MIMO Port Grouping for Channel Feedback Precision
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Solution Overview
Problem
In multiple input multiple output (MIMO) systems, the limited number of ports results in low channel feedback precision, affecting transmission performance due to mismatched channel coefficients and reduced data transmission rates.
Innovation Solution
The method involves using multiple port groups with each group containing at least two ports, where the terminal device transmits first linear combination coefficient groups to the base station to improve channel feedback precision, allowing for more accurate precoding matrix determination and enhanced transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a limited number of ports are used for transmission, then the device complexity is reduced, but the channel feedback precision deteriorates
Solution Approach 1:
The patent divides the limited ports into multiple port groups, where each port group contains multiple ports that can be selectively activated. This segmentation allows the system to present more channel coefficients to the terminal device without increasing the physical number of ports, thereby improving channel feedback precision while maintaining device complexity at an acceptable level.
Solution Approach 2:
The patent introduces a new dimension of port grouping and selection mechanisms. Instead of simply increasing the number of physical ports, the system creates virtual port groups and uses selection indicators to expand the effective port space. This dimensional approach allows more channel coefficients to be measured and fed back without proportionally increasing hardware complexity.
2Measurement precision
If more ports are used to improve channel feedback precision, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent makes the limited set of ports multi-functional by organizing them into multiple port groups where ports can serve different functions in different scenarios. Each port can belong to multiple port groups and be selected for different channel coefficient measurements depending on the transmission conditions, thereby maximizing the utility of each physical port to improve channel feedback precision without adding more ports.
3Reliability
If channel coefficients do not match the actual channel condition, then the transmission performance deteriorates, but increasing ports to improve matching increases device complexity
Solution Approach 1:
The patent implements dynamic port group selection where the terminal device selects the most appropriate port group based on current channel conditions. The selection indicator allows the system to adaptively choose which port group's channel coefficients to use, ensuring that the best matching channel coefficients are selected for the actual channel condition, thereby improving transmission performance without requiring all ports to be active simultaneously.
Data Source
AI summary
Embodiments of the present invention provide a communication method, a base station, and a terminal device. The method includes: transmitting, by a base station, signals to a terminal device by using n port groups, where each of the n port groups includes at least two ports; and receiving, by the base station, s first linear combination coefficient groups transmitted by the terminal device, where each first linear combination coefficient group includes first linear combination coefficients of one of s port groups, at least one first linear combination coefficient group includes at least two non-zero coefficients, the s first linear combination coefficient groups are used to determine a first precoding matrix, the s port groups are included in the n port groups. This can improve channel feedback precision of the terminal device, and further help improve performance of transmission between the base station and the terminal device.