Research On MEC-based Network Handover And Speed Advisory Technologies For Vehicular Heterogeneous Networks

With the continuous development of wireless communication technology,the Internet of Vehicles is evolving towards the trend of heterogeneity.Heterogeneous vehicular networks integrate different communication technologies such as short-distance communication and cellular network to meet the needs of vehicular applications in different scenarios.In the face of the complex network topology and harsh communication conditions,ensuring the stability of network connection when driving and using Io V-assisted technology to improve the safety of vehicles are the current academic research hotspots.Most of the early heterogeneous vehicular networks rely on remote cloud servers to analyze and make decisions on massive data.Due to the long transmission diatance,delay-sensitive data is difficult to be processed in real time.The adoption of multi-access edge computing technology can push computing resources from the remote cloud to the MEC server at the edge of network,providing low latency data processing capability.Aiming at the problems of network connection and driving safety in heterogeneous vehicular networks,two kinds of MEC-based schemes were proposed.One for network handover,and the other for area speed advisory.The combination to of MEC and Io V communication technology is of great significance.On the one hand,considering the frequent network handover of vehicles,MEC has the ability to provide network selection process and improve the stability of network connection.On the other hand,MEC can provide for drivers with dynamic driving suggestions and improve driving safety through real-time analysis of road condition information.The main work and innovation points of this paper are as follows:Firstly,in the research background of V2 N communication between vehicles and cellular infrastructures in heterogeneous vehicular networks,a MEC-based network handover scheme for LTE and 5GRAN-level heterogeneous cellular networks is proposed.In the process of collecting handover information,traffic status,user priority and network status are taken into account.MEC technology is used to make handover decision.The network handover is completed through the signaling interaction between the vehicle and the base station.The handover decision involves candidate network throughput evaluation,Qo S boundary transformation,vehicle resident state estimation and hierarchical analysis process.The proposed handover scheme can solve the problem of insufficient mobility analysis in the traditional handover mechanism,reduce the unnecessary handover times and greatly improve the stability of the network connection.Secondly,aiming at V2 I communication between vehicles and road side units in heterogeneous vehicle networks based on IEEE 802.11 p short-range communication mode,a MEC-based dynamic speed advisory scheme is proposed.The scheme follows the European Telecommunications Standards Institute Standards for Io V.In addition,Cooperative Awareness service and Decomposed Environmental Notification service are used to exchange information between vehicles and RSUs.The dynamic area speed advisory is established by MEC on key roads(e.g.,Dense traffic flow areas and intersections)to reduce the number of collisions and improved the safety of vehicles.Finally,through the bidirectional coupling between the communication simulator NS3 and the traffic simulator SUMO,simulation scenario of Io V is built.Most notably,the simulation scenario is based on a real network deployment at the Shougang Industrial Park,which will host the 2022 Winter Olympic Games in Beijing.The MEC-based network handover scheme and dynamic speed advisory scheme are implemented in the simulation scene.In addition,the functional modules and algorithms mentioned in the scheme are tested.According to the analysis of the test results,the functional integrity and performance advantages of the proposed schemes compared with the traditional schemes are verified.