1 research outputs found
A Two-stage Game Framework to Secure Transmission in Two-Tier UAV Networks
The multi-UAV network is promising to extend conventional networks by
providing broader coverage and better reliability. Nevertheless, the broadcast
nature of wireless signals and the broader coverage expose multi-UAV
communications to the threats of passive eavesdroppers. Recent studies mainly
focus on securing a single legitimate link, or communications between a UAV and
multiple ground users in one/two-UAV-aided networks, while the physical layer
secrecy analysis for hierarchical multi-UAV networks is underexplored. In this
paper, we investigate a general two-tier UAV network consisting of multiple UAV
transmitters (UTs) and multiple UAV receivers (URs) in the presence of multiple
UAV eavesdroppers (UEs). To protect all legitimate UT-UR links against UEs at
the physical layer, we design a two-stage framework consisting of a UT-UR
association stage and a cooperative transmission stage. Specifically, we
formulate the secure transmission problem into a many-to-one matching game
followed by an overlapping coalition formation (OCF) game, taking into account
the limited capabilities and the throughput requirements of URs, as well as the
transmission power constraints of UTs. A matching algorithm and an OCF
algorithm are proposed to solve these two sequential games whose convergences
and stabilities are guaranteed theoretically. Simulation results show the
superiority of our algorithms and the effectiveness of our two-stage game
framework in the terms of secrecy performance.Comment: to be appear in IEEE Transactions on Vehicular Technolog