Full-Duplex CSI Framework for Channel and Interference Measurement
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately measuring channel state information (CSI) in full duplex systems due to self-interference and the need for flexible CSI reporting frameworks that can handle various transmission modes, particularly in scenarios involving subband full duplex (SBFD) and time division duplex (TDD) systems.
Innovation Solution
A flexible CSI framework is introduced, allowing for the determination of multiple types of CSI-RS based on specific configurations, enabling accurate channel and interference measurements by distinguishing between different CSI-RS types and reporting bands, and supporting various CSI reporting modes, including wideband and subband reporting with or without time domain restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single CSI-RS resource setting is used for CSI measurement, then device complexity is reduced, but measurement precision deteriorates due to self-interference in full duplex systems
Solution Approach 1:
The patent segments the CSI measurement process by introducing two distinct types of CSI-RS resources: first type CSI-RS for channel measurement and second type CSI-RS for interference measurement. This segmentation allows independent optimization of each measurement type, resolving the contradiction by improving precision through specialized resources while maintaining manageable complexity through clear functional separation.
Solution Approach 2:
The patent applies local quality by configuring different CSI-RS resources with specific properties suitable for their intended measurement purpose. First type CSI-RS resources are configured with parameters optimized for channel measurement, while second type CSI-RS resources are configured for interference measurement, allowing each local measurement process to have the quality needed for its specific function.
2Adaptability or versatility
If flexible CSI reporting frameworks are implemented to handle various transmission modes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal CSI reporting framework that can handle multiple transmission modes (TDD, full duplex, SBFD) through a unified configuration approach. The same basic framework structure supports different transmission modes by simply changing the configuration parameters, achieving adaptability without proportionally increasing complexity.
Solution Approach 2:
The patent introduces dynamic configuration capabilities where CSI-RS resources and reporting parameters can be adjusted based on the transmission mode and channel conditions. This dynamic adaptation allows the system to optimize performance for different scenarios while maintaining a manageable base complexity through a modular configuration structure.
3Measurement precision
If multiple types of CSI-RS are determined based on specific configurations, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments CSI-RS resources into distinct types with clearly defined purposes: first type for channel measurement and second type for interference measurement. This segmentation improves precision by providing specialized resources for each measurement type while managing complexity through clear functional separation and standardized configuration procedures for each type.
Data Source
AI summary
Embodiments of the present disclosure relate to channel state information (CSI) framework in a full duplex (FD) system. According to some embodiments of the disclosure, a UE may: determine a first type of CSI reference signal (CSI-RS) and a second type of CSI-RS based on at least one CSI-RS resource setting and a specific configuration; and measure at least one of the first type of CSI-RS or the second type of CSI-RS to derive a channel measurement or interference measurement for a CSI report.