MAC-CE Activation of Semi-Persistent CLI Resources
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in effectively managing cross-link interference (CLI) and self-interference (SI) due to the complexity of full-duplex operations, which impact communication quality and efficiency.
Innovation Solution
The method involves configuring semi-persistent (SP) resources for CLI or SI measurements, activating these resources using a Medium Access Control (MAC) control element (CE), and reporting interference components to the base station, allowing for estimation and mitigation of CLI through reciprocity principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If semi-persistent resources are configured for CLI measurement, then measurement accuracy is improved, but resource overhead and system complexity increase
Solution Approach 1:
The base station pre-configures semi-persistent CLI measurement resources (CSI-IM resources) for future use. When CLI measurement is needed, the base station simply activates these pre-configured resources using a MAC CE command rather than configuring them from scratch, reducing signaling overhead and system complexity while maintaining measurement accuracy
Solution Approach 2:
The patent implements dynamic activation and deactivation of CLI measurement resources through MAC CE commands. The semi-persistent resources can be activated when needed and deactivated when not needed, allowing the system to adapt resource usage to actual CLI measurement requirements, thereby reducing overall resource overhead while maintaining measurement capability when required
2Productivity
If MAC-CE activation is used for SP resources, then resource utilization efficiency is improved, but control signaling overhead increases
Solution Approach 1:
The base station performs preliminary configuration of CLI measurement resources through RRC signaling, establishing a pool of pre-configured semi-persistent resources. Subsequent MAC CE activation commands simply select from this pre-configured pool rather than transmitting full resource configuration details, significantly reducing control signaling overhead while maintaining efficient resource utilization
Solution Approach 2:
The patent separates the CLI measurement resource configuration into two distinct phases: (1) RRC-level configuration of semi-persistent resource pools, and (2) MAC CE-level activation of specific resources from the pool. This segmentation allows detailed resource parameters to be configured once at a higher layer, while lower-layer activation uses compact MAC CE commands, reducing overall signaling overhead
Data Source
AI summary
A UE may receive a configuration of one or more SP resources for CLI and/or SI measurement, and receive, from the base station, a MAC-CE activating the configured one or more SP resources for CLI and/or SI measurements. The UE may measure the CLI and/or SI based on interference signal and report a CLI report, including the measured CLI and/or SI to the base station. The UE may estimate average CL based on an average transmission power of the interference signal over multiple slots from an aggressor UE, and the base station may use the estimated average CL to determine CLI for aggressor UE based on CLI reciprocity.