Jamming Transmitter Detection in TDD Cellular Networks
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Solution Overview
Problem
Current methods fail to reliably distinguish between jamming transmitters and normal out-of-service situations in time-division cellular networks, where uplink and downlink communications share the same frequency band, making it difficult to detect jamming attacks affecting communication user equipment.
Innovation Solution
A method involving signal level measurements and pattern analysis to differentiate between jamming transmitters and normal out-of-service conditions by detecting a specific pattern of signal level changes over successive time units, specifically a threshold exceeding followed by a threshold below, in time-division cellular networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal level measurement is performed in TDD networks to detect jamming, then jamming detection capability is improved, but false detection in normal out-of-service situations increases
Solution Approach 1:
The patent applies periodic action by measuring signal levels in specific periodic time units (downlink time units versus uplink time units) within the TDD frame structure. By measuring during downlink time units when the UE should receive signals from the base station, and comparing against uplink time units, the method creates a periodic measurement pattern that distinguishes jamming from normal out-of-service conditions. This periodic measurement approach allows the system to detect abnormal signal patterns that indicate jamming while avoiding false detections during normal network unavailability.
Solution Approach 2:
The patent employs parameter changes by utilizing the time-domain characteristics of TDD networks, specifically changing the measurement parameter from simple signal presence/absence to signal level measurements across different time unit types (downlink vs uplink). By analyzing the pattern of signal levels across multiple successive time units and comparing against threshold values, the system dynamically adjusts detection parameters to differentiate between jamming scenarios (where abnormal signal patterns occur) and normal out-of-service situations (where no such patterns exist).
2Speed
If simple signal level threshold detection is used, then detection speed is improved, but detection accuracy deteriorates due to inability to distinguish jamming from normal out-of-service
Solution Approach 1:
The method uses periodic measurement across successive time units with different directions (downlink and uplink) to create a detection pattern that maintains speed while improving accuracy. By systematically measuring in periodic intervals and analyzing the pattern rather than relying on a single measurement, the system achieves both rapid detection and accurate differentiation between jamming and normal out-of-service conditions.
Solution Approach 2:
The patent implements feedback by continuously monitoring signal levels across multiple time units and using the pattern recognition results to confirm or refute jamming detection. The system analyzes whether the measured signal levels follow the expected pattern for normal operation or deviate in a manner consistent with jamming, providing feedback that improves detection accuracy without significantly increasing detection time.
Data Source
AI summary
A method for detecting a jamming transmitter affecting a communication user equipment,operating in a cellular network supporting communication in a time-division manner, including at least one active base station, on which the user equipment is camping.In the method, the user equipmentdetects that at least one downlink radio channel from the active base station is not decodable,measures signal levels received on said downlink radio channel for a plurality of time units,analyzes said signal level measurements, andin case at least one time unit is detected with a signal level exceeding a predefined threshold,detects a jamming transmitter by verifying that, in a predefined amount of successive time units, the pattern of a first time unit with signal level exceeding the predefined threshold, directly followed by a second time unit with a signal level below the predefined threshold, is not detected.