Full-Duplex CLI Reporting via CSI-IM Resources
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Solution Overview
Problem
Current wireless communication systems, particularly in full-duplex mode, face challenges in effectively reporting and mitigating intra-cell cross-link interference (CLI) and self-interference, which degrade communication quality and efficiency.
Innovation Solution
A method and apparatus that configure channel state information (CSI-IM) resources in a downlink bandwidth part (BWP) of a full-duplex slot, enabling User Equipment (UE) to measure and report CLI and self-interference components, including received signal strength indication (RSSI), reference signal received power (RSRP), and reference signal received quality (RSRQ), to the base station, using sounding reference signals (SRS).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communication is implemented to improve spectral efficiency, then communication capacity increases, but intra-cell cross-link interference and self-interference worsen
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures CLI and self-interference using CSI-IM resources and reports the measurements (RSSI, RSRP, RSRQ) back to the base station. This feedback loop enables the base station to adjust scheduling and resource allocation to mitigate the interference caused by full-duplex operation, thus resolving the contradiction between spectral efficiency and interference.
2Productivity
If full-duplex communication is implemented to improve communication capacity, then system throughput increases, but communication quality deteriorates due to interference
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures CLI and self-interference using CSI-IM resources and reports the measurements (RSSI, RSRP, RSRQ) back to the base station. This feedback loop enables the base station to adjust scheduling and resource allocation to mitigate the interference caused by full-duplex operation, thus resolving the contradiction between spectral efficiency and interference.
3Device complexity
If traditional interference measurement methods are used, then measurement complexity is reduced, but measurement precision of CLI and self-interference is insufficient
Solution Approach 1:
The patent segments the interference measurement process into distinct components by configuring separate CSI-IM resources for different interference types (CLI from other UEs, self-interference). This segmentation allows the UE to measure and report different interference components separately using standardized measurement procedures (RSSI, RSRP, RSRQ), thereby improving measurement precision without significantly increasing overall system complexity.
Data Source
AI summary
A base station may configure CSI-IM resources in a downlink BWP in a full-duplex slot. A UE may measure interference components in the CSI-IM resources and generate/transmit a CLI report comprising the measurement of the interference components to the base station. The measurement of interference components may include an RSSI measurement of intra-cell CLI from an interfering uplink signal transmitted from an aggressor UE or a self-interference from an uplink channel of the UE. The uplink signal may be an SRS, and the CLI report may include the RSSI, an RSRP, and/or an RSRQ of the interference in the CSI-IM resources in the uplink channel. The CSI-IM resources and the CLI report may have various configurations.