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Author(s):Guan, Junfeng
Contributor(s):Gong, Songbin
Subject(s):Privacy protections
Network-based localization
Location spoofer
Observed time difference of arrival (OTDOA)
Abstract:Mobile phones can locate users' location through multiple methods. Even through privacy-conscious users can disable location services such as GPS and Wi-Fi access points, they are not able to prevent the leakage of location information through cellular based positioning. In this paper, Ventrilocation is presented. It is an RF dongle that provides location-spoofing service for LTE-enabled devices while preserving full voice and data functionality. Specifically, it affects the raw data and results of a standard multilateration positioning method in LTE networks, known as observed time difference of arrival (OTDOA). OTDOA measures the difference between the arrival time of signals from different base stations to obtain the relative location of the user equipment (UE) to the base stations. Ventrilocation changes the time difference of arrival (TDOA) by introducing different delays to signals from different base stations. It consists of directional antennas to isolate signals and a circuit to delay the downlink signals. The surface acoustic wave (SAW) technology allows a chip-size delay line component to generate a significant amount of delay in the LTE frequency bands. The first prototype of Ventrilocation uses SAW delay lines with fixed delay, but with programmable SAW delay lines, the spoofed location can be designed to follow certain routes to achieve more reliable spoofing results.
Issue Date:2017-05
Date Available in IDEALS:2017-08-18

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