Networking Routing And Performance Analysis Research Of Uav Emergency Communication Networks

With the development of 5G and B5 G communication technologies,wireless communication networks need to satisfy users’ requirements of high-capacity and high-reliability.However,traditional cellular networks cannot provide reliable networks access,especially in emergency scenarios.With the improvement of UAV load capacity and endurance,UAV can carry communication equipments as a mobile aerial base station to improve communication capacity in disaster area and hotspot area.Although it is significance to utilize UAV swarms in emergency communications,the frequent topology changes and complex flight trajectories of UAV swarms make it difficult to directly use traditional routing protocols and analyze system-level performance.Hence,it is urgent to optimize the UAV swarm routing protocol and system-level performance analysis.Therefore,combined with the UAV swarm routing optimization and stochastic geometry theory,this paper focuses on the research of UAV swarm routing optimization and system-level performance analysis.The main work and researches are summarized as follows:(1)Research of UAV swarm routing optimization based on topology.First,with the consideration of the distribution of UAV,flight trajectories and the relationship between UAV speed and energy consumption in energy-constrained scenarios,the model of this paper has been constructed.In addition,in order to improve the performance of the optimized link state protocol(Optimized Link State Routing,OLSR)in the UAV swarm system,this paper optimizes the message mechanism based on its topology,which makes it flexible to perceive the topology changes.Also,this paper provides the corresponding HELLO message format and sending rules.In the simulation experiment,this paper compares and analyzes the performance and overhead of different routing protocols based on Qualnet.The simulation results verify the effectiveness of the above routing protocols and improve the network performance of UAV swarm.(2)Research of the performance analysis of UAV communication networks based on stochastic geometry theory.First,based on the above research of routing protocols,this paper fully considers the air-to-ground channel model and the channel fading characteristics under line-of-sight and non-line-of-sight to construct the downlink communication model of the UAV emergency communication networks.With the consideration of the complexity of Markov motion model,this paper proposes a tractable performance analysis framework for the UAV communication systems,which is suitable for actual deployment conditions.This framework combines three-dimensional Brownian motion,deterministic motion,and stationary models,which dramatically removes the limitations and complexities.In addition,this paper analyzes the spectral efficiency and outage probability based on stochastic geometry theory,and obtains the upper and lower bounds of the performance.Finally,the simulation based on Monte Carlo algorithm verifies the reliability and feasibility of the performance analysis framework,which provides a reference for network operators to optimize network architecture and UAV emergency communication networks at scale.