Precoding Matrix Group Power Configuration for CSI Measurement
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Solution Overview
Problem
In coordinated multipoint transmission (CoMP) technologies, the inaccuracy of channel state information (CSI) measurement leads to poor performance of the precoding matrix, resulting in suboptimal data transmission and reduced system capacity.
Innovation Solution
Configuring and sending power configuration information for different precoding matrix groups to the user equipment (UE) to improve the accuracy of CSI measurement, allowing for the selection of a precoding matrix with better performance for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI measurement is performed using a single precoding matrix group, then the measurement process is simple, but the measurement accuracy is insufficient leading to poor precoding matrix performance
Solution Approach 1:
The patent divides the precoding matrix group into multiple sub-groups, each with different power configuration information. The UE performs CSI measurement separately for each sub-group, allowing accurate measurement of different precoding matrices under different power conditions. This segmentation resolves the contradiction by improving measurement accuracy through detailed subdivision while managing complexity through structured organization of the sub-groups.
Solution Approach 2:
The patent applies different power configuration information to different precoding matrix sub-groups, creating local optimizations tailored to specific transmission conditions. Each sub-group is configured with power parameters appropriate for its characteristics, allowing the system to achieve high measurement accuracy for diverse precoding scenarios without requiring a single complex unified configuration.
2Measurement precision
If power configuration information is configured for multiple precoding matrix groups, then the accuracy of CSI measurement is improved, but the signaling overhead increases
Solution Approach 1:
The patent introduces power configuration information as a new parameter dimension for precoding matrix groups. By adding this parameter, the system enables accurate CSI measurement that accounts for different power conditions without requiring separate measurement procedures. This parameter change resolves the contradiction by improving measurement accuracy through enhanced information representation while managing signaling overhead through efficient parameter encoding.
3Reliability
If a precoding matrix is selected based on inaccurate CSI measurement, then the selection process is fast, but the transmission performance is poor
Solution Approach 1:
The patent performs preliminary CSI measurements for multiple precoding matrix sub-groups before actual data transmission. By pre-configuring power configuration information and performing measurements in advance, the system builds a reliable basis for precoding matrix selection. This preliminary action resolves the contradiction by ensuring high transmission performance through accurate pre-measurement while managing selection time through efficient use of pre-collected measurement data.
Data Source
AI summary
Embodiments of the present invention provide a communication method. A first network device configures power configuration information for each of at least two precoding matrix groups, and sends the power configuration information to a second network device. The power configuration information is used to indicate a power configuration of a corresponding precoding matrix group of the at least two precoding matrix groups, and the at least two precoding matrix groups belong to a same resource used to measure channel state information CSI. When the second network device performs CSI measurement, different power values of different precoding matrix groups can be considered, thereby increasing accuracy of the CSI measurement.