Multi-TRP PDSCH QCL Configuration Through TCI State Signaling
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Solution Overview
Problem
In the NR radio communication system, configuring appropriate Quasi Co-Location (QCL) configurations for Multiple-Input and Multiple-Output (MIMO) using multiple Transmission Reception Points (TRPs) or panels is challenging due to limitations in existing TCI state configurations.
Innovation Solution
A user equipment is equipped with a reception unit to receive information on transmission configuration states from a base station, a control unit to apply individual QCL configurations to downlink shared channels, and a communication unit to facilitate communication using multiple TRPs or panels, utilizing RRC signaling, MAC signaling, and DCI to activate specific TCI states for each TRP or panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single TCI state configuration is used for downlink shared channels, then the control signal format remains simple, but appropriate QCL configurations for multiple TRPs or panels cannot be achieved
Solution Approach 1:
The patent divides the TCI state configuration into multiple independent TCI states (first TCI state and second TCI state), each corresponding to different TRPs or panels. This segmentation allows independent configuration of QCL parameters for each transmission point, enabling appropriate QCL assumptions for multiple TRPs while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent applies different QCL configurations locally to different TRPs or panels through distinct TCI states. Each TCI state contains specific QCL information tailored to its corresponding TRP or panel, allowing optimized local configuration rather than a uniform global configuration, thus achieving adaptability for multiple TRPs.
2Reliability
If multiple TCI states are configured for different TRPs or panels, then appropriate QCL configurations can be achieved, but the signaling overhead and configuration complexity increase
Solution Approach 1:
The patent performs preliminary configuration of multiple TCI states through RRC signaling before actual data transmission. By pre-configuring the TCI states with their respective QCL information, the system prepares the necessary configuration data in advance, reducing the need for repeated signaling during transmission and thereby reducing overall signaling overhead.
Solution Approach 2:
The patent enables the user equipment to self-manage the activation and selection of TCI states through MAC CE signaling and DCI indication. The UE autonomously activates appropriate TCI states based on network indications and selects the correct TCI state for receiving downlink shared channels from different TRPs, reducing the need for detailed network control signaling.
Data Source
AI summary
A user equipment includes a receiver that receives information associated with a TCI state for a PDSCH from a base station apparatus, a controller that individually applies, based on the information associated with a TCI state, configurations associated with a QCL to respective PDSCHs transmitted from a first TRP or panel, or a second TRP or panel, and a communication unit that performs communication via the PDSCHs to which the configurations associated with the QCL are applied. The information associated with the TCI state includes an RRC signaling, a MAC signaling and DCI, the PRO signaling includes multiple TCI states, the MAC signaling activates a number of TCI states applied to the second TRP or panel from among the multiple TCI states, and the DCI has a field indicating, from among the number of activated TCI states, a TCI state for a PDSCH transmitted from the second TRP or panel.