Proactive Eavesdropping Performance for Integrated Satellite–Terrestrial Relay Networks

This work investigates the proactive eavesdropping based legitimate surveillance for integrated satellite-terrestrial relay networks with multiple proactive monitors. To study the eavesdropping non-outage probability, we propose three different presentative proactive eavesdropping cases/modes, where the legitimate monitors could change its roles between eavesdropping and jamming, namely, Case I: Eavesdropping then Jamming, Case II: Jamming then Eavesdropping, Case III: Always Eavesdropping. Particularly, we get the accurate expressions of the eavesdropping non-outage probability for the proposed three proactive eavesdropping modes in the presence of multiple monitors. To derive further insights, we provide the asymptotic analysis of the three eavesdropping non-outage probabilities. Besides, the colluding proactive eavesdropping scenario is considered, in which all the monitors cooperate to overhear or jam the legitimate users. Finally, numerical results are obtained to verify the rightness of the analytical analysis.