PDCCH TCI State Configuration for Multi-TRP Monitoring
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Solution Overview
Problem
In high-frequency ranges such as millimeter wave bands, radio wave blocking is a significant issue, and existing methods for supporting multiple transmission/reception points (TRPs) in future radio communication systems lead to delays and increased load on user terminals, resulting in decreased communication throughput.
Innovation Solution
The proposed solution involves configuring the transmission configuration indicator (TCI) state for physical downlink control channels (PDCCH) with finer granularity, allowing for flexible configuration across search spaces and CORESETs, enabling efficient monitoring of PDCCH even in multi-TRP scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP transmission is implemented to overcome radio wave blocking in high frequency ranges, then communication reliability is improved, but device complexity and processing load on user terminal increase
Solution Approach 1:
The patent segments the monitoring of PDCCH candidates by associating different search space sets with different TCI states. Instead of monitoring all PDCCH candidates across all TRPs simultaneously, the user terminal divides the monitoring task into separate search space sets, each linked to a specific TCI state (and thus a specific TRP). This segmentation reduces the instantaneous processing load and complexity at the user terminal while maintaining reliable communication through multi-TRP diversity.
2Reliability
If multi-TRP transmission is implemented to overcome radio wave blocking, then communication reliability is improved, but processing load on user terminal increases
Solution Approach 1:
The patent segments the monitoring of PDCCH candidates by associating different search space sets with different TCI states. Instead of monitoring all PDCCH candidates across all TRPs simultaneously, the user terminal divides the monitoring task into separate search space sets, each linked to a specific TCI state (and thus a specific TRP). This segmentation reduces the instantaneous processing load and complexity at the user terminal while maintaining reliable communication through multi-TRP diversity.
3Device complexity
If traditional PDCCH monitoring method is used, then device complexity is reduced, but communication throughput decreases due to delays
Solution Approach 1:
The patent introduces dynamic TCI state indication for PDCCH monitoring. The network can dynamically indicate which TCI state (and thus which TRP) should be used for monitoring specific search space sets, allowing flexible adaptation to changing channel conditions. This dynamic approach enables the system to optimize throughput by selecting the best TRP while keeping the user terminal complexity manageable through the structured search space set framework.
Solution Approach 2:
The patent changes the parameter of TCI state configuration from static to dynamic. By allowing the network to dynamically indicate TCI states for different search space sets, the system can adapt to varying channel conditions and traffic requirements, thereby improving communication throughput. The user terminal complexity remains controlled because the TCI state changes are indicated through existing signaling mechanisms rather than requiring fundamental architectural changes.
Data Source
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AI summary
A user terminal according to an aspect of the present disclosure includes: a receiving section that receives configuration information regarding to search space configuration; and a control section configured to determine a transmission configuration indicator (TCI) state (TCI-state) for each physical downlink control channel (PDCCH) candidate or aggregation level included in a given control resource set (CORESET) based on the configuration information. According to an embodiment of the present disclosure, it is possible to monitor appropriately PDCCH even in the case of using multi-Transmission/Reception Point (TRP).