Enhancing Secured Coverage With CoMP Transmission in Heterogeneous Cellular Networks

This letter addresses the problem of secured coverage under the concept of physical layer security in heterogeneous cellular networks operating with coordinated multipoint transmission (CoMP). A dynamic CoMP scheme for the legitimate users is proposed to enhance secured coverage. A performance analysis of secured coverage probability (SCP) is conducted for the proposed scheme, considering co-channel interference and the most threatening eavesdroppers. Numerical and simulation results are provided along with the no-CoMP scheme. It is revealed that with a proper base station selection threshold, the proposed CoMP scheme improves the SCP performance compared with the no-CoMP scheme (23.5% on average according to simulation results), and shows superiority in resisting more eavesdroppers as well.