Abstract
Vehicular Ad hoc Network (VANET) is a special subset of multi-hop Mobile Ad hoc Networks in which vehicles can not only communicate with each other but also with the fixed equipments along the roads through wireless interfaces. Recently, it has been discovered that essential systems in real world share similar properties. When they are regarded as networks, among which the dynamic topology structure of VANET system is an important issue. Many real world networks are actually growing with preferential attachment like Internet, transportation system and telephone network. Those phenomena have brought great possibility in finding a strategy to calibrate and control the topology parameters which can help find VANET topology change regulation to relieve traffic jam, prevent traffic accident and improve traffic safety. VANET is a typical complex network which has its basic characteristics. In this paper, we focus on the macroscopic Vehicle-to-Infrastructure (V2I) and Vehicle-to-Vehicle (V2V) inter-vehicle communication network with complex network theory. In particular, this paper is the first one to propose a method analyzing the topological structure and performance of VANET and present the communications in VANET from a new perspective. Accordingly, we propose degree distribution, clustering coefficient and the short path length of complex network to implement our strategy by numerical example and simulation. All the results demonstrate that VANET shows small world network features and is characterized by a truncated scale-free degree distribution with power-law degree distribution. The average path length of the network is simulated numerically, which indicates that the network shows small-world property and is rarely affected by the randomness. What’s more, we carry out extensive simulations of information propagation and mathematically prove the power law property when γ > 2. The results of this study provide useful information for VANET optimization from a macroscopic perspective.
Highlights
As an important part of ITS, Vehicular Ad-hoc Network (VANET) has recently raised much attention to improve traffic safety, relieve traffic jam and provide abundant on-board infotainment services such as 3G access
All the results demonstrate that Vehicular Ad hoc Network (VANET) shows small world network features and is characterized by a truncated scale-free degree distribution with power-law degree distribution
Vehicular mobility dynamic characteristics including high speed, predictable, restricted mobility pattern significantly affect the performance of routing protocols in real VANET, which raises the research of dynamical topology
Summary
As an important part of ITS, Vehicular Ad-hoc Network (VANET) has recently raised much attention to improve traffic safety, relieve traffic jam and provide abundant on-board infotainment services such as 3G access. Connected vehicle focuses on localized Vehicle-to-Vehicle, Vehicle-to-Infrastructure and Vehicle-to-Device Systems (V2I, see Fig. 1.) to support safety, mobility and environmental applications using vehicle DSRC or Wireless Access for Vehicular Environments (WAVE). VANET is based on WIFI, and is the core set of standards to support cooperative, safety-critical V2X applications. Such applications include Forward Collision Warning, Intersection Collision Warning, and many other vehicle safety services. VANET is flexible enough to support mobility and environmental applications, such as tolling, traffic, commercial vehicle credentialing and a host of new and existing services. VANET is important transportation infrastructure which urban economic and social activities rely on They help improve traffic by investigating the performance of VANET and presenting innovation and optimization approaches based on the following analysis
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