Cross-link interference measurement in subband full-duplex systems
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Solution Overview
Problem
Current wireless communication systems, particularly 5G NR, face challenges in effectively measuring and managing inter-UE cross-link interference (CLI) during subband full-duplexing (SBFD) operations, which affects signal quality and network performance.
Innovation Solution
A method where a UE receives a measurement configuration from a base station to measure CLI using specific resources such as CSI-IM/ZP CSI-RS, reference signals, or guardband resources, and reports the measured interference back to the base station, allowing for informed resource scheduling and link adaptation to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If subband full-duplexing (SBFD) operations are implemented to improve spectral efficiency and network capacity, then productivity is improved, but inter-UE cross-link interference (CLI) occurs which deteriorates signal quality and reliability
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures CLI on downlink resources and reports the measured interference back to the base station. The base station uses this feedback information to adjust scheduling decisions, power allocation, and resource assignment to mitigate the interference while maintaining SBFD operations
Solution Approach 2:
The patent introduces an intermediary measurement and reporting mechanism that acts as a mediator between the interfering UE and the affected UE. The CLI measurement configuration and reporting structure serve as an intermediary system that enables the base station to detect and manage interference without direct UE-to-UE communication
2Productivity
If SBFD operations are implemented to increase network capacity, then productivity is improved, but signal quality deteriorates due to inter-UE cross-link interference
Solution Approach 1:
The UE performs CLI measurements on configured downlink resources and reports the measured interference levels to the base station. This feedback loop enables the base station to make informed decisions about resource allocation and power control to maintain signal quality while preserving network capacity
Solution Approach 2:
The base station adjusts operational parameters such as scheduling decisions, power allocation, and resource assignment based on CLI measurement reports. These parameter changes allow dynamic optimization to maintain signal quality while sustaining high network capacity through SBFD
3Reliability
If CLI measurement and reporting mechanisms are implemented to reduce interference, then reliability is improved, but device complexity increases due to additional measurement and reporting requirements
Solution Approach 1:
The patent segments the CLI measurement process into distinct configurable components: measurement configuration parameters, resource allocation specifications, and reporting formats. This segmentation allows flexible activation and configuration of only the necessary measurement and reporting elements, reducing overall device complexity while maintaining reliable interference management
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus is a UE. The UE receives, from a base station, a measurement configuration for measuring cross-link interference (CLI) in a subband full-duplexing (SBFD) slot and a reporting configuration for reporting the CLI. The UE performs measurements of the CLI on measurement resources indicated by the measurement configuration. The UE reports an indication of the measured CLI to the base station according to the reporting configuration.