  In this letter, we propose three schemes designed to detect attacks over the
air interface in cellular networks. These decision rules rely on the
generalized likelihood ratio test, and are fed by data that can be acquired
using common off-the-shelf receivers. In addition to more classical
(barrage/smart) noise jamming attacks, we further assess the capability of the
proposed schemes to detect the stealthy activation of a rogue base station. The
evaluation is carried out through an experimentation of a LTE system concretely
reproduced using Software-Defined Radios. Illustrative examples confirm that
the proposed schemes can effectively detect air interface threats with high
probability.
