Multi-TRP PDCCH Scheduling With TCI State Selection Rules
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Solution Overview
Problem
In wireless communication systems, determining the TCI state for channels or signals scheduled by multiple PDCCH transmissions is challenging, particularly in scenarios involving multiple transmission receive points (TRPs) and different TCI states.
Innovation Solution
A method for determining the TCI state of a scheduled channel or signal based on first DCI and time intervals between PDCCH and the channel or signal, using multiple TCI states to schedule the same channel or signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PDCCH transmissions use multiple TCI states to schedule the same channel or signal, then communication reliability is improved through diversity, but determining the correct TCI state for the scheduled channel becomes complex and ambiguous
Solution Approach 1:
The patent applies preliminary action by pre-configuring TCI state sets for different PDCCH formats and establishing predetermined rules for TCI state selection. The terminal device is configured with multiple TCI state sets in advance, and specific rules are defined for selecting which set to use based on PDCCH format and other parameters, eliminating the need for complex real-time determination
Solution Approach 2:
The patent changes parameters by introducing multiple TCI state sets with different configurations, and dynamically selecting among them based on PDCCH format, search space set, and other parameters. This allows the system to adapt the TCI state selection process to different transmission scenarios, resolving the ambiguity while maintaining reliability
2Adaptability or versatility
If multiple PDCCH transmissions according to multiple TCI states are used to schedule the same channel, then adaptability to different transmission scenarios is improved, but the difficulty of determining the appropriate TCI state increases
Solution Approach 1:
The patent applies segmentation by dividing TCI states into multiple distinct sets, each optimized for specific PDCCH formats or transmission scenarios. This segmentation allows the terminal to select from predefined groups rather than evaluating all possible TCI states, reducing detection difficulty while maintaining adaptability
Solution Approach 2:
The patent introduces intermediary elements such as search space set associations and PDCCH format indicators that mediate between the multiple TCI state sets and the final TCI state selection. These intermediaries provide structured guidance for TCI state determination, reducing the complexity of direct selection while preserving adaptability
Data Source
AI summary
Embodiments of the present application provide a wireless communication method, a terminal device, and a network device. The method comprises: the terminal device receives at least one PDCCH sent by the network device according to a plurality of TCI states, the at least one PDCCH being used for scheduling a same first channel or a same first signal; the terminal device determines a TCI state of the first channel or the first signal according to information of a first DCI carried on the at least one PDCCH and at least one time interval between the at least one PDCCH and the first channel or the first signal. Accordingly, provided is a method for determining the TCI state of the scheduled channel or signal in the case of sending the at least one PDCCH according to the plurality of TCI states.