Terminal TCI State Control for Multi-TRP Communication
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Solution Overview
Problem
In future radio communication systems, controlling downlink signal reception and uplink signal transmission across multiple cells is challenging, particularly when dealing with multiple transmission/reception points (TRPs) and varying active transmission configuration indication (TCI) states.
Innovation Solution
A terminal is equipped with a receiving section that indicates active TCI states and a control section that manages the reception of downlink channels based on the number of active TCI states and physical cell IDs, ensuring appropriate communication even with multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If communication is performed using multiple cells or multiple TRPs, then communication capacity and reliability are improved, but control complexity for DL signal reception and UL signal transmission increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the number of active TCI states based on the serving cell index. When the serving cell index is less than a threshold, only one TCI state is activated; when the threshold is exceeded, multiple TCI states are activated. This parameter-based control mechanism resolves the contradiction by adapting system complexity to actual communication needs, improving reliability only when necessary while minimizing control complexity in normal operation.
2Productivity
If multiple TCI states are activated for multi-TRP communication, then communication capacity increases, but the difficulty of controlling DL signal reception and UL signal transmission increases
Solution Approach 1:
The patent implements dynamics by making TCI state activation dynamic rather than static. The number of active TCI states changes based on the serving cell index threshold condition. This dynamic approach allows the system to scale communication capacity from one TRP to multiple TRPs as needed, while the control difficulty remains manageable because the activation rule is simple and automatic, avoiding the need for complex manual configuration.
3Adaptability or versatility
If the number of active TCI states is increased, then support for multiple transmission points improves, but system complexity for managing TCI states and PCIs increases
Solution Approach 1:
The patent applies segmentation by dividing the TCI state management into distinct segments based on the serving cell index. When the index is below the threshold, one TCI state segment is used; when above, multiple TCI state segments are used. This segmentation approach improves adaptability to different multi-TRP scenarios while reducing system complexity by creating clear, manageable segments rather than requiring unified complex management for all cases.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives an indication of one or more active transmission configuration indication (TCI) states, and a control section that controls, based on the number of the one or more active TCI states and a physical cell ID (PCI) associated with one TCI state of the one or more active TCI states, reception of a first downlink channel for at least one of paging, a short message, and system information. The first downlink channel is present in a control resource set with index 0. According to one aspect of the present disclosure, it is possible to appropriately perform communication even when communication is performed by using a plurality of transmission points.