Terminal TCI State Handling Across CORESET Pools
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Solution Overview
Problem
The application of Transmission Configuration Indication (TCI) states in future radio communication systems is unclear, leading to potential degradation in communication quality and throughput reduction.
Innovation Solution
A terminal and base station are designed to apply a unified TCI state to both a first and second control resource set pool index, enabling appropriate application of TCI states to downlink signals scheduled or triggered by different control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a unified TCI state is indicated for multiple control resource set pool indexes, then the complexity of TCI state management is reduced, but it becomes unclear how to apply the TCI state to different downlink signals, leading to communication quality degradation
Solution Approach 1:
The patent applies different TCI state application rules to different downlink signal types. Specifically, when a unified TCI state is indicated, the terminal applies it differently depending on the signal type: for PDSCH, it applies the TCI state corresponding to the CORESET pool index of the scheduling DCI, while for PDCCH, it applies the TCI state corresponding to the CORESET pool index of the PDCCH. This local differentiation resolves the ambiguity while maintaining overall system simplicity.
2Reliability
If separate TCI states are applied to different control resource set pool indexes, then communication quality is maintained, but the device complexity and difficulty of TCI state application increase
Solution Approach 1:
The patent creates a universal TCI state application mechanism that works across different signal types and CORESET pool index configurations. The terminal determines which TCI state to apply based on the signal type and CORESET pool index association, providing a unified approach that simplifies implementation while maintaining appropriate quality of service for different signals.
3Adaptability or versatility
If the method of applying TCI state is not clearly defined, then flexibility in system design is maintained, but throughput reduction and communication quality degradation occur
Solution Approach 1:
The patent introduces dynamic TCI state selection based on the type of downlink signal being received. The terminal dynamically determines the appropriate TCI state application rule according to whether the signal is PDSCH, PDCCH, or other types, and according to the CORESET pool index associations. This dynamic approach ensures optimal throughput for different signal types while maintaining clear application rules.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A terminal according to one aspect of the present disclosure includes: a receiving section that receives at least one of a first downlink (DL) signal scheduled or triggered by first downlink control information (DCI) corresponding to a first control resource set pool index and a second downlink (DL) signal scheduled or triggered by second downlink control information (DCI) corresponding to a second control resource set pool index; and a control section that applies, when one unified Transmission Configuration Indication (TCI state) is indicated for each of the first control resource set pool index and the second control resource set pool index, both a first TCI state corresponding to the first control resource set pool index and a second TCI state corresponding to the second control resource set pool index or one of the first TCI state and the second TCI state, to the first DL signal or the second DL signal.