UE-to-UE Interference Measurement With Common Resource Pool Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently identifying and mitigating cross-link interference (CLI) between user equipment (UEs) due to differing time division duplexing (TDD) configurations in neighboring cells, leading to interference during overlapping transmission periods.
Innovation Solution
A common resource pool configuration is established for CLI measurements, with a bitmap indicating resources within the pool, allowing neighboring base stations to communicate measurement configurations and parameters, and UEs to report CLI measurements using reference signal received power (RSRP) and channel state information (CSI) mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different TDD configurations are used in neighboring cells to optimize transmission efficiency, then system productivity is improved, but cross-link interference between UEs increases
Solution Approach 1:
The system performs preliminary CLI measurements by having UEs measure reference signals transmitted by neighboring UEs before actual data transmission occurs. The gNB receives these measurement reports and uses them to determine appropriate TDD configurations and power control parameters in advance, preventing interference before it affects transmission efficiency.
Solution Approach 2:
The system establishes a feedback mechanism where UEs measure and report CLI levels to the gNB, which then adjusts TDD configurations and power parameters dynamically. This closed-loop feedback allows the system to optimize transmission efficiency while maintaining interference levels within acceptable thresholds.
2Measurement precision
If CLI measurements are performed for all possible resources to ensure accurate interference identification, then measurement precision is improved, but device complexity and measurement time increase
Solution Approach 1:
Instead of configuring uniform measurement parameters for all resources, the system applies local quality by allowing different TDD configurations and measurement parameters for different cells and resources based on their specific interference characteristics. The gNB configures CLI measurements with cell-specific and resource-specific parameters tailored to local interference conditions.
Solution Approach 2:
The system dynamically adjusts measurement configurations based on real-time network conditions. The gNB can modify measurement resources, periodicity, and parameters on-demand based on detected interference patterns, allowing the system to adapt measurement complexity to actual needs rather than using fixed comprehensive measurements.
3Measurement precision
If comprehensive CLI measurement configurations are provided to all UEs to ensure accurate measurements, then measurement precision is improved, but signaling overhead and backhaul communication load increase
Solution Approach 1:
The system segments the CLI measurement configuration into manageable components. Instead of providing complete measurement configurations to all UEs simultaneously, the gNB divides configurations into cell-specific parameters, resource-specific parameters, and dynamic adjustments. This segmentation allows selective information distribution based on UE location and measurement needs.
Solution Approach 2:
The gNB acts as an intermediary that processes and filters measurement configuration information before distributing it to UEs. It determines which measurement parameters are necessary for each UE based on its serving cell and neighboring cell configurations, reducing the information burden on UEs while maintaining measurement accuracy.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described which provide for efficient backhaul communications and identification of resources for cross-link interference (CLI) measurements and reporting. A common resource pool may be configured in which CLI measurements for resources within the resource pool have a common configuration. When providing information indicating resources that are to be measured for CLI, a bitmap that indicates resources within the common resource pool may be provided with CLI measurement configurations corresponding to the common resource pool configuration. Such a bitmap may be communicated via backhaul connections between neighboring base stations when initiating a CLI measurement. Various described techniques also provide for common configuration for CLI measurements, provide for efficient reporting of CLI measurements, and provide for accurate representation of CLI based on measurements at a victim UE.