Terminal TCI State Selection for Short-Offset Downlink Scheduling
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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 determine a TCI state based on specific DCI fields when the offset from reception of DCI to the DL signal is less than a threshold value, enabling appropriate application of TCI states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a TCI state indication method is not clearly defined for cases with small offset values, then the system maintains flexibility in implementation, but communication quality degrades and throughput is reduced
Solution Approach 1:
The patent applies parameter changes by introducing a threshold value for the offset between DCI reception and DL signal reception. When the offset is smaller than the threshold, a specific codepoint in the DCI field indicates a specific TCI state to be applied. This parameter-based approach (threshold comparison) provides a clear, deterministic method for TCI state application in short-offset scenarios, resolving the ambiguity that previously caused communication quality degradation.
2Productivity
If a specific TCI state application method is implemented for small offset values, then communication quality improves, but the system requires additional threshold configuration and decision logic
Solution Approach 1:
The patent uses parameter changes (threshold value) to trigger different TCI state application behaviors. The control section compares the offset parameter against the threshold and applies the appropriate TCI state indication method accordingly. This parameter-driven approach enables improved throughput through clear TCI state application while keeping the complexity increase minimal and manageable.
3Productivity
If the offset from DCI reception to DL signal reception is small, then scheduling efficiency improves, but TCI state determination becomes ambiguous without specific rules
Solution Approach 1:
The patent applies preliminary action by pre-defining the threshold value and the corresponding TCI state indication rules before actual scheduling occurs. The system prepares the decision logic in advance, so when a small-offset scheduling scenario arises, the TCI state can be determined immediately using the pre-established rules. This eliminates ambiguity and ensures clear TCI state indication while maintaining high scheduling efficiency.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives first downlink control information (DCI) for indicating one or more unified Transmission Configuration Indications (TCI states), second DCI, and a downlink (DL) signal scheduled or triggered by using the second DCI, and a control section that determines a TCI state to apply to the DL signal, based on a specific codepoint indicated by a specific field included in the second DCI, when an offset from reception of the DCI to reception of the DL signal is smaller than a specific threshold value. According to one aspect of the present disclosure, it is possible to appropriately apply a TCI state(s).