Safeguarding UAV-Enabled Wireless Power Transfer Against Aerial Eavesdropper: A Colonel Blotto Game

This letter considers an unmanned aerial vehicle (UAV)-enabled wireless power transfer (WPT) system in the presence of an aerial eavesdropper (ARE), which is able to launch the attacks by allocating the false signaling transfer channels to the ground devices (GDs). To defend against such attacks, we design an asymmetric Colonel Blotto (CB) game framework to formulate the competitive channel allocation problem for the UAV as a defender and the ARE as an attacker. The competitive interaction between the defender and the attacker in their channel allocations to the GDs is modeled as the competition of two players in the CB game for limited resources over a finite set of battlefields. In addition, we derive the mixed-strategy Nash equilibrium solution to the game for the asymmetric resources between two players. As results, we show that the proposed game framework achieves considerable performance gains for the expected total payoff that the defender receives across the battlefield set compared to the baseline schemes.