IAB Node CLI Measurement and Reporting for Shared-Channel Coordination
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Solution Overview
Problem
Integrated access and backhaul (IAB) networks experience inter-IAB-node cross-link interference (CLI) due to simultaneous transmissions over shared wireless channels, which current measurement and reporting mechanisms fail to adequately address, leading to inefficient coordination and potential service disruptions.
Innovation Solution
Implementing measurement and reporting mechanisms at IAB nodes to quantify CLI, including RSRP, RSRQ, and SINR measurements, and utilizing RRC signaling to report interference levels, with options for aggregated or specific reporting of CLI from neighboring IAB nodes to facilitate coordinated interference mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IAB nodes perform simultaneous transmissions over shared wireless channels, then network connectivity and throughput are improved, but inter-IAB-node cross-link interference increases
Solution Approach 1:
The patent implements measurement and reporting mechanisms where IAB nodes measure CLI levels using reference signals and report these measurements to the network. This feedback loop enables the network to monitor interference levels and adjust transmissions accordingly, allowing simultaneous transmissions to proceed when interference is acceptable while preventing service disruptions when interference becomes problematic.
Solution Approach 2:
The patent performs preliminary measurements of CLI levels before actual data transmissions occur. By measuring reference signals from neighboring IAB nodes in advance, the network can predict potential interference issues and prepare mitigation strategies beforehand, such as adjusting transmission schedules or power levels to prevent harmful interference while maintaining productivity.
2Device complexity
If current measurement and reporting mechanisms are used, then implementation complexity is reduced, but CLI management effectiveness is insufficient
Solution Approach 1:
The patent segments the measurement and reporting process into distinct components: reference signal transmission, measurement execution, and report generation. This segmentation allows each component to be optimized independently and facilitates better CLI management by providing detailed, structured information about interference levels from specific neighboring nodes, improving effectiveness without excessive complexity.
Solution Approach 2:
The patent introduces new measurement parameters including Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), and Signal to Interference plus Noise Ratio (SINR) specifically for CLI assessment. By changing the measurement parameter set to include these specialized metrics, the system achieves more effective CLI management while maintaining implementation compatibility with existing measurement frameworks.
3Measurement precision
If detailed CLI measurement and reporting is implemented, then interference coordination accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent implements partial measurement and reporting by focusing on the most critical CLI parameters (RSRP, RSRQ, SINR) and reporting only the necessary information for interference management decisions. This partial action approach provides sufficient measurement precision for effective coordination while avoiding the excessive overhead that would result from reporting every possible measurement detail.
Data Source
AI summary
Embodiments of the present disclosure describe methods and apparatuses for measurements and reports in integrated access and backhaul networks.