Secure task offloading strategy optimization of UAV-aided outdoor mobile high-definition live streaming^☆

Unmanned aerial vehicles (UAVs) bring more innovation and attraction to outdoor mobile high-definition (HD) live streaming with its unique perspective. Due to the heavy computational requirements of HD live broadcast tasks and the limited hardware performance of UAV equipment, how to reduce the system response delay and improve the energy efficiency of terminal equipment directly affects the secure broadcast of the system. Secure task offloading in this scenario is considered a promising solution and has received academic attention. In this paper, we simulate the UAV-aided outdoor mobile HD live streaming scenarios and optimize the relevant task offloading strategies. First, we design the total cost function of task offloading that jointly optimizes secure time latency and energy consumption. Additionally, we propose a collaborative computing model for multi-UAV task offloading. This model combines the idea of simulated annealing (SA) and introduces the compression factor to enhance the particle swarm optimization (PSO) to realize secure task offloading. The simulation results show that the proposed strategy has better performance in balancing network latency and energy consumption. Compared with the discrete teaching–learning-based optimization (DTLBO) and quantum PSO (QPSO) task offloading strategies, the fitness value of the proposed strategy is decreased by an average of 26.73% and 16.42%, respectively.