The Journal of China Universities of Posts and Telecommunications ›› 2022, Vol. 29 ›› Issue (3): 81-91.doi: 10.19682/j.cnki.1005-8885.2022.1002

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Secrecy Energy Efficiency Maximization for UAV-Enabled Multi-Hop Mobile Relay System


  1. Beijing Laboratory of Advanced Information Networks, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2021-02-27 Revised:2021-07-08 Online:2022-06-30 Published:2022-06-30
  • Contact: Miao Jiansong
  • Supported by:
    This work was supported by the Natural Science Foundation of Beijing Municipality (19L2045)


To deal with the secrecy issues and energy efficiency issues in the unmanned aerial vehicles ( UAVs) assisted communication systems, an UAV-enabled multi-hop mobile relay system is studied in an urban environment. Multiple rotary-wing UAVs with energy budget considerations are employed as relays to forward confidential information between two ground nodes in the presence of multiple passive eavesdroppers. The system secrecy energy efficiency ( SEE), defined by the ratio of minimum achievable secrecy rate ( SR) to total propulsion energy consumption (PEC), is maximized via jointly optimizing the trajectory and transmit power of each UAV relay. To solve the formulated non-convex fractional optimization problem subject to mobility, transmit power and information-causality constraints, an effective iterative algorithm is proposed by applying the updated-rate-assisted block coordinate decent method, successive convex approximation (SCA) technique and Dinkelbach method. Simulation

results demonstrate the effectiveness of the proposed joint trajectory design and power control scheme.

Key words: secrecy transmission, unmanned aerial vehicle (UAV), trajectory optimization, mobile relay