Terminal TCI State Management for Multi-Cell 5G Networks
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Solution Overview
Problem
Current radio communication systems, particularly in next-generation mobile communication systems like 5G, face challenges in determining appropriate Transmission Configuration Indication (TCI) states and pathloss reference signal (PL-RS)/transmission power control (TPC) parameters for multiple cells and component carriers, leading to potential communication quality and throughput reductions.
Innovation Solution
A terminal and radio communication method that includes a receiving section for TCI state lists and a control section to apply these states across multiple cells, utilizing a unified or common TCI framework to manage TCI states and PL-RS/TPC parameters, ensuring appropriate configuration for multiple cells and component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a TCI state is applied to multiple types of signals (channels/RSs) across multiple cells/component carriers, then communication capacity and system advancement are improved, but determination accuracy of TCI state/PL-RS/TPC parameter deteriorates
Solution Approach 1:
The patent segments the determination process by introducing cell-specific indication mechanisms. Each cell or component carrier is assigned its own TCI state list and PL-RS/TPC parameter configuration, allowing independent and accurate determination for each cell while maintaining overall system capacity through multi-cell support.
2Device complexity
If inappropriate determination method is used for TCI state/PL-RS/TPC parameter in multiple cells/CCs, then device complexity is reduced, but communication quality and throughput deteriorate
Solution Approach 1:
The patent implements preliminary action by pre-configuring TCI state lists and associating them with specific cells and component carriers before actual transmission. The base station prepares cell-specific TCI indications and PL-RS/TPC parameter mappings in advance, ensuring that when transmission occurs, the terminal can quickly and accurately determine the appropriate parameters without complex real-time calculations, thus maintaining both low complexity and high communication quality.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives one or more transmission configuration indication (TCI) state lists for downlink and uplink in one or more cells of a plurality of cells and that receives an indication of one or more TCI states in the one or more TCI state lists, and a control section that applies the one or more TCI states to a part or all of the plurality of cells. According to one aspect of the present disclosure, it is possible to appropriately determine a TCI state/PL-RS/TPC parameter for a plurality of cells/CCs.