Joint TCI State Selection for Multi-TRP Uplink Transmission
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Solution Overview
Problem
In MIMO systems with ideal backhaul connections, the challenge lies in determining which joint TCI states can be used for uplink channels and signals, particularly when QCL Type A and Type B information cannot be utilized for the UL Tx spatial filter, affecting transmission performance.
Innovation Solution
A method for terminals to receive indication information and determine whether joint TCI states are applicable for uplink channels and signals, considering factors like QCL types and frequency ranges, allowing for improved transmission performance in multi-TRP coherent joint transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If joint TCI states are indicated for multi-TRP transmission, then transmission diversity is improved, but it becomes difficult to determine which states are suitable for uplink channels and signals
Solution Approach 1:
The patent introduces a feedback mechanism where the terminal device feeds back information about suitable joint TCI states to the network device. This feedback loop enables the network to understand which TCI states are appropriate for uplink transmission, resolving the determination difficulty while maintaining transmission diversity benefits
Solution Approach 2:
The patent uses indication information as an intermediary element that carries TCI state details between the network device and terminal device. This intermediary structure facilitates the determination process by providing structured information about which joint TCI states are suitable for uplink channels and signals
2Reliability
If QCL Type A and Type B information are used for spatial filter, then transmission performance is improved, but compatibility with uplink channels is reduced
Solution Approach 1:
The patent applies local quality by differentiating the usage of QCL Type A and Type B information for different channels. It determines that QCL Type A information can be used for downlink channels while QCL Type B information is suitable for uplink channels, allowing optimized performance for each specific channel type rather than universal application
Solution Approach 2:
The patent segments the TCI state information into different categories (QCL Type A and Type B) with distinct applicability rules. This segmentation allows the system to selectively apply the appropriate QCL type to the appropriate channel, resolving the conflict between performance optimization and uplink compatibility
Data Source
AI summary
A method for determining information, a communication apparatus and a storage medium are provided. The method is performed by a terminal, and includes: receiving indication information, in which the indication information indicates at least one joint transmission configuration indicator (TCI) state; and determining whether the at least one joint TCI state is used for a transmission of an uplink channel and/or an uplink signal.