Software Defined Access Management And Optimization Method For Heterogeneous Internet Of Vehicles

As a key technology in Intelligent Transportation System?ITS?,Vehicle Ad-Hoc Network?VANET?enables wireless communication to ensure vehicle safety and provide vehicular entertainment applications through vehicle to vehicle communication and vehicle to infrastructure communication.With the large-scale deployment of ultra-dense VANET in the future and the growing demand for vehicle networking communication services,VANET will face the following problems:First,due to the rapid increase of large-scale mobile vehicle users,the cellular technology,which is widely used in VANET,will face the severe problem of network overload.At the same time,it is difficult to satisfy the network communication requirements of high-quality ITS services.Secondly,in the area of network control,the traditional VANET communication architecture relies on cellular base stations to implement vehicle control and data forwarding.Data and control center are coupled together,which makes the networking less flexible and efficient.Therefore,in this thesis,a software defined access management and optimization method for heterogeneous vehicles network is designed to provide an innovative solution for vehicle communication network access management.We will improve the problem of single network overload by setting up a heterogeneous vehicle networking network model.Meanwhile,we separate the data plane from the control plane through the software-defined network?SDN?architecture,which can realize flexible network control,improve the efficiency of network,and ensure the vehicle communication services.The main contents in the thesis are summarized as follows:1.A software defined vehicle communication network management model is established.SDN controller is used to control the mode of vehicle access network?i.e.,base station forwarding,device to device?D2D?and dedicated short range communication?DSRC??.The network access management model based on SDN consists of data plane and control plane.The data plane is responsible for collecting vehicle status and network information.According to the collected vehicle information,the control plane deduces the key performance indicators of vehicle communication network through reverse power control mechanism,including transmission rate,interference,transmission delay and energy loss.The specific process is as follows:first,we determine the received power threshold₀ and the maximum distance between alternative vehicles by the mechanism of channel directed power control.Then,we theoretically derive the transmission power,interference,signal to interference plus noise ratio?SINR?interruption probability,vehicle transmission rate and transmission delay.Through the experimental simulation,we can get the influence of different vehicle access scheme,SINR threshold and other parameters on the two key performance indicators of SINR outage probability and vehicle transmission rate.2.A software defined access management optimization method for heterogeneous internet of vehicles is designed.According to the performance indicators,the access mode of the vehicle can be optimized on the control plane,so that the network service quality of the vehicle heterogeneous network can be optimized according to the demand of the required services.At last,the optimized access network mode selection results are sent to each vehicle on the data plane.The specific optimization method is as follows:we first construct the benefit function required by the evolutionary game.Then to maximize the benefit function through the evolutionary game method,we can manage the access network mode of vehicles.This optimization management method can select the access mode of vehicle flexibly based on different demand of services,so that the network service quality of vehicle heterogeneous network can be optimized according to the demand of the required services.Finally,we verify the feasibility of the optimization algorithm by MATLAB simulation.The simulation results show that,compared with the traditional single network architecture,the heterogeneous access management and optimization method defined in this thesis can flexibly manage the access network,effectively improve the performance of the network,and improve the quality of service of the vehicle communication network.