Sidelink L3 Filtering for Accurate V2X Measurement Reporting
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Solution Overview
Problem
Existing sidelink measurement methods in V2X communication face challenges due to the non-periodic transmission of reference signals, leading to inaccuracies in layer 3 filtering and measurement reporting, especially in 5G/NR systems.
Innovation Solution
Implementing a window-based approach for layer 3 filtering, where the UE applies different filter coefficients based on the timing of the latest and old measurement results, ensuring accurate measurement reporting by considering only recent measurements within a configured or preconfigured time window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional layer 3 filtering is applied to sidelink measurements, then measurement reporting is performed, but measurement accuracy deteriorates due to non-periodic reference signal transmission and outdated measurement data
Solution Approach 1:
The patent applies dynamic filtering by adjusting the filter coefficient 'a' based on the timing relationship between measurement results. When the time difference exceeds a threshold, the filter coefficient changes to give less weight to outdated measurements, dynamically adapting the filtering behavior to the actual measurement scenario to prevent outdated data from degrading accuracy
Solution Approach 2:
The patent performs preliminary assessment of measurement result validity by checking the time difference between current and previous measurements before applying filtering. This preliminary action identifies outdated measurements that would harm accuracy, allowing the system to take preventive measures by adjusting filter coefficients or excluding such measurements from reporting
2Quantity of substance
If all measurement results are included in filtering, then more data is available for reporting, but measurement accuracy deteriorates due to inclusion of outdated measurements
Solution Approach 1:
The patent applies different filtering qualities to different measurement results based on their timing characteristics. Recent measurements within the time window receive standard filtering treatment, while outdated measurements beyond the threshold are either excluded or given reduced weight, creating localized quality differentiation that preserves accuracy while managing data quantity
Solution Approach 2:
The patent changes the filter coefficient parameter 'a' dynamically based on the time difference between measurements. When measurements exceed the time threshold, the parameter adjustment reduces the influence of outdated data on the filtered result, thereby maintaining measurement precision even when multiple measurement results are considered
Data Source
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AI summary
Methods and apparatuses in a wireless communication system. A method of operating a user equipment (UE) includes storing a previous layer 3 (L3) filtered measurement result; receiving L3 filtering configuration information including a first filter coefficient value (k) and a first filtering window value; identifying a generation time instance of the previous L3 filtered measurement result; identifying the first filter coefficient value (k) and the first filtering window value included in the L3 filtering configuration information; in response to receiving a latest measurement result from a lower layer, determining whether the generation time instance of the previous L3 filtered measurement result was obtained within a time window that is a function of a first time instance and a second time instance; and performing an L3 filtering operation to trigger a measurement report based on a result of the determination.