Quasi-Co-Location Indication for Wireless CSI Measurement Overhead
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Solution Overview
Problem
Coordinated multipoint transmission in wireless communication systems experiences high resource and signaling overheads due to the need for separate channel and interference measurement configurations for each interference hypothesis, especially as network density increases and more transmission points are coordinated.
Innovation Solution
Configuring measurement parameters for terminal devices using a quasi-co-location indication, allowing channel state information to be measured across groups of antenna ports with shared quasi-co-location relationships, reducing the need for separate resource and signaling configurations for each interference hypothesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate channel and interference measurement configurations are provided for each interference hypothesis in coordinated multipoint transmission, then measurement precision is improved, but resource overhead and signaling overhead increase significantly
Solution Approach 1:
The patent combines multiple CSI processes into a single CSI process by merging the channel measurement configuration and interference measurement configuration. Instead of providing separate configurations for each interference hypothesis, the invention integrates them into one unified configuration that can handle multiple interference scenarios, thereby reducing resource overhead and signaling overhead while maintaining measurement precision.
Solution Approach 2:
The patent creates a universal CSI measurement configuration that can serve multiple interference hypotheses simultaneously. The single CSI process is designed to be multi-functional, capable of performing both channel measurement and interference measurement across different interference scenarios without requiring separate dedicated configurations for each hypothesis, thus reducing the quantity of signaling and resources required.
2Adaptability or versatility
If multiple CSI processes are configured to support N-TP coordination, then coordination capability is improved, but signaling overhead increases by a factor of 2N
Solution Approach 1:
The patent merges multiple CSI processes into a single CSI process by combining their configuration elements. The unified configuration includes both channel measurement resources and interference measurement resources in one structure, eliminating the need for separate signaling for each CSI process while maintaining the ability to support N-TP coordination through the integrated design.
Solution Approach 2:
The patent designs a universal CSI configuration structure that can accommodate multiple transmission points and interference hypotheses simultaneously. This multi-functional configuration reduces signaling overhead by providing a single standardized interface for CSI measurement regardless of the number of coordinated TPs, thereby improving scalability without proportional increases in signaling complexity.
Data Source
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AI summary
Embodiments of the present invention provide a method used for wireless communication and an apparatus. The method includes: configuring measurement parameters of channel state information for a terminal device, where the measurement parameters include a channel state information-reference signal configuration and a quasi-co-location indication, the channel state information-reference signal configuration includes configurations of at least two groups of antenna ports, and the quasi-co-location indication is used to indicate whether the at least two groups of antenna ports have a quasi-co-location relationship; and sending the measurement parameters to the terminal device. A corresponding apparatus is further disclosed. According to the solutions of the embodiments of the present invention, when the measurement parameters of the channel state information are configured for the terminal device, the terminal device is instructed, by using the quasi-co-location indication, to measure the channel state information on each group of antenna ports, and it is unnecessary that each interference hypothesis corresponds to a channel state information process to perform separate resource and signaling configuration, reducing resource overheads and signaling overheads of a base station.