Research On Resource Allocation Of Communication Link For Heterogeneousvanet Based On Vlc And LTE-D2D

With the rapid development of the automotive industry,vehicles have gradually become intelligent terminals that provide intelligent driving and information services,real-time,high-speed data interaction with the outside world through the Internet of Vehicle(Io V).However,due to the imbalance in the growth of the number of vehicles with traffic condition and the development of vehicle networking technology.When the current Internet of Vehicle technology is applied to the vehicle to vehicle(V2V)scenario,the shortage of communication spectrum resources is caused by the high density of vehicles,causing collision of data packets,which leads to communication congestion and affects the overall network of the vehicle network performance,especially the transmission of safety information in the Internet of vehicles.In order to solve the above problems,with the continuous development of mobile communication technology,LTE-D2 D technology is applied to V2 V scenes.This thesis uses LTE-D2 D technology as the basic communication means between vehicles,combined with the vehicle's own lighting system,using the vehicle's LED lights and equipped with a visible light receiver to realize visible light communication(VLC)between vehicles,and a fusion communication scheme based on LTE-D2 D and VLC is proposed.The LTE-D2 D adopts an underlay mode to realize communication by multiplexing the spectrum resources of the cellular uplink user.When the cellular uplink user and the vehicle's LTE-D2 D interfere,the system replaces the original LTE-D2 D link by using the VLC as a secondary link for inter-vehicle communication to reduce interference within the system and improve overall performance.This thesis firstly models and simulates the LTE-D2 D inter-vehicle communication system and VLC communication system in the urban road environment.For the LTE-D2 D inter-vehicle communication system,the interference between the cellular uplink user and the vehicle user is analyzed.The relationship between the inter-vehicle communication scenario throughput of LTE-D2 D and the distance between vehicles and the number of vehicles in the system is simulated and analyzed.For the VLC system,the DC gain of the visible light communication channel on the urban road is analyzed.The throughput and the BER of the VLC communication between the distance and the number of vehicles in the system is simulated and analyzed.Then,this thesis designs the LTE-D2 D and VLC fusion communication schemes in the case of single base station and multi-base station respectively.For the single base station and multi-base station,due to the fluctuation of system capacity occurs due to the motion of the vehicle,a geographical location information based distributed link threshold control algorithm(GLIB-DLTCA)and a vehicle driving state based cross cellular maintenance algorithm(VDSB-CCMA)to enhance system stability.At the end of the thesis,the LTE-D2 D and VLC fusion communication schemes of single base station and multi-base station in the urban scenario are simulated respectively to testify system performance.At the same time,two algorithms for enhancing the stability of the system are verified by simulation.The simulation results show that the proposed fusion communication scheme and algorithm scheme can achieve better design results.The GLIB-DLTCA and VDSB-CCMA algorithms can improve the overall performance of the system to a certain extent,optimize the spectrum resource allocation results,improve the system throughput,and meet the needs of transmitting high-time traffic safety information of the vehicle network.