Terminal Uplink Timing Control for TRP-Specific TCI States
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Solution Overview
Problem
In future radio communication systems, the application of Transmission Configuration Indication (TCI) states is often indefinite, leading to potential degradation in communication quality and throughput reduction.
Innovation Solution
A terminal and base station that receive downlink control information (DCI) to determine a unified transmission configuration indication (TCI) state, applying different timing advances for UL transmissions associated with different TRP indices or control resource set pool indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a unified TCI state is applied to multiple signal types, then communication efficiency is improved, but the method for applying the TCI state becomes indefinite leading to quality degradation
Solution Approach 1:
The patent segments the application of TCI states by introducing separate timing advance values for different TRP indices and control resource set pool indices. This allows the unified TCI state to be divided into multiple applicable scenarios with distinct timing parameters, resolving the indefiniteness in the application method while maintaining communication efficiency.
Solution Approach 2:
The patent applies local quality by assigning different timing advance values to different TRP indices and control resource set pool indices. Each local application context (specific TRP or CORESET pool) receives an optimized timing advance value, ensuring reliable communication quality for each specific scenario while maintaining the unified TCI state framework.
2Measurement precision
If different timing advances are applied to different TRP indices, then UL transmission accuracy is improved, but system complexity increases
Solution Approach 1:
The patent changes the timing advance parameter based on TRP index and control resource set pool index. By dynamically adjusting the timing advance value according to the specific TRP or CORESET pool being used, the system achieves precise uplink timing synchronization for each transmission scenario without requiring fundamentally new system architectures.
Data Source
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Figure 3
AI summary
A terminal according to an aspect of the present disclosure includes a receiving section that receives one or more downlink control information (DCI) indicating a unified transmission configuration indication (TCI) state, and a control section that judges a timing advance for a UL transmission, based on a transmission/reception point (TRP) index or a control resource set pool index. In the terminal, different timing advances are applied to UL transmissions associated with different TRP indices or different control resource set pool indices.