Terminal TCI State Indication for Downlink Reception Control
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Solution Overview
Problem
The application of Transmission Configuration Indication (TCI) states in future radio communication systems is not clear, leading to potential degradation in communication quality and throughput reduction.
Innovation Solution
A terminal and base station that include a receiving section and a control section to determine a unified TCI state based on downlink control information (DCI) for appropriate application of TCI states to downlink channels and reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a unified TCI state is indicated by DCI for multiple DL channels and reference signals, then communication quality and throughput are improved, but the method of applying TCI states is not clear leading to implementation complexity
Solution Approach 1:
The patent segments the TCI state application by introducing a specific field in DCI that explicitly indicates which TCI state should be applied to which DL channel or reference signal. This segmentation resolves the ambiguity by dividing the indication process into discrete, clearly defined components rather than attempting a unified indication method for all channels.
Solution Approach 2:
The patent applies local quality by allowing different TCI states to be indicated for different DL channels and reference signals through the specific DCI field. Each channel or reference signal can have its own TCI state indication, enabling localized optimization of reception parameters rather than applying a single TCI state uniformly across all channels.
2Reliability
If TCI state indication method is not clear, then communication quality degradation occurs, but defining clear indication methods increases system complexity
Solution Approach 1:
The patent implements preliminary action by pre-defining the structure and format of the TCI state indication field in DCI through higher-layer configuration. The indication method is established in advance with clear rules for how the field maps to specific TCI states, eliminating ambiguity during actual operation without requiring complex runtime decision-making.
Solution Approach 2:
The patent introduces an intermediary mechanism through the specific field in DCI that serves as a mediator between the base station's TCI state selection and the terminal's reception parameter configuration. This intermediary field provides a clear, standardized interface that simplifies the indication process while maintaining flexibility in TCI state application.
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 downlink (DL) channel and a DL reference signal scheduled or triggered by downlink control information (DCI), and a control section that determines, based on a unified Transmission Configuration Indication (TCI state) indicated by a specific field included in the DCI, an indicated TCI state to be applied to reception of the DL channel or the DL reference signal. According to one aspect of the present disclosure, it is possible to appropriately apply a TCI state(s).