CLI-RS Beam Measurement for Full-Duplex Terminal Interference
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Solution Overview
Problem
In full-duplex communication systems, there is a challenge of cross-linked interference (CLI) between terminals due to simultaneous uplink and downlink signals using the same frequency resource, which hinders effective signal transmission and reception.
Innovation Solution
A method and device for measuring cross-linked interference-reference signals (CLI-RS) to determine optimal beams for data transmission and reception, involving resource allocation, measurement, and co-scheduling to minimize interference between terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communication is implemented to improve spectral efficiency, then uplink and downlink can simultaneously use the same frequency resource, but cross-linked interference occurs between terminals
Solution Approach 1:
The patent applies preliminary action by performing interference measurement using CLI-RS signals before actual data transmission. The base station pre-configures resource allocations for CLI-RS, and terminals pre-measure interference levels from other terminals. This advance measurement allows the system to identify interference-prone terminal pairs before they engage in simultaneous full-duplex communication, enabling proactive interference management through co-scheduling decisions.
2Productivity
If simultaneous uplink and downlink transmission is enabled to increase data rate, then spectral efficiency improves, but interference measurement and management becomes more complex
Solution Approach 1:
The patent introduces CLI-RS (cross-linked interference reference signal) as an intermediary element to simplify interference measurement. Instead of requiring terminals to directly measure and report complex interference conditions, the system uses dedicated CLI-RS signals that terminals can easily detect and measure. These reference signals act as mediators that carry interference information from transmitting terminals to receiving terminals in a standardized, measurable format, reducing the complexity of interference assessment.
Solution Approach 2:
The patent implements feedback mechanisms where terminals measure CLI-RS signals and report interference measurements to the base station. The base station collects feedback from multiple terminals about their respective interference levels, then uses this feedback information to make co-scheduling decisions. This feedback loop enables the system to adaptively manage interference based on real-time measurements while maintaining full-duplex operation.
3Length of stationary object
If beamforming is used to improve coverage in terahertz band, then signal transmission distance increases, but interference between beams may increase
Solution Approach 1:
The patent applies local quality by performing interference measurement and co-scheduling at the terminal level rather than system-wide. Each terminal measures CLI-RS from specific interfering terminals and reports local interference conditions. The base station then makes granular co-scheduling decisions for specific terminal pairs, allowing interference management to be tailored to local conditions. This localized approach enables beamforming to maintain long transmission distances while managing interference on a per-terminal-pair basis.
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to various embodiments of the present disclosure, a method performed by a terminal supporting a full-duplex (FD) system in a wireless communication system may comprise the steps of: receiving, from a base station, an allocation of resources for receiving at least one cross-linked interference-reference signal (CLI-RS); determining, on the basis of the allocated resources, at least one CLI-RS reception beam from among a plurality of available beams; receiving, from at least one other terminal, a CLI-RS on the basis of the at least one CLI-RS reception beam; measuring interference with the at least one other terminal on the basis of the received CLI-RS; transmitting, to the base station, measurement information generated on the basis of the measurement result; receiving, from the base station, joint scheduling information on the basis of a downlink reception beam determined on the basis of the measurement information; and receiving, from the base station, a downlink signal through the downlink reception beam determined on the basis of the joint scheduling information.