Multi-TRP CSI Configuration via TCI State Segmentation
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Solution Overview
Problem
Current 5G wireless systems face challenges in efficiently configuring and reporting channel state information (CSI) for multi-transmission reception point (TRP) operations, leading to increased UE complexity and resource overhead due to the need for monitoring multiple reference signals and limited CSI reporting capabilities for single TRP operations.
Innovation Solution
The method involves signaling a set of combinations of transmission configuration indicator (TCI) states via MAC-CE, using an enhanced format that supports multiple TCI states, and configuring UEs to provide independent CSI feedback per TRP with various reporting options to optimize CSI resource usage and reduce unnecessary measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple reference signals are monitored for multi-TRP operations, then CSI accuracy is improved, but UE complexity increases
Solution Approach 1:
The patent segments the reference signals into different types (CSI-RS for channel measurement, TRS for tracking, SSB for initial access) and configures them separately for different TRPs. This segmentation allows the UE to process reference signals in an organized manner, reducing complexity while maintaining CSI accuracy for multi-TRP operations.
Solution Approach 2:
The network performs preliminary configuration of TCI states and reference signals before actual CSI measurement. By pre-configuring which reference signals correspond to which TRPs and their spatial relationships, the UE avoids complex real-time decisions about which signals to measure, thereby reducing UE complexity while ensuring accurate CSI acquisition.
2Adaptability or versatility
If comprehensive CSI reporting is implemented, then scheduling flexibility is improved, but resource overhead increases
Solution Approach 1:
The patent implements dynamic CSI reporting where the UE adaptively selects which TRPs to report based on current channel conditions and network configuration. The reporting content and frequency are dynamically adjusted according to traffic requirements and channel variability, providing scheduling flexibility while minimizing unnecessary resource overhead for stable channels.
Solution Approach 2:
Different CSI reporting configurations are applied to different TRPs based on their individual characteristics and importance. Critical TRPs receive more comprehensive monitoring and reporting, while less critical TRPs use reduced reporting schemes. This local differentiation maintains scheduling flexibility for important links while reducing overall resource overhead.
3Adaptability or versatility
If TCI state combinations are signaled for each codepoint, then multi-TRP transmission flexibility is improved, but MAC-CE overhead increases
Solution Approach 1:
The patent merges the indication of multiple TCI states into a single MAC-CE message by encoding combinations of TCI state indices. Instead of sending separate indications for each TCI state, the invention combines them into a unified codepoint structure, reducing the number of MAC-CE messages required while maintaining the ability to signal multiple TRP configurations.
Solution Approach 2:
The patent changes the parameter representation by using codepoints that map to combinations of TCI states rather than individual TCI state indices. This parameter transformation allows the system to convey multiple TRP configuration options in a compact form, improving multi-TRP transmission flexibility while controlling MAC-CE overhead through efficient codepoint encoding.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for channel state information (CSI) configuration and reporting for multi-transmission reception point (TRP) operation are provided. One method may include configuring a user equipment (UE), by a network node, to provide independent channel state information (CSI) feedback per transmission reception point (TRP) and to indicate additional information. The configuring of the UE may include configuring the UE with at least one of several reporting options for generating a combined channel state information (CSI) report.