Wireless Device CSI Filtering Coordination
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Solution Overview
Problem
Current wireless communication networks face challenges in optimizing Channel State Information (CSI) filtering, leading to suboptimal performance due to varying CSI reporting costs and filtering methods across different devices, which affects coordination features and link adaptation.
Innovation Solution
A method where wireless devices determine and transmit recommended CSI filtering configurations to radio network nodes based on received reference signals, allowing for coordinated selection of optimal CSI filtering and update rates, reducing feedback costs and improving network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different wireless devices use different CSI filtering methods, then device-specific optimization is achieved, but network coordination and overall performance deteriorate
Solution Approach 1:
The patent changes the filtering parameter (time filtering vs frequency filtering) based on device characteristics and channel conditions. Different wireless devices can be configured with different CSI filtering approaches (time-domain filtering for some devices, frequency-domain filtering for others) according to their mobility, antenna configuration, and channel properties, thereby achieving device-specific optimization while maintaining network-wide coordination through standardized configuration mechanisms
2Loss of energy
If CSI filtering is applied to reduce feedback overhead, then reporting costs are reduced, but CSI accuracy and link adaptation performance may deteriorate
Solution Approach 1:
The patent implements dynamic CSI filtering where the filtering approach (time-domain or frequency-domain) and filtering parameters are adaptively adjusted based on current channel conditions, device mobility, and traffic requirements. This dynamic adaptation allows the system to minimize feedback overhead when channel conditions are stable while maintaining high CSI accuracy when conditions change rapidly, thus resolving the contradiction between reduced reporting costs and maintained measurement precision
Solution Approach 2:
Different filtering strategies are applied to different CSI components (e.g., CQI, PMI, RI) based on their specific characteristics and importance. Critical CSI elements maintain higher accuracy with less filtering, while less critical elements use more aggressive filtering to reduce overhead, achieving local optimization of the quality-overhead tradeoff
3Stability of the object's composition
If time filtering is used for CSI, then fast fading variations are filtered out, but coordination features between multiple radio network nodes deteriorate
Solution Approach 1:
The patent segments the CSI filtering process into device-specific filtering (applied individually at each wireless device) and network-coordinated filtering (applied consistently across multiple nodes). By separating these filtering functions and allowing independent optimization of each, the system can achieve stable CSI at the device level while maintaining coordination capability at the network level through standardized interfaces and configuration mechanisms
Data Source
AI summary
Embodiments herein relate to a method performed by wireless device for applying a Channel State Information, CSI, filtering in a wireless communication network. The wireless device determines a recommended CSI filtering based on measurements of one or more received reference signals from a radio network node. The wireless device transmits, to the radio network node, a first indication of the determined recommended CSI filtering. The wireless device receives, from the radio network node or another radio network node, a first configuration of CSI filtering; and uses the received first configuration for applying CSI filtering.