False Base Station Detection via Dual Positioning Cross-Validation

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Solution Overview

Problem

Existing wireless communication systems face challenges in detecting false base stations (FBS), which can disrupt communication by mimicking legitimate base stations, leading to handover failures and denial-of-service attacks.

Innovation Solution

A method and apparatus for detecting potential FBS by obtaining first and second location estimates using cellular and non-cellular network-based positioning procedures, respectively, and determining if the difference between these estimates exceeds a distance threshold, triggering mitigation operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If cellular network-based positioning procedure is used to detect FBS, then network security is improved, but positioning accuracy may be compromised due to FBS interference

Engineering Contradiction:

Improvenetwork securityVSAvoidpositioning accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent introduces a non-cellular positioning system (GPS, GLONASS, Galileo, or BeiDou) as an intermediary reference to verify the accuracy of cellular-based positioning. This mediator allows the system to detect discrepancies caused by FBS without completely abandoning the cellular positioning method, thus maintaining network security while improving positioning accuracy through cross-validation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If dual positioning procedures are implemented, then positioning accuracy is improved, but device complexity increases

Engineering Contradiction:

Improvepositioning accuracyVSAvoidpositioning system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent leverages the fact that modern mobile devices already contain both cellular communication capabilities and GNSS receivers for navigation purposes. By making the GNSS positioning capability serve the additional function of FBS detection, the system achieves improved positioning accuracy without significantly increasing device complexity, as the hardware is already present for other purposes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If location estimates are continuously monitored, then FBS detection capability is improved, but energy consumption increases

Engineering Contradiction:

ImproveFBS detection capabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic monitoring of location estimates rather than continuous monitoring. The system compares cellular-based and non-cellular-based positioning results at intervals, triggering FBS detection only when discrepancies exceed a threshold. This periodic approach maintains effective FBS detection capability while significantly reducing energy consumption compared to continuous monitoring.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS12317081B2Using positioning techniques to detect false base stations

Publication Date: 2025.05.27 QUALCOMM INC

AI summary

Disclosed are techniques for detecting a potential false base station (FBS). In an aspect, a user equipment (UE) or a location server obtains a first location estimate of the UE based on a cellular network-based positioning procedure involving one or more cells, obtains a second location estimate of the UE based on a non-cellular network-based positioning procedure, determines whether or not a difference between the first location estimate and the second location estimate is greater than a distance threshold, and performs a mitigation operation based on the difference being greater than the distance threshold.