Terminal Device TCI State Determination in Multi-TRP Scenarios
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Solution Overview
Problem
In multiple-transmission and reception point (multi-TRP) scenarios of 3GPP Release 17, terminal devices face challenges in determining the appropriate transmission configuration indicator (TCI) state for beam, path loss reference signal (PL-RS), and quasi co-location (QCL) assumption due to multiple CORESETs and TCI states, affecting information interaction with network devices.
Innovation Solution
The method involves receiving higher-layer configuration information, determining N CORESETs and their TCI states, selecting a target CORESET, and identifying a target TCI state to determine the necessary beam, PL-RS, and QCL assumption, facilitating effective channel and reference signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple CORESETs with multiple TCI states are configured in multi-TRP scenario, then the terminal device can receive more comprehensive configuration information, but it becomes difficult to determine the appropriate TCI state for beam, PL-RS, and QCL assumption
Solution Approach 1:
The patent introduces a mapping relationship as an intermediary between CORESETs and TCI states. This mapping relationship serves as a mediator that guides the terminal device in determining the appropriate TCI state for a given CORESET, resolving the complexity of directly handling multiple TCI states without clear determination rules.
Solution Approach 2:
The patent segments the determination process into distinct steps: first identifying the CORESET, then using the mapping relationship to determine the corresponding TCI state. This segmentation breaks down the complex task of selecting from multiple TCI states into a systematic, manageable process.
2Adaptability or versatility
If multiple TCI states are provided for each CORESET, then more transmission configuration options are available, but the complexity of determining the target TCI state increases
Solution Approach 1:
The mapping relationship acts as an intermediary that simplifies the determination process. Instead of directly handling multiple TCI states with unclear selection criteria, the system uses the mapping relationship as a mediator that provides clear correspondence between CORESETs and TCI states, reducing device complexity.
Solution Approach 2:
The mapping relationship is pre-configured before the terminal device needs to determine TCI states. This preliminary action of establishing the mapping relationship in advance eliminates the need for complex real-time determination logic, as the correspondence is already prepared and available for direct lookup.
3Adaptability or versatility
If the terminal device determines TCI state based on multiple CORESETs, then more configuration flexibility is achieved, but information interaction efficiency with network device deteriorates
Solution Approach 1:
The mapping relationship serves as an intermediary that enables efficient information interaction. By establishing a clear correspondence between CORESETs and TCI states through this mapping, the terminal device can quickly determine the appropriate TCI state without requiring extensive back-and-forth communication with the network device, thus maintaining flexibility while improving efficiency.
Data Source
AI summary
A method for transmission configuration indicator (TCI) state determination is provided. The method includes the following. Receive higher-layer configuration information. Determine N control resource sets (CORESETs) and at least one TCI state of each of the N CORESETs based on the higher-layer configuration information. Determine a target CORESET from the N CORESETs; and determine a target TCI state from at least one TCI state of the target CORESET.