Performance Analysis And NS-3 Simulation Evaluation Of A Hybrid Vehicular Networking Architecture

With the rapid development of the Intelligent Transportation System(ITS), vehicular networking has been widely studied in recent years. It uses a variety of wireless communication technologies to achieve Vehicle-to-Vehicle(V2V), Vehicle-to-Roadside(V2R) and Vehicle-to-Infrastructure(V2I) communications.The goal is to improve road safety and traffic efficiency and to provide passengers with more secure,comfortable and efficient in-vehicle information services.Firstly, from the type of vehicular networking applications, wireless communication technology and multi-mode communication interface three aspects of heterogeneous carried out a detailed analysis. For messages related to safety of life, we must ensure low latency and high reliability; for entertainment services not involving safety of life can have a certain delay tolerance, but its high bandwidth requirements.Currently, a single wireless communication technology cannot simultaneously satisfy the various application requirements. Datang Telcom Group, Huawei and other institutions are developing China's dedicated vehicular networking communication standard LTE-V, which uses semi-distributed and semi-centralized programs. LTE-V-Direct is used for V2 V, while LTE-V-Cell is used for V2 I.Then, diverse vehicular networking applications request the support of heterogeneous communication technology, combined with the existing vehicular networking wireless access technology,this paper presents a IEEE 802.11 p and LTE based hybrid networking framework, it includes roadside units,base stations, control centers and vehicles. Each vehicle is equipped with both IEEE802.11 p and LTE interfaces. For this architecture, we designed a heterogeneous network data distribution method for vehicles according to their geographical location, using different communication technologies to transmit messages.The IEEE802.11 p interface is used for V2 V and V2 R safety communications, while the LTE interface is used to provide entertainment services for vehicular users. The Proposed heterogeneous architecture coincided with the concept of LTE-V.Further consider implementing traffic flow model and network protocol IEEE802.11 p and LTE,in this paper, write XML scripts in traffic simulation tool VanetMobiSim, configure road topology model and vehicle movement, generating vehicle trajectory tracking documents. Preparation of networksimulation tool NS-3 in C++ simulation scripts, these tracks as node mobility model, set IEEE802.11 p and LTE protocols and the corresponding channel propagation loss model,and implement heterogeneous network data transmission.Finally, the paper use VanetMobiSim traffic simulation tool and NS-3 network simulation tool co-simulation, built hybrid vehicular networking architecture in the urban scene and highway scene,respectively. It evaluates performance metrics of the end-to-end average delay for safety messages, packets delivery ratio and throughput. The results show that the proposed IEEE802.11p-LTE hybrid architecture in ensuring safety applications of low latency but also to meet the needs of non-safety applications. This research will help future vehicular networking more optimized architecture.