Terminal PDSCH Reception with TCI-Based Multi-Point Beam Control
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Solution Overview
Problem
Existing radio communication systems face challenges in effectively receiving downlink data from multiple transmission points, particularly for high-speed moving objects like trains, leading to potential throughput decreases due to inadequate beam control and handover processes.
Innovation Solution
A terminal equipped with a receiving section that processes information on transmission configuration indication (TCI) states for demodulation reference signals and a control section that determines resource allocation for multiple PDSCHs, enabling appropriate reception of downlink data from multiple transmission points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beams are transmitted from multiple transmission points to achieve communication with high-speed moving objects, then communication coverage and reliability are improved, but the complexity of receiving and managing downlink data from multiple transmission points increases
Solution Approach 1:
The patent segments the downlink data reception by associating each transmission point with a specific transmission configuration indication (TCI) state. The terminal divides the management of multiple PDSCHs by grouping them according to their respective TCI states, which correspond to different transmission points. This segmentation allows the terminal to handle multiple transmission points independently through structured control information, reducing the overall reception control complexity while maintaining communication reliability.
2Productivity
If multiple PDSCHs are used to carry downlink data from multiple transmission points, then data throughput is improved, but the difficulty of determining resource allocation and TCI states increases
Solution Approach 1:
The patent implements a feedback mechanism where the terminal determines resource allocation and TCI states for multiple PDSCHs based on downlink control information (DCI) received from the network. The DCI contains explicit indications of TCI states and resource allocations, providing feedback from the network side to guide the terminal's reception process. This feedback approach simplifies the terminal's task by providing pre-determined resource allocation information, reducing the difficulty of detecting and measuring appropriate reception parameters while enabling high data throughput through multiple PDSCHs.
3Measurement precision
If TCI states are configured for multiple transmission points, then beam control precision is improved, but the amount of control information and processing overhead increases
Solution Approach 1:
The patent applies universality by using a unified TCI state framework that can serve multiple transmission points. Each TCI state is configured to represent a specific beam direction or transmission configuration, and the same TCI state indication mechanism is universally applied across all transmission points. This multi-functional approach allows the system to maintain precise beam control for each transmission point while using a standardized, compact control information structure, thereby reducing the overall quantity of control information needed compared to having separate control mechanisms for each transmission point.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes: a receiving section that receives information indicating a plurality of transmission configuration indication (TCI) states for a same demodulation reference signal (DMRS) port for physical downlink shared channel (PDSCH); and a control section that determines, based on downlink control information, at least one of a TCI state and resource allocation of each of a plurality of PDSCHs that carry same downlink data. According to an aspect of the present disclosure, it is possible to appropriately receive downlink data from a plurality of transmission points.