Channel-Specific TCI State Selection for Reliable Uplink and Downlink
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Solution Overview
Problem
In communication systems, determining a unified Transmission Configuration Indication (TCI) state for both downlink and uplink transmissions to ensure consistency between terminals and network devices is challenging, leading to potential transmission reliability issues.
Innovation Solution
A method and apparatus for determining TCI states by receiving and sending indication information to align terminal and network device understanding, using configurations for channels and signals to ensure consistent TCI states for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a unified TCI state is used for downlink and uplink indication, then signaling overhead is reduced, but transmission reliability deteriorates due to potential misunderstanding between terminal and network device
Solution Approach 1:
The patent applies local quality by differentiating TCI state determination based on channel type. For downlink channels (PDSCH, PDCCH), the terminal determines TCI states based on downlink signal configurations, while for uplink channels (PUSCH, PUCCH), the terminal determines TCI states based on uplink signal configurations and received downlink TCI states. This localized differentiation ensures each channel type uses appropriate TCI states for its specific transmission characteristics, resolving the reliability issue while maintaining unified indication efficiency.
Solution Approach 2:
The patent segments the TCI state indication process into distinct determination methods for different channel types. The terminal segments the handling of multiple TCI state sets by applying specific selection rules for downlink channels versus uplink channels, ensuring that each channel type receives the appropriate TCI state from the indicated sets based on its configuration and requirements.
2Adaptability or versatility
If multiple sets of TCI states are indicated through DCI, then adaptability is improved, but device complexity increases due to the need to determine which set to use
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI state sets with distinct identities before transmission. The network device prepares multiple sets of TCI states in advance, each set containing pre-defined TCI states suitable for different channel types and transmission scenarios. This preliminary preparation allows the terminal to efficiently select from pre-organized sets rather than processing raw configuration data, reducing terminal complexity while maintaining adaptability.
Solution Approach 2:
The patent introduces an intermediary mechanism through the use of TCI state set identities as mediators between the network device's indication and the terminal's selection. The set identities act as intermediaries that simplify the terminal's determination process by providing clear identifiers for different TCI state collections, enabling the terminal to efficiently map indicated sets to appropriate channels without complex processing.
Data Source
AI summary
A method for determining a transmission configuration indication (TCI) state is performed by a terminal. The method includes: receiving first indication information, wherein the first indication information is configured to indicate at least two sets of TCI states; and determining, according to a configuration for at least one of a channel or a signal, a TCI state for a transmission of the at least one of the channel or the signal.