TCI State Mapping for Multi-TRP PDCCH Search Space Sets
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Solution Overview
Problem
In New Radio (NR) wireless communication systems using very high frequency bands, determining the transmission configuration indicator (TCI) states for multiple transmission and reception points (TRPs) to ensure effective beam-based transmission and reception is challenging, particularly when multiple physical downlink control channels (PDCCHs) are sent by different TRPs, as existing methods do not adequately address how to indicate TCI states for search space sets.
Innovation Solution
A method and apparatus for determining TCI states in a terminal and network device, involving explicit or implicit signaling to indicate N TCI states corresponding to search space sets, allowing terminals to correctly receive downlink control information (DCI) by configuring TCI states for multiple TRPs, thereby improving decoding success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs are used to send PDCCH to the terminal, then the reliability of downlink control information transmission is improved, but the complexity of indicating TCI states for search space sets increases
Solution Approach 1:
The patent segments the TCI state indication by associating each search space set with specific TCI states through dedicated configuration parameters. This allows different search space sets to be independently configured with appropriate TCI states, resolving the complexity of managing multiple TRPs while maintaining reliability.
Solution Approach 2:
The patent applies preliminary action by pre-configuring TCI states for search space sets before PDCCH transmission. The network device configures the terminal with TCI state mappings in advance, so that when multiple TRPs transmit PDCCH, the terminal already has the necessary TCI state information ready, reducing the complexity of real-time indication while ensuring reliable reception.
2Adaptability or versatility
If TCI states are configured for multiple TRPs, then the adaptability of beam-based transmission is improved, but the difficulty of determining TCI states for search space sets increases
Solution Approach 1:
The patent applies local quality by allowing different search space sets to have different TCI state configurations tailored to their specific requirements. Each search space set can be associated with specific TCI states that are appropriate for its function and the corresponding TRP, enabling localized optimization without requiring complex global determination mechanisms.
Solution Approach 2:
The patent introduces an intermediary mechanism through the configuration of search space set parameters that link to TCI states. This intermediary layer simplifies the determination process by providing a clear mapping relationship between search space sets and TCI states, reducing the difficulty of determining appropriate TCI states for multiple TRPs while maintaining high adaptability.
Data Source
AI summary
A transmission configuration indicator (TCI) state determination method and apparatus includes receiving an indication signaling; and determining, according to the indication signaling, N TCI states corresponding to a search space set of the terminal, N being a positive integer by reading a configuration of the search space set from the indication signaling, including TCI state identifiers of the N TCI states corresponding to the search space set.