  In this paper, we propose a secure computation offloading scheme (SCOS) in
intelligently connected vehicle (ICV) networks, aiming to minimize overall
latency of computing via offloading part of computational tasks to nearby
servers in small cell base stations (SBSs), while securing the information
delivered during offloading and feedback phases via physical layer security.
Existing computation offloading schemes usually neglected time-varying
characteristics of channels and their corresponding secrecy rates, resulting in
an inappropriate task partition ratio and a large secrecy outage probability.
To address these issues, we utilize an ergodic secrecy rate to determine how
many tasks are offloaded to the edge, where ergodic secrecy rate represents the
average secrecy rate over all realizations in a time-varying wireless channel.
Adaptive wiretap code rates are proposed with a secrecy outage constraint to
match time-varying wireless channels. In addition, the proposed secure
beamforming and artificial noise (AN) schemes can improve the ergodic secrecy
rates of uplink and downlink channels even without eavesdropper channel state
information (CSI). Numerical results demonstrate that the proposed schemes have
a shorter system delay than the strategies neglecting time-varying
characteristics.
