NR Duplex Subband CLI Sensing for Dynamic Interference Mitigation
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively mitigating interference in NR-duplex environments, particularly due to cross-link interference (CLI) which affects the efficiency and coverage of wireless data transmission.
Innovation Solution
Implementing subband-wise channel and interference sensing at the victim WTRU, subband avoidance reporting, and directional CLI sensing and measurement, along with transmission yielding at the aggressor WTRU, to manage and mitigate CLI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If subband-wise CLI measurements are performed across multiple sub-bands, then interference mitigation capability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands and performs CLI measurements independently for each sub-band. This allows the system to identify specific sub-bands experiencing interference and switch to alternative sub-bands, improving interference mitigation while managing complexity through localized rather than global measurements.
Solution Approach 2:
The patent applies different measurement and processing strategies to different sub-bands based on their individual interference characteristics. Victim WTRUs perform measurements on specific sub-bands where interference is detected, and aggressor WTRUs transmit reference signals on sub-bands identified as requiring monitoring, allowing localized optimization without system-wide complexity.
2Loss of time
If frequent CLI measurements are performed to detect interference quickly, then response time to interference is improved, but energy consumption and processing load increase
Solution Approach 1:
The patent implements periodic CLI measurements where victim WTRUs measure CLI on configured sub-bands at regular intervals, and aggressor WTRUs transmit SRS reference signals periodically. This periodic approach ensures timely detection of interference while allowing the system to enter lower-power states between measurement occasions, balancing response time with energy consumption.
3Measurement precision
If directional CLI sensing is implemented to identify specific interference sources, then interference localization accuracy is improved, but device complexity and measurement overhead increase
Solution Approach 1:
The patent implements asymmetric directional sensing where aggressor WTRUs transmit reference signals in specific directions using beamforming, and victim WTRUs measure CLI from these directional transmissions. This asymmetric approach allows precise identification of interference sources through the spatial characteristics of the transmitted signals without requiring full bidirectional directional capabilities at both ends.
Data Source
AI summary
A wireless transmit/receive unit (WTRU) may include a processor that is configured to receive configuration information indicating a plurality of sub-bands for cross-link interference (CLI) measurements and respective resources for performing CLI measurements for each of the plurality of sub-bands. The processor may receive a downlink control information (DCI) indicating resources associated with a first reference sub-band. The processor may perform a CLI measurement for the first reference sub-band using one or more resources for performing CLI measurements for the first sub-band. The processor may perform a CLI measurement for at least one other sub-band of the plurality of sub-bands using the respective resources for CLI measurements of the at least one other sub-band based on determining that the CLI measurement for the first sub-band is greater than a threshold. The processor may send an indication that the CLI measurement for the sub-band is greater than the threshold.