QCL Relationship Determination via DCI Indication
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Solution Overview
Problem
In existing LTE systems, terminal devices cannot determine the quasi co-location (QCL) relationships between antenna ports, which affects network performance as they are not configured by the network device, hindering accurate channel estimation and data demodulation.
Innovation Solution
A method and device are introduced to generate and send downlink control information (DCI) with QCL indication information, allowing terminal devices to determine QCL relationships between antenna ports, specifically between DMRS and CSI-RS antenna ports, by using preconfigured combination information corresponding to the QCL indication information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the network device does not configure QCL relationships for the terminal device, then the system maintains simplicity in configuration, but the terminal device cannot determine QCL relationships between antenna ports, affecting network performance
Solution Approach 1:
The network device pre-configures multiple pieces of combination information including QCL relationships between first antenna port information and second antenna port information. The terminal device stores this information in advance and selects appropriate combinations based on DCI indicators, eliminating the need for real-time QCL configuration while ensuring accurate channel estimation.
Solution Approach 2:
Combination information serves as an intermediary between the network device and terminal device. Instead of directly configuring QCL relationships, the network device configures combination information that encapsulates QCL relationships, and the terminal device uses this intermediary information to determine QCL relationships when needed.
2Measurement precision
If the network device configures QCL relationships through DCI with combination information, then the terminal device can accurately determine QCL relationships, but the system complexity increases
Solution Approach 1:
The QCL configuration is segmented into multiple independent combination information pieces, each containing specific QCL relationships. The DCI indicates which combination to use without transmitting the entire QCL configuration, reducing overhead while maintaining precision.
Solution Approach 2:
All possible QCL combination information is pre-configured and stored in the terminal device. When DCI is received, the terminal device simply selects the appropriate pre-configured combination based on the indicator, avoiding complex real-time calculations while ensuring accurate QCL determination.
Data Source
AI summary
This application provides a method and device for determining antenna port quasi co-location QCL. The method includes: generating, by a network device, downlink control information DCI, where the DCI includes QCL indication information, the QCL indication information is used to indicate one of a plurality of pieces of combination information, and first combination information in the plurality of pieces of combination information is used to indicate a QCL relationship between a DMRS antenna port and a CSI-RS antenna port; and sending, by the network device, the DCI to a terminal device. Therefore, in embodiments of this application, the terminal device can determine the QCL relationship between the DMRS antenna port and the CSI-RS antenna port based on the DCI, thereby resolving a problem in the prior art and improving network performance.