CSI Reporting for Multi-TRP Transmission
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Solution Overview
Problem
Current New Radio (NR) systems face challenges in CSI reporting for multiple transmission reception points (TRPs), as existing solutions are based on single TRP configurations and do not apply to multiple TRP transmissions, leading to inefficiencies in CSI measurement and reporting.
Innovation Solution
A method for transmitting and receiving CSI reports for multiple TRPs, where a terminal device transmits multiple CSI reports for each TRP within a CSI-RS resource set, and a network device receives these reports to obtain CSI information, with the option to use an offset value to reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single TRP CSI reporting configuration is used for multiple TRP transmission, then existing NR system can maintain backward compatibility, but CSI measurement and reporting become inefficient and inaccurate for multiple TRP scenarios
Solution Approach 1:
The patent segments the CSI reporting process by introducing separate reporting mechanisms for different TRPs. Each TRP can have its own CSI-RS resource set and reporting configuration, allowing independent optimization of CSI measurement for each transmission point while maintaining overall system compatibility.
Solution Approach 2:
The patent extends the single-TRP CSI reporting framework to multi-TRP scenarios by adding a TRP dimension. This is achieved through introducing TCI states and multi-TRP resource set configurations, transforming the reporting structure from scalar to multi-dimensional without breaking existing NR system operations.
2Measurement precision
If multiple separate CSI reports are transmitted for each TRP, then CSI measurement accuracy improves, but signaling overhead increases
Solution Approach 1:
The patent merges multiple TRP-specific CSI reports into a unified reporting structure where common parameters can be shared across TRPs. The joint reporting mechanism allows the UE to report CSI for multiple TRPs in a single uplink transmission, reducing redundant signaling while preserving measurement precision for each TRP.
Solution Approach 2:
The patent creates a universal CSI reporting framework that can handle both single-TRP and multi-TRP scenarios. The same reporting structure adapts to different numbers of TRPs through configurable parameters, eliminating the need for separate reporting mechanisms and reducing overall signaling overhead.
3Adaptability or versatility
If TRPs are configured with different QCL assumptions, then beam management flexibility improves, but CSI feedback complexity increases
Solution Approach 1:
The patent applies local quality by allowing different QCL assumptions and beam configurations for each TRP while maintaining a unified reporting structure. Each TRP can have its own TCI state and beam management parameters, enabling localized optimization without requiring completely separate feedback mechanisms for each TRP.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and apparatuses of channel state information (CSI) reporting for multiple reception point (TRP) transmission. In an embodiment of the present disclosure, a method may include transmitting a first CSI report on a first TRP of multiple TRPs serving a terminal device for a channel state information reference signal (CSI-RS) resource set for CSI acquisition. The method may further include transmitting a second CSI report on a second TRP of the multiple TRPs serving the terminal device for the CSI-RS resource set. With embodiments of the present disclosure, it is possible to support CSI reporting for multiple TRP transmission.