Terminal TCI State Control for PDSCH Reception
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Solution Overview
Problem
Current radio communication systems, particularly in next-generation mobile communication systems like 5G, face challenges in effectively managing the transmission configuration indication (TCI) state, leading to degradation in communication quality and throughput, especially during high-speed movements and when Doppler compensation is applied.
Innovation Solution
A terminal is equipped with a control section that determines the TCI state for a physical downlink shared channel (PDSCH) based on factors such as Doppler pre-compensation, frequency range, and the timing offset between downlink control information reception and PDSCH reception, allowing for appropriate TCI state management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCI state application is not sufficiently studied and controlled, then system complexity is reduced, but communication quality degrades and throughput reduces
Solution Approach 1:
The patent applies parameter changes by dynamically selecting TCI states based on Doppler pre-compensation status, frequency range, and timing offset conditions. The control section changes the TCI state parameters adaptively according to these conditions, resolving the contradiction by implementing structured parameter management that improves communication quality without excessive complexity
Solution Approach 2:
The patent implements dynamics by making the TCI state selection dynamic rather than static. The control section determines appropriate TCI states based on real-time conditions including Doppler pre-compensation application, frequency range, and timing relationships, allowing the system to adapt to changing communication conditions while maintaining manageable complexity through structured decision logic
2Speed
If Doppler pre-compensation is applied and TCI state is not properly managed, then high-speed movement capability is improved, but communication reliability degrades
Solution Approach 1:
The patent applies parameter changes by selecting different TCI states based on whether Doppler pre-compensation is applied. When Doppler pre-compensation is used for high-speed movement, the control section identifies appropriate TCI states that account for the compensated Doppler effects, thereby maintaining communication reliability while enabling high-speed movement capability
Solution Approach 2:
The patent applies preliminary action by determining the appropriate TCI state in advance based on the Doppler pre-compensation status before PDSCH reception. The control section proactively selects the correct TCI state considering the Doppler compensation conditions, ensuring communication reliability is maintained before the actual high-speed data transmission occurs
3Productivity
If TCI state selection is made without considering timing offset conditions, then device operation is simplified, but throughput reduces
Solution Approach 1:
The patent applies parameter changes by selecting TCI states based on the timing offset condition between DCI reception and PDSCH reception. The control section compares the timing offset against a threshold and selects appropriate TCI states accordingly, improving throughput through optimized parameter selection while maintaining reasonable determination complexity through clear conditional logic
Solution Approach 2:
The patent implements dynamics by making TCI state selection dependent on the timing offset condition. The control section dynamically adjusts TCI state choice based on whether the timing offset exceeds a threshold, allowing the system to optimize throughput under different timing conditions while keeping the determination process manageable through structured conditional decision-making
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a control section that determines a transmission configuration indication (TCI) state to apply to a physical downlink shared channel (PDSCH), based on at least one of whether Doppler pre-compensation is applied to the PDSCH, a frequency range, a magnitude relation between an offset from reception of downlink control information (DCI) for scheduling the PDSCH to reception of the PDSCH and a threshold value, and the DCI; and a receiving section that receives the PDSCH by using the TCI state. According to one aspect of the present disclosure, operation related to a TCI state/default TCI state can be appropriately controlled.