CQI Calculation Using CSI-RS Mapping for C-JT Channel Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The current CSI feedback mechanism in Rel-15˜Rel-17 standards cannot accurately reflect the true channel quality experienced by resource ports in coherent joint transmission (C-JT) schemes, leading to reduced data transmission performance and overall network throughput.
Innovation Solution
A method and apparatus for calculating channel quality information by setting a mapping relationship between the physical downlink shared channel (PDSCH) and corresponding symbols, allowing for accurate CQI calculation based on multiple CSI-RS resources, enhancing data transmission performance and network throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the current CSI feedback mechanism (Rel-15 to Rel-17) is used for C-JT transmission, then the feedback process is simple and compatible with existing standards, but the channel quality information cannot accurately reflect the true channel quality experienced by resource ports, leading to reduced data transmission performance
Solution Approach 1:
The patent segments the channel quality feedback into multiple components: separate feedback for each TRP's channel quality, precoding matrix indication (PMI), rank indication (RI), and channel quality indication (CQI). This segmentation allows accurate measurement of true channel quality while maintaining manageable complexity through structured information decomposition.
Solution Approach 2:
The patent introduces a new dimension to CSI feedback by adding TRP-specific channel quality measurements and mapping relationships between PDSCH antenna ports and CSI-RS resources. This dimensional expansion enables accurate reflection of true channel quality in C-JT schemes while providing the network with comprehensive information for optimized data scheduling.
2Productivity
If accurate CQI calculation is implemented with proper PDSCH-CSI-RS mapping, then data transmission performance and network throughput are improved, but the calculation complexity and processing requirements increase
Solution Approach 1:
The patent performs preliminary actions by pre-establishing mapping relationships between PDSCH antenna ports and CSI-RS resources, and pre-configuring the feedback mechanism structure. This allows the terminal to efficiently calculate accurate CQI values during data transmission without performing complex real-time computations, thereby improving network throughput while managing processing requirements.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal calculates and reports accurate CQI information back to the network device. This feedback loop enables the network to optimize data scheduling based on true channel quality measurements, improving overall network throughput and data transmission performance while the terminal processes the calculations using the established mapping relationships.
3Measurement precision
If multiple CSI-RS resources are used for joint channel measurement in C-JT, then the channel quality information becomes more accurate, but the measurement and processing time increase
Solution Approach 1:
The patent segments the channel measurement process into TRP-specific measurements, where each TRP's channel quality is measured independently using its corresponding CSI-RS resources. This segmentation allows parallel processing of measurements from multiple TRPs, improving accuracy while reducing total measurement and processing time through concurrent operations.
Solution Approach 2:
The patent performs preliminary configuration of CSI-RS resources and mapping relationships before actual channel measurement. This pre-configuration establishes the framework for efficient measurement, allowing the terminal to quickly process and compare multiple CSI-RS resources without performing complex real-time computations, thus reducing measurement and processing time while maintaining high accuracy.
Data Source
AI summary
A method and apparatus for calculating channel quality information and a communication system. The apparatus applicable to a terminal equipment and includes: a receiver configured to receive first channel state information reference signal (CSI-RS) resource configuration from a network device, the first CSI-RS resource configuration at least including a first resource set having K CSI-RS resources, K being a natural number greater than or equal to 2; and a processor circuitry configured to calculate a channel quality indicator (CQI) at least based on M CSI-RS resources, the M CSI-RS resources being related to K CSI-RS resources, and M being a natural number less than or equal to K, wherein the calculation of the CQI is at least based on an assumed first physical downlink shared channel (PDSCH) signal, the first PDSCH transmitted on antenna ports [1000, . . . , 1000+v−1], the first PDSCH related to corresponding symbols transmitted on antenna ports [3000, . . . , 3000+P−1].