Event-Triggered L1/L2 CLI Reporting for Dynamic TDD Interference
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Solution Overview
Problem
Cross-link interference (CLI) in full-duplex (FD) and dynamic time division duplex (TDD) communication systems decreases performance and reliability due to simultaneous uplink and downlink transmissions between user equipment (UEs), leading to inefficiencies and interference.
Innovation Solution
Implement event-triggered layer 1 (L1) and layer 2 (L2) cross-link interference reporting mechanisms in user equipment (UEs) and network nodes, allowing for timely and efficient measurement and reporting of UE-to-UE CLI, including assistance information such as delta timing and power backoff, to facilitate faster and more accurate CLI mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If event-triggered L1 or L2 CLI reporting is implemented, then CLI mitigation speed and accuracy improve, but device complexity and processing overhead increase
Solution Approach 1:
The patent implements dynamic triggering mechanisms for CLI reporting where the reporting behavior adapts based on current CLI conditions. L1 trigger events activate reporting when specific CLI thresholds are exceeded, while L2 trigger events provide higher-layer coordination. This dynamic approach enables the system to switch between quiet operation and active mitigation only when needed, improving reliability without permanently increasing complexity.
Solution Approach 2:
The patent changes the parameter of reporting activation from continuous to event-triggered based on CLI measurement thresholds. By monitoring CLI metrics and activating reports only when predetermined conditions are met, the system achieves effective CLI mitigation while reducing unnecessary processing overhead and maintaining manageable device complexity.
2Measurement precision
If continuous CLI monitoring and reporting is performed, then CLI mitigation accuracy improves, but signaling overhead and latency increase
Solution Approach 1:
The patent implements periodic CLI measurements triggered by specific events rather than continuous monitoring. The system periodically checks CLI conditions against predetermined thresholds and activates reporting only when events occur, achieving accurate CLI detection while minimizing unnecessary signaling overhead and reducing overall reporting latency.
Solution Approach 2:
The patent establishes predetermined trigger conditions and thresholds in advance for both L1 and L2 reporting. By pre-configuring the conditions under which reporting should occur, the system can immediately activate appropriate reporting actions when events are detected, eliminating delays associated with real-time decision-making and reducing reporting latency while maintaining measurement precision.
3Adaptability or versatility
If both L1 and L2 trigger events are supported, then CLI mitigation adaptability improves, but device complexity increases
Solution Approach 1:
The patent segments the CLI reporting mechanism into two distinct layers: L1 trigger events for physical layer measurements and immediate reporting, and L2 trigger events for higher-layer coordination and assistance information. This segmentation allows each layer to handle specific functions independently, improving adaptability to different CLI scenarios while managing device complexity through functional separation rather than requiring all features to operate simultaneously in a monolithic structure.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. Some aspects more specifically relate to event-triggered layer 1 (L1) or layer (L2) cross link interference (CLI) reporting. In some aspects, a user equipment (UE) may perform a UE-to-UE CLI measurement. The UE may transmit an L1 CLI report in connection with a condition associated with an L1 trigger event being satisfied, or the UE may transmit an L2 CLI report in connection with a condition associated with an L2 trigger event being satisfied.