Dynamic CSI Measurement and Reporting Windows by UE Capability
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Solution Overview
Problem
In high/medium velocity movement scenarios, the throughput between user equipment (UE) and network nodes in mobile communications decreases due to outdated channel state information (CSI) caused by fast channel variations, necessitating improved configurations for CSI measurement and reporting windows.
Innovation Solution
The proposed solution involves determining a maximum supportable time span of the CSI reporting window based on UE capability parameters, including network node-based and UE-based predictions, with mechanisms for adjusting the CSI measurement and reporting windows to accommodate UE processing and prediction capabilities, and introducing UE capability parameters for minimum time gaps and CSI fallback indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the CSI reporting window time span is extended to capture future channel variations, then the accuracy of CSI prediction is improved, but the UE processing complexity and capability requirements increase
Solution Approach 1:
The patent implements dynamic adjustment of the CSI reporting window time span based on UE capability parameters. The network node configures different time spans according to the specific UE's processing capabilities, allowing the system to adapt between longer windows for higher accuracy and shorter windows for lower complexity requirements, resolving the contradiction through capability-based differentiation
Solution Approach 2:
The patent introduces UE capability parameters that define maximum supportable time spans for CSI reporting windows. By changing the time span parameter according to UE capabilities and channel conditions, the system can optimize between prediction accuracy and processing complexity, allowing flexible configuration that adapts to different device capabilities
2Reliability
If the CSI measurement window is extended to include more measurement opportunities, then the reliability of CSI calculation is improved, but the time delay for CSI reporting increases
Solution Approach 1:
The patent dynamically configures the CSI measurement window duration and the offset between measurement and reporting windows based on UE capability parameters and channel conditions. This allows the system to adjust the balance between collecting sufficient measurements for reliable CSI calculation and minimizing the reporting delay, with shorter windows for low-mobility scenarios and longer windows for high-mobility scenarios
3Ease of operation
If the network node configures a fixed CSI reporting window, then the network control is simplified, but the adaptability to different UE capabilities and channel conditions is reduced
Solution Approach 1:
The patent segments the configuration approach by introducing UE capability parameters that categorize different UE types and their maximum supportable time spans. The network node uses these capability segments to select appropriate configuration parameters, maintaining simple control through parameter selection while achieving adaptability through capability-based configuration groups
Solution Approach 2:
The patent enables the network node to configure different time span parameters based on reported UE capability parameters. This allows the system to maintain simple network control through parameter-based configuration while achieving adaptability by selecting from multiple pre-defined capability levels and their associated optimal parameters
Data Source
AI summary
Various solutions for determining channel state information (CSI) measurement window and CSI reporting window with respect to user equipment and network apparatus in mobile communications are described. An apparatus may transmit a user equipment (UE) capability parameter related to a maximum supportable time span of a CSI reporting window. The apparatus may receive a time span of a CSI reporting window configured according to the UE capability parameter.