CLI Reporting Configuration for Full Duplex Interference Mitigation
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in managing cross-link interference (CLI) in full duplex communications, which can lead to interference between UEs and base stations, affecting channel state information measurements and overall network performance.
Innovation Solution
A method and apparatus for configuring cross-link interference (CLI) reporting by defining channel state information interference measurement (CSI-IM) resources, including configurations for aperiodic, semi-persistent, or periodic reporting, and indicating specific measurement parameters such as wideband or narrowband CLI reports, SRS frequency hopping patterns, and quasi-co-location spatial receive parameters to generate accurate CLI reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is implemented to improve spectral efficiency, then network capacity increases, but cross-link interference between UEs and base stations worsens
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands and assigns different duplex modes to different sub-bands. Specifically, some sub-bands operate in full duplex mode while others operate in half duplex mode, allowing the system to benefit from full duplex spectral efficiency in certain frequency regions while avoiding cross-link interference in others. This frequency-domain segmentation resolves the contradiction by spatially separating interfering signals.
Solution Approach 2:
The patent applies different communication modes (full duplex vs. half duplex) to different local frequency regions (sub-bands) based on interference conditions. The base station configures the UE to measure CLI on specific sub-bands and report results, enabling localized quality adjustment where full duplex is applied only where it provides benefit without causing harmful interference.
2Measurement precision
If CLI measurement resources are increased to improve interference detection accuracy, then measurement precision improves, but signaling overhead and device complexity worsen
Solution Approach 1:
The patent divides CLI measurement resources into multiple CSI-IM resource sets, where each set corresponds to specific sub-bands or frequency regions. Instead of measuring all sub-bands uniformly, the UE is configured with multiple resource sets that can be selectively activated based on interference conditions. This segmentation allows precise measurement where needed while reducing overall measurement burden.
Solution Approach 2:
The patent implements dynamic CLI measurement configuration where the base station can activate or deactivate specific CSI-IM resource sets based on reported interference levels and network conditions. The measurement configuration is not static but adapts over time, allowing the system to increase measurement precision only when and where CLI problems are detected, thereby reducing average device complexity and signaling overhead.
3Ease of operation
If wideband CLI reporting is used to simplify reporting procedures, then ease of operation improves, but measurement precision worsens due to averaging effects
Solution Approach 1:
The patent segments CLI reporting into wideband and sub-band levels. The UE can be configured to report CLI measurements at different granularities: wideband CLI provides overall interference level for simple scheduling decisions, while sub-band CLI measurements provide detailed frequency-specific information for precise interference mitigation. This segmentation allows the system to use simple wideband reporting when sufficient while resorting to detailed sub-band reporting when needed.
Solution Approach 2:
The patent merges wideband and sub-band CLI reporting mechanisms into a unified framework. The UE measures CLI on configured CSI-IM resources and can report both aggregated wideband values and detailed sub-band values depending on configuration. This merging allows the system to benefit from both simplicity (wideband) and precision (sub-band) by selecting the appropriate reporting granularities for different scenarios.
Data Source
AI summary
A victim user equipment (UE) may experience cross-link interference (CLI) from transmissions from an aggressor UE. The present disclosure provides for configuration of a CLI report that accurately characterizes the CLI experienced by the victim UE. A base station may transmit to the victim UE, a configuration for CLI reporting associated with one or more channel state information interference measurement (CSI-IM) resources. The victim UE may generate a CLI report based on the configuration for CLI reporting and the CSI-IM resources. The victim UE may transmit the CLI report to the base station. The base station may use the CLI report to mitigate the CLI, for example, by scheduling the aggressor UE and the victim UE to reduce CLI experienced by the victim UE.