Earliest Signal Change Detection for Relay Attack Timing
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Solution Overview
Problem
Existing wireless transmission systems lack precise time synchronization and are vulnerable to relay attacks, with existing methods failing to accurately detect signal changes and adapt to varying transmission conditions.
Innovation Solution
A method for determining the earliest reception of a signal change by analyzing sampling values across multiple symbols or chips, allowing for precise time synchronization and defense against relay attacks without modifying existing transmission systems like UMTS, LTE, or Bluetooth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal sampling is performed in smaller and more precise steps to improve time resolution, then measurement precision is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent performs preliminary aggregation of sampling values across multiple symbols or chips before detecting signal changes. By pre-processing and accumulating samples in advance, the system achieves high time resolution without requiring extremely fine sampling steps, thus reducing the complexity burden while maintaining measurement precision.
Solution Approach 2:
Instead of improving time resolution solely through finer time sampling, the patent introduces a new dimension by aggregating samples across multiple symbols or chips (adding a temporal accumulation dimension). This dimensional approach allows achieving high precision through statistical aggregation rather than purely temporal refinement, reducing the burden on sampling rate and processing complexity.
2Measurement precision
If conventional time synchronization methods are used, then system compatibility is maintained, but time synchronization accuracy and relay attack detection capability are insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the receiver detects the earliest signal change time with high precision and feeds this information back to detect abnormal delays. By continuously monitoring the actual signal arrival time against expected timing, the system can identify relay attacks that introduce abnormal time delays, thus improving both synchronization accuracy and security without compromising compatibility.
Solution Approach 2:
The patent changes the detection parameter from conventional signal amplitude or phase detection to earliest signal change time detection. By focusing on the precise timing of the first signal change rather than traditional modulation parameters, the system achieves higher time synchronization accuracy and creates a new dimension for detecting relay attacks, which manifest as abnormal time delays.
3Reliability
If the focus is on decoding information from the center part of symbol period, then robustness to multi-path effects is improved, but time synchronization precision is limited
Solution Approach 1:
The patent performs preliminary aggregation of sampling values across multiple symbols or chips before detecting signal changes. By pre-processing and accumulating samples in advance, the system achieves high time resolution without requiring extremely fine sampling steps, thus reducing the complexity burden while maintaining measurement precision.
Solution Approach 2:
Instead of improving time resolution solely through finer time sampling, the patent introduces a new dimension by aggregating samples across multiple symbols or chips (adding a temporal accumulation dimension). This dimensional approach allows achieving high precision through statistical aggregation rather than purely temporal refinement, reducing the burden on sampling rate and processing complexity.
Data Source
AI summary
The present invention relates to detecting the time of the earliest reception of a signal change. In particular, the method according to the invention allows early detection of the signal change, which significantly reduces the timespan available for an undetected relay attack and can thus prevent such an attack or at least make it significantly more difficult, without the data transmission systems that consist of the transmission technology, such as UMTS, LTE, or Bluetooth, having to be modified for this purpose or ultra-wideband signals being required. The object is achieved in that the earliest time at which there is a statistically significant signal change is selected as the time of the earliest reception, wherein the threshold of the statistical significance is determined from the signal itself.