Terminal TCI State Indication for Multi-TRP DL and UL
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Solution Overview
Problem
Existing radio communication systems face challenges in clearly indicating the Transmission Configuration Indication (TCI) state, leading to potential degradation in communication quality and reduction in throughput, especially in multi-TRP scenarios.
Innovation Solution
A terminal is designed with a receiving section that can receive indication information for multiple TCI states, which are then applied to both downlink and uplink signals or separate downlink and uplink signals, each associated with different physical cell IDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCI state indication is not clearly defined, then communication quality degrades and throughput reduces, but defining clear indication methods increases system complexity
Solution Approach 1:
The patent segments the TCI state indication by associating different TCI states with different Physical Cell IDs (PCIs). This allows the terminal to clearly identify which TCI state applies to which TRP through the PCI parameter in the indication information, resolving the ambiguity without requiring a completely new complex indication framework.
Solution Approach 2:
The patent introduces the PCI parameter as an intermediary element that mediates between the TCI state indication and the terminal. The PCI acts as a key that links the indication information to the correct TCI state, making the indication method clear and unambiguous while maintaining manageable system complexity.
2Reliability
If multiple TCI states are applied to multi-TRP signals, then communication quality improves, but the difficulty of detecting and measuring TCI states increases
Solution Approach 1:
The patent uses PCI as a distinctive identifier (analogous to a color code) for each TCI state. The terminal can easily detect and measure the correct TCI state by identifying the associated PCI in the indication information, transforming a complex detection problem into a simple identifier matching process.
3Adaptability or versatility
If separate TCI states are defined for DL and UL signals, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent creates a universal TCI state framework where a single TCI state can be applied to both DL and UL signals. The indication information includes a parameter indicating whether the TCI state applies to DL, UL, or both, providing adaptability without requiring separate complex management systems for different signal types.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes a receiving section that receives indication information of a plurality of transmission configuration indication (TCI) states to apply to a plurality of signals, and a control section that applies the plurality of TCI states respectively to signals based on the indication information, the signals being transmitted/received to/from a plurality of transmission/reception points (TRPs), wherein each of the plurality of TCI states is a TCI state to apply to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state to apply to a DL signal and a TCI state to apply to a UL signal, and the plurality of TCI states are respectively associated with different physical cell IDs (PCIs). According to one aspect of the present disclosure, it is possible to appropriately perform TCI state indication.