Privacy-Aware Laser Wireless Power Transfer for Aerial Multi-Access Edge
Computing: A Colonel Blotto Game Approach
Abstract
Multi-access edge computing (MEC) has been recently considered in
challenging environments lacking available terrestrial infrastructures
by extending the computing resources to the air for further enhancing
the computation capability of the new aerial user equipment (AUE).
Additionally, wireless power transfer (WPT) is a promising solution to
prolong the battery lifetime of energy-constrained wireless devices like
AUEs. In this paper, we investigate the integration of laser-beamed WPT
in the high-altitude platform (HAP) aided MEC systems for the
HAP-connected AUEs. By discretizing the three-dimensional coverage space
of the HAP, we present a multi-tier tile grid-based spatial structure to
provide aerial locations for laser charging. With this setup, we
identify a new privacy vulnerability caused by the openness during the
air-to-air transmission of WPT signaling messages in the presence of a
terrestrial adversary. A privacy-aware laser-powered aerial MEC
framework is developed that addresses this vulnerability and enhances
the location privacy of AUEs for laser WPT. Specifically, the
interaction between the HAP as a defender and the adversary in their
tile grid allocation as charging locations to AUEs is formulated as a
Colonel Blotto game, which models the competition of the players for
limited resources over multiple battlefields for a finite time horizon.
Moreover, we derive the mixed-strategy Nash equilibria of the tile grid
allocation game for both symmetric and asymmetric tile grids between the
defender and the adversary. Simulations results show that the proposed
framework significantly outperforms the design baselines with a given
privacy protection level in terms of system-wide expected total
utilities.