Sidelink Interference Measurement Beyond Allocated Bandwidth
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Solution Overview
Problem
Existing sidelink wireless communication systems face challenges in accurately measuring interference on sidelink resources for channel state information (CSI) reporting, particularly in vehicle-to-everything (V2X) communication systems, which affect the quality of vehicle-to-vehicle and vehicle-to-infrastructure interactions.
Innovation Solution
Sidelink devices measure interference values on resources outside the allocated bandwidth of a sidelink carrier, identify channel quality indicators (CQIs) based on these measurements, and transmit CSI reports including the CQIs to other devices, using mechanisms such as RRC signaling, preconfigured resources, or autonomous selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interference measurement is performed only within the allocated bandwidth of a sidelink carrier, then the measurement scope is limited and processing is simpler, but the accuracy of CSI reporting is insufficient to reflect actual interference conditions
Solution Approach 1:
The patent extends interference measurement from the traditional one-dimensional approach (within allocated bandwidth only) to a two-dimensional approach by introducing measurement in the frequency domain outside the allocated bandwidth. This dimensional expansion allows the receiver to capture interference information from adjacent carrier resources, providing a more comprehensive view of the actual interference environment and thereby improving CSI reporting accuracy without excessive complexity increase
2Measurement precision
If interference measurement resources are configured outside the allocated bandwidth, then interference measurement accuracy improves, but the complexity of resource configuration and signaling increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring interference measurement resources outside the allocated bandwidth through higher-layer signaling (RRC configuration) before actual communication begins. The network side device预先 configures the receiver with the appropriate resource settings, allowing the receiver to automatically perform interference measurement without complex real-time configuration decisions, thus reducing operational complexity while maintaining measurement accuracy
Solution Approach 2:
The patent implements feedback mechanisms where the receiver measures interference on the configured resources and reports the results back to the network side device. This feedback loop allows the network to adjust resource allocation and configuration parameters dynamically, simplifying the overall system operation while maintaining accurate interference measurement. The feedback mechanism transforms complex configuration requirements into manageable iterative optimization
Data Source
AI summary
Aspects relate to mechanisms for measuring the interference on the sidelink for use in calculating the channel quality indicator (CQI) in channel state information (CSI) reporting. Channel state information-interference measurement (CSI-IM) resources on which a sidelink device may measure the interference may be located outside of a bandwidth allocated for the transmission of a physical sidelink shared channel (PSSCH) and/or inside of the allocated bandwidth. The sidelink device may measure respective interference values on one or more CSI-IM resources, identify one or more CQI(s) based on the measured interference value(s) and transmit one or more CSI reports including the one or more CQIs to another sidelink device.