Precoded Reference Signals for Victim-UE CLI and Adaptive Precoding
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Solution Overview
Problem
Wireless communications systems face challenges in managing cross-link interference (CLI) effectively, which can degrade spectral efficiency, increase power consumption, and reduce user equipment (UE) performance.
Innovation Solution
The method involves configuring an aggressor UE to transmit precoded reference signals (RS) for CLI measurement by a victim UE, and the victim UE measures and reports the CLI based on these signals, allowing the network to generate precoding configurations that reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precoded reference signals are transmitted for CLI measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The aggressor UE transmits precoded reference signals in advance before actual data transmission occurs. This preliminary action allows the victim UE to measure CLI conditions ahead of time, enabling the network to configure appropriate precoding matrices that will mitigate interference during subsequent data transmission, thus resolving the measurement precision versus complexity contradiction by performing measurements proactively rather than reactively
Solution Approach 2:
The victim UE measures the precoded reference signals and feeds back CLI measurement results to the network entity. This feedback mechanism enables the network to adaptively select precoding configurations that optimize interference management. The feedback loop transforms the system from open-loop to closed-loop operation, allowing continuous optimization of CLI mitigation strategies based on actual measured conditions
2Productivity
If full duplex operation is implemented, then productivity is improved, but harmful factors increase
Solution Approach 1:
The patent converts the harmful CLI effect into a beneficial measurement opportunity by having the aggressor UE transmit dedicated reference signals that intentionally expose the interference path. The victim UE measures these signals to characterize the CLI channel, and this information is then used to configure precoding that actually mitigates the interference during data transmission. Thus, the harmful interference is transformed into useful channel state information for optimization
Solution Approach 2:
The system dynamically adjusts precoding parameters (precoding matrices) based on measured CLI conditions. The network entity selects appropriate precoding configurations from codebooks and signals them to the aggressor UE, changing the transmission parameters adaptively to optimize the balance between productivity and interference management in full duplex operation
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for wireless communication by an aggressor user equipment (UE), generally including receiving configuration information configuring the aggressor UE with at least one resource for transmitting precoded reference signals (RS) for cross link interference (CLI) measurement by a victim UE and transmitting the precoded RS on the resource.