Terminal TRP State Activation via Segmented Control Information
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Solution Overview
Problem
In future radio communication systems, the control of signal transmission and reception processes across multiple transmission and reception points is challenging, particularly in scheduling Physical Downlink Shared Channels (PDSCHs) using a single piece of downlink control information, which can lead to deterioration in communication quality if not managed appropriately.
Innovation Solution
A terminal is equipped with a receiving section to process multiple pieces of control information indicating activation of Transmission and Reception Point (TRP) states and a control section that determines the appropriate TRP state based on specific fields within the control information, allowing for precise management of TRP states and improved communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single piece of downlink control information is used to schedule PDSCHs from multiple transmission and reception points, then device complexity is reduced, but communication quality deteriorates due to insufficient control precision
Solution Approach 1:
The patent segments the TCI state configuration into multiple components: a first TCI state for beam indication and a second TCI state for QCL relationship indication. This segmentation allows each component to serve its specific function independently, maintaining communication quality while using a unified DCI structure.
Solution Approach 2:
The patent applies different quality characteristics to different parts of the control information. The first TCI state provides precise beam direction control, while the second TCI state provides accurate QCL relationship information. This local quality differentiation ensures that each aspect of communication receives appropriate control precision.
2Reliability
If multiple TCI states are activated for multiple transmission and reception points, then communication quality is improved, but control information processing complexity increases
Solution Approach 1:
The patent segments the TCI state activation process into two independent phases: first activating TCI states for beam indication, then activating TCI states for QCL relationship indication. This segmentation allows the UE to process control information in manageable steps rather than handling all TCI states simultaneously.
Solution Approach 2:
The patent performs preliminary activation of TCI states through MAC CE signaling before the actual PDSCH reception. This preliminary action allows the UE to prepare and store the necessary TCI state information in advance, reducing the processing burden during real-time communication.
3Ease of operation
If TCI states are activated without precise TRP identification, then ease of operation is improved, but communication quality deteriorates due to incorrect TRP state activation
Solution Approach 1:
The patent incorporates feedback mechanisms where the UE reports received TCI state information back to the network. This feedback loop allows the system to verify that TCI states were activated correctly and adjust subsequent activations to ensure accurate TRP identification.
Solution Approach 2:
The patent replaces complex mechanical TRP identification mechanisms with information-based approaches using TCI state indexing and MAC CE signaling. This substitution simplifies the activation process while maintaining or improving accuracy through structured information encoding.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a plurality of pieces of first control information to indicate activation of TCI states respectively corresponding to transmission and reception points and second control information to designate a specific TCI state from activated TCI states, and a control section that determines, based on a value of a specific field included in the first control information, a transmission and reception point to which a TCI state to be activated corresponds.