CLI Reference Signal Grouping for Full-Duplex Interference Measurement
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Solution Overview
Problem
In full-duplex communication systems, cross-link interference (CLI) occurs when uplink and downlink signals use the same frequency resource, leading to interference between terminals, which current technologies struggle to efficiently measure and manage, resulting in overhead and reduced signal quality.
Innovation Solution
A method and apparatus for configuring cross-link interference reference signals (CLI-RS) to minimize overhead by grouping terminals for efficient CLI measurement, involving a base station identifying terminals, transmitting configuration information, and receiving measurement results from terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CLI measurement is performed in full-duplex systems using conventional methods, then interference measurement capability is provided, but measurement overhead increases and signal quality deteriorates
Solution Approach 1:
The patent segments the resource allocation by introducing separate CLI-RS resources distinct from uplink and downlink data resources. This segmentation allows independent measurement of cross-link interference without affecting data transmission resources, thereby reducing measurement overhead while maintaining measurement capability
Solution Approach 2:
The patent introduces CLI-RS as an intermediary reference signal that facilitates interference measurement between uplink and downlink transmissions. This intermediary signal enables accurate CLI measurement without requiring direct measurement of interfering data signals, reducing overhead while preserving measurement precision
2Productivity
If same frequency resource is used for uplink and downlink transmissions, then spectral efficiency improves, but cross-link interference occurs between terminals
Solution Approach 1:
The patent extracts the interference measurement function from the data transmission resources by introducing dedicated CLI-RS resources. This extraction allows the system to maintain frequency-division multiplexing for data transmission (preserving spectral efficiency) while separately measuring cross-link interference through dedicated reference signals
Solution Approach 2:
The patent implements a feedback mechanism where measurement results of CLI-RS are reported to the base station, which then adjusts resource allocation and power control parameters. This feedback loop enables the system to maintain high spectral efficiency by dynamically managing cross-link interference based on real-time measurements
3Measurement precision
If CLI-RS resources are allocated without grouping, then individual terminal measurement accuracy is maintained, but overall system overhead increases
Solution Approach 1:
The patent merges multiple CLI-RS resources into groups that can be shared among multiple terminals. By combining resources with similar interference characteristics, the system maintains measurement accuracy for each terminal while reducing the total number of resources required, thereby lowering overall system overhead and allocation complexity
Data Source
AI summary
The disclosure relates to a 5th generation (5G) communication system or a 6th generation (6G) communication system for supporting higher data rates beyond a 4th generation (4G) communication system such as long term evolution (LTE). A method performed by a base station in a wireless communication system is provided. The method includes identifying a first terminal for measuring a cross-link interference (CLI)-reference signal (RS) and a plurality of terminals for transmitting CLI-RSs, determining a plurality of groups including at least one CLI-RS resource, transmitting, to the first terminal, information on the determined plurality of groups, transmitting, to a second terminal among the plurality of terminals, configuration information on a group of CLI-RS resources corresponding to the second terminal, and receiving, from the first terminal, a CLI measurement result which is measured based on the configuration information on the group of the CLI-RS resources.