Type-II-CJT CSI Parameter Configuration for Multi-TRP Reporting
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel state information (CSI) acquisition and reporting, particularly in multiple TRP scenarios, leading to increased report size and overhead, especially in low-frequency bands with distributed TRPs.
Innovation Solution
The UE is configured to transmit and receive information about the number of spatial domain (SD) bases for each TRP, independent of frequency domain (FD) bases and maximum non-zero coefficients (NZCs, to facilitate improved CSI reporting for coherent joint transmissions (CJT) across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional CSI reporting methods are used in multiple TRP scenarios, then CSI acquisition is achieved, but report size and overhead increase significantly
Solution Approach 1:
The patent segments the CSI reporting process by introducing separate indication fields for different TRPs. Each TRP's CSI information is independently indicated through separate fields (e.g., first indication field for first TRP, second indication field for second TRP), allowing selective reporting of only necessary TRP information and reducing overall report size while maintaining completeness.
Solution Approach 2:
The patent implements dynamic CSI reporting by allowing the UE to determine the number of spatial domain bases (L) for each TRP independently. The indication fields can have different sizes depending on the actual TRP configuration and channel conditions, enabling adaptive reporting that minimizes overhead while ensuring complete CSI acquisition.
2Reliability
If distributed TRPs are deployed in low-frequency bands, then coverage and capacity are improved, but system complexity increases
Solution Approach 1:
The patent applies segmentation to the CSI reporting structure by dividing the report into separate indication fields for each TRP. This allows the system to manage distributed TRPs independently through modular fields, reducing the complexity of processing and interpreting the overall CSI report while maintaining the benefits of distributed deployment.
Solution Approach 2:
The patent implements local quality by allowing each TRP to have its own specific indication field with parameters tailored to that TRP's channel conditions. Each TRP's CSI information is independently optimized and reported, enabling the system to handle the complexity of distributed TRPs through localized parameter configurations rather than a monolithic approach.
3Measurement precision
If the number of spatial domain bases is increased for each TRP, then CSI reporting precision is improved, but overhead increases
Solution Approach 1:
The patent implements dynamic adjustment of the number of spatial domain bases (L) for each TRP based on actual channel conditions and reporting requirements. The indication fields can adapt their size and content dynamically, allowing the system to increase precision for TRPs that require it while minimizing overhead for TRPs with simpler channel characteristics.
Solution Approach 2:
The patent applies parameter changes by allowing the number of spatial domain bases (L) to vary for different TRPs and different reporting scenarios. The system can adjust this parameter dynamically based on channel conditions, user requirements, and overhead constraints, optimizing the balance between CSI reporting precision and overhead for each specific case.
Data Source
AI summary
In a first configuration, a UE is configured to transmit information indicating a number of SD bases for each TRP of a set of TRPs. In addition, the UE is configured to receive a downlink communication from at least a subset of TRPs of the set of TRPs based on the transmitted information. In a second configuration, a UE is configured to receive information indicating a number of SD bases for each TRP of a set of TRPs. The received information is unassociated with a first parameter indicating a number of FD bases and a second parameter indicating a maximum number of NZCs. In addition, the UE is configured to transmit a CSI report based on the received information.