TCI State Selection Across Channels for Consistent DCI Signaling
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Solution Overview
Problem
In communication systems, there is a need to ensure consistency in Transmission Configuration Indication (TCI) state adoption between terminals and network devices when multiple sets of TCI states are indicated by single Downlink Control Information (DCI) to maintain reliable transmission.
Innovation Solution
A method for determining TCI states by terminals and network devices based on channel configuration, number of TCI states, and channel type to ensure consistency in TCI state adoption, using methods such as MAC control elements and DCI to activate TCI states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a unified TCI state is used to perform uplink and downlink separate indication or joint indication, then signaling overhead is reduced, but it becomes difficult for the terminal to determine the correct TCI state when multiple sets are configured
Solution Approach 1:
The patent applies local quality by making different channels and signals use different TCI state determination rules based on their specific characteristics. Downlink channels (PDSCH, PDCCH) use one set of rules while uplink channels (PUSCH, PUCCH) use another set, allowing each to be optimized for its specific requirements while using the same DCI format
Solution Approach 2:
The patent introduces an intermediary mechanism through specific DCI fields and determination rules that act as mediators between the unified TCI state indication and the channel-specific requirements. The DCI format 1_1 and 0_1 with specific field configurations serve as intermediaries that resolve the conflict between unified indication and channel-specific needs
2Productivity
If single DCI is configured to indicate at least one set of TCI states, then signaling efficiency is improved, but the terminal faces difficulty in determining which TCI state to use for channels configured with multiple TCI states
Solution Approach 1:
The patent applies dynamics by making the TCI state determination process adaptive rather than static. The terminal dynamically selects which TCI state to use based on the channel type, configuration, and number of states indicated, allowing the system to flexibly handle different scenarios while maintaining consistent determination rules
Solution Approach 2:
The patent uses parameter changes by varying the TCI state selection based on different parameters such as channel type (downlink vs uplink), configuration (separate vs joint indication), and the number of TCI states indicated. This allows a single DCI to reliably indicate appropriate TCI states for different channels by changing the interpretation parameters
Data Source
AI summary
A method for determining a transmission configuration indication (TCI) state is performed by a terminal. The method includes: receiving indication information, wherein the indication information is configured to indicate at least one set of TCI states; and determining a TCI state for transmission of a channel or a signal according to at least one of a configuration for the channel or the signal, a number of TCI states indicated in the indication information, or a channel type.