NR Duplex Subband Sensing for Cross-Link 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 reliability of data transmission.
Innovation Solution
Implementing subband-wise channel and interference sensing at the victim WTRU, followed by subband avoidance reporting, and transmission switching at the aggressor WTRU, along with directional CLI sensing and measurement to manage interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If subband-wise channel and interference sensing is implemented at the victim WTRU, then interference mitigation capability is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent divides the wideband channel into multiple subbands and performs independent CLI sensing and measurement on each subband. This segmentation allows the victim WTRU to identify specific subbands affected by interference and report only those, rather than processing the entire bandwidth, thus improving interference mitigation while reducing overall processing complexity.
Solution Approach 2:
The patent applies different measurement and reporting strategies to different subbands based on their interference characteristics. Subbands with high CLI are identified and reported separately, allowing the network to apply targeted interference mitigation resources only where needed, rather than uniformly across the entire bandwidth.
2Reliability
If subband avoidance reporting after sensing (ARAS) is implemented, then interference mitigation effectiveness is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and reports only the specific subband indices that are affected by CLI, rather than reporting all subband information. This selective reporting approach maintains interference mitigation effectiveness by identifying problematic subbands while significantly reducing the signaling overhead compared to comprehensive subband reporting.
3Object-generated harmful factors
If transmission yielding after sensing is implemented at the aggressor WTRU, then CLI reduction is improved, but productivity and data transmission efficiency decrease
Solution Approach 1:
The patent implements dynamic transmission yielding where the aggressor WTRU adjusts its transmission behavior based on real-time CLI sensing results. Instead of static transmission patterns, the system dynamically yields transmission in subbands identified as causing interference to victims, while maintaining transmission in clean subbands, thus reducing CLI while preserving overall data transmission efficiency.
4Measurement precision
If directional CLI sensing and measurement are implemented, then interference localization accuracy is improved, but measurement complexity and processing requirements increase
Solution Approach 1:
The patent segments the interference measurement process into directional components, measuring CLI from different spatial directions separately. This allows precise localization of interfering signals by identifying their directional origins, while the segmented approach keeps measurement complexity manageable by focusing on specific directions rather than performing exhaustive omnidirectional measurements.
Data Source
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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.