Terminal TCI State Mapping for Definite QCL Determination
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Solution Overview
Problem
In future radio communication systems, the information related to quasi-co-location (QCL) is often indefinite, leading to potential communication quality reduction and throughput reduction.
Innovation Solution
A terminal that includes a receiving section for processing transmission configuration indication (TCI) states and a control section to apply specific TCI states to both uplink and downlink channels, ensuring appropriate determination of QCL information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If information related to QCL is used for transmission configuration, then communication quality can be improved, but the information may be indefinite leading to communication quality reduction and throughput reduction
Solution Approach 1:
The patent introduces an intermediary mechanism where the terminal determines QCL information based on reference signals (such as SSB or CSI-RS) and spatial relations rather than directly using indefinite QCL information. This intermediary process allows the terminal to derive definite QCL parameters from measurable reference signals, thereby resolving the uncertainty of QCL information while maintaining communication quality improvements
Solution Approach 2:
The patent implements feedback mechanisms where the terminal measures reference signals, determines spatial relations, and uses this measured information to configure transmission parameters. The base station can also provide feedback through downlink control information to confirm or adjust the determined QCL information, creating a closed-loop system that ensures definiteness while optimizing communication quality
2Productivity
If QCL information is used for transmission configuration, then throughput can be improved, but indefinite QCL information causes throughput reduction
Solution Approach 1:
The patent replaces the direct use of indefinite QCL information with a measurement-based determination process. Instead of relying on potentially inaccurate QCL assumptions, the terminal uses actual measurements of reference signals (SSB, CSI-RS) to determine spatial relations and QCL parameters, substituting theoretical mechanics with empirical measurement to ensure throughput optimization
3Measurement precision
If the terminal applies TCI states to uplink and downlink, then QCL information determination is improved, but the complexity of managing multiple TCI states increases
Solution Approach 1:
The patent applies universal TCI states that can be used for both uplink and downlink transmissions. Instead of maintaining separate TCI state configurations for different directions, the terminal determines spatial relations that are applicable across multiple transmission types, reducing the overall complexity of TCI state management while maintaining precise QCL information determination
Solution Approach 2:
The patent merges the determination process for uplink and downlink QCL information into a unified spatial relation framework. By combining the configuration and management of TCI states into a single determination process based on reference signal measurements, the patent reduces the complexity of managing multiple separate TCI state configurations while improving measurement precision
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a first list and a second list of transmission configuration indication (TCI) states, and a control section that applies one first TCI state in the first list to uplink and downlink and applies one second TCI state in the second list to uplink and downlink. According to one aspect of the present disclosure, it is possible to appropriately determine information related to QCL.