Terminal TCI State Application for QCL Determination
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Solution Overview
Problem
In future radio communication systems, such as 5G and beyond, the indeterminacy of quasi-co-location (QCL) information leads to reduced communication quality and throughput, necessitating a method to appropriately determine QCL-related information.
Innovation Solution
A terminal equipped with a receiving section for TCI lists and update lists, and a control section that applies TCI states to multiple types of channels across serving cells, enabling precise determination and application of TCI states for improved QCL management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If QCL information is not definitively determined, then the system maintains flexibility in channel configuration, but communication quality and throughput are reduced
Solution Approach 1:
The base station performs preliminary action by pre-configuring TCI lists and update lists through higher-layer signaling before actual channel transmission. This allows the terminal to have TCI states ready in advance, eliminating the need for complex real-time QCL determination and ensuring reliable communication quality from the start of channel transmission.
Solution Approach 2:
TCI states serve as an intermediary that bridges the base station and terminal for QCL information exchange. The TCI list and update list act as structured intermediaries that carry QCL information through higher-layer signaling, simplifying the determination process while ensuring reliable communication quality through standardized information transmission.
2Measurement precision
If TCI states are applied to multiple types of channels across multiple serving cells, then QCL information accuracy is improved, but the complexity of channel configuration increases
Solution Approach 1:
The TCI state mechanism is designed with universality to serve multiple types of channels (downlink and uplink channels) across multiple serving cells simultaneously. A single TCI state can be applied to various channel types, reducing the need for separate QCL configurations for each channel and thereby improving QCL information accuracy without proportionally increasing configuration complexity.
Solution Approach 2:
The system uses parameter changes through update lists that indicate changes in TCI states for specific serving cells. Instead of reconfiguring all parameters for all cells, only the changed TCI state parameters are updated through the update list, maintaining high QCL information accuracy while reducing the overall configuration complexity through selective parameter updates.
3Productivity
If indefinite QCL information is used, then the system allows for flexible channel management, but throughput is reduced
Solution Approach 1:
The update list mechanism provides feedback from the base station to the terminal about changes in TCI states. This feedback ensures that the terminal always has the most current and definite QCL information, eliminating information loss and enabling high throughput by ensuring accurate QCL determination for all channel transmissions.
Solution Approach 2:
TCI lists are pre-configured with complete TCI state information before channel transmission begins. This preliminary action ensures that definite QCL information is available in advance, preventing information loss and enabling high throughput by eliminating the need for complex real-time QCL determination during data transmission.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a TCI list indicating a plurality of transmission configuration indication (TCI) states applicable to multiple types of channels, that receives an update list indicating a plurality of serving cells, and that receives indication information to indicate one or more TCI states out of the plurality of TCI states in one of the plurality of serving cells, and a control section that applies the one or more TCI states to the multiple types of channels in the plurality of serving cells. According to one aspect of the present disclosure, it is possible to appropriately determine information related to QCL.