Non-PMI CSI Reporting With Three CSI-RS Groups for Multi-TRP
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Solution Overview
Problem
Current wireless communication systems lack efficient non-precoder matrix index (PMI) channel state information (CSI) reporting enhancements for multi-transmission and reception points (multi-TRPs), particularly in non-coherent joint transmission (NC-JT) scenarios, leading to suboptimal performance and limitations in switching between single TRP and multi-TRP operations.
Innovation Solution
Configuring three groups of CSI-RS resources for single and multi-TRP operations, with defined bit-widths for CSI-RS resource indicators (CRIs) and restrictions on the number of resources, allowing UEs to report preferred operation modes and optimizing CSI reporting for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP operation is implemented without CSI reporting enhancements, then network coverage and capacity are improved, but CSI reporting accuracy and efficiency deteriorate
Solution Approach 1:
The patent segments the CSI reporting process by dividing CSI-RS resources into three distinct groups: first set for single TRP operation, second set for single TRP operation, and third set for multi-TRP operation. This segmentation allows the UE to report CSI preferences for different operation modes separately, improving measurement precision for multi-TRP scenarios while maintaining network coverage benefits
Solution Approach 2:
The patent introduces a new dimension to CSI reporting by adding operation mode indication (single TRP vs. multi-TRP) as an additional parameter. The CRI report includes not only CSI-RS resource indicators but also indicates the preferred operation mode, enabling the base station to optimize CSI reporting based on the specific operational context
2Measurement precision
If three groups of CSI-RS resources are configured for single and multi-TRP operations, then CSI reporting accuracy is improved, but device complexity increases
Solution Approach 1:
The patent makes the CSI-RS resource configuration universal by allowing the same resource set to serve multiple purposes. The base station configures CSI-RS resources that can be used for both single TRP and multi-TRP operations, with the UE indicating its preference through the CRI report. This multi-functionality reduces the need for separate dedicated resources for each operation mode
Solution Approach 2:
The patent utilizes parameter changes in the CRI report to convey operation mode information. Instead of configuring completely separate resource sets, the system changes the indication parameters (CRI values and associated operation mode flags) to distinguish between single TRP and multi-TRP preferences, reducing configuration complexity
3Adaptability or versatility
If CRI report includes operation mode indication, then adaptability between single and multi-TRP modes is improved, but information overhead increases
Solution Approach 1:
The patent merges the operation mode indication with the existing CRI report structure. The CRI report combines CSI-RS resource indicators with operation mode preferences in a unified feedback mechanism, allowing the base station to receive both resource selection and mode preference information in a single report without requiring separate signaling channels
Data Source
AI summary
Apparatuses, systems, and methods for enhancing non-PMI based CSI reporting for NC-JT in multi-TRP operations, including addressing channel CRI reporting, CQI reporting, RI reporting, and CSI processing complexity and timeline in NC-JT multi-TRP operations. For example, a UE may receive, from a base station, a configuration for a first set of CSI-RS resources for a first TRP (associated with single TRP operation), a second set of CSI-RS resources for a second TRP (associated with single TRP operation), and a third set of pairs of CSI-RS resources for the first TRP and second TRP (associated with multi-TRP operation). The UE may report, to the base station, a CRI report indicating whether the UE prefers single TRP operation from the first TRP or the second TRP, or multi-TRP operation from the first TRP and the second TRP. The CRI report may be based on the configuration.