Terminal TCI State QCL Parameter Selection for Multi-TRP Reception
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Solution Overview
Problem
In future radio communication systems, particularly in high-speed scenarios like those involving moving objects, the reception of downlink signals from multiple transmission points is not adequately addressed, leading to potential throughput reductions.
Innovation Solution
A terminal equipped with a receiving section that processes information on transmission configuration indications (TCI) for physical downlink shared channels, selectively applying specific quasi co-location (QCL) parameters to appropriately receive signals from multiple transmission points, ensuring optimal signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink signals are transmitted from multiple transmission points to high-speed moving objects, then communication coverage and reliability are improved, but signal reception accuracy deteriorates due to insufficient clarification of reception operations
Solution Approach 1:
The patent segments the reception processing by separating handling of TCI states based on whether they indicate one or two TRPs. The control section applies different reception processing methods: for two-TRP TCI states, it selectively applies QCL parameters from specific TCI states, while for one-TRP TCI states, it uses conventional reception processing. This segmentation resolves the contradiction by enabling reliable multi-TRP communication without compromising reception accuracy.
Solution Approach 2:
The patent applies local quality by using different reception processing strategies for different TCI states. Specifically, when a TCI state indicates two TRPs, the control section applies QCL parameters only from the first or second TCI state (not both), whereas conventional processing applies QCL parameters from all indicated TCI states. This localized adaptation ensures accurate signal reception for each TRP configuration.
2Loss of information
If all QCL parameters from multiple TCI states are applied to PDSCH reception, then comprehensive signal information is obtained, but reception processing complexity increases and throughput decreases
Solution Approach 1:
The patent extracts only the necessary QCL parameters for effective reception. When a TCI state indicates two TRPs, the control section extracts QCL parameters from only one of the two TCI states (either the first or second, based on configuration), rather than applying all parameters from both TCI states. This extraction approach maintains signal information completeness while reducing processing complexity and improving throughput.
Solution Approach 2:
The patent applies partial action by selectively applying QCL parameters from specific TCI states rather than all available TCI states. For two-TRP configurations, it applies parameters from one TCI state sufficiency for reception, avoiding the excessive processing that would result from applying all parameters from multiple TCI states, thereby improving throughput while maintaining reception quality.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives information indicating two transmission configuration indication (TCI) states for a physical downlink shared channel (PDSCH), and a control section that does not apply a first quasi co-location (QCL) parameter in a plurality of QCL parameters included in a specific TCI state in the two TCI states to reception of the PDSCH, and applies a second QCL parameter other than the first QCL parameter in the plurality of QCL parameters to the reception of the PDSCH. According to one aspect of the present disclosure, downlink signals from a plurality of transmission points can be appropriately received.