Terminal CSI Reporting for Dynamic Single-TRP and Multi-TRP Switching
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Solution Overview
Problem
Existing NR specifications do not adequately address CSI measurement and reporting when multi-TRP (MTRP) is used, leading to potential throughput reduction and communication quality degradation.
Innovation Solution
A terminal and base station configuration that enables appropriate CSI measurement and reporting by incorporating CSI report configurations for both single-TRP and multi-TRP scenarios, supporting various transmission schemes such as mDCI based MTRP, sDCI based MTRP, SDM 1a, and SFN, and allowing for dynamic switching between single-TRP and MTRP transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing NR specifications (Rel. 15) are used without MTRP consideration, then the system maintains simplicity in CSI measurement and reporting, but system performance deteriorates with throughput reduction when MTRP is deployed
Solution Approach 1:
The patent segments CSI reporting into separate CSI reports for each TRP (first TRP and second TRP) when MTRP is configured. Each CSI report contains CSI parameters specific to its corresponding TRP, allowing independent measurement and reporting. This segmentation resolves the contradiction by enabling accurate per-TRP CSI feedback without requiring complex joint processing of multiple TRP signals.
Solution Approach 2:
The patent introduces dynamic switching capability where the terminal can switch between single-TRP CSI reporting mode and multi-TRP CSI reporting mode based on configuration. When MTRP is not configured, simple single-TRP reporting is used; when MTRP is configured, the system dynamically transitions to separate CSI reporting for each TRP. This dynamic adaptation resolves the contradiction by maintaining simplicity when MTRP is not needed while enabling performance optimization when MTRP is deployed.
2Measurement precision
If separate CSI reports for each TRP are implemented in MTRP, then accurate channel state information is obtained for each transmission point, but the complexity of CSI reporting configuration and processing increases
Solution Approach 1:
The patent designs a universal CSI reporting framework that can function in both single-TRP and multi-TRP modes. The same CSI reporting structure and processing mechanisms are used regardless of whether one or multiple TRPs are configured. This universality resolves the contradiction by achieving accurate per-TRP CSI measurement without requiring fundamentally different or more complex reporting mechanisms for MTRP scenarios.
Solution Approach 2:
The patent uses copying by replicating the CSI reporting structure for each TRP. Instead of creating a completely new complex reporting mechanism for MTRP, the system copies the existing single-TRP CSI reporting framework multiple times (once per TRP). Each copied instance is independently configured and processed, achieving accurate per-TRP CSI feedback while leveraging the simplicity of the original single-TRP reporting design.
3Productivity
If MTRP transmission is deployed without appropriate CSI reporting mechanisms, then high capacity and throughput are achieved through multiple transmission points, but communication quality degrades due to inadequate CSI feedback
Solution Approach 1:
The patent implements comprehensive feedback mechanisms where the terminal measures and reports CSI for each TRP separately to the base station. This feedback enables the base station to adjust transmission parameters (such as precoding matrices, modulation and coding schemes) for each TRP based on actual channel conditions. This feedback loop resolves the contradiction by ensuring that high-throughput MTRP transmission is supported by accurate, real-time CSI information, thereby maintaining communication quality.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes a receiving section that receives a channel state information (CSI) report configuration indicating that at least one of CSI for a single transmission/reception point (STRP) and CSI for multi-TRP (Multi TRP (MTRP)) is reported, and a control section that performs control to include, in a CSI report, at least one of the CSI for a STRP and the CSI for MTRP, based on information included in the CSI report configuration. According to an aspect of the present disclosure, even when MTRP is used, CSI measurement and report can be appropriately performed.