无人机无线网络覆盖与切换性能分析

Analysis of UAV wireless network coverage and handover performance

针对无人机高移动性、飞行高度可控及视距信道概率高等使无人机无线网络的设计与部署存在多方面的挑战,且其组网性能是业界的焦点难点问题,分析了异构无人机无线网络的网络覆盖与切换性能,为无人机无线组网提供理论支撑。具体地,考虑无人机移动性导致的信道状态信息过时问题,基于随机几何理论,推导了异构无人机无线网络的切换概率、切换误差概率和覆盖概率的解析表达式,探究了无人机移动性、飞行高度和地面基站密度对上述性能的影响。研究表明,过时信道状态信息会造成切换误差,且随无人机移动速度和基站密度提升呈先增大后减小趋势。同时,无人机飞行高度比移动速度对覆盖概率的影响更加显著。

For the characteristics of unmanned aerial vehicle(UAV),such as high mobility,adjustable height,and high probability of line-of-sight channels,which introduced multiple challenges to the design and deployment of current and future wireless network,and the networking performance of UAV was the focus and difficult issues in the industry,the network coverage and handoff performance of heterogeneous UAV wireless network was analyzed,which provided insights into UAV wireless networking.Specifically,considering the outdated channel state information introduced by the UAV’s mobility,analytical expressions of handover probability,handover error probability,and coverage probability for heterogeneous UAV wireless network were derived by utilizing the tools from stochastic geometry.In addition,the impacts of the UAV’s mobility,height,as well as the density of terrestrial base stations on the aforementioned performance metrics were investigated.It shows that the outdated channel state information caused handover error,which increases first and then decreases with the increase of UAV’s moving speed and density of base stations.Meanwhile,the impact of UAV’s flight height on coverage probability is more significant than that of moving speed.