple configured resources, and RI (Rank Indicator) indicating the transmission rank. This segmentation allows the UE to report channel state information for multiple CSI-RS resources without transmitting complete CSI reports for each resource, thereby reducing feedback overhead while maintaining reporting accuracy.
Solution Approach 2:
The patent extracts only the essential information needed for multi-resource CSI reporting by separating CRI from the traditional RI feedback. Instead of reporting full CSI for multiple resources, the system extracts and reports only the CRI (resource selection) and RI (rank information), removing redundant feedback data while preserving the ability to accurately report channel state across multiple CSI-RS resources.
2Productivity
If CRI and RI are concatenated for reporting, then reporting efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent merges CRI and RI into a single concatenated feedback message transmitted by the UE to the BS. This combining of resource indication and rank indication into one unified report structure improves reporting efficiency by reducing the number of separate feedback transmissions required, while the standardized concatenation format manages processing complexity through systematic bit-level organization.
Data Source
AI summary
The present specification relates to a wireless communication system and, more particularly, to a method for reporting a channel state and an apparatus therefor. When a plurality of channel state information-reference signal (CSI-RS) resources are set for a channel state information (CSI) process, a terminal of the present invention generates channel state information indicating a CSI-RS resource indicator (CRI) indicating one of the plurality of CSI-RS resources and a rank indicator (RI) which is based on the CRI. The terminal reports the channel state information. Accordingly, the present invention is capable of more efficient channel state reporting by transmitting a CRI indicating a CSI-RS resource, selected from among a plurality of CSI-RS resources set for the CSI process, together with the RI for the selected CSI-RS resource.