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.Ope
