Quality Of Service Analysis In Wireless Network Under The Assist Of Unmanned Aerial Vehicle

In the future mobile communication system,the user's demand for mobile data,especially for mobile video,has dramatically increased.But in cache-enabled wireless network,the data traffic demand of the user on the coverage boundary cannot be satisfied well because of the fixed base station.The unmanned aerial vehicle(UAV),as a communication-enable device that can improve the network coverage and increase the network rate becomes a very good supplementary solution,and gradually receives extensive attention and research.At the same time,its probabilistic line-of-sight propagation model also brings different analysis characteristics than the research on traditional wireless network.On the other hand,because of the limited power supply of the UAV itself,some of the user device's cache and computational capabilities are also worth taking into consideration.Considering that the computing resources and power supply capacity of UAV and user equipments are relatively limited,based on the separation of the control plane and the data plane,the macro-base station is the control center,and the macro base station completes the control of the complex process of network communications,allivating the power consumption of UAV and user equipment.Based on the macro base station's control,we next analyze the impact of multiple drone deployment scenarios on user rates.Then we provide a multi-layer cache cooperative transmission model based on random caching model.Under the assist of UAV,we implement content cooperative transmission and cache cooperative transmission among the same layer and between different layers.At the same time,using the knowledge of random geometric theory and probability theory,we derived and analyzed the expressions of network service quality considering in both successive interference cancellation and non-interference scenarios under different transmission strategies.Besides,the optimal resource allocation theorem in multi-link joint transmission is given,which makes full use of the rate resources of each link and derives it to the general situation.Finally,we consider the optimal design of random cache on UAV under special circumstances using the Lagrange multiplier method based on the scheme of caching cooperative transmission between UAVs.The simulation results show that our proposed scheme is always the optimal design scheme compared with several reference schemes under various network factor.We finally generalize this result to the general situation.