  False Base Station (FBS) attack has been a severe security problem for the
cellular network since 2G era. During handover, the user equipment (UE)
periodically receives state information from surrounding base stations (BSs)
and uploads it to the source BS. The source BS compares the uploaded signal
power and shifts UE to another BS that can provide the strongest signal. An FBS
can transmit signal with the proper power and attract UE to connect to it. In
this paper, based on the 3GPP standard, a Precheck Sequence-based Detection
(PSD) Scheme is proposed to secure the transition of legal base station (LBS)
for UE. This scheme first analyzes the structure of received signals in blocks
and symbols. Several additional symbols are added to the current signal
sequence for verification. By designing a long table of symbol sequence, every
UE which needs handover will be allocated a specific sequence from this table.
The simulation results show that the performance of this PSD Scheme is better
than that of any existing ones, even when a specific transmit power is designed
for FBS.
