Partial CSI-RS Muting for Throughput and Channel Estimation
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Solution Overview
Problem
Current methods for transmitting Channel State Information Reference Symbols (CSI-RS) with partial muting techniques in mobile communication systems lead to system throughput degradation due to reduced resource elements for data transmission, compromising performance and capacity gains.
Innovation Solution
A method and apparatus for transmitting CSI-RS and data that involves determining CSI-RS and muting patterns, mapping data symbols and CSI-RS to resource elements with rate patching, and using OFDM to modulate and transmit these signals, allowing for optimal resource allocation and interference reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If partial muting technique is applied to reduce interference to CSI-RS, then channel estimation performance is improved, but system throughput deteriorates due to reduced resource elements for data transmission
Solution Approach 1:
The patent applies partial muting by selectively muting only those resource elements that are actually occupied by CSI-RS from other cells, rather than muting all potential CSI-RS resources. This partial action approach reduces interference to CSI-RS sufficiently to improve channel estimation performance, while minimizing the loss of resource elements for data transmission, thus preserving system throughput.
2Measurement precision
If more resource elements are allocated to CSI-RS for better channel estimation, then measurement precision is improved, but the quantity of resource elements available for data transmission decreases
Solution Approach 1:
The patent extracts and removes only the specific resource elements that are occupied by CSI-RS from other cells and causes interference, applying muting selectively to these extracted problematic elements. This approach improves channel status information accuracy by eliminating interference from critical resources, while preserving the majority of resource elements for data transmission.
3Object-affected harmful factors
If muting pattern is applied to keep time frequency antenna and code resources empty, then interference to reference signal is reduced, but system capacity deteriorates due to reduced resource utilization
Solution Approach 1:
The patent applies muting with local quality by selectively muting only the specific time-frequency antennas and code resources that are actually occupied by interfering CSI-RS, rather than applying a blanket muting pattern across all resources. This localized approach reduces interference to reference signals precisely where needed, while maintaining resource utilization and system capacity in non-interfering regions.
Data Source
AI summary
A method and apparatus for transmitting Channel State Information Reference Symbol (CSI-RS) and data with partial muting of the CSI-RS are proposed. The method includes determining a CSI-RS pattern to be used among CSI-RS pattern candidates, determining a muting pattern for muting some resource elements constituting CSI-RS pattern candidates except for the determined CSI-RS pattern, mapping data symbols and CSI-RS to resource elements in a resource grid with rate patching in consideration of the CSI-RS pattern and muting pattern, and transmitting the data symbols and CSI-RS to a terminal.