Connected Mode Jamming Detection in CDMA User Equipment
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Solution Overview
Problem
Current anti-jamming solutions for CDMA-based radio networks are inadequate as they rely on sophisticated signal strength measurements and are limited to detecting jamming situations in idle mode, failing to prevent jamming attacks effectively, especially in UMTS standards where frequent interferences are common.
Innovation Solution
A method and device that detect jamming transmitters in a connected mode by generating synchronization indications from power monitoring of dedicated physical channels, evaluating these indications using timers and counters, and measuring Layer-1 parameters to indicate a jamming situation, allowing for early detection and prevention before the user equipment falls into idle mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization indications are generated from power monitoring of dedicated physical channels in connected mode, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by continuously monitoring power levels on dedicated physical channels during connected mode before actual jamming occurs. The system evaluates synchronization indications and accumulates out-of-sync indications in advance, enabling early detection and transition to idle mode before service loss happens.
Solution Approach 2:
The patent implements feedback mechanisms by continuously evaluating synchronization indications from power monitoring and using this information to control mode transitions. The system provides feedback loops where out-of-sync indications are accumulated and evaluated against thresholds to trigger appropriate responses, improving detection reliability through continuous monitoring and adjustment.
2Duration of action of moving object
If detection is performed in connected mode during active calls, then service continuity is improved, but false detection from normal interference increases
Solution Approach 1:
The patent applies partial action by not requiring complete loss of synchronization to trigger detection. Instead, it accumulates multiple out-of-sync indications over time, using a threshold-based approach where only sustained synchronization failures trigger jamming detection. This filters out transient interference while maintaining service continuity during normal operation.
Solution Approach 2:
The patent changes the detection parameter from immediate synchronization loss to accumulated out-of-sync indication counts. By monitoring the number and duration of synchronization failures rather than reacting to single events, the system distinguishes between normal temporary interference and sustained jamming attacks, improving detection accuracy during active calls.
3Measurement precision
If sophisticated signal strength measurements are used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent applies self-service by utilizing existing power monitoring functions already present in the user equipment for dedicated physical channels. The system repurposes these existing measurements for jamming detection without requiring additional complex measurement hardware or procedures, maintaining ease of operation while achieving precise detection through intelligent evaluation of available data.
Data Source
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AI summary
Method of detecting a jamming transmitter, affecting a communication user equipment, wherein said communication user equipment (UE) is adapted for communication with a component of a cellular code division multiple access (CDMA) based radio network (RN) having a number of user equipments (UE) and a number of base node stations (BNS), providing the user equipment (UE) in a connected mode of a communication radiolink with the component of the radio network (RN) wherein in the connected mode of said user equipment (UE) jamming detection steps are provided.