CDMA Jamming Detection via Dynamic Power Parameter Comparison
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Solution Overview
Problem
Current anti-jamming solutions for CDMA-based radio networks are inadequate in distinguishing between normal frequency disturbances and jamming or out-of-service situations, as they rely on predefined threshold values and are not suited for the dynamic nature of CDMA technology, where broadband interference is a common state of operation.
Innovation Solution
A method that measures and compares power parameters at two different times to differentiate between jamming and out-of-service situations by verifying the detectability of biased and unbiased parameters, using a pseudonoise spread code and wideband power measurements to determine if a jamming transmitter is present or if the user equipment is experiencing an out-of-service condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If predefined threshold values are used for jamming detection, then the detection process is simple, but the reliability of detection is insufficient in dynamic CDMA environments
Solution Approach 1:
The patent changes from using fixed predefined threshold values to using dynamically determined thresholds based on measured power parameters (Ec/Io ratio, RSCP, RTWP) at different times. The threshold adapts to the changing CDMA environment by comparing current measurements with historical measurements, thereby improving detection reliability while maintaining operational simplicity.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously measures power parameters, compares them with previous measurements, and adjusts the detection decision based on the change direction. The evaluation unit uses the feedback from time t1 measurements to determine the threshold for t2 measurements, creating a self-adjusting detection system that improves reliability.
2Measurement precision
If broadband interference detection is implemented in CDMA networks, then jamming detection capability is improved, but the ability to distinguish from normal operation disturbances is reduced
Solution Approach 1:
The patent applies dynamics by measuring power parameters at two different times (t1 and t2) and comparing the direction of change. Normal CDMA operation shows relatively stable or predictably changing parameters, while jamming causes abrupt changes in both Ec/Io and RTWP. This dynamic comparison approach improves jamming detection while maintaining the ability to distinguish it from normal operational variations.
Solution Approach 2:
The patent segments the detection process into multiple independent measurement components: Ec/Io ratio measurement, RSCP measurement, and RTWP measurement. By analyzing the combined behavior of these segmented measurements rather than relying on a single broadband metric, the system achieves both precise jamming detection and accurate disturbance type discrimination.
3Measurement precision
If multiple power parameters are measured and compared at different times, then the accuracy of disturbance discrimination is improved, but the device complexity increases
Solution Approach 1:
The patent makes the measurement system multi-functional by using the same measurement infrastructure to simultaneously obtain Ec/Io ratio, RSCP, and RTWP values. The evaluation unit performs multiple functions: it measures current parameters, compares them with historical values, determines change directions, and makes detection decisions. This universal approach improves discrimination accuracy without proportionally increasing device complexity.
Data Source
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AI summary
The invention relates to a method of detecting a jamming transmitter affecting a communication user equipment, wherein said communication user equipment (UE) and a number of base node stations (BNS) are components of a cellular code division multiple access (CDMA) based radio network (RN), wherein: a communication signal unit (SU) is correlated with a pseudonoise spread code (SC) in a serving cell coverage area (CA) of a serving base node station (sBNS) and transmitted as a pseudonoise chip (CHI) in a multiple shared communication frequency channel spectrally located between an upper frequency and a lower frequency of a communication frequency band (FB I-XIX) and the pseudonoise spread code (SC) is received by the communication user equipment (UE) as a serving pseudonoise spread code (sSC) from said serving base node station (BNS) in a serving downlink channel (sCPICH).