Performances Research And Analysis Of Future Ultra-dense 3D Network Based On Stochastic Geometey

In recent years,the explosive growth of data traffic and the massive connections of intelligent devices have caused fourth generation mobile communication network(4G)failing to meet the needs of users for high-rate and low-latency networks,based on this,the fifth generation mobile communication network(5G)come into being.In 5G system,the Ultra Dense Network(UDN)is proposed as one of important solutions to meet the booming demand for high data rates and low latency,however,the interference and energy consumption have become serious problems owing to the large-scale deployment of small base stations.In addition,with the development of wireless technology,the evolution trend of future mobile network is extending from two dimensional planar to Three Dimensional(3D)space.As a result,it is of high significance to reasonably model the future 3D UDN network and improve the network performances by appropriate techniques.In this paper,the future network is modeled by using tools from 3D stochastic geometry,where the distributions of small base stations and users are modeled as independent homogeneous Poisson Point Processes(PPP).Then based on the modeled 3D network,different strategies such as base station sleeping,coordinated transmission and interference cancellation techniques are adopted to analyze network performances,such coverage probability,energy efficiency,date rate and etc.The first part is "performances research and analysis for 3D dense indoor scenario".This part put forward a new model for 3D indoor scenario,where the penetration loss is related to the distance between the two walls.Based on this model,coverage probability expression is firstly derived.Subsequently,the network energy efficiency expressions with random sleep mode and strategic sleep mode are derived respectively.Finally,simulation results confirm the accuracy of our analysis.To mitigate the interference and optimize network performances,the second part studies the energy efficiency based on strategic sleep mode with coordinated multi-point transmission in 3D dense urban scenarios.Firstly,coverage probability and energy efficiency expressions are derived,simultaneously,the relationship is analyzed between the base station density and the energy efficiency,and the optimal base station density is also obtained.Furthermore,the accuracy of the theoretical analysis is verified by the simulation results.In the third part,the critical performance of Virtual Reality(VR)is analyzed by using the tool of stochastic geometry in 3D urban scenario with densely deployed low-power nodes.To mitigate the severe interference for these densely deployed small base stations,a two-stage cooperative transmission scheme is proposed.In addition,the expressions of the average VR data rate and the latency probability based on the proposed scheme are derived.Numerical results are further conducted to evaluate the advantage of the proposed scheme and verify the accuracy of the theoretical analysis.