CSI Reporting for Multi-TRP Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving channel state information (CSI) across multiple transmission reception points (TRPs), leading to suboptimal link adaptation and performance in next-generation mobile communication systems.
Innovation Solution
A method and apparatus for transmitting and receiving CSI, where a terminal receives configuration information from a base station, including CSI-reference signal (CSI-RS) resource sets, and transmits CSI based on this information, allowing for optimal CSI reporting for single and multiple TRPs, with prioritization mechanisms for collision scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If CSI reporting is performed for multiple TRPs using existing methods, then system complexity increases, but measurement precision and link adaptation accuracy deteriorate
Solution Approach 1:
The patent segments the CSI reporting process by introducing separate CSI report types (first CSI report for single TRP, second CSI report for multiple TRPs) and dividing the CSI-RS resource set into multiple resource groups. Each report type uses specific resource groups, preventing measurement confusion and maintaining precision while managing complexity through structured segmentation.
Solution Approach 2:
The patent introduces configuration information as an intermediary that mediates between the base station and terminal for CSI reporting. The configuration information specifies which CSI-RS resource groups correspond to single TRP or multiple TRPs, enabling the terminal to perform appropriate measurements without directly handling the complexity of multi-TRP coordination, thus maintaining measurement precision.
2Measurement precision
If separate CSI reports are generated for each TRP configuration, then link adaptation accuracy improves, but information transmission overhead increases
Solution Approach 1:
The patent merges multiple CSI measurements into a unified CSI report structure. The terminal generates a first CSI report based on measurements from a first CSI-RS resource group (single TRP) and a second CSI report based on measurements from a second CSI-RS resource group (multiple TRPs), then transmits both reports to the base station. This merging approach maintains accurate link adaptation information while consolidating transmission through standardized report formats.
Solution Approach 2:
The patent creates a universal CSI reporting framework that handles both single-TRP and multi-TRP scenarios using the same basic report structure and transmission mechanism. The configuration information universally applies to all CSI-RS resource groups, allowing the system to maintain measurement precision for different TRP configurations while using a single versatile reporting protocol.
3Adaptability or versatility
If CSI-RS resource sets are expanded to support multiple TRPs, then system adaptability improves, but device complexity increases
Solution Approach 1:
The patent segments the CSI-RS resource set into multiple resource groups, where each group is associated with specific TRP configurations. The base station configures the terminal with information about which resource groups correspond to single TRP or multiple TRP scenarios, enabling the terminal to adapt to different TRP configurations without managing the entire resource set as a single complex entity.
Solution Approach 2:
The patent employs preliminary configuration where the base station pre-configures the terminal with CSI-RS resource group information and their corresponding TRP associations before actual CSI measurement and reporting. This preliminary action allows the terminal to be pre-prepared for multi-TRP operations, reducing runtime complexity while maintaining high adaptability to different TRP scenarios.
Data Source
AI summary
Disclosed are a method and apparatus for transmitting and receiving channel state information in a wireless communication system. The method for transmitting channel state information (CSI) according to an embodiment of the present disclosure, may comprise the steps of: receiving, from a base station, configuration information related to the CSI, wherein the configuration information includes information about a CSI-RS resource set; receiving a CSI-reference signal (CSI-RS) from the base station; and transmitting the CSI, to the base station, on the basis of the configuration information and the CSI-RS. The CSI-RS resource set may include M CSI-RS resource groups (M is a natural number), and the CSI may include N first CSI sets generated on the basis of a single CSI-RS resource in N mutually different CSI-RS resource groups (N≤M, N is a natural number) from among the M CSI-RS resource groups.